JP6897470B2 - Single plate magnetic property tester and single plate magnetic property test system - Google Patents

Description

The present invention relates to a veneer magnetic property tester and a veneer magnetic property test system, and is particularly suitable for use in measuring the magnetic properties of a soft magnetic material such as an electromagnetic steel plate.

A veneer tester is used to measure the magnetic properties of soft magnetic materials such as electrical steel sheets. The veneer tester is also referred to as a veneer magnetic property tester, a veneer magnetic tester, or the like. Hereinafter, the veneer tester will be referred to as a veneer magnetic property tester. In Non-Patent Document 1, the winding frame of the veneer magnetic property tester has a shape of a hollow rectangular parallelepiped penetrating in the longitudinal direction, and the length depends on the size of the veneer magnetic property tester and the like. The winding frame, which is the specified length, is described. The winding frame is also referred to as a winding frame or the like. In the following description, the winding frame will be 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 the winding frame. The primary coil is also referred to as an exciting coil or the like. In the following description, the primary coil will be referred to as an exciting 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 will be referred to as a magnetic flux density detection coil.

In the single plate magnetic property tester, a single plate test piece (one plate of soft magnetic material) is placed in the hollow part of the winding frame, and a closed magnetic path is formed by the test piece and the yoke. .. Then, the magnetic flux density generated in the test piece by passing an exciting current through the exciting coil to excite the test piece is obtained based on the induced electromotive force induced in the magnetic flux density detection coil. In the following description, a plate made of a soft magnetic material will be referred to as a soft magnetic plate, if necessary.

Japanese Unexamined Patent Publication No. 2012-141203

JIS C 2556: 2015 "Measuring method of magnetic properties of electrical steel strips with a veneer tester"

By the way, when the winding operation of winding the coil around the wound iron core is performed, the soft magnetic plate bent at a certain curvature is forcibly made flat. Further, since the stacked iron core is formed by stacking soft magnetic material plates, the non-flat soft magnetic material plates are forcibly made flat. It is required to measure the magnetic characteristics of the soft magnetic plate when the non-flat soft magnetic plate is forcibly made flat. When the soft magnetic plate is forcibly flattened, strain is introduced into the soft magnetic plate, and it is possible to evaluate how this strain 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 in a state where the uneven test piece is corrected to a flat state. However, in the technique described in Non-Patent Document 1, since the dimensions of the winding frame are determined, it is not easy to correct an uneven test piece into a flat state.

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. Further, 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 flattened. Therefore, it is not easy to apply uniform pressure to the entire test piece.

Further, it is conceivable that the shape of the test piece is deformed by arranging the bag in the hollow portion of the winding frame (between the inner wall surface of the winding frame and the test piece) and injecting air into the bag. However, even in this case, a large stress is applied to the winding frame, and the winding frame must be configured to withstand this pressure. Further, since the pressure of the test piece is applied by injecting air into the bag, it is not easy to apply a uniform pressure to the entire test piece.
As described above, the technique described in Non-Patent Document 1 has a problem that it is not easy to measure the magnetic characteristics of a test piece having an uneven shape in a flat state.

Further, in the single plate magnetic property tester, the magnetic property when the test piece is excited as described above with the compressive stress applied to the test piece is also measured. Patent Document 1 describes a technique of applying compressive stress in the exciting direction to a test piece in a state where the test piece is curved around the exciting direction of the test piece. According to Patent Document 1, by doing so, it is possible to suppress buckling of the test piece even if a compressive stress in the excitation direction is applied to the test piece.

However, in the technique described in Patent Document 1, the test piece is curved. Therefore, stress due to this curvature is introduced into the test piece. Therefore, there is a problem that the magnetic characteristics of the test piece cannot be measured in a state where stresses other than the compressive stress applied in the excitation direction are excluded.
As described above, the conventional single-plate magnetic property tester has a problem that the magnetic property of the test piece in a state where an external force is applied cannot be accurately measured.

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

The single-plate magnetic property tester of the present invention is a single-plate magnetic property tester that measures the magnetic characteristics of the test piece using one magnetic material plate as a test piece, and is wound around the test piece. , An exciting coil for exciting the test piece, a magnetic flux density detection coil for detecting the magnetic flux density inside the excited test piece, which is wound around the test piece, and the test piece. The first winding frame, which is arranged at a position facing one of the plate surfaces of the test piece, and the portion of the exciting coil and the magnetic flux density detection coil on one side of the plate surface of the test piece is arranged, and the test. A second winding frame arranged at a position facing the other of one plate surface, and 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 arranged, and the said. 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 via a member. In addition, it is characterized in that it moves in the thickness direction of the test piece.
The single-plate magnetic property test system of the present invention includes the single-plate magnetic property tester and stress-applying means for applying stress to the test piece in the excitation direction of the test piece, and the stress-applying means. The magnetic characteristics of the test piece are measured by the single-plate magnetic property tester in a state where stress is applied in the excitation direction of the test piece.

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

FIG. 1 is a perspective view showing a first embodiment and showing an example of a schematic configuration of a veneer magnetic property tester. FIG. 2 shows the first embodiment, and is a view of a veneer magnetic property tester viewed along the lateral direction of the test piece. FIG. 3 shows a first embodiment, and is a diagram 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 at the center in the longitudinal direction of the tester main body. FIG. 4 shows a first embodiment, and is a diagram showing an example of a cross section of the tester main body when cut in a direction perpendicular to the short side of the tester main body at the center in the lateral direction of the tester main body. is there. FIG. 5 is a diagram showing a first embodiment and explaining an example of how to wind the exciting coil and the magnetic flux density detecting coil. FIG. 6 shows a second embodiment, and is a diagram 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 at the center in the longitudinal direction of the tester main body. FIG. 7 is a diagram showing a second embodiment and explaining an example of how to wind the magnetic flux density detection coil. FIG. 8 shows a third embodiment, and is a diagram 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 at the center in the longitudinal direction of the tester main body. FIG. 9 shows a third embodiment, and is a view of the upper exciting coil and the lower exciting coil viewed along the thickness direction of the test piece. FIG. 10 shows a fourth embodiment and is a diagram showing an example of the configuration of a single plate magnetic property test system.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In each figure, the configuration is simplified or omitted as necessary for the convenience of explanation and notation. Further, in each figure, the X-axis, Y-axis, and Z-axis indicate the relationship of the orientations of each figure, and those marked with ● in ○ are directed from the back side to the front side of the paper. The direction is indicated, and the one with a cross in the circle indicates the direction from the front side to the back side of the paper.

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

In FIGS. 1A to 1D, the veneer magnetic property tester has a tester main body 100 and yoke yokes Y, Y1, and Y2. As shown in FIGS. 1 (a) to 1 (d), a closed magnetic path is formed by a single plate test piece S and yokes Y, Y1 and 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 property tester shown in FIGS. 1 (a) to 1 (d). And can be applied to any veneer tester. The test piece S is a single plate (one plate) having a rectangular planar shape, and is constructed by using a soft magnetic material such as a grain-oriented electrical steel sheet or a non-oriented electrical steel sheet. It is assumed that the test piece S is arranged so that its longitudinal direction is the X-axis direction, its lateral 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 this embodiment, the single-plate magnetic property tester of the vertical double yoke shown in FIG. 1B will be described as an example.
FIG. 2 is a view (a view taken along the Y-axis direction) of the veneer magnetic property tester of the vertical double yoke shown in FIG. 1 (b) along the lateral direction of the test piece S. FIG. 3 shows an example of a cross section of the tester main body 100 when cut in a direction perpendicular to the longitudinal direction (X-axis direction) of the tester main body 100 at the center of the tester main body 100 in the longitudinal direction (X-axis direction). It is a figure (cross-sectional view when cut in the portion shown by I-I of FIG. 2). FIG. 4 is a diagram showing an example of a cross section of the tester main body 100 when the tester main body 100 is cut in a direction perpendicular to the short side direction at the center of the tester main body 100 in the lateral direction (Y-axis direction). It is a cross-sectional view (cross-sectional view) when cut at the portion shown by II-II of FIG.

In FIGS. 1 to 4, the tester main 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 exciting coil 141, and a magnetic flux density detection coil 142. It has insulating sheets 151, 152, 161 and 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 lateral 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 non-magnetic material. Further, 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 will be described later. The upper anvil 111 and the lower anvil 112 are constructed using, 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 lateral direction (Y-axis direction) are positioned inside by a predetermined distance from the end in the lateral direction, and are mutually in the lateral direction. Through holes are formed so as to face each other in the height direction (Z-axis direction). As will be described later, a bolt, which is one of the tightening members 121 to 126, is passed through the through hole. As shown in FIG. 1, in the present embodiment, a case where three sets are formed in such through holes along the longitudinal direction (X-axis direction) of the upper anvil 111 and the lower anvil 112 is taken as an example. (The number of through holes is 6 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 positions facing each other in the height direction (Z-axis direction).

In FIGS. 1 to 3, the tightening members 121 to 126 have bolts and nuts. The bolt is a through hole formed in the upper anvil 111 and the lower anvil 112, and is inserted into the through hole facing each other 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 located at positions facing each other in the height direction (Z-axis direction) of the upper anvil 111 and the lower anvil 112. Bolts and nuts are attached to each of these sets of through holes.

By fixing one of the bolt and nut and tightening the other, the distance between the head of the bolt and the nut is narrowed. Also, by loosening the other, the distance between the head of the bolt and the nut is widened. In this way, 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 also include washers, bushes, and the like in addition to bolts and nuts. The bush has an insulating property and insulates between the bolts of the tightening 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 sandwiched between them. The lower winding frame 132 is attached to the surface of the lower anvil 112 facing the upper anvil 111 with an insulating sheet 162 sandwiched between them. 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 lateral 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 non-magnetic and insulating material. Further, the upper winding frame 131 and the lower winding frame 132 have a strength that does not deform when pressed from above and below using the upper anvil 111, the lower anvil 112, and the tightening members 121 to 126, as will be described later. The upper winding frame 131 and the lower winding frame 132 are constructed by 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 in the first recess. As shown in FIG. 5, the exciting coil 141 is spirally wound so that its 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. Is composed of. 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 match the shape of the exciting coil 141. The insulating sheets 161 and 162 protect the exciting coil 141 and secure the insulation between the upper anvil 111 and the lower anvil 112, so that the lower anvil 112 and the lower winding are between the upper anvil 111 and the upper winding frame 131. It is arranged 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). The 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 spirally winding its coil shaft so as to be parallel to the longitudinal direction (X-axis direction) and the 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 match the shape of the magnetic flux density detection coil 142. The insulating sheets 151 and 152 are surfaces of the upper winding frame 131 facing the lower winding frame 132 (test piece S) in order to protect the magnetic flux density detection coil 142 and ensure insulation from the test piece S. , The lower winding frame 132 is arranged on the surface facing the upper winding frame 131 (test piece S), respectively.

The exciting coil 141 is a coil arranged 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 arranged so as to surround the test piece S, and is a coil for detecting the magnetic flux density inside the excited test piece S. The magnetic flux density inside the test piece S can be obtained from the induced electromotive force induced at both ends of the magnetic flux density detection coil 142. As shown in FIGS. 2 to 4, the exciting coil 141 is arranged outside the magnetic flux density detection coil 142.

The coil shafts of the exciting 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 arranged in a region where the magnetic flux generated from the exciting coil 141 is large and uniform. Further, it is preferable that the coil axis of the exciting coil 141 and the axis of the test piece S (a virtual line passing through the center of the test piece S and extending in the longitudinal direction (X axis)) substantially coincide with each other, and more so. preferable. This is because the test piece S can be arranged in a region where the magnetic flux generated from the exciting coil 141 is large and uniform.

Further, in the present embodiment, a stranded electric wire is used as the electric wire constituting the exciting coil 141 and the magnetic flux density detection coil 142. Further, the exciting coil 141 and the magnetic flux density detection coil 142 are preferably stranded electric wires having a flexible insulating coating such as a Teflon (registered trademark) coated electric wire. This is because the electric wire can be protected and the insulation of the electric wire can be secured more reliably. When a stranded electric wire having an insulating coating is used as the exciting coil 141 and the magnetic flux density detecting coil 142, the insulating sheets 151, 152, 161 and 162 may not be used. In this case, for example, a stranded electric wire having an insulating coating is fixed to the first recess and the second recess by using an adhesive or the like.

Next, an example of how to use the tester main body 100 of this embodiment will be described. FIG. 3A is a diagram showing a state of the tester main body 100 at the time of test preparation. FIG. 3B is a diagram showing a state of the tester main body 100 at the time of the test.
As shown in FIG. 3A, before starting the test, the bolts of the tightening members 121 to 126 are loosened, and the test piece S is formed in the space formed between the upper winding frame 131 and the lower winding frame 132. To place. When the test piece S is arranged 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 (insulating sheet 151) and the lower winding frame 132 (insulating 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 increased. Reduce. For example, the bolts of the tightening members 121 to 126 are tightened until the length of the interval between the upper winding frame 131 (insulating sheet 151) and the lower winding frame 132 (insulating sheet 152) reaches a predetermined length. .. The predetermined length includes the plate thickness of the test piece S, the heights of the upper winding frame 131 and the lower winding frame 132 (the length in the Z-axis direction), and the thicknesses of the insulating sheets 151, 152, 161 and 162. Can be determined based on the sum of. That is, until the length of the distance between the upper winding frame 131 (insulating sheet 151) and the lower winding frame 132 (insulating sheet 152) becomes a length that can be regarded as a flat state of the test piece S. Tighten the bolts of the tightening members 121-126. In this way, the upper winding frame 131 (insulating sheet 151) and the lower winding frame 132 (insulating sheet 152) are brought into contact with (preferably close to) the test piece S, and then an exciting current is passed through the exciting coil 141 for the test. The magnetic characteristics of the piece S are measured.

When the distance between the upper winding frame 131 (insulating sheet 151) and the lower winding frame 132 (insulating sheet 152) is reduced as described above, the exciting coil 141 and the magnetic flux density detecting coil 142 are deformed. Therefore, as described above, in the present embodiment, the exciting coil 141 and the magnetic flux density detecting coil 142 are configured by using stranded electric wires so that the exciting coil 141 and the magnetic flux density detecting coil 142 have flexibility. Further, in FIG. 3B, of the exciting coil 141 and the magnetic flux density detection coil 142, the portions that are not inserted in the first recess and the second recess formed in the upper winding frame 131 and the lower winding frame 132. However, they may approach each other. Then, if the electric wires constituting the exciting coil 141 and the magnetic flux density detecting coil 142 are not insulated, the insulation of the exciting coil 141 and the magnetic flux density detecting coil 142 may not be maintained. Further, when the electric wires constituting the exciting coil 141 and the magnetic flux density detection coil 142 are not insulated and the bolts of the tightening members 121 to 126 are not insulated by an insulating bush or the like, the exciting coil 141 and There is a risk that the insulation between the magnetic flux density detection coil 142 and the tightening members 121 to 126 cannot be maintained. Therefore, it is preferable that the exciting coil 141 and the magnetic flux density detecting coil 142 are configured by using a stranded electric wire having a flexible insulating coating.

In the present embodiment, in the above operation, the positions of the lower anvil 112 and the lower winding frame 132 in the height direction (Z-axis direction) are fixed, and the heights of the upper anvil 111 and the upper winding frame 131 are fixed. It shall move in the direction (Z-axis direction). However, contrary to this, the height direction (Z-axis direction) positions of the upper anvil 111 and the upper winding frame 131 are fixed, and the lower anvil 112 and the lower winding frame 132 are in the height direction (Z-axis direction). ), Or both the upper anvil 111 and the upper winding frame 131 and the lower anvil 112 and the lower winding frame 132 may move in the height direction (Z-axis direction). Further, the upper anvil 111 and the lower anvil 112 are moved in the height direction (Z-axis direction) by using an electric device, a hydraulic device, or a pneumatic device 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 with (preferably in close contact with) the test piece S. Therefore, the test piece S can be flattened by applying as uniform pressure as possible to the entire test piece S without inserting a flat plate, an air bag, or the like in the hollow portion of the winding frame. Therefore, from the results of the measurement of the magnetic characteristics using the single-plate magnetic characteristics tester of the present embodiment, it is possible to accurately understand how, for example, flattening the uneven test piece S contributes to the magnetic characteristics. Can be grasped.

(Second embodiment)
Next, the second embodiment will be described. In the single plate magnetic property tester, the induced electromotive force based on the magnetic flux generated in the voids surrounding the magnetic flux density detection coil is removed from the induced electromotive force generated in the magnetic flux density detection coil (in the following description, this is the case). Is called void compensation). Non-Patent Document 1 describes that void compensation is performed by a mutual inducer, but in the present embodiment, a case where the magnetic flux density detection coil itself has a void compensation function 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, detailed description of the same parts as those of the first embodiment will be omitted by adding the same reference numerals as those given in FIGS. 1 to 5.

FIG. 6 shows an example of a cross section of the tester main body 600 when cut in a direction perpendicular to the longitudinal direction (X-axis direction) of the tester main body 600 at the center of the tester main body 600 in the longitudinal direction (X-axis direction). It is a figure which shows. Specifically, FIG. 6A is a diagram showing a state of the tester main body 600 at the time of test preparation. FIG. 6B is a diagram showing a state of the tester main body 600 at the time of the test. Note that FIG. 6 corresponds to a cross-sectional view when the portion shown by II in FIG. 2 is cut.
The tester main body 600 of the present embodiment has the magnetic flux density detection coil 642 shown in FIG. 6 instead 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 void compensation coil provided in the mutual inducer or the like 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 an exciting current is passed through the exciting coil without the test piece S, it is sufficient to prevent the induced electromotive force from being generated in the magnetic flux density detection coil. For that purpose, the present inventors form a plurality of loops in each cycle when a metal body such as a copper wire is periodically wound in order to form a magnetic flux density detection coil, and when there is no test piece, the present inventors form a plurality of loops. It was found that the plurality of loops should be formed so that the magnetic flux generated by the current flowing through the plurality of loops is canceled. The induced electromotive force induced in the magnetic flux density detection coil when the test piece is excited by passing an exciting current through the exciting coil with the test piece arranged inside any one of the plurality of loops formed in this way. This is because, if measured, the measured induced electromotive force does not include the magnetic flux flowing through the voids, but only the magnetic flux flowing through the test piece.

The magnetic flux density detection coil 642 is configured based on the above-mentioned new findings of the present inventors. FIG. 7 is a diagram illustrating an example of how to wind the magnetic flux density detection coil 642.
In FIG. 7, the magnetic flux density detection coil 642 has a plurality of magnetic flux density detection coil portions 701a to 701c each having a loop having a number of turns of "1" or more, and a plurality of loops having a number of turns of "1" or more, respectively. It has void compensation coil portions 702a to 702c.

In the following description, each of the plurality of magnetic flux density detection coil portions 701a to 701c will be referred to as a magnetic flux density detection coil portion 701, and each of the plurality of void compensation coil portions 702a to 702c will be referred to as a magnetic flux density detection coil portion 701. If necessary, the coil portion 702 for void compensation is referred to. Further, in the following description, a virtual line passing through the center of the loop constituting the magnetic flux density detection coil portion 701 and the void compensation coil portion 702 will be referred to as a coil portion shaft, if necessary. In FIG. 7, the shaft of the magnetic flux density detection coil portion 701 is the shaft 711, and the shafts of the void compensation coil portion 702 are the shafts 712a and 712b, respectively.

For convenience of notation and description, FIG. 7 shows the loops constituting the void compensation coil portions 702a to 702c larger than those of the void compensation coil portion 702 shown in FIG. Further, in FIG. 7, for convenience of notation and description, a case where the number of the magnetic flux density detection coil portion 701 and the number of the void compensation coil portions 702 are three is shown as an example. However, the number of the magnetic flux density detection coil portions 701 and the number of the void compensation coil portions 702 are not limited to "3".

In FIG. 7, the first end portion 721 of the magnetic flux density detection coil portion 701 and the first end portion 731 of the void compensation coil portion 702, the second end portion 722 of the magnetic flux density detection coil portion 701, and the void compensation coil are shown. The second end portion 732 of the portion 702 is connected to each other so that the magnetic flux density detection coil portion 701 and the void compensation coil portion 702 have opposite polarities.

Further, the third end portion 723 of the magnetic flux density detection coil portion 701 and the third end portion 733 of the void compensation coil portion 702, the fourth end portion 724 of the magnetic flux density detection coil portion 701, and the void compensation coil portion 702. The fourth end portion 734 of the above is connected to each other so that the magnetic flux density detection coil portion 701 and the void compensation coil portion 702 have opposite polarities.

That is, when a current flows through the magnetic flux density detection coil 642, the direction of the magnetic flux generated from the magnetic flux density detection coil portion 701 and the direction of the magnetic flux generated from the void compensation coil portion 702 are opposite to each other. (That is, the magnetic flux density detection coil portion 701 and the void compensation coil portion 702 are connected to each other so that the magnetic fluxes tend to weaken each other). In the example shown in FIG. 7, when a current flows as shown by an arrow (鏃) attached on the magnetic flux density detection coil 642 (magnetic flux density detection coil portion 701 and void compensation coil portion 702), the magnetic flux density is detected. The magnetic flux flows in the direction of the arrow line attached so as to penetrate the inside of the coil portion 701 and the coil portion 702 for void compensation.

The set of the magnetic flux density detection coil section 701 and the void compensation coil section 702 as described above is set as one set, and a plurality of sets are connected in series with each other so as to have forward polarity. That is, when a current flows through the magnetic flux density detection coil 642, the directions of the magnetic fluxes generated from the magnetic flux density detection coil portions 701 of each set are the same (that is, the directions in which these magnetic fluxes strengthen each other). ), Each set is connected in series so that the directions of the magnetic fluxes generated from the void compensation coil portion 702 of each set are the same.

Then, when connecting the sets of the magnetic flux density detection coil section 701 and the void compensation coil section 702 in series, the number of turns of the loop constituting the magnetic flux density detection coil section 701 is set to "1" in each set. The number of turns of the loop constituting the void compensation coil portion 702 is set to "2".

Further, the shaft 711 of the magnetic flux density detection coil portion 701 and the shafts 712a and 712b of the void compensation coil portion 702 are mutually excited in the excitation direction of the test piece S (the lateral direction (Y-axis direction) of the test piece S). Make it parallel at a distance. As shown in FIG. 7, the loops constituting the magnetic flux density detection coil portion 701 and the loops constituting the void compensation coil portion 702 are viewed along the directions (X-axis direction) of the axes 711, 712a, and 712b. In such a case (that is, in a plane perpendicular to the axes 711, 712a, 712b (YZ plane)), at least the regions where the test pieces S are placed should not overlap, and all the regions should not overlap. Is preferable.

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 portion 745 of the void compensation coil portion 702a in the set of the magnetic flux density detection coil portion 701a and the void compensation coil portion 702a. Then, in the set of the sixth end portion 746 of the void compensation coil portion 702a in the set of the magnetic flux density detection coil portion 701a and the void compensation coil portion 702a, and the set of the magnetic flux density detection coil portion 701b and the void compensation coil portion 702b. The fifth end portion 755 of the void compensation coil portion 702b is connected to each other. Similarly, a set of the sixth end portion 756 of the void compensation coil portion 702b in the set of the magnetic flux density detection coil portion 701b and the void compensation coil portion 702b, and the set of the magnetic flux density detection coil portion 701c and the void compensation coil portion 702c. The fifth end portion 765 of the void compensation coil portion 702c in the above is connected to each other. Then, the winding ends at the sixth end portion 766 of the void compensation coil portion 702c in the set of the magnetic flux density detection coil portion 701c and the void compensation coil portion 702c.

In the present embodiment, as the electric wire constituting the magnetic flux density detection coil 642, a stranded electric wire is used as in the magnetic flux density detection coil 142 of the first embodiment. Further, the magnetic flux density detection coil 642 is preferably a stranded electric wire having a flexible insulating coating such as a Teflon-coated electric wire. In this way, the magnetic flux density detection coil 642 is configured to be integrated by using a set of stranded electric wires. Therefore, in the description of FIG. 7, the magnetic flux density detection coil portion 701 and the void compensation coil portion 702, which are separated from each other, are not connected. Further, in FIG. 7, for convenience of notation, a part of the portion (the above-mentioned first end to sixth end) to which the magnetic flux density detection coil portion 701 and the void compensation coil portion 702 are connected is separated. As shown by, this part is connected. Further, as described above, the magnetic flux density detection coil portion 701 and the void compensation coil portion 702 form a loop that creates magnetic fluxes in opposite directions to each other. The position of the portion where the magnetic flux density detection coil portion 701 and the void compensation coil portion 702 are connected (the above-mentioned first end to sixth end) may be a position that can be the boundary of the loop, and is not necessarily specified. It will not be in one place.

Here, in the area of the loop forming the magnetic flux density detection coil portion 701, the loop having two turns forming the void compensation coil portion 702 (next to both sides of the loop forming the magnetic flux density detecting coil portion 701). It is preferable that the sum of the areas of the loops) is close to each other. The area of the loop is the area of the so-called coil surface, and is, for example, the area of the shape when the contour of the magnetic flux density detection coil portion 701 in FIG. 6 is approximated by a predetermined shape (for example, an ellipse or a rectangle). Can be the area of the loop constituting the magnetic flux density detection coil portion 701. This is the same for the void compensation coil portion 702.

By configuring the magnetic flux density detection coil portion 701 and the void compensation coil portion 702 as described above, in the absence of the test piece S, the magnetic flux density detection coil portion 701 and the void compensation coil portion are provided in each set. The magnetic flux generated by the current flowing through the 702 is canceled, and the induced electromotive force induced in the magnetic flux density detection coil 642 can be brought close to "0 (zero)". Therefore, the induced electromotive force induced in the magnetic flux density detection coil 642 with the test piece S arranged inside the magnetic flux density detection coil portion 701 becomes a void-compensated induced electromotive force, and the magnetic flux inside the test piece S. It is possible to approach the induced electromotive force based only on the change in density.

Here, the area of the loop that constitutes the magnetic flux density detection coil portion 701 and the loop that constitutes the void compensation coil portion 702 with two turns (they are on both sides of the loop that constitutes the magnetic flux density detection coil portion 701). If the sum of the areas of the loops) can be made equal to each other, the induced electromotive force induced in the magnetic flux density detection coil 642 becomes substantially “0 (zero)” (preferably “0 (zero)”). Therefore, the induced electromotive force induced in the magnetic flux density detection coil 642 with the test piece S arranged 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 piece S. become. Further, by increasing the number of windings of the loops constituting the void compensation coil portion 702 in each group, the area of the loop constituting the magnetic flux density detection coil portion 701 and the void compensation coil portion 702 are configured in each group. The induced electromotive force induced in the magnetic flux density detection coil 642 can be substantially "0 (zero)" (preferably "0 (zero)") even if the sum of the areas of the loops to be formed is equal.
Similar to Non-Patent Document 1, the total number of turns of the loop constituting the magnetic flux density detection coil portion 701 that functions as the magnetic flux density detection coil of the single plate magnetic characteristic tester is set according to the characteristics of the measuring device. It can be done, for example, 20 times or more. Further, in the same set, the number of turns of the loop constituting the magnetic flux density detection coil portion 701 may be 2 or more.

When a mutual inducer is used as in the technique described in Non-Patent Document 1, it is necessary to add a coil for performing void compensation. Due to the inductance of this additional coil, the phase of the induced electromotive force induced in the magnetic flux density detection coil may be delayed. Leakage of magnetic flux from this additional coil also causes the phase of the induced electromotive force induced in the magnetic flux density detection coil to shift. Further, the capacitance generated between the additional coil and the magnetic flux density detection coil also causes the phase of the induced electromotive force induced in the magnetic flux density detection coil to shift. In some cases, this capacitance may cause the circuit to resonate. Further, due to the presence of the additional coil, noise may 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 void compensation can be performed without using the mutual inducer, a coil different from the magnetic flux density detection coil is not required to perform the void compensation. Therefore, the phase of the induced electromotive force induced in the magnetic flux density detection coil 642 is shifted, noise is superimposed on the induced electromotive force induced in the magnetic flux density detection coil 642, or a circuit including the magnetic flux density detection coil 642 is installed. It is possible to suppress resonance.

(Third Embodiment)
Next, a third embodiment will be described. In the first embodiment and the second embodiment, a case where a stranded electric wire is used as an electric wire constituting the exciting 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) at a portion arranged in the upper winding frame and a portion arranged in the lower winding frame (assumed). An electrode is formed at the separation part of the case. Then, when the tester main body is used, the exciting coil and the magnetic flux density detection coil are configured when the distance between the upper winding frame and the lower winding frame is narrowed until the test piece S is in close contact. 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 exciting coil and the magnetic flux density detection coil are mainly different between the present embodiment and the first embodiment and the second embodiment. Therefore, in the description of the present embodiment, the same parts as those of the first embodiment and the second embodiment are designated by the same reference numerals as those shown in FIGS. 1 to 7, and detailed description thereof will be omitted. To do. Here, a 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 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). It is a figure which shows. Specifically, FIG. 8A is a diagram showing a state of the tester main body 800 at the time of test preparation. FIG. 8B is a diagram showing a state of the tester main body 800 at the time of the test. Note that FIG. 8 is a diagram corresponding to FIG. Note that FIG. 8 corresponds to a cross-sectional view when the portion shown by II in FIG. 2 is cut.

The tester main body 800 of the present embodiment has an upper winding frame 831 and a lower winding instead of the upper winding frame 131, the lower winding frame 132, the exciting coil 141, the magnetic flux density detection coil 142, and the insulating sheets 151 and 152. It has a frame 832, an exciting coil 841, a magnetic flux density detection coil 842, and insulating sheets 851 and 852. Further, the tester main body 800 of the present embodiment does not have the insulating sheets 161 and 162 arranged between the upper winding frame 831 and the upper anvil 111. Although the tightening members 121 to 126 are not shown in FIG. 8 for convenience of notation, the tightening members 121 to 126 are the same as those described in the first embodiment. Further, 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 lateral 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 non-magnetic and insulating material. Further, the upper winding frame 831 and the lower winding frame 832 have a strength that does not deform when pressed from above and below 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 constructed by using, for example, a phenol resin or a glass epoxy resin.

In FIG. 8, a hole is formed in a region inside the upper winding frame 831 on the upper anvil 111 side in a direction substantially parallel to the plate surface (XY plane) of the test piece S. .. Further, a hole that reaches from this hole to the surface of the upper winding frame 831 facing the lower winding frame 832 (test piece S) in a direction substantially parallel to the thickness direction (Z-axis direction) of the test piece S. The part is formed. A hole is formed in a region inside the lower winding frame 832 on the lower anvil 112 side in a direction substantially parallel to the plate surface (XY plane) of the test piece S. Further, a hole that reaches from this hole to the surface of the lower winding frame 832 facing the upper winding frame 831 (test piece S) in a direction substantially parallel to the thickness direction (Z-axis direction) of the test piece S. The part is formed.

The upper exciting coil 841a is arranged in the hole formed in the upper winding frame 831. The lower exciting coil 841b is arranged in the hole formed in the lower winding frame 832. FIG. 9 is a view of the upper exciting coil 841a and the lower exciting coil 841b viewed along the thickness direction (Z-axis direction) of the test piece. In FIG. 9, the lower exciting coil 841b is shown by a broken line. In addition, FIG. 8 is a cross-sectional view when cut at the portion shown by III-III of FIG.

The exciting coil 841 spirally wound around the test piece S so that the coil shaft is substantially parallel to the longitudinal direction (X-axis direction) of the test piece S is separated (cut) in half along the coil shaft. ) Is the upper exciting coil 841a and the other is the lower exciting coil 841b. The shape, size, and position of the holes of the upper winding frame 831 and the lower winding frame 832 are determined so as to match the shapes of the upper exciting coil 841a and the lower exciting coil 841b.

In the upper winding frame 831 and the lower winding frame 832, the holes formed in the direction substantially parallel to the thickness direction (Z-axis direction) of the test piece S are the regions of the upper exciting coil 841a and the lower exciting coil 841b. Therefore, the test piece S is extended from the region corresponding to the separated portion (cut portion) of the exciting coil 841 in a direction substantially parallel to the thickness direction (Z-axis direction) of the test piece S. As described above, of the upper exciting coil 841a and the lower exciting 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 (Z-axis direction) of the test piece S. ) Is arranged in a hole formed in a direction substantially parallel to). On the other hand, the other parts of the upper exciting coil 841a and the lower exciting coil 841b are formed in the upper exciting coil 841a and the lower exciting coil 841b in a direction substantially parallel to the plate surface (XY plane) of the test piece S. It is placed in the hole. In FIG. 9, the portion shown by the solid line and the broken line is a portion arranged in the hole portion formed in a direction substantially parallel to the plate surface (XY plane) of the test piece S.

Electrodes 861a, 861b, 862a, 862b are arranged in the region of the upper exciting coil 841a and the lower exciting coil 841b, which corresponds to the separated portion of the exciting coil 841.
As shown in FIG. 8, protrusions on the electrodes 861a and 861b ensure that the electrodes 861a to 861b and 862a to 862b facing each other in the thickness direction (Z-axis direction) of the test piece S are electrically connected to each other. The part is formed. The protrusion is expanded and contracted as a spring, for example, and when no external force is applied, the height of the protrusion is higher than the maximum thickness assumed as the thickness of the test piece S. It is preferable that the thickness shrinks from the minimum value of the assumed 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). The upper magnetic flux density detection coil 842a is arranged in the recess formed in the upper winding frame 831. The lower magnetic flux density detection coil 842b is arranged in the recess formed in the lower winding frame 832. Inside the exciting coil 841, a magnetic flux density detection coil 842 is 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. One of those separated (cut) in half 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 recesses of the upper winding frame 831 and the lower winding frame 832 are determined so as to match the shapes of the upper magnetic flux density detecting coil 842a and the lower magnetic flux density detecting coil 842b.

Electrodes 863a, 863b, 864a, 864b are arranged in the region of the upper magnetic flux density detection coil 842a and the lower magnetic flux density detection coil 842b, which corresponds to the separated portion of the magnetic flux density detection coil 842. As shown in FIG. 9, the electrodes 863a and 863b have protrusions so that the electrodes 863a to 863b and 864a to 864b facing each other in the thickness direction (Z-axis direction) of the test piece S are reliably electrically connected. The part is formed. The protrusion is expanded and contracted as a spring, for example, and when no external force is applied, the height of the protrusion is higher than the maximum thickness assumed as the thickness of the test piece S. It is preferable that the thickness shrinks from the minimum value of the assumed thickness.
A view of the upper magnetic flux density detection coil 842a and the lower magnetic flux density detection coil 842b along the thickness direction (Z-axis direction) of the test piece S is shown in FIG. 9, 841a, 841b, 861a, 861b, 862a. 862b is 842a, 842b, 863a, 863b, 864a, 864b, respectively.

As described in the first embodiment, the coil shafts of the exciting coil 841 and the magnetic flux density detection coil 842 are preferably substantially coaxial, and more preferably coaxial. Further, it is preferable that the coil axes of the exciting coil 841 and the magnetic flux density detection coil 842 and the axis of the test piece S (a virtual line passing through the center of the test piece S and extending in the longitudinal direction (X axis) thereof) substantially coincide with each other. , 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 the insulation between the upper magnetic flux density detection coil 842a and the lower magnetic flux density detection coil 842b and the test piece S, respectively. Is for. However, the insulating sheets 851 and 852 are not arranged in the regions of the electrodes 863a, 863b, 864a, and 864b. That is, the insulating sheet 851 (852) is at least an electrode 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). It is arranged in the region excluding 863a and 863b (864a, 864b).

The method of using the tester main body 800 of the present embodiment is the same as that of the tester main body 100 of the first embodiment.
That is, as shown in FIG. 8A, before starting the test, the bolts of the tightening members 121 to 126 are loosened, and the test is performed in the space formed between the upper winding frame 831 and the lower winding frame 832. Place one piece S. When the test piece S is arranged 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 (insulating sheet 851) and the lower winding frame 832 (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 increased. Reduce. For example, tighten the bolts of the tightening members 121 to 126 until the length of the interval between the upper winding frame 831 (insulating sheet 851) and the lower winding frame 832 (insulating sheet 852) reaches a predetermined length. .. The predetermined length can be determined based on the plate thickness of the test piece S. That is, until the length of the distance between the upper winding frame 831 (insulating sheet 851) and the lower winding frame 832 (insulating sheet 852) becomes a length that can be regarded as a flat state of the test piece S. 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 that face each other in the thickness direction (Z-axis direction) of the test piece S are electrically connected to form the exciting coil 841 and the magnetic flux density. The detection coil 842 is formed. In this way, the upper winding frame 831 (insulating sheet 851) and the lower winding frame 832 (insulating sheet 852) are brought into contact with (preferably close to) the test piece S, and then an exciting current is passed through the exciting coil 841 for the test. The magnetic characteristics of the piece S are measured.

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

As described above, in the present embodiment, one of the exciting coil 841 and the magnetic flux density detection coil 842 separated in half along the coil axis is arranged in the upper winding frame 831 and the other in the lower winding frame 832. , Electrodes 861a, 861b, 862a, 862b, 863a, 863b, 864a, 864b are provided in the region corresponding to the separated portion. Then, when the tester main body 800 is used and the distance between the upper winding frame 831 and the lower winding frame 832 is narrowed until the test piece S is in close contact, the exciting coil 841 and the magnetic flux density detection coil 842 are configured. The electrodes 861a, 861b, 863a, 863b arranged in the upper winding frame 831 and the electrodes 862a, 862b, 864a, 864b of the portion arranged in the lower winding frame 832 are electrically connected. .. Therefore, in addition to the effect described in the first embodiment, the effect that the magnetic flux density detection coil 842 does not need to have flexibility can be obtained. Further, since the magnetic flux density detection coil 842 can be brought close to the test piece S, the effect that the gap surrounded by the magnetic flux density detection coil 842 can be reduced can be obtained.

In the present embodiment, the winding method of the exciting coil 141 and the magnetic flux density detecting coil 142 of the first embodiment has been described as an example, but when the winding method of the magnetic flux density detecting coil 642 of the second embodiment is used, the winding method is used. Also, the method of the present embodiment can be applied. That is, in FIG. 7, a magnetic flux density detection coil having the same winding method as that of the magnetic flux density detection coil 642 is provided at the first end portion 721 of the magnetic flux density detection coil portion 701 and the first end portion of the void compensation coil portion 702. Between 731 and the second end 722 of the coil for detecting magnetic flux density 701 and the second end 732 of the coil for gap compensation 702, and for the third end 723 and gap compensation of the coil for detecting magnetic flux density 701. Between the third end 733 of the coil portion 702, the fourth end 724 of the magnetic flux density detection coil portion 701 and the fourth end 734 of the void compensation coil portion 702, and the sixth of the void compensation coil portion 702. Between the ends 746, 756 and the fifth ends 755, 765 of the void compensation coil portion 702, and opposite to the fifth ends 755, 765 and sixth ends 746, 756 of the void compensation coil portion 702. One is arranged in the upper winding frame and the other is arranged in the lower winding frame when separated (cut) by the folded portions 771 to 773, and electrodes are provided in the region corresponding to the separated portions. Then, when the distance between the upper winding frame and the lower winding frame is narrowed until the test piece S is in close contact, the electrode and the lower portion formed on the upper winding frame so that the magnetic flux density detection coil is formed. It is electrically connected to the electrode formed on the winding frame.

(Fourth Embodiment)
Next, a fourth embodiment will be described. In the present embodiment, the single plate described in the first to third embodiments is described 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). A case of measuring the magnetic characteristics of the test piece S using a magnetic characteristics tester will be described. As described above, in this embodiment, a configuration for applying stress to the test piece S is added to the single plate magnetic property tester described in the first to third embodiments. Therefore, in the description of the present embodiment, detailed description of the same configuration as that of the first to third embodiments will be omitted by adding the same reference numerals as those given in FIGS. 1 to 9. Here, the single-plate magnetic property tester described in the first embodiment will be described as an example.

FIG. 10 is a diagram showing an example of the configuration of a single plate magnetic property test system. In FIG. 10, the veneer magnetic property tester is a state in which the veneer magnetic property tester of the vertical double yoke shown in FIG. 1B is viewed along the lateral direction of the test piece S (along the Y-axis direction). (FIG. 10 is a diagram corresponding to FIG. 2). In FIG. 10, the single-plate magnetic property test system includes the single-plate magnetic property tester described in the first embodiment and the stress adding devices 1001 and 1002.

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

The stress applying devices 1001 and 1002 grip one end and the other end of the excitation direction (longitudinal direction and X-axis direction of the test piece S) in the test piece S, and the excitation direction (longitudinal length of the test piece S) with respect to the test piece S. It is a device that applies stress in the direction (direction, X-axis direction). The stress may be a compressive stress or a tensile stress, and the compressive stress alone may be applied, only the tensile stress may be applied, or the compressive stress and the tensile stress may be continuously applied. Further, the magnitude of stress may be constant or may change with the passage of time.

When the test piece S is applied in the exciting direction by the stress applying devices 1001 and 1002 as described above, the magnetic property of the test piece S is measured by the single plate magnetic property tester.
For example, since the stator core of a rotary electric 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 electromagnetic steel sheet constituting the stator core. By measuring the magnetic characteristics of the electromagnetic steel sheet to 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 property tester of the first embodiment, since 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, the stress applying device 1001 causes a large stress as described above. Is added, it is possible to prevent the test piece S from buckling. Further, unlike 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 in a state where stresses other than the compressive stress applied in the excitation direction are excluded. Can be measured. Therefore, when the soft magnetic plate is applied to an electric device, it is possible to accurately grasp the deterioration of the magnetic characteristics due to the stress that is expected to be applied to the soft magnetic plate.

In the present embodiment, the single-plate magnetic property tester of the first embodiment has been described as an example, but the single-plate magnetic property tester of the second to fourth embodiments has also been described with respect to the stress applying devices 1001 and 1002. Therefore, 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). Instead of using the stress applying device 1002, the other end of the test piece S in the longitudinal direction (X-axis direction) may be gripped to fix the test piece S.

The embodiments of the present invention described above are merely examples of embodiment of the present invention, and the technical scope of the present invention should not be construed 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 its main features.

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

100, 600, 800: Tester body, 111: Upper anvil, 112: Lower anvil, 121-126: Tightening member, 131, 831: Upper winding frame, 132, 832: Lower winding frame, 141, 841: Exciting coil, 142, 642, 842: Magnetic flux density detection coil, 151, 152, 161, 162, 851, 852: Insulation sheet, 701a to 701c: Magnetic flux density detection coil part, 702a to 702c: Void compensation coil part, 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 property tester that measures the magnetic characteristics of a single magnetic plate as a test piece.
An exciting coil that is wound around the test piece to excite the test piece, and
A magnetic flux density detection coil for detecting the magnetic flux density inside the test piece, which is wound around the test piece and excited.
A first winding frame arranged at a position facing one of the plate surfaces of the test piece, and a portion of the exciting coil and the magnetic flux density detection coil on one side of the plate surface of the test piece is arranged. ,
A second winding frame arranged at a position facing the other side of the plate surface of the test piece, and a portion of the exciting coil and the magnetic flux density detection coil on the other side of the plate surface of the test piece is arranged. ,
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 via a member. As described above, a single-plate magnetic property tester characterized in that the test piece moves in the thickness direction of the test piece. The single-plate magnetic property tester according to claim 1, wherein the electric wire constituting the exciting coil and the electric wire constituting the magnetic flux density detection coil are flexible. The single-plate magnetic property tester according to claim 2, wherein the electric wire constituting the exciting coil and the electric wire constituting the magnetic flux density detection coil are covered with a flexible insulating coating. The exciting coil has a first exciting coil portion which is one portion and a second exciting coil portion which is the other portion when separated in half along the coil shaft.
The first exciting coil portion is attached to the first winding frame and is attached to the first winding frame.
The second exciting coil portion is attached to the second winding frame and is attached to the second winding frame.
An electrode is formed in a region of the first exciting coil portion corresponding to the separated portion of the exciting coil.
An electrode is formed in a region of the second exciting coil portion corresponding to the separated portion of the exciting coil.
The first exciting coil portion is formed so that the exciting coil is formed when the first winding frame and the second winding frame are in contact with the test piece directly or via a member. The electrode formed in the second exciting coil portion and the electrode formed in the second exciting coil portion are electrically connected to each other.
The magnetic flux density detection coil has a first magnetic flux density detection coil portion, which is one portion when separated 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 portion is attached to the first winding frame and is attached to the first winding frame.
The second magnetic flux density detection coil portion is attached to the second winding frame and 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 the electrode formed in the coil portion and the 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 such sets as a set of a magnetic flux density detection coil portion and a void compensation coil portion.
The magnetic flux density detection coil portion has a loop having one or more turns.
The void compensation coil portion has a loop having one or more turns.
The test piece is placed inside the loop constituting the magnetic flux density detection coil portion.
The magnetic flux density detection coil portion and the void compensation coil portion in the same set are the magnetic flux generated from the magnetic flux density detection coil portion and the void compensation when a current flows through the magnetic flux density detection coil. They are connected to each other so that the magnetic flux generated from the coil section weakens each other.
In the plurality of sets, when a current flows through the magnetic flux density detection coil, the magnetic fluxes generated from all the magnetic flux density detection coil portions mutually strengthen each other, and are generated from all the void compensation coil portions. They are connected to each other so that the magnetic fluxes that they make strengthen each other.
When viewed along the direction of the axis of the loop constituting the magnetic flux density detecting coil portion and the void compensating coil portion, the loop constituting the void compensating coil portion is the magnetic flux density detecting coil. The single-plate magnetic property tester according to any one of claims 1 to 4, wherein the loop constituting the part does not overlap with at least a region where the test piece is placed. The single-plate magnetic property tester according to claim 5, wherein all of the magnetic flux density detection coil portion and all of the void compensation coil portion are integrated. According to claim 5 or 6, in the same set, the void compensation coil portion is arranged on both sides of the magnetic flux density detection coil portion in a direction parallel to the excitation direction in the test piece. The single plate magnetic property tester described. When viewed along the direction of the axis of the loop constituting the magnetic flux density detection coil portion and the void compensation coil portion, the loop constituting the magnetic flux density detection coil portion and the void compensation coil The single-plate magnetic characteristic tester according to any one of claims 5 to 7, wherein all the regions of the loop forming the portion do not overlap with each other. The veneer magnetic property tester according to any one of claims 1 to 8.
It has a stress applying means for applying stress to the test piece in the excitation direction of the test piece.
A single-plate magnetic property test system characterized in that the magnetic characteristics of the test piece are measured by the single-plate magnetic property tester in a state where stress is applied in the excitation direction of the test piece by the stress-applying means. ..

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