JP5709695B2 - Stress-load type single plate magnetic tester - Google Patents

Description

  The present invention relates to a stress load type single plate magnetic tester.

  Conventionally, electromagnetic steel sheets have been used as iron cores for electromagnetic devices such as generators, transformers and motors. This magnetic steel sheet is evaluated for magnetic characteristics by measuring iron loss characteristics, AC magnetization characteristics, apparent power characteristics, and the like. As a method for that purpose, the “magnetic sheet single-sheet magnetic property test method” is standardized in Japanese Industrial Standards (see Non-Patent Document 1).

  In the “Magnetic Steel Sheet Single Sheet Magnetic Characteristic Testing Method” defined in this Japanese Industrial Standard, a rectangular flat magnetic steel sheet is used as a single plate sample, and the single plate sample is placed in the windings of an exciting coil and a B coil. Then, the yoke is brought into contact with the single plate sample to constitute a closed magnetic circuit (see FIG. 6). In this magnetic steel sheet single plate magnetic property test method, the yoke is brought into contact with the single plate sample so that the distribution of the magnetic field applied to the single plate sample and the distribution of the magnetic flux inside the single plate sample approach uniformly.

  And in a magnetic sheet single sheet magnetic characteristic test method, the magnetic flux density of a single sheet sample is measured using a B coil. The magnetic field strength of a single plate sample is measured by the H coil method or the excitation current method. In the H coil method, two H pieces are separated from each other by a predetermined distance below or above the single plate sample. H coil pairs made of coils are arranged, and the magnetic field strength of a single plate sample is calculated using the magnetic field strength measured by each H coil and the distance between each H coil and the single plate sample.

  The magnetic properties of electrical steel sheets can be tested by using the above “magnetic steel sheet single sheet magnetic property test method”. However, electrical steel sheets that are incorporated into actual electromagnetic equipment as iron cores, etc., can be internally processed or assembled. Stress remains or acts.

  For this reason, conventionally, a single-plate magnetic property test similar to that described above is performed with a stress applied to a single-plate sample made of an electromagnetic steel plate, and the magnetic properties of the electromagnetic steel plate in a state where it is used as an actual electromagnetic device. The characteristics are tested (for example, see Patent Document 1).

Japanese Industrial Standards JIS C2556 “Magnetic Steel Sheet Single Sheet Magnetic Properties Test Method”

JP-A-8-145951

  In the electromagnetic steel sheet single plate magnetic property test method described above, the distribution of the magnetic field applied to the single plate sample and the distribution of the magnetic flux inside the single plate sample are made close to each other by bringing the yoke into contact with the single plate sample.

  However, when stress is applied to the single plate sample, the single plate sample is deformed by tension or compression, and the single plate sample and the yoke cannot be satisfactorily brought into contact with each other. The distribution of magnetic flux inside the single plate sample becomes non-uniform, making it difficult to accurately test the magnetic properties of the electromagnetic steel sheet.

Therefore, in the present invention according to claim 1, in a stress-loading type single plate magnetic tester for applying a stress to a single plate sample and testing magnetic characteristics in a state where the yoke is in contact with the single plate sample, contacting the veneer sample by advancing and retracting together with measuring the contact force between the veneer sample and the yoke, have a yoke adjustment mechanism capable of adjusting a contact force between the veneer sample and the yoke, the magnetic properties test Even when the single plate sample is deformed by applying stress to the single plate sample, the magnetic characteristics are tested while adjusting the contact force between the single plate sample and the yoke by the yoke adjusting mechanism .

  Moreover, in this invention which concerns on Claim 2, in this invention which concerns on the said Claim 1, it decided to have a pair of holder which clamps both surfaces of the said single plate sample.

  Further, in the present invention according to claim 3, in the present invention according to claim 2, an H coil is provided in each holder, and an H coil pair is constituted by H coils arranged on both surfaces of a single plate sample. .

  In the present invention according to claim 4, in the present invention according to claim 2 or claim 3, a gap compensation coil is provided in the holder.

  In the present invention, in a stress-loading type single plate magnetic tester for applying a stress to a single plate sample and testing the magnetic properties in a state where the yoke is in contact with the single plate sample, Since it has a yoke adjustment mechanism for adjusting the contact force, even if the single plate sample is deformed by applying stress to the single plate sample, the contact force between the single plate sample and the yoke is controlled by the yoke adjustment mechanism. Therefore, the single plate sample and the yoke can be brought into good contact with each other, and the magnetic field distribution applied to the single plate sample and the magnetic flux distribution inside the single plate sample can be made close to each other so that the magnetic properties of the electromagnetic steel sheet can be adjusted. Properties can be accurately tested.

The schematic diagram which shows the structure of the stress load type | mold single plate magnetic tester which concerns on this invention. The test circuit diagram. The plane sectional view showing the coil unit of a stress load type single plate magnetic tester. FIG. The disassembled perspective view which shows the holder of a coil unit. A test circuit diagram of the “magnetic sheet single-sheet magnetic property test method” defined by Japanese Industrial Standards.

  Hereinafter, a specific configuration of the stress load type single plate magnetic tester according to the present invention will be described with reference to the drawings.

  As shown in FIG. 1, a stress-loading type single-plate magnetic tester 1 is brought into contact with a single-plate sample 2 and a stress-loading mechanism 3 for applying a stress to a single-plate sample 2 made of a rectangular flat electromagnetic steel plate. A yoke adjusting mechanism 5 for adjusting the contact force of the yoke 4 and a measuring mechanism 6 for measuring the magnetic properties of the single plate sample 2 are schematically configured to apply stress to the single plate sample 2 and to provide a single plate sample. The magnetic characteristics of the single plate sample 2 can be measured with the yoke 4 in contact with the magnetic plate 2.

  The stress load mechanism 3 has a fixed clamp 8 and a movable clamp 9 that hold both ends of the single plate sample 2 facing each other inside the casing 7, and a cylinder 10 is attached to the casing 7. A moving clamp 9 is attached to the tip of the advance / retreat rod 11. Then, by moving the forward / backward rod 11 of the cylinder 10 forward or backward, the single plate sample 2 held at both ends by the fixed side clamp 8 and the moving side clamp 9 is compressed or pulled, and the single plate sample 2 is subjected to compressive stress or The tensile stress can be applied.

  In addition, the stress load mechanism 3 is provided with various measuring instruments 12 so as to measure changes in the length (sample length) of the single plate sample 2 and stress acting on the single plate sample 2.

  Furthermore, the stress load mechanism 3 has clamp fixtures 13 and 14 attached to the casing 7, and the fixed clamp 8 and the movable clamp 9 are fixed to the clamp fixtures 13 and 14, respectively. The stress generated by the magnetostriction can be measured with the distance between the moving side clamp 9 and the sample length of the single plate sample 2 constant.

  In the yoke adjusting mechanism 5, the yoke 4 is constituted by a pair of yoke bodies 15, 16 disposed on both sides of the single plate sample 2.

  The yoke adjusting mechanism 5 fixes one yoke body 15 to the casing 7 and attaches the other yoke body 16 to the tip of the forward / backward rod 18 of the cylinder 17 fixed to the casing 7.

  Further, the yoke adjusting mechanism 5 is provided with a measuring device 19 so that the contact force between the both end faces of the yoke 4 (yoke bodies 15 and 16) and the single plate sample 2 can be measured.

  The yoke adjusting mechanism 5 can hold the both surfaces of the single plate sample 2 with a desired contact force between both end surfaces of the pair of yoke bodies 15 and 16 by moving the advance / retreat rod 18 of the cylinder 17 forward or backward. The contact force between the yoke 4 and the single plate sample 2 at that time can be adjusted.

  In the yoke adjusting mechanism 5, the yoke 4 is not limited to a case where a pair of yoke bodies 15, 16 form a double yoke, and a single yoke may be formed by only one yoke body 16, or a vertical yoke. It may be a mold yoke or a horizontal yoke. Further, the invention is not limited to the case where only one yoke body 16 is moved, and both yoke bodies 15 and 16 may be moved.

  The measuring mechanism 6 is connected to the coil unit 20 with a measuring device 21 constituting the test circuit shown in FIG. Here, as the test circuit, a test circuit used in the “magnetic sheet single sheet magnetic property test method” defined by the Japanese Industrial Standards shown in FIG. 6 may be used. In the test circuit shown in FIG. 6, the B coil 23 'and the H coil pair 24' are placed in the winding of the excitation coil 22 ', and the primary coil of the air gap compensation coil 25' composed of a mutual induction coil is used as the excitation coil. 2 'is connected in series, and the secondary coil of the air gap compensation coil 25' is connected in series with the B coil 23 'in reverse phase. In the test circuit shown in FIG. The B coil 23 and the H coil pair 24 are placed on the same, and the air gap compensation coil 25 is connected in series with the B coil 23 in reverse phase.

  As shown in FIGS. 3 to 5, the coil unit 20 accommodates the excitation coil 22, B coil 23, H coil pair 24, and air gap compensation coil 25 of the test circuit shown in FIG. A single-plate sample 2 is inserted through the center of the plate with both ends exposed. In the coil unit 20, a unit holder 26 is detachably attached to the casing 7.

  The unit holder 26 includes a hollow excitation coil holder 27 in which the excitation coil 22 is wound around the outer periphery, a hollow B coil holder 28 in which the B coil 23 is wound around the outer periphery, an H coil pair 24, and a gap compensation coil 25. The H coil holder 29 is configured to hold the coil coil unit 28 by inserting the B coil holder 28 into the hollow part of the exciting coil holder 27 and inserting the H coil holder 29 into the hollow part of the B coil holder 28. 20 is formed integrally.

  The H coil holder 29 that holds the H coil pair 24 is composed of a pair of holders 30 and 31 that sandwich both sides of the single-plate sample 2, and each H coil 32 that constitutes the H coil pair 24 by the holders 30 and 31. Holds 33.

  Each of the holders 30 and 31 has a rectangular flat plate shape shorter than the sample length of the single-plate sample 2, and an H coil holding groove 34 for holding the H coils 32 and 33 is formed at the center of the surface, and the H coil is held. Convex positioning pieces 35, 35 are formed at both ends of the groove 34, and communication grooves 36, 36 are formed on both sides of the positioning pieces 35, 35 so as to communicate with the H coil holding groove 34 from the ends of the holders 30, 31. ing.

  The H coils 32 and 33 held by the holders 30 and 31 are wound around the central portion of a rectangular flat coil frame 37. The gap compensation coil 25 is also wound around the coil frame 37 on both sides of the H coils 32 and 33. The gap compensation coil 25 is not necessarily provided on both sides of the H coils 32 and 33, and may be provided only on one side depending on the measurement region of the single plate sample 2.

  The H coil holder 29 accommodates the coil frame 37 around which the H coils 32 and 33 are wound inside the H coil holding groove 34 of each holder 30 and 31 (between a pair of positioning pieces 35 and 35). The H coils 32 and 33 and the gap compensation coil 25 can be positioned and held at predetermined positions. As a result, the H coils 32, 33 and the gap compensation coil 25 are not affected by the deformation of the single plate sample 2, and the positional relationship between the coils 32, 33, 25 and the single plate sample 2 is close and appropriate distance. Therefore, the measurement accuracy of the magnetic characteristics can be improved.

  In addition, the H coil holder 29 uses the communication grooves 36 formed in the holders 30 and 31 so that the wiring of the H coils 32 and 33 and the air gap compensation coil 25 can be drawn to the outside.

  The H coil holder 29 may be used with both holders 30 and 31 facing upward as shown in FIG. 5, and each holder 30 and 31 or both holders 30 and 31 may be used facing downward. . When the holders 30 and 31 are used facing downward, the communication groove 36 is positioned on the front surface side of the single plate sample 2, so that the strain gauge and its wiring adhered to the single plate sample 2 are connected to the communication groove 36. It is possible to insert through.

  The stress load type single plate magnetic tester 1 is configured as described above. The stress load type single plate magnetic tester 1 applies stress to the single plate sample 2 using the stress load mechanism 3 and also uses the yoke adjustment mechanism 5 to apply the single plate sample. 2, the yoke bodies 15 and 16 of the yoke 4 are brought into contact with each other, and the magnetic characteristics of the single plate sample 2 are tested using the measuring mechanism 6 in this state. Thereby, the magnetic characteristic of the electrical steel sheet in the state used as an actual electromagnetic device can be tested.

  In the stress-loading type single-plate magnetic tester 1, even if the single-plate sample 2 is deformed by applying stress to the single-plate sample 2, the yoke adjusting mechanism 5 contacts the single-plate sample 2 and the yoke 4. The power can be adjusted.

  Therefore, in the stress-load type single plate magnetic tester 1, the single plate sample 2 and the yoke 4 can be satisfactorily brought into contact with each other, and the distribution of the magnetic field applied to the single plate sample 2 and the magnetic flux inside the single plate sample 2 can be reduced. The magnetic properties of the electrical steel sheet can be accurately tested by making the distribution close to uniform.

  Further, in the stress load type single plate magnetic tester 1, since the both sides of the single plate sample 2 are sandwiched between the pair of holders 30 and 31, the single plate sample 2 is bent and deformed by the pair of holders 30 and 31. As a result, deformation of the single plate sample 2 can be prevented and the magnetic characteristics can be measured with high accuracy.

  In the stress-load type single plate magnetic tester 1, the magnetic field strength of the single plate sample 2 can be measured by the H coil method or the excitation current method. It is also possible to measure the magnetic field strength of the single plate sample 2 using the H coil pair 24 constituted by the H coils 32 and 33 disposed on both surfaces of the single plate sample 2 by providing the coils 32 and 33.

  In the measurement of the magnetic field strength by the conventional H coil method, since the two H coils constituting the H coil pair are respectively arranged on one side of the single plate sample at a predetermined distance, the single plate sample and the H coil are arranged. If the distance is inaccurate or the magnetic field distribution differs between the front and back surfaces of the single plate sample, the magnetic field strength may not be measured accurately. However, when the magnetic field strength of the single plate sample 2 is measured using the H coil pair 24 composed of the H coils 32 and 33 arranged on both surfaces of the single plate sample 2, the single plate sample 2 and the H coils 32 and 33 are measured. The magnetic field strength of the single plate sample 2 can be flexibly measured from the average value and the minimum value of the magnetic field strength measured by the respective H coils 32 and 33, regardless of the distance between them and the magnetic field distribution on the front and back of the single plate sample 2. Can do.

  Furthermore, in the stress load type single plate magnetic tester 1, a test circuit used in the “magnetic sheet single plate magnetic property test method” defined by the Japanese Industrial Standard shown in FIG. 6 can be used. As shown in FIG. 2, a test circuit in which the air gap compensation coil 25 is connected in series with the B coil 23 in a reverse phase is used.

  In the conventional test circuit, in order to use the air gap compensation coil 25 ′ composed of the mutual induction coil, it is necessary that there is no magnetic body around it, and it is arranged outside the exciting coil 22 ′. In the test circuit shown in FIG. 1, the air gap compensation coil 25 can be downsized, and the air gap compensation coil 25 can be provided in the holders 30 and 31 and arranged in the winding of the exciting coil 22. Accordingly, the test circuit shown in FIG. 2 can easily control the excitation waveform at a high magnetic flux density and can perform compensation corresponding to the actual magnetic field in the uniform magnetic field inside the excitation coil 22. Accuracy can be improved.

  The configurations of the holders 30 and 31 and the configuration of the test circuit shown in FIG. 2 are applicable not only to the stress-loaded single-plate magnetic tester 1 but also to a tester that tests the magnetic properties of an electrical steel sheet without applying stress. can do.

DESCRIPTION OF SYMBOLS 1 Stress load type single plate magnetic tester 2 Single plate sample 3 Stress load mechanism 4 Yoke 5 Yoke adjustment mechanism 6 Measurement mechanism 7 Casing 8 Fixed side clamp 9 Moving side clamp 10 Cylinder
11 Advance rod 12 Measuring instrument
13,14 Clamp fixture 15,16 Yoke body
17 cylinder 18 retraction rod
19 Measuring instrument 20 Coil unit
21 Measuring instrument 22,22 'Excitation coil
23,23 'B coil 24,24' H coil pair
25,25 'Air gap compensation coil 26 Unit holder
27 Excitation coil holder 28 B coil holder
29 H coil holder 30,31 holder
32,33 H coil 34 H coil holding groove
35 Positioning piece 36 Communication groove
37 Coil frame

Claims (4)

In a stress-loaded single-plate magnetic tester for testing magnetic properties while applying a stress to a single-plate sample and contacting a yoke to the single-plate sample,
By advancing and retracting the yoke in contact with the veneer sample, while measuring the contact force between the veneer sample and the yoke, have a yoke adjustment mechanism capable of adjusting a contact force between the veneer sample and the yoke,
It is characterized by testing the magnetic properties while adjusting the contact force between the single plate sample and the yoke with the yoke adjustment mechanism even if the single plate sample is deformed by applying stress to the single plate sample during the magnetic property test. Stress loaded single plate magnetic tester.   The stress-loading type single plate magnetic tester according to claim 1, further comprising a pair of holders for holding both sides of the single plate sample.   The stress-loading type single plate magnetic tester according to claim 2, wherein an H coil is provided in each holder, and an H coil pair is configured by H coils arranged on both sides of a single plate sample. The stress load type single plate magnetic tester according to claim 2 or 3, wherein a gap compensation coil is provided in the holder.

Images