JP2015099053A - Selection method of magnet material, magnetic measuring device used in the same, and permanent magnet motor configured by using the selection method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide means capable of selecting and ranking a magnetic material by inexpensively and simply evaluating the magnetization state of the magnetic material by a small scale facility, even a magnetic material, such as an Nd type having a large coercive force, and to provide a high-quality permanent magnet motor configured by a selected magnet.SOLUTION: The present invention includes a plurality of means for solving the problem, and one is a selection method of magnet material including the steps of: making a magnetization surface of an unmagnetized magnet material close to a magnetic field generation device, measuring the densities of magnetic fluxes having transmitted through the magnet material from the magnetic field generation device, and predicting and selecting magnetic characteristics of a magnetized magnet of the magnet material from a distribution of the densities of the magnetic fluxes. Thus, magnet quality can be predicted before mounting a magnet material on a permanent magnet motor so that a defective article can be excluded.

Description

  The present invention relates to a quality control method for a ferromagnetic material used in a permanent magnet motor.

  In high-power motors used in automobiles and the like, it has become common to increase the motor output using a ferromagnetic material (permanent magnet) having a large coercive force such as an Nd—Fe—B system. When using a ferromagnetic material for a motor, it is necessary to apply a large magnetic field of 15 k gauss or more to the ferromagnetic material and magnetize it. Magnetization may be performed before or after the ferromagnetic material is incorporated into the motor. However, as described above, a large applied magnetic field is used to magnetize the Nd—Fe—B based ferromagnetic material. Therefore, if the magnetic field necessary for magnetization cannot be secured, the phenomenon that the magnetization of the ferromagnetic material becomes incomplete and the output of the motor is reduced occurs. Further, the magnetizing characteristics of the magnet are easily affected by the magnet components and the manufacturing method.

  Traditionally, magnet materials made in Japan have been the mainstream, but in recent years, high-efficiency Nd-Fe-B magnet motors have been used for motors used in energy equipment such as hybrid vehicles, electric vehicles, and wind power generation. As a result, supply importance is increasing. Along with the increase in supply, overseas magnet materials are becoming mainstream. However, overseas magnet materials have a problem that the quality of magnets varies greatly. In addition, although development of magnets with reduced dysprosium is in progress due to insufficient supply of rare earth elements, the quality of such magnets tends to be unstable. For this reason, there is concern about variations in the characteristics of the magnet material, and it is extremely important to manage the magnetization state of the ferromagnetic material.

  JP-A-6-2891127 (Patent Document 1) is known as a background art in the technical field related to the evaluation of magnetic properties of ferromagnetic materials. As a premise, magnetic property measurement of an object to be measured of a ferromagnetic material such as a permanent magnet is performed. A magnetic flux generated by passing a current through a coil 803 is injected into the object to be measured, and the object to be measured is measured by a B coil and an H coil. It is common to measure the resulting BH characteristics. In this case, if there is a gap between the magnetic pole of the electromagnet and the object to be measured, an error occurs in the measurement due to the demagnetizing field of the magnetic pole generated at the interface of the object to be measured. In Patent Document 1, in order to make this gap as small as possible, a strain gauge of a thin pressure sensor is installed on the surface where the object to be measured and the magnetic pole are in contact, and the output of the strain gauge is connected to a strain gauge and a transducer. A magnetic characteristic measuring device is described in which a detection signal detected via a feedback is fed back to a driving motor to automatically control the pressure applied to the object to be measured.

  In order to quantify the magnetization state of the magnet before magnetizing, as a method for predicting the magnetic characteristics of the magnet material before magnetization by measuring the attractive force between the magnet material before magnetization and the magnetized magnet material, -119138 (patent document 2). In Patent Document 2, the magnitude of the attracting force of the magnet material is measured by measuring the magnitude of the attracting force of the magnet material when the magnet material before magnetizing and the attracting force generating magnet are close to each other. The magnetic characteristic of the magnet after magnetizing the magnet material is predicted at the stage of the magnet material by utilizing the fact that the magnetic properties of the magnet after magnetization are opposite to each other.

JP-A-6-289112 JP-A-5-119138

  In the method of measuring the magnetic properties of a magnet based on the BH characteristics of Patent Document 1, when measuring a magnetic material such as an Nd-based material having a large coercive force, an electromagnet that generates a large magnetic field is required. Is required. In addition, since adjustment before measurement takes time, it is not suitable for low-cost and simple measurement.

  In Patent Document 2, the attractive force generated on the opposing surfaces of the non-magnetized magnet and the attractive force generating magnet is a value proportional to the product of the magnetization of the attractive magnet and the area of the relative surface from the definition of the attractive force. Because there is only an average value, it is difficult to reflect the change in magnetic properties due to the part of the pre-magnetization material in the attractive force, the magnetic property distribution in the surface of the magnet material is unknown, and it is difficult to judge whether the magnetic properties are good or bad There were drawbacks. When there is a large variation in the distribution of magnetic characteristics in the plane of the magnet material, there is a problem that the pulsation of a motor using the magnetic material increases.

  Therefore, the problem to be solved by the present invention is that when predicting the magnetic properties before magnetizing the magnet material, it is possible to select and rank the magnet materials by predicting the magnetic property distribution in the plane of the magnet material. It is to provide a means to do. Another object of the present invention is to provide a high-quality permanent magnet motor composed of selected magnets.

  The present invention includes a plurality of means for solving the above problems. To give an example, the magnetized surface of the magnet material before magnetization is brought close to the magnetic field generator, and the magnet material is removed from the magnetic field generator. This is achieved by measuring the transmitted magnetic flux density and predicting and selecting the magnetic properties of the magnet after magnetizing the magnet material from the distribution of the magnetic flux density.

  The magnet quality can be predicted and defective products can be eliminated before the magnet material is mounted on the permanent magnet motor.

1 is a configuration diagram of a magnetic measurement apparatus of Example 1. FIG. It is the figure which showed the positional relationship of the Hall element array of Example 1, and an iron core. It is a figure which shows an example of the magnetic measurement result which concerns on Example 1. FIG. It is the figure which showed the process flow of the magnetic measurement apparatus of Example 1. FIG. 6 is a diagram illustrating an application example of Example 1. FIG. It is the figure which showed the cross-section of the permanent magnet motor which concerns on Example 2. FIG. It is a block diagram of the magnetic measurement apparatus of Example 2. It is a block diagram of the magnetic measuring apparatus of Example 3. It is the figure which showed the positional relationship of the Hall element array of Example 3, and an iron core. It is a block diagram of the magnetic measurement apparatus of Example 4. It is the figure which showed the process flow of the magnetic measurement apparatus of Example 4. FIG. It is a figure which shows magnetic flux density distribution of the magnet raw material which concerns on Example 5. FIG. It is a schematic diagram of a ferromagnetic material cross section.

  Hereinafter, examples will be described with reference to the drawings.

  First, the necessity for improving the quality of magnetic characteristics will be described. FIG. 13 shows an example of a cross-sectional structure after magnetization of an Nd—Fe—B based magnet material. It is difficult to completely magnetize the Nd-Fe-B ferromagnet, and if the material of the magnet material or the magnetized state is bad, there are non-magnetized parts (particles) in a multi-domain state as shown in FIG. To do. When the temperature of such a ferromagnetic material having a multi-domain region is increased by heating, the multi-domain region propagates from the multi-domain region and the magnetic flux density is reduced, so that the magnetization characteristics deteriorate. For this reason, it is an important factor for improving the quality of the magnetic characteristics of the product to remove from the product a magnet having many multi-domain regions after such magnetization.

  In this embodiment, an apparatus for measuring the magnetic flux density distribution of a pre-magnetization magnet material when predicting the magnetic characteristics of the pre-magnetization magnet using a hall element array in which a plurality of hall elements as magnetic sensors are arranged, and An example of a measurement method is shown.

  FIG. 1 shows a configuration diagram of a magnetic measurement apparatus that simply measures the magnetic flux density distribution of the pre-magnetization magnet of this embodiment. 101 is a Hall element array, 102 is a magnet material holder, 103 is an unmagnetized magnet material, 104 is a magnet material holder drive control mechanism, 105 is a coil, 106 is an iron core, and 107 is a housing. The data measured by the Hall element array 101 and the magnet material holder drive control signal may be either synchronized with each other or not.

  In the present embodiment, a magnet using an apparatus having a moving mechanism for moving the magnet material 103 to the space between the Hall element array 101 and the iron core 106 while maintaining the relative positional relationship between the Hall element array 101 and the iron core 106 is used. A method for measuring the magnetic flux density distribution in the material surface will be described. As a magnetic field generator, a magnetic field from the iron core 106 toward the magnet material 103 is generated by passing a current through the coil 105. The generated magnetic field passes through the magnet material 103 and is measured by the opposing Hall element array 101 which is a magnetization measuring unit.

  FIG. 2 is a diagram showing the positional relationship between the Hall element array 101 and the iron core 106. FIG. 2A is a configuration diagram of the Hall element array 101 and the iron core 106 viewed from a direction parallel to the paper surface of FIG. The upper part of FIG. 2A shows an example of the structure of the Hall element array 101. The Hall elements 201 are arranged in a line at the end of the substrate 203 and are connected via an amplifier 202 built in the substrate 203. A measurement signal can be acquired.

  The lower part of FIG. 2A shows an example of the shape of the iron core 106. The iron core 106 has substantially the same width as the hall element 201 and has almost the same length as the hall element array 101. It has a structure. FIG. 2B is a diagram showing the relationship between the Hall element array 101 and the iron core 106 as viewed from the direction perpendicular to the paper surface of FIG. As shown in FIG. 2B, a magnetic field 205 generated by passing a current through the coil 105 (see FIG. 1) is applied to the magnet material 103 (not shown) from the end face of the iron core 106, and the magnet material 103 is moved. It is measured by the Hall element array 101 that passes through and opposes. Therefore, the Hall element array 101 can measure the magnetization after the same magnetic field generated with the same current passes through the magnet material 103. Since the magnetization after passing through the magnet material 103 changes depending on the magnetization behavior of the magnet material such as domain wall motion and magnetization reversal inside the magnet material, the magnet before magnetization is measured by measuring the magnetic flux density distribution of the magnet material 103 by this measurement. Predict material properties.

  In the Hall element array 101, Hall elements are arranged in a direction perpendicular to the paper surface of FIG. 1, so that the magnet material 103 is linearly aligned in a direction perpendicular to that (the left-right direction on the paper surface of FIG. 1). By measuring the magnetization while moving, the magnetic flux density distribution in the plane of the magnet material can be measured. In this case, a highly accurate magnetic flux density distribution can be obtained by synchronizing the measurement timing of the Hall element and the movement amount of the magnet material. However, the magnetic flux density distribution of the magnet material can be relatively evaluated even when not synchronized.

  The sampling time in the Hall element array used in this device was 1 millisecond or less, and the moving speed of the magnet material was 1 millisecond / second. In this case, if the circular magnet has a diameter of 20 mm, data can be obtained in a short time of about 20 seconds.

  Here, as shown in FIG. 2, the Hall element array of the type in which the Hall elements are arranged in a line is shown. However, as a Hall element array as a single element, or as another Hall element array arranged in a matrix in a plurality of columns. Also good. In addition, when arranged in a plurality of rows, the moving amount of the magnet material by the drive mechanism can be reduced, which has the effect of shortening the measurement time.

  Furthermore, a magnetic sensor array may be used using another magnetic sensor, for example, an MR element (magnetoresistance element) instead of the Hall element. Further, the movement mechanism has been described as moving the magnet material. However, since the magnet material only needs to move relatively between the Hall element array and the iron core, for example, the magnet material is fixed and the Hall element array is fixed. The magnetic flux density distribution of the magnet material may be measured using other driving methods such as moving the iron core.

  FIG. 3 shows the relationship between the applied magnetic field measured by the Hall element array and the transmitted magnetic flux density after passing through the magnet material for the same type of magnet material of the same manufacturer. As the applied magnetic field increases in both the magnet material (a) and the magnet material (b), the transmitted magnetic flux density also increases. However, in the magnet material (b) having a low transmitted magnetic flux density, any applied magnetic field is lower than the transmitted magnetic flux density of the magnet material (a). For this reason, it is possible to predict the magnetic characteristics of the pre-magnetization magnet by measuring the transmission magnetic flux density with respect to an arbitrary applied magnetic field. As another prediction method, a plurality of types of magnetic fields may be applied to the magnet material, and the magnetic flux density distribution of the magnet material may be measured to predict the characteristics of the magnet material.

  FIG. 4 is a process flow for measuring the magnetic flux density distribution of the magnet material with the magnetometer shown in FIG. In FIG. 4, first, in step 01 (hereinafter step is abbreviated as S), a current is passed through the iron core to generate a magnetic field. In this state, the magnet material is moved (S02), and the magnetic flux density is measured by passing between the iron core and the Hall element array. The measurement of the magnetic flux density distribution can be realized by setting an applied magnetic field in advance and repeating the measurement up to a predetermined number of movements N (S03).

  FIG. 5 shows an outline of a drive device for a hybrid vehicle, which is an application example of a permanent magnet motor. By using an engine 501 driven by gasoline supplied from the tank 504 and a motor 502 driven by electricity of the battery 503 efficiently, low fuel consumption is realized. A permanent magnet motor is often used for such a highly efficient motor.

  As described above, in this embodiment, the magnetic field generator that applies a magnetic field to the magnetized surface of the magnet material before magnetization, the magnetization measuring unit that measures the magnetic flux density that has passed through the magnet material, and the magnetic field generator And the magnetization measurement unit fixed at a certain interval, and a magnetic mechanism comprising a moving mechanism for moving the magnet material relatively between the magnetic field generator and the magnetization measurement unit The apparatus can measure the magnetic flux density distribution of the magnet material before magnetization and predict and select the magnetic characteristics of the magnet after magnetization of the magnet material from the magnetic flux density distribution. In other words, the magnetized surface of the magnet material before magnetization is brought close to the magnetic field generator, the magnetic flux density transmitted through the magnet material from the magnetic field generator is measured, and the magnet material is magnetized from the distribution of the magnetic flux density. The magnetic properties of the later magnets can be predicted and selected.

  Therefore, the magnetization state of the magnetic material can be easily evaluated at low cost with a small-scale facility. Further, it is possible to provide a high-quality permanent magnet motor composed of selected magnets.

  Moreover, since the magnet quality can be predicted and defective products can be eliminated before the magnet material is mounted on the permanent magnet motor, the occurrence rate of defective products due to the magnet material can be greatly reduced. In addition, since it is possible to eliminate defective magnet materials or classify magnet materials, it is possible to contribute to effective utilization of resources according to the required specifications of permanent magnet motors.

  FIG. 6 shows a cross-sectional view of a typical permanent magnet motor. A magnet 601 is embedded in a rotor inside the motor, and is roughly divided into magnets (a) and (b) having a rectangular cross-sectional shape or magnets (c) and (d) having a curved cross-sectional shape as illustrated.

  Therefore, in this embodiment, a magnetic measuring device in the case where the magnet material has a curved cross-sectional shape will be described with reference to FIG.

  In FIG. 7A, the magnetic flux of the magnet material 701 is maintained by keeping the distance between the Hall element array 101 and the iron core 106 constant and moving the magnet material 701 between the Hall element array 101 and the iron core 103 relatively. Measure the density distribution. In this case, measurement can be performed by adding a driving device 702 as a moving mechanism capable of rotating the magnet material along the radius of curvature of the curved cross section of the magnet material 701. FIG. 7B shows a view of the magnet material 701 and the driving device 702 shown in FIG. As in the first embodiment, by measuring the magnetization while rotating the magnet material 701 by the drive motor 703 in the direction orthogonal to the Hall element array 101, the magnetic flux density distribution in the surface of the magnet material can be measured.

  By synchronizing the measurement timing of the Hall element and the amount of movement of the magnet material, a highly accurate magnetic flux density distribution can be obtained, but the magnetic permeability distribution of the magnet material can be relatively evaluated even when not synchronized. Further, here, as shown in FIG. 2, the Hall element array of the type in which the Hall elements are arranged in a line is shown. However, the Hall elements may be arranged as a single Hall element or arranged in a matrix in a plurality of columns. It may be an array. In addition, when arranged in a plurality of rows, the moving amount of the magnet material by the driving device can be reduced, which has the effect of shortening the measurement time.

  Furthermore, a magnetic sensor array may be used using another magnetic sensor, for example, an MR element (magnetoresistance element) instead of the Hall element. Further, the movement mechanism has been described as moving the magnet material. However, since the magnet material only needs to move relatively between the Hall element array and the iron core, for example, the magnet material is fixed and the Hall element array is fixed. The magnetic flux density distribution of the magnet material may be measured using other driving methods such as moving the iron core.

  FIG. 8 shows a magnetic measuring device having another configuration in the case where the magnet material has a curved cross-sectional shape. 8, the hall element array 801, the unmagnetized magnet material 701, and the iron core 206 are different from those in FIG. In the present embodiment, as in FIG. 1, a moving mechanism for moving the magnet material 701 to the space between the Hall element array 801 and the iron core 206 while maintaining the relative positional relationship between the Hall element array 801 and the iron core 206 is provided. The magnetic flux density distribution in the surface of the magnet material is measured using an apparatus having the same.

  9 is a diagram showing the positional relationship between the Hall element array 801 and the iron core 206. FIG. 9A shows the configuration of the Hall element array 801 and the iron core 206 as viewed from the direction parallel to the paper surface of FIG. FIG. The upper part of FIG. 9A shows an example of the structure of the Hall element array 801, and the Hall element array 801 has a structure bent according to the radius of curvature of the magnet material 701. That is, the substrate 204 is bent according to the curvature radius of the magnet material 701. The Hall elements 201 are arranged in a line along the edge of the substrate 204 and have a structure in which a measurement signal can be obtained via an amplifier (not shown) built in the substrate 204.

  9A shows an example of the shape of the iron core 206. The tip of the iron core 206 has substantially the same width as the Hall element 201, and like the Hall element array 801, The magnet material 701 is bent according to the curvature radius.

  FIG. 9B is a cross-sectional view showing the relationship between the Hall element array 801 and the iron core 206 as seen from the direction perpendicular to the paper surface of FIG. As shown in FIG. 9B, a magnetic field generated by passing a current through the coil 105 (see FIG. 8) is applied to the magnet material 701 from the end face of the iron core 206, passes through the magnet material 701, and is opposed to the hole. The structure is measured by the element array 801. Therefore, the Hall element array 801 can measure the magnetization after the same magnetic field generated with the same current passes through the magnet material 701. The magnetic material holder 102 is driven in a direction parallel to the paper surface by the driving device 104, and the magnet material 701 is linearly moved in the left-right direction with respect to the paper surface, whereby the magnetic flux density distribution of the magnet material 701 having a curved cross-sectional shape is obtained. By measuring, the characteristics of the magnet material before magnetization can be predicted.

  That is, the Hall element array 801 bent in accordance with the radius of curvature of the magnet material 701 is arranged in the vertical direction on the paper surface, and the magnet material holder 102 is placed on the paper surface by the driving device 104 so as to be orthogonal to the Hall element array. It is possible to measure the magnetic flux density distribution of the magnet material 701 while driving in parallel directions and applying a magnetic field from the iron core 206. Since the tip of the iron core 206 is bent according to the radius of curvature of the magnet material 701, there is an effect that the magnetic field applied to the magnet material 701 becomes uniform.

  The shape of the iron core 206 may be a rectangular parallelepiped, and in that case, there is an effect that the structure of the iron core can be simplified.

  Further, as shown in FIG. 9A, a Hall element array in which Hall elements are arranged in a line on a curve in accordance with the radius of curvature of the magnet material is shown. Hall element arrays having other configurations arranged in a matrix are also possible. In addition, when arranged in a plurality of rows, the moving amount of the magnet material by the driving device can be reduced, which has the effect of shortening the measurement time.

  Furthermore, a magnetic sensor array may be used using another magnetic sensor, for example, an MR element (magnetoresistance element) instead of the Hall element. Further, the movement mechanism has been described as moving the magnet material. However, since the magnet material only needs to move relatively between the Hall element array and the iron core, for example, the magnet material is fixed and the Hall element array is fixed. The magnetic flux density distribution of the magnet material may be measured using other driving methods such as moving the iron core.

  FIG. 10 shows another embodiment of the present invention. Depending on the type and components of the magnet material 103, it may be difficult to determine the quality of the magnet material by a change in the magnetic flux density with respect to the minute applied magnetic field. In that case, it is necessary to apply a larger magnetic field to the magnet material to determine the quality of the magnet material. On the other hand, a large magnetic field generator is required to generate a large magnetic field. For this reason, it is considered effective to perform measurement in a state in which the magnetic material easily transmits a magnetic field, that is, in a state in which domain wall movement and magnetization reversal are easy.

  The magnetic flux density measuring apparatus shown in FIG. 10 shows an example of a simple magnetic flux density measuring apparatus having a structure including a heater 901 for heating a magnet. In this embodiment, the magnetic flux density distribution of the magnet is measured with the heater 901 while the magnet material is heated. After the heater 901 is adjacent to the Hall element array and the magnet material is heated, the magnetic flux density distribution is measured. The heater 901 has a structure in which only the magnet material is enclosed by a heat insulating material so that the measurement of the Hall element array is not affected by heat. Further, the interval between the Hall element array and the magnet material is determined within a range not affected by the heat of the magnet material. The heater 901 can be used if the heat insulation such as a cartridge heater or a high frequency heating coil can be performed.

  FIG. 11 shows a process flow for measuring the magnetic flux density distribution of the magnet material with the measuring apparatus shown in FIG. In FIG. 11, first, the heater 901 is heated to a predetermined temperature (S04). Next, a current is passed through the iron core to generate a magnetic field (S05). In this state, the magnet material is moved from the heater side (S06), and after the magnet material passes over the heater, the magnetic flux density distribution is measured by passing between the iron core and the hall element array. Then, after measuring the magnetic flux density distribution for a predetermined number N (S07), cooling is performed by a cooling mechanism (such as a cooling fan) (S08). The temperature to be heated by the heater is not uniquely determined because it varies depending on the type and shape of the magnet material, but heating at about 50 ° C. is also effective, and in that case, natural cooling after measurement may be used.

  In the embodiment described above, the in-plane of the magnet material is measured by measuring the magnetization that has passed through the magnet material from the magnetic field generator while moving the magnet material in a direction orthogonal to the direction in which the Hall element array is arranged. The magnetic flux density distribution was measured.

  Here, the in-plane magnetic flux density distribution of the magnet material generally has a characteristic that the four corners (corners) of the magnet material are large, as shown in FIG. The magnetic properties of the magnet material tend to be determined by the values at the four corners. Therefore, in this embodiment, the magnetic properties of the magnet after magnetizing the magnet material are predicted and the magnet material is selected by measuring the magnetic flux density at least at the four corners (corners) of the magnet material. As a result, the measurement time can be shortened and the measurement apparatus can be simplified.

  Also, as shown in FIG. 12, in the in-plane magnetic flux density distribution, the values of the four sides of the magnet material are relatively large with respect to the other parts, so that the accuracy is improved compared with the case of only four corners (corners). In addition, the magnetic flux density distribution on the four sides of the magnet material may be measured.

  Although the embodiments have been described above, the present invention is not limited to the above-described embodiments, and includes various modifications. For example, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described. Further, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. Moreover, it is also possible to add, delete, and replace other configurations for a part of the configuration of each embodiment.

101, 801 ... Hall element array, 102 ... Magnet material holder,
103, 701 ... Unmagnetized magnet material, 104 ... Magnet material holder drive control mechanism,
105 ... Coil, 106, 206 ... Iron core (core), 107 ... Housing, 201 ... Hall element,
202 ... Amplifier, 203, 204 ... Substrate, 205 ... Magnetic field, 601 ... Magnet, 901 ... Heater

Claims (11)

  The magnetized surface of the magnet material before magnetization is brought close to the magnetic field generator, the magnetic flux density transmitted through the magnet material from the magnetic field generator is measured, and the magnet after magnetization of the magnet material is measured from the distribution of the magnetic flux density Magnetic material selection method characterized by predicting and selecting the magnetic properties of magnets. A method of selecting a magnet material according to claim 1,
Magnetic material selection characterized in that magnetic flux density at four corners of the magnet material before magnetization is measured as magnetic flux density distribution to predict and select magnetic properties of the magnet material after magnetization of the magnet material Method. A permanent magnet motor comprising a magnet sorted using the magnet material sorting method according to claim 1. A magnetic field generator for applying a magnetic field to the magnetized surface of the magnet material before magnetization;
A magnetization measuring unit for measuring a magnetic flux density transmitted through the magnet material;
A structure in which the magnetic field generator and the magnetization measuring unit are fixed at a certain interval;
A moving mechanism in which the magnet material relatively moves between the magnetic field generator and the magnetization measuring unit;
A magnetic measurement apparatus for measuring a magnetic flux density distribution of a magnet material before magnetization. The magnetic measurement apparatus according to claim 4,
The magnetization measuring unit is configured by a magnetic sensor array in which a plurality of magnetic sensors are arranged. The magnetic measurement apparatus according to claim 5,
The magnetic measurement apparatus, wherein the magnetic sensor is a Hall element. The magnetic measurement apparatus according to any one of claims 4 to 6,
The magnet material has a rectangular cross-sectional shape, and the moving mechanism causes the magnet material to relatively linearly move between the magnetic field generator and the magnetization measuring unit. The magnetic measurement apparatus according to any one of claims 4 to 6,
The magnet material has a curved cross-sectional shape, and the moving mechanism causes the magnet material to relatively rotate and move between the magnetic field generator and the magnetization measuring unit along the curvature radius of the curved cross-section of the magnet material. Magnetic measuring device characterized by. The magnetic measurement apparatus according to any one of claims 4 to 6,
The magnet material has a curved cross-sectional shape,
The magnetic field generator and the magnetization measuring unit have a curved shape along the curvature radius of the curved cross section of the magnet material,
The magnetic measuring apparatus according to claim 1, wherein the moving material causes the magnet material to relatively linearly move between the magnetic field generator and the magnetization measuring unit. The magnetic measurement apparatus according to any one of claims 4 to 9,
It also has a heater
A magnetic measurement apparatus for measuring a magnetic flux density transmitted through the magnet material while the magnet material is heated by the heater. The magnetic measurement apparatus according to any one of claims 4 to 10,
A magnetic measuring apparatus for measuring magnetic flux densities at four corners of the magnet material before magnetization.

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