JP7238688B2 - Iron loss measurement method and iron loss measurement system - Google Patents

Description

TECHNICAL FIELD The present invention relates to an iron loss measuring method and iron loss measuring system, and is particularly suitable for use in measuring the iron loss of a coiled soft magnetic plate.

The evaluation of a soft magnetic plate typified by an electromagnetic steel plate is determined by its iron loss. As a method for measuring such iron loss, there is a method using a single plate tester as disclosed in Patent Document 1 and Non-Patent Document 1. In such a method, a sample of a specified size is cut out from a part of the manufactured coiled electromagnetic steel sheet, flattened, the flattened sample is set in a single plate tester, and the sample is excited to obtain an electric signal. to measure iron loss. In this method, samples must be cut from the manufactured electrical steel sheet. For this reason, it is not easy to perform the measurement efficiently because it is necessary to cut out the sample, and the sample is required, which causes material loss. In addition, in order to measure the overall core loss of the coiled magnetic steel sheet, it is necessary to collect samples at many positions on the coiled magnetic steel sheet. In such a case, the burden of cutting out the sample and the loss of material are further increased. Therefore, it is not realistic to employ such a method when measuring the overall iron loss of a coiled electrical steel sheet.

As a method for evaluating the overall core loss of a coiled electrical steel sheet, there is a method disclosed in Patent Document 2. In the method described in Patent Document 2, a coiled electromagnetic steel sheet is passed through an iron loss measuring device (measuring coil) while being unwound. At this time, an AC current is passed through the measuring coil to excite the magnetic steel sheet, and at the same time, a detection coil detects the magnetic field generated in the magnetic steel sheet, thereby continuously measuring the iron loss of the magnetic steel sheet. Then, the magnetic steel sheet after the iron loss measurement is wound again into a coil shape. This method can evaluate the difference in core loss at each position in the longitudinal direction of the coiled electromagnetic steel sheet. However, in this method, when measuring the iron loss of a coiled electromagnetic steel sheet, a device is required for pulling out the magnetic steel sheet from the coil and rewinding the pulled-out magnetic steel sheet. For this reason, it becomes a large-scale facility. Also, the measurement is performed while unwinding the coiled magnetic steel sheet. The total length of a coiled electromagnetic steel sheet may be 10 km or more, and a long measurement time is required to measure the iron loss of a coiled electromagnetic steel sheet with a long total length.

Moreover, there is a method disclosed in Patent Document 3 as a method for evaluating the entire coiled electrical steel sheet at once. In the method described in Patent Document 3, a winding for electrical measurement is wound around a coiled electromagnetic steel sheet. Specifically, for a coiled electromagnetic steel sheet, the winding is coiled so as to pass through the route of the outer peripheral surface → one end surface in the axial direction → the inner peripheral surface → the other end surface in the axial direction → the outer peripheral surface → . winding while moving in the circumferential direction of the electromagnetic steel sheet. However, unlike the method described in Patent Document 2, this method cannot evaluate the difference in iron loss at each position in the longitudinal direction of the coiled electromagnetic steel sheet.

Also, as a method for measuring magnetic flux in a local area of an electrical steel sheet, there is a probe method disclosed in Non-Patent Document 2 and Patent Documents 4 and 5. In this method, a probe is placed at each of two arbitrary points on the plate surface of an electromagnetic steel plate that is excited by an alternating current to obtain electrical continuity with the magnetic steel plate. The potential difference between these two points is measured and the magnetic flux value is obtained using the law of electromagnetic induction. However, although this method can measure magnetic flux density, it cannot measure core loss characteristics. In addition, since the probe is placed on the surface of the magnetic steel sheet, when evaluating the difference in iron loss at each position in the longitudinal direction of the coiled magnetic steel sheet, Except) As in Patent Document 2, the measurement must be performed while unwinding the coiled magnetic steel sheet. Therefore, it has the same problem as Patent Document 2. In particular, in the methods described in Patent Documents 4 and 5, it is necessary to bring the magnetic measurement sensor into contact with the surface of the magnetic steel sheet, so the equipment becomes much larger.

JP 2010-236882 A JP-A-4-9685 US Pat. No. 8,977,511 (US8,977,511 B2) JP 2011-27475 A JP 2015-87374 A

JIS C 2556 (2015), "Method for measuring iron loss of electrical steel strip using a veneer tester" Toshinao Yamaguchi, 6 others, "Theoretical Evaluation of Local Magnetic Flux Measurement Accuracy by Probe Method", Transactions of the Institute of Electrical Engineers of Japan A, 1995, Vol.115, No.1, pp.50-57

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and is capable of measuring the difference in iron loss depending on the position in the longitudinal direction of a coiled soft magnetic plate without unwinding the soft magnetic plate. The purpose is to

The iron loss measuring method of the present invention is a method for measuring the iron loss of a coil formed by winding a soft magnetic plate into a coil while the coil is in the state of being coiled. At the position of the first end face, which is one end face of the end faces in the plate width direction of the soft magnetic plate of the shape, at the position on the outer peripheral side and the inner peripheral side of the coil, respectively, The position of the second end face, which is the other end face of the end faces in the plate width direction of the coil-shaped soft magnetic plate, where the first electrode and the second electrode are brought into contact with each other, A third electrode and a fourth electrode are brought into contact with the position on the outer peripheral side and the position on the inner peripheral side, respectively. and the coil, wherein the first electrode and the second electrode are input terminals, and the third electrode and the fourth electrode are electrically connected AC power is supplied to the input terminal, AC voltage is applied between the first electrode and the second electrode, and AC current flows through the circuit. and an iron loss derivation step of deriving the iron loss of the measurement area of the coil, wherein the measurement area of the coil includes the first electrode, the second electrode, the third electrode, and the It is determined by the contact position of the fourth electrode with the soft magnetic plate, and the positions of the first electrode and the third electrode in the radial direction and the circumferential direction of the coil are substantially the same. The positions of the second electrode and the fourth electrode in the radial direction and the circumferential direction of the coil are substantially the same .

An iron loss measurement system of the present invention is an iron loss measurement system that measures the iron loss of a coil formed by winding a soft magnetic plate into a coil while the coil is in the state of the coil. At the position of the first end face, which is one of the end faces of the soft magnetic plate in the plate width direction, the position of the relatively outer peripheral side and the inner peripheral side of the coil, respectively. The position of the first electrode, the second electrode, and the second end face, which is the other end face of the end faces in the plate width direction of the coil-shaped soft magnetic plate, and the position of the coil relative to the A third electrode, a fourth electrode, the first electrode, the second electrode, the third electrode, the third electrode, and the third electrode, the fourth electrode, the first electrode, the second electrode, the third electrode, the third electrode, and the third electrode, the fourth electrode, and the first electrode, the second electrode, the third electrode, the third electrode, and the third electrode and the fourth electrode, which are in contact with the positions on the outer peripheral side and the inner peripheral side, respectively. 4 electrodes and the coil, wherein the first electrode and the second electrode are input terminals, and the third electrode and the fourth electrode are electrically connected. AC power supply means for supplying AC power to the circuit connected to the coil, AC voltage applied between the first electrode and the second electrode, and AC current flowing in the circuit are used to power the coil. and iron loss derivation means for deriving iron loss in the measurement area, wherein the measurement area of the coil is the first electrode, the second electrode, the third electrode, and the fourth electrode. It is determined by the contact position with the soft magnetic plate, the positions of the first electrode and the third electrode in the radial direction and the circumferential direction of the coil are substantially the same, and the second electrode and the The position of the fourth electrode in the radial direction and the circumferential direction of the coil is substantially the same .

ADVANTAGE OF THE INVENTION According to this invention, the difference of the core loss by the position of the longitudinal direction of a coil-shaped soft-magnetic material board can be measured, without unwinding a soft-magnetic material board.

1 is a diagram showing a first example of the configuration of an iron loss measurement system; FIG. FIG. 4 is a diagram conceptually showing a first example of a coil viewed obliquely; FIG. 10 is a diagram conceptually showing an example of a state of a region in the vicinity of positions where electrodes are arranged in a cross-sectional region of a coil; FIG. 10 is a diagram showing a first example of electrode positions assuming that the coil is unwound; 4 is a flowchart illustrating an example of a method of measuring iron loss; FIG. 4 is a diagram conceptually showing an example of a current flowing through a coil; FIG. 4 is a diagram showing a second example of the configuration of the iron loss measurement system; FIG. 6 is a diagram conceptually showing a second example of a state in which the coil is seen obliquely; FIG. 4 is a diagram conceptually showing an example of the relationship between the radius of curvature of a coil and the iron loss deterioration rate; FIG. 4 is a diagram conceptually showing an example of the flow of magnetic flux generated in a coil; FIG. 4 is a diagram conceptually showing a first example of how the first end face and the second end face of the coil are viewed (from the front). FIG. 4 is a diagram conceptually showing a first example of a cross section when the coil is cut along the radial direction of the coil so as to pass through the axis of the coil; FIG. 4 is a diagram conceptually showing an example of a region where a first end surface of an electrode and a first end surface of a coil are in contact; FIG. 10 is a diagram showing a second example of electrode positions assuming that the coil is unwound; FIG. 10 is a diagram conceptually showing a second example of how the first end face and the second end face of the coil are viewed (from the front). FIG. 4 is a diagram conceptually explaining an example of the arrangement of electrodes and backup portions when the first end surface and the second end surface of the coil are viewed (from the front). FIG. 6 is a diagram conceptually showing a second example of a cross section when the coil is cut along the radial direction of the coil so as to pass through the axis of the coil; FIG. 3 is a diagram conceptually showing an example of a state of a first end face of a coil (from the front). FIG. 18B is a sectional view taken along line II of FIG. 18A; FIG. 18B is a cross-sectional view taken along the line II-II of FIG. 18A. FIG. 10 is a diagram conceptually showing an example of a state in which the second end surface of the coil is viewed (from the front). FIG. 19B is a sectional view taken along line II of FIG. 19A; FIG. 19B is a cross-sectional view along II-II in FIG. 19A.

An embodiment of the present invention will be described below with reference to the drawings. In the following embodiments, an example will be described in which the iron loss of a coiled magnetic steel sheet is measured as the iron loss of a coiled soft magnetic plate. A coil-shaped soft magnetic plate (electromagnetic steel plate) is abbreviated as a coil as needed.

(First embodiment)
First, the first embodiment will be explained.
FIG. 1 is a diagram showing an example of the configuration of an iron loss measurement system.
In FIG. 1, the iron loss measurement system has a DC power supply 10, an AC power supply 20, a switch 30, an ammeter 40, a voltmeter 50, a wattmeter 60, electrodes 70a, 70a'70b, 70b', and an arithmetic unit 80. .
A DC power supply 10 outputs DC power. AC power supply 20 outputs AC power.
The changeover switch 30 selects either the DC power output from the DC power supply 10 or the AC power output from the AC power supply 20 and outputs it to the coil C side.

Ammeter 40 measures the DC current output from DC power supply 10 and the AC current output from AC power supply 20 . Thus, the ammeter 40 can measure both direct current and alternating current (that is, it is an ammeter for both AC and DC). In this embodiment, the ammeter 40 measures the current (direct current and alternating current) flowing between the changeover switch 30 (the direct current power supply 10 and the alternating current power supply 20) and the electrode 70a. Also, the ammeter 40 used is one capable of measuring at least the effective value when measuring the alternating current.
The voltmeter 50 is arranged between the electrodes 70a and 70a′ (between the electrode 70a and the ground), and measures the DC voltage applied between the electrodes 70a and 70a′ by the DC power supply 10 and the electrodes 70a and 70a′ by the AC power supply 20. Measure the AC voltage applied across 70a'. Thus, the voltmeter 50 can measure both DC voltage and AC voltage (that is, it is a voltmeter for both AC and DC). In addition, the voltmeter 50 uses a voltmeter capable of measuring at least an average value when measuring the AC voltage. As will be described later, the effective value of the AC voltage may be measured by the voltmeter 50 when deriving the Joule loss. In this case, as the voltmeter 50, one that can switch between the measurement of the average value and the measurement of the effective value is used.

The wattmeter 60 derives power (effective power) based on the AC voltage applied between the electrodes 70 a and 70 a ′ by the AC current output from the AC power supply 20 and the AC current output from the AC power supply 20 . As shown in FIG. 1, in the present embodiment, the power meter 60 uses an AC current flowing between the AC power source 20 and the electrode 70a and an AC voltage between the electrodes 70a and 70a' (the potential of the electrode 70a and the ground potential). potential difference).

2 to 4 are diagrams for explaining an example of connection points between the electrodes 70a, 70a', 70b, 70b' and the coil C. FIG.
FIG. 2 is a diagram conceptually showing an example of a state in which the coil C is seen obliquely. FIG. 2(a) shows the electrode 70a on the end face on the side where the electrodes 70a and 70a' are arranged, among the end faces in the plate width direction of the electromagnetic steel sheet forming the coil C (the end faces in the direction along the axis O of the coil C). , 70a′. FIG. 2(b) shows the electrode 70b on the end face on the side where the electrodes 70b and 70b' are arranged, among the end faces in the plate width direction of the electromagnetic steel sheet constituting the coil C (the end faces in the direction along the axis O of the coil C). , 70b′. The coil C is obtained by winding an electromagnetic steel sheet into a coil. Therefore, the end face in the plate width direction of the electromagnetic steel sheet forming the coil C (the end face in the direction along the axis O of the coil C) has a spiral shape. For convenience of notation, the spiral shape is omitted. In addition, in FIGS. 2A and 2B, the iron loss measurement area is shown in gray (actually, it is not color-coded as in FIG. 2).

FIG. 3 shows that electrodes 70a, 70a', 70b, 70b' are arranged in the area of the cross section of the coil C obtained by cutting the coil C along the radial direction of the coil C so as to pass through the axis O of the coil C. FIG. 10 is a diagram conceptually showing an example of a state of an area near a position where a light is applied; In FIG. 3, the area of the magnetic steel sheet is indicated by a thick line. As described above, the coil C is obtained by coiling an electromagnetic steel sheet. Therefore, a large gap is not formed between the magnetic steel sheets adjacent to each other in the radial direction of the coil C (vertical direction in FIG. 3), but in FIG. like it is.

FIG. 4 is a diagram showing an example of the positions of the electrodes 70a, 70a', 70b, 70b' assuming that the coil C is unwound. In FIG. 4, the iron loss measurement area is shown in gray (actually, it is not color-coded as in FIG. 4). The area shown in gray in FIG. 2 indicates the area of the end face in the sheet width direction of the electromagnetic steel sheet that constitutes the coil C, among the iron loss measurement areas. The area shown in gray in FIG. 4 indicates the plate surface area of the electromagnetic steel sheet forming the coil C in the iron loss measurement area.

As shown in FIGS. 2(a), 2(b), 3, and 4, in this embodiment, the electrodes 70a, 70a', 70b, 70b' have a needle-like portion (needle shape). In order to prevent the electrodes 70a, 70a' 70b, 70b' from coming into contact with the electromagnetic steel sheets over a plurality of layers, the diameters of the tips of the electrodes 70a, 70a' 70b, 70b' It is preferably smaller than the plate thickness.

As shown in FIGS. 2A, 3, and 4, the electrode 70a is in contact with one of the widthwise end surfaces of the electromagnetic steel sheet forming the coil C (electrically connected). In the following description, of the end faces in the plate width direction of the electromagnetic steel sheet forming the coil C, the end face on the side in contact with the electrode 70a is referred to as the first end face of the coil C, and the plate of the electromagnetic steel plate forming the coil C is referred to as the first end face of the coil C. Of the end faces in the width direction, the end face on the side opposite to the end face is referred to as the second end face of the coil C as necessary.

As shown in FIGS. 2(a), 3, and 4, the electrode 70a′ contacts a position on the inner peripheral side of the first end surface of the coil C with respect to the position where the electrode 70a contacts ( electrically connected).
As shown in FIGS. 2(b), 3, and 4, the electrode 70b is in contact (electrically connected) to one point on the second end face of the coil C. As shown in FIG. As shown in FIGS. 2(b), 3, and 4, the electrode 70b' is brought into contact (electrically is done).

As described above, the areas indicated by gray in FIGS. 2(a), 2(b), and 4 are iron loss measurement areas. That is, among the regions of the electromagnetic steel sheet forming the coil C, the plane shape of the iron loss measurement region is a square region with the electrodes 70a, 70a', 70b, and 70b' as vertices. Therefore, the positions at which the electrodes 70a, 70a', 70b, and 70b' are brought into contact with the electromagnetic steel sheets forming the coil C are determined according to the iron loss measurement region.
1 to 4, the contact points of the electrodes 70a, 70a', 70b, and 70b' with the end faces of the electromagnetic steel sheets in the plate width direction are denoted by a, a', b, and b', respectively.

As shown in FIG. 4, the positions of the electrode 70a (contact point a) and the electrode 70b (contact point b) in the radial direction (direction of the winding thickness of the electromagnetic steel sheet) and circumferential direction (direction in which the electromagnetic steel sheet is wound) of the coil C are The closer the two, the better, the more preferably they are approximately the same, and the most preferably they are the same. The closer the positions of the electrode 70a' (contact a') and the electrode 70b' (contact b') in the radial direction (the winding thickness direction of the electromagnetic steel sheet) and the circumferential direction (the direction in which the electromagnetic steel sheet is wound) of the coil C, the closer. It is more preferable that they are approximately the same, and most preferably they are the same (since it is not easy to make them exactly the same in practice, it is sufficient if they are approximately the same). In this way, as shown in FIG. 4, in the same manner as in the general iron loss measurement method described in Non-Patent Document 1 and the like, a rectangular (or square) shape having two sides facing each other along the rolling direction can be obtained. This is because a region (having a shape close to the shape) can be used as the measurement region. Here, the fact that the positions of the coils C in the radial direction (the winding thickness direction of the electromagnetic steel sheets) are the same means that the layers of the electromagnetic steel sheets forming the coils C are the same.

In the present embodiment, as described above, the positions of the electrode 70a (contact a), the electrode 70b (contact b), the electrode 70a' (contact a'), and the electrode 70b' (contact b') are determined, Electrodes 70a, 70b, 70a', and 70b' are fixed in position. Thus, in the present embodiment, by positioning the electrodes 70a, 70b, 70a', and 70b', the iron loss measurement region of the coil C can be changed without unwinding the coil C. .

The method of positioning the electrodes 70a, 70a', 70b, and 70b' is not particularly limited, and includes, for example, the following method. First, the imaging device is arranged at a position where the coil C is within the angle of view with the first end surface and the second end surface of the coil C positioned on the left and right. Then, the coil C is imaged in a state in which the electrodes 70a, 70a', 70b, and 70b' attached to the positioning mechanism are in contact with the first end surface and the second end surface of the coil C. FIG. The positioning mechanism, for example, can slide the electrodes attached in an electrically insulated state in the height direction, and can fix the electrodes at arbitrary positions in the height direction. Further, for example, the electrodes 70a and 70a' are attached to the same positioning mechanism, and the electrodes 70b and 70b' are attached to the same positioning mechanism different from the positioning mechanism.

Image processing is performed on the image captured by the imaging device to search for the positions of the electrodes 70a, 70a', 70b, and 70b'. Information indicating the positions of the electrodes 70a, 70a', 70b, and 70b' is then displayed on the computer display. While viewing this display, the inspector moves the electrodes 70a, 70a', 70b, and 70b' so that the electrodes 70a, 70a', 70b, and 70b' reach desired positions (iron loss position corresponding to the measurement area). When the examiner determines that the electrodes 70a, 70a', 70b, and 70b' are at the desired positions, the examiner fixes the electrodes 70a, 70a', 70b, and 70b' at the desired positions. .
The inspector may visually position the electrodes 70a, 70a', 70b, and 70b'.

Returning to the description of FIG. 1 , electrode 70 a is electrically connected to voltmeter 50 and wattmeter 60 . The electrode 70a' is connected to the ground terminal. Also, the electrodes 70b and 70b' are short-circuited.
Here, an insulating coating is formed on (the surface of) the surface of the electromagnetic steel sheet that constitutes the coil C. As shown in FIG. Since the insulating coating is non-conductive, the electrical resistance of the coil C in the radial direction is much higher than that of the electrical steel sheet. Therefore, the path through which the current flows is the electrode 70a, the contact a, the coil C, the contact b, the electrode 70b, the electrode 70b', the contact b', the coil C, the contact a', and the electrode 70a'. An excitation current path of turns is formed. As described above, since the radial electrical resistance of the coil C is much higher than the electrical resistance of the magnetic steel sheet, the magnetic flux generated by the excitation current path is distributed between the electrodes 70a and 70a' Between them, it flows in the circumferential direction of the coil C (the direction perpendicular to the paper surface in FIG. 3 and the direction of the double arrow line (virtual line) shown in FIG. 4 in FIG. 4). Therefore, the iron loss measurement area is the area shown in gray in FIGS.

In FIG. 1, when the DC power output from the DC power supply 10 is selected by the changeover switch 30, the changeover switch 30, the ammeter 40, the power meter 60, the electrode 70a, the contact a, the coil C, A DC current flows through the path (closed circuit) returning to the DC power supply 10 via the contact b, the electrode 70b, the electrode 70b', the contact b', the coil C, the contact a', and the electrode 70a'. In the following description, this circuit through which direct current flows will be referred to as a first measurement circuit as required.

On the other hand, when the AC power output from the AC power supply 20 is selected by the changeover switch 30, the changeover switch 30, the ammeter 40, the power meter 60, the electrode 70a, the contact a, the coil C, the contact b , electrode 70b, electrode 70b′, contact b′, coil C, contact a′, electrode 70a′ and a path returning to AC power supply 20, and from AC power supply 20, electrode 70a′, contact a′, coil C, An alternating current flows through the path (closed circuit) returning to the alternating current power supply 20 via the contact b', the electrode 70b', the electrode 70b, the contact b, the coil C, the contact a, the electrode 70a, the power meter 60, the ammeter 40, and the changeover switch 30. flow. In the following description, this circuit through which alternating current flows will be referred to as a second measurement circuit as required.

Arithmetic device 80 gives operation instructions to DC power supply 10, AC power supply 20, and selector switch 30 arranged as described above, and inputs measured values of ammeter 40, voltmeter 50, and wattmeter 60. to derive the iron loss in the measurement area. Arithmetic device 80 can be realized, for example, by using an information processing device having a CPU, ROM, RAM, HDD, and various interfaces. An example of the functions of the computing device 80 will be described below. A part or all of the functions of the computing device 80 may be performed by the inspector. In FIG. 1, among the lines connecting each configuration, the dashed-dotted lines indicate information transmission paths within the arithmetic unit 80 and between the arithmetic unit 80 and the outside, and the solid lines indicate the information transmission paths from the DC power supply 10. A route (electric wire) through which the output direct current and the alternating current output from the alternating current power supply 20 flow is shown.

The control unit 81 instructs the DC power supply 10, the AC power supply 20, and the switch 30 to operate.
A wire is used as the path through which the alternating current flows in the second measuring circuit. The active power measured by the wattmeter 60 includes the DC resistance of the wire, the contact resistance between the electrodes 70a, 70a'70b, 70b' and the coil C, the electrodes 70a, 70a'70b, 70b' and the electromagnetic steel sheet. Measurement errors occur due to the electrical resistance they have.

Therefore, in the present embodiment, the DC resistance is measured in advance, and the value obtained by subtracting the Joule heat based on the DC current from the active power measured by the power meter 60 is calculated by the mass of the measurement area of the coil C. The divided value is derived as the core loss of the coil C in the measurement area.
Therefore, control unit 81 instructs selector switch 30 to select the DC power output from DC power supply 10 . As a result, the selector switch 30 switches so that the AC power supply 20 and the ammeter 40 are in a non-conducting state and the DC power supply 10 and the ammeter 40 are in a conducting state.

Then, the control unit 81 instructs the DC power supply 10 to supply a predetermined DC power. As a result, DC power is output from the DC power supply 10 to the first measurement circuit.
After the DC power is output from the DC power supply 10 to the first measuring circuit, the DC resistance deriving unit 82 converts the value of the DC voltage measured by the voltmeter 50 into the value of the DC current measured by the ammeter 40. is derived and stored as the DC resistance in the circuit having the electrodes 70a and 70a' as input terminals in FIG. The circuit having the electrodes 70a and 70a' as input terminals is a circuit configured using the electrodes 70a, 70a' 70b and 70b' and the coil C, and the electrodes 70b and 70b' are electrically connected. (shorted in FIG. 1).

Thereafter, control unit 81 instructs DC power supply 10 to stop outputting DC power. Then, the control unit 81 instructs the switch 30 to select the AC power output from the AC power supply 20 . As a result, the changeover switch 30 switches so that the DC power supply 10 and the ammeter 40 are in a non-conducting state and the AC power supply 20 and the ammeter 40 are in a conducting state.

After that, the control unit 81 instructs the AC power supply 20 to output a predetermined AC power. As a result, AC power is output from the AC power supply 20 to the second measurement circuit.
After the AC power is output from the AC power supply 20 to the second measurement circuit, the AC input adjustment unit 83 adjusts the AC power supply so that the average value and frequency of the AC voltage measured by the voltmeter 50 are the target values. Adjust the value of the AC voltage output from 20 . The target values are the cross-sectional area of the measurement area of the iron core (in the example shown in FIGS. 1 and 2, the area of a square with the points of contact a, a′, b, and b′ as vertices) and the magnetic flux density, which is the measurement condition of the iron core. is used to derive the voltage between the electrodes 70a and 70a' corresponding to the magnetic flux density according to the law of electromagnetic induction.

After the average value and frequency of the AC voltage output from the AC power supply 20 are adjusted to the target values by the AC input adjustment unit 83, the iron loss derivation unit 84 calculates the AC power (active power) measured by the power meter 60. , the value of the alternating current measured by the ammeter 40, the DC resistance derived in advance by the DC resistance deriving unit 82, and the mass of the measurement region of the coil C, the measurement region of the coil C to derive the iron loss of The mass of the measurement area of the coil C is derived, for example, as follows. That is, using the distance (that is, the radius) of the electrodes 70a, 70a′, 70b, and 70b′ from the center of the coil C and the coil width, the volume of the measurement area of the coil C is obtained, and the volume and the density of the electromagnetic steel sheet are calculated. can be derived as the mass of the measurement area of coil C. Alternatively, the product of the area of the square with the electrodes 70a, 70a', 70b, and 70b' shown in FIG.

An example of a specific method of deriving the iron loss in the iron loss derivation unit 84 will be described. The product of the square of the effective value of the alternating current applied is derived as the Joule loss. A value obtained by dividing the square of the effective value of the AC voltage measured by the voltmeter 50 by the DC resistance may be derived as the Joule loss.
Then, the iron loss derivation unit 84 divides the value obtained by subtracting the Joule loss from the value of the AC power (active power) measured by the power meter 60 by the mass of the measurement area of the coil C, It is derived as the core loss of the area. After the iron loss in the measurement region of the coil C is thus derived, the control unit 81 instructs the AC power supply 20 to stop supplying AC power.

The output unit 85 outputs information on the iron loss of the measurement region of the coil C derived by the iron loss deriving unit 84 . At least one of display on a computer display, storage in a storage medium inside or outside the computing device 80, and transmission to an external device can be employed as the form of output, for example.

Next, an example of the iron loss measuring method of this embodiment will be described with reference to the flowchart of FIG.
First, in step S501, the DC power supply 10, the AC power supply 20, the switch 30, the ammeter 40, the voltmeter 50, the wattmeter 60, the electrodes 70a, 70a', 70b, 70b', and the arithmetic device 80 are shown in FIG. Arrange as shown and configure the circuit such that the first measurement circuit and the second measurement circuit are configured. At least part of the configuration of this circuit may be done manually.

Next, in step S502, after the DC power is output from the DC power supply 10 to the first measurement circuit based on the instruction from the control unit 81, the DC resistance derivation unit 82 is measured by the voltmeter 50. A value obtained by dividing the value of the DC voltage by the value of the DC current measured by the ammeter 40 is derived and stored as the DC resistance in the circuit having the electrodes 70a and 70a' as input terminals.

Next, in step S503, when the output of the DC power from the DC power supply 10 is stopped based on the instruction from the control unit 81 and the AC power is output from the AC power supply 20, the AC input adjustment unit 83 detects the voltmeter The value of the AC voltage output from the AC power supply 20 is adjusted so that the average value and frequency of the AC voltage measured at 50 are the target values.

Next, in step S504, the iron loss deriving unit 84 derives the product of the direct current resistance derived in step S502 and the square of the effective value of the alternating current measured by the ammeter 40 as Joule loss.
Next, in step S505, the iron loss deriving unit 84 subtracts the joule loss derived in step S504 from the value of the AC power (active power) measured by the power meter 60, The value divided by the mass is derived as the iron loss of the measurement area of the coil C.
Next, in step S506, the output unit 85 outputs the iron loss information of the measurement region of the coil C derived in step S506.

As described above, in this embodiment, the electrodes 70a and 70a' are electrically connected (contacted) to the first end surface of the coil C, and the electrodes 70b and 70b' are electrically connected to the second end surface of the coil C. (contact), a circuit configured by using the electrodes 70a, 70a′, 70b, 70b′, and the coil C, the input terminal between the electrodes 70a, 70a′, the electrodes 70b and The electrodes 70b' form an electrically connected circuit. Then, the iron loss in the measurement region of the coil C is derived based on the alternating current flowing through the circuit and the alternating voltage between the electrodes 70a and 70a'. The iron loss measurement area in the coil C is determined by the positions of the electrodes 70a, 70a', 70b, 70b'. Therefore, by changing the positions of the electrodes 70a, 70a', 70b, and 70b', the iron loss at each position in the longitudinal direction of the electromagnetic steel sheets forming the coil C can be derived. Therefore, it is possible to measure the difference in iron loss depending on the position in the longitudinal direction of the electromagnetic steel sheets forming the coil C, without unwinding the electromagnetic steel sheets, and with a small-scale facility in a relatively short period of time.

In addition, in this embodiment, the DC resistance in the circuit described above is derived and stored before measuring the core loss. Then, a value obtained by subtracting the Joule loss based on the DC resistance from the active power based on the AC current flowing in the circuit and the AC voltage between the electrodes 70a and 70a' is derived as the iron loss in the measurement region of the coil C. . Therefore, the iron loss in the measurement area of the coil C can be derived with higher accuracy.
In addition, in the present embodiment, the positions of the electrode 70a (contact a) and the electrode 70b (contact b) in the radial direction and the circumferential direction of the coil C are substantially the same, and the electrode 70a' (contact a') and the electrode 70b The position of '(contact b') in the radial direction and the circumferential direction of the coil C is substantially the same. Therefore, the iron loss measurement area is limited as much as possible, the measurement area is clarified, and a rectangular (or square) area along the rolling direction can be used as the measurement area, as in a general iron loss measurement method. .

As described above, by subtracting the Joule loss from the active power (active power measured by the power meter 60) based on the alternating current flowing in the closed circuit and the alternating voltage between the electrodes 70a and 70a', the iron loss can be derived with higher accuracy. However, for example, when the DC resistance of the circuit is small, it is not necessary to derive the Joule loss.

Further, the positions of the electrode 70a (contact a) and the electrode 70b (contact b) in the radial direction and the circumferential direction of the coil C are substantially the same, and the electrode 70a' (contact a') and the electrode 70b' (contact b') ), if the positions of the coil C in the radial direction and the circumferential direction are set to be substantially the same, a rectangular (or square) ( A region with a shape close to the shape can be used as the measurement region, which is preferable. However, this need not necessarily be the case. As described above, in FIG. 4, the iron loss measurement area is defined by the electrode 70a (contact a), the electrode 70a' (contact a'), the electrode 70b (contact b), and the electrode 70b' (contact b'). It becomes a rectangular area with Therefore, when the position of any one of electrode 70a (contact a), electrode 70a' (contact a'), electrode 70b (contact b), and electrode 70b' (contact b') changes, the position changes to is vertically displaced from the position shown in .

Further, in the present embodiment, the electrode 70a (contact a) and the electrode 70a' (contact a') are shared for voltage measurement and current measurement, and the voltage and current are measured by the two-terminal method as an example. explained. However, this need not necessarily be the case. For example, an electrode 70a (contact a) and an electrode 70a' (contact a') may be provided for voltage measurement and current measurement, respectively, and voltage and current may be measured by the four-probe method.
Further, it is preferable to use the ammeter 40 and the voltmeter 50 for both AC and DC because the configuration is simplified, but instead of the ammeter 40, both a DC ammeter and an AC ammeter may be used. , instead of the voltmeter 50, both a DC voltmeter and an AC voltmeter may be used. Also, the DC power supply 10 and the AC power supply 20 can be replaced with power supplies for both AC and DC.

In addition, in the present embodiment, the electrodes 70a, 70a', 70b, 70b' (contacts a, a', b, b') contact (electrically connect) only one layer (the same layer) of the electromagnetic steel sheet. I made it to be. However, the electrodes 70a, 70a', 70b, 70b' (contact points a, a', b, b') may be contacted (electrically connected) across a plurality of layers of magnetic steel sheets. In this case, the contacts that are in contact (electrically connected) across a plurality of layers are divided into a plurality of contacts (in FIG. 4, among the contacts a, a′, b, and b′, The contacts that are in contact (electrically connected) together become multiple contacts arranged in the vertical direction). For example, when the electrode contacts a total of three layers, that is, the layer of the contact a and the layers above and below the contact a, in FIG. . In this case, the distance between the contact a and the contact b is shorter than the distance between the contact at the upper and lower positions and the contact b. Therefore, the current flowing through the contact a and the contact b becomes larger than the current flowing between the contact and the contact b at the upper and lower positions. However, in FIG. 4, since there is also a contact at the position above the contact a, strictly speaking, the measurement area of the iron loss in the coil C is the contact at the position above the contact a, the contact a', It becomes a quadrangular area with b and b' as vertices. In addition, since a current also flows between the contacts located above and below and the contact b, a magnetic flux is also generated in a direction inclined with respect to the longitudinal direction of the coil C. As shown in FIG. For this reason, there is a possibility that the measurement accuracy of iron loss in the coil C may be lowered. Therefore, for simple measurement, the electrodes 70a, 70a', 70b, 70b' (contacts a, a', b, b') may be in contact across a plurality of layers. If it is necessary to clarify the measurement area of the core loss of the coil C and improve the measurement accuracy of the core loss of the coil C, electrodes 70a, 70a', 70b, 70b' (contacts a, a', b, b' ) contact only one layer (the same layer) of the electrical steel sheet.

(Second embodiment)
Next, a second embodiment will be described. FIG. 6 is a diagram conceptually showing an example of the current flowing through the coil C. As shown in FIG. Specifically, FIG. 6A is a diagram conceptually showing an example of a current path when it is assumed that the coil C is unwound. In FIG. 6A, the current path is indicated by a dashed line. FIG. 6(b) is a diagram conceptually showing an example of the direction of the current and the direction of the magnetic flux inside the electromagnetic steel sheet forming the coil C. As shown in FIG. In FIG. 6B, the dashed line indicates the direction of the magnetic flux when the current flows in the direction from the front side to the back side of the paper (this direction is indicated by the symbol with the x in the circle). A double arrow line in FIG. 6 indicates the width direction of the electromagnetic steel sheet.

As shown in FIG. 6A, the coil C is obtained by winding (winding) an electromagnetic steel sheet. Therefore, electrode 70a (contact a), electrode 70b (contact b), electrode 70a' (contact a'), and electrode 70b' (contact b') are conductive. Therefore, in addition to the current flowing between the electrode 70a (contact a) and the electrode 70b (contact b) and between the electrode 70a' (contact a') and the electrode 70b' (contact b'), the coil C The alternating current flowing in the circumferential direction (longitudinal direction of the electromagnetic steel sheet) (the alternating current flowing between the electrode 70a (contact a) and the electrode 70a' (contact a')) is used to measure the iron loss in the measurement area of the coil C. may affect

In this case, the Joule loss between the electrode 70a (contact a) and the electrode 70a' (contact a') is corrected as described in the first embodiment. However, the alternating current flowing between the electrode 70a (contact a) and the electrode 70a' (contact a') generates a magnetic field in the plane orthogonal to the longitudinal direction of the electromagnetic steel sheet, as shown in FIG. 6(b). iron loss is generated by the AC excitation. Evaluation of the iron loss of an electrical steel sheet is generally performed by exciting the electrical steel sheet in its longitudinal direction (rolling direction). Therefore, generating a magnetic field in a plane perpendicular to the longitudinal direction of the electromagnetic steel sheet causes an error in iron loss measurement. In particular, when the distance between the electrodes 70a and 70a' (between the contacts a and a') in the radial direction of the coil C is short, the electrical resistance between the electrodes 70a (contact a) and 70a' (contact a') increases. become smaller. Therefore, the alternating current flowing between them (that is, the magnetic field generated in the plane perpendicular to the longitudinal direction of the magnetic steel sheet) cannot be ignored, and there is a risk that the iron loss measurement error will become unignorable. be.

Therefore, in the present embodiment, the influence of the magnetic field generated in the plane perpendicular to the longitudinal direction of the magnetic steel sheet on the measurement of iron loss is reduced. As described above, the main difference between the present embodiment and the first embodiment is the configuration for reducing the influence. Therefore, in the description of the present embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals as those in FIGS. 1 to 5, and detailed description thereof is omitted.

The alternating current flowing in the circumferential direction of the coil C shown in FIGS. 6A and 6B flows, for example, from the electrode 70a (contact a) and flows in the coil C in the circumferential direction to the electrode 70a′ (contact outflow from a′). Therefore, the alternating current flowing in the circumferential direction of the coil C does not flow through the electrodes 70b (contact b) and 70b' (contact b') on the second end face side of the coil C (if it does, it will be negligible). small). That is, the alternating current flowing between the electrodes 70b and 70b' (between the contacts b and b') on the second end face side of the coil C contributes only to the magnetization of the coil C in the circumferential direction (longitudinal direction of the electromagnetic steel sheet). Therefore, when the iron loss is measured using the AC current, it is possible to avoid the measurement error of the iron loss due to the magnetic field generated in the plane perpendicular to the longitudinal direction of the magnetic steel sheet.

Therefore, in this embodiment, as shown in FIG. 7, the ammeter 40 measures the current (direct current and alternating current) flowing between the electrodes 70b and 70b' (between the contacts b and b'). On the other hand, in the first embodiment, the wires are short-circuited between the electrodes 70b and 70b' (between the contacts b and b').
The wattmeter 60 measures the alternating current flowing between the electrodes 70b and 70b' (between the contacts b and b') and the alternating voltage between the electrodes 70a and 70a' (potential difference between the potential of the electrode 70a and the ground potential). input.
As described above, the arrangement of the ammeter 40 and the wattmeter 60 is different between the present embodiment and the first embodiment. Others are the same as in the first embodiment.

As described above, in this embodiment, based on the alternating current flowing between the electrodes 70b and 70b' (between the contacts b and b') on the second end face side of the coil C and the alternating voltage between the electrodes 70a and 70a' to derive the core loss of the coil C in the measurement region. Therefore, it is possible to reduce the measurement error of the iron loss due to the magnetic field generated in the plane orthogonal to the longitudinal direction of the magnetic steel sheet described above, and to derive the iron loss in the measurement region of the coil C with higher accuracy. .
Also in this embodiment, various modifications described in the first embodiment can be adopted.

(Third embodiment)
Next, a third embodiment will be described. In the first and second embodiments, on the first end surface of the coil C, one electrode 70a is provided on the outer peripheral side and one electrode 70a' is provided on the inner peripheral side so that at least the positions of the coil C in the radial direction are different. In the second end face of the coil C, an electrode 70b is arranged on the outer peripheral side and an electrode 70b' is arranged on the inner peripheral side so that at least the radial positions of the coil C are different. explained.

As described above, the electrodes 70a, 70a', 70b, and 70b' are in contact with the end surfaces of the electromagnetic steel sheets in the sheet width direction. The end face of the electromagnetic steel sheet in the sheet width direction is thin (for example, the thickness of the electromagnetic steel sheet is 0.35 [mm]). Therefore, the contact resistance between the electrodes 70a, 70a', 70b, 70b' and the coil C may increase. Therefore, in the present embodiment, on each of the first end face and the second end face of the coil C, a plurality of electrodes are provided at the same position in the radial direction of the coil C with mutually different positions in the circumferential direction of the coil C. and connect the plurality of electrodes in parallel. By doing so, the iron loss of the coil C can be stably measured with higher accuracy. As described above, the main difference between the present embodiment and the first and second embodiments is the electrodes that are brought into contact with the coil C. As shown in FIG. Therefore, in the description of this embodiment, the same parts as those in the first and second embodiments are denoted by the same reference numerals as those in FIGS. 1 to 7, and detailed description thereof is omitted.

FIG. 8 is a diagram conceptually showing an example of a state in which the coil C is seen obliquely. 8(a) shows the arrangement of electrodes 71a, 72a, 73a, 71a', 72a', 73a' on the first end face of the coil C, and FIG. The arrangement of electrodes 71b, 72b, 73b, 71b', 72b', 73b' is shown.
In FIG. 8(a), the electrodes 71a, 72a, and 73a have the same position in the radial direction of the coil C (the layers of the electromagnetic steel sheets in contact are the same) and different positions in the circumferential direction of the coil C. , are contacted (electrically connected) to the first end faces of the coils C, respectively. The electrodes 71a', 72a', and 73a' are arranged so that the radial position of the coil C is on the inner peripheral side (inner peripheral layer) than the electrodes 71a, 72a, and 73a. The electrodes 71a′, 72a′, and 73a′ have the same position in the radial direction of the coil C (same contact layers of the electrical steel sheets) as the electrodes 71a, 72a, and 73a. The first end surfaces of the coils C are contacted (electrically connected) so that the positions in the circumferential direction are different.

The positions of the electrodes 71a and 71a′ in the circumferential direction of the coil C, the positions of the electrodes 72a and 72a′ in the circumferential direction of the coil C, and the positions of the electrodes 73a and 73a′ in the circumferential direction of the coil C are closer to each other. It is preferable that they are as close as possible, more preferably substantially the same, and most preferably the same (since it is not easy to make them exactly the same in practice, it is sufficient if they are substantially the same). Similarly, the positions of the electrodes 71b and 71b′ in the circumferential direction of the coil C, the positions of the electrodes 72b and 72b′ in the circumferential direction of the coil C, and the positions of the electrodes 73b and 73b′ in the circumferential direction of the coil C are It is preferable that they are close to each other, more preferably substantially the same, and most preferably the same (since it is not easy to make them exactly the same in practice, it is sufficient if they are substantially the same).

In addition, the positions of the electrodes 71a and 71b in the radial direction of the coil C (the winding thickness direction of the electromagnetic steel sheet) and the circumferential direction (the direction in which the electromagnetic steel sheet is wound) are preferably closer, and are more preferably substantially the same. Preferably, they are most preferably the same (since it is not easy to make them exactly the same in practice, it is sufficient if they are approximately the same). The closer the positions of the electrodes 71a' and 71b' in the radial direction of the coil C (the winding thickness direction of the electromagnetic steel sheet) and the circumferential direction (the direction in which the electromagnetic steel sheet is wound), the better, and they are preferably substantially the same. Preferably, they are most preferably the same (since it is not easy to make them exactly the same in practice, it is sufficient if they are approximately the same). The positions of the electrodes 72a and 72b in the radial direction of the coil C (the winding thickness direction of the electromagnetic steel sheet) and the circumferential direction (the direction in which the electromagnetic steel sheet is wound) are preferably closer, more preferably substantially the same. It is most preferable that they are the same. The closer the positions of the electrodes 72a' and 72b' in the radial direction of the coil C (the winding thickness direction of the electromagnetic steel sheet) and the circumferential direction (the direction in which the electromagnetic steel sheet is wound), the better, and they are preferably substantially the same. Preferably, they are most preferably the same (since it is not easy to make them exactly the same in practice, it is sufficient if they are approximately the same). The positions of the electrodes 73a and 73b in the radial direction of the coil C (the winding thickness direction of the electromagnetic steel sheet) and in the circumferential direction (the direction in which the electromagnetic steel sheet is wound) are preferably closer, more preferably substantially the same. It is most preferable that they are the same. The closer the positions of the electrodes 73a' and 73b' in the radial direction of the coil C (the winding thickness direction of the electromagnetic steel sheet) and the circumferential direction (the direction in which the electromagnetic steel sheet is wound), the better, and they are preferably substantially the same. Preferably, they are most preferably the same (since it is not easy to make them exactly the same in practice, it is sufficient if they are approximately the same).

As described above, in the same manner as the general iron loss measurement method described in Non-Patent Document 1, etc., a rectangular (or square) shape (a shape close to the shape) having two sides facing each other along the rolling direction can be obtained. ) area can be the measurement area.
Then, as shown in FIG. 8(a), the ends of the electrodes 71a, 72a, 73a which are not in contact with the coil C are electrically connected to each other by electric wires. The ends of the electrodes 71a′, 72a′, 73a′ not in contact with the coil C, the ends of the electrodes 71b, 72b, 73b not in contact with the coil C, and the coils C of the electrodes 71b′, 72b′, 73b′ The non-contacting ends are also electrically connected to each other by wires. Positions P1, P2, P3 and P4 shown in FIGS. 8(a) and 8(b) correspond to positions P1, P2, P3 and P4 shown in FIGS. That is, the electrodes 71a, 72a, 73a, 71a', 72a', 73a', 71b, 72b, 73b, 71b', 72b', and 73b' are used as described above instead of the electrodes 70a, 70a', 70b, and 70b'. 8(a) and 8(b) and positions P1 and P2 shown in FIGS. , P3 and P4 are made to match.

As described above, in this embodiment, on each of the first end surface and the second end surface of the coil C, a plurality of coils C are arranged at the same position in the radial direction of the coil C, and the positions in the circumferential direction of the coil C are mutually different. The electrodes 71a-73a, 71a'-73a', 71b-73b, 71b'-73b are brought into contact with (electrically connected to) the coil C, and the plurality of electrodes 71a-73a, 71a'-73a', 71b-73b , 71b' to 73b are connected in parallel. By doing so, the contact resistance between the electrodes 71a-73a, 71a'-73a', 71b-73b, 71b'-73b and the coil C can be reduced. Further, even if one or two of the three electrodes 71a-73a, 71a'-73a', 71b-73b, 71b'-73b are defective, the iron loss of the coil C can be measured. Therefore, the iron loss of the coil C can be stably measured with higher accuracy.

In this embodiment, the number of the electrodes 71a to 73a, 71a' to 73a', 71b to 73b, and 71b' to 73b connected in parallel is three. The number of electrodes may be any number as long as it is two or more.
Moreover, this embodiment can be applied to both the first embodiment and the second embodiment. Also, in this embodiment, various modifications described in the first embodiment and the second embodiment can be adopted.

(Fourth embodiment)
Next, a fourth embodiment will be described. In the first to third embodiments, the value obtained by subtracting the Joule loss from the value of the AC power (active power) measured by the power meter 60 is divided by the mass of the measurement area of the coil C. The case of derivation as the iron loss in the measurement area of is described as an example. As described above, the coil C is obtained by winding an electromagnetic steel sheet. In the general iron loss measurement described in Non-Patent Document 1 and the like, the electrical steel sheet is kept flat. For this reason, the iron loss in the measurement area of the coil C (that is, the electromagnetic steel sheet as it is coiled) may differ from the iron loss measured with the measurement area in a flat state. Therefore, in the present embodiment, the iron loss in the measurement region of the coil C derived as in the first to third embodiments is corrected for the error due to the magnetic steel sheet being coiled. As described above, the present embodiment adds correction processing for iron loss in the measurement region of the coil C to the first to third embodiments. Therefore, in the description of this embodiment, the same parts as those in the first to third embodiments are denoted by the same reference numerals as those in FIGS. 1 to 8, and detailed description thereof is omitted.

In this embodiment, the relationship between the curvature radius of the coil C and the iron loss deterioration rate is investigated in advance for each type (steel type) of the electromagnetic steel sheet and each excitation condition. The excitation conditions include magnetic flux density and excitation frequency. The iron loss deterioration rate X is obtained, for example, by subtracting the measured value of the iron loss WF of (the sample of) the magnetic steel plate (the sample) that is flat from the measured value of the iron loss WR of (the sample of) the electromagnetic steel plate bent with a certain radius of curvature. (X={(WR−WF)/WF}×100) divided by the measured iron loss WF of the flat electrical steel sheet (expressed as a percentage). The fact that the iron loss deterioration rate X of an electromagnetic steel sheet bent with a certain curvature radius is 30 [%] means that the iron loss of an electromagnetic steel sheet bent with that curvature radius is equal to the iron loss of a flat electromagnetic steel sheet, It represents a value obtained by adding a value of 30% of the core loss of the flat electromagnetic steel sheet. The method for measuring iron loss here is not particularly limited. When measuring the iron loss of an electromagnetic steel sheet bent with a curvature radius, a yoke having a tip end surface with a curvature radius substantially the same as the curvature radius of the magnetic steel sheet may be used. FIG. 9 is a diagram conceptually showing an example of the relationship between the radius of curvature of the coil C and the iron loss deterioration rate.

Measurement of iron loss when a flat magnetic steel sheet (sample) of a certain steel type is excited under a certain excitation condition, Measurement of iron loss when excited under excitation conditions is performed by varying the curvature radius. As a result, the relationship between the radius of curvature of the coil C and the iron loss deterioration rate X for a certain steel type and certain excitation conditions is obtained. By deriving the relationship between the curvature radius of the coil C and the iron loss deterioration rate as described above by varying the steel type and the excitation condition, the curvature radius of the coil C and the iron loss deterioration rate X can be obtained. The relationship between the radius of curvature of the coil C and the iron loss deterioration rate X may be a formula representing the relationship, or a table in which the radius of curvature of the coil C and the iron loss deterioration rate X are associated with each other and stored. good. The iron loss deriving unit 84 obtains information indicating the relationship between the curvature radius of the coil C and the iron loss deterioration rate X for each type (steel type) of the electromagnetic steel sheet and each excitation condition, prior to the iron loss in the measurement region of the coil C. It is stored (before the flow chart of FIG. 5 starts). A form of obtaining such information includes, for example, reception from an external device, reading from a portable storage medium, and input operation by an operator, but is not particularly limited.

Prior to the iron loss in the measurement area of the coil C (before step S506 in FIG. 5), the inspector determines the type (steel type) of the electromagnetic steel sheet that constitutes the coil C to be measured, the excitation conditions, and the coil Information indicating the radius of curvature of C is input to the computing device 80 by operating the user interface of the computing device 80 . The iron loss deriving unit 84 reads the iron loss deterioration rate X corresponding to the information input to the arithmetic unit 80 from information stored in advance. Then, in step S505, the iron loss deriving unit 84 calculates the value obtained by subtracting the Joule loss derived in step S504 from the value of the AC power (active power) measured by the power meter 60 as the mass of the measurement region of the coil C. W′ [W/kg] is the value obtained by dividing by, W [W/kg] is the iron loss in the measurement area of the coil C, and X [%] is the readout iron loss deterioration rate, the following (1) The iron loss W in the measurement area of the coil C is derived by the formula.
W=W'×{1/(1+X/100)} (1)
Then, in step S506, the output unit 85 outputs the iron loss information of the measurement region of the coil C derived by the equation (1).

As described above, in this embodiment, the circuit is configured using the electrodes 70a, 70a′, 70b, 70b′, and the coil C, and the input terminal is between the electrodes 70a and 70a′, and the electrode 70b and the iron loss derived based on the AC current flowing in the circuit to which the electrodes 70b' are electrically connected and the AC voltage between the electrodes 70a and 70a' is corrected according to the curvature of the coil C. Therefore, the iron loss in the measurement area of the coil C can be derived with higher accuracy.

It is an index value of how much the iron loss changes compared to the case where the magnetic steel sheet has a curvature and is flat, and is an index value of the iron loss WR of the magnetic steel sheet bent with a certain curvature radius and the flat If the index value is determined using the iron loss WF of the electrical steel sheet, the iron loss deterioration rate X need not necessarily be determined as described above. For example, the iron loss deterioration rate X is obtained by subtracting the iron loss WR of the magnetic steel sheet bent with a certain curvature radius from the iron loss WF of the flat magnetic steel sheet, It may be a value (expressed as a percentage) divided by the loss WR (X={(WF−WR)/WR}×100). In this case, the iron loss W in the measurement region of the coil C is derived by the following equation (1)' instead of equation (1).
W=W'×(1+X/100) (1)'
Also, this embodiment can be applied to any of the first, second, and third embodiments. Moreover, also in this embodiment, various modifications described in the first embodiment, the second embodiment, and the third embodiment can be employed.

(Fifth embodiment)
Next, a fifth embodiment will be described. FIG. 10 shows that, as in the first to fourth embodiments, the electrode has a needle-like portion, and the tip of the needle-like portion is connected to the end face (first end face or second end face) of the coil C. FIG. 2 is a diagram conceptually showing an example of the flow of magnetic flux generated in a coil C when the coils are physically connected; FIG. 10(a) shows, as in the first embodiment, electrodes 70a and 70a' are arranged on the first end surface of the coil C one each on the outer peripheral side and the inner peripheral side, and the coil C 2, electrodes 70b and 70b' are arranged one each on the outer peripheral side and the inner peripheral side. FIG. 10(b) shows three electrodes 71a, 72a, 73a, 71a', 72a', and 73a on the first end surface of the coil C on the outer peripheral side and the inner peripheral side, respectively, as in the third embodiment. ' and three electrodes 71b, 72b, 73b, 71b', 72b', and 73b' are arranged on the second end surface of the coil C on the outer peripheral side and the inner peripheral side.

In FIGS. 10(a) and 10(b), the position of the symbol with an x in the circle and the position of the symbol with a circle in the circle indicate the positions of the electrodes. . In addition, a symbol with an X inside a circle indicates that the current flows in the direction from the front side to the back side of the paper. The position of the symbol with a ● inside a circle indicates that the current flows in the direction from the back side to the front side of the paper surface.
10(a) and 10(b), dashed lines 1011, 1012, 1013, and 1014 conceptually show an example of the flow of magnetic flux generated in the coil C by the current supplied from the electrodes.

As described with reference to FIGS. 2 to 4 and 8, in the examples shown in FIGS. 10(a) and 10(b), the iron loss measurement region in the coil C is the dashed-dotted line 1001 on the outer peripheral side, This is an area surrounded by 1003 and dashed-dotted lines 1002 and 1004 on the inner peripheral side (see the gray areas in FIGS. 2A, 2B, and 8). When the length of the iron loss measurement region in the coil C in the circumferential direction of the coil C is short (when the length of the iron loss measurement region in the coil C in the radial direction of the coil C is short, or when the coil C is configured When the plate thickness of the electromagnetic steel sheet is not thin), as described in the first embodiment, on the first end surface (second end surface) of the coil C, one each on the outer peripheral side and the inner peripheral side Even with the configuration in which the electrodes 70a, 70a' (70b, 70b') are arranged, the core loss measurement error of the coil C does not increase.

However, when the length of the iron loss measurement area in the coil C in the circumferential direction of the coil C is long (when the length of the iron loss measurement area in the coil C in the radial direction of the coil C is long, or when the coil C is When the plate thickness of the electromagnetic steel sheet constituting the coil C is thin), as shown in FIG. , 70a′ (70b, 70b′), the percentage of the magnetic flux that does not flow through the area surrounded by the dashed lines 1001 and 1002 increases.

That is, in the vicinity of the electrodes, the magnetic flux flowing in the circumferential direction of the coil C is in the region between the two electrodes whose positions in the circumferential direction are substantially the same (the symbol x in the circle in FIG. 10, It flows through the area between the symbol with ● in ○. However, the magnetic flux flowing in the circumferential direction of the coil C flows out of the area surrounded by the dashed-dotted lines 1001 and 1002 due to the effect of reducing the magnetic energy as the distance from the electrodes increases. Such a magnetic flux is a magnetic flux that flows in a region of the coil C that is different from the core loss measurement region. Therefore, a region different from the measurement region of the core loss in the coil C is excited, and the core loss of the region is also measured. Therefore, it can be a measurement error of iron loss. Such an iron loss measurement error increases as the length of the iron loss measurement region of the coil C in the circumferential direction of the coil C increases.

Therefore, as shown in FIG. 10(b), by arranging a plurality of electrodes (three electrodes in the example shown in FIG. 10(b)) at the same position in the radial direction of the coil C, the circumference of the coil C is reduced. Shorten the spacing of the electrodes in the direction. By doing so, the magnetic flux flowing outside the area surrounded by the dashed lines 1003 and 1004 can suppress the decrease in magnetic energy more than the magnetic flux staying in the area. Therefore, the proportion of the magnetic flux flowing in the area surrounded by the dashed lines 1003 and 1004 is greater than in the case shown in FIG. 10(a). Therefore, the iron loss measurement accuracy can be improved. In the third embodiment, when all of the electrodes 71a, 72a, 73a, 71a', 72a', 73a' are in contact with the coil C, such an effect is obtained.

However, even in the example shown in FIG. 10(b), the electrodes are arranged with intervals in the circumferential direction of the coil C. As shown in FIG. Therefore, in order to further increase the ratio of the magnetic flux within the area surrounded by the dashed-dotted lines 1003 and 1004, it is necessary to increase the number of electrodes arranged in the coil C in the circumferential direction. Although this may be done, a large number of electrodes must be brought into contact with the coil C. Therefore, in the present embodiment, the shape of the region of the tip of the electrode (region in contact with the first end surface and the second end surface (region electrically connected)) is adjusted to the shape of the first end surface and the second end surface of the coil C. The shape should be as close as possible to the spiral shape on the end face of the
As described above, the main difference between the present embodiment and the first to fourth embodiments is the electrodes that are brought into contact with the coil C. FIG. Therefore, in the description of this embodiment, the same parts as those in the first to fourth embodiments are denoted by the same reference numerals as those in FIGS. 1 to 9, and detailed description thereof is omitted.

FIG. 11 is a diagram conceptually showing an example of how the first end surface and the second end surface of the coil C are viewed (from the front). FIG. 11(a) is a diagram conceptually showing an example of a state (from the front) of the first end surface of the coil C, and FIG. 11(b) is a diagram showing the second end surface of the coil C ( It is a figure which shows notionally an example of the state seen from the front). FIG. 12 is a diagram conceptually showing an example of a cross section when the coil C is cut along the radial direction of the coil C so as to pass through the axis O of the coil C. As shown in FIG.

In FIGS. 11 and 12, electrodes 1100a, 1100a', 1100b, and 1100b' are of the same configuration and each have an annular coaxial portion. In this embodiment, the electrodes 1100a, 1100a', 1100b, and 1100b' are so-called annular electrodes, and are composed of annular coaxial portions. When the coaxial portions of the electrodes 1100a, 1100a', 1100b, and 1100b' are cut in a direction perpendicular to the axes of the coaxial portions, the cross-sectional shape is annular.
The electrodes 1100a, 1100a', 1100b, 1100b' are arranged so as to be substantially coaxial with the axis O of the coil C. As shown in FIG. In this way, the axes of the electrodes 1100a, 1100a', 1100b, and 1100b' and the axis O of the coil C substantially coincide.
The electrodes 1100a, 1100a', 1100b, 1100b' are arranged in place of the electrodes 70a, 70a', 70b, 70b', respectively.

One of the axial end faces (of the annular coaxial portion) of the electrode 1100a is in contact with (electrically connected to) the first end face of the coil C. As shown in FIG. One of the axial end faces (of the annular coaxial portion) of the electrode 1100a' is in contact with the first end face of the coil C at a position on the inner peripheral side of the contact position of the electrode 1100a. connected).

One of the axial end faces (of the annular coaxial portion) of the electrode 1100b is in contact with (electrically connected to) the second end face of the coil C. As shown in FIG. One of the axial end faces (of the annular coaxial portion) of the electrode 1100b′ is in contact with the second end face of the coil C at a position on the inner peripheral side of the contact position of the electrode 1100b (electrical power supply). connected).

In the following description, of the axial end faces (of the annular coaxial portion) of the electrode, the end face in contact with the first end face or the second end face of the coil C will be referred to as the second end face of the electrode as necessary. 1 end face or the first end face of the coaxial portion of the electrode.

The positions of the electrodes 1100a and 1100b in the radial direction of the coil C (the direction of the winding thickness of the electromagnetic steel sheet) are preferably as close as possible, more preferably approximately the same, and most preferably the same (actually Since it is not easy to make them exactly the same, it is sufficient if they are approximately the same.) The positions of the electrodes 1100a′ and 1100b′ in the radial direction of the coil C (the winding thickness direction of the electromagnetic steel sheet) are preferably closer, more preferably substantially the same, and most preferably the same (in practice). It is not easy to make them exactly the same, so it is sufficient if they are approximately the same).

FIG. 13 is a diagram conceptually showing an example of a region where the first end surface of the electrode 1100a and the first end surface of the coil C are in contact. FIG. 13A is a diagram showing a portion of the coil C and the electrode 1100a in a cross section of the coil C cut along the radial direction of the coil C so as to pass through the axis O of the coil C. FIG. FIG. 13(b) is a diagram showing the area of one round of the coil C and the area of the electrode 1100a in the area of the first end face of the coil C (from the front).
In addition, in FIG. 13(b), the coil C (an area for one round) is indicated by a solid line. Also, the region of the electrode 1100a is indicated by a dashed line (in the region of the electrode 1100a, the solid line and the dashed line overlap (the dashed line is hidden by the solid line) in the portion that overlaps with the coil C (the region for one round)).

FIG. 14 is a diagram showing an example of the positions of the electrodes 1100a, 1100a', 1100b, 1100b' assuming that the coil C is unwound. In FIG. 14, the iron loss measurement area is shown in gray (actually, it is not color-coded as in FIG. 14). FIG. 14 corresponds to FIG.
13(a), 13(b), and 14, an example of a region where the first end surface of the electrode 1100a and the first end surface of the coil C are brought into contact (electrically connected) is shown. explain.

The coil C is formed by winding an electromagnetic steel sheet into a coil shape (spiral shape). On the other hand, when the coaxial portion of the electrode 1100a is cut in the direction perpendicular to the axis of the coaxial portion, the shape of the cross section is circular. Therefore, as shown in FIGS. 13(a) and 13(b), the first end surface of the coaxial portion of the electrode 1100a should be completely aligned with the spiral shape of the electromagnetic steel plate on the first end surface of the coil C. can't. Therefore, when the first end surface of the coaxial portion of the electrode 1100a and the first end surface of the coil C are opposed to each other, the first end surface of the coaxial portion of the electrode 1100a is aligned with the spiral shape of the first end surface of the coil C. It should fit the shape as much as possible. At this time, as shown in FIG. It is preferable to make continuous contact (electrical connection) with at least part of the minute region.

Insulating coating is applied to the surface of the electromagnetic steel sheet. Therefore, the magnetic steel sheets adjacent to each other in the coil C are electrically insulated. When the thickness of the first end surface of the coaxial portion of the electrode 1100a (thickness of the ring) is small, the region of the first end surface of the coaxial portion of the electrode 1100a in the thickness direction of the first end surface of the coaxial portion of the electrode 1100a. may contact only the electrically insulated regions between the magnetic steel sheets adjacent to each other in the coil C. In such a case, the area where the electrode 1100a and the coil C are electrically connected becomes discontinuous in the circumferential direction of the coil C (in FIG. 14, the entire boundary line between the electrode 1100a and the coil C is electrically are not connected to the electrode 1100a and are electrically connected to the boundary line between the electrode 1100a and the coil C).

Therefore, it is preferable that the thickness of the first end surface of the coaxial portion of the electrode 1100a (thickness of the ring) is equal to or greater than the plate thickness of the electromagnetic steel sheet forming the coil C. This is because the first end surface of the coaxial portion of the electrode 1100a and the first end surface of the coil C can be electrically connected continuously in the circumferential direction of the coil C. If the thickness of the first end surface of the coaxial portion of the electrode 1100a (thickness of the ring) is set to be at least twice the plate thickness of the electromagnetic steel sheet forming the coil C, the electrode 1100a At least part of the first end surface of the coaxial portion of the coil C can be continuously contacted (electrically connected) with (all of) the spiral region of the first end surface of the coil C. be possible.
Also, the diameter of the coaxial portion of the electrode 1100a (diameter of the ring) may be determined according to the size of the core loss measurement region in the coil C. FIG. A plurality of electrodes 1100a having different diameters may be prepared, and the electrodes 1100a matching the size of the iron loss measurement region in the coil C may be selected and used.

The region where the first end surface of the electrode 1100a′ and the first end surface of the coil C are in contact is the region where the first end surface of the electrode 1100a and the first end surface of the coil C are in contact. In the description, the electrode 1100a should be replaced with the electrode 1100a'. In addition, in the region where the first end surfaces of the electrodes 1100b and 1100b' and the second end surface of the coil C are in contact, the first end surface of the electrode 1100a and the first end surface of the coil C are in contact In the description of the regions, electrodes 1100b and 1100b' may be substituted for electrode 1100a, and the second end face of coil C may be substituted for the first end face of coil C. FIG. Therefore, a detailed description of the region where the first end faces of the electrodes 1100a', 1100b, 1100b' are brought into contact with the first end face or the second end face of the coil C is omitted.

As described above, in the present embodiment, the electrodes 1100a, 1100a', 1100b, and 1100b' have annular coaxial portions, and the first end surfaces of the coaxial portions of the electrodes 1100a and 1100b are attached to the first end surface of the coil C. are electrically connected (contacted), and the second end face of the coil C is electrically connected (contacted) to the first end faces of the coaxial portions of the electrodes 1100a' and 1100b'. Therefore, it is possible to reduce (preferably eliminate) regions in the circumferential direction of the coil C where no current flows. Therefore, as shown in FIG. 10, magnetic flux can be prevented from leaking outward or inward in the radial direction of the coil C from the area where the electrodes are arranged (the area surrounded by the dashed line). Thus, regardless of the length of the iron loss measurement region in the coil C in the circumferential direction of the coil C, the iron loss measurement error in the measurement region can be reduced.

In the present embodiment, the coaxial portions of the electrodes 1100a, 1100a′, 1100b, and 1100b′ will be described by taking as an example a case where the cross-sectional shape of the coaxial portions when cut in a direction perpendicular to the axis of the coaxial portions is circular. bottom. However, when the coaxial portion of the electrode is cut in the direction perpendicular to the axis of the coaxial portion, the shape of the cross section is spiral or annular (typically C-shaped) with one part missing. good too. Also, the shape of the cross section of the coaxial portion of the electrode taken along the direction perpendicular to the axis of the coaxial portion may be a ring shape other than a circular ring shape. For example, the coaxial portion of the electrode is cut in a direction perpendicular to the axis of the coaxial portion so as to match the spiral shape of the first end surface and the second end surface of the coil C. It may be deformed from a ring (the circle of the torus may not be a perfect circle).

When the coaxial portion of the electrode is cut in a direction perpendicular to the axis of the coaxial portion and has a spiral cross section, the following is preferable. That is, when the first end surface of the coaxial portion of the electrode and the first end surface or the second end surface of the coil C face each other, the spiral winding direction of the first end surface of the coaxial portion of the electrode and the winding direction of the spiral on the first end surface and the second end surface of the coil C are preferably matched. Further, in at least one circumferential region of the coil C in the circumferential direction, the spiral region of the first end face of the coaxial portion of the electrode and the spiral region of the first end face and the second end face of the coil C It is preferred that they overlap each other. That is, the spiral region of the first end face of the coaxial portion of the electrode and the region corresponding to at least one round of the coil C in the circumferential direction of the spiral regions of the first end face and the second end face of the coil C It is preferable to make them approximately the same in shape and size.
In addition, when the shape of the cross section of the coaxial portion of the electrode when cut in the direction perpendicular to the axis of the coaxial portion is an annular shape with one part missing, the one end and the other end of the annular part missing one part are It is preferable that the distance between them is as short as possible.

The electrodes 1100a, 1100a', 1100b, and 1100b' of this embodiment can be applied not only to the first embodiment, but also to the second embodiment and the fourth embodiment.
Moreover, also in this embodiment, various modifications described in the first, second, and fourth embodiments can be employed.

(Sixth embodiment)
Next, a sixth embodiment will be described. When the first end faces of the coaxial portions of the electrodes 1100a, 1100a′, 1100b, 1100b′ are brought into contact with the first end face or the second end face of the coil C as in the fifth embodiment, the electrodes 1100a, 1100a ', 1100b, 1100b' and the first end face or the second end face of the coil C are in contact with each other.

The first end face and the second end face of the coil C are substantially flat if the width of the electromagnetic steel sheets forming the coil C is constant. However, the first end surface and the second end surface of the coil C may be curved due to twisting of the electromagnetic steel sheet when the electromagnetic steel sheet is wound. In such a case, there is a risk that the first end faces of the coaxial portions of the electrodes 1100a, 1100a′, 1100b, 1100b′ will not contact the first end face or the second end face of the coil C entirely. Then, the distribution of the current flowing through the coil C becomes uneven. Such non-uniform current distribution can cause iron loss measurement errors. Therefore, in this embodiment, the electrode (the coaxial portion thereof) is made to have elasticity so that the widest possible region of the first end surface of the coaxial portion of the electrode is the first end surface of the coil C or the second end surface. Make contact with the end face.
As described above, the main difference between the present embodiment and the fifth embodiment is that the coaxial portion of the electrode that contacts the coil C has elasticity. Therefore, in the description of this embodiment, the same parts as those in the first to fifth embodiments are denoted by the same reference numerals as in FIGS. 1 to 14, and detailed description thereof is omitted.

FIG. 15 is a diagram conceptually showing an example of how the first end surface and the second end surface of the coil C are viewed (from the front). FIG. 15(a) is a diagram conceptually showing an example of the appearance of the first end surface of the coil C (from the front), and FIG. 15(b) is a diagram showing the second end surface of the coil C ( It is a figure which shows notionally an example of the state seen from the front). FIG. 16 is a diagram conceptually explaining an example of the arrangement of the electrodes and the backup section when the first end surface and the second end surface of the coil C are viewed (from the front). In FIG. 16, the portion that can be seen through is indicated by a dashed line. FIG. 17 is a diagram conceptually showing an example of a cross section when the coil C is cut along the radial direction of the coil C so as to pass through the axis O of the coil C. As shown in FIG.

In FIGS. 16 and 17, electrodes 1500a, 1500a', 1500b, 1500b' are of the same configuration and each have an annular coaxial portion. The electrodes 1500a, 1500a', 1500b, 1500b' and the electrodes 1100a, 1100a', 1100b, 1100b' of the fifth embodiment differ only in material. That is, the electrodes 1500a, 1500a', 1500b, 1500b' and the electrodes 1100a, 1100a', 1100b, 1100b' have the same shape, size, and location.

The electrodes 1100a, 1100a', 1100b, 1100b' of the fifth embodiment have no elasticity. On the other hand, the electrodes 1500a, 1500a', 1500b, 1500b' of this embodiment have elasticity. The electrodes 1500a, 1500a', 1500b, and 1500b' are configured using conductive resin or conductive rubber, for example.
The first end faces of the coaxial portions of the electrodes 1500a, 1500a' are in contact with (electrically connected to) the first end face of the coil C in the same manner as the electrodes 1100a, 1100a'. The first end face of the coaxial portion of the electrodes 1500b, 1500b' contacts (is electrically connected to) the second end face of the coil C in the same manner as the electrodes 1100b, 1100b'.

In the following description, of the axial end faces of the coaxial portion of the electrode, the end face opposite to the first end face of the coaxial portion of the electrode will be referred to as the second end face of the electrode or the coaxial end face of the electrode as necessary. referred to as the second end face of the part.
15-17, the backup portion 1510a is connected to the second end surface of the coaxial portion of the electrodes 1500a, 1500a'. In this embodiment, the backup portion 1510a is non-detachably attached to the second end surfaces of the coaxial portions of the electrodes 1500a and 1500a'. However, it may be detachable. The backup portion 1510b is connected to the second end faces of the coaxial portions of the electrodes 1500b, 1500b'. In this embodiment, the backup portion 1510b is attached to the second end face of the coaxial portion of the electrodes 1500b and 1500b' in a non-detachable manner. However, it may be detachable.

In the example shown in FIGS. 15-17, the backup portions 1510a, 1510b have a hollow cylindrical shape. The backup portions 1510a, 1510b are arranged so as to be substantially coaxial with the axis O of the coil C and the axes of the electrodes 1500a, 1500a', 1500b, 1500b'. The backup portions 1510a and 1510b and the coaxial portions of the electrodes 1500a, 1500a', 1500b and 1500b' are connected using an adhesive, for example. In the following description, of the axial end surfaces of the backup portions 1510a and 1510b, the end surfaces connected to the electrodes 1500a, 1500a' and 1500b, 1500b' are referred to as first end surfaces of the backup portions 1510a and 1510b. In addition, of the end surfaces of the backup portions 1510a and 1510b in the axial direction, the end surfaces opposite to the end surfaces connected to the electrodes 1500a, 1500a', 1500b and 1500b' are designated as the second end surfaces of the backup portions 1510a and 1510b. called.

The elastic modulus of the electrodes 1500a, 1500a', 1500b, 1500b' is lower than that of the backup portions 1510a and 1510b. Therefore, the electrodes 1500a, 1500a', 1500b, 1500b' are more easily deformed than the backup portions 1510a and 1510b. When the electrodes 1500a, 1500a', 1500b, 1500b' are brought into contact with (electrically connected to) the first end surface and the second end surface of the coil C, the first end surface and the second end surface of the coil C Deformation of the electrodes 1500a, 1500a', 1500b, 1500b' according to the shape, prevention of deformation of the backup portions 1510a, 1510b, and prevention of misalignment of the electromagnetic steel sheets that constitute the coil C. and , are preferably configured to achieve the following. The backup portions 1510a and 1510b may be configured using a conductive material, or may be configured using an insulating material. When the backup portions 1510a and 1510b are conductive, for example, a conductive adhesive is applied so that the electrodes 1500a, 1500a′, 1500b, and 1500b′ and the backup portions 1510a and 1510b are electrically connected. are preferably used to connect the backup portions 1510a and 1510b and the coaxial portions of the electrodes 1500a, 1500a', 1500b and 1500b'.

The pressurizing mechanisms 1531a, 1532a, and 1533a have the same configuration and pressurize the second end surface of the backup portion 1510a in a direction substantially parallel to the axis O of the coil C. As shown in FIG. The pressurizing mechanisms 1531a, 1532a, 1533a and the backup portion 1510a are in contact with each other while being electrically insulated. The pressure from the pressure mechanisms 1531a, 1532a, and 1533a is distributed as evenly as possible to the backup portion 1510a, and the electrodes 1500a and 1500a′ are applied as much as possible while the electromagnetic steel sheets forming the coil C are not displaced. The positions and pressures of the pressure mechanisms 1531a, 1532a, and 1533a are preferably set so that a uniform force is applied to the . For example, the positions at which the pressure mechanisms 1531a, 1532a, and 1533a contact the second end face of the backup portion 1510a are preferably rotationally symmetrical positions about the axis of the backup portion 1510a. In the example shown in FIGS. 15 and 17, three pressure mechanisms 1531a, 1532a, 1533a are used. Therefore, the positions at which the pressure mechanisms 1531a, 1532a, and 1533a contact the second end surface of the backup portion 1510a are preferably three-fold symmetrical positions about the axis of the backup portion 1510a. In addition, the pressurizing forces of the pressurizing mechanisms 1531a, 1532a, and 1533a are preferably substantially the same, more preferably the same (since it is not easy to make them exactly the same in practice, it is should be fine). Incidentally, the pressurizing mechanisms 1531a, 1532a, and 1533a may be fixed to the backup portion 1510a.

In the description of the pressure mechanisms 1531a, 1532a, and 1533a above, the pressure mechanisms 1531a, 1532a, and 1533a, the backup section 1510a, and the electrodes 1500a and 1500a' are replaced with the pressure mechanisms 1531b, 1532b, and 1533b, respectively. , 1532b, 1533b, backup portion 1510b, and electrodes 1500b, 1500b'. Therefore, detailed description of the pressurizing mechanisms 1531b, 1532b, and 1533b is omitted. Also, since the pressurizing mechanisms 1531a, 1532a, 1533a, 1531b, 1532b, and 1533b themselves can be realized by known techniques, detailed description thereof will be omitted. The pressurizing mechanisms 1531a, 1532a, 1533a, 1531b, 1532b, and 1533b have the same configuration.

As described above, in this embodiment, the backup portions 1510a and 1510b having a higher elastic modulus than the electrodes 1500a, 1500a', 1500b and 1500b' are connected to the second end surfaces of the electrodes 1500a, 1500a', 1500b and 1500b'. . Using pressure mechanisms 1531a, 1532a, 1533a, 1531b, 1532b, 1533b, electrodes 1500a, 1500a', 1500b, 1500b' are applied to the first end surface and the second end surface of the coil C via backup portions 1510a, 1510b. Apply pressure to press against Therefore, the electrodes 1500a, 1500a' and 1500b, 1500b' can be deformed. Therefore, even if the first end surface and the second end surface of the coil C are curved surfaces, the first end surface of the coaxial portions of the electrodes 1500a, 1500a′, 1500b, 1500b′ should have as wide an area as possible (preferably the entire area). ) can be brought into contact with the first end surface and the second end surface of the coil C.
Also in this embodiment, various modifications described in the first, second, fourth, and fifth embodiments can be employed.

(Seventh embodiment)
Next, a seventh embodiment will be described. In the fifth and sixth embodiments, the case where the diameters (ring diameters) of the electrodes 1100a, 1100a', 1100b, 1100b', 1500a, 1500a', 1500b, and 1500b' are fixed has been described as an example. . In such a case, as described in the fifth embodiment, it is necessary to prepare a plurality of electrodes 1100a, 1100a', 1100b, 1100b', 1500a, 1500a', 1500b, 1500b' having different diameters. Therefore, in the present embodiment, the electrode is made flexible so that the diameter of the coaxial portion of the electrode can be changed. As described above, the main difference between the present embodiment and the fifth and sixth embodiments is the configuration based on the ability to change the diameter of the coaxial portion of the electrode. Therefore, in the description of the present embodiment, the same reference numerals as those in FIGS. 1 to 17 are assigned to the same parts as in the first to sixth embodiments, and detailed description thereof is omitted.

18A to 18C are diagrams showing an example of a configuration for making the diameter of the coaxial portion of the electrode arranged on the first end face side of the coil C and the electrode variable. FIG. 18A is a diagram conceptually showing an example of a state in which the first end surface of the coil C is viewed (from the front). FIG. 18B is a cross-sectional view taken along line II of FIG. 18A. FIG. 18C is a cross-sectional view along II-II of FIG. 18A. 19A to 19C are diagrams showing an example of a configuration for making the diameter of the coaxial portion of the electrode arranged on the second end face side of the coil C and the electrode variable. FIG. 19A is a diagram conceptually showing an example of a state in which the second end surface of the coil C is viewed (from the front). FIG. 19B is a cross-sectional view along II of FIG. 19A. FIG. 19C is a cross-sectional view along II-II of FIG. 19A.

In Figures 18A-18C and 19A-19C, electrodes 1800a, 1800a', 1800b, 1800b' are of the same configuration, each having a coaxial portion and a lead portion. The coaxial portions of the electrodes 1800a, 1800a', 1800b, 1800b' are arranged so as to be substantially coaxial with the axis O of the coil C. In this way, the axes of the electrodes 1800a, 1800a', 1800b, 1800b' and the axis O of the coil C substantially coincide. When the coaxial portions of the electrodes 1800a, 1800a', 1800b, and 1800b' are cut in a direction perpendicular to the axes of the coaxial portions, the cross-sectional shape is C-shaped.

The lead portions of the electrodes 1800a, 1800a′, 1800b, and 1800b′ are portions that are led out from one end and the other end of the C shape of the coaxial portion along the radial direction of the coil C toward the outer peripheral side of the coil C. . The shape of the cross section of the lead portions of the electrodes 1800a, 1800a', 1800b, 1800b' when cut in the direction perpendicular to the axis of the coaxial portion is an elongated rectangular shape with the radial direction of the coil C as the longitudinal direction. The drawing portions of the electrodes 1800a, 1800a', 1800b, and 1800b' are flat in shape. The coaxial and lead-out portions of the electrodes 1800a, 1800a', 1800b, 1800b' are integral (no boundaries).

The electrodes 1800a, 1800a', 1800b, 1800b' are flexible, and the diameters of the coaxial portions of the electrodes 1800a, 1800a', 1800b, 1800b' are variable. Therefore, when the diameters of the coaxial portions of the electrodes 1800a, 1800a', 1800b, and 1800b' are deformed, the regions that become the coaxial portions and the regions that become the lead portions change. That is, when the diameters of the coaxial portions of the electrodes 1800a, 1800a', 1800b, and 1800b' are deformed, regions that were coaxial portions before deformation may become lead portions after deformation. Conversely, a region that was a lead portion before deformation may become a coaxial portion after deformation.

The electrodes 1800a, 1800a', 1800b, 1800b' are arranged in place of the electrodes 1100a, 1500a, 1100a', 1500a', 1100b, 1500b, 1100b', 1500b', respectively.
A first end face of the coaxial portion of the electrode 1800a is in contact (electrically connected) with a first end face of the coil C. As shown in FIG. The first end face of the electrode 1800a′ contacts (is electrically connected to) the first end face of the coil C at a position on the inner peripheral side of the contact position of the electrode 1800a. A first end face of the coaxial portion of the electrode 1800b is in contact (electrically connected) with a second end face of the coil C. As shown in FIG. The first end face of the electrode 1800b' contacts (is electrically connected to) the second end face of the coil C at a position on the inner peripheral side of the contact position of the electrode 1800b.

The electrodes 1800a, 1800a', 1800b, 1800b' are elastic like the electrodes 1500a, 1500a', 1500b, 1500b' of the sixth embodiment. However, the electrodes 1800a, 1800a', 1800b, 1800b' may not have elasticity.

An example of the configuration and method for making the diameter of the coaxial portion of the electrodes 1800a and 1800a' variable will be described below.
The backup portion 1810a contacts the second end faces of the coaxial portions of the electrodes 1800a and 1800a' while the coaxial portions of the electrodes 1800a and 1800a' are slidable. The backup portion 1810a and the electrodes 1800a, 1800a' are in contact while being electrically insulated. The backup part 1810a is configured using an insulating material, for example.
In the example shown in FIGS. 18A to 18C, the backup portion 1810a has a hollow cylindrical shape, through holes 1811a to 1818a whose longitudinal direction is the radial direction of the backup portion 1810a, and through holes 1871a to 1872a parallel to the through hole 1815a. , 1881a-1882a. The backup portion 1810a is arranged so as to be substantially coaxial with the axis O of the coil C and the axes of the electrodes 1800a and 1800a'. Although the through hole 1815a is shown for convenience of explanation, the through hole 1815a may be omitted.

As shown in FIG. 18A, when the first end surface of the coil C is viewed (from the front), the through holes 1811a to 1818a are radially centered on the axis of the backup portion 1810a. The through-holes 1811a to 1818a are preferably positioned to be rotationally symmetrical about the axis of the backup portion 1810a. In the example shown in FIG. 18A, there are eight through holes 1811a-1818a. Therefore, the eight through-holes 1811a to 1818a are preferably arranged in eight-fold symmetry with the axis of the backup portion 1810a as the rotation axis.

The modulus of elasticity of the electrodes 1800a and 1800a' is lower than that of the backup portion 1810a. When the electrodes 1800a and 1800a′ are brought into contact with (electrically connected to) the first end surface of the coil C, the electrodes 1800a and 1800a′ are deformed according to the shape of the first end surface of the coil C; The electrodes 1800a and 1800a′ and the backup portion 1810a are configured so as to prevent the backup portion 1810a from being deformed and to prevent the position of the electromagnetic steel sheets forming the coil C from being shifted. is preferred. If the electrodes 1800a and 1800a' do not have elasticity, the elastic modulus of the electrodes 1800a and 1800a' may not be lower than the elastic modulus of the backup portion 1810a.

In the through holes 1811a, 1812a, 1813a, 1814a, 1816a, 1817a, 1818a, outer peripheral side movable portions 1821a, 1822a, 1823a, 1824a, 1825a, 1826a, 1827a, inner peripheral side movable portions 1831a, 1832a, 1833a, 1834a, 1835a, 1836a, 1837a are arranged. The outer movable portions 1821a, 1822a, 1823a, 1824a, 1825a, 1826a, and 1827a are positioned further outward than the inner movable portions 1831a, 1832a, 1833a, 1834a, 1835a, 1836a, and 1837a.

In the example shown in FIGS. 18A to 18C, the lead portions of the electrodes 1800a and 1800a′ are respectively connected to one end of the C-shaped coaxial portion of the electrodes 1800a and 1800a′ and the other end with the through hole 1815a interposed therebetween. It is pulled out in the direction of the outer peripheral side of the coil C from the end.
In the example shown in FIGS. 18A-18C, the two leads of electrode 1800a are spaced apart so that electrode 1800a does not short when current is passed through electrode 1800a. The two leads of electrode 1800a' are spaced apart so that electrode 1800a is not shorted when current flows through electrode 1800a'. In addition, the lead portion of the electrode 1800a and the lead portion of the electrode 1800a′ are separated from each other so that the lead portion of the electrode 1800a and the lead portion of the electrode 1800a′ are not short-circuited when current flows through the electrodes 1800a and 1800a′. be done. If the surfaces of the electrodes 1800a and 1800a' (at least the lead portions) are insulated, the lead portions of the electrodes 1800a and 1800a' do not have to be separated from each other (they may be in contact).

The separation distance between the one end and the other end of the C-shaped coaxial portion of the electrodes 1800a and 1800a' is the distance necessary for arranging the lead portions of the electrodes 1800a and 1800a' as described above. It is preferable that the separation distance between one end portion and the other end portion of the C-shape of the coaxial portion of the electrodes 1800a and 1800a' be as short as possible. The minimum distance between one end and the other end of the C-shaped coaxial portion of the electrodes 1800a and 1800a' is the total thickness of the lead portions of the electrodes 1800a and 1800a'. If the surfaces of the electrodes 1800a and 1800a' (at least the lead portions) are not insulated, it is necessary to ensure that the total thickness of the lead portions of the electrodes 1800a and 1800a' is sufficient to prevent short circuits between the electrodes 1800a and 1800a'. A value obtained by adding the minimum value of a certain distance becomes the minimum value of the separation distance between one end portion and the other end portion of the C-shaped coaxial portion of the electrodes 1800a and 1800a'. When an insulator is placed between the lead portions of the electrodes 1800a and 1800a', the distance required to prevent short circuits between the electrodes 1800a and 1800a' is shorter than when the insulator is not placed.

The outer peripheral movable portions 1821a to 1827a contact the inner peripheral surface of the coaxial portion of the electrode 1800a while being electrically insulated from the electrode 1800a and the backup portion 1810a. The inner peripheral movable portions 1831a to 1837a contact the inner peripheral surface of the coaxial portion of the electrode 1800a' while being electrically insulated from the electrode 1800a' and the backup portion 1810a. The outer peripheral side movable portions 1821a to 1827a and the inner peripheral side movable portions 1831a to 1837a are configured using an insulating material, for example.

The outer peripheral side movable portions 1821a to 1827a and the inner peripheral side movable portions 1831a to 1837a have the same configuration. The outer peripheral movable portions 1821a-1827a and the inner peripheral movable portions 1831a-1837a each have an outer cylindrical portion and an inner cylindrical portion. The outer cylindrical portion and the inner cylindrical portion are coaxially integrated. The diameter of the outer cylindrical portion is longer than the diameter of the inner cylindrical portion, and is longer than the width of the through holes 1811a to 1818a (the circumferential length of the backup portion 1810a). The diameter of the inner cylindrical portion is slightly shorter than the width of the through holes 1811a-1818a. The inner cylindrical portions of the outer peripheral side movable portions 1821a to 1827a and the inner peripheral side movable portions 1831a to 1837a are arranged in the through holes 1811a to 1818a. In addition, the length (height) of the inner cylindrical portions of the outer peripheral side movable portions 1821a to 1827a and the inner peripheral side movable portions 1831a to 1837a is longer than the depth of the through holes 1811a to 1818a.

The linear actuator 1861a is for moving the outer peripheral side movable portion 1821a and the inner peripheral side movable portion 1831a along the through hole 1811a in the radial direction of the backup portion 1810a. In this embodiment, the linear actuator 1861a can move the outer peripheral side movable portion 1821a and the inner peripheral side movable portion 1831a separately.
The tips of the inner cylindrical portions of the outer peripheral side movable portion 1821a and the inner peripheral side movable portion 1831a protrude toward the linear actuator 1861a from the through hole 1811a. The projecting region is connected to the movable portion of the linear actuator 1861a.
Since the linear actuator 1861a itself can be realized by a known technique, its detailed description is omitted.

Linear actuators are also arranged for the outer peripheral side movable portions 1822a to 1827a and the inner peripheral side movable portions 1832a to 1837a. In the example shown in FIGS. 18A to 18C, there are seven outer peripheral side movable portions 1821a to 1827a and seven inner peripheral side movable portions 1831a to 1837a, so seven linear actuators are arranged. The description of the linear actuators for the outer peripheral side movable portions 1822a to 1827a and the inner peripheral side movable portions 1832a to 1837a is given in the above description of the linear actuator 1861a for the outer peripheral side movable portions 1821a and the inner peripheral side movable portions 1831a. , the inner peripheral side movable portion 1831a, the through hole 1811a, respectively, the outer peripheral side movable portion 1822a, 1823a, 1824a, 1825a, 1826a, 1827a, the inner peripheral side movable portion 1832a, 1833a, 1834a, 1835a, 1836a, 1837a, the through hole 1812a, 1813a, 1814a, 1816a, 1817a and 1818 may be substituted. Therefore, detailed description of the linear actuators for the outer peripheral movable portions 1822a to 1827a and the inner peripheral movable portions 1832a to 1837a will be omitted.

Through holes 1871a to 1872a and 1881a to 1882a are arranged at intervals in parallel with the longitudinal direction of through hole 1815a on both sides of backup portion 1810a of through hole 1815a in the circumferential direction. be. The size and shape of the through holes 1871a to 1872a and 1881a to 1882a are, for example, the same as those of the through holes 1811a to 1818a. The through-holes 1871a-1872a are located closer to the through-hole 1815a than the through-holes 1881a-1882a. Intervals between the through holes 1871a to 1872a and 1881a to 1882a are determined so as not to short-circuit the electrodes 1800a and 1800a' described above.

Outer peripheral side movable portions 1851a to 1852a contact the outer peripheral surface of electrode 1800a in a state of being electrically insulated from electrode 1800a and backup portion 1810a at the position of the boundary portion between the coaxial portion and lead portion of electrode 1800a. The outer peripheral side movable portions 1851a to 1852a are composed of the same components as the outer peripheral side movable portions 1821a to 1827a and the inner peripheral side movable portions 1831a to 1837a. Each of the outer peripheral side movable portions 1851a to 1852a has an outer cylindrical portion and an inner cylindrical portion. The inner cylindrical portions of the outer peripheral side movable portions 1851a to 1852a are arranged in the through holes 1871a to 1872a, respectively.

Linear actuators are also arranged for the outer peripheral movable portions 1851a to 1852a. The linear actuators for the outer peripheral movable portions 1821a to 1827a and the inner peripheral movable portions 1831a to 1837a individually move the outer peripheral movable portions and the inner peripheral movable portions, respectively. On the other hand, the linear actuators for the outer peripheral side movable portions 1851a to 1852a each move one movable portion (the outer peripheral side movable portions 1851a to 1852a). Further, the direction in which the outer peripheral side movable portions 1851a to 1852a are moved is the direction parallel to the through hole 1815a (the direction along the through holes 1871a to 1872a). The linear actuator for the outer peripheral side movable portions 1851a to 1852a differs from the above description of the linear actuator 1861a for the outer peripheral side movable portion 1821a and the inner peripheral side movable portion 1831a only in the above points. Therefore, detailed description of the linear actuators for the outer peripheral movable portions 1851a to 1852a is omitted.

The inner peripheral side movable portions 1841a to 1842a are provided on the outer peripheral surface of the electrode 1800a' at the position of the boundary between the coaxial portion and the lead portion of the electrode 1800a' while being electrically insulated from the electrode 1800a' and the backup portion 1810a. Contact. The inner peripheral side movable portions 1841a to 1842a are composed of the same components as the outer peripheral side movable portions 1821a to 1827a and the inner peripheral side movable portions 1831a to 1837a. Each of the inner peripheral movable portions 1841a to 1842a has an outer cylindrical portion and an inner cylindrical portion. The inner cylindrical portions of the inner peripheral movable portions 1841a to 1842a are arranged in the through holes 1881a to 1882a, respectively.

Linear actuators are also arranged for the inner peripheral movable portions 1841a to 1842a. FIG. 18C illustrates the linear actuator 1862a for the inner peripheral movable portion 1841a. The linear actuators for the outer peripheral movable portions 1821a to 1827a and the inner peripheral movable portions 1831a to 1837a individually move the outer peripheral movable portions and the inner peripheral movable portions, respectively. On the other hand, the linear actuators for the inner peripheral side movable portions 1841a to 1842a respectively move one movable portion (inner peripheral side movable portions 1841a to 1842a). Further, the direction in which the inner peripheral side movable portions 1841a to 1842a are moved is the direction parallel to the through hole 1815a (the direction along the through holes 1881a to 1882a). The linear actuator for the inner peripheral side movable portions 1841a to 1842a is different from the above description of the linear actuator 1861a for the outer peripheral side movable portion 1821a and the inner peripheral side movable portion 1831a only in the above points. Therefore, detailed description of the linear actuators for the inner peripheral movable portions 1841a to 1842a is omitted.

The positions of the outer peripheral side movable portions 1821a to 1827a and 1851a to 1852a and the inner peripheral side movable portions 1831a to 1837a and 1841a to 1842a are changed using linear actuators according to the diameter of the coaxial portion of the electrodes 1800a and 1800a'. At this time, it is preferable that the distances from the axis of the backup portion 1810a (coil C) of the outer peripheral side movable portions 1821a to 1827a are substantially the same. In addition, the distance from the axis of the backup portion 1810a (coil C) of the inner peripheral side ends of the outer peripheral side movable portions 1851a to 1852a is the distance from the axis of the backup portion 1810a (coil C) of the outer peripheral side movable portions 1821a to 1827a. It is preferable to make it approximately the same as the sum of the distance and the thickness of the electrode 1800 (of the movable portion). When the positions of the outer peripheral side movable portions 1821a to 1827a, 1851a to 1852a and the inner peripheral side movable portions 1831a to 1837a, 1841a to 1842a are completed, the outer peripheral side movable portions 1821a to 1827a, 1851a to 1852a and the inner peripheral side movable portion 1831a are completed. The positions of ~1837a, 1841a-1842a are fixed.

In addition, by using a tension applying device (not shown), tension is applied to the electrodes 1800a and 1800a' by pulling the leading ends of the electrodes 1800a and 1800a' (in the direction of the white arrows in FIG. 18A). . As a result, the position of the boundary between the coaxial portion of the electrode 1800a and the lead-out portion is changed according to the positions of the outer peripheral side movable portions 1851a to 1852a, and the coaxial portion of the electrode 1800a is aligned with the inner peripheral side movable portions 1821a to 1827a. It becomes an annular shape with a diameter depending on the position. Similarly, the position of the boundary between the coaxial portion and the lead portion of the electrode 1800a' is changed according to the positions of the inner peripheral side movable portions 1841a to 1842a, and the coaxial portion of the electrode 1800a' It becomes an annular ring with a diameter corresponding to the position of ~1837a. Since the tension applying device can be realized by a known technique, detailed description thereof will be omitted here.

Even if the tension is applied to the electrodes 1800a and 1800a′ while changing the positions of the outer peripheral side movable portions 1821a to 1827a and 1851a to 1852a and the inner peripheral side movable portions 1831a to 1837a and 1841a to 1842a, the outer peripheral side movable portions can be applied. This may be done after the positions of the portions 1821a to 1827a, 1851a to 1852a and the inner peripheral side movable portions 1831a to 1837a, 1841a to 1842a have been changed.

As shown in FIGS. 18A and 18B, an insulating sheet 1890a is arranged between the lead portions of the electrodes 1800a and 1800a' and the coil C. As shown in FIGS. In FIG. 18A, the portion hidden by the insulating sheet 1890a is indicated by a dashed line.
The insulating sheet 1890a is made of an insulating material. The thickness of the insulating sheet 1890a is preferably thin so that the conduction between the coaxial portions (the C-shaped portion in FIG. 18A) of the electrodes 1800a, 1800a' and the coil C is not hindered. Further, the shape and size of the insulating sheet 1890a are determined so as to ensure insulation between the lead portions of the electrodes 1800a and 1800a' and the coil C even if the diameters of the electrodes 1800a and 1800a' are changed. preferable.
FIG. 18A shows an example in which the insulating sheet 1890a has a rectangular planar shape.

Also, in FIG. 18A, the radial region of the insulating sheet 1890a is between the position in contact with the inner peripheral surface of the backup portion 1810a and the position outside the outer peripheral surface of the backup portion 1810a (lower side in FIG. 18A). A certain case is given as an example. The radial region of the insulating sheet 1890a may be between the position contacting the inner peripheral surface of the backup portion 1810a and the position contacting the outer peripheral surface of the backup portion 1810a.
FIG. 18A also shows an example in which the circumferential region of the insulating sheet 1890a is in the region from the position of the radial centerline of the through hole 1881a to the position of the centerline of the through hole 1882a. A circumferential region of the insulating sheet 1890a is shown as an example of a region from the position of the radial centerline of the through hole 1881a to the position of the centerline of the through hole 1882a.
The above is an example of the configuration and method for making the diameters of the coaxial portions of the electrodes 1800a and 1800a' variable.

The configuration and method for making the diameter of the coaxial portion of the electrode 1800a′ arranged on the second end face side of the coil C variable is the configuration and method for making the diameter of the coaxial portion of the electrode 1800a variable. 18A, 18B, 18C to FIGS. 19A, 19B, 19C, the first end face of coil C to the second end face of coil C, electrodes 1800a, 1800a′ to electrode 1800b, 1800b', the backup portion 1810a to the backup portion 1810b, the through holes 1811a to 1818a to the through holes 1811b to 1818b, the outer peripheral side movable portions 1821a to 1827a to the outer peripheral side movable portions 1821b to 1827b, and the inner peripheral side movable portions 1831a to 1831b. 1837a to the inner peripheral side movable portions 1831b to 1837b, inner peripheral side movable portions 1841a to 1842a to the inner peripheral side movable portions 1841b to 1842b, outer peripheral side movable portions 1851a to 1852a to the outer peripheral side movable portions 1851b to 1852b, linear actuators Linear actuators 1861b and 1862b replace 1861a and 1862a, through holes 1871a-1872a and 1881a-1882a replace through holes 1871b-1872b and 1881b-1882b, and insulating sheet 1890a replaces insulating sheet 1890b. Therefore, detailed description of the configuration and method for making the diameter of the coaxial portion of the electrode 1800a' arranged on the second end face side of the coil C variable is omitted.

As described in each embodiment, the closer the positions of the electrodes 1800a and 1800b in the radial direction of the coil C (the winding thickness direction of the electromagnetic steel sheet), the better, and more preferably substantially the same. Preferably, they are most preferably the same (since it is not easy to make them exactly the same in practice, it is sufficient if they are approximately the same). The positions of the electrodes 1800a′ and 1800b′ in the radial direction of the coil C (the winding thickness direction of the electromagnetic steel sheet) are preferably closer, more preferably substantially the same, and most preferably the same (in practice). It is not easy to make them exactly the same, so it is sufficient if they are approximately the same).

As described above, in the present embodiment, the electrodes 1800a, 1800a′, 1800b, and 1800b′ are made flexible so that the diameter of the coaxial portion of the electrodes 1800a, 1800a′, 1800b, and 1800b′ can be changed. do. Therefore, the iron loss measurement region in the coil C can be freely set.
In addition, in this embodiment, the outer peripheral side movable portions 1821a to 1827a and 1821b to 1827b contact the inner peripheral surfaces of the electrodes 1800a and 1800b, and the inner peripheral side movable portion 1831a contact the inner peripheral surfaces of the electrodes 1800a' and 1800b'. 1837a, 1831b to 1837b are moved in the radial direction of the backup portions 1810a, 1810b (coil C) to change the diameters of the coaxial portions of the electrodes 1800a, 1800a′, 1800b, 1800b′. Therefore, the diameter of the coaxial portion of the electrodes 1800a and 1800b can be freely changed while maintaining the annular shape as much as possible.

The configuration and method for changing the diameter of the coaxial portions of the electrodes 1800a, 1800a', 1800b, 1800b' are not limited to those shown in Figures 18A-18C. For example, increasing the number of moving parts than shown in FIGS. 18A-18C and FIGS. good too. With this configuration, the movable portion can be arranged so as to sandwich the electrodes 1800a, 1800a', 1800b, and 1800b' from the inner peripheral surface side and the outer peripheral surface side. When changing the diameter of the coaxial portion of ', the shape of the electrodes 1800a, 1800a', 1800b, 1800b' can be further suppressed from being changed from an annular shape.

Alternatively, the through holes 1871a to 1872a, 1881a to 1882a, 1871b to 1872b, and 1881b to 1882b may be oriented along the radial direction of the backup portions 1810a and 1810b without providing the through holes 1815a and 1815b. In this case as well, the insulating sheets are arranged so as to ensure insulation between the lead portions of the electrodes 1800a, 1800a', 1800b, and 1800b' and the coil C. FIG. In this case, the planar shape and size of the insulating sheet are determined according to the directions and sizes of the through holes 1871a-1872a, 1881a-1882a, 1871b-1872b, and 1881b-1882b. In this case, the planar shape of the insulating sheet may be trapezoidal.
Also in this embodiment, various modifications described in the first embodiment, the second embodiment, and the fourth to sixth embodiments can be adopted.

(Other modifications)
In addition, among the embodiments of the present invention described above, the processing performed by the arithmetic device 80 can be realized by a computer executing a program. A computer-readable recording medium recording the program and a computer program product such as the program can also be applied as embodiments of the present invention. Examples of recording media that can be used include flexible disks, hard disks, optical disks, magneto-optical disks, CD-ROMs, magnetic tapes, nonvolatile memory cards, and ROMs.
In addition, the embodiments of the present invention described above are merely examples of specific implementations of the present invention, and the technical scope of the present invention should not be construed to be limited by these. It is. That is, the present invention can be embodied in various forms without departing from its technical concept or main features.

(Relationship with claims)
An example of the relationship between the claims and the above-described embodiments will be described below. In addition, it is as having demonstrated in the modification etc. of each embodiment that description of a claim is not limited to description of embodiment.
<Claim 1>
The circuit configuration step is implemented by, for example, configuring a circuit in the arrangement shown in FIGS. 1 and 7 (step S501 in FIG. 5).
The first electrode, which is the position of the first end surface and is in contact with the relatively outer peripheral position of the coil, is realized by using the electrode 70a and the electrodes 71a to 73a, for example.
The second electrode, which is located on the first end face and is in contact with the relatively inner peripheral position of the coil, is realized by using, for example, the electrode 70a' and the electrodes 71a' to 73a'. be.
The first electrode, which is the position of the second end face and is in contact with the relatively outer peripheral position of the coil, is realized by using the electrode 70b and the electrodes 71b to 73b, for example.
The second electrode, which is the position of the second end surface and is in contact with the relatively inner peripheral position of the coil, is realized by using, for example, the electrode 70b' and the electrodes 71b' to 73b'. be.
A circuit configured using the first electrode, the second electrode, the third electrode, the fourth electrode, and the coil, wherein the first electrode and the second electrode are A circuit in which the third electrode and the fourth electrode are electrically connected as an input terminal is configured using, for example, an electrode 70a, an electrode 70a', an electrode 70b, an electrode 70b', and a coil C. It is realized by using a circuit in which the electrodes 70a and 70a' are used as input terminals and the electrodes 70b and 70b' are electrically connected. The first embodiment shown in FIG. 1 shows an example in which the electrodes 70b and 70b' are shorted, and the second embodiment shown in FIG. An example of electrical connection via 60 is shown.
The iron loss deriving step is implemented by, for example, step S505 in FIG.
The measurement area of the coil is determined by the contact positions of the first electrode, the second electrode, the third electrode, and the fourth electrode with the soft magnetic plate, for example, the coil C corresponds to the area shown in gray in FIGS. 2(a), 2(b) and 4.
<Claim 2>
The resistance deriving step is realized by step S502 in FIG. 5, for example.
The joule loss derivation step is realized by step S504 in FIG. 5, for example.
<Claim 3, 14>
The alternating current flowing in the circuit is the alternating current flowing between the third electrode and the fourth electrode, for example, as shown in FIG. This is achieved by measuring the alternating current flowing between the
<Claim 4, 15>
The first electrode, the second electrode, the third electrode, and the fourth electrode each consist of a plurality of electrodes connected in parallel, for example, electrodes 70a, 70a', 70b, This corresponds to using electrodes 71a to 73a, 71a' to 73a', 71b to 73b, and 71b' to 73b' instead of 70b', respectively.
Further, the plurality of electrodes are arranged in the circumferential direction of the coil so that the radial positions of the coil are substantially the same, for example, the electrodes 71a to 73a, 71a' to 73a', 71b to 73b , 71b' to 73b' are, as shown in FIGS. 8(a) and 8(b), the radial positions of the coil C (the positions of the coils C shown in FIGS. 8(a) and 8(b)). It corresponds to being arranged in the circumferential direction of the coil C so that the distance from the axis O) is substantially the same.
<Claim 5, 16>
An index value indicating how much the iron loss changes when the soft magnetic plate has a curvature compared to when it is flat is realized by using an iron loss deterioration rate X, for example.
The index value is obtained by deriving the iron loss in the measurement region of the coil using the iron loss of a soft magnetic plate bent with a curvature substantially the same as the curvature of the coil and the iron loss of a flat soft magnetic plate. For example, before the flow chart of FIG. Information indicating the relationship is derived using the measured value of the iron loss WR of (the sample of) the electromagnetic steel sheet bent at each curvature radius and the measured value of the iron loss WF of the (sample of) the magnetic steel sheet that is flat. is stored in the arithmetic unit 80.
<Claim 6, 17>
The first electrodes are realized, for example, by using electrodes 70a, 71a-73a. The second electrodes are realized, for example, by using electrodes 70a', 71a'-73a'. A third electrode is realized by using electrodes 70b, 71b-73b. For example, a fourth electrode is realized by using electrodes 70b', 71b'-73b'.
The positions of the needle-shaped portions of the first electrode and the third electrode in the radial direction and the circumferential direction of the coil are substantially the same, and the needle-shaped portions of the second electrode and the fourth electrode are substantially the same. , the positions of the coils in the radial direction and the circumferential direction are substantially the same, for example, the electrode 70a (contact a) and the electrode 70b (contact b) in the radial direction of the coil C (the winding thickness direction of the electromagnetic steel sheet) (the distance from the axis O of the coil C shown in FIG. 2(a)) and the circumferential direction (the direction in which the electromagnetic steel sheet is wound) are substantially the same, and the electrode 70a' (contact a') and the electrode 70b' Position of (contact b′) in the radial direction of the coil C (the winding thickness direction of the electromagnetic steel sheet) (distance from the axis O of the coil C shown in FIG. 2B) and in the circumferential direction (direction in which the electromagnetic steel sheet is wound) are substantially the same.
<Claim 7, 18>
The first electrodes are realized, for example, by using electrodes 1100a, 1500a, 1800a. The second electrodes are realized, for example, by using electrodes 1100a', 1500a', 1800a'. A third electrode is realized, for example, by using electrodes 1100b, 1500b, 1800b. A fourth electrode is realized, for example, by using electrodes 1100b', 1500b', 1800b'.
The positions of the coaxial portions of the first electrode and the third electrode in the radial direction of the coil are substantially the same, and the coaxial portions of the second electrode and the fourth electrode are the coaxial portions of the coil. The fact that the positions in the radial direction are substantially the same means that, for example, the positions of the electrodes 1100a and 1100b in the radial direction of the coil C (the winding thickness direction of the electromagnetic steel sheet) (the distance from the axis O of the coil C shown in FIG. 11 ) are substantially the same, and the positions of the electrodes 1100a′ and 1100b′ in the radial direction of the coil C (the winding thickness direction of the electromagnetic steel sheet) (the distance from the axis O of the coil C shown in FIG. 11) are substantially the same. corresponds to This is also true for electrodes 1500a, 1500a′, 1500b, 1500b′ (see FIG. 16) and for electrodes 1800a, 1800a′, 1800b, 1800b′ (see FIGS. 18A-18C and 19A-19C). are the same.
The shape of the cross section of the coaxial portion taken in the direction perpendicular to the axis of the coaxial portion is not limited to an annular shape, but may be an annular shape, a partially missing annular shape, or a spiral shape. , as described in the modification of the fifth embodiment.
<Claim 8, 19>
The backup unit is realized by using backup units 1510a and 1510b, for example. The reason why the elastic modulus of the coaxial portion is lower than that of the backup portion is that the elastic modulus of the electrodes 1500a, 1500a', 1500b, and 1500b' is lower than that of the backup portions 1510a and 1510b. handle.
<Claims 9 and 20>
The first electrode is realized, for example, by using electrode 1800a. The second electrode is realized, for example, by using electrode 1800a'. A third electrode is realized, for example, by using electrode 1800b. A fourth electrode is realized, for example, by using electrode 1800b'.
<Claim 10, 21>
The plurality of movable portions of the first movable portion are realized by using outer peripheral side movable portions 1821a to 1827a, for example. The plurality of movable parts of the second movable part are realized by using inner circumference side movable parts 1831a to 1837a, for example. The plurality of movable parts of the third movable part are realized by using outer peripheral side movable parts 1821b to 1827b, for example. The plurality of movable parts of the fourth movable part are realized by using inner circumference side movable parts 1831b to 1837b, for example.
<Claims 11 and 22>
The through holes are realized by using through holes 1811a to 1814a, 1816a to 1818a, 1811b to 1814b, and 1816b to 1818b, for example.
The backup unit is realized by using backup units 1810a and 1810b, for example.
<Claim 12>
The AC power supply means is realized by using the AC power supply 20, for example.
The iron loss derivation means is realized by using the iron loss derivation section 84, for example.
<Claim 13>
A DC power supply means is realized by using a DC power supply 10, for example.
The direct current resistance deriving means is realized by using the direct current resistance deriving section 82, for example.

10: DC power supply, 20: AC power supply, 30: Changeover switch, 40: Ammeter, 50: Voltmeter, 60: Power meter, 70a to 73a 70a' to 73a' 70b to 73b 70b' to 73b': Electrodes, 80: Arithmetic unit, 81: Control unit, 82: DC resistance derivation unit, 83: AC input adjustment unit, 84: Iron loss derivation unit, 85: Output unit, a to b: Contacts

Claims (22)

An iron loss measuring method for measuring the iron loss of a coil formed by winding a soft magnetic plate in a coil shape, in the coil state,
At the position of the first end face, which is one of the end faces of the coil-shaped soft magnetic plate in the plate width direction, the positions on the outer peripheral side and the inner peripheral side of the coil, The position of the second end face, which is the other end face of the end faces in the plate width direction of the coil-shaped soft magnetic plate, with which the first electrode and the second electrode are brought into contact, respectively, and the coil A third electrode and a fourth electrode are brought into contact with a position on the outer peripheral side and a position on the inner peripheral side, respectively, and the first electrode, the second electrode, the third electrode, the A circuit configured using a fourth electrode and the coil, wherein the first electrode and the second electrode are input terminals, and the third electrode and the fourth electrode are electrically a circuit configuration step of configuring a connected circuit;
Supplying AC power to the input end, and using an AC voltage applied between the first electrode and the second electrode and an AC current flowing in the circuit, the iron loss in the measurement region of the coil and an iron loss derivation step of deriving
The measurement area of the coil is determined by the contact positions of the first electrode, the second electrode, the third electrode, and the fourth electrode with the soft magnetic plate,
The positions of the first electrode and the third electrode in the radial direction and the circumferential direction of the coil are substantially the same,
The iron loss measuring method , wherein the positions of the second electrode and the fourth electrode in the radial direction and the circumferential direction of the coil are substantially the same . DC power is supplied to the input terminal to derive a DC resistance of the circuit based on a DC voltage applied between the first electrode and the second electrode and a DC current flowing in the circuit. a resistance derivation step;
Based on the alternating current flowing in the circuit when the alternating current power is supplied to the input terminal or the alternating voltage applied between the first electrode and the second electrode and the direct current resistance of the circuit , and a joule loss derivation step of deriving the joule loss of the circuit,
2. The iron loss measuring method according to claim 1, wherein, in said iron loss deriving step, the Joule loss of said circuit is further used to derive the iron loss of said coil measurement region. 3. The alternating current flowing in the circuit used when deriving the iron loss in the measurement area of the coil is an alternating current flowing between the third electrode and the fourth electrode. 3. The iron loss measuring method according to 1 or 2. The first electrode, the second electrode, the third electrode, and the fourth electrode each consist of a plurality of electrodes connected in parallel,
The iron loss measurement according to any one of claims 1 to 3, wherein the plurality of electrodes are arranged in the circumferential direction of the coil so that the positions in the radial direction of the coil are substantially the same. Method. In the iron loss derivation step, the iron loss in the measurement region of the coil is further used by using an index value indicating how much the iron loss changes compared to the case where the soft magnetic plate has a curvature and is flat. and derive
The index value is obtained by deriving the iron loss in the measurement region of the coil using the iron loss of a soft magnetic plate bent with a curvature substantially the same as the curvature of the coil and the iron loss of a flat soft magnetic plate. The iron loss measuring method according to any one of claims 1 to 4, characterized in that it is determined in advance before it is performed. the first electrode, the second electrode, the third electrode, and the fourth electrode each have a needle-like portion;
The positions of the needle-shaped portions of the first electrode and the third electrode in the radial direction and the circumferential direction of the coil are substantially the same,
The positions of the needle-shaped portions of the second electrode and the fourth electrode in the radial direction and the circumferential direction of the coil are substantially the same,
In the circuit forming step, tips of the needle-like portions of the first electrode, the second electrode, the third electrode, and the fourth electrode are brought into contact with the coil. Item 6. The method for measuring iron loss according to any one of Items 1 to 5. the first electrode, the second electrode, the third electrode, and the fourth electrode each have a coaxial portion;
the positions of the coaxial portions of the first electrode and the third electrode in the radial direction of the coil are substantially the same;
the positions of the coaxial portions of the second electrode and the fourth electrode in the radial direction of the coil are substantially the same;
In the circuit forming step, a first end face, which is one end face in the axial direction of the coaxial portions of the first electrode, the second electrode, the third electrode, and the fourth electrode, is formed into the contacting the coil in a state where the coaxial portion and the coil are substantially coaxial,
6. A cross-sectional shape of the coaxial portion taken in a direction perpendicular to the axis of the coaxial portion is an annular shape, an annular shape lacking one part, or a spiral shape. The method for measuring iron loss according to item 1. The second electrode is the other end surface in the axial direction of the coaxial portion of the first electrode, the coaxial portion of the second electrode, the coaxial portion of the third electrode, and the coaxial portion of the fourth electrode. A backup part is connected to the end face of 2,
8. The iron loss measuring method according to claim 7, wherein the elastic modulus of the coaxial portion is lower than the elastic modulus of the backup portion. the first electrode, the second electrode, the third electrode, and the fourth electrode are flexible;
9. The circuit configuration step includes changing sizes of the coaxial portions of the first electrode, the second electrode, the third electrode, and the fourth electrode. Iron loss measurement method described in. In the circuit configuration step, using first to fourth movable parts each having a plurality of movable parts arranged at intervals in the circumferential direction of the coil and movable in the radial direction of the coil, changing the size of the coaxial portions of the first electrode, the second electrode, the third electrode, and the fourth electrode by moving the plurality of movable portions in a radial direction of the coil; death,
The plurality of movable portions of the first movable portion are in contact with the inner peripheral surface of the coaxial portion of the first electrode, and the plurality of movable portions of the second movable portion are in contact with the second electrode. The plurality of movable portions of the third movable portion contact the inner circumferential surface of the coaxial portion of the third electrode, and the fourth movable portion of the The iron loss measuring method according to any one of claims 7 to 9, wherein the plurality of movable portions are in contact with the inner peripheral surface of the coaxial portion of the fourth electrode. The movable portion is arranged in a through hole that is spaced apart in the circumferential direction of the coil and extends in the radial direction of the coil,
In the circuit configuration step, the movable portion is moved along the through hole,
11. The iron loss measuring method according to claim 10, wherein the plurality of through holes are formed in a backup portion connected to a second end face, which is the other end face in the axial direction of the coaxial portion. An iron loss measurement system that measures the iron loss of a coil formed by winding a soft magnetic plate in a coil shape, in the coiled state,
At the position of the first end face, which is one of the end faces of the coil-shaped soft magnetic plate in the plate width direction, the positions on the outer peripheral side and the inner peripheral side of the coil, a first electrode, a second electrode, respectively contacted;
At the position of the second end surface, which is the other end surface of the end surfaces in the plate width direction of the coil-shaped soft magnetic plate, at the position on the outer peripheral side and the inner peripheral side of the coil, a third electrode, a fourth electrode, respectively contacted;
A circuit configured using the first electrode, the second electrode, the third electrode, the fourth electrode, and the coil, wherein the first electrode and the second electrode are AC power supply means serving as an input terminal for supplying AC power to a circuit to which the third electrode and the fourth electrode are electrically connected;
iron loss deriving means for deriving the iron loss of the coil measurement region using the alternating voltage applied between the first electrode and the second electrode and the alternating current flowing in the circuit; have
The measurement area of the coil is determined by the contact positions of the first electrode, the second electrode, the third electrode, and the fourth electrode with the soft magnetic plate,
The positions of the first electrode and the third electrode in the radial direction and the circumferential direction of the coil are substantially the same,
An iron loss measuring system , wherein the positions of the second electrode and the fourth electrode in the radial direction and the circumferential direction of the coil are substantially the same . DC power supply means for supplying DC power to the circuit;
DC resistance deriving means for deriving the DC resistance of the circuit based on the DC voltage applied between the first electrode and the second electrode and the DC current flowing in the circuit;
The iron loss deriving means comprises an alternating current flowing in the circuit when the alternating current power is supplied to the input terminal or an alternating voltage applied between the first electrode and the second electrode, and the circuit 13. The iron loss measurement system of claim 12, further using a Joule loss based on the DC resistance of the coil to derive the iron loss in the measurement region of the coil. 3. The alternating current flowing in the circuit used when deriving the iron loss in the measurement area of the coil is an alternating current flowing between the third electrode and the fourth electrode. 14. The iron loss measurement system according to 12 or 13. The first electrode, the second electrode, the third electrode, and the fourth electrode each consist of a plurality of electrodes connected in parallel,
The iron loss measurement according to any one of claims 12 to 14, wherein the plurality of electrodes are arranged in the circumferential direction of the coil so that the positions in the radial direction of the coil are substantially the same. system. The iron loss deriving means further uses an index value indicating how much the iron loss changes compared to when the soft magnetic plate has a curvature and is flat, and calculates the iron loss in the measurement region of the coil. and derive
The index value is obtained by deriving the iron loss in the measurement region of the coil using the iron loss of a soft magnetic plate bent with a curvature substantially the same as the curvature of the coil and the iron loss of a flat soft magnetic plate. 16. The iron loss measurement system according to any one of claims 12 to 15, characterized in that it is predetermined before it is performed. the first electrode, the second electrode, the third electrode, and the fourth electrode each have a needle-like portion;
The positions of the needle-shaped portions of the first electrode and the third electrode in the radial direction and the circumferential direction of the coil are substantially the same,
The positions of the needle-shaped portions of the second electrode and the fourth electrode in the radial direction and the circumferential direction of the coil are substantially the same,
17. The coil according to any one of claims 12 to 16, wherein tips of the needle-shaped portions of the first electrode, the second electrode, the third electrode, and the fourth electrode are brought into contact with the coil. or the iron loss measurement system according to item 1. the first electrode, the second electrode, the third electrode, and the fourth electrode each have a coaxial portion;
the positions of the coaxial portions of the first electrode and the third electrode in the radial direction of the coil are substantially the same;
the positions of the coaxial portions of the second electrode and the fourth electrode in the radial direction of the coil are substantially the same;
A first end surface, which is one end surface in the axial direction of the coaxial portions of the first electrode, the second electrode, the third electrode, and the fourth electrode, is located between the coaxial portion and the coil. is substantially coaxial with the coil,
17. The shape of the cross section of the coaxial portion taken in a direction perpendicular to the axis of the coaxial portion is an annular shape, an annular shape with one part missing, or a spiral shape. 2. The iron loss measurement system according to item 1. The second electrode is the other end surface in the axial direction of the coaxial portion of the first electrode, the coaxial portion of the second electrode, the coaxial portion of the third electrode, and the coaxial portion of the fourth electrode. 2 has a backup portion connected to the end face,
19. The iron loss measurement system according to claim 18, wherein the elastic modulus of the coaxial portion is lower than the elastic modulus of the backup portion. the first electrode, the second electrode, the third electrode, and the fourth electrode are flexible;
20. The iron of claim 18 or 19, wherein the coaxial portions of the first, second, third and fourth electrodes are variable in size. loss measurement system. each further having first to fourth movable parts having a plurality of movable parts arranged at intervals in the circumferential direction of the coil and movable in the radial direction of the coil;
The coaxial portions of the first electrode, the second electrode, the third electrode, and the fourth electrode are varied in size by moving the plurality of movable portions in a radial direction of the coil. is,
The plurality of movable portions of the first movable portion are in contact with the inner peripheral surface of the coaxial portion of the first electrode, and the plurality of movable portions of the second movable portion are in contact with the second electrode. The plurality of movable portions of the third movable portion contact the inner circumferential surface of the coaxial portion of the third electrode, and the fourth movable portion of the The iron loss measuring system according to any one of claims 18 to 20, wherein the plurality of movable parts are in contact with the inner peripheral surface of the coaxial portion of the fourth electrode. having a backup portion connected to a second end surface that is the other end surface in the axial direction of the coaxial portion;
The backup portion has a plurality of through holes arranged at intervals in the circumferential direction of the coil and extending in the radial direction of the coil,
22. The iron loss measurement system of claim 21, wherein the movable part is positioned in the through hole and moves along the through hole.

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