JP7252466B2 - 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 an iron loss measuring system, and is particularly suitable for use in measuring iron loss in the plate thickness direction of a soft magnetic plate.

The evaluation of a soft magnetic plate typified by an electromagnetic steel plate is determined by its iron loss. Taking an electromagnetic steel sheet as an example, iron loss as a material property is usually measured by exciting the electromagnetic steel sheet in the rolling direction. However, since the iron core structure of electrical equipment using magnetic steel sheets is complicated, the direction of excitation is not limited to the rolling direction. For example, Patent Literature 1 discloses the structure of a joint of a transformer core. In Patent Document 1, FIGS. 5 and 6 showing the flow of magnetic flux in the cross section of the joint show that the magnetic flux is directed in the direction perpendicular to the surface of the electromagnetic steel sheet. It is known that the iron loss generally increases when the magnetic flux is generated in the direction perpendicular to the surface of the electromagnetic steel sheet. In the following description, such magnetic flux directed in the direction perpendicular to the plate surface will be referred to as vertical magnetic flux as required.

Further, Patent Document 2 proposes an iron core structure for a rotating electric machine as a countermeasure against vertical magnetic flux. The main purpose of Patent Document 2 is to divide the stator core and the rotor core in the direction of the rotation axis to prevent leakage current from the windings to the stator core. In Patent Document 2, it is pointed out that the problem in that case is the vertical magnetic flux generated by the imbalance of the magnetic flux generated by dividing the core. Therefore, Patent Document 2 proposes a structure in which an insulating plate is provided to reduce the vertical magnetic flux.
In Patent Document 2, the iron loss is reduced by devising the core structure, but the iron loss due to the vertical magnetic flux also changes depending on the internal structure of the electromagnetic steel sheet. Therefore, it is a technical issue to develop an electrical steel sheet that can obtain low iron loss even if vertical magnetic flux is generated. To do so, it is first necessary to accurately measure the iron loss characteristics due to the vertical magnetic flux.

Techniques described in Non-Patent Documents 1 and 2 are available as excitation methods for measuring iron loss characteristics due to vertical magnetic flux.
In Non-Patent Document 1, first, a laminated sample is prepared, and the sample is inserted into the gap so that the surface of the sample is in contact with the magnetic pole surface of a frame-shaped core having a gap in part to close the magnetic field. A method of measuring iron loss characteristics in the plate thickness direction of the sample is disclosed by forming a path and exciting it.
In Non-Patent Document 2, first, a laminated sample is prepared, and when a plurality of U-shaped cores are combined to form a closed magnetic circuit, the surface of the sample is brought into contact with the magnetic pole surface of the core. , a method of inserting the sample into the gap and measuring the iron loss characteristic of the sample in the plate thickness direction is disclosed.

JP-A-63-10507 JP 2012-253918 A

"Characteristics of transformer core materials for flux normal to the sheet plane", T. Booth, H. Pfutzner, Journal of Magnetism and Magnetic Materials Vol.133 (1994) p183-186 "Experimental Method for Characterizing Electrical Steel Sheets in the Normal Direction", N. Hihat, J.P. Lecointe, S. Duchesne, E. Napieralska, T. Belgrand, Sensors 2010, Vol.10, p9053-9064

However, the techniques described in Non-Patent Documents 1 and 2 are considered to have problems in measurement accuracy for the following reasons. Since the insulating film portion of the magnetic steel sheet is non-magnetic, when the laminated samples are sandwiched between the cores, magnetic poles are generated on the surface of each sample, and a demagnetizing field is generated. This demagnetizing field reduces the magnetic flux density of the sample. Therefore, rather than all of the magnetic flux emanating from the pole face of the core passes through the sample, it swells up and passes through the outside of the sample. This is called fringing flux and is shown in FIG. As a result, non-uniform magnetic flux density distribution occurs in the sample as shown in FIG. 8 of Non-Patent Document 2. In addition, as shown in FIG. 7, the swelling of the magnetic fluxes 701a and 701b increases as it approaches the center in the stacking direction. For this reason, a difference in magnetic flux density occurs between the sample near the core and the sample located at the center in the stacking direction. Since iron loss is generally organized using the magnetic flux density as a parameter, the non-uniform distribution of the magnetic flux density can be a factor of iron loss error. In addition, in the techniques described in Non-Patent Documents 1 and 2, an excitation current is passed through a coil wound around a core different from that of the sample (that is, external excitation is performed). Therefore, the problem caused by the generation of the fringing magnetic flux as described above can occur even when the magnetic steel sheets to be measured are not laminated (that is, when the number of magnetic steel sheets to be measured is one).
SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to enable accurate measurement of iron loss characteristics in a direction perpendicular to the surface of a soft magnetic plate.

The iron loss measuring method of the present invention is a method for measuring the iron loss of a soft magnetic plate, wherein the iron loss measuring method of the soft magnetic plate is provided on one side surface of the soft magnetic plate in a first direction perpendicular to the first direction. The first electrode and the second electrode are brought into contact with each other at a predetermined distance in the second direction, and the second direction is provided on the other side surface of the soft magnetic plate in the first direction. A third electrode and a fourth electrode are brought into contact at a predetermined distance from each other, and the first electrode, the second electrode, the third electrode, the fourth electrode, and the soft magnetic material A circuit configured using a plate, wherein the first electrode and the second electrode are used as input terminals, and the third electrode and the fourth electrode are electrically connected to form a circuit. A step of forming a circuit, supplying AC power to the input terminal, using an AC voltage applied between the first electrode and the second electrode, and an AC current flowing in the circuit, the soft magnetism and an iron loss derivation step of deriving an iron loss in the plate thickness direction of the measurement area of the body plate, wherein the measurement area of the soft magnetic plate is the first electrode, the second electrode, and the third electrode. and the contact position of the fourth electrode with the soft magnetic plate, and the soft magnetic plate is magnetized in the plate thickness direction by an alternating current flowing through the circuit .

An iron loss measurement system of the present invention is an iron loss measurement system for measuring the iron loss of a soft magnetic plate, and includes: a first electrode and a second electrode, which are in contact with each other at a predetermined distance in a second direction; a third electrode, a fourth electrode, the first electrode, the second electrode, the third electrode, the fourth electrode, and the soft magnetic A circuit configured using a body plate, wherein the first electrode and the second electrode are used as input terminals, and the third electrode and the fourth electrode are electrically connected to the circuit. AC power supply means for supplying power, AC voltage applied between the first electrode and the second electrode, and AC current flowing in the circuit are used to measure the area of the soft magnetic plate. and iron loss derivation means for deriving iron loss in the thickness direction of the soft magnetic plate, and the measurement area of the soft magnetic plate includes the first electrode, the second electrode, the third electrode, and the The position of contact between the fourth electrode and the soft magnetic plate is determined, and the soft magnetic plate is magnetized in the plate thickness direction when an alternating current flows through the circuit.

According to the present invention, it is possible to accurately measure iron loss characteristics in the direction perpendicular to the surface of a soft magnetic plate.

It is a figure which shows an example of a structure of an iron-loss measurement system. It is a figure which shows an example of a structure of an electrode, and an example of the measurement area|region of an electromagnetic steel plate. FIG. 2 is a diagram (cross-sectional view taken along line II in FIG. 1) showing an example of the configuration of a yoke; It is a figure which shows an example of a mode that the yoke was seen from the side. It is a figure which shows an example of a structure of a connection medium. 4 is a flowchart illustrating an example of a method of measuring iron loss; It is a figure explaining fringing magnetic flux. 4 is a diagram conceptually showing an example of magnetic flux flowing in the yoke of the first embodiment; FIG. FIG. 4 is a diagram showing an example of the configuration of a yoke and parts attached to the yoke; FIG. 4 is a diagram showing an example of a soft magnetic plate forming a movable yoke portion; FIG. 4 is a diagram showing an example of a soft magnetic plate forming a fixed yoke portion; It is a figure which shows an example of the one end surface (sliding side end surface) of a movable yoke part and a fixed yoke part. FIG. 5 is a diagram showing an example of how the sliding-side end face of the movable yoke portion and the sliding-side end face of the fixed yoke portion are fitted together; FIG. 10 is a diagram showing an example of the configuration of the yoke and the parts attached to the yoke when the movable yoke portion is rotated; FIG. 4 is a diagram showing an example of arrangement of search coils; It is a figure which shows an example of the structure for controlling rotation operation of a movable yoke part.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following embodiments, an example will be described in which the iron loss of an electromagnetic steel sheet being conveyed in a production line of an electromagnetic steel sheet is measured as the iron loss of a soft magnetic plate. It should be noted that the XYZ coordinates shown in each drawing indicate the orientation relationship in each drawing. Symbols representing XYZ coordinates, in which a circle is filled with a ●, indicate the direction from the back side to the front side of the paper surface, and a circle with an X is shown. The symbol indicates the direction from the front side to the back side of the paper.

(First embodiment)
First, the first embodiment will be described.
FIG. 1 is a diagram showing an example of the configuration of an iron loss measurement system. In each figure, the magnetic steel sheet S is conveyed in a flat state in the direction of the white arrow line (the positive direction of the X-axis).
In FIG. 1, the iron loss measurement system includes 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', connection media 80a to 80c. , yoke 90, arithmetic unit 100, and sensors 110, 120. FIG.
A DC power supply 10 outputs DC power. AC power supply 20 outputs AC power.
The selector 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 the selected power to the electromagnetic steel sheet S 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).

The electrodes 70a, 70a', 70b, and 70b' are in contact with end surfaces (side surfaces) of the electromagnetic steel sheet S in the sheet width direction (Y-axis direction). Connection medium 80a is connected between the output terminals of voltmeter 50 and wattmeter 60 and electrode 70a, and electrically connects the output terminals of voltmeter 50 and wattmeter 60 and electrode 70a to each other. The connection medium 80b is connected between the electrode 70a' and the ground terminal to electrically connect the electrode 70a' and the ground terminal to each other. A connection medium 80c is connected between the electrodes 70b, 70b' and electrically connects the electrodes 70b, 70b' to each other (ie, the electrodes 70b, 70b' are shorted). As will be described later, the connection media 80a and 80b have twisted portions (see FIG. 5). there is

FIG. 2 is a diagram showing an example of the configuration of the electrodes 70a, 70a', 70b, 70b' and an example of the measurement area WR of the electromagnetic steel sheet S. As shown in FIG. Specifically, FIG. 2(a) is a diagram showing an example of the state of the electrodes 70a, 70a', 70b, 70b' and the electromagnetic steel sheet S viewed from the side of the first end face side of the electromagnetic steel sheet S. FIG. 2(b) is a diagram showing an example of the state of the electrodes 70a, 70a', 70b, 70b' and the electromagnetic steel sheet S viewed from the side of the second end surface of the electromagnetic steel sheet S. As shown in FIG.
As shown in FIGS. 1 and 2, each of the electrodes 70a and 70a' is in contact with (is electrically connected to) one point of one end face of the electromagnetic steel sheet S in the plate width direction. In the following description, of the end faces of the electromagnetic steel sheet S in the plate width direction, the end face on the side that the electrode 70a contacts is referred to as the first end face of the electromagnetic steel plate S, and among the end faces of the electromagnetic steel plate S in the plate width direction, The end face on the opposite side of the end face is referred to as the second end face of the electromagnetic steel sheet S as required. The electrodes 70a and 70a' are arranged in a state of being spaced (at a predetermined distance) in the longitudinal direction (X-axis direction) of the electromagnetic steel sheet S. As shown in FIG. Each of the electrodes 70b and 70b' is in contact with (is electrically connected to) one portion of the second end surface of the electromagnetic steel sheet S. As shown in FIG. The electrodes 70b and 70b' are arranged in a state of being spaced (at a predetermined distance) in the longitudinal direction (X-axis direction) of the electromagnetic steel sheet S. As shown in FIG.

In the present embodiment, the shape of the electrodes 70a, 70a', 70b, 70b' is cylindrical. Therefore, the shapes of the contact areas a, a', b, and b' between the electrodes 70a, 70a', 70b, and 70b' and the end faces of the electromagnetic steel sheet S in the sheet width direction are determined in the sheet thickness direction of the electromagnetic steel sheet S (Z-axis direction). In the area of the electromagnetic steel sheet S, the ends of the contact areas a, a', b, b' between the electrodes 70a, 70a', 70b, and 70b' and the end faces of the electromagnetic steel sheet S in the sheet width direction (the ends of the electromagnetic steel sheet S A rectangular parallelepiped region having vertices at both ends in the plate thickness direction (Z-axis direction) is the measurement region WR of the electromagnetic steel sheet S. In FIG. 2(a), the measurement area WR of the electrical steel sheet S is shown in gray (actually, it is not color-coded as in FIG. 2).

The electrodes 70a, 70a', 70b, 70b' slide against the electromagnetic steel plate S so that their positions are substantially unchanged. In this embodiment, the electrodes 70a, 70a', 70b, 70b' are rotatable with their axes (central axes of the cylinders) as rotation axes 71a, 71a', 71b, 71b'. Further, the positions of the rotating shafts 71a, 71a', 71b, 71b' of the electrodes 70a, 70a', 70b, 70b' do not move. By doing so, as shown in FIGS. 2(a) to 2(c), as the electromagnetic steel sheet S is conveyed in the direction of the white arrow line (the positive direction of the X axis), Electrodes 70a, 70a', 70b, 70b' perform rotation about axes of rotation 71a, 71a', 71b, 71b' (see arrow lines attached to electrodes 70a, 70a', 70b, 70b'). ). Even if the electromagnetic steel sheet S is transported in the direction of the white arrow line (the positive direction of the X axis), the positions (XYZ coordinates) of the electrodes 70a, 70a', 70b, and 70b' It is fixed at the positions shown in a) to FIG. 2(c).

By configuring the electrodes 70a, 70a′, 70b, 70b′ as described above, when the electromagnetic steel sheets S are energized while being conveyed, the electrodes 70a, 70a′, 70b, 70b′ and the electromagnetic steel sheets Frictional force generated between S can be reduced. Therefore, the wear and tear of the magnetic steel sheets S and the electrodes 70a, 70a', 70b, 70b' can be suppressed.

Further, the electrode 70a (contact area a) and the electrode 70b (contact area b) are arranged at positions facing each other (with the electromagnetic steel sheet S interposed) in the plate width direction (Y-axis direction) of the electromagnetic steel sheet S, Similarly, the electrode 70a′ (contact area a′) and the electrode 70b′ (contact area b′) face each other (with the electromagnetic steel sheet S interposed therebetween) in the width direction (Y-axis direction) of the electromagnetic steel sheet S. placed in position.

That is, the positions (XZ coordinates) of the electrodes 70a (contact area a) and the electrodes 70b (contact area b) determined from the longitudinal direction (X-axis direction) and plate thickness direction (Z-axis direction) of the electromagnetic steel sheet S are The closer the two, the better, the more preferably they are approximately the same, and the most preferably they are the same. Similarly, the positions (X- Z coordinates) are preferably as close as possible, more preferably approximately the same, and most preferably the same (actually, it is not easy to make them exactly the same, so it is sufficient if they are approximately the same). .
In the above manner, as shown in FIG. 2(a), a rectangular (or similar) area having two sides facing each other along the rolling direction is measured in the same manner as in a general iron loss measurement method. A measurement region WR of the electromagnetic steel sheet S can be used.

Here, when the DC voltage from the DC power supply 10 or the AC voltage from the AC power supply 20 is applied between the electrodes 70a and 70a', the connection medium 80a→the electrode 70a→the electromagnetic steel plate S→the electrode 70b→the connection medium 80c→the electrode 70b A current (a direct current or an alternating current) flows through the path of '→electromagnetic steel plate S→electrode 70a'→connection medium 80→ground terminal or a path opposite to the path.
If the spacing x between the electrodes 70a and 70a' (contact areas a and a') and the spacing x between the electrodes 70b and 70b' (contact areas b and b') are too small, the electrodes 70a and 70a' will not be connected by the electrode 70b. A current may flow without passing through the medium 80c and the electrode 70b'. Preferably, this current is not so large as to affect the accuracy of core loss measurement, and most preferably, this current is zero. From this point of view, when the width of the electromagnetic steel sheet S is y, the ratio of the spacing x between the electrodes 70a and 70a' (contact areas a and a') to the width y of the electromagnetic steel sheet S (=x/y) is preferably 6 or more, more preferably 20 or more.

Returning to the description of FIG. 1, the yoke 90 is magnetically coupled with the measurement region WR of the electromagnetic steel sheet S. As shown in FIG. By applying an AC voltage from the AC power supply 20 between the electrodes 70a and 70a', the connection medium 80a→electrode 70a→electromagnetic steel sheet S→electrode 70b→connection medium 80c→electrode 70b'→electromagnetic steel sheet S→electrode 70a'→ A current (alternating current) flows in the path from the connection medium 80b to the ground terminal or in the opposite direction to the path. The yoke 90 is a closed magnetic field in which the magnetic flux generated from the electromagnetic steel sheet S by this current returns from one plate surface of the measurement region WR of the electromagnetic steel plate S to the other plate surface of the measurement region WR of the electromagnetic steel plate S via the yoke 90. It is magnetically coupled with the electromagnetic steel sheet S so as to flow through the path. In FIG. 1, among the electromagnetic steel sheets S, the electrodes 70b and 70b', and the connection medium 80c, portions hidden by the yoke 90 (portions visible when viewed through) are indicated by dashed lines.

FIG. 3 is a diagram showing an example of the configuration of the yoke 90, and is a cross-sectional view taken along the line II of FIG. FIG. 4 is a diagram showing an example of how the yoke 90 is viewed from its side. Specifically, FIG. 4A is a view of the yoke 90 viewed from the direction of the arrow line A shown in FIG. 1, and FIG. It is the figure seen from.

Yoke 90 has magnetic pole surfaces 90a and 90b, which are opposed to one and the other plate surfaces of magnetic steel sheet S in measurement region WR.
The magnetic pole faces 90a and 90b are longer than the measurement region WR of the magnetic steel sheet S in the longitudinal direction (X-axis direction) of the magnetic steel sheet S, and are perpendicular to the surface of the magnetic steel sheet S (Z-axis direction). ), in the longitudinal direction (X-axis direction) of the electromagnetic steel sheet S, when the magnetic pole faces 90a and 90b protrude from the measurement area WR of the electromagnetic steel sheet S, in the area of the electromagnetic steel sheet S , the magnetic flux penetrates an area of the magnetic steel sheet S that is wider than the measurement area WR. Therefore, the iron loss is measured in a region wider than the measurement region WR of the magnetic steel sheet S, and the measurement region of the magnetic steel sheet S becomes unclear.

Conversely, the magnetic pole faces 90a and 90b are shorter in the longitudinal direction (X-axis direction) of the magnetic steel sheet S than the measurement region WR of the magnetic steel sheet S, and perpendicular to the surface of the magnetic steel sheet S. direction (Z-axis direction), in the longitudinal direction (X-axis direction) of the electromagnetic steel sheet S, if the measurement area WR of the electromagnetic steel sheet S protrudes from the pole faces 90a and 90b, the electromagnetic The magnetic flux density of the protruding region of the measurement region WR of the steel sheet S is lower than that of the region of the measurement region WR of the electromagnetic steel sheet S that overlaps the magnetic pole faces 90a and 90b. Therefore, the magnetic flux density becomes uneven.

In addition, the magnetic pole faces 90a and 90b are shorter in the width direction (Y-axis direction) of the electromagnetic steel sheet S than the measurement region WR of the electromagnetic steel sheet S, and the direction perpendicular to the surface of the electromagnetic steel sheet S ( When viewed from the Z-axis direction), in the width direction (Y-axis direction) of the electromagnetic steel sheet S, the electromagnetic The magnetic flux density of the protruding region of the measurement region WR of the steel sheet S is lower than that of the region of the measurement region WR of the electromagnetic steel sheet S that overlaps the magnetic pole faces 90a and 90b. Therefore, the magnetic flux density becomes uneven.

The magnetic pole surfaces 90a and 90b are longer in the width direction (Y-axis direction) of the electromagnetic steel sheet S than the measurement region WR of the electromagnetic steel sheet S, and the direction perpendicular to the surface of the electromagnetic steel sheet S (Z-axis direction) of the magnetic steel sheet S, in the width direction (Y-axis direction) of the magnetic steel sheet S, when the magnetic pole faces 90a and 90b protrude from the measurement region WR of the magnetic steel plate S, the protruding region There is no electromagnetic steel sheet S between. In this case, no major problem arises in terms of magnetic properties. However, from the viewpoint of miniaturizing the yoke 90, when viewed from the direction (Z-axis direction) perpendicular to the plate surface of the electromagnetic steel plate S, the magnetic pole surface 90a , 90b and the measurement area WR of the magnetic steel sheet S are preferably made to coincide with each other.

From the above, in the present embodiment, when viewed from the direction (Z-axis direction) perpendicular to the surface of the electromagnetic steel sheet S, the magnetic pole surfaces 90a and 90b and the measurement region WR of the electromagnetic steel sheet S match ( The pole faces 90a, 90b are sized, shaped, and positioned so that the XY coordinates are the same. That is, the shape of the magnetic pole faces 90a and 90b and the planar shape of the measurement region WR of the magnetic steel plate S are the same, and the size of the magnetic pole faces 90a and 90b and the planar size of the measurement region WR of the magnetic steel plate S are The positions (XY coordinates) of the magnetic pole faces 90a and 90b determined by the longitudinal direction and the sheet width direction of the electromagnetic steel sheet S are the same, and the measurement area WR of the electromagnetic steel sheet S determined by the longitudinal direction and the sheet width direction of the electromagnetic steel sheet S. The positions (XY coordinates) of are the same.
It should be noted that the term "same (match)" as used here is most preferably completely the same (perfectly matched), but in reality it is not easy to make them exactly the same (perfectly matched). It suffices if they are substantially the same (substantially match) (this also applies to other explanations). For example, as shown in FIG. 3, the electrodes 70a, 70a', 70b, 70b' and the yoke 90 are not electrically and magnetically coupled to each other. A gap may be provided between them. In addition, by forming the regions of the electrodes 70a, 70a′, 70b, 70b′ in contact with the yoke 90 with a non-magnetic and non-conductive material, the electrodes 70a, 70a′, 70b, 70b′ and the yoke 90 No gap may be provided between

Moreover, the magnetic pole faces 90a and 90b are arranged in a state in which they are separated from the plate surface of the electromagnetic steel plate S. As shown in FIG. It is preferable that the distance between the magnetic pole faces 90a and 90b and the plate surface of the electromagnetic steel plate S is as short as possible. This is because the magnetic resistance between the magnetic pole faces 90a, 90b and the plate surface of the electromagnetic steel plate S can be reduced. However, it is preferable that the pole surfaces 90a and 90b do not come into contact with the magnetic steel sheet S because the measurement is performed while the magnetic steel sheet S is conveyed. This is because there is a possibility that the surface of the electromagnetic steel sheet S may be flawed.
The yoke 90 is constructed, for example, by stacking soft magnetic plates (for example, non-oriented magnetic steel plates or oriented magnetic steel plates) whose plate surfaces have the shape (of the portion constituting the yoke 90) shown in FIG. can do.

FIG. 5 is a diagram showing an example of the configuration of the connection media 80a-80c. The form of the connection media 80a to 80c is not particularly limited as long as they are configured using a conductor. For example, wires may be used to form the connection media 80a-80c. The electric wire may be a solid wire or a stranded wire. Alternatively, the connection media 80a to 80c may be configured using a plate made of a conductor (for example, a copper plate). The connection media 80a to 80c may be formed by electrically connecting a plate made of a conductor and an electric wire. Also, the conductor may be covered with an insulating material. Also, the connection media 80a-80c are preferably fixed in position. In order to fix the positions of the connection media 80a-80c, the conductors forming the connection media 80a-80c may be held by holding members. The retaining member is preferably composed of a non-insulating, non-magnetic, non-flexing material. If the holding member is configured such that a part of the holding member is arranged in the region between the conductors and the electromagnetic steel plates S that constitute the connection media 80a to 80c, the holding member can be the connection medium. It also has a function of ensuring insulation between 80a to 80c and the electromagnetic steel plate S.

As described above, the connection medium 80a is connected between the output terminals of the voltmeter 50 and the wattmeter 60 and the electrode 70a, and electrically connects the output terminals of the voltmeter 50 and the wattmeter 60 and the electrode 70a to each other. do. The connection medium 80b is connected between the electrode 70a' and the ground terminal to electrically connect the electrode 70a' and the ground terminal to each other. A connection medium 80c is connected between the electrodes 70b, 70b' and electrically connects the electrodes 70b, 70b' to each other.

Further, when an AC voltage is applied between the electrodes 70a and 70a' by the AC power supply 20, the connection medium 80a→electrode 70a→electromagnetic steel sheet S→electrode 70b→connection medium 80c→electrode 70b'→electromagnetic steel sheet S→electrode 70a A current (alternating current) flows through a path of '→connection medium 80b→ground terminal or a path opposite to the path. If there is a space between the connection mediums 80a to 80c and the electromagnetic steel sheet S, the magnetic flux generated by the flow of the current penetrates the space without penetrating the electromagnetic steel sheet S. As will be described later, the AC input adjustment unit 103 adjusts the value of the AC voltage output from the AC power supply 20 so that the average value and frequency of the AC voltage measured by the voltmeter 50 become target values. This target value is determined according to the magnetic flux density, which is the condition for measuring iron loss. Therefore, when the space between the connection mediums 80a to 80c and the electromagnetic steel sheet S becomes larger, the magnetic flux that penetrates the space without penetrating the electromagnetic steel sheet S increases, and the actual magnetic flux density is lower than the iron loss measurement condition. , the magnetic flux density penetrating the electromagnetic steel sheet S becomes smaller. Therefore, even if the value of the AC voltage output from the AC power supply 20 is adjusted to match the target value, the actual magnetic flux density penetrating the electrical steel sheet S is smaller than the magnetic flux density that is the iron loss measurement condition. From the above, it is preferable that the space between the connection mediums 80a to 80c and the electromagnetic steel sheet S is narrow as long as the insulation between the connection mediums 80a to 80c and the electromagnetic steel sheet S is ensured.

One end of the connection medium 80a is connected to, for example, the rotating shaft 71a of the electrode 70a. One end of the connection medium 80b is connected to, for example, the rotating shaft 71b of the electrode 70b. One end and the other end of the connection medium 80c are connected to the rotating shafts 71b, 70b' of the electrodes 70b, 70b'.
The connection medium 80c is arranged along the second end surface of the electromagnetic steel sheet S at a position as close as possible to the second end surface of the electromagnetic steel sheet S within a range in which insulation from the electromagnetic steel sheet S is ensured. It is preferable to

Similarly, the connection media 80a and 80b are arranged along the first end surface of the electromagnetic steel sheet S at a position as close as possible to the first end surface of the electromagnetic steel sheet S within the range where insulation from the electromagnetic steel sheet S is ensured. It is preferred that the However, the other ends of the connection media 80 a and 80 b are connected to output terminals of the voltmeter 50 and the wattmeter 60 . Therefore, the area on the other end side of the connection mediums 80a and 80b is composed of electric wires, and the electric wires that constitute the connection medium 80a and the electric wires that constitute the connection medium 80b are twisted in a state in which the electric wires are insulated. It is preferable to This is because the magnetic fluxes generated in the spaces between the twisted electric wires cancel each other out.

Returning to the description of 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, A DC current flows through a path (closed circuit) returning to the DC power supply 10 via the electromagnetic steel sheet S, the contact b, the electrode 70b, the electrode 70b', the contact b', the electromagnetic steel sheet S, 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 electromagnetic steel sheet S, the contact b, electrode 70b, electrode 70b', contact b', electromagnetic steel sheet S, contact a', a path returning to AC power supply 20 via electrode 70a', and from AC power supply 20, electrode 70a', contact a', electromagnetic Steel plate S, contact b', electrode 70b', electrode 70b, contact b, electromagnetic steel plate S, contact a, electrode 70a, wattmeter 60, ammeter 40, path returning to AC power supply 20 via switch 30 (closed circuit) An alternating current flows through In the following description, this circuit through which alternating current flows will be referred to as a second measurement circuit as required.

The arithmetic device 100 instructs the operation of the DC power supply 10, the AC power supply 20, and the changeover switch 30 arranged as described above, and inputs the measured values of the ammeter 40, the voltmeter 50, and the wattmeter 60. to derive the iron loss in the measurement area. Arithmetic device 100 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 100 will be described below. Note that part or all of the functions of the computing device 100 may be performed by the inspector. Further, in FIG. 1 , among the lines connecting each configuration, the dashed-dotted lines indicate information transmission paths within the arithmetic device 100 and between the arithmetic device 100 and the outside, and the solid lines indicate the information transmission paths from the DC power supply 10. A path (a conductor such as an electric wire) through which the output DC current and the AC current output from the AC power supply 20 flow is shown.

The control unit 101 instructs the DC power supply 10, the AC power supply 20, and the switch 30 to operate.
Electrical conductors including connection media 80a-80c are used in the paths through which alternating currents flow in the second measurement circuit. The active power measured by the wattmeter 60 includes the DC resistance of this conductor, the contact resistance between the electrodes 70a, 70a', 70b, 70b' and the electromagnetic steel sheet S, the electrodes 70a, 70a', 70b, 70b' And the electrical resistance of the magnetic steel sheet causes measurement errors.

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 as the measurement area WR of the electrical steel sheet S. The value obtained by dividing by the mass is derived as the core loss of the magnetic steel sheet S in the measurement area.
Therefore, the control unit 101 instructs the selector switch 30 to select the DC power output from the 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 101 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 measurement circuit, the DC resistance deriving unit 102 converts the DC voltage value measured by the voltmeter 50 into the DC current value 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. A circuit having the electrodes 70a and 70a' as input terminals is a circuit configured using the electrodes 70a, 70a', 70b and 70b' and the electromagnetic steel sheet S, and the electrodes 70b and 70b' are electrically A connected (shorted in FIG. 1) circuit.

Thereafter, control unit 101 instructs DC power supply 10 to stop outputting DC power. Then, the control unit 101 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 101 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 103 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 value is the area of the measurement region WR of the electromagnetic steel sheet S in the direction perpendicular to the direction in which the magnetic flux penetrates (in the examples shown in FIGS. , and the magnetic flux density, which is the condition for measuring the iron loss, the voltage between the electrodes 70a and 70a' corresponding to the magnetic flux density is derived from 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 103, the iron loss derivation unit 104 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 102, and the mass of the measurement region WR of the electromagnetic steel sheet S, the magnetic steel sheet S The iron loss in the plate thickness direction (Z-axis direction) of the measurement area (plate thickness direction (Z-axis direction) component of the iron loss) is derived. The mass of the measurement region of the magnetic steel sheet S is represented by the product of the volume of the measurement region WR of the magnetic steel sheet S and the density of the magnetic steel sheet.

An example of a specific method of deriving the iron loss in the iron loss derivation unit 104 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 104 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 region WR of the electromagnetic steel sheet S, and calculates the value as It is derived as the iron loss of the measurement area WR of S. Further, the iron loss derivation unit 104 includes the iron loss in the measurement region WR of the electromagnetic steel sheet S, the time when the iron loss in the measurement region WR of the electromagnetic steel sheet S is derived, the position of the measurement region WR of the electromagnetic steel sheet S, are associated with each other and stored.

The iron loss deriving unit 104 uses the AC power (effective power) or the measurement time of the AC current in the ammeter 40 (the time corresponding to the control cycle in which the measured value is obtained) can be used. For example, when the AC power (effective power) measurement value of the power meter 60 and the AC current measurement value of the ammeter 40 are acquired in the same control cycle, the iron loss derivation unit 104 corresponds to the control cycle. can be used as the time at which the iron loss in the measurement region WR of the electromagnetic steel sheet S is derived. Note that the time corresponding to the control cycle is, for example, the start time of the control cycle.

Further, the iron loss derivation unit 104 derives the position of the measurement region WR of the electromagnetic steel sheet S, for example, as follows.
The sensor 110 detects whether or not there is an electromagnetic steel sheet S at the installation position of the sensor 110 . The iron loss derivation unit 104 calculates the time at which the sensor 110 first detects the electromagnetic steel sheet S (the time corresponding to the control cycle at which the sensor 110 first acquires a signal indicating that the electromagnetic steel sheet S has been detected) from the electromagnetic steel sheet S is the time when the tip of the sensor 110 has passed the installation position. Moreover, the sensor 120 detects the conveying speed of the electromagnetic steel sheet S. As shown in FIG. The iron loss deriving unit 104 calculates the installation position of the sensor 110 and the installation position of the sensor 110 at each time (each control cycle) based on the time when the tip of the electromagnetic steel sheet S passes the installation position of the sensor 110 and the conveying speed of the electromagnetic steel sheet S. , and the position of the tip of the electromagnetic steel sheet S in the conveying direction (X-axis direction) of the electromagnetic steel sheet S (see FIG. 5).

Further, the distance X2 in the conveying direction (X-axis direction) of the electromagnetic steel sheet S between the installation position of the sensor 110 and the electrodes 70a′ and 70b′ (contact areas a′ and b′), and the electrodes 70b and 70b′ The distance X3 in the conveying direction (X-axis direction) of the electromagnetic steel sheet S between (contact regions b, b') is known. The distance in the conveying direction (X-axis direction) of the electromagnetic steel sheet S between the installation position of the sensor 110 and the electrodes 70a and 70b (contact areas a and b) is also X2. The distance in the conveying direction (X-axis direction) of the electromagnetic steel sheet S between the regions a and a') is also X3.

At each time (each control cycle), the iron loss derivation unit 104 derives the distance X4 by subtracting the sum of the distance X2 and the distance X3 from the distance X1. At each time (each control cycle), the iron loss derivation unit 104 detects a position separated by a distance X4 along the conveying direction (X-axis direction) of the electromagnetic steel sheet S from the front end position of the electromagnetic steel sheet S to the tail end side. , is derived as the position of the tip of the measurement region WR of the electromagnetic steel sheet S. In addition, at each time (each control cycle), the iron loss deriving unit 104 moves the distance X3 and the distance X4 along the conveying direction (X-axis direction) of the electromagnetic steel sheet S from the front end position of the electromagnetic steel sheet S to the tail end side. is derived as the position of the tail end of the measurement region WR of the electromagnetic steel sheet S.

The iron loss deriving unit 104 calculates the time (control period) when the iron loss of the measurement region WR of the electromagnetic steel sheet S is derived, and the measurement region WR of the electromagnetic steel sheet S at the same time (control cycle) as the time (control cycle). Positions (tip and tail positions) are associated with each other and stored.
As described above, the iron loss derivation unit 104 calculates the iron loss in the measurement region WR of the electromagnetic steel sheet S, the time when the iron loss in the measurement region WR of the electromagnetic steel sheet S is derived, and the measurement region WR of the electromagnetic steel sheet S. can be stored in association with each other.
After the iron loss is derived for all the measurable regions of the electromagnetic steel sheet S as described above, the control unit 101 instructs the AC power supply 20 to stop supplying AC power.

As the sensors 110 and 120, for example, existing ones in the manufacturing line of the electromagnetic steel sheets S can be used. The sensor 110 has, for example, a light emitter and a light receiver. When the light-emitting portion and the light-receiving portion are arranged at positions facing each other in the plate thickness direction (Z-axis direction) of the electromagnetic steel sheet S so as to sandwich the conveying path of the electromagnetic steel sheet S, the light-receiving portion receives the light emitted from the light-emitting portion. is no longer received, it is detected that the electromagnetic steel sheet S has passed the installation position of the sensor 110 . Further, when the light receiving portion is arranged at a position for receiving the reflected light of the light emitted from the light emitting portion, when the light receiving portion receives the light emitted from the light emitting portion, the electromagnetic steel plate S changes the installation position of the sensor 110. Passage will be detected. Moreover, as the sensor 120, a pulse generator connected to a transport roll (not shown) can be used. In this case, the conveying speed of the electromagnetic steel sheet S is detected from the number of pulses per unit time output from the pulse generator. Moreover, the sensors 110 and 120 may be newly installed.

The output unit 105 outputs the iron loss information of the measurement region WR of the electromagnetic steel sheet S derived by the iron loss deriving unit 104 . The output unit 105 outputs time-series data of iron loss in the measurement region WR of the electromagnetic steel sheet S, for example. As the output form, for example, at least one of display on a computer display, storage in a storage medium inside or outside arithmetic device 100, and transmission to an external device can be adopted.

Next, an example of the iron loss measuring method of this embodiment will be described with reference to the flowchart of FIG. In this embodiment, after the process of step S601 is performed, the processes of steps S602 to S606 are repeatedly performed at a predetermined control cycle.

First, in step S601, the DC power supply 10, the AC power supply 20, the changeover switch 30, the ammeter 40, the voltmeter 50, the power meter 60, the electrodes 70a, 70a', 70b, 70b' arithmetic device 100, and the sensors 110, 120 , are arranged as shown in FIG. 1, and the circuit is configured such that a first measurement circuit and a second measurement circuit are configured. Also, the yoke 90 is arranged. At least part of the configuration of this circuit may be done manually. Arrangement of the yoke 90 may also be performed manually. It should be noted that when existing sensors are used as the sensors 110 and 120, the sensors 110 and 120 do not need to be newly arranged.

Next, in step S602, the control unit 101 waits until the electromagnetic steel sheets S come into contact with the electrodes 70a, 70a', 70b, and 70b'. , instructs the DC power supply 10 to output DC power to the first measuring circuit. After the DC power is output from the DC power supply 10 to the first measuring circuit based on the instruction from the control unit 101, the DC resistance deriving unit 102 calculates the value of the DC voltage measured by the voltmeter 50 as A value obtained by dividing 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.

Whether or not the electromagnetic steel sheets S are in contact with the electrodes 70a, 70a′, 70b, and 70b′ is determined by, for example, a sensor that detects the presence or absence of the contact, and the electromagnetic steel sheets S are connected to the electrodes 70a, 70a′, 70b, and 70b′. can be performed by determining whether it is detected that the contact has been made. Further, before the electromagnetic steel sheets S come into contact with the electrodes 70a, 70a', 70b, and 70b', the DC power is output to the first measurement circuit for the DC power supply 10, and the DC current measured by the ammeter 40 is monitoring the value of the electrodes 70a, 70a', 70b, 70b' when the measurement of the DC current measured by the ammeter 40 becomes possible (the value of the DC current exceeds a threshold greater than 0 (zero)). It can be determined that the electromagnetic steel sheet S has come into contact with . Further, it can be determined that the electromagnetic steel sheets S are in contact when the position of the tip of the electromagnetic steel sheet S (position in the X-axis direction) matches the installation position (position in the X-axis direction) of the electrodes 70a and 70a'.

Next, in step S603, based on the instruction from the control unit 101, the output of the DC power from the DC power supply 10 is stopped, and when the AC power is output from the AC power supply 20 to the second measurement circuit, the AC input Adjustment unit 103 adjusts the value of the AC voltage output from AC power supply 20 so that the average value and frequency of the AC voltage measured by voltmeter 50 become target values.

Next, in step S604, the iron loss derivation unit 104 derives the product of the direct current resistance derived in step S602 and the square of the effective value of the alternating current measured by the ammeter 40 as Joule loss.
Next, in step S605, the iron loss deriving unit 104 calculates the value obtained by subtracting the Joule loss derived in step S604 from the value of the AC power (active power) measured by the power meter 60 as the measurement area of the electromagnetic steel sheet S. A value obtained by dividing by the mass of the magnetic steel sheet S is derived as the iron loss of the measurement area of the magnetic steel sheet S. Further, the iron loss derivation unit 104 derives the position of the measurement region WR of the electromagnetic steel sheet S in the current control cycle. Then, the iron loss derivation unit 104 mutually converts the iron loss in the measurement region WR of the electromagnetic steel sheet S, the time corresponding to the current control cycle, and the position of the measurement region WR of the electromagnetic steel plate S in the current control cycle. Store in association.

Next, in step S606, the arithmetic device 100 determines whether or not the processes of steps S602 to S605 have been performed for all the measurable regions of the electromagnetic steel sheet S. As a result of this determination, if the processes of steps S602 to S605 have not been performed for all the measurable regions of the electromagnetic steel sheet S, the process returns to step S602. Then, the processes of steps S602 to S606 are repeatedly executed until the processes of steps S602 to S605 are performed for all the measurable regions of the magnetic steel sheet S.

As described above, in this embodiment, after the process of step S601 is performed, the processes of steps S602 to S606 are repeatedly performed at a predetermined control cycle. However, this need not necessarily be the case. For example, the processing of steps S602 to S606 may be executed based on a measurement instruction from the inspector. Further, the DC resistance in the circuit having the electrodes 70a and 70a' as input terminals does not have to be updated every control cycle. In this case, in step S606, it is determined whether or not the processes of steps S603 to S605 have been performed for all the measurable regions of the electromagnetic steel sheet S. If the processes have been performed, the process proceeds to step S603. to return to

Determination whether or not the processes of steps S602 to S605 have been performed for all the measurable regions of the electromagnetic steel sheet S is performed, for example, by a sensor that detects the presence or absence of contact between the electrodes 70a and 70a′ and the electromagnetic steel sheet S. This can be done by determining whether or not it is detected that the electromagnetic steel sheets S are not in contact with 70a and 70a'. In addition, when the alternating current measured by the ammeter 40 cannot be measured (the effective value of the alternating current is 0 (zero) or less than a threshold exceeding 0 (zero)), all the measurable regions of the electromagnetic steel sheet S , it can be determined that the processing of steps S602 to S605 has been performed. Further, when the position of the tail end of the electromagnetic steel sheet S (the position in the X-axis direction) coincides with the installation position (the position in the X-axis direction) of the electrodes 70b and 70b′, the step It can be determined that the processes of S602 to S605 have been performed.

Then, when it is determined that the processes of steps S602 to S605 have been performed for all the measurable regions of the electromagnetic steel sheet S, the process proceeds to step S607. When the process proceeds to step S607, the output unit 105 outputs the iron loss information of the measurement region WR of the electromagnetic steel sheet S derived in step S603. Further, the control unit 101 instructs the AC power supply 20 to stop supplying AC power. Then, the flow chart of FIG. 6 ends.

As described above, in the present embodiment, the electrodes 70a and 70a' are electrically connected (contacted) to the first end surface of the electromagnetic steel sheet S, and the electrodes 70b and 70b' are electrically connected to the second end surface of the electromagnetic steel sheet S. A circuit configured by using the electrodes 70a, 70a', 70b, 70b', and the electromagnetic steel sheet S, in which the input terminal is between the electrodes 70a and 70a', The electrodes 70b and 70b′ constitute a circuit that is electrically connected, and the magnetic flux generated by flowing an alternating current in the circuit penetrates in the direction perpendicular to the plate surface of the electromagnetic steel sheet S (Z-axis direction), The steel plate S is magnetized in the plate thickness direction. Then, the iron loss in the measurement region WR of the magnetic steel sheet S is derived based on the alternating current flowing through the circuit and the alternating voltage between the electrodes 70a and 70a'. In this manner, since the exciting current is directly applied to the magnetic steel sheet S, no fringing magnetic flux is generated. Therefore, the iron loss characteristic in the direction perpendicular to the surface of the electromagnetic steel sheet S can be accurately measured.

In the present embodiment, the magnetic steel sheet S is excited using a yoke 90 having magnetic pole surfaces 90a and 90b that face the one and the other plate surfaces of the magnetic steel sheet S in the measurement region WR. Therefore, it is possible to reduce the amount of electric power of the AC power supply 20 for setting the average value and frequency of the AC voltage measured by the voltmeter 50 to the target values (that is, the effective value of the excitation current for setting the target values can be reduced, making it easier to excite). In addition, the distribution of the magnetic flux density in the width direction (Y-axis direction) of the electromagnetic steel sheet S can be reduced due to the increased magnetic flux density near the end portions in the width direction (Y-axis direction) of the electromagnetic steel sheet S. . This effect is achieved by making the measurement region WR of the magnetic steel sheet S substantially coincide with the magnetic pole surfaces 90a and 90b when viewed from the direction (Z-axis direction) perpendicular to the surface of the magnetic steel sheet S. become more pronounced.
Further, when viewed from the direction (Z-axis direction) perpendicular to the surface of the electromagnetic steel sheet S, the magnetic pole surfaces 90a and 90b and the measurement area WR of the electromagnetic steel sheet S in the longitudinal direction (X-axis direction) of the electromagnetic steel sheet S The measurement area of the electromagnetic steel sheet S can be clarified by making the and substantially coincide with each other.

Further, in the present embodiment, the electrodes 70a, 70a', 70b, and 70b' slide against the electromagnetic steel sheet S so that their positions do not substantially change. , the electromagnetic steel sheets S and the electrodes 70a, 70a', 70b, 70b' can be suppressed from being worn.

In addition, in this embodiment, the DC resistance in the circuit described above is derived and stored before measuring the core loss. Then, the value obtained by subtracting the Joule loss based on the DC resistance from the active power based on the alternating current flowing in the circuit and the alternating voltage between the electrodes 70a and 70a′ is derived as the iron loss in the measurement area of the electromagnetic steel sheet S. do. Therefore, the iron loss in the measurement region WR of the electrical steel sheet S can be derived with higher accuracy.

<Modification>
In the present embodiment, the case where the electromagnetic steel sheet S is the object to be measured has been described as an example. However, the measurement object of iron loss is not limited to the electromagnetic steel sheet as long as it is a soft magnetic material sheet.
Further, in the present embodiment, the case where the iron loss is measured while the electromagnetic steel sheets S are being conveyed (without stopping the conveying of the electromagnetic steel sheets S) has been described as an example. However, this need not necessarily be the case. For example, when measuring the iron loss of an electromagnetic steel sheet having a square planar shape with a side length of several tens of mm (for example, 50 mm), it is not necessary to convey the electromagnetic steel sheet. In this case, it is preferable to bring the magnetic pole surface of the yoke into contact with the surface of the magnetic steel sheet in the measurement area. Also, it is not necessary to slide the electrodes. Moreover, it is preferable to use a yoke as described above, because it facilitates excitation and reduces the distribution of the magnetic flux density. However, for example, when the object to be measured for iron loss is small, or when the object to be measured for iron loss is a magnetic plate (for example, a strip) other than an electromagnetic steel plate, excitation is easy without using a yoke. Moreover, the distribution of the magnetic flux density may not be so large as to affect the measurement accuracy of iron loss. In such cases, it is not always necessary to use a yoke.

Further, in the present embodiment, the case where the iron loss is measured while the magnetic steel sheet S is flat has been described as an example. However, it is not always necessary to do so (the surface of the electromagnetic steel sheet may be bent). In this case, it is preferable to change the shape of the magnetic pole surface of the yoke in accordance with the shape of the surface of the electromagnetic steel sheet (so that the magnetic pole surface of the yoke and the surface of the electromagnetic steel sheet are substantially parallel). . Alternatively, the electromagnetic steel sheet S wound into a coil may be used as the measurement target (hereinafter, the electromagnetic steel sheet S wound into a coil is referred to as a coil as necessary). When coils are to be measured, it is preferable that the positions in the radial direction of the coils (in the winding thickness direction of the electromagnetic steel sheet) where the electrodes 70a, 70a', 70b, 70b' and the coils come into contact are the same. The fact that the positions of the coils 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 are the same. For example, in the outermost layer of the coil, the electrodes are brought into contact with the end faces in the plate width direction of the electromagnetic steel sheets forming the coil. When a coil is to be measured, the shape of the electrode is, for example, needle-shaped so that the electrode contacts only the end face in the plate width direction of the electromagnetic steel sheet that constitutes the coil. preferably. Moreover, when the coil is the object to be measured, the magnetic flux also penetrates the electromagnetic steel sheet outside the measurement area. For example, when the area of the outermost layer of the coil is to be measured, the magnetic flux penetrates not only the outermost layer of the magnetic steel sheet, but also the innermost layer of the magnetic steel sheet. Therefore, the measured iron loss includes the influence of the magnetic properties of the electrical steel sheet outside the measurement area. However, for example, when performing simple measurement of iron loss, or when evaluating the relative magnitude relationship of iron loss between coils, it is useful to use coils as measurement targets.

Furthermore, if the magnetic steel sheet to be measured is not a flat plate, the iron loss may be corrected according to the curvature of the magnetic steel sheet. For example, the relationship between the curvature radius of the magnetic steel sheet and the iron loss deterioration rate is investigated in advance for each type (steel type) of the magnetic 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 certain radius of curvature, a yoke having a tip end surface with a radius of curvature substantially the same as that of the magnetic steel sheet may be used.

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 electrical steel sheet and the iron loss deterioration rate X in a certain steel type and under certain excitation conditions is obtained. By deriving the relationship between the curvature radius of the magnetic steel sheet and the iron loss deterioration rate in this way by varying the steel type and the excitation conditions, the curvature radius of the magnetic steel sheet can be calculated for each type (steel type) and excitation condition. and the iron loss deterioration rate X can be obtained. The relationship between the radius of curvature of the magnetic steel sheet and the iron loss deterioration rate X may be a formula representing the relationship, or a table storing the curvature radius of the magnetic steel sheet and the iron loss deterioration rate X in association with each other. good. The iron loss derivation unit 104 obtains information indicating the relationship between the curvature radius of the electromagnetic steel sheet 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 of the measurement region of the electromagnetic steel sheet. It is stored (before the flow chart of FIG. 6 starts). A form of acquiring such information includes, for example, reception from an external device, reading from a portable storage medium, and input operation by an inspector, but is not particularly limited.

Prior to the iron loss in the measurement area of the magnetic steel sheet (before the first step S602 in FIG. 6), the inspector determines the type (steel type) of the magnetic steel sheet that constitutes the magnetic steel sheet to be measured, the excitation conditions , and information indicating the radius of curvature of the electromagnetic steel sheet are input to the computing device 100 by operating the user interface of the computing device 100 . The iron loss derivation unit 104 reads the iron loss deterioration rate X corresponding to the information input to the arithmetic unit 100 from information stored in advance. Then, in step S605, the iron loss derivation unit 104 calculates the value obtained by subtracting the Joule loss derived in step S604 from the value of the AC power (active power) measured by the power meter 60 as the mass of the measurement region of the electrical steel sheet. Let W′ [W/kg] be the value obtained by dividing by , W [W/kg] be the iron loss in the measurement area of the electrical steel sheet, and X [%] be the readout iron loss deterioration rate, then the following (1) The iron loss W in the measurement area of the electrical steel sheet is derived from the equation.
W=W'×{1/(1+X/100)} (1)

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 electrical steel sheet S is derived by the following equation (1)' instead of equation (1).
W=W'×(1+X/100) (1)'

Further, in the present embodiment, the case where one electromagnetic steel sheet S is to be measured has been described as an example. However, a plurality of stacked electromagnetic steel sheets may be measured. In this case, each of the four electrodes can be in contact with all of the end faces in the sheet width direction of the plurality of laminated electromagnetic steel sheets. Alternatively, an electrode may be arranged for each layer or layers.

For example, when four electromagnetic steel sheets are to be measured and electrodes are arranged for each layer, four electrodes contact the end surfaces in the sheet width direction of the first layer electromagnetic steel sheets, Four electrodes in contact with the widthwise end surfaces of the second-layer electromagnetic steel sheets, four electrodes in contact with the widthwise end surfaces of the third-layer electromagnetic steel sheets, and the widthwise direction of the fourth-layer electromagnetic steel sheets. can be used. In this case, for example, the four electrodes are electrically connected to the output terminals of the voltmeter 50 and the wattmeter 60 via the connection medium 80a, and the four electrodes are electrically connected to the ground terminal via the connection medium 80b. can be electrically connected to each other via the connection medium 80c.

In addition, when four electromagnetic steel sheets are to be measured and electrodes are arranged for every two layers, 4 contacting end surfaces in the sheet width direction of the first and second layers of the electromagnetic steel sheets It is possible to use one electrode and four electrodes in contact with the end faces in the plate width direction of the third and fourth layers of the electromagnetic steel sheets. In this case, for example, the two electrodes are electrically connected to the output terminals of the voltmeter 50 and the wattmeter 60 via the connection medium 80a, and the two electrodes are electrically connected to the ground terminal via the connection medium 80b. , and two electrodes arranged on opposite sides of the two electrodes can be electrically connected via the connection medium 80c.
Even in the above manner, in the present embodiment, the exciting current can be directly applied to the magnetic steel sheets.

In addition, in the present embodiment, the case where the electrodes 70a, 70a', 70b, and 70b' are electrically contacted with the end faces in the direction perpendicular to the rolling direction (sheet width direction) in the sheet surface direction has been described as an example. . However, if the electrodes are electrically connected to one end face and the other end face in one direction in the plate surface direction, this need not necessarily be the case.

Further, as described above, by subtracting the Joule loss from the active power (active power measured by the wattmeter 60) based on the alternating current flowing in the closed circuit and the alternating voltage between the electrodes 70a and 70a', It is preferable because 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, 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.

(Second embodiment)
Next, a second embodiment will be described. In the first embodiment, the case where the shape of the yoke 90 does not change from the state shown in FIGS. 3 and 4 has been described as an example. A problem in this case will be described.
FIG. 8 is a diagram conceptually showing an example of magnetic flux flowing in the yoke 90 of the first embodiment. FIG. 8, like FIG. 3, is a cross-sectional view taken along the line II of FIG. However, in FIG. 8, hatching is omitted for convenience of notation.

As described in the first embodiment, the magnetic flux generated from the electromagnetic steel sheet S flows from one plate surface of the measurement region WR of the electromagnetic steel plate S through the yoke 90 to the other plate of the measurement region WR of the electromagnetic steel plate S. Flow through the closed magnetic path back to the surface. By doing so, the magnetic path length of the magnetic flux flowing through the closed magnetic path differs in the plate width direction (Y-axis direction) of the electromagnetic steel sheet S. This corresponds to the difference in magnetic resistance in the sheet width direction (Y-axis direction) of the electromagnetic steel sheet S. Therefore, the magnetic flux density is different in the plate width direction (Y-axis direction) of the electromagnetic steel sheet S.

In FIG. 8, the magnetic path 801a of the magnetic flux passing through the region on the positive direction side (electrode 70b side) in the plate width direction (Y-axis direction) of the electromagnetic steel sheet S relatively, and the plate of the electromagnetic steel sheet S relatively The magnetic path 801b of the magnetic flux passing through the area on the negative direction side (electrode 70a side) in the width direction (Y-axis direction) and the area relatively close to the center in the width direction (Y-axis direction) of the electromagnetic steel sheet S Comparing the magnetic path lengths of the magnetic path 801c of the magnetic flux passing through, the magnetic path length of the magnetic path 801a is the shortest, and the magnetic path length of the magnetic path 801b is the longest. In this case, the magnetic resistance in the magnetic path 801b is the highest, and the magnetic resistance in the magnetic path 801a is the lowest. Therefore, the magnetic flux density in the magnetic path 801b is the lowest, and the magnetic flux density in the magnetic path 801a is the highest. Thus, in the example shown in FIG. 8, the magnetic flux density is higher in the region closer to the electrode 70b in the plate width direction (Y-axis direction) of the electromagnetic steel sheet S, and the magnetic flux density is lower in the region closer to the electrode 70a. In order to measure the iron loss with higher accuracy, it is preferable to measure the iron loss in the magnetic steel sheet S under a constant magnetic flux density. Therefore, the difference in the magnetic flux density in the plate width direction (Y-axis direction) of the electromagnetic steel sheet S described above can be a factor in the iron loss measurement error.

Therefore, in the present embodiment, in order to reduce the difference in the magnetic flux density in the plate width direction (Y-axis direction) of the electromagnetic steel sheet S, the distance between the magnetic pole faces of the yokes (the distance between two magnetic pole faces) can be adjusted in the plate width direction (Y-axis direction) of the electromagnetic steel plate S. As described above, the main difference between the present embodiment and the first embodiment is the configuration for adjusting the spacing between the magnetic pole faces of the yoke. 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 in FIGS. 1 to 7, and detailed description thereof is omitted.

FIG. 9 is a diagram showing an example of the configuration of the yoke 910 and the parts attached to the yoke 910. As shown in FIG.
In FIG. 9, a yoke 910 has magnetic pole surfaces 910a and 910b, which are opposed to one and the other plate surfaces of the magnetic steel sheet S in the measurement region WR. The shape and size of the pole faces 910a, 910b are the same as the pole faces 90a, 90b of the first embodiment.

The yoke 910 has a movable yoke portion 911 and a fixed yoke portion 912 . The movable yoke portion 911 and the fixed yoke portion 912 are realized by using a plurality of laminated soft magnetic plates. The soft magnetic plate forming the movable yoke portion 911 and the fixed yoke portion 912 is, for example, a non-oriented magnetic steel plate or a oriented magnetic steel plate.
FIG. 10 is a diagram showing an example of a soft magnetic plate that constitutes the movable yoke portion 911. As shown in FIG.
The movable yoke portion 911 includes a first soft magnetic plate 1010 having a plate surface having the shape shown in FIG. 10(a) and a second soft magnetic plate 1020 having a plate surface having the shape shown in FIG. 10(b). are alternately laminated one by one and fixed.

A through hole 1010 a is formed in the first soft magnetic plate 1010 . The through hole 1010a is formed in a region inside the corner of the first soft magnetic plate 1010 that is located closest to the electrode 70a. A through hole 1020 a is also formed in the second soft magnetic plate 1020 . The through hole 1020a is formed in a region inside the corner of the second soft magnetic plate 1020 that is located closest to the electrode 70a. Through holes 1010a and 1020a have the same shape and size. Further, the distance between the center of gravity of through-hole 1010a and the vertex of the corner of first soft magnetic plate 1010 that is positioned closest to electrode 70a, the center of gravity of through-hole 1020a, and the 2 of the corners of the soft magnetic plate 1020, the distance to the vertex of the corner located closest to the electrode 70a is the same.

When the first soft magnetic plate 1010 and the second soft magnetic plate 1020 are alternately laminated one by one, the through holes 1010a and 1020a and the corners closest to the through holes 1010a and 1020a and match each other. By doing so, a through hole is formed in the movable yoke portion 911 so as to pass through the electromagnetic steel sheet S in the longitudinal direction (X-axis direction).

As shown in FIG. 9 , a shaft 920 is inserted into a through hole formed in the movable yoke portion 911 . A region on one side and a region on the other side in the longitudinal direction (X-axis direction) of the shaft 920 are supported by a support member (not shown) so that the shaft 920 can rotate. The pivot axis of shaft 920 coincides with the axis of the shaft. The outer peripheral surface of the shaft 920 is electrically and magnetically insulated from the movable yoke portion 911 so that the movable yoke portion 911 rotates as the shaft 920 rotates. contact with the surface. For example, the area of the outer peripheral surface of the shaft 920 that contacts the through-hole of the movable yoke portion 911 and the surface of the through-hole of the movable yoke portion 911 are electrically and magnetically insulated and adhered together. Shaft 920 is constructed of, for example, a non-magnetic and non-conductive material.

11A and 11B are diagrams showing an example of a soft magnetic plate that constitutes the fixed yoke portion 912. FIG.
The fixed yoke portion 912 includes a third soft magnetic plate 1110 having a plate surface having the shape shown in FIG. 11(a) and a fourth soft magnetic plate 1010 having a plate surface having the shape shown in FIG. 11(b). are alternately laminated one by one and fixed.

The third soft magnetic plate 1110 can be realized by not forming the through hole 1010a in the first soft magnetic plate 1010 (the third soft magnetic plate 1110 and the first soft magnetic plate 1010 can be only the presence or absence of the through hole 1010a). The fourth soft magnetic plate 1120 can be realized by not forming the through hole 1020a in the second soft magnetic plate 1020 (the fourth soft magnetic plate 1120 and the second soft magnetic plate 1020 can be only the presence or absence of the through hole 1020a).

FIG. 12 is a diagram showing an example of one end surface of the movable yoke portion 911 and the fixed yoke portion 912. As shown in FIG. Specifically, FIG. 12( a ) shows an example of one end surface of the movable yoke portion 911 , and FIG. 12( b ) shows an example of one end surface of the fixed yoke portion 912 . One end faces of the movable yoke portion 911 and the fixed yoke portion 912 shown in FIG. 12 are two end faces of the electromagnetic steel sheet S in the plate width direction (Y-axis direction) that are not connected to the magnetic pole faces 910a and 910b (see FIG. 9). , the end surface located closest to the electrode 70b (positive direction of the Y axis). In the following description, one end surfaces of the movable yoke portion 911 and the fixed yoke portion 912 shown in FIG. 12 are referred to as sliding side end surfaces as necessary.

By alternately laminating the first soft magnetic plate 1010 and the second soft magnetic plate 1020 shown in FIGS. 10(a) and 10(b) one by one as described above, the ), the sliding-side end surface of the movable yoke portion 911 has a comb-like shape. Similarly, by alternately laminating the third soft magnetic plate 1110 and the fourth soft magnetic plate 1120 shown in FIGS. As shown in 12(b), the shape of the end surface of the fixed yoke portion 912 on the sliding side is comb-like.

As shown in FIG. 9, the fixed yoke portion 912 is arranged such that the surface forming the magnetic pole surface 910b of the fixed yoke portion 912 is parallel to the measurement region WR on the lower side of the electromagnetic steel sheet S (the negative direction side of the Z axis). They are positioned so as to face each other and fixed in the positioned position. The term “parallel” here means that it is most preferably completely parallel, but in reality it is not easy to make it completely parallel, so it is sufficient if it is approximately parallel (this also applies to other explanations). is).

When the comb-teeth-shaped protrusions on the sliding-side end surface of the movable yoke portion 911 are completely fitted into the comb-teeth-shaped recessed portions on the sliding-side end surface of the fixed yoke portion 912, the magnetic pole surface of the movable yoke portion 911 is formed. 910a faces each other in parallel with the measurement region WR on the upper side of the electromagnetic steel plate S (positive direction of the Z axis), and the surface forming the magnetic pole surface 910b of the fixed yoke portion 912 and the electromagnetic The shafts 920 inserted into the through-holes of the movable yoke portion 911 are positioned so as to face each other in a parallel state via the steel plate S, and are inserted into the through-holes of the movable yoke portion 911 at the positioned positions. The shaft 920 is supported by a support member (not shown).

FIG. 13 is a diagram showing an example of how the sliding-side end surface of the movable yoke portion 911 and the sliding-side end surface of the fixed yoke portion 912 are fitted together. Specifically, in FIG. 13A, the comb-teeth-shaped protrusions on the sliding-side end face of the movable yoke portion 911 are completely fitted into the comb-teeth-shaped concave regions on the sliding-side end face of the fixed yoke portion 912 . An example of the state of In the state shown in FIG. 9, the sliding side end surface of the movable yoke portion 911 and the sliding side end surface of the fixed yoke portion 912 are in the state shown in FIG. 13(a). In the following description, this state will be referred to as an initial state as required. In the initial state, the yoke 910 and the yoke 90 of the first embodiment are the same in position, size and shape.

When the shaft 920 rotates from the initial state shown in FIG. 9 in the counterclockwise direction (direction from the Y axis to the Z axis) toward the paper surface of FIG. do. Then, as shown in FIG. 13B, the comb-teeth-shaped protrusions on the sliding-side end face of the movable yoke portion 911 slide against the comb-teeth-shaped recesses on the sliding-side end face of the fixed yoke portion 912. A partial area of the comb tooth-shaped protrusion on the sliding side end face of the movable yoke portion 911 is located above (in the positive direction of the Z axis) the comb tooth shaped concave portion on the sliding side end face of the fixed yoke portion 912 . side). FIG. 13B shows an example of a state in which the movable yoke portion 911 is rotated. In the following description, such a state will be referred to as a rotating state as required.

FIG. 14 is a diagram showing an example of the configuration of the yoke 910 and the parts associated with the yoke 910 when the movable yoke portion 911 rotates. When the movable yoke portion 911 rotates, the initial state shown in FIG. 9 changes to the rotated state shown in FIG. In the state shown in FIG. 14, the sliding-side end surface of the movable yoke portion 911 and the sliding-side end surface of the fixed yoke portion 912 are in the state shown in FIG. 13(b).

In the initial state shown in FIG. 9, as in the first embodiment, there is a possibility that a large difference may occur in the magnetic flux density in the sheet width direction (Y-axis direction) of the electromagnetic steel sheet S. 14, the distance between the magnetic pole faces 910a and 910b of the yoke 910 increases in the plate width direction (Y-axis direction) of the electromagnetic steel sheet S in the region closer to the electrode 70b. Therefore, in the rotating state shown in FIG. 14, the magnetic flux increases in the positive direction side (electrode 70b side) in the plate width direction (Y-axis direction) of the electromagnetic steel sheet S compared to the initial state shown in FIG. As the increment of the magnetic path length increases, the area of air included in the magnetic path increases. Therefore, in the rotating state shown in FIG. 14, the magnetic resistance in the region on the positive direction side (electrode 70b side) in the plate width direction (Y-axis direction) of the electromagnetic steel sheet S is higher than in the initial state shown in FIG. , the magnetic flux density is reduced. Therefore, the difference in magnetic flux density in the plate width direction (Y-axis direction) of the electromagnetic steel sheet S is reduced.

In this embodiment, by rotating the movable yoke portion 911 as described above, the difference in magnetic flux density in the plate width direction (Y-axis direction) of the electromagnetic steel plates S can be reduced. An example of a configuration for rotating the movable yoke portion 911 will be described below.

In FIG. 9, the driving device 930 has a base portion 930a, a movable portion 930b, and a holding portion 930c.
The base portion 930a supports the movable portion 930b and the holding portion 930c. The base portion 930a is a mechanism (such as a motor) for moving the movable portion 930b so that the locus of movement of the connection point 930d between the movable portion 930b and the holding portion 930c is substantially parallel to the rotation direction of the movable yoke portion 911. have In FIG. 9, the direction of rotation of the movable yoke portion 911 is indicated by a dashed double-headed arrow. The movable portion 930b can rotate in either the counterclockwise direction or the clockwise direction toward the paper surface of FIG. In this embodiment, in order to simplify the explanation, it is assumed that the movable yoke portion 911 does not have a large rotational range, and the movable portion 930b performs linear motion (the rotational direction of the movable yoke portion 911 shown in FIG. 9 is shown). A case where a dashed double-headed arrow can be approximated by a straight line will be described as an example. In this case, the mechanism for moving the movable portion 930b has, for example, a motor and a ball screw that converts the rotational motion of the motor into linear motion.

A partial area on the lower side of the movable portion 930b (on the negative side of the Z axis) is attached to the above-described mechanism (mechanism for moving the movable portion 930b) of the base portion 930a. In the present embodiment, a partial region on the lower side (negative direction of the Z axis) of the movable portion 930b is attached to, for example, the screw shaft of a ball screw. A partial region of the surface on the upper side (positive side of the Z-axis) of the base portion 930a is open. A region on the upper side (positive direction of the Z axis) of the movable portion 930b is arranged outside the base portion 930b via an open region on the upper surface of the base portion 930b.

The holding portion 930c is connected to the movable portion 930b in a region including the connection point 930d and fixed to the movable portion 930b. The holding portion 930c and the movable portion 930b are adhered, for example. The end surface of the holding portion 930 c is connected to the sliding side end surface of the movable yoke portion 911 while being magnetically and electrically insulated, and is fixed to the movable yoke portion 911 . The holding portion 930c and the movable yoke portion 911 are adhered, for example. The holding portion 930c is made of, for example, a non-magnetic and non-conductive material.

Next, an example of a configuration for controlling the rotating motion of the movable yoke portion 911 will be described.
9, search coils 940a and 940b are arranged in a region between magnetic pole surface 910a of yoke 910 and electromagnetic steel plate S. As shown in FIG. At this time, the search coils 940a and 940b are preferably separated from the magnetic pole faces 910a and 910b of the yoke 910 and the electromagnetic steel plates S. The search coil 940a is relatively arranged on the negative direction side (electrode 70a side) in the sheet width direction (Y-axis direction) of the electromagnetic steel sheet S, and the search coil 940b is relatively arranged in the sheet width direction of the electromagnetic steel sheet S. It is arranged on the positive direction side (electrode 70b side) of the direction (Y-axis direction). Also, the search coils 940a and 940b are arranged with a gap in the width direction (Y-axis direction) of the electromagnetic steel sheet S (the search coils 940a and 940b do not overlap each other).

FIG. 15 is a diagram showing an example of arrangement of search coils 940a and 940b. In FIG. 15, the measurement area WR of the electrical steel sheet S is shown in gray (actually, it is not color-coded as in FIG. 15). 15, illustration of a part of the configuration shown in FIG. 5 is omitted for convenience of notation.
The search coils 940a and 940 are coils that circulate in a virtual plane parallel to the surface of the electromagnetic steel sheet S. As shown in FIG. In this embodiment, to simplify the explanation, it is assumed that the search coils 940a and 940 have the same number of turns, size, and shape. The search coils 940a, 940 can be realized by the same one, for example.

FIG. 15 shows an example in which the search coils 940a and 940b are prevented from protruding from the measurement region WR of the electromagnetic steel sheet S when viewed from the direction (Z-axis direction) perpendicular to the surface of the electromagnetic steel sheet S. List them. 15, the search coils 940a and 940b are symmetrical about a virtual line passing through the center of the electromagnetic steel sheet S in the width direction (Y-axis direction) and extending in the longitudinal direction (X-axis direction) of the electromagnetic steel sheet S. A case where they are arranged at symmetrical positions will be described as an example.

The length of the search coil in the longitudinal direction (X-axis direction) of the electromagnetic steel sheet S is closer to the length of the measurement region WR of the electromagnetic steel sheet S in the longitudinal direction (X-axis direction) of the electromagnetic steel sheet S. It is preferable, 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). This is because the magnetic flux passing through the measurement region WR of the electromagnetic steel sheet S can be detected. This is the same in the plate width direction (Y-axis direction) of the electromagnetic steel sheet S as well.
Further, for example, when viewed from the direction (Z-axis direction) perpendicular to the plate surface of the electromagnetic steel sheet S, the search coil extends from the measurement region WR of the electromagnetic steel sheet S in the longitudinal direction (X-axis direction) of the electromagnetic steel sheet S. It may protrude. This is the same in the plate width direction (Y-axis direction) of the electromagnetic steel sheet S as well.

In this embodiment, the rotation of the movable yoke portion 911 is controlled based on the induced voltage (induced electromotive force) generated by electromagnetic induction in the search coils 940a and 940b arranged as described above when the electromagnetic steel sheet S is excited. control movement.
16A and 16B are diagrams showing an example of a configuration for controlling the rotational movement of the movable yoke portion 911. FIG. In FIG. 16, among the lines connecting each configuration, the dashed-dotted lines indicate information transmission paths within the arithmetic device 160 and between the arithmetic device 160 and the outside, and the solid lines indicate the search coil 940a, 940b and paths (conductors such as electric wires) through which alternating current flows between search coils 940a and 940b and between search coils 940a and 940b and voltmeters 1610 and 1620. FIG. In order to simplify the notation, FIG. 16 illustrates a case where the number of turns of the search coils 940a and 940b is one, but the number of turns of the search coils 940a and 940b may be two or more.

A voltmeter 1610 is arranged between both ends of the search coil 940a and measures an induced voltage _{v a} generated by electromagnetic induction in the search coil 940a when the magnetic steel sheet S is excited. The voltmeter 1620 is arranged between both ends of the search coil 940b and measures an induced voltage _vb generated by electromagnetic induction in the search coil 940b when the magnetic steel sheet S is excited. As described above, in this embodiment, for the sake of simplicity, the case where the induced voltages v _a and v _b generated by electromagnetic induction in the search coils 940a and 940b are individually measured by the voltmeters 1610 and 1620 will be taken as an example. to explain.

Arithmetic device 1630 instructs drive device 930 to operate based on induced voltages v _a and v _b measured by voltmeters 1610 and 1620 . The hardware of the arithmetic device 1630 can be implemented by, for example, the same hardware as the arithmetic device 100 described in the first embodiment. An example of the functions of the computing device 1630 will be described below. Note that the functions of the arithmetic device 1630 may be included in the arithmetic device 100 described in the first embodiment.

The deviation derivation unit 1631 derives the difference between the values of the induced voltages v _a and v _b at the same time. The deviation derivation unit 1631 _{derives a value (=va - vb ) obtained} by subtracting the induced voltage _vb from the induced voltage va. In the following description, the difference between the values of the induced voltages _va and _vb at the same time will be referred to as the deviation of the induced voltages va _{and vb} as required.
As described above, in this embodiment, the search coils 940a and 940b are assumed to have the same number of turns, size, and shape. Also, the absolute values of the induced voltages _va and _vb are proportional to the amount of magnetic flux passing through the search coils 940a and 940b. Therefore, when the amount of magnetic flux passing through the search coils 940a and 940b is the same, the deviation of the induced voltages _va and _vb is zero.

In addition, the fact that the absolute value of the induced voltage v _b is larger than the absolute value of the induced voltage v _a means that relatively This corresponds to the fact that the magnetic flux density in the region is relatively higher than the magnetic flux density in the region on the negative direction side (electrode 70a side) in the plate width direction (Y-axis direction) of the electromagnetic steel sheet S. In this case, as shown in FIG. 14, by moving the movable yoke portion 911 in the upper left direction toward the paper surface of FIG. 70b side) is required to reduce the magnetic flux density.

On the other hand, on the contrary, the fact that the absolute value of the induced voltage v _a is larger than the absolute value of the induced voltage v _b means that the magnetic steel sheet S is relatively negative in the width direction (Y-axis direction). This corresponds to the fact that the magnetic flux density in the region (electrode 70a side) is relatively higher than the magnetic flux density in the region on the positive direction side (electrode 70b side) in the plate width direction (Y-axis direction) of the electromagnetic steel sheet S. . In this case, by moving the movable yoke portion 911 in the lower right direction toward the paper surface of FIG. It is necessary to increase the magnetic flux density.
In the above description, strictly speaking, the upper left direction and the lower right direction are the counterclockwise direction and the clockwise direction, respectively. Since it is supposed to move linearly, the upper left direction and the lower right direction are used here. This also applies to the following description.

When the deviation derivation unit 1631 derives a value obtained by subtracting the induced voltage v _b from the induced voltage v _a (= _va −v _b ) as the deviation of the induced voltages v _a and v _b , the induced voltages v _a and v _b is a negative value (v _a <v _b ), it is necessary to rotate the movable yoke portion 911 counterclockwise toward the paper surface of FIG. On the other hand, when the deviation of the induced voltages v _a and v _b is a positive value (v _a >v _b ), it is necessary to rotate the movable yoke portion 911 clockwise toward the plane of FIG.

Negative feedback control section 1632 derives motor drive voltage Vm by performing negative feedback control so that the deviation of induced voltages _va and _vb becomes a target value (for example, 0). Here, the motor is included in the mechanism for moving the movable portion 930b, and rotates the nut of the ball screw. The negative feedback control section 1632 can perform, for example, PI control as negative feedback control. When the target value is 0, the motor drive voltage Vm(t) at time t is derived, for example, from the following equation (2).
Vm(t)= _Kp ×(0−( _va (t)−vb( _t )))+K _I ∫(0−( _va ( _τ )−vb(τ)))dτ ( 2)
K _p is the proportional gain. _KI is the integral gain. ∫ is the integral symbol with the interval of integration from 0 to t. A positive value of Vm indicates that the movable yoke portion 911 is rotated in the upper left direction as viewed in FIG. 14 . A negative value of Vm(t) indicates that the movable yoke portion 911 is rotated in the lower right direction on the page of FIG.
The method of negative feedback control is not limited to PI control, and a known negative feedback control method can be used.

Negative feedback control unit 1632 outputs to drive device 930 a signal instructing to apply motor drive voltage Vm derived by negative feedback control as a motor excitation voltage. The driving device 930 receives the signal and drives the motor so that the locus of movement of the connection point 930d between the movable portion 930b and the holding portion 930c rotates by the rotation angle based on the signal.

Here, the movable yoke portion 911 is prevented from moving in the lower right direction toward the paper surface of FIG. 9 from the initial state shown in FIG. In order to achieve this, an upper limit value and a lower limit value of the movable range of the movable yoke portion 911 are preset in the driving device 930 . When the driving device 930 moves the movable yoke portion 911 according to the driving voltage Vm(t) based on the signal output from the negative feedback control portion 1632, the position of the movable yoke portion 911 changes within the movable range of the movable yoke portion 911. The movable yoke portion 911 can be made not to move when it deviates from the range determined by the upper limit value and the lower limit value.

Alternatively, the upper and lower limits of the movable range of the movable yoke portion 911 are set in advance in the arithmetic device 1630, and the arithmetic device 1630 identifies the current position of the movable yoke portion 911 from the history of the drive voltage Vm(t). good. In this case, when the arithmetic device 1630 moves the movable yoke portion 911 according to the drive voltage Vm(t) derived by the negative feedback control, the position of the movable yoke portion 911 changes to the movable range of the movable yoke portion 911. When it is out of the range determined by the upper limit and the lower limit, it is possible to output a signal to the driving device 930 so as not to move the position of the movable yoke portion 911 .

Also, in this case, the arithmetic device 1630 may output information indicating that the deviation of the induced voltages v _a and v _b does not reach the target value. As a form of output of the information, for example, at least one of display on a computer display, storage in a storage medium inside or outside the arithmetic unit 1630, and transmission to an external device can be adopted. can.

The iron loss measuring method of the present embodiment is realized by, for example, changing the flow chart of FIG. 6 as follows.
In step S601, the search coils 940a and 940b are also arranged in addition to the arrangement described in the first embodiment. However, instead of arranging the yoke 90, the yoke 910 is initialized. Also, the placement of the driving device 930 is performed.

Further, in step S603, when AC power is output from the AC power supply 20 to the second measurement circuit, the operation of the movable yoke portion 911 is controlled by the computing device 1630, and the AC voltage value is adjusted by the AC input adjustment portion 103. adjustments are made. Instead of doing this, after the end of step S601 and before the start of step S603, AC power is output from the AC power supply 20 to the second measurement circuit, and the movable yoke portion by the arithmetic device 1630 The movement of 911 may be controlled and the position of movable yoke portion 911 may be fixed.

As described above, in the present embodiment, by moving the movable yoke portion 911 to adjust the position of the movable yoke portion 911, the difference in magnetic flux density in the plate width direction (Y-axis direction) of the electromagnetic steel sheet S is reduced. Therefore, in addition to the effect described in the first embodiment, it is possible to reduce the iron loss measurement error caused by the difference in the magnetic flux density in the width direction (Y-axis direction) of the electromagnetic steel sheet S.

<Modification>
In this embodiment, the case where the two search coils 940a and 940b are arranged in the plate width direction (Y-axis direction) of the electromagnetic steel sheet S has been described as an example. However, the number of search coils arranged in the plate width direction (Y-axis direction) of the electromagnetic steel sheet S may be three or more.

Further, in the present embodiment, the case where the negative feedback control is performed so that the deviation of the induced voltages _va and _vb becomes zero has been described as an example. However, this need not necessarily be the case. For example, the magnetic flux density may be derived from the induced voltages v _a and v _b according to Faraday's law of electromagnetic induction, and negative feedback control may be performed so that the derived magnetic flux density difference becomes a target value (for example, 0). In this case, at least one of the number of turns, size, and shape of search coils 940a and 940b may be different.

Further, in the present embodiment, the case where the movable portion 930b moves linearly has been described as an example. However, it is not always necessary to do so, and the movable portion 930b may rotate so as to coincide with the rotating direction of the rotating shaft 920 . In this case, for example, the area on the lower side of the movable portion 930b (on the negative side of the Z axis) extends in the radial direction of the motor arranged so that the rotation axis is parallel to the rotation axis 920. The area above the movable portion 930b is bent so as to be bent. A rotating shaft of the motor is attached to a region on the tip side of the bent region. In this manner, the movable portion 930b rotates so as to match the rotation direction of the rotation shaft 920 according to the rotation angle of the motor. In addition, it is preferable to determine the length of the bent region in the longitudinal direction so that the radius of rotation of the movable portion 930 b is the same as the radius of rotation of the movable yoke portion 911 .

Further, in the present embodiment, the case where the movable yoke portion 911 is automatically moved by automatic control has been described as an example. In this way, for example, even if electromagnetic steel sheets S of different steel types are continuously conveyed, the difference in magnetic flux density in the sheet width direction (Y-axis direction) of the electromagnetic steel sheets S can be reduced as much as possible. Therefore, it is preferable. However, this need not necessarily be the case. For example, for each steel type of the electromagnetic steel sheet S to be measured, the position of the movable yoke portion 911 that makes the deviation of the induced voltages v _a and v _b zero is investigated in advance, and the iron loss of the electromagnetic steel sheet S to be measured is determined. Depending on the type of steel, the movable yoke portion 911 may be rotated to the investigated position. In this case, the rotation of the movable yoke portion 911 may be performed automatically or manually.

Also, in the present embodiment, the case where the yoke 910 has two yoke portions (the movable yoke portion 911 and the fixed yoke portion 912) that are magnetically coupled to each other has been described as an example. However, it is not always necessary for the yoke to have a plurality of yoke portions. For example, when the electromagnetic steel sheet S to be measured for iron loss is of one type, the following may be performed. First, for the magnetic steel sheet S to be measured for iron loss, the interval between the magnetic pole faces in the width direction (Y-axis direction) of the magnetic steel sheet S so that the deviation of the induced voltages v _a and v _b is zero is investigated. Then, a plurality of soft magnetic plates are laminated so that the shape of the region that becomes the magnetic pole surface is the same as the interval, and the shape of the plate surface is changed from the shape shown in FIG. The yoke is constructed by

Further, in the present embodiment, only one yoke portion (movable yoke portion 911) of the two yoke portions (movable yoke portion 911 and fixed yoke portion 912) that are magnetically coupled to each other is moved to move the magnetic steel sheets S. The case of adjusting the interval between the magnetic pole faces in the plate width direction (Y-axis direction) has been described as an example. However, the two yoke portions may be moved to adjust the interval between the magnetic pole faces in the plate width direction (Y-axis direction) of the electromagnetic steel plate S.

Further, in the present embodiment, the interval between the magnetic pole faces 910a and 910b of the yoke 910 changes continuously in the plate width direction (Y-axis direction) of the electromagnetic steel plate S (the plate width direction (Y-axis direction) of the electromagnetic steel plate S The case of adjusting the interval between the magnetic pole faces 910a and 910b of the yoke 910 has been described as an example. However, this need not necessarily be the case. For example, the magnetic pole faces 910a and 910b of the yoke 910 may have the same spacing at a plurality of positions in the plate width direction (Y-axis direction) of the electromagnetic steel sheet S.

That is, a first region in the plate width direction (Y-axis direction) of the electromagnetic steel plate S and a region in the plate width direction (Y-axis direction) of the electromagnetic steel plate S that satisfy the following first condition and second condition: 2nd area|region should just be included. The first condition is that when the electromagnetic steel sheet S is excited, the magnetic path length of the closed magnetic path of the magnetic flux passing through the first region in the sheet width direction (Y-axis direction) of the electromagnetic steel sheet S is longer than that of the electromagnetic steel sheet S. The condition is that it is shorter than the magnetic path length of the closed magnetic path of the magnetic flux passing through the second region in the plate width direction (Y-axis direction). The second condition is that the first region in the plate width direction (Y-axis direction) of the electromagnetic steel plate S is closer to the magnetic pole of the yoke than the second region in the plate width direction (Y-axis direction) of the electromagnetic steel plate S. The condition is that the distance between the faces is long.

Moreover, it is more preferable to satisfy the following third condition. The third condition is that even if any region in the plate width direction (Y-axis direction) of the electromagnetic steel sheet S is defined as the first region, the distance between the magnetic pole faces in all the regions closer to the second region than the first region is is not less than the distance between the pole faces in the first region.
The example shown in FIG. 14 is an example in which the first condition and the second condition are satisfied regardless of which region in the plate width direction (Y-axis direction) of the electromagnetic steel sheet S is set as the first region and the second region. be. In this case, the third condition is automatically met.
Also, in this embodiment, various modifications described in the first embodiment can be adopted.

(Other modifications)
Among the embodiments of the present invention described above, the processing performed by the arithmetic devices 100 and 1630 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 the circuit in the arrangement shown in FIG. 1 (step S601 in FIG. 6).
The first direction of the soft magnetic plate is realized by using the plate width direction (Y-axis direction) of the electromagnetic steel plate S, for example.
One side surface of the soft magnetic plate in the first direction is, for example, the first end surface of the electromagnetic steel sheet S (the end surface of the electromagnetic steel sheet S in the plate width direction, the end surface of the side that contacts the electrode 70a). It is realized by
The second direction perpendicular to the first direction is realized by using the longitudinal direction (X-axis direction) of the magnetic steel sheet S, for example.
A predetermined distance is realized, for example, by using the distance x.
The first electrode and the second electrode are realized by using electrodes 70a and 70a', for example.
The other side surface of the soft magnetic plate in the first direction is, for example, the second end surface of the electromagnetic steel sheet S (the end surface of the electromagnetic steel sheet S in the plate width direction, the end surface opposite to the first end surface) ).
A circuit configured using the first electrode, the second electrode, the third electrode, the fourth electrode, and the soft magnetic plate, wherein the first electrode and the second electrode A circuit in which the third electrode and the fourth electrode are electrically connected to each other using the electrode of the input terminal, for example, the electrode 70a, the electrode 70a', the electrode 70b, the electrode 70b', and the electromagnetic steel sheet S 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 iron loss deriving process is realized by steps S603 to S605 in FIG. 6, for example.
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. Corresponds to the area shown in gray in FIG.
<Claim 2, 13>
The yoke arrangement step is implemented by, for example, arranging the yoke 90 as shown in FIGS. 3 and 4 (step S601 in FIG. 6).
The first magnetic pole face and the second magnetic pole face are realized by using the magnetic pole faces 90a and 90b, for example.
As described in the modified example of the first embodiment, the magnetic pole surface may be in contact with the surface of the measurement area of the soft magnetic plate.
<Claim 3, 14>
The yoke is arranged so that the measurement areas of the first magnetic pole surface, the second magnetic pole surface, and the soft magnetic plate substantially match when viewed from the plate thickness direction of the soft magnetic plate. That is, for example, when viewed from the direction (Z-axis direction) perpendicular to the surface of the electromagnetic steel sheet S, the magnetic pole surfaces 90a and 90b substantially coincide with the measurement area WR of the electromagnetic steel sheet S (XY coordinates are substantially the same).
<Claim 4, 15>
Deriving the iron loss in the plate thickness direction of the measurement region of the soft magnetic plate in a state where the first region and the second region exist in the first direction is, for example, in step S603, When AC power is output from the AC power supply 20 to the second measurement circuit, the operation of the movable yoke portion 911 is controlled by the computing device 1630, and the value of the AC voltage is adjusted by the AC input adjustment portion 103. This corresponds to the derivation of the iron loss in the measurement region of the electromagnetic steel sheet S in subsequent step S605.
The first region and the second region are, for example, regions in the sheet width direction (Y-axis direction) of the electromagnetic steel sheet S between the magnetic pole faces 910a and 910b, and relatively in the sheet width direction of the electromagnetic steel sheet S. It corresponds to a region on the positive direction side (electrode 70b side) and a region on the negative direction side (electrode 70a side) of (Y-axis direction). As shown in the modification of the second embodiment, the configuration of the regions between the magnetic pole faces is not limited to that shown in FIG.
<Claim 5, 16>
Regardless of which region in the first direction is defined as the first region, the first magnetic pole face and the second magnetic pole face in all regions closer to the second region than the first region. is not less than the distance between the first magnetic pole surface and the second magnetic pole surface in the first region, for example, in FIG. In any region, the spacing between the pole faces 910a and 910b in the region is less than the spacing between the pole faces 910a and 910b on the negative direction side in the plate width direction (Y-axis direction) of the electromagnetic steel sheet S from the region. not correspond to As shown in the modified example of the second embodiment, there may be regions in which the distance between the magnetic pole faces 910a and 910b is the same in the plate width direction (Y-axis direction) of the magnetic steel sheet S.
<Claim 6>
The driving step corresponds to, for example, the operation of the movable yoke portion 911 being controlled by the arithmetic unit 1630 in step S603.
The first yoke portion and the second yoke portion are realized by using the movable yoke portion 911 and the fixed yoke portion 912, for example. As shown in the modified example of the second embodiment, both of the two yoke portions may be moved.
<Claim 7, 18>
The search coil arrangement step is realized by, for example, arranging search coils 940a and 940b as shown in FIGS. 9, 15 and 16 (step S601 in FIG. 6). As shown in the modified example of the second embodiment, the number of search coils is not limited to two.
At least one of the first yoke portion and the second yoke portion may be moved based on an induced voltage generated by electromagnetic induction in the plurality of search coils when AC power is supplied to the input terminal. For example, in step S603, when AC power is output from the AC power supply 20 to the second measurement circuit, this corresponds to the operation of the movable yoke portion 911 being controlled by the arithmetic device 1630. FIG.
<Claim 8, 19>
Deriving the iron loss in the plate thickness direction of the measurement area of the soft magnetic plate in a flat state is, for example, the magnetic steel plate S in a flat state in the direction of the white arrow line (the positive direction of the X axis ) is energized while being conveyed, and iron loss is measured.
<Claims 9 and 20>
sliding the first electrode, the second electrode, the third electrode, and the fourth electrode relative to the soft magnetic plate so that their positions are substantially unchanged; For example, the electrodes 70a, 70a', 70b, 70b' correspond to sliding relative to the electromagnetic steel plate S so that their positions (XYZ coordinates) do not substantially change.
<Claim 10>
The DC resistance derivation step is realized by step S602 in FIG. 6, for example.
The joule loss deriving step is realized by step S604 in FIG. 6, for example.
<Claims 11 and 22>
The ratio of the predetermined distance to the distance from one side surface to the other end surface of the soft magnetic plate in the first direction is 6 or more, for example, for the plate width y of the electromagnetic steel plate S, the electrode This corresponds to the fact that the ratio of the distance x (=x/y) between 70a and 70a' (contact regions a and a') is 6 or more.
<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 104, for example.
<Claim 17>
The driving means is realized by using the driving device 930, for example.
<Claim 21>
A DC power supply means is realized by using a DC power supply 10, for example.
The DC resistance deriving means is realized by using the DC resistance deriving section 102, for example.

10: DC power supply, 20: AC power supply, 30: Changeover switch, 40: Ammeter, 50: Voltmeter, 60: Power meter, 70a, 70a', 70b, 70b': Electrodes, 90, 910: Yoke, 100, 1630: Arithmetic unit, 101: Control unit, 102: DC resistance derivation unit, 103: AC input adjustment unit, 104: Iron loss derivation unit, 105: Output unit, 911: Movable yoke unit, 912: Fixed yoke unit, 920: Shaft, 930a, 930b: search coil, 930: drive device, 1631: deviation lead-out section, 1632: negative feedback control section, a to b: contacts

Claims (22)

An iron loss measuring method for measuring the iron loss of a soft magnetic plate,
A first electrode and a second electrode are brought into contact with one side surface of the soft magnetic plate in the first direction with a predetermined distance therebetween in the second direction perpendicular to the first direction, and , a third electrode and a fourth electrode are brought into contact with the other side surface of the soft magnetic plate in the first direction with a predetermined distance in the second direction, the first electrode, A circuit configured by using the second electrode, the third electrode, the fourth electrode, and the soft magnetic plate, wherein the first electrode and the second electrode are input terminals , a circuit configuration step of configuring a circuit in which the third electrode and the fourth electrode are electrically connected;
AC power is supplied to the input terminal, and an AC voltage applied between the first electrode and the second electrode and an AC current flowing in the circuit are used to measure the area of the soft magnetic plate. and an iron loss derivation step of deriving the iron loss in the plate thickness direction of
The measurement area of the soft magnetic plate 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,
A method for measuring iron loss, wherein the soft magnetic plate is magnetized in a plate thickness direction by an alternating current flowing through the circuit. further comprising a yoke arranging step of arranging a yoke magnetically coupled to the measurement area of the soft magnetic plate;
the yoke has a first magnetic pole face and a second magnetic pole face spaced apart from and opposed to the first magnetic pole face;
The first magnetic pole face faces one surface of the measurement region of the soft magnetic plate with a contact or a gap,
2. The method of measuring iron loss according to claim 1, wherein the second magnetic pole face faces the other surface of the measurement area of the soft magnetic plate with a contact or a gap therebetween. In the yoke arrangement step, when viewed from the thickness direction of the soft magnetic plate, the measurement areas of the first magnetic pole surface, the second magnetic pole surface, and the soft magnetic plate are substantially aligned. 3. The iron loss measuring method according to claim 2, wherein the yoke is arranged in a direction of . In the iron loss deriving step, in a state in which a first region and a second region are present between the first magnetic pole face and the second magnetic pole face in the first direction, the soft magnetic Deriving the iron loss in the plate thickness direction of the measurement area of the body plate,
When the soft magnetic plate is excited, the closed magnetic path length of the magnetic flux passing through the first region is shorter than the closed magnetic path length of the magnetic flux passing through the second region, and 4. The iron according to claim 2 or 3, wherein the distance between the first magnetic pole face and the second magnetic pole face is longer in the first region than in the second region. Loss measurement method. Regardless of which region in the first direction is defined as the first region, the first magnetic pole face and the second magnetic pole face in all regions closer to the second region than the first region. 5. The iron loss measuring method according to claim 4, wherein the distance between the first magnetic pole face and the second magnetic pole face in the first region is not less than the distance between the first magnetic pole face and the second magnetic pole face. further comprising a driving step of driving the yoke;
The yoke has a first yoke portion having the first magnetic pole surface and a second yoke portion having the second magnetic pole surface,
the first yoke portion and the second yoke portion are magnetically coupled,
In the driving step, the first region and the second region are formed in the first direction by moving at least one of the first yoke portion and the second yoke portion. The iron loss measuring method according to claim 4 or 5, characterized in that: further comprising a search coil arranging step of arranging a plurality of search coils between the first magnetic pole face and the second magnetic pole face so as to be spaced apart in the first direction;
In the driving step, at least the first yoke portion and the second yoke portion are driven based on an induced voltage generated by electromagnetic induction in the plurality of search coils when AC power is supplied to the input terminal. 7. The iron loss measuring method according to claim 6, wherein said first region and said second region are formed in said first direction by moving one of them. The iron loss measurement according to any one of claims 1 to 7, wherein in the iron loss deriving step, the iron loss in the plate thickness direction of the measurement region of the soft magnetic plate in a flat state is derived. Method. In the iron loss derivation step, the iron loss in the plate thickness direction of the measurement area of the soft magnetic plate being conveyed is derived,
The first electrode, the second electrode, the third electrode, and the fourth electrode slide relative to the soft magnetic plate so that their positions are substantially unchanged. The iron loss measuring method according to any one of claims 1 to 8. 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,
10. The iron loss deriving step according to any one of claims 1 to 9, wherein the Joule loss of the circuit is further used to derive the iron loss in the plate thickness direction of the measurement region of the soft magnetic plate. Iron loss measurement method described in. 11. The ratio of the predetermined distance to the distance from one side surface of the soft magnetic plate to the other end surface in the first direction is 6 or more, according to any one of claims 1 to 10. Iron loss measurement method described in. An iron loss measurement system for measuring the iron loss of a soft magnetic plate,
A first electrode and a second electrode, which are in contact with one side surface of the soft magnetic plate in the first direction with a predetermined distance therebetween in a second direction perpendicular to the first direction. ,
a third electrode and a fourth electrode that are in contact with the other side surface of the soft magnetic plate in the first direction with a predetermined distance in the second direction;
A circuit configured using the first electrode, the second electrode, the third electrode, the fourth electrode, and the soft magnetic plate, wherein the first electrode and the second electrode AC power supply means for supplying AC power to a circuit in which the electrode is an input terminal and the third electrode and the fourth electrode are electrically connected;
Using the AC voltage applied between the first electrode and the second electrode and the AC current flowing in the circuit, the iron loss in the plate thickness direction of the measurement area of the soft magnetic plate is derived. and iron loss derivation means,
The measurement area of the soft magnetic plate 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,
An iron loss measurement system, wherein the soft magnetic plate is magnetized in a plate thickness direction by an alternating current flowing through the circuit. further comprising a yoke magnetically coupled to the measurement area of the soft magnetic plate;
the yoke has a first magnetic pole face and a second magnetic pole face spaced apart from and opposed to the first magnetic pole face;
The first magnetic pole face faces one surface of the measurement region of the soft magnetic plate with a contact or a gap,
13. The iron loss measuring system according to claim 12, wherein the second magnetic pole face faces the other surface of the measurement area of the soft magnetic plate with a contact or a gap therebetween. 13. The measurement areas of the first magnetic pole face, the second magnetic pole face, and the soft magnetic plate substantially coincide when viewed from the plate thickness direction of the soft magnetic plate. The iron loss measurement system described in . The iron loss deriving means is configured to generate the soft magnetic core in a state where a first region and a second region are present between the first magnetic pole surface and the second magnetic pole surface in the first direction. Deriving the iron loss in the plate thickness direction of the measurement area of the body plate,
When the soft magnetic plate is excited, the closed magnetic path length of the magnetic flux passing through the first region is shorter than the closed magnetic path length of the magnetic flux passing through the second region, and 15. The iron according to claim 13 or 14, wherein the distance between the first magnetic pole face and the second magnetic pole face is longer in the first region than in the second region. loss measurement system. Regardless of which region in the first direction is defined as the first region, the first magnetic pole face and the second magnetic pole face in all regions closer to the second region than the first region. is no less than the spacing between the first pole face and the second pole face in the first region. further comprising driving means for driving the yoke;
The yoke has a first yoke portion having the first magnetic pole surface and a second yoke portion having the second magnetic pole surface,
the first yoke portion and the second yoke portion are magnetically coupled,
The driving means moves at least one of the first yoke portion and the second yoke portion to form the first region and the second region in the first direction. 17. The iron loss measurement system according to claim 15 or 16, characterized in that The driving means drives at least one of the first yoke portion and the second yoke portion based on an induced voltage generated by electromagnetic induction in the plurality of search coils when AC power is supplied to the input terminal. so that the first region and the second region are formed in the first direction by moving
18. The method according to claim 17, wherein the plurality of search coils are arranged between the first magnetic pole surface and the second magnetic pole surface so as to be spaced apart in the first direction. Iron loss measurement system as described. The iron loss measurement according to any one of claims 12 to 18, wherein the iron loss deriving means derives the iron loss in the plate thickness direction of the measurement area of the soft magnetic plate in a flat state. system. The iron loss deriving means derives the iron loss in the plate thickness direction of the measurement area of the soft magnetic plate being conveyed,
The first electrode, the second electrode, the third electrode, and the fourth electrode slide relative to the soft magnetic plate so that their positions are substantially unchanged. The iron loss measurement system according to any one of claims 12 to 19. 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 The iron according to any one of claims 12 to 20, wherein the iron loss in the plate thickness direction of the measurement region of the soft magnetic plate is derived by further using Joule loss based on the DC resistance of loss measurement system. 22. The ratio of the predetermined distance to the distance from one side surface of the soft magnetic plate to the other end surface in the first direction is 6 or more, according to any one of claims 12 to 21. The iron loss measurement system described in .

Images