JP7067403B2 - Iron loss measuring device and measurement control device - Google Patents

Description

The disclosure by this specification relates to an iron loss measuring device and a measuring control device.

As an iron loss measuring device for measuring iron loss of a measurement target, for example, Patent Document 1 discloses a measuring device for measuring iron loss with a stator core of the motor as a measurement target in a state where the motor is operated. .. This measuring device has a detector attached to an electric motor and a signal processing device connected to the detector via a lead wire. This signal processing device calculates each time waveform of magnetic field strength and magnetic flux density using the signal input from the detector, and compares each of these time waveforms with the reference waveform to calculate the iron loss of the stator core. do.

Japanese Unexamined Patent Publication No. 2007-189767

By the way, it is assumed that the motor after shipment is used under the condition that the time waveform of the magnetic field strength and the magnetic flux density becomes high frequency. On the other hand, in Patent Document 1, it is considered that the iron loss of the stator core under these usage conditions can be measured by operating the motor assuming the usage conditions after shipment. However, as the time waveform of the magnetic field strength and the magnetic flux density becomes higher in frequency, there is a concern that an error occurs in the input signal to the signal processing device due to a response delay in the lead wire and the like, and the detection accuracy of iron loss decreases.

A main object of the present disclosure is to provide an iron loss measuring device and a measurement control device capable of improving the measurement accuracy of iron loss.

In order to achieve the above object, the disclosed first aspect is
An iron loss measuring device (10) for measuring the iron loss of the measurement target (M).
An exciting unit (26) that generates a magnetic flux whose direction changes in a predetermined cycle and applies the magnetic flux to the measurement target.
A heat flow sensor (30) that is attached to the measurement target and outputs a detection signal according to the heat flow generated in the measurement target due to the generation of magnetic flux in the excitation section.
It is an iron loss measuring device equipped with.

According to the first aspect, the heat flow generated in the measurement target due to the application of the magnetic flux to the measurement target is detected by the heat flow sensor. In this configuration, the iron loss can be measured by using the detection signal of the heat flow sensor by utilizing the correlation between the iron loss generated in the measurement target and the heat flow. Moreover, the heat flow generated in the measurement target is not easily affected by the period of the magnetic flux applied to the measurement target. Therefore, the accuracy of iron loss measurement can be improved by using a heat flow for iron loss measurement.

The second aspect is
An exciting unit (26) that generates a magnetic flux whose direction changes in a predetermined cycle and applies the magnetic flux to the measurement target (M).
A heat flow sensor (30) that outputs a detection signal according to the heat flow generated in the measurement target due to the generation of magnetic flux in the excitation part while attached to the measurement target.
It is a measurement control device (16) that controls the iron loss measurement device (10) provided with the above.
It is a measurement control device including an iron loss calculation unit (S109, S110) that calculates an iron loss (P) to be measured by using a detection signal of a heat flow sensor.

According to the second aspect, the iron loss of the measurement target is calculated by using the detection signal of the heat flow sensor by utilizing the correlation between the iron loss generated in the measurement target and the heat flow emitted from the measurement target. Will be done. Therefore, similarly to the first aspect, the accuracy of iron loss measurement can be improved by using a heat flow for iron loss measurement.

It should be noted that the scope of claims and the reference numerals in parentheses described in this section merely indicate the correspondence with the specific means described in the embodiments described later, and do not limit the technical scope of the present disclosure. not.

The schematic diagram which shows the structure of the iron loss measuring apparatus in 1st Embodiment. The enlarged view around the heat flow sensor in FIG. FIG. 2 is a sectional view taken along line III-III of FIG. The flowchart which shows the procedure of iron loss measurement processing. The schematic diagram which shows the structure of the iron loss measuring apparatus in 2nd Embodiment. FIG. 5 is a sectional view taken along line VI-VI of FIG. FIG. 5 is a sectional view taken along line VII-VII of FIG. The figure which shows the equivalent circuit about heat about the object to be measured and the excitation coil. The figure which shows the change mode of the sensor voltage with respect to time. The schematic diagram which shows the structure of the iron loss measuring apparatus in 3rd Embodiment. FIG. 10 is a sectional view taken along line XI-XI of FIG. The figure for demonstrating the method of mounting a coil member to a heat flow sensor. Schematic cross-sectional view for explaining a method of mounting a coil member on a heat flow sensor. The enlarged view around the heat flow sensor in the modification 1. The enlarged view around the heat flow sensor in the modification 2. The enlarged view around the heat flow sensor in the modification 3. The enlarged view around the heat flow sensor in the modification 4.

Hereinafter, a plurality of embodiments of the present disclosure will be described with reference to the drawings. By assigning the same reference numerals to the corresponding components in each embodiment, duplicate description may be omitted. When only a part of the configuration is described in each embodiment, the configuration of the other embodiment described above can be applied to the other parts of the configuration. Further, not only the combination of the configurations specified in the description of each embodiment but also the configurations of a plurality of embodiments can be partially combined even if the combination is not specified. Further, an unspecified combination of the configurations described in the plurality of embodiments and modifications is also disclosed by the following description.

(First Embodiment)
The iron loss measuring device 10 shown in FIG. 1 measures the iron loss of the measured body M with the measured body M formed of a magnetic material such as iron as a measurement target. The body M to be measured is a member that forms an iron core such as a stator core and a rotor core in a rotary electric machine. The body M to be measured is not formed into the shape of the stator core or the rotor core, and is a member dedicated to measurement having a different shape from the stator core or the rotor core. The body M to be measured is formed in a rectangular plate shape by, for example, an electromagnetic steel plate. The rotary electric machine is used as a generator or a motor in a vehicle, for example.

The iron loss measuring device 10 includes a measuring unit 11, a power supply unit 13, a heat flow meter 14, a magnetic flux meter 15, and a controller 16.

The measuring unit 11 has a joint iron portion 21, an exciting coil 26, a magnetic flux detection coil 27, and a heat flow sensor 30. The joint iron portion 21 is formed of a magnetic material such as iron. The joint iron portion 21 extends in a C shape so as to surround the center line CL. The center line CL is the center line of the joint iron portion 21. The joint iron portion 21 can also be referred to as a joint iron or a yoke.

In the present embodiment, as shown in FIGS. 2 and 3, the direction in which the center line CL extends is referred to as the axial direction α, and the direction orthogonal to the axial direction α is referred to as the radial direction β, along the circumference of the center line CL. The extending direction is called the circumferential direction γ. Assuming a linear virtual line extending in the radial direction β through the center line CL, the axial direction α, the radial direction β, and the circumferential direction γ are orthogonal to each other at the virtual points on this virtual line.

As shown in FIG. 1, the joint iron portion 21 extends in the circumferential direction γ, and the magnetic flux is passed in this circumferential direction γ. The joint iron portion 21 is not completely annular and has a pair of end faces 22a and 22b. The pair of end faces 22a and 22b face each other in a state of being separated from each other in the circumferential direction γ. In the joint iron portion 21, a portion where the pair of end faces 22a and 22b are separated from each other is a gap 23. The pair of end faces 22a and 22b extend in parallel with each other.

The exciting coil 26 generates a magnetic flux as the exciting coil 26 is energized, and forms a magnetic field. The exciting coil 26 is formed by winding an electric wiring around a joint iron portion 21. This electrical wiring has a long conductor and an insulating coating that covers the outer peripheral surface of the conductor. The exciting coil 26 is wound around a portion of the joint iron portion 21 opposite to the gap 23 with the center line CL interposed therebetween. The exciting coil 26 corresponds to the exciting portion. Further, the exciting coil 26 can also be referred to as an exciting winding.

The magnetic flux detection coil 27 is formed by winding an electric wiring around a joint iron portion 21. This electrical wiring has a long conductor and an insulating coating that covers the outer peripheral surface of the conductor. When a magnetic field is generated by energizing the exciting coil 26, an induced current due to electromagnetic induction flows through the magnetic flux detection coil 27. In the magnetic flux detection coil 27, a voltage or a current corresponding to the magnetic flux passing through the joint iron portion 21, the heat flow sensor 30, and the object M to be measured is generated. The magnetic flux detection coil 27 corresponds to a magnetic flux sensor that detects the magnetic flux applied to the heat flow sensor 30. The magnetic flux detection coil 27 can also be referred to as a magnetic flux detection unit.

The joint iron portion 21 has a pair of straight portions 24a and 24b extending straight in a direction orthogonal to the radial direction β. The straight portions 24a and 24b are provided at positions separated from each other in the circumferential direction γ. The center line CL is arranged between these straight portions 24a and 24b. The excitation coil 26 is wound around one straight portion 24a, and the magnetic flux detection coil 27 is wound around the other straight portion 24b. The other straight portion 24b is divided into two in the circumferential direction γ, and the gap 23 is a space for separating these two portions.

The heat flow sensor 30 is a heat flow detecting unit that detects the heat flow generated in the measured body M due to the heat generation of the measured body M. The heat flow sensor 30 outputs a detection signal according to the heat flow from the object M to be measured. The detection signal of the heat flow sensor 30 includes information indicating a voltage value corresponding to the heat flow in the object M to be measured. The heat flow sensor 30 is easy to pass magnetic flux. In other words, the heat flow sensor 30 is difficult to cut off the magnetic flux. The heat flow can be referred to as a heat flux, and the heat flow sensor 30 can be referred to as a heat flux sensor or a heat flux detection unit.

Inside the heat flow sensor 30, an accommodation space 30a for accommodating the object to be measured M is provided. The accommodation space 30a is not open to the outside of the heat flow sensor 30, but is a closed space closed by the heat flow sensor 30. In the state where the object to be measured M is accommodated in the accommodation space 30a, the entire object M to be measured is covered by the heat flow sensor 30. The shape of the accommodation space 30a is a rectangular plate shape that matches the shape of the object to be measured M. The inner surface of the heat flow sensor 30 extends along the outer surface of the object M to be measured, and in the portion where the inner surface and the outer surface face each other, the inner surface and the outer surface are parallel to each other. The separation distance between the inner surface of the heat flow sensor 30 and the outer surface of the object to be measured M is smaller than the thickness dimension of the thinnest portion of the heat flow sensor 30.

The heat flow sensor 30 has a support portion that supports the object to be measured M in the accommodation space 30a. This support portion extends from the heat flow sensor 30 toward the accommodation space 30a. In a state where the support portion supports the object to be measured M, the object to be measured M is held at a position separated from the heat flow sensor 30.

The heat flow sensor 30 is installed in the gap 23 in a state of accommodating the object to be measured M. That is, the object to be measured M is installed in the gap 23. The body M to be measured is housed in the gap 23 so as not to protrude from the gap 23. In this case, the body M to be measured does not protrude outward from the peripheral edges of the end faces 22a and 22b of the joint iron portion 21 in the direction orthogonal to the circumferential direction γ. The heat flow sensor 30 has a mounting portion to be mounted on the joint iron portion 21. This mounting portion extends outward from the heat flow sensor 30. In the state where this mounting portion is mounted on the joint iron portion 21, the heat flow sensor 30 is held at a position separated from the end faces 22a and 22b of the joint iron portion 21. The mounting portion may be provided on the joint iron portion 21.

As shown in FIGS. 1 and 2, the heat flow sensor 30 has a first sensor member 31 and a second sensor member 41. The sensor members 31 and 41 are arranged in the circumferential direction γ, and an accommodation space 30a is formed between the sensor members 31 and 41. The first sensor member 31 has a sensor recess 32 recessed toward the side opposite to the second sensor member 41. The second sensor member 41 has a sensor recess 42 recessed toward the side opposite to the first sensor member 31. By assembling the first sensor member 31 and the second sensor member 41 in a state where the sensor recesses 32 and 42 face each other, the accommodation space 30a is formed by the sensor recesses 32 and 42. The first sensor member 31 and the second sensor member 41 are electrically connected by being in contact with each other.

As shown in FIGS. 2 and 3, the sensor members 31 and 41 have sensor bottoms 33 and 43, sensor wall portions 34 and 44, and sensor connection portions 35 and 45. The sensor bottoms 33 and 43 form the bottom surfaces of the sensor recesses 32 and 42, and the sensor wall portions 34 and 44 form the inner wall surfaces of the sensor recesses 32 and 42. The sensor wall portions 34 and 44 extend along the peripheral edges of the sensor bottom portions 33 and 43 and form an annular shape. The sensor wall portions 34 and 44 extend from the sensor bottom portions 33 and 43 in the axial direction α in a direction approaching each other. The sensor wall portions 34 and 44 are provided on the peripheral portions of the sensor bottom portions 33 and 43.

The sensor connecting portions 35 and 45 extend outward from the sensor wall portions 34 and 44 in the directions α and β orthogonal to the circumferential direction γ. The sensor connection portions 35, 45 extend along the tip portion, which is the open end portion of the sensor wall portions 34, 44, and form an annular shape. The sensor connecting portions 35 and 45 are provided at the tip portions of the sensor wall portions 34 and 44. The sensor bottoms 33 and 43 are formed in a rectangular shape, and the sensor wall portions 34 and 44 and the sensor connection portions 35 and 45 are formed in a rectangular frame shape.

In a state where the sensor members 31 and 41 are assembled to each other, the sensor connecting portion 35 of the first sensor member 31 and the sensor connecting portion 45 of the second sensor member 41 are connected to each other. In this case, these sensor connection portions 35 and 45 are overlapped with each other and are fixed to each other in a state of being sandwiched by the fixture.

In the sensor members 31 and 41, the sensor bottom portions 33 and 43 and the sensor wall portions 34 and 44 form an accommodation space 30a. In this case, the sensor bottom portions 33, 43 and the sensor wall portions 34, 44 correspond to the sensor base portion. Further, the sensor connecting portions 35 and 45 correspond to the sensor extending portions extending outward from the sensor base portion in the directions α and β orthogonal to the circumferential direction γ. The circumferential direction γ corresponds to the direction in which the sensor members 31 and 41 are lined up. In addition, in FIGS. 1 and 2, the cross-sectional view of the measured body M and the heat flow sensor 30 of the measuring unit 11 is shown. Further, in FIG. 2, the illustration of the magnetic flux detection coil 27 is omitted.

Returning to the description of FIG. 1, the power supply unit 13 is connected to the exciting coil 26 via electrical wiring. The power supply unit 13 is a voltage application unit that applies an AC voltage to the excitation coil 26. The magnetic flux generated by applying the AC voltage to the exciting coil 26 is an AC magnetic flux. The AC magnetic flux is a magnetic flux whose direction changes in a predetermined cycle, and the AC magnetic flux can also be referred to as a fluctuating magnetic flux. The magnetic flux density of the AC magnetic flux changes between a positive value and a negative value in a predetermined cycle. In the power supply unit 13, the voltage value, the current value, and the frequency of the AC power supplied to the exciting coil 26 can be individually adjusted.

The heat flow meter 14 is connected to the heat flow sensor 30 via electrical wiring. The heat flow meter 14 is a voltmeter that measures a voltage using a detection signal of the heat flow sensor 30. The heat flow meter 14 has a pair of terminals, one terminal is connected to the output terminal of the heat flow meter 14, and the other terminal is grounded to ground GND. The voltage value measured by the heat flow meter 14 is a value corresponding to the heat flow generated in the object M to be measured. The heat flow meter 14 can also be referred to as a heat flux meter.

The magnetic flux meter 15 is connected to the magnetic flux detection coil 27 via electrical wiring. The magnetic flux meter 15 is a voltmeter that measures the voltage generated in the magnetic flux detection coil 27 by electromagnetic induction using the detection signal of the magnetic flux detection coil 27. The voltage measured by the magnetometer 15 and the change mode of the voltage are values according to the magnetic flux density and frequency of the magnetic flux passing through the magnetic flux detection coil 27 and the joint iron portion 21.

The controller 16 controls the operation of the iron loss measuring device 10 and corresponds to the measuring control device. The controller 16 is electrically connected to the power supply unit 13, the heat flow meter 14, and the magnetic flux meter 15. The controller 16 controls the operation of the power supply unit 13 by outputting a command signal. Each measurement signal of the heat flow meter 14 and the magnetic flux meter 15 is input to the controller 16. The controller 16 performs an iron loss measurement process for measuring the iron loss of the object M to be measured.

The controller 16 is an electronic control device such as an ECU (Engine Control Unit), and provides a part of the control system. The controller 16 has at least one processor. The processor is provided by software stored in a physical memory device and a computer running the software. The processor may be provided only by software, may be provided only by hardware, or may be provided by combining a computer, software, and hardware. For example, the processor can be provided by a logic called if-then-else format, or a trained model such as a neural network tuned by machine learning. The processor may have an arithmetic processing unit such as a CPU and at least one memory device as a storage medium for storing programs and data. The processor may be provided by a computer with a storage medium readable by the computer.

The storage medium is a non-transitional substantive storage medium that stores a computer-readable program non-temporarily. The storage medium may be provided by a semiconductor memory, a magnetic disk, or the like. By being executed by the control system, the program causes the control system to function as a device described herein and to perform the methods described herein.

The processor may be provided by electronic circuits that are hardware. In this case, the processor can be provided by a digital circuit including a large number of logic circuits, or an analog circuit.

The control system may be provided by one processor, or a set of processors linked by a data communication device. Some of the means and functions provided by the control system are provided by processors configured to achieve those functions. A "processor configured to achieve a function" includes a case where the above function is achieved by software, a case where the above function is achieved by hardware, and a case where the above function is achieved by both software and hardware. And include.

The control device, signal source, and controlled object included in the control system provide various elements. At least some of those elements can be called blocks for performing functions. From another point of view, at least some of those elements can be referred to as modules or sections that are interpreted as a configuration. Further, the elements included in the control system can also be called means for realizing the function only when it is intentional.

Next, an iron loss measuring method for measuring the iron loss of the object M to be measured will be described. First, a mounting method for mounting the measurement unit 11 on the body to be measured M will be described. Here, the joint iron portion 21 in which the excitation coil 26 and the magnetic flux detection coil 27 are wound is set on a workbench or the like. The magnetic material is processed into a predetermined shape and size to form the object to be measured M, and the heat flow sensor 30 is attached to the object M to be measured. Specifically, the object to be measured M is accommodated between the first sensor member 31 and the second sensor member 41, and these sensor members 31 and 41 are fixed. Then, the heat flow sensor 30 is attached to the joint iron portion 21 so that the object M to be measured is installed in the gap 23. The power supply unit 13 is connected to the exciting coil 26, the magnetic flux meter 15 is connected to the magnetic flux detection coil 27, and the heat flow meter 14 is connected to the heat flow sensor 30. Further, the power supply unit 13, the heat flow meter 14, and the magnetic flux meter 15 are connected to the controller 16.

After that, the controller 16 is made to execute the iron loss measurement process. This iron loss measurement process will be described with reference to FIG.

In FIG. 4, in step S101, the feeding mode from the power supply unit 13 to the exciting coil 26 is set. Here, the voltage value, the current value, and the frequency are set for the electric power supplied from the power supply unit 13 to the exciting coil 26. In step S102, power is supplied from the power supply unit 13 to the exciting coil 26 by controlling the operation of the power supply unit 13. In step S103, the magnetic flux density [T] of the magnetic flux applied to the heat flow sensor 30 and the object M to be measured when the exciting coil 26 is energized is acquired. Here, the measurement signal of the magnetic flux meter 15 is acquired, and the voltage value and the frequency of the electric power generated in the magnetic flux detection coil 27 are calculated by using the measurement signal of the magnetic flux meter 15. Using these voltage values and frequencies, the magnetic flux density of the magnetic flux applied to the heat flow sensor 30 and the object to be measured M is calculated.

In step S104, it is determined whether or not the magnetic flux density acquired in step S103 is included in the allowable range. Here, a predetermined reference value for the magnetic flux density is read out from the storage medium of the controller 16, and it is determined whether or not the difference between the acquired value of the magnetic flux density and the reference value is included in the predetermined allowable range. For example, if the acquired value of the magnetic flux density is the same as the reference value, it is judged that this acquired value is included in the allowable range, and if the difference between the acquired value and the reference value is not included in the allowable range, it is determined. It is judged that this acquired value is not included in the allowable range.

If the acquired value of the magnetic flux density is not included in the allowable range, the process returns to step S101, and the feeding mode is set again. Here, the voltage value, the current value, and the frequency are set so that the difference between the magnetic flux density and the reference value becomes small based on the difference between the acquired value and the reference value. Specifically, at least the current value among the voltage value, the current value and the frequency is changed according to the magnetic flux density. For example, when the acquired value exceeds the allowable range on the larger side, the supply power is set so that the current value becomes smaller.

If the acquisition value of the magnetic flux density is included in the allowable range, the process proceeds to step S105 to acquire the sensor sensitivity A. The sensor sensitivity A is a coefficient indicating the relationship between the heat flow from the object M to be measured and the voltage at the heat flow sensor 30, and is an eigenvalue of the heat flow sensor 30. The sensor sensitivity A is acquired by a test or the like on the heat flow sensor 30, and is stored in advance in the storage medium. The unit of the sensor sensitivity A is [W / m ² V].

In step S106, the surface area S of the heat flow sensor 30 is acquired. The surface area S is the area of the entire inner surface of the heat flow sensor 30, and is stored in advance in the storage medium. The inner surface of the heat flow sensor 30 is a flat surface or a smooth curved surface. The heat flow sensor 30 is shaped so that the surface area S does not become excessively large with respect to the volume of the accommodation space 30a.

In step S107, the detection signal of the heat flow sensor 30 is acquired, and the voltage detected by the heat flow sensor 30 is calculated as the sensor voltage V by using this detection signal. Then, the acquired sensor voltage V is stored in the storage medium. The unit of the sensor voltage V is [V].

In step S108, the change mode of the sensor voltage V is acquired by using the past sensor voltage V stored in the storage medium, and it is determined whether or not the sensor voltage V has reached a steady state. The sensor voltage V begins to increase with the start of energization of the exciting coil 26, and eventually the heat flow per unit time generated in the object M to be measured is saturated. In this case, when the heat flow in the object M reaches the saturated state, the sensor voltage V in the heat flow sensor 30 reaches the saturated state.

Here, the difference between the sensor voltage V (t-1) acquired in the previous process in step S107 and the sensor voltage V (t) acquired in the process in this step S107 is calculated as the increased voltage ΔV. do. Then, it is determined whether or not the increased voltage ΔV is equal to or less than a predetermined determination value. When the increasing voltage ΔV is equal to or less than the determination value, it is determined that the sensor voltage V is in the steady state, and when the increasing voltage ΔV is not equal to or less than the determination value, it is determined that the sensor voltage V is not in the steady state. For example, the determination value is set to zero or a value close to zero.

When the sensor voltage V becomes a steady state, assuming that the heat flow in the measured body M has become a steady state, the process proceeds to step S109, and the heat flow Q from the measured body M is calculated using the sensor sensitivity A and the sensor voltage V. get. Here, the heat flow Q is calculated by multiplying the sensor sensitivity A and the sensor voltage V. The unit of heat flow Q is [W / m ² ]. For the heat flow Q, the relationship of Q [W / m ² ] = A [W / Vm ² ] × V [V] is established.

In step S110, the iron loss P in the object to be measured M is calculated using the heat flow Q and the surface area S. The unit of iron loss P is [W]. For the iron loss P, the relationship of P [W] = heat flow Q [W / m ² ] × surface area S [m ² ] is established.

The controller 16 has a function of executing each step of the iron loss measurement process. The function of executing the process of step S101 corresponds to the current setting unit. The function of executing the process of step S103 corresponds to the magnetic flux acquisition unit. The function of executing the process of step S107 corresponds to the voltage acquisition unit. The function of executing the process of step S108 corresponds to the steady-state determination unit. The function of executing the processing of steps S109 and S110 corresponds to the iron loss calculation unit.

When the iron loss P is measured by using the iron loss measuring device 10 with a plurality of measured objects M as measurement targets, the measurements of the measured objects M are performed one by one in order. The shape and size of each object M to be measured are uniformly uniform. As a result, when the iron loss P is measured for a plurality of objects to be measured M, the positional relationship between each object M to be measured and the heat flow sensor 30 becomes uniform in the accommodation space 30a. Therefore, it is less likely that the iron loss measurement conditions differ between the plurality of objects M to be measured.

According to the present embodiment described so far, when the magnetic flux is applied to the measured body M, the heat flow generated by the measured body M is detected by the heat flow sensor 30. In this configuration, the iron loss can be measured by using the detection signal of the heat flow sensor 30 by utilizing the correlation between the iron loss generated in the object M to be measured and the heat flow. Moreover, even if the period of the magnetic flux applied to the measured body M changes, the heat flow generated by the measured body M is unlikely to change. That is, the heat flow generated in the measured body M is not easily affected by the period of the magnetic flux applied to the measured body M. Therefore, the accuracy of iron loss measurement can be improved by using a heat flow for iron loss measurement.

According to the present embodiment, an accommodation space 30a for accommodating the object to be measured M is provided inside the heat flow sensor 30. The object to be measured M is accommodated in the accommodation space 30a and is covered by the heat flow sensor 30. In this configuration, all the heat flows generated in the object M to be measured can be detected by the heat flow sensor 30, so that the heat flow detection accuracy can be improved.

According to the present embodiment, in the heat flow sensor 30, the second sensor member 41 is provided on the side opposite to the first sensor member 31 with the accommodation space 30a interposed therebetween. In this configuration, the measured body M can be accommodated in the accommodation space 30a by simply arranging the measured body M between the first sensor member 31 and the second sensor member 41. As a result, the work load when the heat flow sensor 30 is attached to the object to be measured M can be reduced.

According to the present embodiment, in the heat flow sensor 30, the sensor connecting portion 35 of the first sensor member 31 and the sensor connecting portion 45 of the second sensor member 41 are in a state of overlapping each other. In this configuration, the sensor connection portions 35, 45 can be fixed to each other by simply sandwiching the sensor connection portions 35, 45 with the fixing tool. Therefore, the work load when fixing the first sensor member 31 and the second sensor member 41 to each other can be reduced.

According to the present embodiment, the magnetic flux generated by energizing the exciting coil 26 is applied to the object M to be measured. In this configuration, a heat flow can be generated in the object M to be measured by simply energizing the excitation coil 26. Therefore, it is possible to reduce the work load for generating a heat flow in the object to be measured M.

According to the present embodiment, the heat flow sensor 30 is provided in the gap 23 of the joint iron portion 21, and the exciting coil 26 is wound around the joint iron portion 21. In this configuration, it is not necessary to wind the exciting coil 26 around the object M to be measured and the heat flow sensor 30, so that the heat flow sensor 30 mounted on the object M to be measured is simply installed in the gap 23 to cause magnetic flux to the object M to be measured. Can be granted. In this way, if the exciting coil 26 is made by winding the electric wiring around the joint iron portion 21, even when the iron loss is measured for a plurality of the objects to be measured M, the excitation is applied to each of the objects M to be measured. There is no need to create the coil 26. In this case, the work load for making the excitation coil 26 can be reduced. Unlike the present embodiment, for example, in a configuration in which the excitation coil 26 is wound around the object to be measured M or the heat flow sensor 30, when iron loss is measured for a plurality of objects M to be measured, each of the objects to be measured M is measured. It becomes necessary to wind the exciting coil 26 around the wheel. Therefore, the work load for making the excitation coil 26 increases.

According to this embodiment, the magnetic flux applied to the object to be measured M is detected by the magnetic flux detection coil 27. In this configuration, when iron loss is measured for a plurality of measured objects M, the magnetic flux density of the magnetic flux applied to each of the measured objects M can be obtained. In this case, the current value of the electric power supplied to the exciting coil 26 can be adjusted so that the magnetic flux densities of the magnetic fluxes applied to the plurality of objects M to be measured are the same. Here, it is considered that the heat flow generated in the object M to be measured is affected by the magnetic flux density. Therefore, by making the magnetic flux density of the magnetic flux applied to the object to be measured uniform, the accuracy of detecting the heat flow of the object to be measured M can be improved, and as a result, the accuracy of measuring iron loss can be improved. ..

According to this embodiment, the controller 16 measures the iron loss of the object M to be measured by using the detection signal of the heat flow sensor 30. Therefore, by simply generating the heat flow in the body M to be measured, it is possible to easily detect the heat flow and measure the iron loss in the body M to be measured. Therefore, the work load when measuring the iron loss of the object to be measured M can be reduced.

According to the present embodiment, when the detection signal of the heat flow sensor 30 becomes a steady state, the iron loss is calculated using this detection signal. For example, if the iron loss is calculated using the detection signal at the timing before the detection signal becomes a steady state, this calculated value is likely to be smaller than the true iron loss. On the other hand, when the iron loss is calculated using the detection signal in the steady state as in the present embodiment, the calculated value is the same as or an approximate value to the true iron loss. Conceivable. Therefore, by calculating the heat flow in the steady state using the detection signal in the steady state and calculating the iron loss in the steady state using this calculated value, the measurement accuracy of the iron loss can be improved.

According to this embodiment, the detection signal of the heat flow sensor 30 is acquired as a voltage, and the iron loss is calculated using this voltage. In this configuration, the heat flow and iron loss can be calculated from the voltage by using the sensor sensitivity A or the like set according to the characteristics such as the shape and size of the heat flow sensor 30. Therefore, it is possible to improve the calculation accuracy of heat flow and iron loss.

According to the present embodiment, the magnetic flux density applied to the object M to be measured is acquired, and the energization current value to the exciting coil 26 is set using this magnetic flux density. In this configuration, when iron loss is measured for a plurality of objects to be measured M, the magnetic flux density of the magnetic flux applied to each object M can be made uniform. In this case, even if the heat flow generated in the object M to be measured is likely to change according to the magnetic flux density, the measurement accuracy of the heat flow can be improved by making the magnetic flux density uniform.

(Second Embodiment)
In the first embodiment, the exciting coil 26 is wound around the joint iron portion 21, but in the second embodiment, the exciting coil 26 is wound around the heat flow sensor 30. In this embodiment, the differences from the first embodiment will be mainly described.

As shown in FIG. 5, the object to be measured M is an annular plate material. For example, an annular electromagnetic steel sheet that forms a stator core and a rotor core by being laminated in plurality is the object M to be measured. In this case, it is not necessary to process the object to be measured M into a shape dedicated to measurement. The heat flow sensor 30 has an annular shape extending in the circumferential direction γ according to the shape of the object to be measured M. In the heat flow sensor 30, the accommodation space 30a also has an annular shape. In the state where the object to be measured M is accommodated in the accommodation space 30a, the heat flow sensor 30, the accommodation space 30a and the object to be measured M are coaxial, and their center lines coincide with each other. In the present embodiment, the center line of the heat flow sensor 30 is referred to as a center line CL. The body M to be measured does not have to be annular as long as it is annular.

The exciting coil 26 is formed by winding an electric wiring around a heat flow sensor 30 as in the first embodiment. The exciting coil 26 is wound around a part of the heat flow sensor 30 in the circumferential direction γ. In the circumferential direction γ, the region of the heat flow sensor 30 in which the heat flow sensor 30 is not wound is longer than the region in which the heat flow sensor 30 is wound. For example, in the heat flow sensor 30, a portion extending in the circumferential direction γ and having a central angle with respect to the center line CL included in a predetermined value, for example, 120 degrees, is a portion around which the exciting coil 26 is wound.

The magnetic flux detection coil 27 is wound around the heat flow sensor 30 in the same manner as the excitation coil 26. In FIG. 5, the magnetic flux detection coil 27 and the magnetic flux meter 15 are not shown.

As shown in FIGS. 6 and 7, in the heat flow sensor 30, unlike the first embodiment, the first sensor member 31 and the second sensor member 41 are arranged in the axial direction α. The sensor recesses 32 and 42 of the sensor members 31 and 41 are recessed in the axial direction α toward opposite sides. In the sensor members 31 and 41, sensor wall portions 34 and 44 are provided on the inner peripheral side and the outer peripheral side of the sensor bottom portions 33 and 43 in the radial direction β, respectively. In the heat flow sensor 30, the sensor connection portions 35 and 45 on the inner peripheral side are fixed to each other by a fixing tool in a state of being overlapped with each other. Similarly, the sensor connection portions 35 and 45 on the outer peripheral side are fixed to each other by a fixing tool in a state of being overlapped with each other. In FIG. 7, the excitation coil 26 is not shown.

Next, a method of mounting the measurement unit 11 on the body to be measured M will be described. Here, the first sensor member 31 and the second sensor member 41 are assembled to each other so that the object to be measured M is inserted into the sensor recesses 32 and 42. Then, the sensor members 31 and 41 are fixed to each other in a state where the object to be measured M is accommodated in the accommodation space 30a, and the heat flow sensor 30 is assembled. After that, the exciting coil 26 is wound around the heat flow sensor 30, and the heat flow meter 14 is connected to the exciting coil 26.

In the first embodiment, since the exciting coil 26 is not wound around the heat flow sensor 30, the iron loss, which is the loss in the object M to be measured, is included in the detection signal of the heat flow sensor 30, while the exciting coil 26 includes the exciting coil 26. The copper loss, which is the loss of the heat flow sensor 30, is not included in the detection signal of the heat flow sensor 30. On the other hand, in the present embodiment, since the exciting coil 26 is wound around the heat flow sensor 30, the iron loss which is the loss in the object M to be measured and the copper loss which is the loss in the exciting coil 26 are different. Both are included in the detection signal of the heat flow sensor 30.

As shown in FIG. 8, the equivalent circuit EC regarding heat is established for the object to be measured M and the exciting coil 26. In this equivalent circuit EC, the object M to be measured has a heat flow source AS and a heat storage unit AC. In the body M to be measured, the function of generating heat by iron loss is the heat flow source AS, and the iron loss generated by the heat flow source AS is referred to as iron loss Pcore. Further, the function of storing the heat generated in the heat flow source AS is the heat storage unit AC, and the heat capacity of the heat storage unit AC is referred to as the heat capacity Ccore. Further, in the exciting coil 26, the function of generating heat by the copper loss is the heat flow source 26S, and the copper loss generated in the heat flow source 26S is referred to as a copper loss Pcoil. Further, the function of storing the heat generated in the heat flow source 26S is the heat storage unit 26C, and the heat capacity in the heat storage unit 26C is referred to as a heat capacity Ccoil.

The equivalent circuit EC includes the thermal resistance R1 between the object M and the air, the thermal resistance R2 between the object M and the exciting coil 26, and the thermal resistance R3 between the exciting coil 26 and the air. And are included. The heat flow flowing through the thermal resistance R1 is the heat flow Q1 that reaches the air from the object M to be measured via the heat flow sensor 30. The heat flow flowing through the thermal resistance R2 is the heat flow Q2 that reaches the exciting coil 26 from the object M to be measured via the heat flow sensor 30. As described above, in the equivalent circuit EC, heat flows Q1 and Q2 are generated by the iron loss Pcore. Then, when the heat flow generated in the object M to be measured reaches a steady state, the total of the heat flows Q1 and Q2 and the iron loss Pcore become the same value.

When magnetic flux is started to be applied to the object M to be measured by energizing the exciting coil 26, both the heat flow due to the iron loss Pcore in the object M and the heat flow due to the copper loss Pcoil in the exciting coil 26 occur. It is detected by the heat flow sensor 30. In the heat flow sensor 30, the heat flow from the inside, which is the heat flow from the object M, is output as a positive value, and the heat flow from the outside, which is the heat flow from the excitation coil 26, is output as a negative value. Further, when the energization of the exciting coil 26 is started, the heat flow due to the copper loss Pcoil increases in a shorter time than the heat flow due to the iron loss Pcore.

As shown in FIG. 9, when the energization of the exciting coil 26 is started at the timing t0, the heat flow due to the copper loss Pcoil in the exciting coil 26 increases sharply, so that the sensor voltage V by the heat flow sensor 30 starts from zero. It becomes a negative value when it starts to decrease. After that, the sensor voltage V begins to increase when the rate of increase in the heat flow due to the iron loss Pcore in the object M exceeds the rate of increase in the heat flow due to the copper loss Pcoil. Then, after exceeding zero and becoming a positive value, the sensor voltage V becomes a steady state at a predetermined value. The sensor voltage V in the steady state is referred to as a steady voltage Vs.

The controller 16 calculates the total value of the heat flows Q1 and Q2 using the steady voltage Vs in the process corresponding to step S109 of the first embodiment of the iron loss measurement process. Further, in the process corresponding to step S110 of the first embodiment, the iron loss Pcore is calculated using the total value of the heat flows Q1 and Q2. Here, as described above, the steady-state voltage Vs includes information on both the heat flow due to the iron loss Pcore and the heat flow due to the copper loss Pcoil. Therefore, the iron loss Pcore is calculated from the steady voltage Vs using the coefficient corresponding to the sensor sensitivity A so as to extract the heat flow information due to the iron loss Pcore from the steady voltage Vs.

According to this embodiment, the excitation coil 26 is wound around the heat flow sensor 30. In this configuration, all of the magnetic flux generated by the exciting coil 26 is easily applied to the object to be measured M, so that the object to be measured M can generate as large a heat flow as possible. In this case, even if an error occurs between the heat flow generated in the object M to be measured and the sensor voltage V, the sensor voltage V becomes as large as possible together with the heat flow, so that the sensor voltage V is relative to the sensor voltage V. The error rate becomes smaller. Therefore, it is possible to improve the calculation accuracy of the sensor voltage V, the heat flow, and the iron loss.

Further, since the exciting coil 26 is wound around the heat flow sensor 30, it is not necessary to wind the exciting coil 26 around the joint iron portion 21. That is, it is not necessary to use the iron joint portion 21 when measuring the iron loss of the object M to be measured. Therefore, the manufacturing cost of the iron loss measuring device 10 can be reduced by the amount of the iron joint portion 21.

(Third Embodiment)
In the second embodiment, the exciting coil 26 is formed by winding the electric wiring around the heat flow sensor 30, but in the third embodiment, the exciting coil 26 is attached to the heat flow sensor 30 by a plurality of members. 26 is formed. In this embodiment, the differences from the second embodiment will be mainly described.

As shown in FIGS. 10 and 11, the exciting coil 26 is wound around the entire heat flow sensor 30 in the circumferential direction γ. Therefore, unlike the second embodiment, the heat flow sensor 30 has almost no region around which the excitation coil 26 is not wound.

The exciting coil 26 has a first coil member 51 and a second coil member 61. The coil members 51 and 61 are arranged in the circumferential direction γ, and a heat flow sensor 30 is provided between the coil members 51 and 61. The first coil member 51 has a coil recess 52 recessed toward the side opposite to the second coil member 61. The second coil member 61 has a coil recess 62 recessed toward the side opposite to the first coil member 51. The coil members 51 and 61 are mounted on the heat flow sensor 30 in a state where the heat flow sensor 30 is inserted into the coil recesses 52 and 62, respectively. In the axial direction α, the first coil member 51 is provided on the first sensor member 31 side, and the second coil member 61 is provided on the second sensor member 41 side.

A plurality of coil members 51 and 61 are arranged at predetermined intervals over the entire area of the heat flow sensor 30 in the circumferential direction γ. Each coil member 51, 61 forms an exciting coil 26 by assembling the heat flow sensor 30 in a direction straddling the radial direction β with the coil recesses 52, 62 facing each other. The plurality of first coil members 51 and the plurality of second coil members 61 are alternately and detachably connected in series in a path through which a current flows. In one first coil member 51, the inner peripheral end portion thereof is connected to the inner peripheral end portion of one of the second coil members 61 adjacent to each other in the circumferential direction γ, and the outer peripheral end portion thereof is formed. , Is connected to the outer peripheral end of the other second coil member 61. The plurality of first coil members 51 may be unitized by being connected to each other. Further, the plurality of second coil members 61 may be unitized by being connected to each other.

The coil members 51 and 61 have coil base portions 53 and 63, coil upright portions 54 and 64, and coil connection portions 55 and 65. The coil base portions 53 and 63 form the bottom surfaces of the coil recesses 52 and 62, and the coil upright portions 54 and 64 form the inner wall surfaces of the coil recesses 52 and 62. The coil upright portions 54 and 64 extend from the coil base portions 53 and 63 in the axial direction α in a direction approaching each other. The coil upright portions 54 and 64 are provided at both ends of the coil base portions 53 and 63, respectively.

The coil connecting portions 55 and 65 are provided at the tip portions of the coil standing portions 54 and 64. The coil connecting portions 55 and 65 have a shape and a size so as to be connected to each other. For example, the coil connection portion 55 of the first coil member 51 is a convex portion protruding from the tip surface of the coil upright portion 54, and the coil connection portion 65 of the second coil member 61 has a concave tip surface of the coil upright portion 54. It is a recess. Then, the convex portion of the coil connecting portion 55 is fitted into the concave portion of the coil connecting portion 65, so that the coil connecting portions 55 and 65 are detachably connected to each other.

Next, a mounting method for mounting the coil members 51 and 61 on the heat flow sensor 30 will be described. As shown in FIGS. 12 and 13, after the object to be measured M is accommodated in the accommodation space 30a of the heat flow sensor 30, the first coil member 51 and the second coil member 61 are placed on opposite sides of the heat flow sensor 30 with the heat flow sensor 30 interposed therebetween. Place in. Then, the first coil member 51 and the second coil member 61 are connected to form the excitation coil 26 so that the plurality of first coil members 51 and the plurality of second coil members 61 are alternately arranged in series. For example, the coil connecting portions 55 and 65 on the inner peripheral side are connected to each other so that the first coil members 51 adjacent to each other in the circumferential direction γ are connected by one second coil member 61, and the coil connecting portions 55 on the outer peripheral side are connected. 65 are connected to each other.

According to the present embodiment, the exciting coil 26 is formed by detachably connecting the first coil member 51 and the second coil member 61. In this configuration, the heat flow sensor 30 is arranged between the first coil member 51 and the second coil member 61, and the exciting coil is simply connected by connecting the first coil member 51 and the second coil member 61. 26 can be wound around the annular heat flow sensor 30. This makes it possible to reduce the work load when mounting the excitation coil 26 on the heat flow sensor 30. On the other hand, for example, in a configuration in which the excitation coil 26 is formed by winding the electric wiring around the annular heat flow sensor 30, it is necessary to repeatedly pass the electric wiring inside the heat flow sensor 30, which increases the work load. There is concern that it will become.

According to the present embodiment, a plurality of first coil members 51 and a plurality of second coil members 61 are mounted on the heat flow sensor 30. In this configuration, by making the number of coil members 51 and 61 used for forming the exciting coil 26 uniform, when iron loss is measured for a plurality of objects to be measured, the number of turns of the exciting coil 26 is the object to be measured. It is possible to avoid the variation for each M. On the other hand, for example, when the electric wiring is wound around the heat flow sensor 30, there is a concern that the number of turns of the excitation coil 26 will vary if the winding state of the electrical wiring varies.

(Other embodiments)
Although the plurality of embodiments according to the present disclosure have been described above, the present disclosure is not construed as being limited to the above embodiments, and is applied to various embodiments and combinations within the scope of the gist of the present disclosure. can do.

As a modification 1, the heat flow sensor 30 may be formed by assembling three or more members. For example, as shown in FIG. 14, in the first embodiment, the heat flow sensor 30 has at least four plate-shaped sensor members 71. In this configuration, at least two sets of a pair of sensor members 71 facing each other with the object to be measured M interposed therebetween are provided. One set of the sensor members 71 of the two sets is arranged in the circumferential direction γ, and the other set of the sensor members 71 are arranged in the radial direction β. These four sensor members 71 are in a state of surrounding the four sides of the object M to be measured.

As a modification 2, the inner surface of the heat flow sensor 30 and the outer surface of the object to be measured M do not have to extend in parallel. For example, as shown in FIG. 15, in the first embodiment, the accommodation space 30a has a substantially rectangular parallelepiped shape, while the measured body M has a spherical shape. In this configuration, the heat flow sensor 30 has four plate-shaped sensor members 71, as in the modification 1. The inner surface of the sensor member 71 extends in a direction orthogonal to the circumferential direction γ, while the outer surface of the object M to be measured is a spherical surface. Further, the outer surface of the object to be measured M is not parallel to the end faces 22a and 22b of the joint iron portion 21. In this case, the magnetic flux is likely to be distorted between the joint iron portion 21 and the object to be measured M, but the magnetic flux is still applied to the object M to be measured. Therefore, the heat flow generated in the object M to be measured can be detected by the heat flow sensor 30.

As a modification 3, the separation distance between the inner surface of the heat flow sensor 30 and the outer surface of the object to be measured M may be larger than the thickness dimension of the heat flow sensor 30. For example, as shown in FIG. 16, in the first embodiment, the object to be measured M is formed in a rectangular parallelepiped shape. In this configuration, the heat flow sensor 30 has four plate-shaped sensor members 71, and the distance between the sensor members 71 and the object M to be measured is the same, as in the modification 1. Further, when the iron loss is measured one by one for a plurality of objects to be measured M, the measurement conditions are made uniform by making the positional relationship between each object M to be measured and the heat flow sensor 30 uniform. Can be done.

As a modification 4, the heat flow sensor 30 does not have to cover the entire outer surface of the object M to be measured. For example, as shown in FIG. 17, in the first embodiment, the heat flow sensor 30 is provided at a position facing a part of the outer surface of the object M to be measured. In this configuration, the heat flow sensor 30 has a plurality of plate-shaped sensor members 71, as in the modification 1. One sensor member 71 faces a part of one surface of the object to be measured M. Even in this configuration, the heat flow from the portion of the outer surface of the object to be measured M facing the sensor member 71 is detected by the sensor member 71. Therefore, the iron loss in the measured body M can be measured by acquiring the ratio of the detected heat flow in the sensor member 71 to all the heat flows generated in the measured body M.

As a configuration in which the heat flow sensor 30 does not cover the entire outer surface of the object M to be measured, the heat flow sensor 30 has only one sensor member, or at least one of a plurality of surfaces of the outer surface of the heat flow sensor 30. A configuration in which no sensor member is provided for one surface can be mentioned.

As a modification 5, in a configuration in which the heat flow sensor 30 has a plurality of sensor members, these sensor members may be separated from each other. In this case, it is preferable that the heat flow meter 14 is individually connected to each sensor member. Further, if each sensor member is electrically connected via a conductor, the heat flow meter 14 may be connected to only one sensor member.

As a modification 6, the measured body M may be installed in the measuring unit 11 in a state of protruding from the region through which the magnetic flux passes. For example, in the first embodiment, the end portion of the object to be measured M may protrude outward from the peripheral edges of the end faces 22a and 22b of the joint iron portion 21 in the direction orthogonal to the circumferential direction γ (for example). See FIG. 14). Even in this case, since the heat flow is generated by applying the magnetic flux to at least a part of the object to be measured M, the iron loss in the object to be measured M can be measured.

As a modification 7, the fluctuating magnetic flux generated by the exciting coil 26 does not have to be an AC magnetic flux. Examples of the fluctuating magnetic flux include a magnetic flux that does not change between a positive value and a negative value in a predetermined cycle but fluctuates in a predetermined cycle with a positive value, and a magnetic flux that fluctuates in a predetermined cycle with a negative value. For example, the electric power supplied from the power supply unit 13 to the exciting coil 26 may be DC electric power instead of AC electric power. In this case, the voltage applied to the excitation coil 26 from the power supply unit 13 may be a voltage that increases or decreases in a predetermined cycle while maintaining a positive value, or a voltage that increases or decreases in a predetermined cycle while maintaining a negative value.

As a modification 8, the iron loss measuring device 10 does not have to have the magnetic flux detection coil 27. For example, the magnetic flux detection coil 27 is not wound around the joint iron portion 21 or the heat flow sensor 30. In this configuration, in the iron loss measurement process executed by the controller 16, the process of setting the feeding mode such as the energization current value to the exciting coil 26 according to the magnetic flux density of the magnetic flux applied to the object M is not performed. It will be.

As a modification 9, the excitation coil 26 may be wound around at least one of the joint iron portion 21, the heat flow sensor 30, and the object M to be measured. Similarly, the magnetic flux detection coil 27 may be wound around at least one of the joint iron portion 21, the heat flow sensor 30, and the object M to be measured.

As a modification 10, the iron loss measuring device 10 may have a permanent magnet as an exciting part. For example, by rotating a permanent magnet with respect to the joint iron portion 21, a fluctuating magnetic flux such as an AC magnetic flux is applied to the object M to be measured.

As a modification 11, in the iron loss measurement process, the iron loss may be calculated using the heat flow in a state where the heat flow detected by the heat flow sensor 30 is not in a steady state. Even in this case, the measurement accuracy of the iron loss can be improved by estimating the value of the heat flow in the steady state and calculating the iron loss using this estimated value.

As a modification 12, the iron loss may be calculated directly by using the detection signal of the heat flow sensor 30 in the iron loss measurement process. That is, the iron loss may be calculated without calculating the heat flow from the detection signal of the heat flow sensor 30. For example, in the iron loss measurement process of the first embodiment, instead of the processes of steps S109 and S110, the process of calculating the iron loss P using the sensor voltage V is executed as one step.

As a modification 13, the detection signal of the heat flow sensor 30 may be directly input to the controller 16 without going through the heat flow meter 14. This configuration can be realized by imparting the function of the heat flow meter 14 to the controller 16. Further, the detection signal of the magnetic flux detection coil 27 may be directly input to the controller 16 without going through the magnetic flux meter 15. This configuration can be realized by imparting the function of the magnetic flux meter 15 to the controller 16.

10 ... Iron loss measuring device, 16 ... Controller as measurement control device, 21 ... Joint iron part, 22a ... End face, 22b ... End face, 23 ... Gap, 26 ... Exciting coil as exciting part, 27 ... Magnetic current as magnetic flux sensor Detection coil, 30 ... heat flow sensor, 30a ... accommodation space, 31 ... first sensor member, 33 ... sensor bottom as sensor base, 34 ... sensor wall as sensor base, 35 ... sensor as sensor extension Connection part, 41 ... Second sensor member, 43 ... Sensor bottom part as sensor base part, 44 ... Sensor wall part as sensor base part, 45 ... Sensor connection part as sensor extension part, 51 ... First coil member, 61 ... 2nd coil member, M ... object to be measured, P ... iron loss, V ... voltage, α ... axial direction as orthogonal direction, β ... radial direction as orthogonal direction, γ ... lined up Circumferential direction as a direction, S101 ... current setting unit, S103 ... magnetic flux acquisition unit, S107 ... voltage acquisition unit, S108 ... steady determination unit, S109 ... iron loss calculation unit, S110 ... iron loss calculation unit.

Claims (14)

An iron loss measuring device (10) for measuring the iron loss of the measurement target (M).
An exciting unit (26) that generates a magnetic flux whose direction changes in a predetermined cycle and applies the magnetic flux to the measurement target.
A heat flow sensor (30) that is attached to the measurement target and outputs a detection signal according to the heat flow generated in the measurement target when the magnetic flux is generated in the excitation unit.
The iron loss measuring device is equipped with. The iron loss measuring device according to claim 1, wherein a storage space (30a) for accommodating the measurement target is provided inside the heat flow sensor so that the heat flow sensor covers the measurement target. .. The heat flow sensor is
The first sensor member (31) and
A second sensor member (41) provided on the side opposite to the first sensor member across the accommodation space and detachably attached to the first sensor member.
2. The iron loss measuring device according to claim 2. The first sensor member and the second sensor member are
The sensor base portion (33, 34, 43, 44) forming the accommodation space and
A sensor extension portion (35, 45) extending outward from the sensor base portion in a direction (α, β) orthogonal to the direction (γ) in which the first sensor member and the second sensor member are arranged side by side. )When,
3. The iron loss measuring device according to claim 3, wherein the sensor extending portions are fixed to each other in a state of being overlapped with each other. The iron loss measuring device according to any one of claims 1 to 4, wherein the exciting portion has an exciting coil (26) that generates the magnetic flux when energized. It has a pair of end faces (22a, 22b) that are separated from each other in a state of facing each other, and includes a joint iron portion (21) through which the magnetic flux is passed.
The heat flow sensor is provided in a gap (23) which is a space between the pair of end faces in a state of being attached to the measurement target.
The iron loss measuring device according to claim 5, wherein the exciting coil is wound around the joint iron portion. The iron loss measuring device according to claim 5 or 6, wherein the exciting coil is wound around the heat flow sensor in a state of being mounted on the measurement target. The excitation coil is
The first coil member (51) and
A second coil member (61) provided on the side opposite to the first coil member with the heat flow sensor interposed therebetween.
The iron according to any one of claims 5 to 7, wherein the first coil member and the second coil member are detachably connected to each other and wound around the heat flow sensor. Loss measuring device. The iron loss measuring device according to any one of claims 1 to 8, further comprising a magnetic flux sensor (27) that outputs a detection signal corresponding to the magnetic flux applied to the measurement target. The iron loss measuring device according to any one of claims 1 to 9, further comprising a measurement control device (16) for measuring iron loss to be measured by using the detection signal of the heat flow sensor. An exciting portion (26) that generates a magnetic flux whose direction changes in a predetermined cycle and applies the magnetic flux to the measurement target (M).
A heat flow sensor (30) that outputs a detection signal according to the heat flow generated in the measurement target due to the generation of the magnetic flux in the excitation unit while being mounted on the measurement target.
It is a measurement control device (16) that controls the iron loss measurement device (10) provided with the above.
A measurement control device including an iron loss calculation unit (S109, S110) that calculates an iron loss (P) to be measured by using the detection signal of the heat flow sensor. A steady-state determination unit (S108) for determining whether or not the detection signal of the heat flow sensor has reached a steady state is provided.
The measurement control device according to claim 11, wherein the iron loss calculation unit calculates the iron loss using the detection signal determined by the steady state determination unit to be in the steady state. A voltage acquisition unit (S107) that acquires the detection signal of the heat flow sensor as a voltage (V) is provided.
The measurement control device according to claim 11, wherein the iron loss calculation unit calculates the iron loss using the voltage acquired by the voltage acquisition unit. A magnetic flux acquisition unit (S103) that acquires the magnetic flux density applied to the measurement target, and
Using the magnetic flux density acquired by the magnetic flux acquisition unit, a current setting unit (S101) for setting a current value to be passed through the excitation unit, and a current setting unit (S101).
The measurement control device according to any one of claims 11 to 13.

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