JP2019066408A - Single-sheet magnetic property tester and single-sheet magnetic property testing system - Google Patents

Abstract

To provide a single-sheet magnetic property tester capable of accurately measuring magnetic properties of a test piece under external force.SOLUTION: At least either of upper winding frame 131 and lower winding frame 132, respectively wound with an excitation coil 141 and a flux density detection coil 142, is moved in its height direction (Z-axis direction) to bring the upper winding frame 131 and the lower winding frame 132 into contact, preferably tight contact, with a test piece S.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a single-plate magnetic property tester and a single-plate magnetic property test system, and is particularly suitable for measuring the magnetic properties of a soft magnetic material such as a magnetic steel sheet.

  A single plate tester is used to measure the magnetic properties of a soft magnetic material such as a magnetic steel sheet. The single plate tester is also referred to as a single plate magnetic characteristic tester, a single plate magnetic tester, or the like. Hereinafter, the single-plate tester is referred to as a single-plate magnetic characteristic tester. In Non-Patent Document 1, as a winding frame of a single-plate magnetic characteristic tester, the shape is a hollow rectangular shape penetrating in the longitudinal direction, and a length thereof corresponds to the size of the single-plate magnetic characteristic tester, etc. The winding frame which is determined length is indicated. The winding frame is also referred to as a winding frame or the like. In the following description, the winding frame is referred to as a winding frame.

  In the technique described in Non-Patent Document 1, a primary coil and a secondary coil are wound around a winding frame. The primary coil is also referred to as an excitation coil or the like. In the following description, the primary coil is referred to as an excitation coil. The secondary coil is also referred to as a magnetic flux density detection coil, a B coil or the like. In the following description, the secondary coil is referred to as a magnetic flux density detection coil.

  In the single-plate magnetic property tester, a single-plate test piece (one soft magnetic material plate) is disposed in the hollow portion of the winding frame, and a closed magnetic path is configured by the test piece and the yoke. . Then, the magnetic flux density generated in the test piece by exciting the test piece by supplying an exciting current to the exciting coil is determined based on the induced electromotive force induced in the magnetic flux density detection coil. In the following description, the plate of the soft magnetic material is referred to as a soft magnetic plate, as needed.

JP 2012-141203 A

JIS C 2556: 2015 “Measuring method of magnetic properties of electromagnetic steel strip with single plate tester”

  By the way, when performing a winding operation of winding a coil around a wound iron core, a soft magnetic material plate bent at a certain curvature is forced to be flat. In addition, since the piled iron core is configured by stacking the soft magnetic material plates, the non-flat soft magnetic material plates are forced to be flat. As described above, it is required to measure the magnetic characteristics of the soft magnetic material plate when the soft magnetic material plate which is not flat is forced to be flat. When the soft magnetic material plate is forced to be flat, distortion is introduced to the soft magnetic material plate, so that it is possible to evaluate how this distortion affects the magnetic characteristics. is there.

  In this case, in the single-plate magnetic property tester, it is necessary to measure the magnetic property of the test piece while correcting the non-flat test piece to a flat state. However, in the technique described in Non-Patent Document 1, it is not easy to correct a non-flat test piece to a flat state because the dimensions of the winding frame are determined.

  For example, it is conceivable to deform the shape of the test piece by inserting a flat plate into the hollow portion of the winding frame (between the inner wall surface of the winding frame and the test piece). However, since the flat plate is inserted into the hollow portion of the winding frame, a large stress is applied to the winding frame. Therefore, the winding frame must be configured to withstand this pressure. In addition, it is not easy to determine the size and shape of the flat plate to be inserted into the hollow portion of the winding frame so that the test piece can be made flat. Therefore, it is not easy to apply uniform pressure to the entire test piece.

In addition, it is conceivable to arrange the bag in the hollow portion of the winding frame (between the inner wall surface of the winding frame and the test piece) and introduce air into the bag to deform the shape of the test piece. However, in this case as well, since the winding frame is heavily stressed, the winding frame must be configured to withstand this pressure. In addition, it is not easy to apply uniform pressure to the entire test piece because the test piece is pressurized by putting air in the bag.
As described above, in the technique described in Non-Patent Document 1, there is a problem that it is not easy to measure the magnetic characteristics of a test piece having a non-flat shape in a flat state.

  In the single-plate magnetic property tester, it is also performed to measure the magnetic property when the test piece is excited as described above in the state where the compressive stress is applied to the test piece. Patent Document 1 describes a technique for applying a compressive stress in an excitation direction to a test piece in a state in which the test piece has a curved shape with the excitation direction in the test piece as an axis. According to Patent Document 1, even if compressive stress in the excitation direction is applied to the test piece in this manner, buckling of the test piece can be suppressed.

However, in the technique described in Patent Document 1, the test piece is curved. For this reason, stress due to this curvature is introduced to the test piece. Therefore, there is a problem that the magnetic characteristics of the test piece can not be measured in a state in which the stress other than the compressive stress applied in the excitation direction is eliminated.
As described above, in the conventional single-plate magnetic characteristic tester, there is a problem that the magnetic characteristics of the test piece in a state where an external force is applied can not be accurately measured.

  The present invention has been made in view of the above problems, and it is an object of the present invention to provide a single-plate magnetic characteristic tester capable of accurately measuring the magnetic characteristics of a test piece in a state where an external force is applied. I assume.

The single-plate magnetic characteristic tester of the present invention is a single-plate magnetic characteristic tester that measures the magnetic characteristics of the test piece using one magnetic plate as a test piece, and is wound around the test piece. An excitation coil for exciting the test piece; a magnetic flux density detection coil wound around the test piece and detecting a magnetic flux density inside the excited test piece; the test piece A first winding frame disposed at a position opposite to one of the plate surfaces, and in which a portion of the excitation coil and the magnetic flux density detection coil on one side of the plate surface of the test piece is disposed; A second winding frame disposed at a position facing the other of the plate surface of the piece, in which a portion of the excitation coil and the magnetic flux density detection coil on the other side of the plate surface of the test piece is disposed; At least one of the first winding frame and the second winding frame Either one is moved in the thickness direction of the test piece such that the first winding frame and the second winding frame are in contact with the test piece directly or through a member. I assume.
The single-plate magnetic property test system of the present invention comprises the single-plate magnetic property tester and a stress application means for applying a stress to the test piece in the excitation direction of the test piece, the stress application means The magnetic characteristics of the test piece are measured by the single-plate magnetic property tester while stress is applied to the test piece in the excitation direction.

  According to the present invention, it is possible to provide a single-plate magnetic characteristic tester capable of accurately measuring the magnetic characteristics of a test piece in a state in which an external force is applied.

FIG. 1 shows a first embodiment and is a perspective view showing an example of a schematic configuration of a single-plate magnetic characteristic tester. FIG. 2 shows the first embodiment, and is a view of a single-plate magnetic property tester as viewed along the lateral direction of a test piece. FIG. 3 shows the first embodiment, and is a view showing an example of a cross section of the tester main body when cut in a direction perpendicular to the longitudinal direction of the tester main body in the longitudinal center of the tester main body. FIG. 4 shows the first embodiment and is a view showing an example of a cross section of the tester main body in the case of being cut in a direction perpendicular to the latitudinal direction of the tester main body in the center of the latitudinal direction of the tester main body. is there. FIG. 5 shows the first embodiment, and is a view for explaining an example of the winding method of the excitation coil and the magnetic flux density detection coil. FIG. 6 shows a second embodiment and is a view showing an example of a cross section of the tester main body when cut in a direction perpendicular to the longitudinal direction of the tester main body in the longitudinal center of the tester main body. FIG. 7 shows a second embodiment and is a view for explaining an example of how to wind a magnetic flux density detection coil. FIG. 8 shows a third embodiment and is a view showing an example of a cross section of the tester main body when cut in a direction perpendicular to the longitudinal direction of the tester main body in the longitudinal center of the tester main body. FIG. 9 shows a third embodiment, and is a view of the upper excitation coil and the lower excitation coil as viewed along the thickness direction of the test piece. FIG. 10 shows the fourth embodiment and is a view showing an example of the configuration of a single-plate magnetic characteristic test system.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In each of the drawings, the configuration is simplified or omitted as necessary for convenience of explanation and notation. Moreover, in each figure, the X-axis, the Y-axis, and the Z-axis show the relationship of the direction of each figure, and those with a circle in ○ go from the back side to the front side of the sheet The direction is indicated, and a circle with a cross indicates a direction from the near side to the far side of the drawing.

First Embodiment
First, the first embodiment will be described.
FIG. 1 is a perspective view showing an example of a schematic configuration of a single-plate magnetic property tester. FIG. 1A is a view showing a schematic configuration of a single-plate magnetic characteristic tester of a vertical single yoke. FIG. 1B is a view showing a schematic configuration of a single-plate magnetic characteristic tester of a vertical double yoke. FIG. 1 (c) is a view showing a schematic configuration of a single-plate magnetic characteristic tester with a horizontal single yoke. FIG. 1D is a view showing a schematic configuration of a single-plate magnetic characteristic tester of a horizontal double yoke.

  In FIG. 1A to FIG. 1D, the single-plate magnetic characteristic tester has a tester main body 100 and yoke yokes Y, Y1, Y2. As shown in FIGS. 1 (a) to 1 (d), a closed magnetic circuit is constituted by the test piece S of a single plate and the yokes Y, Y1, Y2. As shown in FIGS. 1 (a) to 1 (d), the tester main body 100 of the present embodiment is applied to any single-plate magnetic characteristic tester shown in FIGS. 1 (a) to 1 (d). It can be applied to any single board tester. The test piece S is a single plate (one plate) having a rectangular planar shape, and is configured using a soft magnetic material such as a directional electromagnetic steel plate or a nondirectional electromagnetic steel plate. The test piece S is arranged such that its longitudinal direction is the X axis direction, its short side direction (width direction) is the Y axis direction, and its thickness direction is the Z axis direction.

The tester main body 100 of the present embodiment will be described below. In the present embodiment, a single-plate magnetic characteristic tester for a vertical double yoke shown in FIG. 1B will be described as an example.
FIG. 2 is a view (viewed along the Y-axis direction) of the single-plate magnetic characteristic tester of the vertical double yoke shown in FIG. 1B viewed along the short side direction of the test piece S. FIG. 3 shows an example of the cross section of the test device main body 100 when it is cut in a direction perpendicular to the longitudinal direction (X axis direction) of the test device main body 100 at the center of the test device main body 100 in the longitudinal direction (X axis direction). It is a figure (sectional drawing at the time of cutting in the part shown by II of FIG. 2) shown. FIG. 4 is a view showing an example of a cross section of the test device main body 100 when it is cut in a direction perpendicular to the short side direction of the test device main body 100 at the center of the short side direction (Y axis direction) of the test device main body 100 It is sectional drawing at the time of cutting in the part shown by II-II of FIG.

  In FIGS. 1 to 4, the tester body 100 includes an upper anvil 111, a lower anvil 112, tightening members 121 to 126, an upper winding frame 131, a lower winding frame 132, an excitation coil 141, and a magnetic flux density detection coil 142, It has insulating sheets 151, 152, 161, 162.

The upper anvil 111 and the lower anvil 112 are arranged at intervals in the thickness direction (Z-axis direction) of the test piece S. The upper anvil 111 and the lower anvil 112 have a rectangular parallelepiped shape. The longitudinal direction of the upper anvil 111 and the lower anvil 112 is the X-axis direction, the short direction is the Y-axis direction, and the height direction is the Z-axis direction.
The upper anvil 111 and the lower anvil 112 are made of a nonmagnetic material. In addition, the upper anvil 111 and the lower anvil 112 have a strength that does not deform when the upper winding frame 131 and the lower winding frame 132 are pressed from above and below as described later. The upper anvil 111 and the lower anvil 112 are made of, for example, austenitic stainless steel or titanium.

  As shown in FIG. 3, both sides of the upper anvil 111 and the lower anvil 112 in the latitudinal direction (Y-axis direction) are located inward at a predetermined distance from the latitudinal end in the transversal direction. The through holes penetrating in the height direction (Z-axis direction) are respectively formed to be opposed to each other. As will be described later, a bolt which is one of the fastening members 121 to 126 is passed through the through hole. As shown in FIG. 1, in the present embodiment, a case where such a through hole is formed in three places along the longitudinal direction (X-axis direction) of the upper anvil 111 and the lower anvil 112 is exemplified. (The number of through holes is six in each of the upper anvil 111 and the lower anvil 112). The through hole formed in the upper anvil 111 and the through hole formed in the lower anvil 112 are formed at mutually opposing positions in the height direction (Z-axis direction).

  In FIGS. 1 to 3, the fastening members 121 to 126 have bolts and nuts. The bolts are through holes formed in the upper anvil 111 and the lower anvil 112, and are inserted into mutually facing through holes in the height direction (Z-axis direction) of the upper anvil 111 and the lower anvil 112. A nut is attached to the tip of the bolt inserted into the through hole. In the present embodiment, there are six sets of through holes at positions facing each other in the height direction (Z-axis direction) of the upper anvil 111 and the lower anvil 112. A bolt and a nut are attached to each of the set of through holes.

  Fixing one of the bolt and the nut and tightening the other narrows the distance between the head of the bolt and the nut. Also, by loosening the other, the distance between the bolt head and the nut is increased. Thus, the distance between the upper anvil 111 and the lower anvil 112 in the height direction (Z-axis direction) is adjusted. The tightening members 121 to 126 have washers, bushes and the like in addition to bolts and nuts. The bush is insulating and insulates between the bolt of the clamping members 121 to 126 and the upper anvil 111.

  In FIGS. 3 and 4, the upper winding frame 131 is attached to the surface of the upper anvil 111 facing the lower anvil 112 with the insulating sheet 161 interposed therebetween. The lower winding frame 132 is attached to the surface of the lower anvil 112 facing the upper anvil 111 with the insulating sheet 162 interposed therebetween. The upper winding frame 131 and the lower winding frame 132 have a rectangular parallelepiped shape. The longitudinal direction of the upper winding frame 131 and the lower winding frame 132 is the X-axis direction, the short direction is the Y-axis direction, and the height direction is the Z-axis direction.

  The upper winding frame 131 and the lower winding frame 132 are made of a nonmagnetic and insulating material. In addition, the upper winding frame 131 and the lower winding frame 132 have a strength that does not deform when they are pressed from above and below using the upper anvil 111, the lower anvil 112, and the tightening members 121 to 126 as described later. The upper winding frame 131 and the lower winding frame 132 are configured using, for example, a phenol resin or a glass epoxy resin.

  In FIG. 4, a first recess is formed on the surface of the upper winding frame 131 facing the upper anvil 111. A first recess is also formed on the surface of the lower winding frame 132 facing the lower anvil 112. The exciting coil 141 is inserted into the first recess. As shown in FIG. 5, the exciting coil 141 is spirally wound so that the coil axis (virtual line passing through the center of the loop formed by the coil) is parallel to the longitudinal direction (X-axis direction) of the test piece S And be configured. The shape, size, and position of the first recess formed in the upper winding frame 131 and the lower winding frame 132 are determined so as to fit the shape of such an excitation coil 141. The insulating sheets 161 and 162 protect the exciting coil 141 and ensure insulation between the upper anvil 111 and the lower anvil 112, so that the lower anvil 112 and the lower winding are wound between the upper anvil 111 and the upper winding frame 131. They are respectively disposed between the line frame 132 and the line frame 132.

  A second recess is formed on the surface of the upper winding frame 131 facing the lower winding frame 132 (test piece S). A second recess is also formed on the surface of the lower winding frame 132 facing the upper winding frame 131 (test piece S). A magnetic flux density detection coil 142 is inserted in the second recess. As shown in FIG. 5, the magnetic flux density detection coil 142 is configured by being spirally wound so that the coil axis is parallel to the longitudinal direction (X-axis direction) X-axis direction of the test piece S. The shape, size, and position of the second recess formed in the upper winding frame 131 and the lower winding frame 132 are determined so as to fit the shape of the magnetic flux density detection coil 142. Insulating sheets 151 and 152 protect magnetic flux density detection coil 142 and, in order to ensure insulation with test piece S, a surface of upper winding frame 131 facing lower winding frame 132 (test piece S). The lower winding frame 132 is disposed on the surface facing the upper winding frame 131 (test piece S).

  The exciting coil 141 is a coil disposed so as to surround the test piece S, and is a coil through which an exciting current for exciting the test piece S flows. The magnetic flux density detection coil 142 is a coil disposed so as to surround the test piece S, and is a coil for detecting the magnetic flux density inside the excited test piece S. From the induced electromotive force induced at both ends of the magnetic flux density detection coil 142, the magnetic flux density inside the test strip S is determined. As shown in FIGS. 2 to 4, the exciting coil 141 is disposed outside the magnetic flux density detection coil 142.

  The coil axes of the excitation coil 141 and the magnetic flux density detection coil 142 are preferably substantially coaxial, and more preferably coaxial. This is because the magnetic flux density detection coil 142 can be disposed in a region where the magnetic flux generated from the exciting coil 141 is large and uniform. The coil axis of the exciting coil 141 and the axis of the test piece S (virtual line passing through the center of the test piece S and extending in the longitudinal direction (X axis)) preferably substantially match, and more preferably match preferable. This is because the test piece S can be disposed in a region where the magnetic flux generated from the exciting coil 141 is large and uniform.

  Further, in the present embodiment, a stranded wire is used as a wire forming the excitation coil 141 and the magnetic flux density detection coil 142. The exciting coil 141 and the magnetic flux density detecting coil 142 are preferably wires of a stranded wire such as a Teflon (registered trademark) -coated wire or the like, to which a flexible insulating coating is applied. While being able to protect an electric wire, it is because insulation of an electric wire can be ensured more reliably. In the case of using a stranded wire with an insulating coating as the exciting coil 141 and the magnetic flux density detection coil 142, the insulating sheets 151, 152, 161, and 162 may not be used. In this case, for example, the wire of the stranded wire on which the insulating coating is applied is fixed to the first recess and the second recess using an adhesive or the like.

Next, an example of how to use the tester main body 100 of the present embodiment will be described. FIG. 3A is a view showing the state of the tester main body 100 at the time of test preparation. FIG. 3B is a view showing the state of the tester main body 100 at the time of the test.
As shown in FIG. 3 (a), before starting the test, loosen the bolts of the tightening members 121 to 126 to make a test piece S in a space formed between the upper winding frame 131 and the lower winding frame 132. Place. When the test piece S is placed at a predetermined position, the bolts of the tightening members 121 to 126 are tightened, and the upper winding frame 131 and the lower winding frame 132 are pressed from above and below by the upper anvil 111 and the lower anvil 112. Then, until the upper winding frame 131 (insulation sheet 151) and the lower winding frame 132 (insulation sheet 152) are in close contact with the test piece S, the distance between the upper winding frame 131 and the lower winding frame 132 is Reduce. For example, the bolts of the tightening members 121 to 126 are tightened until the distance between the upper winding frame 131 (insulation sheet 151) and the lower winding frame 132 (insulation sheet 152) becomes a predetermined length. . The predetermined length is the thickness of the test piece S, the height (length in the Z-axis direction) of the upper winding frame 131 and the lower winding frame 132, and the thickness of the insulating sheets 151, 152, 161, 162 It can be determined based on the sum of That is, until the length of the distance between the upper winding frame 131 (insulation sheet 151) and the lower winding frame 132 (insulation sheet 152) becomes such a length that the test piece S can be regarded as being flat, Tighten the bolts of the tightening members 121-126. After the upper winding frame 131 (insulation sheet 151) and the lower winding frame 132 (insulation sheet 152) are brought into contact (preferably in close contact) with the test piece S in this way, an exciting current is supplied to the exciting coil 141 The magnetic properties of piece S are measured.

  As described above, when the space between the upper winding frame 131 (insulation sheet 151) and the lower winding frame 132 (insulation sheet 152) decreases, the exciting coil 141 and the magnetic flux density detection coil 142 are deformed. Therefore, as described above, in the present embodiment, the excitation coil 141 and the magnetic flux density detection coil 142 are configured using twisted wires so that the excitation coil 141 and the magnetic flux density detection coil 142 have flexibility. Further, in FIG. 3B, portions of the excitation coil 141 and the magnetic flux density detection coil 142 which are not included in the first recess and the second recess formed in the upper winding frame 131 and the lower winding frame 132. But they may approach each other. In this case, if the wires constituting the exciting coil 141 and the magnetic flux density detection coil 142 are not subjected to the insulating process, the insulation of the exciting coil 141 and the magnetic flux density detection coil 142 may not be maintained. Further, in the case where the electric wire constituting excitation coil 141 and magnetic flux density detection coil 142 is not insulated and the bolts of tightening members 121 to 126 are not insulated by an insulation bush or the like, excitation coil 141 and There is a possibility that insulation between the magnetic flux density detection coil 142 and the tightening members 121 to 126 can not be maintained. Therefore, it is preferable to constitute the exciting coil 141 and the magnetic flux density detection coil 142 using a stranded wire having a flexible insulating coating.

  In the present embodiment, in the above operation, the positions in the height direction (Z-axis direction) of the lower anvil 112 and the lower winding frame 132 are fixed, and the upper anvil 111 and the upper winding frame 131 have their heights. It shall move in the direction (Z-axis direction). However, the positions of the upper anvil 111 and the upper winding frame 131 in the height direction (Z-axis direction) are fixed, and the lower anvil 112 and the lower winding frame 132 are in the height direction (Z-axis direction). The upper anvil 111 and the upper winding frame 131, and the lower anvil 112 and the lower winding frame 132 may both move in the height direction (Z-axis direction). The upper anvil 111 and the lower anvil 112 may be moved in the height direction (Z-axis direction) using an electric machine, a hydraulic machine or a pneumatic machine without using the bolts of the tightening members 121 to 126. The upper winding frame 131 and the lower winding frame 132 may be pressed from above and below by the upper anvil 111 and the lower anvil 112.

  As described above, in the present embodiment, at least one of the upper winding frame 131 and the lower winding frame 132 around which the exciting coil 141 and the magnetic flux density detection coil 142 are wound is in the height direction (Z-axis direction) The upper winding frame 131 and the lower winding frame 132 are brought into contact (preferably in close contact) with the test piece S. Therefore, even if a flat plate, an air bag or the like is not inserted in the hollow portion of the winding frame, the test piece S can be flattened by applying a pressure as uniform as possible to the entire test piece S. Therefore, from the result of the measurement of the magnetic property using the single-plate magnetic property tester of this embodiment, for example, it is accurate how the flattening of the non-flat test piece S contributes to the magnetic property. Can be grasped.

Second Embodiment
Next, a second embodiment will be described. In the single-plate magnetic characteristic tester, it is performed to remove the induced electromotive force based on the magnetic flux generated in the air gap surrounded by the magnetic flux density detection coil from the induced electromotive force generated in the magnetic flux density detection coil (this explanation will be made in the following description). Is called air gap compensation). Although non-patent document 1 describes that air gap compensation is performed by a mutual inductor, in the present embodiment, a case where a magnetic flux density detection coil itself has a function of air gap compensation will be described. As described above, the configuration of the magnetic flux density detection coil is mainly different between the present embodiment and the first embodiment. Therefore, in the description of the present embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals as those in FIGS. 1 to 5, and the detailed description is omitted.

FIG. 6 shows an example of a cross section of the test device main body 600 when it is cut in a direction perpendicular to the longitudinal direction (X axis direction) of the test device main body 600 at the center of the test device main body 600 in the longitudinal direction (X axis direction). FIG. Specifically, FIG. 6A shows the state of the tester main body 600 at the time of test preparation. FIG. 6B is a view showing the state of the tester main body 600 at the time of the test. 6 corresponds to a cross-sectional view in a case where it is cut at a portion indicated by I-I in FIG.
The tester main body 600 of the present embodiment has a magnetic flux density detection coil 642 shown in FIG. 6 in place of the magnetic flux density detection coil 142 of the first embodiment.

  The present inventors do not subtract the induced electromotive force induced in the air gap compensation coil provided in the mutual inductor etc. from the induced electromotive force induced in the magnetic flux density detection coil as in the technique described in Non-Patent Document 1 It has been found that when the excitation current is supplied to the excitation coil without the test piece S, it is preferable to prevent the induced electromotive force from being generated in the magnetic flux density detection coil. For this purpose, the present inventors form a plurality of loops in each cycle when periodically winding a metal body such as a copper wire to form a magnetic flux density detection coil, and when there is no test piece It has been found that the plurality of loops may be formed such that the magnetic flux generated by the flow of current through the plurality of loops is cancelled. In a state where the test piece is disposed in any one of the plurality of loops formed in this way, the induced electromotive force induced in the magnetic flux density detection coil when exciting the test piece is caused by supplying an exciting current to the exciting coil. If it is measured, the induced electromotive force to be measured is not due to the magnetic flux flowing through the air gap, but only due to the magnetic flux flowing through the test piece.

The magnetic flux density detection coil 642 is configured based on the new findings of the present inventors as described above. FIG. 7 is a view for explaining an example of how the magnetic flux density detection coil 642 is wound.
In FIG. 7, the magnetic flux density detection coil 642 includes a plurality of magnetic flux density detection coil portions 701 a to 701 c and a plurality of air gap compensation coil portions 702 a to 702 c.

  In the following description, each of the plurality of magnetic flux density detection coil portions 701a to 701c will be referred to as the magnetic flux density detection coil portion 701 as necessary, and each of the plurality of air gap compensation coil portions 702a to 702c will be described. When necessary, the gap compensation coil unit 702 is referred to. In the following description, an imaginary line passing through the centers of the loops constituting the magnetic flux density detection coil section 701 and the air gap compensation coil section 702 will be referred to as the axis of the coil section as necessary. In FIG. 7, the axes of the magnetic flux density detection coil section 701 are axes 711, and the axes of the air gap compensation coil section 702 are axes 712 a and 712 b, respectively.

  Note that, for convenience of description and explanation, in FIG. 7, the loop constituting the air gap compensation coil portions 702 a to 702 c is shown larger than that of the air gap compensation coil portion 702 shown in FIG. 6. Further, FIG. 7 shows an example in which the number of the magnetic flux density detection coil portions 701 and the number of the air gap compensation coil portions 702 are three for convenience of description and description. However, the number of the magnetic flux density detection coil portions 701 and the number of the air gap compensation coil portions 702 are not limited to “3”.

  7, the first end 721 of the magnetic flux density detection coil section 701 and the first end 731 of the air gap compensation coil section 702, and the second end 722 of the magnetic flux density detection coil section 701 and the air gap compensation coil The second end portion 732 of the portion 702 is connected to each other such that the magnetic flux density detection coil portion 701 and the air gap compensation coil portion 702 have opposite polarities.

  Further, the third end 723 of the magnetic flux density detection coil section 701 and the third end 733 of the air gap compensation coil section 702, the fourth end 724 of the magnetic flux density detection coil section 701, and the air gap compensation coil section 702 The magnetic flux density detection coil portion 701 and the air gap compensation coil portion 702 are mutually connected to the fourth end portion 734 so as to have reverse polarity.

  That is, when current flows through the magnetic flux density detection coil 642, the direction of the magnetic flux generated from the magnetic flux density detection coil 701 and the direction of the magnetic flux generated from the air gap compensation coil 702 become mutually opposite. The magnetic flux density detection coil portion 701 and the air gap compensation coil portion 702 are connected to each other such that the magnetic fluxes face each other in a destructive direction. In the example shown in FIG. 7, when current flows as indicated by arrows (矢 印) attached on the magnetic flux density detection coil 642 (magnetic flux density detection coil section 701 and air gap compensation coil section 702), magnetic flux density detection The magnetic flux flows in the direction of the arrow line attached to penetrate the inside of the coil portion 701 and the air gap compensation coil portion 702.

  A set of the magnetic flux density detection coil section 701 and the air gap compensation coil section 702 as described above is connected in series so that a plurality of sets have forward polarity. That is, when current flows through the magnetic flux density detection coil 642, the directions of the magnetic flux generated from the magnetic flux density detection coil portions 701 of each set become the same (that is, these magnetic fluxes become mutually reinforcing) And each set is connected in series so that the direction of the magnetic flux generated from each set of air gap compensation coil sections 702 is the same.

  Then, when connecting the set of the magnetic flux density detection coil section 701 and the air gap compensation coil section 702 in series, the number of turns of the loop constituting the magnetic flux density detection coil section 701 is “1” in each set, The number of turns of the loop constituting the air gap compensation coil section 702 is “2”.

  Further, the shaft 711 of the magnetic flux density detection coil unit 701 and the shafts 712 a and 712 b of the air gap compensation coil unit 702 mutually cross each other in the excitation direction of the test piece S (the short direction of the test piece S (Y axis direction)) Be parallel at distant locations. As shown in FIG. 7, the loop constituting the magnetic flux density detection coil section 701 and the loop constituting the air gap compensation coil section 702 are viewed along the directions (X-axis direction) of their axes 711, 712a, 712b. (Ie, in the plane perpendicular to the axes 711, 712a, 712b (Y-Z plane)), at least the area where the test piece S is placed does not overlap, so that all areas do not overlap Is preferred.

  Here, an example of each set of connections will be described with reference to FIG. 7. In the example shown in FIG. 7, the winding starts from the fifth end 745 of the air gap compensation coil portion 702a in the set of the magnetic flux density detection coil portion 701a and the air gap compensation coil portion 702a. The sixth end 746 of the air gap compensation coil portion 702a in the set of the magnetic flux density detection coil portion 701a and the air gap compensation coil portion 702a and the set of the magnetic flux density detection coil portion 701b and the air gap compensation coil portion 702b The fifth end 755 of the air gap compensation coil section 702b is connected to each other. Similarly, a set of the sixth end 756 of the air gap compensation coil portion 702b in the set of the magnetic flux density detection coil portion 701b and the air gap compensation coil portion 702b, and a set of the magnetic flux density detection coil portion 701c and the air gap compensation coil portion 702c. And the fifth end 765 of the air gap compensation coil portion 702c are mutually connected. Then, the winding ends at the sixth end 766 of the gap compensating coil portion 702c in the combination of the magnetic flux density detection coil portion 701c and the gap compensating coil portion 702c.

  In the present embodiment, as a wire constituting the magnetic flux density detection coil 642, a stranded electric wire is used in the same manner as the magnetic flux density detection coil 142 of the first embodiment. Further, it is preferable that the magnetic flux density detection coil 642 be a stranded wire, such as a Teflon-coated wire, to which a flexible insulating coating is applied. Thus, the magnetic flux density detection coil 642 is configured to be integrated using a pair of stranded wires. Therefore, in the description of FIG. 7, the magnetic flux density detection coil portion 701 and the air gap compensation coil portion 702 which are separated from each other are not necessarily connected. Further, in FIG. 7, for convenience of description, a state in which a part of the portion (the first end to the sixth end described above) to which the magnetic flux density detection coil portion 701 and the air gap compensation coil portion 702 are connected is separated. As shown in, this part is connected. Further, as described above, the magnetic flux density detection coil section 701 and the air gap compensation coil section 702 form a loop that produces magnetic flux in the opposite direction to each other. The position of the portion (the first end to the sixth end described above) to which the magnetic flux density detection coil portion 701 and the air gap compensation coil portion 702 are connected may be a position that can be the boundary of the loop. It can not be in one position.

  Here, in the area of the loop constituting the magnetic flux density detection coil section 701, the number of turns constituting the air gap compensation coil section 702 is two (two on both sides of the loop constituting the magnetic flux density detection coil section 701). It is preferable to approximate the sum of the area of the loop). The area of the loop is the area of the so-called coil surface, and, for example, the area of the shape when the contour of the magnetic flux density detection coil section 701 in FIG. 6 is approximated by a predetermined shape (for example, an ellipse or a rectangle) The area of the loop constituting the magnetic flux density detection coil section 701 can be set as This is the same for the air gap compensation coil section 702.

  By configuring the magnetic flux density detection coil section 701 and the air gap compensation coil section 702 as described above, in each group without the test piece S, the magnetic flux density detection coil section 701 and the air gap compensation coil section The magnetic flux generated by the current flow in 702 is canceled, and the induced electromotive force induced in the magnetic flux density detection coil 642 can be made close to “0 (zero)”. Therefore, the induced electromotive force induced in the magnetic flux density detection coil 642 in the state where the test piece S is disposed inside the magnetic flux density detection coil section 701 becomes the air gap compensated induced electromotive force, and the magnetic flux inside the test specimen S It can approach to the induced electromotive force based only on the change of density.

Here, the loop area constituting the magnetic flux density detection coil section 701 and the number of turns constituting the air gap compensation coil section 702 are two loops (on both sides of the loop constituting the magnetic flux density detection coil section 701 If the sum of the area of the loop) can be made equal, the induced electromotive force induced in the magnetic flux density detection coil 642 becomes approximately "0 (zero)" (preferably "0 (zero)"). Therefore, the induced electromotive force induced in the magnetic flux density detection coil 642 when the test piece S is disposed inside the magnetic flux density detection coil portion 701 is only the induced electromotive force based on the change in the magnetic flux density inside the test specimen S. become. Further, by increasing the number of turns of the loop constituting the air gap compensation coil section 702 in each group, the area of the loop constituting the magnetic flux density detection coil section 701 and the air gap compensation coil section 702 are configured in each group. The induced electromotive force induced in the magnetic flux density detection coil 642 can be made substantially “0 (zero)” (preferably “0 (zero)”) even if it is equal to the sum of the loop areas.
As in Non-Patent Document 1, the total number of turns of the loop constituting the magnetic flux density detection coil section 701 functioning as the magnetic flux density detection coil of the single plate magnetic property tester is set in accordance with the characteristics of the measuring device. For example, it can be made 20 times or more. Further, in the same set, the number of turns of the loop constituting the magnetic flux density detection coil unit 701 may be two or more.

  When a mutual inductor is used as in the technique described in Non-Patent Document 1, it is necessary to add a coil for air gap compensation. The inductance of this additional coil may cause a delay in the phase of the induced electromotive force induced in the magnetic flux density detection coil. The leakage of magnetic flux from the additional coil also causes the phase of the induced electromotive force induced in the magnetic flux density detection coil to be shifted. Furthermore, the capacitance generated between the additional coil and the flux density detection coil also causes the induced electromotive force induced in the flux density detection coil to be out of phase. In some cases, this capacitance may cause the circuit to resonate. Furthermore, the presence of the additional coil may cause noise to be superimposed on the signal of the induced electromotive force induced in the magnetic flux density detection coil.

  On the other hand, in the present embodiment, since the air gap compensation can be performed without using a mutual inductor, a coil different from the magnetic flux density detection coil is not necessary to perform the air gap compensation. Therefore, the induced electromotive force induced in the magnetic flux density detection coil 642 has a phase shift, noise is superimposed on the induced electromotive force induced in the magnetic flux density detection coil 642, and the circuit including the magnetic flux density detection coil 642 is Resonance can be suppressed.

Third Embodiment
Next, a third embodiment will be described. In the first embodiment and the second embodiment, the case where a stranded wire is used as the wire constituting the excitation coil 141 and the magnetic flux density detection coil 142 has been described as an example. On the other hand, in the present embodiment, each of the exciting coil and the magnetic flux density detection coil is separated (cut) by the portion disposed in the upper winding frame and the portion disposed in the lower winding frame (assumed) Form the electrodes in the separation part of the case. Then, when the gap between the upper winding frame and the lower winding frame is narrowed until the test piece S comes into close contact with the tester body when using the tester body, the excitation coil and the magnetic flux density detection coil are configured as follows: The electrode formed on the upper winding frame and the electrode formed on the lower winding frame are electrically connected. As described above, the configurations of the excitation coil and the magnetic flux density detection coil are mainly different between the present embodiment and the first and second embodiments. Therefore, in the description of the present embodiment, the same parts as those in the first embodiment and the second embodiment are denoted by the same reference numerals as those in FIGS. Do. Here, the case where the winding method of the exciting coil and the magnetic flux density detection coil is the winding method described in the first embodiment will be described as an example.

  FIG. 8 shows an example of a cross section of the tester main body 800 when it is cut in a direction perpendicular to the longitudinal direction (X axis direction) of the tester main body 800 at the center of the tester main body 800 in the longitudinal direction (X axis direction). FIG. Specifically, FIG. 8A is a view showing the state of the tester main body 800 at the time of test preparation. FIG. 8B is a view showing the state of the tester main body 800 at the time of the test. FIG. 8 is a diagram corresponding to FIG. Note that FIG. 8 corresponds to a cross-sectional view in the case of being cut at a portion indicated by I-I in FIG.

  The tester main body 800 according to the present embodiment includes an upper winding frame 831 and a lower winding instead of the upper winding frame 131, the lower winding frame 132, the excitation coil 141, the magnetic flux density detection coil 142, and the insulating sheets 151 and 152. A frame 832, an excitation coil 841, a magnetic flux density detection coil 842, and insulating sheets 851 and 852 are provided. Moreover, the tester main body 800 of the present embodiment does not have the insulating sheets 161 and 162 disposed between the upper winding frame 831 and the upper anvil 111. In FIG. 8, for convenience of description, the tightening members 121 to 126 are not shown, but the tightening members 121 to 126 are the same as those described in the first embodiment. The upper anvil 111 and the lower anvil 112 are also the same as those described in the first embodiment.

  In FIG. 8, the upper winding frame 831 is attached to the surface of the upper anvil 111 facing the lower anvil 112. The lower winding frame 832 is attached to the surface of the lower anvil 112 facing the upper anvil 111. The upper winding frame 831 and the lower winding frame 832 have a rectangular parallelepiped shape. The longitudinal direction of the upper winding frame 831 and the lower winding frame 832 is the X axis direction, the short direction is the Y axis direction, and the height direction is the Z axis direction.

  The upper winding frame 831 and the lower winding frame 832 are made of a nonmagnetic and insulating material. In addition, the upper winding frame 831 and the lower winding frame 832 have a strength not to be deformed when they are pressed from the upper and lower sides by using the upper anvil 111, the lower anvil 112, and the tightening members 121 to 126. The upper winding frame 831 and the lower winding frame 832 are configured using, for example, a phenol resin or a glass epoxy resin.

  In FIG. 8, holes are formed in the direction substantially parallel to the plate surface (X-Y plane) of the test piece S in the region inside the upper winding frame 831 and in the region on the upper anvil 111 side. . In addition, a hole reaching from the hole to a surface of upper winding frame 831 facing lower winding frame 832 (test piece S) in a direction substantially parallel to the thickness direction (Z-axis direction) of test piece S A part is formed. A hole is also formed in the direction substantially parallel to the plate surface (X-Y plane) of the test piece S in the region inside the lower winding frame 832 and in the region on the lower anvil 112 side. In addition, a hole that reaches from the hole to a surface of lower winding frame 832 facing upper winding frame 831 (test piece S) in a direction substantially parallel to the thickness direction (Z-axis direction) of test piece S. A part is formed.

  An upper excitation coil 841 a is disposed in a hole formed in the upper winding frame 831. A lower excitation coil 841 b is disposed in a hole formed in the lower winding frame 832. FIG. 9 is a view of the upper excitation coil 841a and the lower excitation coil 841b viewed along the thickness direction of the test piece (Z-axis direction). In FIG. 9, the lower excitation coil 841b is indicated by a broken line. FIG. 8 is a cross-sectional view taken along the line III-III in FIG.

  The excitation coil 841 spirally wound around the test piece S so that the coil axis is substantially parallel to the longitudinal direction (X-axis direction) of the test piece S is split in half along the coil axis (cutting One of them is the upper excitation coil 841a, and the other is the lower excitation coil 841b. The shapes, sizes, and positions of the holes of the upper winding frame 831 and the lower winding frame 832 are determined so as to fit the shapes of the upper excitation coil 841a and the lower excitation coil 841b.

  In the upper winding frame 831 and the lower winding frame 832, the hole portion formed in a direction substantially parallel to the thickness direction (Z-axis direction) of the test piece S is a region of the upper excitation coil 841a and the lower excitation coil 841b. Then, it extends in a direction substantially parallel to the thickness direction (Z-axis direction) of the test piece S from the region corresponding to the separation portion (cutting portion) of the exciting coil 841. As described above, of the upper excitation coil 841a and the lower excitation coil 841b, the portion extending in the direction substantially parallel to the thickness direction (Z-axis direction) of the test piece S is the thickness direction of the test piece S (Z-axis direction And a hole formed in a direction substantially parallel to On the other hand, the other parts of the upper excitation coil 841a and the lower excitation coil 841b are formed in a direction substantially parallel to the plate surface (X-Y plane) of the test piece S in the upper excitation coil 841a and the lower excitation coil 841b. It is placed in the hole. In FIG. 9, portions shown by solid lines and broken lines are portions disposed in holes formed in a direction substantially parallel to the plate surface (X-Y plane) of the test piece S.

Electrodes 861a, 861b, 862a, 862b are disposed in the region corresponding to the separation portion of the excitation coil 841 in the region of the upper excitation coil 841a and the lower excitation coil 841b.
As shown in FIG. 8, the electrodes 861a and 861b are provided with projections so that the electrodes 861a to 861b and 862a to 862b opposed to each other in the thickness direction (Z-axis direction) of the test piece S are reliably connected. A part is formed. For example, the protrusion is made to expand and contract as a spring, and in the state where no external force is applied, the height becomes higher than the maximum value of the thickness assumed as the thickness of the test piece S It is preferable to make it shrink more than the minimum value of thickness assumed as thickness.

  A recess is formed on the surface of the upper winding frame 831 facing the lower winding frame 832 (test piece S). A recess is also formed on the surface of the lower winding frame 132 facing the upper winding frame 831 (test piece S). An upper magnetic flux density detection coil 842a is disposed in a recess formed in the upper winding frame 831. A lower magnetic flux density detection coil 842 b is disposed in the recess formed as the lower winding frame 832. A magnetic flux density detection coil 842 is helically wound around the test piece S so that the coil axis is substantially parallel to the longitudinal direction (X-axis direction) of the test piece S inside the exciting coil 841. One of the half separated (cut) along the coil axis is the upper magnetic flux density detection coil 842a, and the other is the lower magnetic flux density detection coil 842b. The shapes, sizes and positions of the concave portions of the upper winding frame 831 and the lower winding frame 832 are determined so as to fit the shapes of the upper magnetic flux density detection coil 842a and the lower magnetic flux density detection coil 842b.

Electrodes 863a, 863b, 864a and 864b are disposed in the regions of the upper magnetic flux density detection coil 842a and the lower magnetic flux density detection coil 842b corresponding to the separation portion of the magnetic flux density detection coil 842. As shown in FIG. 9, the electrodes 863a and 863b are provided with projections so that the electrodes 863a to 863b and 864a to 864b opposed to each other in the thickness direction (Z-axis direction) of the test piece S are reliably connected. A part is formed. For example, the protrusion is made to expand and contract as a spring, and in the state where no external force is applied, the height becomes higher than the maximum value of the thickness assumed as the thickness of the test piece S It is preferable to make it shrink more than the minimum value of thickness assumed as thickness.
The upper magnetic flux density detection coil 842a and the lower magnetic flux density detection coil 842b viewed along the thickness direction (Z-axis direction) of the test piece S are 841a, 841b, 861a, 861b, 862a, in FIG. 862b are respectively made as 842a, 842b, 863a, 863b, 864a, 864b.

  As described in the first embodiment, the coil axes of the excitation coil 841 and the magnetic flux density detection coil 842 are preferably substantially coaxial, and more preferably coaxial. Preferably, the coil axes of the excitation coil 841 and the magnetic flux density detection coil 842 substantially coincide with the axis of the test piece S (virtual line passing through the center of the test piece S and extending in the longitudinal direction (X axis)). , It is more preferable to match.

  The insulating sheets 851 and 852 protect the upper magnetic flux density detection coil 842a and the lower magnetic flux density detection coil 842b, respectively, and secure insulation between the upper magnetic flux density detection coil 842a and the lower magnetic flux density detection coil 842b and the test piece S. It is for. However, the insulating sheets 851 and 852 are not disposed in the regions of the electrodes 863a, 863b, 864a and 864b. That is, the insulating sheet 851 (852) is an electrode at least in the region of the surface of the upper magnetic flux density detection coil 842a (lower magnetic flux density detection coil 842b) facing the lower winding frame 832 (upper winding frame 831). 863a and 863b (864a and 864b) are arranged in the area except for.

The usage method of the tester main body 800 of this embodiment is the same as that of the tester main body 100 of 1st Embodiment.
That is, as shown in FIG. 8 (a), before starting the test, loosen the bolts of the tightening members 121 to 126, and test in the space formed between the upper winding frame 831 and the lower winding frame 832. Arrange the piece S. When the test piece S is placed at a predetermined position, the bolts of the tightening members 121 to 126 are tightened, and the upper winding frame 831 and the lower winding frame 832 are pressed from above and below by the upper anvil 111 and the lower anvil 112. Then, until the upper winding frame 831 (the insulating sheet 851) and the lower winding frame 832 (the insulating sheet 852) are in close contact with the test piece S, the distance between the upper winding frame 831 and the lower winding frame 832 is Reduce. For example, the bolts of the tightening members 121 to 126 are tightened until the distance between the upper winding frame 831 (insulating sheet 851) and the lower winding frame 832 (insulating sheet 852) becomes a predetermined length. . The predetermined length can be determined based on the thickness of the test piece S. That is, until the length of the distance between the upper winding frame 831 (insulation sheet 851) and the lower winding frame 832 (insulation sheet 852) becomes such that the test piece S can be regarded as being flat, Tighten the bolts of the tightening members 121-126. Then, the electrodes 861a to 861b, 862a to 862b, 863a to 863b, and 864a to 864b, which face each other in the thickness direction (Z-axis direction) of the test piece S, are electrically connected, whereby the exciting coil 841 and the magnetic flux density A detection coil 842 is formed. After the upper winding frame 831 (insulation sheet 851) and the lower winding frame 832 (insulation sheet 852) are thus brought into contact (preferably in close contact) with the test piece S, an exciting current is supplied to the exciting coil 841 The magnetic properties of piece S are measured.

  Unlike the first embodiment, in the present embodiment, when the distance between the upper winding frame 831 (the insulating sheet 851) and the lower winding frame 832 (the insulating sheet 852) decreases, the exciting coil and the magnetic flux density detection coil 842 does not deform except for the projection. Therefore, in the present embodiment, the excitation coil and the magnetic flux density detection coil 842 can be configured by a single wire (may be configured by a stranded wire).

  As described above, in the present embodiment, one of the excitation coil 841 and the magnetic flux density detection coil 842 is divided into halves along the coil axis, and the other is disposed in the upper winding frame 831 and the lower winding frame 832. Electrodes 861a, 861b, 862a, 862b, 863a, 863b, 864a, 864b are provided in regions corresponding to the separation portions. Then, when the distance between the upper winding frame 831 and the lower winding frame 832 is narrowed until the test piece S comes into close contact when the tester body 800 is used, the exciting coil 841 and the magnetic flux density detection coil 842 are configured. To electrically connect the electrodes 861a, 861b, 863a, 863b disposed in the upper winding frame 831 and the electrodes 862a, 862b, 864a, 864b in a portion disposed in the lower winding frame 832. . Therefore, in addition to the effects described in the first embodiment, an effect is obtained that the magnetic flux density detection coil 842 does not have to have flexibility. Further, since the magnetic flux density detection coil 842 can be made to approach the test piece S, an effect that the air gap surrounded by the magnetic flux density detection coil 842 can be reduced can also be obtained.

  In the present embodiment, the winding method of the exciting coil 141 and the magnetic flux density detection coil 142 of the first embodiment has been described as an example, but in the case of the winding method of the magnetic flux density detection coil 642 of the second embodiment. The method of this embodiment can also be applied. That is, in FIG. 7, the first end 721 of the magnetic flux density detection coil section 701 and the first end of the air gap compensation coil section 702 in the same manner as the magnetic flux density detection coil 642 is wound. 731 and the second end 722 of the magnetic flux density detection coil unit 701 and the second end 732 of the air gap compensation coil unit 702, and the third end 723 of the magnetic flux density detection coil unit 701 and the air gap compensation The third end 733 of the coil section 702, the fourth end 724 of the magnetic flux density detection coil section 701, and the fourth end 734 of the air gap compensation coil section 702, and the sixth of the air gap compensation coil section 702 Between the end 746, 756 and the fifth end 755, 765 of the air gap compensation coil portion 702, and the opposite side of the fifth end 755, 765 and the sixth end 746, 756 of the air gap compensation coil portion 702. of Ri and barbs 771-773, in one of the case where the separation (cut) Place the other to the upper winding frame to the lower winding frame, providing electrodes in areas corresponding to those of the separating portion. Then, when the distance between the upper winding frame and the lower winding frame is narrowed until the test piece S comes into close contact, an electrode and a lower portion formed on the upper winding frame so as to constitute a magnetic flux density detection coil The electrodes formed on the winding frame are electrically connected.

Fourth Embodiment
Next, a fourth embodiment will be described. In the present embodiment, the single plate described in the first to third embodiments in a state where stress (compressive stress or tensile stress) is applied to the test piece S in the excitation direction (longitudinal direction of the test piece S) The case of measuring the magnetic property of the test piece S using a magnetic property tester will be described. As described above, in this embodiment, a configuration for applying a stress to the test piece S is added to the single-plate magnetic characteristic tester described in the first to third embodiments. Therefore, in the description of the present embodiment, the same components as those in the first to third embodiments are denoted by the same reference numerals as those in FIGS. 1 to 9, and detailed description thereof will be omitted. Here, the single-plate magnetic characteristic tester described in the first embodiment will be described as an example.

  FIG. 10 is a view showing an example of the configuration of a single-plate magnetic characteristic test system. In FIG. 10, the single-plate magnetic characteristic tester is a view of the single-plate magnetic characteristic tester of the vertical double yoke shown in FIG. 1 (b) seen along the short direction of the test piece S (along the Y-axis direction). View) (FIG. 10 corresponds to FIG. 2). In FIG. 10, the single-plate magnetic characteristic test system includes the single-plate magnetic characteristic tester described in the first embodiment and stress application devices 1001 and 1002.

  In the first embodiment, the length in the longitudinal direction (X-axis direction) of the test piece S is substantially the same as the length in the longitudinal direction (X-axis direction) of the yokes Y1 and Y2. On the other hand, in the fourth embodiment, the length in the longitudinal direction (X-axis direction) of the test piece S is longer than the length in the longitudinal direction (X-axis direction) of the yokes Y1 and Y2. One end of the test piece S in the longitudinal direction is set to the stress application device 1001, and the other end is set to the stress application device 1002.

  The stress application devices 1001 and 1002 grip one end and the other end of the test strip S in the excitation direction (longitudinal direction of the test strip S, the X-axis direction), and excite the test strip S It is a device that applies stress in the direction (X-axis direction). The stress may be compressive stress or tensile stress, or may be compressive stress only, tensile stress only, or compressive stress and tensile stress successively. Also, the magnitude of the stress may be constant or may change with the passage of time.

The magnetic characteristics of the test piece S are measured by the single-plate magnetic characteristic tester when the test pieces S are applied in the excitation direction by the stress application devices 1001 and 1002 as described above.
For example, since the stator core of a rotating electrical machine such as a motor is fixed by shrink fitting or the like, a compressive stress of about 100 MPa to 200 MPa is applied to the magnetic steel sheet constituting the stator core. By measuring the magnetic characteristics of the electromagnetic steel sheet in a state in which such compressive stress is applied, it is possible to grasp the deterioration of the magnetic characteristics of the electromagnetic steel sheet due to the application of the compressive stress.

  In the single-plate magnetic characteristic tester according to the first embodiment, the plate surface of the test piece S is sandwiched from above and below by the upper winding frame 131 and the lower winding frame 132. Even if it adds, it can suppress that the test piece S is buckled. Further, as in the technique described in Patent Document 1, since it is not necessary to bend the test piece S, the magnetic characteristics of the test piece S are eliminated in the state where the stress other than the stress other than the compressive stress applied in the excitation direction is eliminated. Can be measured. Therefore, when the soft magnetic plate is applied to an electric device, the deterioration of the magnetic characteristics due to the stress assumed to be added to the soft magnetic plate can be accurately grasped.

  Although the single-plate magnetic characteristic tester according to the first embodiment has been described as an example in the present embodiment, the stress application devices 1001 and 1002 are also applied to the single-plate magnetic characteristic tester according to the second to fourth embodiments. Thus, the magnetic characteristics of the test piece S can be measured while applying stress to the test piece S in the excitation direction (longitudinal direction, X-axis direction). The test piece S may be fixed by gripping the other end of the test piece S in the longitudinal direction (X-axis direction) without using the stress application device 1002.

  The embodiments of the present invention described above are merely examples of implementation for carrying out the present invention, and the technical scope of the present invention should not be interpreted in a limited manner by these. is there. That is, the present invention can be implemented in various forms without departing from the technical idea or the main features thereof.

(Relationship with claim)
Hereinafter, an example of the relationship between the description of the claims and the description of the embodiment will be described. As described above, the description of the claims is not limited to the description of the embodiment.
The first winding frame is realized, for example, by using upper winding frames 131 and 831.
One of the plate surfaces of the test piece corresponds to, for example, the plate surface on the positive direction side of the Z axis among the plate surfaces of the test piece S.
Of the exciting coil and the magnetic flux density detection coil, the portion on one side of the plate surface of the test piece is, for example, a portion of the exciting coil 141 that can be inserted into the first recess of the upper winding frame 131, the exciting coil The portion of the magnetic flux density detection coils 142 and 642 that can be inserted into the second winding portion of the upper winding frame 131, and the upper portion of the magnetic flux density detection coil 842. This corresponds to the part of the winding frame 831 that can be inserted into the recess.
The second winding frame is realized, for example, by using lower winding frames 132 and 832.
The other of the plate surfaces of the test piece corresponds, for example, to the plate surface on the negative direction side of the Z axis among the plate surfaces of the test piece S.
The portion of the excitation coil and the magnetic flux density detection coil on the other side of the plate surface of the test piece is, for example, a portion of the excitation coil 141 that can be inserted into the first recess of the lower winding frame 132, the excitation coil The portion of 841 that can be inserted into the hole of lower winding frame 832, the portion of magnetic flux density detection coils 142 and 642 that can be inserted into the second recess of lower winding frame 132, the lower portion of magnetic flux density detection coil 842 This corresponds to the part of the winding frame 832 that can be inserted into the recess.
The first excitation coil unit is realized, for example, by using the upper excitation coil 841a.
The second excitation coil unit is realized, for example, by using the lower excitation coil 841 b.
The first magnetic flux density detection coil unit is realized, for example, by using the upper magnetic flux density detection coil 842a.
The second magnetic flux density detection coil unit is realized, for example, by using the lower magnetic flux density detection coil 842b.
The stress applying means is realized, for example, by using stress applying devices 1001 and 1002.

  100, 600, 800: tester body, 111: upper anvil, 112: lower anvil, 121 to 126: tightening member, 131, 831: upper winding frame, 132, 832: lower winding frame, 141, 841: Excitation coils 142, 642, 842: Magnetic flux density detection coils 151, 152, 161, 162, 851, 852: Insulating sheets 701a to 701c: Magnetic flux density detection coil sections 702a to 702c: Air gap compensation coil sections 841a: upper excitation coil, 841b: lower excitation coil, 842a: upper magnetic flux density detection coil, 842b: lower magnetic flux density detection coil, 861a, 861b, 862a, 862b, 863a, 863b, 864a, 864b: electrode, 1001, 1002: Stress application device

Claims (9)

A single-plate magnetic characteristic tester which measures magnetic characteristics of a test piece using one magnetic plate as a test piece,
An excitation coil which is wound around the test piece and for exciting the test piece;
A magnetic flux density detection coil wound around the test piece and detecting a magnetic flux density inside the excited test piece;
A first winding frame disposed at a position opposite to one of the plate surfaces of the test piece, in which a portion of the excitation coil and the magnetic flux density detection coil located on one side of the plate surface of the test piece is disposed; ,
A second winding frame disposed at a position facing the other of the plate surface of the test piece, in which a portion of the excitation coil and the magnetic flux density detection coil on the other side of the plate surface of the test piece is disposed ,
At least one of the first winding frame and the second winding frame is in a state where the first winding frame and the second winding frame are in contact with the test piece directly or through a member. The single-plate magnetic characteristic tester according to claim 1, wherein the single-plate magnetic characteristic tester moves in the thickness direction of the test piece.   The single-plate magnetic characteristic tester according to claim 1, wherein the electric wire constituting the excitation coil and the electric wire constituting the magnetic flux density detection coil are flexible.   The single-plate magnetic characteristic tester according to claim 2, wherein the electric wire constituting the excitation coil and the electric wire constituting the magnetic flux density detection coil are covered with a flexible insulating coating. The excitation coil has a first excitation coil portion which is one portion when divided in half along the coil axis, and a second excitation coil portion which is the other portion.
The first excitation coil unit is attached to the first winding frame,
The second excitation coil unit is attached to the second winding frame,
An electrode is formed in a region of the first excitation coil portion corresponding to the separation portion of the excitation coil,
An electrode is formed in a region of the second excitation coil portion corresponding to the separation portion of the excitation coil,
The first excitation coil portion is formed such that the excitation coil is configured when the first winding frame and the second winding frame are in contact with the test piece directly or through a member. The connected electrodes are electrically connected to the electrodes formed on the second excitation coil portion,
The magnetic flux density detection coil has a first magnetic flux density detection coil portion which is one portion when divided in half along the coil axis, and a second magnetic flux density detection coil portion which is the other portion.
The first magnetic flux density detection coil unit is attached to the first winding frame,
The second magnetic flux density detection coil unit is attached to the second winding frame,
An electrode is formed in a region of the first magnetic flux density detection coil portion corresponding to the separation portion of the magnetic flux density detection coil,
An electrode is formed in a region of the second magnetic flux density detection coil portion corresponding to the separation portion of the magnetic flux density detection coil,
The first magnetic flux density detection so that the magnetic flux density detection coil is configured when the first winding frame and the second winding frame are in contact with the test piece directly or via a member The single plate according to any one of claims 1 to 3, wherein an electrode formed in a coil portion and an electrode formed in the second magnetic flux density detection coil portion are electrically connected. Magnetic property tester. The magnetic flux density detection coil has a plurality of sets of a magnetic flux density detection coil portion and an air gap compensation coil portion as one set, and has a plurality of the sets.
The magnetic flux density detection coil unit has a loop with one or more turns.
The air gap compensation coil unit has a loop with one or more turns.
The test piece is placed inside the loop that constitutes the magnetic flux density detection coil unit,
When the current flows through the magnetic flux density detection coil, the magnetic flux density detection coil section and the air gap compensation coil section in the same group are the magnetic flux generated from the magnetic flux density detection coil section and the air gap compensation Connected to each other so that the magnetic flux generated by the
In the plurality of sets, when current flows in the magnetic flux density detection coil, magnetic fluxes generated from all of the magnetic flux density detection coil portions reinforce each other, and are generated from all the air gap compensation coil portions Are mutually connected so that the magnetic fluxes
When viewed along the direction of the axis of the loop constituting the magnetic flux density detection coil portion and the air gap compensation coil portion, the loop constituting the air gap compensation coil portion is the magnetic flux density detection coil The single-plate magnetic characteristic tester according to any one of claims 1 to 4, wherein the single-layered magnetic characteristic tester does not overlap at least a region where the test piece is placed in the loop constituting the part.   The single-plate magnetic characteristic tester according to claim 5, wherein all of the magnetic flux density detection coil portion and all of the air gap compensation coil portion are integrated.   The air gap compensation coil section is disposed on both sides of the same magnetic flux density detection coil section in a direction parallel to the excitation direction of the test piece in the same set. Single-plate magnetic property tester as described.   When viewed along the direction of the axis of the loop forming the magnetic flux density detection coil portion and the air gap compensation coil portion, the loop forming the magnetic flux density detection coil portion; and the air gap compensation coil The single-plate magnetic characteristic tester according to any one of claims 5 to 7, wherein the entire area with the loop forming the part does not overlap. The single-plate magnetic characteristic tester according to any one of claims 1 to 8,
Stress applying means for applying a stress to the test piece in the excitation direction of the test piece;
A single-plate magnetic characteristic test system characterized in that magnetic characteristics of the test piece are measured by the single-plate magnetic characteristic tester in a state where stress is applied in the excitation direction of the test piece by the stress application means. .

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