JP2006258480A - System and method for analyzing magnetic property - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To analyze higher harmonic components of flux density as accurately as possible. <P>SOLUTION: An electromagnetic field analysis device 100 analyzes electromagnetic fields of a device to be analyzed and determines time-serial data of flux density. A two-dimensional magnetic measuring device 200 applies a voltage indication value computed in accordance with the time-serial data of flux density to exciting coils 207a-207d and measures flux densities Bx and By and magnetic files Hx and Hy in a sample 400. Since the time-serial data of flux density acquired by analyzing electromagnetic fields at the electromagnetic field analysis device 100 contains higher-harmonic components, it is possible to set the voltage indication value also in consideration of the higher-harmonic components. It is thereby possible to analyze electromagnetic fields as accurately as possible even in the case that rotating magnetic fields and alternating magnetic fields containing higher-harmonic components occur. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a magnetic property analysis system and a magnetic property analysis method, and is particularly suitable for use in analyzing the magnetic properties of an apparatus or facility including a magnetic material.

  Conventionally, techniques for analyzing an electromagnetic field using two-dimensional data measured by a two-dimensional magnetometer have been proposed (see Non-Patent Documents 1 to 3). In such a technique, a finite element method (FEM) is applied to two-dimensional data measured by a two-dimensional magnetometer, and the magnetic flux density of the fundamental wave component is analyzed.

  By the way, in many cases, harmonic components exist in the magnetic flux density of an electrical device or the like configured using a magnetic material. As shown in FIG. 9A, a motor having a rotor 901 and a stator 902 will be described as an example. A magnetic flux generated from a permanent magnet constituting the rotor 901 is a spatially rectangular wave. Since the harmonic component is included, the magnetic flux of the stator 902 excited by the rotor 901 is also given the harmonic component. More specifically, for example, as shown in FIG. 9B, the magnetic flux density is not uniform at the tooth tip 902a of the stator 902. Therefore, as shown in FIG. 10, harmonic components are included in the rotating magnetic field generated at the tooth tip 902a.

  Thus, the harmonic component exists in the magnetic flux density in the motor. Similarly, harmonic components often exist in the magnetic flux density in a generator, a transformer, or the like. However, in the techniques described in Non-Patent Documents 1 and 2 described above, only the fundamental wave component of the magnetic flux density is analyzed. For this reason, the harmonic component of magnetic flux density cannot be analyzed. In the technique described in Non-Patent Document 3, the harmonic component is analyzed for the magnetic field, but only the fundamental wave component is analyzed for the magnetic flux density.

  Therefore, a technique for analyzing components other than the fundamental wave component of the magnetic flux density has been proposed (see Patent Document 1). Specifically, in the technique described in Patent Document 1, high-frequency characteristics of magnetic flux density are inferred from the fundamental wave component of magnetic flux density obtained using two-dimensional data measured by a two-dimensional magnetometer. Yes.

JP 2004-184233 A M. Enokizono, "Two-dimensional Magnetic Property", JIEE-A, Vol.115, No1, pp.1-8, 1998. K. Fujisaki, Y. Nemoto, S. Sato, M. Enokizono and H. Shimoji, "2-D vector Magnetic method in comparison with conventional method", 7th International WorkShop on 1 & 2-Dimensional Magnetic Measurement and Testing Proceeding, edited by J .Sievert (PTB-E-81) .pp.159-166., 2002 H. Shimoji, M. Enokizono, T. Togata, T. Honda, "A new modeling of the vector magnetic property", IEEE Trans.Magn, Vol. 38, No. 2, pp. 861-864, March 2002

However, the technique described in Patent Document 1 merely estimates high-frequency characteristics of magnetic flux density, and does not analyze harmonic components of magnetic flux density. Therefore, such a technique cannot accurately analyze the harmonic component of the magnetic flux density.
As described above, the conventional technique has a problem that it is difficult to analyze the electromagnetic field in consideration of the harmonic component of the magnetic flux density.
The present invention has been made in view of such problems, and an object of the present invention is to make it possible to analyze the harmonic component of the magnetic flux density as accurately as possible.

  The magnetic characteristic analysis system according to the present invention is obtained by an electromagnetic field analysis unit that analyzes an electromagnetic field in a region to be analyzed and obtains time series data of a magnetic flux density and a magnetic field in the region to be analyzed, and the electromagnetic field analysis unit. Magnetic characteristic measuring means for measuring the magnetic flux density and magnetic field of the magnetic material by applying magnetic flux density based on the magnetic flux density time-series data or magnetic field based on the magnetic field time-series data to the magnetic material, and measuring the magnetic characteristics And a magnetic characteristic analyzing means for obtaining a magnetic characteristic of the magnetic body using a magnetic flux density and a magnetic field measured by the means.

  The magnetic property analysis method of the present invention is obtained by an electromagnetic field analysis step of analyzing an electromagnetic field of a region to be analyzed and obtaining time series data of magnetic flux density and magnetic field of the region to be analyzed, and the electromagnetic field analysis step. A magnetic characteristic measuring step for measuring the magnetic flux density and magnetic field of the magnetic material by applying a magnetic flux density based on the magnetic flux density time-series data or a magnetic field based on the magnetic field time-series data to the magnetic material, and measuring the magnetic characteristics And a magnetic characteristic analyzing step for obtaining the magnetic characteristic of the magnetic body using the magnetic flux density and the magnetic field measured in the step.

  According to the present invention, the electromagnetic field of the region to be analyzed is analyzed, the magnetic flux density and magnetic field time series data of the region to be analyzed is obtained, the obtained magnetic flux density or magnetic field is given to the magnetic material, Since the magnetic flux density and magnetic field of the magnetic material are measured, and the magnetic properties of the magnetic material are obtained using the measured magnetic flux density and magnetic field, the magnetic flux density containing the harmonic component is given to the magnetic material. Magnetic properties can be measured. Thereby, the electromagnetic field containing the harmonic component can be analyzed with as high accuracy as possible.

Next, a first embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram showing an example of the configuration of the magnetic characteristic analysis system of the present embodiment.
In FIG. 1, the magnetic characteristic analysis system includes an electromagnetic field analysis device 100, a two-dimensional magnetic measurement device 200, and a network 300 that connects the electromagnetic field analysis device 100 and the two-dimensional magnetic measurement device 200 so that they can communicate with each other. .

(Electromagnetic field analyzer)
The electromagnetic field analysis device 100 is for analyzing an electromagnetic field generated in a device or facility to be analyzed. The hardware configuration of the electromagnetic field analysis device 100 is, for example, as shown in FIG.

  In FIG. 2, an electromagnetic field analysis apparatus 100 includes a CPU 101, a ROM 102, a RAM 103, a keyboard controller (KBC) 105 of a keyboard (KB) 104, and a CRT controller (CRTC) 107 of a CRT display (CRT) 106 as a display unit. And a disk controller (DKC) 110 of the hard disk (HD) 108 and flexible disk (FD) 109 and a network interface controller (NIC) 112 for connection to the network 111 can communicate with each other via the system bus 113. It is set as the structure connected to.

The CPU 101 comprehensively controls each component connected to the system bus 103 by executing software stored in the ROM 102 or the HD 108 or software supplied from the FD 109.
That is, the CPU 101 performs a control for realizing an operation to be described later by reading a processing program according to a predetermined processing sequence from the ROM 102, the HD 108, or the FD 109 and executing it.

The RAM 103 functions as a main memory or work area for the CPU 101.
The KBC 105 controls an instruction input from the KB 104 or a pointing device (not shown).

The CRTC 107 controls display on the CRT 106.
The DKC 110 controls access to the HD 108 and the FD 109 that store a boot program, various applications, an editing file, a user file, a network management program, a predetermined processing program in the present embodiment, and the like.
The NIC 112 bidirectionally exchanges data with devices or systems on the network 111.

  The electromagnetic field analysis device 100 configured as described above divides a space occupied by an analysis target device or facility, and generates a magnetic flux density B (= {Bx, By} generated in each divided region (element). ) And the magnetic field H (= {Hx, Hy}) are calculated by electromagnetic field analysis by a finite element method based on Maxwell's electromagnetic equations. Here, a two-dimensional field is considered as an electromagnetic field analysis. The same applies to a three-dimensional field. More specifically, for example, the electromagnetic field analysis apparatus 100 performs an operation using an equation relating to a static magnetic field shown in the following (Equation 1).

Here, [μ] ⁻¹ c is the reciprocal of the magnetic permeability. A is a vector potential. This vector potential A is defined as the following (Formula 2). Bx and By are values of the magnetic flux density B generated in each divided region (element) in the x-axis direction and the y-axis direction, respectively. Hx and Hy are values of the magnetic field H generated in each divided region (element) in the x-axis direction and the y-axis direction, respectively.

Here, J ₀ is an applied current excited in the electric device. Based on this equation, a constitutive equation is obtained by a variational method or a Galerkin method using an interpolation function in a spatially discretized divided region (element). Then, using Gaussian elimination method or ICCG method, a vector potential A in the divided region (element) is obtained, and a magnetic flux density B and a magnetic field H there are obtained. Here, the obtained magnetic flux density B is obtained by changing a time-series change of applied current and a spatial time-series change of the rotor from time to time in accordance with an electromagnetic field generated in an apparatus or facility to be analyzed. The time-series data including the data is output to the two-dimensional magnetic measurement apparatus 200. As the electromagnetic field analysis, transient analysis including eddy current may be performed, or static magnetic field analysis may be performed if eddy current can be ignored. The details of the finite element method are described in, for example, “Nakada, Takahashi“ Electrical Engineering Finite Element Method 2nd Edition ”Morikita Publishing, 1982”, so only the outline is described here.

(Two-dimensional magnetometer)
Returning to FIG. 1, the two-dimensional magnetic measurement apparatus 200 uses the time-series data of the magnetic flux density B of each divided region (element) analyzed by the electromagnetic field analysis apparatus 100 to provide an apparatus or facility to be analyzed. It is for measuring the magnetic flux density B (= {Bx, By}) and magnetic field H (= {Hx, Hy}) of the same kind of magnetic material (hereinafter referred to as a sample) 400 used. .

  In FIG. 1, a two-dimensional magnetic measurement apparatus 200 includes a control unit 201, a data storage unit 202, an X-direction power source 203, a Y-direction power source 204, a first digital oscilloscope 205, and a second digital oscilloscope 206. And a sample placement unit 207.

The control unit 201 performs overall control of the two-dimensional magnetic measurement apparatus 200 and is configured using, for example, a microcomputer including a CPU, a ROM, and a RAM.
The data storage unit 202 stores magnetic flux density B (= {Bx, By}), magnetic field H (= {Hx, Hy}), etc., measured by the two-dimensional magnetometer 200. Constructed using.
The control unit 201 and the data storage unit 202 are disposed in a personal computer having a configuration as shown in FIG. 2, for example.

  The X-direction power source 203 supplies power to the excitation coils 207a and 207b wound around the excitation yokes 207i and 207j in order to excite the x-axis direction of the sample 400 according to control from the control unit 201. (See FIG. 3). The Y-direction power source 204 supplies power to the excitation coils 207c and 207d wound around the excitation yokes 207k and 207l in order to excite the y-axis direction of the sample 400 according to control from the control unit 201. (See FIG. 3).

  The first digital oscilloscope 205 includes a current waveform flowing through the Bx coil 207e for measuring the magnetic flux density Bx in the x-axis direction of the sample 400 and a By coil 207f for measuring the magnetic flux density By in the y-axis direction of the sample 400. The flowing current waveform, the voltage waveform output from the X-direction power source 203, and the voltage waveform output from the Y-direction power source 204 are monitored by 1ch to 4ch, respectively.

The second digital oscilloscope 206 has a current waveform flowing in the Hx coil 207g for measuring the magnetic field Hx in the x-axis direction of the sample 400, and a current flowing in the Hy coil 207h for measuring the magnetic field Hy in the y-axis direction of the sample 400. The waveform, the voltage waveform applied to the Bx coil 207e, and the voltage waveform applied to the By coil 207f are each monitored by 1ch to 4ch.
In the present embodiment, the value monitored as described above is converted into a digital signal obtained by sampling a waveform of one cycle by dividing it into N (N is a positive integer, for example, N = 512). (AD converted) and output to the control unit 201.

Here, an example of a detailed configuration of the sample setting unit 207 provided in the two-dimensional magnetic measurement apparatus 200 will be described with reference to FIG.
The sample setting unit 207 of this embodiment includes excitation coils 207a to 207d, a Bx coil 207e, a By coil 207f, an Hx coil 207g, a Hy coil 207h, and excitation yokes 207i to 207l. .

  The excitation yoke 207i and the excitation yoke 207j are arranged to face each other with the sample 400 in the x-axis direction. Further, the excitation yoke 207k and the excitation yoke 207l are arranged to face each other with the sample 400 in the y-axis direction. In addition, the sample 400 in this embodiment is, for example, a thin steel plate having a length and width of 80 mm and a thickness of 0.35 mm. Needless to say, the sample 400 may not be a thin steel plate as long as it is a magnetic material such as a ferromagnetic material, a ferrimagnetic material, a hard magnetic material, a soft magnetic material, and permalloy.

  Further, in order to concentrate the magnetic flux in the sample 400, the tips of the exciting yokes 207i to 207j have a tapered shape. Further, in order to make the magnetic flux in the sample 400 uniform, a gap of about 0.1 mm is provided between the sample 400 and the excitation yokes 207i to 207l.

The exciting coils 207a to 207d are wound around exciting yokes 207i to 207l, respectively.
The Bx coil 207e is wound through two holes provided to face each other in the x-axis direction via the center point of the sample 400. The By coil 207f is wound through two holes provided to face each other in the y-axis direction via the center point of the sample 400.
The Hy coil 207 h is wound in the y-axis direction above or below the sample 400. The Hx coil 207g is wound in the x-axis direction on the Hy coil 207h.

The magnetic flux density B and magnetic field H of the sample 400 are measured using the two-dimensional magnetometer 200 configured as described above.
Specifically, first, the control unit 201 inputs time-series data of the magnetic flux density B of each element analyzed by the electromagnetic field analysis device 100. Then, the control unit 201 converts the value of the voltage applied to the exciting coils 207a to 207d (hereinafter referred to as a voltage instruction value) so that the magnetic flux density B of the sample 400 becomes the input magnetic flux density B. 203 and the Y-direction power source 204.

  In FIG. 3, for the excitation coils 207 a and 207 b for exciting the sample 400 in the x-axis direction, for example, a voltage instruction value Vx (t) represented by the following (formula 3) is output to the X-direction power source 203. . For the excitation coils 207 c and 207 d for exciting the sample 400 in the y-axis direction, for example, a voltage instruction value Vy (t) represented by the following (Equation 4) is output to the Y-direction power source 204.

Here, ex (t) and ey (t) are expressed by the following (formula 5) and (formula 6).
ex (t) = Bx ′ (t) −Bx (t) (Formula 5)
ey (t) = By ′ (t) −By (t) (Expression 6)
Bx ′ (t) is data in the x-axis direction of the magnetic flux density B output from the electromagnetic field analysis device 100, and By ′ (t) is data in the y-axis direction of the magnetic flux density B output from the electromagnetic field analysis device 100. It is data.

Bx (t) is data in the x-axis direction of the magnetic flux density measured by the two-dimensional magnetic measurement apparatus 200, and By (t) is the y-axis of the magnetic flux density measured by the two-dimensional magnetic measurement apparatus 200. Direction data. Furthermore, k _1x , k _2x , k _3x , k _1y , k _2y , and k _3y are constant values that are appropriately determined by an operator or the like.

  The X-direction power source 203 and the Y-direction power source 204 to which the voltage instruction values Vx (t) and Vy (t) are input as described above are excited according to the voltage instruction values Vx (t) and Vy (t). A voltage is applied to 207d. The voltage applied to the excitation coils 207a to 207d and the current flowing through the excitation coils 207a to 207d are monitored by the first digital oscilloscope 205 and the second digital oscilloscope 206, respectively. The monitored voltage and current are AD converted and output to the control unit 201. Thereby, the control part 201 can know the voltage applied to the exciting coils 207a to 207d and the current flowing through the exciting coils 207a to 207d.

  As described above, when a voltage is applied to the excitation coils 207a to 207d and a current flows, the sample 400 is excited in the x-axis direction. Then, the voltage induced in the Bx coil 207e and the current flowing in the Bx coil 207e are monitored by the second digital oscilloscope 206 and the first digital oscilloscope 205, respectively. The monitored voltage and current are AD converted and output to the control unit 201. Thus, the control unit 201 can know the voltage induced in the Bx coil 207e and the current flowing in the Bx coil 207e, and the voltage induced in the Bx coil 207e and the current flowing in the Bx coil 207e. By using this, the magnetic flux density Bx in the x-axis direction of the sample 400 can be obtained.

  Further, when a voltage is applied to the excitation coils 207a to 207d and a current flows, a voltage is induced in the Hx coil 207g and a current flows. The current flowing through the Hx coil 207g in this way is monitored by the second digital oscilloscope 206. Accordingly, the control unit 201 can know the current flowing through the Hx coil 207g, and can determine the magnetic field Hx in the x-axis direction of the sample using the current flowing through the Hx coil 207g.

  Similarly, when a voltage is applied to the excitation coils 207a to 207d and a current flows, the sample 400 is excited in the y-axis direction. Then, the voltage induced in By coil 207f and the current flowing in By coil 207f are monitored by second digital oscilloscope 206 and first digital oscilloscope 205, respectively. The monitored voltage and current are AD converted and output to the control unit 201. Thereby, the control unit 201 can know the voltage induced in the By coil 207f and the current flowing in the By coil 207f, and can determine the magnetic flux density By in the y-axis direction of the sample 400.

Further, when a voltage is applied to the excitation coils 207a to 207d and a current flows, a voltage is induced in the Hy coil 207h and a current flows. In this way, the current flowing through the Hy coil 207 h is monitored by the second digital oscilloscope 206. Thereby, the control part 201 can know the electric current which flows into Hy coil 207h, and can obtain | require the magnetic field Hy in the y-axis direction of a sample.
The magnetic flux density Bx, magnetic flux density By, magnetic field Hx, and magnetic field Hy are respectively a voltage induced in the Bx coil 207e, a voltage induced in the By coil 207f, a voltage induced in the Hx coil 207g, and a voltage induced in the Hy coil 207h. The voltage at which the voltage is induced can also be obtained by time integration.

  When the data of the magnetic flux densities Bx and By obtained as described above are collected for one period, the control unit 201 uses the following (Equation 7) to determine whether the data of the magnetic flux densities Bx and By has converged. judge.

  Here, Bxo is the maximum value of the magnetic flux density Bx ′ (t) in the x-axis direction obtained by the electromagnetic field analyzer 100, and Byo is the magnetic flux density By ′ in the y-axis direction obtained by the electromagnetic field analyzer 100. This is the maximum value of (t).

  As a result of this determination, if the above (Equation 7) is satisfied, the control unit 201 sets the data for one period of the magnetic flux densities Bx and By and the magnetic fields Hx and Hy corresponding to the data of the magnetic flux densities Bx and By. Data for one cycle is stored in the data storage unit 202, and the magnetic permeability and iron loss in the sample 400 are obtained using the data of the magnetic flux densities Bx and By and the data of the magnetic fields Hx and Hy. The magnetic permeability can be obtained, for example, by calculating the ratio between the magnetic flux densities Bx and By and the magnetic fields Hx and Hy. Further, the iron loss can be obtained by, for example, calculating the area of the BH curve obtained from the magnetic flux density Bx and By data and the magnetic field Hx and Hy data.

  On the other hand, if the (Expression 7) is not satisfied, the data for one period of the magnetic flux densities Bx and By and the data for one period of the magnetic fields Hx and Hy are repeated until the (Expression 7) is satisfied. get.

  When the magnetic permeability and iron loss in the sample 400 are obtained as described above, the control unit 201 outputs the obtained magnetic permeability data and iron loss data to the electromagnetic field analysis apparatus 100. Here, the permeability data and the iron loss data are automatically output to the electromagnetic field analysis device 100. However, these data are output in response to a request from the electromagnetic field analysis device 100. May be.

  In this way, the electromagnetic field analysis apparatus 100 to which the magnetic permeability data and the iron loss data in the sample 400 are input is, for example, a portion of the input iron loss data that is made of the same material as the sample 400 in the apparatus to be analyzed. It is displayed as iron loss. In the form of displaying the iron loss, the value of the iron loss itself may be displayed, or the distribution of the iron loss of the device to be analyzed may be displayed.

  Here, the magnetic permeability and iron loss are obtained by the control unit 201 of the two-dimensional magnetic measurement apparatus 200, but data for one cycle of the magnetic flux densities Bx and By and one cycle of the magnetic fields Hx and Hy. May be output from the two-dimensional magnetic measurement apparatus 200 to the electromagnetic field analysis apparatus 100, and the magnetic field analysis apparatus 100 may determine the magnetic permeability and iron loss using these data.

Next, an example of a schematic operation of the electromagnetic field analysis apparatus 100 of the present embodiment will be described with reference to the flowchart of FIG.
First, in step S1, an electromagnetic field analysis of an apparatus or facility to be analyzed is performed using the above (1 formula) and (2 formula). At this time, the magnetic permeability μ of the device to be analyzed is input as an input parameter, the size and the number of divided regions (elements), and the applied current J ₀ are input, and the frequency and physical property values are further input as necessary. Input the information on the field, etc., and then analyze the electromagnetic field.

Next, in step S2, the time-series data of the magnetic flux density B obtained by the electromagnetic field analysis performed in step S1 is output to the two-dimensional magnetometer 200. Here, the time-series data of the magnetic flux density B is as shown in FIG.
Next, in step S3, the apparatus waits until the permeability data and the iron loss data of the sample 400 are input from the two-dimensional magnetometer 200. If these data are input, it will progress to step S4, will calculate the iron loss distribution in the apparatus used as an analysis object using the data of the iron loss, and will display the iron loss distribution.

Next, an example of a schematic operation in the control unit 201 of the two-dimensional magnetic measurement apparatus 200 of the present embodiment will be described with reference to the flowchart of FIG.
First, in step S11, the process waits until time-series data of the magnetic flux density B analyzed by the electromagnetic field analysis apparatus 100 is input. When the time series data of the magnetic flux density B is input, the process proceeds to step S12, where the time series data of the input magnetic flux density B is temporarily stored.

  Next, in step S13, the process waits until the measured value of the magnetic flux density B (= {Bx, By}) is input. When the measured value of the magnetic flux density B (= {Bx, By}) is input, the process proceeds to step S14, and the time series data of the magnetic flux density B input in step S11 using the above (formula 5) and (formula 6) Then, differences ex (t) and ey (t) from the measured value of the magnetic flux density B (= {Bx, By}) input in step S13 are obtained.

Next, in step S15, the voltage instruction values Vx (t) and Vy (t) are obtained using the above-mentioned (formula 3) and (formula 4).
Next, in step S16, the voltage instruction values Vx (t) and Vy (t) obtained in step S15 are output to the X-direction power source 203 and the Y-direction power source 204, respectively, and applied to the excitation coils 207a to 207d. Instruct.

  Next, in step S17, the process waits until the measurement value of the magnetic field H (= {Hx, Hy}) is input. When the measurement value of the magnetic field H (= {Hx, Hy}) is input, the process proceeds to step S18. The measured value of the magnetic flux density B (= {Bx, By}) determined to be input in S13 and the measured value of the magnetic field H (= {Hx, Hy}) determined to be input in Step S16 are each one cycle. It is determined whether or not they are ready. As a result of the determination, if the measurement values for one cycle are not complete, steps S13 to S18 are repeated until the measurement values for one cycle are complete.

  When the measurement values for one period are thus prepared, the process proceeds to step S19, and it is determined whether or not the convergence condition of (Expression 7) is satisfied. As a result of this determination, if the convergence condition of (Expression 7) is not satisfied, Steps S13 to S19 are repeated until the convergence condition of (Expression 7) is satisfied.

  Thus, when the convergence condition of (Expression 7) is satisfied, the process proceeds to step S20, and data for one cycle of the magnetic flux density B (= {Bx, By}) and the magnetic field H (= {Hx, Hy}) is stored as data. The magnetic flux density B (= {Bx, By}) data and the magnetic field H (= {Hx, Hy}) data and the magnetic permeability and iron loss in the sample 400 are stored in the storage unit 202. The obtained magnetic permeability data and iron loss data are output to the electromagnetic field analyzer 100.

  As described above, in the present embodiment, first, the electromagnetic field analysis apparatus 100 performs an electromagnetic field analysis in the analysis target apparatus and obtains time-series data of magnetic flux density. The two-dimensional magnetism measuring apparatus 200 applies voltage instruction values Vx (t) and Vy (t) calculated according to the time-series data of the magnetic flux density to the excitation coils 207a to 207d, and the magnetic flux density Bx in the sample 400, By and magnetic fields Hx and Hy are measured. Since the magnetic flux density time-series data obtained by the electromagnetic field analysis by the electromagnetic field analysis device 100 includes a harmonic component, the voltage instruction values Vx (t) and Vy (t) are also considered in consideration of the harmonic component. ) Can be set. This enables electromagnetic field analysis even when harmonic components are included in the rotating magnetic field or alternating magnetic field in which the magnetic flux density Bx in the x-axis direction and the magnetic flux density By in the y-axis direction mutually contribute. Therefore, it can be performed with high accuracy. Therefore, if a magnetic characteristic (iron loss) is analyzed using the magnetic characteristic analysis system of this embodiment, and a motor, a generator, and a transformer are designed based on the analysis result, a highly efficient motor, generator, and transformer Can be realized.

As in the present embodiment, it is preferable to perform convergence determination using the above-described (Equation 7) in step S19 in FIG. 5, so that more accurate measurement can be performed. However, it is not always necessary to perform this convergence determination. Absent.
In this embodiment, the magnetic permeability μ is used as an input parameter. However, the physical property value (that is, the φ difference) that depends on the angle φ formed between the easy axis of magnetization of the magnetic material included in the apparatus to be analyzed and the maximum magnetic flux density is used. As long as the physical property value has a directivity), the magnetic permeability μ is not necessarily required.

Further, as in the present embodiment, if the same kind of magnetic material as the analysis target device or equipment is used as the sample 400, the magnetic characteristics of the analysis target device or equipment can be analyzed with higher accuracy. Although it is preferable, it is not always necessary to use the same kind of magnetic material as that of the device or equipment to be analyzed as the sample 400.
In this embodiment, the voltage instruction values for the exciting coils 207a to 207d are determined so that the magnetic flux density B of the sample 400 becomes the magnetic flux density B of each element analyzed by the electromagnetic field analysis apparatus 100. However, the voltage instruction values for the excitation coils 207a to 207d may be determined so that the magnetic field H of the sample 400 becomes the magnetic field H of each element analyzed by the electromagnetic field analysis apparatus 100.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. In the first embodiment described above, the iron loss data obtained by the two-dimensional magnetic measurement device 200 is unconditionally adopted by the electromagnetic field analysis device 100 to obtain the iron loss of the device to be analyzed.

  On the other hand, in the present embodiment, the permeability data used as the input parameter when the electromagnetic field analysis apparatus 100 performs the electromagnetic field analysis is compared with the permeability data obtained by the two-dimensional magnetic measurement apparatus 200. Only when the above data is within a predetermined range, the iron loss data obtained by the two-dimensional magnetic measurement apparatus 200 is adopted as data for obtaining the iron loss of the analysis target apparatus.

  As described above, the present embodiment and the first embodiment described above are different in only part of the software processing of the magnetic characteristic analysis system. Detailed description will be omitted by attaching the same reference numerals as those shown in FIGS.

FIG. 6 is a flowchart for explaining an example of a schematic operation of the electromagnetic field analysis apparatus 100 of the present embodiment.
Steps S21 to S23 are the same as steps S1 to S3 in FIG. That is, in step S21, the electromagnetic field analysis of the device to be analyzed is performed using the above (1 formula) and (2 formula). Next, in step S22, the time-series data of the magnetic flux density B obtained by the electromagnetic field analysis performed in step S21 is output to the two-dimensional magnetic measurement apparatus 200. Here, the time-series data of the magnetic flux density B is as shown in FIG.

  Next, in step S23, the process waits until the permeability data and the iron loss data of the sample 400 are input from the two-dimensional magnetometer 200. When these data are input, the process proceeds to step S24, where the permeability data in the sample 400 input in step S23 and the permeability data used as input parameters for the electromagnetic field analysis in step S21 are within a predetermined range. It is determined whether or not it is inside.

  If the result of this determination is that the permeability data in the sample 400 input in step S23 and the permeability data used as input parameters in the electromagnetic field analysis in step S21 are not within the predetermined range, step S21 The electromagnetic field analysis is performed again using the permeability data input in step S23 as an input parameter. Then, steps S21 to S24 are repeated until the permeability data in the sample 400 input in step S23 and the permeability data used as input parameters in the electromagnetic field analysis in step S21 are within a predetermined range.

  As described above, when the permeability data in the sample 400 input in step S23 and the permeability data used as input parameters in the electromagnetic field analysis in step S21 are within a predetermined range, the process proceeds to step S25. Similarly to step S4, the iron loss distribution in the apparatus to be analyzed is obtained using the iron loss data in the sample 400 input in step S23, and the iron loss distribution is displayed.

  As described above, in the present embodiment, the magnetic permeability data in the sample 400 obtained based on the measurement in the two-dimensional magnetic measurement apparatus 200 and the magnetic permeability data used as input parameters when performing electromagnetic field analysis are predetermined. Only when it is within the range, the iron loss data based on the measurement by the two-dimensional magnetic measurement apparatus 200 is adopted as the data for obtaining the iron loss in the apparatus to be analyzed. The electromagnetic field analysis can be performed with higher accuracy when the included rotating magnetic field or alternating magnetic field is generated.

  In this embodiment, in step S24, the magnetic permeability data in the sample 400 input in step S23 and the magnetic permeability data used as input parameters in the electromagnetic field analysis in step S21 are within a predetermined range. It is not always necessary to do this. For example, it may be determined whether the permeability data of the sample 400 input in step S23 and the permeability data of the sample 400 input last time are within a predetermined range.

  In addition, it is determined whether or not the magnetic permeability data in the sample 400 and the magnetic permeability data used as input parameters for the electromagnetic field analysis are within a predetermined range. When the iron loss data is used as the input parameter, the iron loss data in the sample 400 and the iron loss data used as the input parameter for the electromagnetic field analysis are within a predetermined range. You may make it determine.

(Third embodiment)
Next, a third embodiment of the present invention will be described. In the first and second embodiments described above, a magnetic characteristic analysis system is configured by providing one each of the electromagnetic field analysis device 100 and the two-dimensional magnetic measurement device 200. In this case, when there are a plurality of types of magnetic bodies (steel materials) included in the apparatus to be analyzed, the two-dimensional magnetic measurement apparatus 200 must repeat measurement many times according to the types of magnetic bodies (steel materials). I must. Therefore, in this embodiment, the same number of two-dimensional magnetic measurement devices 200 as the types of magnetic bodies included in the device to be analyzed are provided.

  For example, when the magnetic bodies (steel materials) included in the apparatus to be analyzed are three types of steel materials A to C, as shown in FIG. The first two-dimensional magnetic measuring device 200a obtained based on the result, the second two-dimensional magnetic measuring device 200b obtained based on the result of the two-dimensional magnetic measurement, and the iron loss in the steel material C. And a third two-dimensional magnetic measurement apparatus 200c that obtains the above data based on the result of the two-dimensional magnetic measurement.

  The first to third two-dimensional magnetic measurement apparatuses 200a to 200c are the same as the two-dimensional magnetic measurement apparatus 200 of the first and second embodiments described above. And the electromagnetic field analysis apparatus 100 uses FIG.4 and FIG.6 using the data of the magnetic permeability in each steel materials AC input from the 1st-3rd two-dimensional magnetic measuring apparatus 200a-200c, and the data of an iron loss. The processing shown in the flowchart is performed on each of the steel materials A to C, and the distribution of iron loss in the apparatus to be analyzed is obtained.

In this way, electromagnetic field analysis can be performed at higher speed when a rotating magnetic field or alternating magnetic field containing harmonic components is generated.
In the present embodiment, the magnetic body (steel material) in the apparatus to be analyzed is subjected to two-dimensional magnetic measurement with one two-dimensional magnetic measurement apparatus 200. When the magnetic properties of the body (steel material) differ depending on the location, the two-dimensional magnetic measurement apparatus 200 may perform two-dimensional magnetic measurement for the same kind of magnetic body (steel material). In this way, the electromagnetic field analysis can be performed even faster.

  Further, as in the present embodiment, if the same number of two-dimensional magnetic measurement devices 200 as the types of magnetic materials included in the device to be analyzed are provided, the measurement of all the magnetic materials included in the device to be analyzed can be performed. Although it can be performed in parallel, it is preferable that a plurality of two-dimensional magnetic measurement devices 200 are provided, and it is not always necessary to provide the same number of two-dimensional magnetic measurement devices 200 as the types of magnetic bodies included in the device to be analyzed. Needless to say.

(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described. In the first to third embodiments described above, measurement and analysis are performed in two dimensions, but in this embodiment, measurement and analysis are performed in one dimension. Thus, since this embodiment and the first to third embodiments described above differ only in the dimensions to be measured and analyzed, the same parts as those of the first to third embodiments described above are as follows: Detailed description will be omitted by attaching the same reference numerals as those shown in FIGS.

FIG. 8 is a diagram illustrating an example of the configuration of the one-dimensional magnetic measurement apparatus according to the present embodiment.
In FIG. 8, a one-dimensional magnetic measurement apparatus 800 includes a control unit 801, a data storage unit 802, a power source 803, a digital oscilloscope 804, and a sample installation unit 805 that is a so-called Epstein device.

  The hardware configuration of the control unit 801 is the same as that of the control unit 201 in the first to third embodiments described above. The software configuration of the control unit 801 is the same as that of the control unit 201 in the first to third embodiments described above, except that one-dimensional data is processed instead of two-dimensional.

The hardware configuration of the data storage unit 802 is the same as that of the data storage unit 202 in the first to third embodiments described above, and the magnetic flux density B (= {Bx}) measured by the one-dimensional magnetic measurement apparatus 800. And a magnetic field H (= {Hx}) and the like are stored.
Note that the control unit 801 and the data storage unit 802 are disposed, for example, in a personal computer having a configuration as shown in FIG.

  The power source 803 is for supplying power to the primary winding 805b wound around the sample 805a in accordance with control from the control unit 801. The sample 805a is formed by combining a plurality of strip-shaped thin steel plates to form a hollow cubic shape so that a mouth-shaped magnetic path is formed.

The digital oscilloscope 804 monitors the current waveform flowing in the primary winding 805b and the voltage waveform and current waveform in the secondary winding 805c wound around the sample 805a.
In the present embodiment, the value monitored as described above is converted into a digital signal obtained by sampling a waveform of one cycle by dividing it into N (N is a positive integer, for example, N = 512). (AD converted) and output to the control unit 801.

Using the two-dimensional magnetometer 200 configured as described above, the magnetic flux density B of the sample 805a is measured.
Specifically, first, the control unit 800 inputs time-series data of the one-dimensional magnetic flux density B analyzed by the electromagnetic field analysis apparatus 100. Then, the control unit 800 outputs the voltage instruction value Vx (t) for the primary winding 805b to the power source 803 so that the magnetic flux density B of the sample 805a becomes the input magnetic flux density B. Here, the voltage instruction value Vx (t) is expressed by, for example, the above (Formula 3). Further, the electromagnetic field analysis apparatus 100 performs electromagnetic field analysis by replacing the two-dimensional expressions (Expression 1) and (Expression 2) with a one-dimensional expression.

  The power supply 803 that has received the voltage instruction value Vx (t) as described above applies a voltage to the primary winding 805b according to the voltage instruction value Vx (t). As a result, a voltage is generated in the secondary winding 805c. In this way, the voltage applied to the primary winding 805b, the current flowing through the primary winding 805b, and the voltage generated at the secondary winding 805c are monitored by the digital oscilloscope 804. The monitored voltage and current are AD converted and output to the control unit 801. Thus, the control unit 201 can know the primary-side power W, the current I flowing through the primary winding 805b, and the voltage V generated at the secondary winding 805c. And the magnetic flux density B and magnetic field H in the sample 805a are calculated | required using (Formula 8)-(Formula 10).

  When the data of the magnetic flux density B obtained as described above is collected for one period, the control unit 801 determines whether or not the data of the magnetic flux density B has converged. The data for the period and the data for one period of the magnetic field H corresponding to the data of the magnetic flux density B are stored in the data storage unit 802, and the data of the magnetic flux density B and the data of the magnetic field H are used. The magnetic permeability and iron loss in the sample 805a are obtained.

  On the other hand, when the data of the magnetic flux density B has not converged, data for one cycle of the magnetic flux density B and data for one cycle of the magnetic field H are repeatedly acquired until the data converges.

When the magnetic permeability and iron loss in the sample 805a are obtained as described above, the control unit 801 outputs the obtained magnetic permeability data and iron loss data to the electromagnetic field analyzer 100.
The electromagnetic field analysis apparatus 100 to which the permeability data and the iron loss data are input is, for example, the input iron loss data as the iron loss of the portion made of the same material as the sample 805a in the apparatus to be analyzed. indicate.

  As described above, in the present embodiment, the electromagnetic field analysis device 100 performs an electromagnetic field analysis in the analysis target device and obtains time-series data of one-dimensional magnetic flux density. The one-dimensional magnetometer 800 calculates a voltage instruction value Vx (t) according to the magnetic flux density obtained by the electromagnetic field analyzer 100, and uses the calculated voltage instruction value Vx (t) as the primary winding 805b of the Epstein device. To measure the magnetic flux density and magnetic field in the sample 805a. In this way, even when a one-dimensional analysis is performed, an electromagnetic field analysis including a harmonic component can be performed with as high accuracy as possible.

  In the present embodiment, the case where the measurement and analysis target in the magnetic property analysis system of the first embodiment is one-dimensional has been described. However, the measurement and analysis in the magnetic property analysis system of the second and third embodiments are described. Needless to say, it is possible to make the target one-dimensional in exactly the same manner as described in the present embodiment.

  In this embodiment, the case where the sample placement unit 805 is an Epstein device has been described, but the sample placement unit 805 is not limited to the Epstein device. For example, the one-dimensional magnetic flux density B and magnetic field H in the sample may be obtained using SST (Single Sheet Tester).

(Other embodiments of the present invention)
In order to operate various devices to realize the functions of the above-described embodiments, program codes of software for realizing the functions of the above-described embodiments are provided to an apparatus or a computer in the system connected to the various devices. What is implemented by operating the various devices according to a program supplied and stored in a computer (CPU or MPU) of the system or apparatus is also included in the scope of the present invention.

  In this case, the program code of the software itself realizes the functions of the above-described embodiments, and the program code itself and means for supplying the program code to the computer, for example, the program code are stored. The recorded medium constitutes the present invention. As a recording medium for storing the program code, for example, a flexible disk, a hard disk, an optical disk, a magneto-optical disk, a CD-ROM, a magnetic tape, a nonvolatile memory card, a ROM, or the like can be used.

  Further, by executing the program code supplied by the computer, not only the functions of the above-described embodiments are realized, but also the OS (operating system) or other application software in which the program code is running on the computer, etc. It goes without saying that the program code is also included in the embodiment of the present invention even when the functions of the above-described embodiment are realized in cooperation with the embodiment.

  Further, after the supplied program code is stored in the memory provided in the function expansion board of the computer or the function expansion unit connected to the computer, the CPU provided in the function expansion board or function expansion unit based on the instruction of the program code Needless to say, the present invention includes a case where the functions of the above-described embodiment are realized by performing part or all of the actual processing.

It is the figure which showed the 1st Embodiment of this invention and showed an example of the structure of the magnetic characteristic analysis system. It is the figure which showed the 1st Embodiment of this invention and showed an example of the hardware constitutions of an electromagnetic field analyzer. It is the figure which showed the 1st Embodiment of this invention and showed an example of the detailed structure of the sample installation part arrange | positioned at the two-dimensional magnetic measurement apparatus. It is a flowchart which shows the 1st Embodiment of this invention and demonstrates an example of schematic operation | movement of an electromagnetic field analyzer. It is a flowchart which shows the 1st Embodiment of this invention and demonstrates an example of schematic operation | movement in the control part of a two-dimensional magnetic measurement apparatus. It is a flowchart which shows the 2nd Embodiment of this invention and demonstrates an example of schematic operation | movement of an electromagnetic field analyzer. It is the figure which showed the 3rd Embodiment of this invention and showed an example of the structure of the magnetic characteristic analysis system. It is the figure which showed the 4th Embodiment of this invention and showed an example of the structure of the one-dimensional magnetic measurement apparatus. It is the figure which showed the prior art and showed notionally the structure of the motor which has a rotor and a stator, and distribution of the magnetic flux density in the teeth front-end | tip part of the motor. It is the figure which showed the prior art and showed the waveform of the magnetic flux density in the teeth front-end | tip part of a motor, and the waveform of a rotating magnetic field.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Electromagnetic field analyzer 200 Two-dimensional magnetic measuring apparatus 201 Control part 203 X direction power supply 204 Y direction power supply 207,805 Sample installation part 207a-207d Excitation coil 207e Bx coil 207f By coil 207g Hx coil 207h Hy coil 207i-207l Excitation connection Iron 400, 805a Sample 805b Primary winding 805c Secondary winding

Claims (11)

An electromagnetic field analysis means for analyzing an electromagnetic field of a region to be analyzed and obtaining time series data of a magnetic flux density and a magnetic field of the region to be analyzed;
Magnetic characteristic measurement for measuring the magnetic flux density and magnetic field of the magnetic material by applying to the magnetic material a magnetic flux density based on the magnetic flux density time-series data obtained by the electromagnetic field analysis means or the magnetic field time-series data. Means,
A magnetic characteristic analysis system comprising: magnetic characteristic analysis means for obtaining magnetic characteristics of the magnetic body using a magnetic flux density and a magnetic field measured by the magnetic characteristic measurement means.   The electromagnetic field analysis means divides a region to be analyzed into a plurality of elements, analyzes the electromagnetic field of each divided element using a finite element method, and magnetic flux density of each element in the region to be analyzed The magnetic characteristic analysis system according to claim 1, wherein time series data of the magnetic field is obtained.   The magnetic characteristic analysis system according to claim 1, wherein the magnetic characteristic includes iron loss.   The magnetic characteristic analysis system according to claim 1, wherein the time-series data of the magnetic flux density is time-series data represented by a two-dimensional vector. The region to be analyzed includes a magnetic material,
5. The magnetic characteristic analysis system according to claim 1, wherein the magnetic body is the same type of magnetic body as the magnetic body included in the region to be analyzed. 6.   One of the physical property data used in the electromagnetic field analysis performed by the electromagnetic field analysis means is a magnetic characteristic of the magnetic material obtained by the magnetic characteristic analysis means. The magnetic characteristic analysis system according to item 1.   The magnetic property analysis system according to claim 6, wherein at least one of the physical property data used in the electromagnetic field analysis performed by the electromagnetic field analysis means is physical property data having anisotropy. Whether or not the difference between the magnetic characteristic obtained by the magnetic characteristic analyzing means and the magnetic characteristic which is one of the physical property data used for the electromagnetic field analysis performed by the electromagnetic field analyzing means is within a predetermined range. A determination means for determining,
The electromagnetic field analysis means analyzes the electromagnetic field again using the magnetic characteristics obtained by the magnetic characteristic analysis means when the determination means determines that the difference in the magnetic characteristics is not within a predetermined range. The magnetic characteristic analysis system according to any one of claims 1 to 7, wherein   The magnetic characteristic analysis system according to claim 1, comprising a plurality of the magnetic characteristic measuring means.   10. The magnetic characteristic analysis system according to claim 1, wherein the magnetic characteristic measurement unit includes a number corresponding to a type of a magnetic material existing in the analysis target region. An electromagnetic field analysis step of analyzing the electromagnetic field of the region to be analyzed and obtaining time series data of magnetic flux density and magnetic field of the region to be analyzed;
Magnetic characteristic measurement for measuring the magnetic flux density and magnetic field of the magnetic material by giving the magnetic material a magnetic flux density based on the magnetic flux density time-series data obtained by the electromagnetic field analysis step or a magnetic field based on the magnetic field time-series data. Steps,
A magnetic property analysis method comprising: a magnetic property analysis step for obtaining a magnetic property of the magnetic body using a magnetic flux density and a magnetic field measured in the magnetic property measurement step.

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