JP2019021721A - Three-phase transformer core - Google Patents

Abstract

To reduce noise due to vibration of a product iron core used for a three-phase transformer.SOLUTION: Slits 3410, 3420, 3510, and 3520 extending in the X-axis direction (rolling direction of a grain-oriented electrical steel sheet) are formed in the vicinity of the center of iron core blocks 3400 and 3500 constituting a yoke of the product iron core 3000 in the Y axis direction. This increases the magnetic resistance in the direction other than the rolling direction RD of the grain-oriented electrical steel sheet in a region in the vicinity of the center of the iron core blocks 3400 and 3500 in the Y axis direction and reduces the magnetic flux that flows in the direction other than the rolling direction RD of the grain oriented electrical steel sheet.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a steel core for a three-phase transformer, and is particularly suitable for use in a three-phase transformer.

  As an iron core used for a transformer, there is a laminated iron core formed by laminating electromagnetic steel sheets. When a grain-oriented electrical steel sheet is used as the iron core, the rolling direction of the grain-oriented electrical steel sheet, the extension (longitudinal) direction of the legs of the core and the extension (longitudinal) direction of the yoke (the extension direction of the legs and the lamination of the electrical steel sheets) The direction perpendicular to the direction). This is because the grain-oriented electrical steel sheet has a large magnetic anisotropy and has a high permeability in the rolling direction (permeability in other directions).

  As a product core of a transformer, there is a technique described in Patent Document 1. Patent Document 1 describes that a slit-like hole extending in a direction substantially orthogonal to a magnetic path formed when a transformer is excited is formed in an iron core.

Japanese Utility Model Publication No. 5-50713

  Incidentally, it is desired to reduce the vibration sound (so-called beat) of the iron core that is generated when the transformer is operating. However, the hole formed in the iron core in the technique described in Patent Document 1 causes a rapid increase in excitation current by locally saturating the iron core before the entire iron core reaches saturation (before the magnetic flux density reaches the saturation magnetic flux density). It is for relaxation. Therefore, it is not easy to reduce the noise of the iron core. In particular, in a three-phase transformer, the phase of the voltage of each phase is shifted by 120 °, so that the vibration sound of the iron core is likely to be generated, and the need for lower noise in the iron core is higher than in a single-phase transformer.

  This invention is made | formed in view of the above problems, and it aims at reducing the noise by the vibration of the iron core used for a three-phase transformer.

  The stacked iron core for a three-phase transformer of the present invention has a three-phase transformer core having a plurality of legs and a yoke that magnetically connects the two legs located adjacent to each other, and serves as a stacked core of the three-phase transformer. The transformer core, wherein the plurality of legs are spaced apart from each other, the extending directions of the plurality of legs are parallel to each other, and the legs and the yoke are each laminated in layers. The directionality of the directional electromagnetic steel sheet constituting the leg is the same as the direction of lamination of the directional electromagnetic steel sheet constituting the leg and the direction of lamination of the directional electromagnetic steel sheet constituting the yoke. The rolling direction of the electrical steel sheet is a first direction that is the extending direction of the legs, and the rolling direction of the grain-oriented electrical steel sheet that constitutes the yoke is the first direction that is the extending direction of the legs. And a direction perpendicular to the second direction which is the lamination direction of the grain-oriented electrical steel sheets. A magnetostriction reducing region including at least a region having a higher magnetoresistance in the first direction than the other regions of the yoke in a partial region of the yoke, and the magnetostriction reducing region The length in the third direction is longer than the length in the first direction of the magnetostriction reducing region.

  ADVANTAGE OF THE INVENTION According to this invention, the noise by the vibration of the iron core used for a three-phase transformer can be made small.

It is a figure which shows the general structure of a steel core. It is a figure which shows an example of the relationship between a magnetostriction and the angle from the rolling direction of an excitation direction. It is a figure which shows an example of a structure of the product core of 1st Embodiment. It is a figure explaining an example of the field which forms a slit. It is a figure which shows notionally an example of the magnetic flux line which arises in the product core of 1st Embodiment. It is a figure which shows an example of a structure of the product core of 2nd Embodiment. It is a figure which shows the modification of a structure of the product core of 1st, 2nd embodiment. It is a figure which shows an example of a structure of the product core of 3rd Embodiment. It is a figure which shows an example of the relationship between a maximum magnetic flux density and a magnetostriction. It is a figure which shows an example of a structure of the product core of 4th Embodiment. It is a figure which expands and shows the part of the iron core block of Fig.10 (a). It is a figure which shows an example of a structure of the product core of 5th Embodiment. It is a figure which expands and shows the part of the iron core block of Fig.12 (a). It is a figure which shows an example of a structure of the product core of 6th Embodiment. It is a figure which expands and shows the part of the iron core block of Fig.14 (a). It is a figure which shows the modification of an iron core block.

Before explaining the embodiment of the present invention, the background to the embodiment of the present invention will be described.
FIG. 1 is a diagram showing a general configuration of a steel core 1000 for a three-phase transformer. In the following description, the iron core for a three-phase transformer is abbreviated as a core iron as necessary. Fig.1 (a) shows the top view of a steel core, FIG.1 (b) shows the II sectional drawing (sectional drawing at the time of cutting along II) of Fig.1 (a). In each figure, the X-axis, Y-axis, and Z-axis are diagrams showing the relationship of the orientation of each figure. The circles marked with ● indicate the direction from the back to the front of the page, and those marked with a circle indicate the direction from the front to the back of the page. Show.

In FIG. 1A and FIG. 1B, the product core 1000 is configured by laminating a plurality of grain-oriented electrical steel sheets.
The iron core 1000 has iron core blocks 1100, 1200, 1300, 1400, and 1500.

  The iron core blocks 1100, 1200, and 1300 are parts constituting the legs of the product iron core 1000. The shape and size of the iron core blocks 1100 and 1300 are the same. The planar shape of the iron core blocks 1100 and 1300 is an isosceles trapezoid. The length of the upper or lower base of the isosceles trapezoid corresponds to the length of the legs of the stacked iron core 1000 in the Y-axis direction (the leg extending (longitudinal) direction). The iron core block 1200 is configured by laminating directional electrical steel sheets having a hexagonal shape in which a pair of sides facing each other is longer than the other set of sides in a planar shape. As shown in FIG. 1 (a), among the sides of this hexagon, the length of a pair of sides (two sides) longer than the other sides is equal, and the length of this side is the core block. It is equal to the length of the shorter side of the upper base and the lower base of the isosceles trapezoid having a planar shape of 1100, 1300. FIG. 1A shows an example in which the lengths of the other sides (four sides) are equal, but the lengths of the other sides (four sides) may not be equal.

  The iron core blocks 1400 and 1500 are parts that constitute a yoke of the stacked iron core 1000, and are for magnetically connecting the iron core blocks 1100, 1200, and 1300. The shapes and sizes of the iron core blocks 1400 and 1500 are the same. The iron core blocks 1400 and 1500 are laminated with directional electrical steel sheets having a planar shape in which the central part of the shorter side of the isosceles trapezoidal upper and lower bases is recessed. It is comprised by letting. The shape of the recessed portion is such that two short sides adjacent to each other of the hexagonal shape that is the planar shape of the iron core block 1200 overlap each other (one) end point and the two short sides apart from each other. It is a triangular shape having apexes at certain (two) end points. The length of the upper base or the lower base of the isosceles trapezoidal shape is the X-axis direction (longitudinal direction (leg extending direction (Y-axis direction) and stacking direction of directional electrical steel sheets (Z This corresponds to the length in the direction perpendicular to the axial direction.

  Here, the rolling direction (the direction of the easy axis of magnetization) is the direction of the double arrow line shown beside the RD in FIG. 1A, and the planar shape is each of the iron core blocks 1100, 1200, 1300, 1400, 1500. The directional electrical steel sheets constituting the respective iron core blocks 1100, 1200, 1300, 1400, and 1500 are obtained by shearing or punching the directional electrical steel sheets with a die so as to have the same planar shape. Each of the core blocks 1100, 1200, 1300, 1400, 1500 is obtained by laminating and fixing such directional electrical steel sheets so that their contours are matched. And the product core 1000 is obtained by combining each core block 1100, 1200, 1300, 1400, 1500 as shown to Fig.1 (a) and FIG.1 (b).

  The iron core 1000 is an inner iron type iron core. When a three-phase transformer is configured using the core iron 1000, a coil is arranged for each of the three legs (iron core blocks 1100, 1200, 1300) of the core iron 1000. The coil arrange | positioned at each leg respond | corresponds to the coil of each phase of a three-phase alternating current power supply, for example. In FIG. 1A, when an AC voltage of a three-phase AC power source is applied to a coil (not shown) arranged with respect to the iron core blocks 1100, 1200, and 1300, an excitation cycle (a frequency of the three-phase AC power source is set). An example of magnetic flux lines generated inside the product core 1000 at a certain temporary point (for example, when the amplitudes of the U-phase and V-phase voltages are equal and the polarities are equal) is shown conceptually.

  As shown to Fig.1 (a), a magnetic flux flows into directions other than the rolling direction (RD) of a grain-oriented electrical steel sheet in the area | regions 1600 and 1700. FIG. As described above, when the AC voltage of the three-phase AC power supply is applied, the center in the X-axis direction of the iron core block 1200 and the center in the X-axis direction of the iron core block 1300 in the region of the iron core blocks 1400 and 1500 (that is, the yoke). The magnetic flux flows in a direction other than the rolling direction of the grain-oriented electrical steel sheet.

  In addition, although illustration is abbreviate | omitted here, when the alternating voltage of a three-phase alternating current power supply is applied to the coil not shown arrange | positioned with respect to the iron core blocks 1100, 1200, and 1300, an excitation period (three-phase alternating current power supply The core of the core blocks 1400 and 1500 (that is, the yoke) at a certain point in time (period corresponding to frequency) (for example, when the amplitudes of the V-phase and W-phase voltages are equal and polarities are equal). In a region between the center of the block 1100 in the X-axis direction and the center of the iron core block 1200 in the X-axis direction, a magnetic flux flows in a direction other than the rolling direction of the grain-oriented electrical steel sheet. The magnetic flux lines in this case generally pass the magnetic flux lines shown in FIG. 1A through the position of the center of gravity (in the portion shown in FIG. 1A) of the iron core block 1200 and in the Y-axis direction (stacked iron core 1000 The shaft extends 180 degrees around an axis extending in the extending (longitudinal) direction of the legs.

  FIG. 2 is a diagram showing an example of the relationship between magnetostriction in a grain-oriented electrical steel sheet and the angle of the excitation direction (direction of magnetic flux lines) from the rolling direction. FIG. 2 shows the relationship when the maximum magnetic flux density Bm is 1.0T. As shown in FIG. 2, the greater the angle of the excitation direction from the rolling direction, the greater the magnetostriction of the grain-oriented electrical steel sheet. In the example shown in FIG. 2, when the angle of the excitation direction from the rolling direction is 90 °, the magnetostriction is about 10 times (that is, about +20 dB) the magnetostriction when this angle is 0 °. Although the grain-oriented electrical steel sheet constituting the stacked iron core 1000 is fixed, it is not fixed so as not to move completely. Due to such magnetostriction, the grain-oriented electrical steel sheet constituting the pile iron core 1000 vibrates, causing noise. Become.

  Therefore, the present inventors reduced the magnetic flux flowing in the direction other than the rolling direction of the grain-oriented electrical steel sheet as generated in the regions 1600 and 1700 of FIG. I thought it could be reduced. The following embodiments of the present invention are based on such knowledge. Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, in the following description, about the same part as the product core 1000 shown in FIG. 1, detailed description is abbreviate | omitted by attaching | subjecting the code | symbol same as the code | symbol attached | subjected to FIG.

(First embodiment)
First, a first embodiment of the present invention will be described.
FIG. 3 is a diagram illustrating an example of a configuration of the iron core 3000 according to the present embodiment. Fig.3 (a) shows the top view of the iron core 3000, FIG.3 (b) shows II sectional drawing (sectional drawing at the time of cutting along II) of Fig.3 (a). .
In Fig.3 (a) and FIG.3 (b), the laminated iron core 3000 is comprised by laminating | stacking a some directional electromagnetic steel plate.
The iron core 3000 has iron core blocks 1100, 1200, 1300, 3400, and 3500.

  The iron core blocks 3400 and 3500 are parts that constitute a yoke of the product iron core 3000. The shapes and sizes of the iron core blocks 3400 and 3500 are the same. In the iron core blocks 3400 and 3500, slits 3410, 3420, 3510 and 3520 are formed with respect to the iron core blocks 1400 and 1500 shown in FIG. The iron core blocks 3400 and 3500 are different from the iron core blocks 1400 and 1500 shown in FIG. 1, and the other points are the same as the iron core blocks 1400 and 1500 shown in FIG.

  As described with reference to FIG. 1 (a), magnetic fluxes flowing in directions other than the rolling direction of the directional electromagnetic steel sheet in the plane parallel to the plate surface of the directional electromagnetic steel sheet are the iron core blocks 1400, 1500 (that is, Among the regions of the yoke), the flow flows to a region between the centers of the iron core blocks 1200 and 1300 in the X-axis direction (regions 1600 and 1700) and a region between the iron core blocks 1100 and 1200 in the X-axis direction. Furthermore, as shown in FIG. 1 (a), the magnetic flux flowing in a direction other than the rolling direction of the grain-oriented electrical steel sheet generally passes through the center in the Y-axis direction of the iron core blocks 1400 and 1500 (that is, the yoke), and the X-axis The distribution is axisymmetric about the axis extending in the direction.

  Therefore, in a plane parallel to the plate surface of the grain-oriented electrical steel sheet, a magnetic flux that flows in a direction other than the rolling direction of the grain-oriented electrical steel sheet is generated (in the example shown in FIG. 1A, areas 1600 and 1700). The magnetic resistance in the direction other than the rolling direction of the grain-oriented electrical steel sheet in the region near the center in the Y-axis direction of the iron core blocks 1400 and 1500 is increased (this does not reject the change in the magnetic resistance in the rolling direction). That is, for example, the magnetic resistance in the rolling direction is allowed to increase at the same time). By doing in this way, the magnetic flux which flows in directions other than the rolling direction of a grain-oriented electrical steel sheet is reduced.

  Therefore, in the present embodiment, of the core block 3400 (that is, the yoke), it is a region between the centers of the iron core blocks 1100 and 1200 in the X-axis direction and near the center of the iron core block 3400 in the Y-axis direction. And slits (holes) 3410, 3420 extending in the X-axis direction into the region between the core blocks 1200, 1300 in the X-axis direction center and in the vicinity of the center of the iron core block 3400 in the Y-axis direction. Form.

  Similarly, among the regions of the iron core block 3500 (that is, the yoke), a region between the centers of the iron core blocks 1100 and 1200 in the X-axis direction, the region near the center of the iron core block 3500 in the Y-axis direction, and the iron core Slits (holes) 3510 and 3520 extending in the X-axis direction are formed in regions between the centers of the blocks 1200 and 1300 in the X-axis direction and in the vicinity of the center of the iron core block 3500 in the Y-axis direction. Hereinafter, an example of the slits 3410, 3420, 3510, and 3520 of the present embodiment will be described.

  The length D1 of the slits 3410, 3420, 3510, 3520 in the X-axis direction (the rolling direction of the directional magnetic steel sheets constituting the iron core blocks 3400, 3500) is the iron core block 3400 constituting the yoke of the stacked iron core 3000. The length in the X-axis direction of 3500 is preferably 0.4 times or more the length D3 in the X-axis direction at a position passing through the center in the Y-axis direction of the slits 3410, 3420 or 3510, 3520. If the length D1 in the X-axis direction of the slits 3410, 3420, 3510, and 3520 is less than this range, the magnetic fluxes 1600 and 1700 shown in FIG. 1A may increase, and the effect of reducing vibration noise may be reduced. Because.

On the other hand, the length D2 of the slits 3410, 3420, 3510, 3520 in the Y-axis direction is less than the length D1 in the X-axis direction, depending on the specifications of the three-phase transformer configured using the product core 3000, etc. What is necessary is just to determine suitably. For example, the length D2 of the slits 3410, 3420, 3510, and 3520 in the Y-axis direction can be set in the range of 2 mm to 30 mm. If the length D2 of the slits 3410, 3420, 3510, 3520 in the Y-axis direction is less than this range, the magnetic flux penetrating the slits 3410, 3420, 3510, 3520 increases and the effect of reducing vibration noise may be reduced. There is. On the other hand, when the length D2 in the Y-axis direction of the slits 3410, 3420, 3510, 3520 exceeds this range, the effect of reducing the vibration noise due to the increase in the maximum magnetic flux density Bm due to the reduction in the cross-sectional area of the iron core blocks 1400, 1500 May be reduced. The Y-axis direction is the rolling direction (X-axis direction) of the directional electrical steel sheets constituting the iron core blocks 3400 and 3500 and the stacking direction (Z-axis direction) of the directional electromagnetic steel sheets constituting the iron core blocks 3400 and 3500. The vertical direction.
Further, the slits 3410, 3420, 3510, 3520 are through holes penetrating in the Z-axis direction (see FIG. 3B).

FIG. 4 is a diagram illustrating an example of a region where slits 3410, 3420, 3510, and 3520 are formed.
The slit 3410 is formed in an area between the centers of the iron core blocks 1100 and 1200 in the X-axis direction in the iron core block 3400. That is, in FIG. 4, the slit 3410 passes through the center in the X-axis direction of the iron core block 1100 and extends in the Y-axis direction through the virtual line 4100 extending in the Y-axis direction and the center in the X-axis direction of the iron core block 1200. It is formed in a region between the virtual line 4200 to be performed.

  Further, the slit 3420 is formed in a region between the centers of the iron core blocks 1200 and 1300 in the X-axis direction in the iron core block 3400. That is, in FIG. 4, the slit 3420 is formed in a region between the virtual line 4200 and a virtual line 4300 extending in the Y-axis direction through the center of the iron core block 1300 in the X-axis direction.

  The slits 3410 and 3420 are formed in a region near the center of the iron core block 3400 in the Y-axis direction. As described above with reference to FIG. 1A, the magnetic resistance in the direction other than the rolling direction of the grain-oriented electrical steel sheet in the vicinity of the center in the Y-axis direction of the iron core blocks 3400 and 3500 This is because it is necessary to make it larger than the magnetoresistance of the region.

  Here, the region in the vicinity of the center in the Y-axis direction of the iron core block 3400 means that the distance in the Y-axis direction from the center position in the Y-axis direction of the iron core block 3400 (yoke) is the Y-axis in the iron core block 3400 (yoke). A region within a range of 0.1 times or less the length in the direction. That is, in FIG. 4, the slits 3410 and 3420 are formed in a region between the virtual lines 4400a and 4500a. Here, the virtual line 4400a is a virtual line extending in the X-axis direction at a position where the distance in the Y-axis direction with the virtual line 4600a is 0.1 times the length D4 of the iron core block 3400 in the Y-axis direction. . The virtual line 4600a is a virtual line that passes through the center of the iron core block 3400 in the Y-axis direction and extends in the X-axis direction. Further, the imaginary line 4500a is on the opposite side to the imaginary line 4400a, and the distance in the Y axis direction with the imaginary line 4600a is 0.1 times the length D4 of the iron core block 3400 in the Y axis direction. This is an imaginary line extending in the direction.

Similarly, the slit 3510 is formed in a region between the centers of the iron core blocks 1100 and 1200 in the width direction in the iron core block 3500. That is, in FIG. 4, the slit 3510 is formed in a region between the virtual lines 4100 and 4200.
Further, the slit 3520 is formed in a region between the centers of the iron core blocks 1200 and 1300 in the width direction in the iron core block 3500. That is, in FIG. 4, the slit 3520 is formed in a region between the virtual lines 4200 and 4300.
In addition, the slits 3510 and 3520 are formed in a region near the center of the iron core block 3500 in the Y-axis direction.

  Here, the area near the center of the iron core block 3500 in the Y-axis direction is determined in the same manner as the iron core block 3400. That is, the area near the center in the Y-axis direction of the iron core block 3500 is the distance in the Y-axis direction from the center position of the iron core block 3500 in the Y-axis direction is 0. 0 of the length of the iron core block 3500 in the Y-axis direction. It refers to the area within the range of 1 time or less. In FIG. 4, the slits 3510 and 3520 are formed in the region between the virtual lines 4400b and 4500b. Here, the virtual line 4400b is a virtual line extending in the X-axis direction at a position where the distance in the Y-axis direction with the virtual line 4600b is 0.1 times the length D4 of the iron core block 3500 in the Y-axis direction. . The virtual line 4600b is a virtual line that passes through the center of the iron core block 3500 in the Y-axis direction and extends in the X-axis direction. Further, the imaginary line 4500b is on the opposite side of the imaginary line 4400b, and the distance in the Y axis direction with the imaginary line 4600b is 0.1 times the length D4 of the iron core block 3500 in the Y axis direction. This is an imaginary line extending in the direction.

A slit-like hole is formed in each of the grain-oriented electrical steel sheets constituting the iron core block 3400 so that the slits 3410 and 3420 as described above are formed. Similarly, slit-like holes are formed in each of the grain-oriented electrical steel sheets constituting the iron core block 3500 so that the slits 3510 and 3520 are formed. That is, the plane shape, size, and position in the XY plane of the hole formed for each grain-oriented electrical steel sheet constituting the iron core block 3400 are respectively set to the plane shape, size, and XY of the slits 3410 and 3420. The position in the plane. Similarly, the plane shape, size, and position in the XY plane of the hole formed for each grain-oriented electrical steel sheet constituting the iron core block 3500 are respectively the plane shape, size, and X− of the slits 3510 and 3520. The position in the Y plane.
In the present embodiment, the shape, size, and position of the holes formed for the grain-oriented electrical steel sheets constituting the iron core blocks 3400 and 3500 are the same.

  The direction in which the rolling direction (direction of the easy axis of magnetization) is the direction of the double arrow line shown beside the RD in FIG. 3A and the planar shape is the same as the planar shape of the iron core blocks 3400 and 3500 Directional electrical steel sheets constituting the iron core blocks 3400 and 3500 can be obtained by punching the magnetic steel sheets with a shear or a die.

  Iron core blocks 3400 and 3500 are obtained by stacking and fixing the grain-oriented electrical steel sheets obtained in this manner so that their contours match each other. As described above, the shape, size, and position of the holes formed in each grain-oriented electrical steel sheet constituting the iron core blocks 3400 and 3500 are the same. Therefore, when these grain-oriented electrical steel sheets are laminated together, the core blocks 3400 and 3500 penetrate through the core blocks 3400 and 3500 in the Z-axis direction, which is the lamination direction of the grain-oriented electrical steel sheets, by the holes formed in the grain-oriented electrical steel sheets. A through hole is formed. In this way, through holes penetrating in the Z-axis direction are obtained as the slits 3410, 3420, 3510, 3520 (see FIG. 3B).

  As described above, in this embodiment, the slits 3410 and 3420 extending in the X-axis direction (the rolling direction of the grain-oriented electrical steel sheet) near the center in the Y-axis direction of the iron core blocks 3400 and 3500 constituting the yoke of the stacked iron core 3000. 3510 and 3520 are formed. Therefore, in the yoke of the stacked core 3000 composed of the core blocks 3400 and 3500, the magnetic resistance in a direction other than the rolling direction (X-axis direction) of the grain-oriented electrical steel sheets constituting the core blocks 3400 and 3500 is (slits 3410 and 3420). , 3510, 3520 can be made larger (this does not reject the change in magnetoresistance in the X-axis direction (ie, all of the regions where slits 3410, 3420, 3510, 3520 are formed). In this case, it is only necessary to increase the magnetic resistance in at least the Y-axis direction as compared with other areas of the yoke. For example, the magnetoresistance in the X-axis direction is allowed to increase simultaneously in the magnetostriction reduction area)). Therefore, the magnetic flux lines shown in FIG. 1A change as shown in FIG. 5, and the magnetic flux generated in the regions 1600 and 1700 can be reduced (the white arrow line in FIG. 5 indicates the direction of the magnetic flux). Show). Thereby, it can suppress that the angle from the rolling direction of an excitation direction (direction of a magnetic flux line) becomes large, and can reduce the magnetostriction which arises in the product core 3000 (refer FIG. 2).

  In the present embodiment, the case where the shapes, sizes, and positions of the holes formed in the grain-oriented electrical steel sheets constituting the iron core blocks 3400 and 3500 are the same has been described as an example. This is preferable because each grain-oriented electrical steel sheet constituting the iron core blocks 3400 and 3500 can be manufactured by the same method. However, at least one of the shape, size, and position of the holes formed in the grain-oriented electrical steel sheets constituting the iron core blocks 3400 and 3500 may be different. In the present embodiment, the case where the slits 3410 and 3420 are through holes penetrating in the Z-axis direction has been described as an example. However, the direction through which the slit passes may be a direction inclined with respect to the Z-axis direction, not the Z-axis direction. Further, the slit may not be a through hole.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. In the first embodiment, one slit 3410, 3420, 3510, and 3520 extending in the X-axis direction is formed in each region near the center in the Y-axis direction of the iron core blocks 3400 and 3500 constituting the yoke of the stacked iron core 3000. The case where it does is explained as an example. On the other hand, in this embodiment, a plurality of holes arranged in the X-axis direction are formed in regions where the slits 3410, 3420, 3510, and 3520 are formed. Thus, the present embodiment and the first embodiment are mainly different in the shape, size, and number of holes formed in the iron core block constituting the yoke of the stacked iron core 3000. Therefore, in the description of the present embodiment, the same parts as those described above are denoted by the same reference numerals as those shown in FIGS.

FIG. 6 is a diagram illustrating an example of the configuration of the product core 6000 according to the present embodiment. FIG. 6A shows a plan view of the iron core 6000, and FIG. 6B shows a cross-sectional view taken along the line II in FIG. 6A (a cross-sectional view taken along the line II). .
6 (a) and 6 (b), the product core 6000 is configured by stacking a plurality of grain-oriented electrical steel sheets.
The iron core 6000 includes iron core blocks 1100, 1200, 1300, 6400, and 6500.

  The iron core blocks 6400 and 6500 are parts that constitute a yoke of the product iron core 6000. The shape and size of the iron core blocks 6400 and 6500 are the same. The iron core blocks 6400 and 6500 are in the X-axis direction (the rolling direction of the grain-oriented electrical steel sheets constituting the iron core blocks 6400 and 6500) in the region where the slits 3410, 3420, 3510 and 3520 described in the first embodiment are formed. Are formed with a plurality of holes. The other points of the iron core blocks 6400 and 6500 are the same as those of the iron core blocks 3400 and 3500 described in the first embodiment.

  In the first embodiment, the slit 3410 is formed in a region surrounded by virtual lines 4100, 4200, 4400a, and 4500a in FIG. 4 in the region of the iron core block 3400. Further, a slit 3420 is formed in a region surrounded by virtual lines 4200, 4300, 4400a, and 4500a in FIG. 4 in the region of the iron core block 3400. These slits 3410 and 3420 have a length in the X-axis direction of D1, and a length in the Y-axis direction of D2.

  In the present embodiment, it is a region inside such a region (region surrounded by virtual lines 4100, 4200, 4400a, 4500a in FIG. 4) in the iron core block 6400, and the length in the X-axis direction is D1, and Y A plurality of holes (hole groups 6410 and 6420) arranged in the X-axis direction are formed in a region where the axial length is D2. At this time, as shown in FIG. 6A, the hole group 6410, 6420 has one end in the X-axis direction (end on the negative direction side of the X-axis) (the one end (negative direction in the X-axis) side). The length in the X-axis direction (ie, the X-axis) from the hole (the end on the other end (X-axis positive direction) side) of the other end (end on the positive direction side of the X-axis) The longest distance in the direction is set to D1.

  Similarly, in 1st Embodiment, the slit 3510 is formed in the area | region enclosed by the virtual lines 4100, 4200, 4400b, and 4500b of FIG. Further, a slit 3520 is formed in a region surrounded by virtual lines 4200, 4300, 4400b, and 4500b in FIG. 4 in the region of the iron core block 3500. The lengths of these slits 3510 and 3520 in the X-axis direction are D1, and the length in the Y-axis direction is D2.

In the present embodiment, the iron core block 6500 is arranged in the X-axis direction in an area inside such an area, in which the length in the X-axis direction is D1 and the length in the Y-axis direction is D2. A plurality of holes (hole groups 6510 and 6520) are formed. At this time, as shown in FIG. 6A, the hole group 6510, 6520 has one end in the X-axis direction (end on the negative direction side of the X-axis) (the one end (negative direction in the X-axis) side) The length in the X-axis direction (ie, the X-axis) from the hole (the end on the other end (X-axis positive direction) side) of the other end (end on the positive direction side of the X-axis) The longest distance in the direction is set to D1.
The first embodiment describes that the length D1 is desirably 0.4 times or more of the length D3 and that the length D2 is desirably in the range of 2 mm to 30 mm. Is the same as
The shapes and sizes of the holes constituting the hole groups 6410, 6420, 6510, 6520 are the same, and the intervals between the holes constituting the hole groups 6410, 6420, 6510, 6520 are the same. In the example shown in FIG. 6A, the planar shape of each hole forming the hole groups 6410 and 6510 is a circle, and the diameter of the hole is D2. It should be noted that the shape of the holes constituting the hole groups 6410 and 6510 may be a shape other than a circle (for example, an ellipse, a square, or a rectangle). Moreover, the hole which comprises the hole group 6410, 6420, 6510, 6520 is a through-hole penetrated to a Z-axis direction (refer FIG.6 (b)).

  Circular holes are formed in each of the grain-oriented electrical steel sheets constituting the iron core blocks 6400 and 6500 so that the hole groups 6410, 6420, 6510, and 6520 as described above are formed. In the present embodiment, the shape, size, and position of the holes formed in each grain-oriented electrical steel sheet constituting the iron core blocks 6400, 6500 are the same.

  The direction in which the rolling direction (direction of the easy axis of magnetization) is the direction of the double arrow line shown beside the RD in FIG. 6A and the planar shape is the same as the planar shape of the iron core blocks 6400 and 6500 Directional electrical steel sheets constituting the iron core blocks 6400 and 6500 can be obtained by punching the magnetic steel sheets with shear or die.

  The core blocks 6400 and 6500 are obtained by laminating and fixing the grain-oriented electrical steel sheets obtained in this manner so that their contours match each other. As described above, the shape, size, and position of the holes formed in each grain-oriented electrical steel sheet constituting the iron core blocks 6400, 6500 are the same. Therefore, when these grain-oriented electrical steel sheets are laminated with each other, the core blocks 6400 and 6500 penetrate through the Z-axis direction, which is the direction of lamination of the grain-oriented electrical steel sheets, by the holes formed in the grain-oriented electrical steel sheets. A through hole is formed. In this manner, through-holes penetrating in the Z-axis direction are obtained as the holes constituting the hole groups 6410, 6420, 6510, 6520 (see FIG. 6B).

  As described above, in the present embodiment, the core blocks 6400 and 6500 constituting the yoke of the stacking iron core 6000 are formed from a plurality of holes arranged in the X-axis direction in each of the regions extending in the X-axis direction near the center in the Y-axis direction. A hole group 6410, 6420, 6510, 6520 is formed, and a magnetic resistance in at least the Y-axis direction is increased in a part of the region (region in which the hole is formed) as compared with other regions of the yoke. Even in this case, the same effect as described in the first embodiment can be obtained.

  Also in this embodiment, as explained in the first embodiment, at least one of the shape, size, and position of the hole formed in each grain-oriented electrical steel sheet constituting the iron core blocks 6400, 6500. May be different. Further, the direction through which the holes formed in the iron core blocks 6400 and 6500 penetrate may be a direction inclined with respect to the Z-axis direction instead of the Z-axis direction. Further, these holes may not be through holes.

(Modification)
In the first embodiment, the case where the slits 3410, 3420, 3510, and 3520 extending in the X-axis direction are formed in the vicinity of the center in the Y-axis direction of the iron core blocks 3400 and 3500 has been described as an example. In the second embodiment, the case where the hole groups 6410, 6420, 6510, and 6520 extending in the X-axis direction are formed in regions near the center in the Y-axis direction of the iron core blocks 6400 and 6500 has been described as an example. By combining these, a slit extending in the X-axis direction and a hole may be arranged side by side in the X-axis direction in a region near the center in the Y-axis direction of the iron core block constituting the yoke of the core.

FIG. 7 is a diagram illustrating an example of the configuration of the product core 7000 according to the present modification. Fig.7 (a) shows the top view of the iron core 7000, FIG.7 (b) shows II sectional drawing (sectional drawing at the time of cutting along II) of Fig.7 (a). .
In Fig.7 (a) and FIG.7 (b), the laminated iron core 7000 is comprised by laminating | stacking a some directional electromagnetic steel plate.
The iron core 7000 includes iron core blocks 1100, 1200, 1300, 7400, and 7500.

  The iron core blocks 7400 and 7500 are parts that constitute a yoke of the product iron core 7000. The core blocks 7400 and 7500 have the same shape and size. The iron core blocks 7400 and 7500 have a slit X, which is described in the first embodiment 3410, 3420, 3510, 3520, and the hole group 6410, 6420, 6510, 6520 described in the second embodiment. Two slits are placed between the two in the region where the length in the axial direction (the rolling direction of the directional electrical steel sheets constituting the iron core blocks 7400 and 7500) is long and the length in the Y-axis direction is the same. Then, these slits and holes are formed side by side in the X-axis direction. The other points of the iron core blocks 7400 and 7500 are the same as the iron core blocks 3400, 3500, 6400, and 6500 described in the first embodiment and the second embodiment.

  In this modification, there are four such regions. As shown in FIG. 7A, these four regions include a region in which slits 7411, holes 7412, and slits 7413 are formed, a region in which slits 7421, holes 7422, and slits 7423 are formed, and a slit 7511. , A region where a hole 7512 and a slit 7513 are formed, and a region where a slit 7521, a hole 7522 and a slit 7523 are formed. The slits 7411, 7413, 7421, 7423, 7511, 7513, 7521, and 7523 are slits extending in the X-axis direction. In the example shown in FIG. 7A, the planar shape of each hole constituting the holes 7412, 7422, 7512, 7522 is a circle, the diameter of the hole, and slits 7411, 7413, 7421, 7423, 7511, 7513, 7521. , 7523 in the Y-axis direction is D2. This length D2 is the length of the four regions described above in the Y-axis direction. Further, as shown in FIG. 7A, the length in the X-axis direction of the four regions described above is D1. The first embodiment describes that the length D1 is desirably 0.4 times or more of the length D3 and that the length D2 is desirably in the range of 2 mm to 30 mm. Is the same as

  The planar shape of the holes 7412, 7422, 7512, 7522 may be a shape other than a circle (for example, an ellipse, a square, or a rectangle) as described in the second embodiment. In addition, the slits 7411, 7413, 7421, 7423, 7511, 7513, 7521, 7523 and the holes 7412, 7422, 7512, 7522 are through holes penetrating in the Z-axis direction (see FIG. 7B). The direction through which these penetrate is not the Z-axis direction but may be a direction inclined with respect to the Z-axis direction. These may not be through holes. Further, the lengths of the slits 7411, 7413, 7421, 7423, 7511, 7513, 7521, 7523 in the Y-axis direction and the diameters of the holes 7412, 7422, 7512, 7522 (for example, diameters, minor diameters) may be different. Good. Further, the number of slits and holes formed in each region is not limited to the number shown in FIGS. 7A and 7B as long as it is one or more.

(Third embodiment)
Next, a third embodiment will be described. In the first embodiment and the second embodiment, a case where a slit or a hole is formed inside the iron core blocks 3400, 3500, 6400, 6500, 7400, 7500 constituting the yokes of the stacked iron cores 3000, 6000, 7000. Explained with an example. On the other hand, in the present embodiment, the iron core block constituting the yoke of the stacked iron core is divided into two in the Y-axis direction, and a gap is provided between the two iron core blocks. Thus, the present embodiment, the first embodiment, and the second embodiment are mainly different in the configuration of the iron core block constituting the yoke of the product iron core. Therefore, in the description of the present embodiment, the same parts as those described above are denoted by the same reference numerals as those shown in FIGS.

FIG. 8 is a diagram illustrating an example of the configuration of the iron core 8000 according to the present embodiment. Fig.8 (a) shows the top view of the iron core 8000, FIG.8 (b) shows II sectional drawing (sectional drawing at the time of cutting along II) of Fig.8 (a). .
8 (a) and 8 (b), the product core 8000 is configured by stacking a plurality of grain-oriented electrical steel sheets.
The iron core 8000 includes iron core blocks 1100, 1200, 1300, 8401, 8402, 8403, 8501, 8502, and 8503.
The iron core blocks 8401, 8402, and 8403 are parts that constitute a yoke of the product iron core 8000. The iron core blocks 8501, 8502, and 8503 are also parts that constitute the yoke of the product iron core 8000. The shape and size of the iron core blocks 8401 and 8501 are the same. Moreover, the shape and size of the iron core blocks 8402, 8403, 8502, 8503 are the same.

  The iron core blocks 8401 and 8501 are configured by laminating grain-oriented electrical steel sheets having an isosceles trapezoidal shape in a planar shape. Of the upper and lower bases of the isosceles trapezoid, the length of the longer side is the plane shape of the iron core blocks 3400, 3500, 6400, 6500, 7400, 7500 (in contrast to the isosceles trapezoid, In the upper base and the lower base, the length of the short side is the same as the length of the longest side (the side facing the recessed part). The shorter side of the isosceles trapezoidal upper and lower bases is longer than 1/2 times the length D3. The height of the isosceles trapezoid is 1 of the length in the Y-axis direction of the planar shape of the iron core blocks 3400, 3500, 6400, 6500, 7400, 7500 described in the first embodiment and the second embodiment. / Less than 2 times.

  Here, the rolling direction (the direction of the easy axis of magnetization) is the direction of the double arrow line shown beside the RD in FIG. 8A, and the planar shape is the same as the planar shape of each of the iron core blocks 8401 and 8501. In this way, the grain-oriented electrical steel sheets constituting the iron core blocks 8401 and 8501 are obtained by shearing or punching the grain-oriented electrical steel sheets with a mold. Each of the core blocks 8401 and 8501 is obtained by laminating and fixing such grain-oriented electrical steel sheets so that their contours match each other.

  The iron core blocks 8402, 8403, 8502, and 8503 are configured by laminating directional electrical steel sheets that are planar with an isosceles trapezoidal shape. The length of the shorter side of the upper and lower bases of the isosceles trapezoid is the shortest distance between two mutually adjacent legs (core blocks 1100 and 1200 and core blocks 1200 and 1300) of the core 8000. It is the same as the length of the distance D. On the other hand, the length of the shorter side of the upper and lower bases of the isosceles trapezoid is the shorter side of the upper and lower bases of the isosceles trapezoids having the planar shape of the iron core blocks 8401 and 8501. Less than 1/2 times the length of. Further, the height of the isosceles trapezoid is 1 of the length in the Y-axis direction of the planar shape of the iron core blocks 3400, 3500, 6400, 6500, 7400, 7500 described in the first and second embodiments. / Less than 2 times.

  Here, the rolling direction (the direction of the easy axis) is the direction of the double arrow line shown beside the RD in FIG. 8A, and the planar shape is the plane of each of the iron core blocks 8402, 8403, 8502, 8503. The grain-oriented electrical steel sheets constituting the respective iron core blocks 8402, 8403, 8502, 8503 are obtained by shearing or punching the grain-oriented electrical steel sheets with a die so as to have the same shape. Each of the core blocks 8402, 8403, 8502, and 8503 is obtained by stacking and fixing such grain-oriented electrical steel sheets so that their contours match each other.

  The shorter side of the upper and lower bases of the isosceles trapezoid that constitutes the planar shape of the iron core block 8401 and the upper and lower bases of the isosceles trapezoid that constitutes the planar shape of the iron core blocks 8402 and 8403 It arrange | positions so that a longer side may mutually oppose with a space | interval, and it fixes. Similarly, the shorter side of the upper and lower bases of the isosceles trapezoid that forms the planar shape of the iron core block 8501, and the upper and lower bases of the isosceles trapezoid that forms the planar shape of the iron core blocks 8502 and 8503 It arrange | positions so that the longer side may mutually oppose with a space | interval, and it fixes. As described above, gaps 8410, 8420, 8510, 8520 are formed between the iron core block 8401 and the iron core blocks 8402, 8403, and between the iron core block 8501 and the iron core blocks 8502, 8503, respectively. These gaps 8410, 8420, 8510, 8520 are through holes that penetrate in the Z-axis direction (see FIG. 8B).

  When the iron core blocks 8401, 8402, and 8403 are arranged so that the gaps 8410 and 8420 are formed as described above, the outer shape and size thereof will be described in the first embodiment and the second embodiment. The outer shape and size of the iron core blocks 3400, 6400, and 7400 are the same. Similarly, when the iron core blocks 8501, 8502, 8503 are arranged so that the gaps 8510, 8520 are formed as described above, the outer shape and size thereof are the same as those in the first embodiment and the second embodiment. The outer shape and size of the described iron core blocks 3500, 6500, and 7500 are the same.

  In the first embodiment and the second embodiment, a slit extending in the X-axis direction and a hole aligned in the X-axis direction are formed in a part of the vicinity of the center in the Y-axis direction of the yokes of the stacked cores 3000, 6000, and 7000. Is formed. On the other hand, in the present embodiment, gaps 8410, 8420, 8510, 8520 extending in the X-axis direction are formed in the entire region near the center in the Y-axis direction of the yoke of the stacked core 8000. As described above, in the present embodiment, the lengths of the gaps 8410 and 8420 in the X-axis direction are D1, and the length in the Y-axis direction is D2. It is desirable that the length D2 be in the range of 2 mm or more and 30 mm or less, as described in the first embodiment. Further, the length D1 of the gaps 8410 and 8402 in the X-axis direction is approximately 0.5 times (0.4 or more) the length D3.

As described above, in this embodiment, the gaps 8410, 8420, 8510, 8520 extending in the X-axis direction are formed in the entire vicinity of the center of the yoke of the stacked core 8000 in the Y-axis direction. Even in this case, the same effect as described in the first embodiment can be obtained. However, compared to the first and second embodiments, the number of iron core blocks constituting the yoke is increased, and the work load for constituting the yoke is increased. The first embodiment and the second embodiment are preferable to the embodiment.
A non-magnetic and non-conductive member may be inserted (arranged) into the gaps 8410, 8420, 8510, 8520.

(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described. In the first to third embodiments, holes (slits 3410, 3420, 3510, 3520, 7411) formed in the yoke (iron block 3400, 3500, 6400, 6500, 7400, 7500, 8401-8403, 8501-8503). 7413, 7421, 7423, 7511, 7513, 7521, 7523, holes constituting the hole groups 6410, 6420, 6510, 6520, holes 7412, 7422, 7521, 7522, slits 8410, 8420, 8510, 8520). The case of a space (a state in which nothing is inserted) has been described as an example. If it does in this way, distribution of magnetic flux of product cores 3000, 6000, 7000, and 8000 can be changed so that magnetostriction may reduce.

  However, the holes formed in the core blocks 3400, 3500, 6400, 6500, 7400, 7500, 8401-8403, 8501-8503 reduce the cross-sectional area perpendicular to the direction of the main magnetic flux in those core blocks. Then, the maximum magnetic flux density Bm in the iron core blocks 3400, 3500, 6400, 6500, 7400, 7500, 8401-8403, and 8501-8503 is increased. FIG. 9 is a diagram showing an example of the relationship between the maximum magnetic flux density and magnetostriction in the grain-oriented electrical steel sheet. As shown in FIG. 9, the magnetostriction increases as the maximum magnetic flux density increases. Therefore, it is preferable to reduce the magnetostriction resulting from this. Therefore, in this embodiment, a case where a soft magnetic material is inserted into the slits 3410, 3420, 3510, 3520 described in the first embodiment will be described as an example. As described above, the product core of the present embodiment is obtained by inserting a soft magnetic material into the slits 3410, 3420, 3510, and 3520 with respect to the product core 3000 of the first embodiment. Therefore, in the description of the present embodiment, the same parts as those described above are denoted by the same reference numerals as those shown in FIGS.

FIG. 10 is a diagram illustrating an example of the configuration of the iron core 10000 according to the present embodiment. Fig.10 (a) shows the top view of the iron core 10000, FIG.10 (b) shows II sectional drawing (sectional drawing at the time of cutting along II) of Fig.10 (a). . In the present embodiment, the case where the soft magnetic material inserted into the slits 3410, 3420, 3510, and 3520 described in the first embodiment is a grain-oriented electrical steel sheet will be described as an example.
The iron core 10000 includes core blocks 1100, 1200, 1300, 3400, 3500, 10410, 10420, 10510, and 10520.

As described above, the iron core blocks 1100, 1200, 1300, 3400, and 3500 are the same as those in the first embodiment.
The iron core blocks 10410, 10420, 10510, 10520 are configured by laminating grain-oriented electrical steel sheets. The shape and size of the iron core blocks 10410, 10420, 10510, 10520 are made the same as the shape and size of the space inside the slits 3410, 3420, 3510, 3520 of the iron core blocks 3400, 3500. However, it is preferable that the size of the iron core blocks 10410, 10420, 10510, 10520 is (slightly) smaller than the size of the space inside the slits 3410, 3420, 3510, 3520 of the iron core blocks 3400, 3500. This is because the iron core blocks 10410, 10420, 10510, 10520 can be easily inserted into the slits 3410, 3420, 3510, 3520 of the iron core blocks 3400, 3500.

FIG. 11 is an enlarged view showing a portion of the iron core block 10410 in FIG.
As described in the first embodiment, in the region where the slit 3410 is formed, it is necessary to increase the magnetic resistance in a direction other than the X-axis direction on the XY plane. The permeability in the laminating direction of the grain-oriented electrical steel sheet is far smaller than the permeability in the rolling direction of the grain-oriented electrical steel sheet. This is because the magnetic permeability in the thickness direction of the grain-oriented electrical steel sheet is small, and a non-magnetic material (such as air) exists between the grain-oriented electrical steel sheets. Therefore, as shown in FIGS. 10 and 11, the plate surface of the directional electromagnetic steel plate constituting the iron core block 10410 is parallel to the X-axis direction and the plate surface of the directional electromagnetic steel plate constituting the iron core block 3400. To be vertical. That is, the stacking direction of the grain-oriented electrical steel sheets constituting the iron core block 10410 is defined as the Y-axis direction. The above is the same for the iron core blocks 10420, 10510, and 10520.

  Also in the slit 3410, similarly to the core block 3400, the maximum magnetic flux density Bm of the product core 10000 is reduced by reducing the magnetic resistance in the X-axis direction. Therefore, the rolling direction of the grain-oriented electrical steel sheet constituting the iron core block 10410 is defined as the X-axis direction (that is, the rolling direction of the grain-oriented electrical steel sheet constituting the iron core block 3400). The same applies to the iron core blocks 10420, 10510, and 10520.

  Directional electrical steel sheets constituting each of the iron core blocks 10410, 10420, 10510, 10520 by shearing or punching the directional electrical steel sheets with a mold so that the iron core blocks 10410, 10420, 10510, 10520 as described above are formed. Is obtained. Each core block 10410 is formed by stacking and fixing such directional electrical steel sheets so as to match the shapes of the slits 3410, 3420, 3510, 3520 and the rolling direction to be the same direction. , 10420, 10510, 10520 are obtained.

  As described above, in the present embodiment, a plurality of grain-oriented electrical steel sheets (iron block 10410) are provided in the slits 3410, 3420, 3510, and 3520 such that the rolling direction is the X-axis direction and the lamination direction is the Y-axis direction. , 10420, 10510, 10520). Therefore, in addition to the effect described in the first embodiment, the effect that the maximum magnetic flux density Bm in the product core 10000 can be suppressed by forming the slits 3410, 3420, 3510, 3520 can be obtained. .

  In this embodiment, the case where the core blocks 10410, 10420, 10510, and 10520 are configured by stacking a plurality of grain-oriented electrical steel sheets has been described as an example. However, the number of grain-oriented electrical steel sheets inserted into the slits 3410, 3420, 3510, 3520 may be one. Also in this case, as described above, the plate surface of the directional electromagnetic steel plate is parallel to the X-axis direction and is perpendicular to the plate surfaces of the directional electromagnetic steel plates constituting the iron core blocks 3400 and 3500. To do.

  Moreover, in this embodiment, the case where a grain-oriented electrical steel sheet was used was described as an example. This is preferable because the magnetic resistance in the X-axis direction in the slits 3410, 3420, 3510, and 3520 can be reduced. However, a non-oriented electrical steel sheet may be used instead of the grain-oriented electrical steel sheet. Also in this case, as described above, the plate surface of the non-oriented electrical steel plate is parallel to the X-axis direction and is perpendicular to the plate surface of the directional electromagnetic steel plate constituting the iron core blocks 3400 and 3500. To.

  Moreover, what is inserted into the slits 3410, 3420, 3510, and 3520 does not necessarily have to be a plate shape as long as it is a soft magnetic material. However, the slits 3410, 3420, 3510, and 3520 are soft inside the slits 3410, 3420, 3510, and 3520 so that the magnetic resistance in the Y-axis direction of the core blocks 3400 and 3500 is larger than the magnetic resistance in the Y-axis direction. Insert a magnetic material. If a soft magnetic material is inserted into the slits 3410, 3420, 3510, 3520, the magnetic resistance in the X-axis direction inside the slits 3410, 3420, 3510, 3520 is the inside of the slits 3410, 3420, 3510, 3520. Is smaller than that in the case of a space (a state in which nothing is inserted). Therefore, the effect of suppressing the increase in the maximum magnetic flux density of the core product can be obtained without considering the magnetic resistance in the X-axis direction of the soft magnetic material inserted into the slits 3410, 3420, 3510, 3520 (slit 3410). 3420, 3510, and 3520, as described above, it is preferable to make the magnetic resistance in the X-axis direction of the soft magnetic material inserted into the interior of the soft magnetic material as small as possible.

  Further, the closer the shape and size of the iron core blocks 10410, 10420, 10510, 10520 to the shape and size of the space inside the slits 3410, 3420, 3510, 3520 of the iron core blocks 3400, 3500, the more the iron core blocks 10410, 10420 are. , 10510, 10520 and the iron core blocks 3400, 3500 can be reduced, which is preferable. However, it is not necessary to match the shape and size of the iron core blocks 10410, 10420, 10510, 10520 with the shape and size of the space inside the slits 3410, 3420, 3510, 3520 of the iron core blocks 3400, 3500. For example, the shape of the iron core blocks 10410, 10420, 10510, 10520 may be different from the shape of the space inside the slits 3410, 3420, 3510, 3520 of the iron core blocks 3400, 3500.

(Fifth embodiment)
Next, a fifth embodiment of the present invention will be described. In the present embodiment, a case where a soft magnetic material is inserted into the holes constituting the hole groups 6410, 6420, 6510, 6520 described in the second embodiment will be described as an example. As described above, the iron core of the present embodiment is obtained by inserting a soft magnetic material into the holes constituting the hole groups 6410, 6420, 6510, and 6520 with respect to the iron core 6000 of the second embodiment. Therefore, in the description of the present embodiment, the same parts as those described above are denoted by the same reference numerals as those shown in FIGS.

  FIG. 12 is a diagram illustrating an example of the configuration of the iron core 12000 according to the present embodiment. Fig.12 (a) shows the top view of the stacked iron core 12000, FIG.12 (b) shows II sectional drawing (sectional drawing at the time of cutting along II) of Fig.12 (a). . In the present embodiment, the case where the soft magnetic body inserted into the holes constituting the hole groups 6410, 6420, 6510, 6520 described in the second embodiment is a grain-oriented electrical steel sheet will be described as an example. . FIG. 13 is an enlarged view showing a portion of the iron core block 12410 in FIG.

  The stacked iron core 12000 includes iron core blocks 1100, 1200, 1300, 6400, 6500, 12410, 12420, 12510, and 12520. In FIG. 12, for convenience of description, reference numerals are omitted, but the same iron core block as the iron core blocks 12410, 12420, 12510, 12520 is provided in all the holes constituting the hole groups 6410, 6420, 6510, 6520. Is inserted.

  The iron core blocks 12410, 12420, 12510, and 12520 are only different in shape and size from the iron core blocks 10410, 10420, 10510, and 10520 described in the fourth embodiment.

  That is, the iron core blocks 12410, 12420, 12510, 12520 are configured by laminating grain-oriented electrical steel sheets. The shape and size of the iron core blocks 12410, 12420, 12510, 12520 are made to be the same as (slightly) smaller than the shape and size of the holes constituting the hole group 6410, 6420, 6510, 6520. Further, the plate surfaces of the directional electromagnetic steel plates constituting the iron core blocks 12410, 12420, 12510, 12520 are parallel to the X-axis direction and are perpendicular to the plate surfaces of the directional electromagnetic steel plates constituting the iron core blocks 6400, 6500. To be. Further, the rolling direction of the grain-oriented electrical steel sheets constituting the iron core blocks 12410, 12420, 12510, 12520 is defined as the X-axis direction (that is, the rolling direction of the grain-oriented electrical steel sheets constituting the iron core blocks 6400, 6500).

As described above, in the present embodiment, a plurality of directional electromagnetic waves are formed in the holes constituting the hole groups 6410, 6420, 6510, and 6520 so that the rolling direction is the X-axis direction and the stacking direction is the Y-axis direction. Steel plates (iron core blocks 12410, 12420, 12510, 12520) are inserted. Even in this case, the same effect as described in the fourth embodiment can be obtained.
Also in the present embodiment, the modification described in the fourth embodiment can be employed with respect to the soft magnetic material inserted into the holes constituting the hole groups 6410, 6420, 6510, and 6520. In addition, a soft magnetic material may be inserted into the slits 7411, 7413, 7421, 7423, 7511, 7513, 7521, 7523 and the holes 7412, 7422, 7512, 7522 described in the above (Modification) section. .

(Sixth embodiment)
Next, a sixth embodiment of the present invention will be described. In the present embodiment, a case where a soft magnetic material is inserted into the slits 8410, 8420, 8510, 8520 described in the third embodiment will be described as an example. As described above, the product core of the present embodiment is obtained by inserting a soft magnetic material into the slits 8410, 8420, 8510, and 8520 with respect to the product core 8000 of the third embodiment. Therefore, in the description of the present embodiment, the same parts as those described above are denoted by the same reference numerals as those shown in FIGS.

  FIG. 14 is a diagram illustrating an example of the configuration of the product core 14000 according to the present embodiment. Fig.14 (a) shows the top view of the stacked iron core 14000, FIG.14 (b) shows II sectional drawing (sectional drawing at the time of cutting along II) of Fig.14 (a). . In this embodiment, the case where the soft magnetic material inserted into the slits 8410, 8420, 8510, 8520 described in the third embodiment is a grain-oriented electrical steel sheet will be described as an example. FIG. 15 is an enlarged view showing portions of the iron core blocks 14410 and 14420 in FIG. FIG. 15A shows an iron core block 14410, and FIG. 15B shows an iron core block 14420.

  The stacked iron core 14000 includes iron core blocks 1100, 1200, 1300, 8401-8403, 8501-8503, 14410, 14420, 14510, 14520.

  The iron core blocks 14410, 14420, 14510, 14520 are only different in shape and size from the iron core blocks 10410, 10420, 10510, 10520, 12410, 12420, 12510, 12520 described in the fourth and fifth embodiments. It is.

  That is, the iron core blocks 14410, 14420, 14510, 14520 are configured by laminating grain-oriented electrical steel sheets. The shape and size of the iron core blocks 14410, 14420, 14510, 14520 are made to be the same as (slightly) smaller than the shape and size of the gaps 8410, 8420, 8510, 8520. Moreover, the plate | board surface of the directional electrical steel plate which comprises the iron core blocks 14410, 14420, 14510, 14520 becomes parallel to the X-axis direction, and the directional electrical steel plate which comprises the iron core blocks 8401-8403, 8501-8503 Be perpendicular to the plate surface. Further, the rolling direction of the grain-oriented electrical steel sheets constituting the iron core blocks 14410, 14420, 14510, 14520 is the X-axis direction (that is, the rolling direction of the grain-oriented electrical steel sheets constituting the iron core blocks 8401-8403, 8501-8503). To do.

As described above, in the present embodiment, a plurality of grain-oriented electrical steel sheets (iron core blocks) are provided in the hole gaps 8410, 8420, 8510, 8520 such that the rolling direction is the X-axis direction and the lamination direction is the Y-axis direction. 14410, 14420, 14510, 14520). Even in this case, the same effect as described in the fourth embodiment can be obtained.
Also in the present embodiment, the modification described in the fourth embodiment can be employed with respect to the soft magnetic material inserted into the gaps 8410, 8420, 8510, 8520.

  Further, in the present embodiment, as illustrated in FIG. 15, the case where the core blocks 14410 and 14420 are independent core blocks without being separated has been described as an example. However, the iron core blocks 14410 and 14420 (part of them) may not be separated. FIG. 16 is a diagram illustrating an example of a configuration of an iron core block 14430 that is a modified example of the iron core blocks 14410 and 14420.

The outer shape and size of the iron core block 14430 are the same as the (whole) outer shape and size of the iron core blocks 14410 and 14420 arranged as shown in FIG.
In the iron core block 14430, the directional electromagnetic steel sheets located in the mutually contacting portions of the iron core blocks 14410 and 14420 arranged as shown in FIG. 14 are separately provided in the area of the iron core block 14410 and the area of the iron core block 14420. The directional electrical steel sheet is not a single directional electrical steel sheet. Other configurations of the iron core block 14430 are the same as those of the iron core blocks 14410 and 14420.
In this way, it is possible to reduce the magnetic resistance in the portion of the iron core blocks 14410 and 14420 shown in FIG.
The same applies to the iron core blocks 14510 and 14520.

  In each of the above-described embodiments, the shape, size, and position may not be exactly the same, for example, within a design tolerance range of a three-phase transformer, It shall be the same. Similarly, the parallel and vertical directions may not be strictly parallel and vertical. For example, they are parallel and vertical as long as they are within the design tolerance of the three-phase transformer.

(Other embodiments)
It should be noted that the embodiments of the present invention described above are merely examples of implementation in carrying out the present invention, and the technical scope of the present invention should not be construed as being limited thereto. Is. That is, the present invention can be implemented in various forms without departing from the technical idea or the main features thereof.

(Relationship between claims and embodiments)
Below, an example of the relationship between description of a claim and description of embodiment is shown. As described above, the description of the claims is not limited to the description of the embodiments.
<Claim 1>
The plurality of legs are realized by, for example, iron core blocks 1100, 1200, and 1300.
The two legs at positions adjacent to each other are realized by, for example, iron core blocks 1100 and 1200 and iron core blocks 1200 and 1300.
The yoke is realized by, for example, iron core blocks 3400, 3500, 6400, 6500, 7400, 7500, 8401-8403, 8501-8503.
The extending direction (first direction) of the plurality of legs is realized by, for example, the Y-axis direction.
The fact that the direction of lamination of the grain-oriented electrical steel sheets constituting the legs and the direction of lamination of the grain-oriented electrical steel sheets constituting the yoke are the same, for example, It is realized that the lamination direction of the steel sheets and the lamination direction of the directional electromagnetic steel sheets constituting the iron core blocks 3400, 3500, 6400, 6500, 7400, 7500, 8401-8403, 8501-8503 are both in the Z-axis direction. The
The rolling direction of the grain-oriented electrical steel sheets constituting the legs is parallel to the first direction that is the extending direction of the legs, for example, the grain-oriented electrical steel sheets constituting the iron core blocks 1100, 1200, 1300. This is realized when the rolling direction is the Y-axis direction.
The first direction that is the extending direction of the legs and the second direction that is the stacking direction of the grain-oriented electrical steel sheets are realized by, for example, the Z-axis direction.
The third direction is realized by the X-axis direction, for example.
The magnetostriction reduction region is, for example, in FIGS. 3 (a), 6 (a), 7 (a), 8 (a), 10 (a), 12 (a), and 14 (a). This is realized by a region indicating D1 as the length in the X-axis direction and D2 as the length in the Y-axis direction.
The length of the magnetostriction reduction region in the third direction is longer than the length of the magnetostriction reduction region in the first direction, for example, FIG. 3 (a), FIG. 6 (a), FIG. a), FIG. 8 (a), FIG. 10 (a), FIG. 12 (a), and FIG. 14 (a), the length D1 in the X-axis direction is longer than the length D2 in the Y-axis direction. Is done.
<Claim 2>
The length in the third direction of the magnetostriction reducing region is the length in the third direction of the grain-oriented electrical steel sheet constituting the yoke, and the center in the first direction of the magnetostriction reducing region. 4 or more times the length in the third direction at a position passing through FIG. 3 (a), FIG. 6 (a), FIG. 7 (a), FIG. 8 (a), FIG. The length D1 shown in a), FIG. 12A, and FIG. 14A is realized by 0.4 times or more of the length D3.
<Claim 3>
The position of the center of the magnetostriction reducing region in the first direction is within a range of 0.1 times or less the length of the yoke in the first direction from the position of the center of the yoke in the first direction. For example, in FIG. 4, the slits 3412 and 3420 are formed in the region between the virtual lines 4400a and 4500a, and the slits 3512 and 3520 are formed in the region between the virtual lines 4400b and 4500b. It is realized by doing.
<Claim 4>
The magnetostriction reducing region is a partial region of the yoke, and is in each of the regions between the centers of the two legs at the positions adjacent to each other, for example, The slit 3412 is formed in the region between the virtual lines 4120 and 4200, and the slit 3420 is formed in the region between the virtual lines 4200 and 4300.
<Claim 5>
The presence of one hole in each of the magnetostriction reduction regions means that, for example, as shown in FIGS. 3 and 10, D1 is indicated as the length in the X-axis direction and D2 is indicated as the length in the Y-axis direction. This is realized by having one slit 3410, 3420, 3510, and 3520 in each region.
<Claim 6>
Each of the magnetostriction reduction regions has a plurality of holes arranged in the third direction. For example, as shown in FIGS. 6 and 12, the length in the X-axis direction is D1, and the length in the Y-axis direction is This is realized by the presence of the hole groups 6410, 6420, 6510, 6520 in the region indicating D2.
<Claim 7>
The inside of the hole is a space, for example, as shown in FIGS. 3, 6, 7, and 8, slits 3410, 3420, 3510, 3520, 7411, 7413, 7421, 7423, 7511. 7513, 7521, 7523, hole groups 6410, 6420, 6510, 6520, holes 7412, 7422, 7512, 7522, and gaps 8410, 8420, 8510, 8520 are realized by spaces. .
<Claims 8 to 10>
The presence of a soft magnetic material inside the hole means that, for example, slits 3410, 3420, 3510, 3520, 7411, 7413, 7421, 7423, 7511, 7513, 7521, 7523, hole groups 6410, 6420, 6510, 6520. , Holes 7412, 7422, 7512, 7522, gaps 8410, 8420, 8510, 8520, iron core blocks 10410, 10420, 10510, 10520, 12410, 12420, 12510, 12520, 14410, 14420, 14510, 14520, 14520, 14520 Realized by being.
The plate surface of the electromagnetic steel sheet inside the hole is parallel to the third direction and is perpendicular to the plate surface of the directional electromagnetic steel plate constituting the yoke, for example, FIG. As shown in FIG. 15, the plate surfaces of the directional electrical steel sheets constituting the iron core blocks 10410, 10420, 10510, 10520, 12410, 12420, 12510, 12520, 14410, 14420, 14510, 14520 are the X-axis direction and the Z-axis. It is realized by being parallel to the direction (the plate surfaces of the directional electrical steel sheets constituting the iron core blocks 3400, 3500, 6400, 6500, 8401-8403, 8501-8503 are parallel to the X-axis direction and the Y-axis direction. is there).
The rolling direction of the grain-oriented electrical steel sheet inside the hole is parallel to the third direction, for example, iron core blocks 10410, 10420, 10510, 10520, 12410, 12420, 12510, 12520, 14410, This is realized by the rolling direction of the grain-oriented electrical steel sheets constituting 14420, 14510, and 14520 being the X-axis direction.
<Claim 11>
The fact that the hole is a through hole penetrating in the second direction means that a slit 3410, as shown in FIGS. 3 (b), 6 (b), 7 (b), and 8 (b). 3420, 3510, 3520, 7411, 7413, 7421, 7423, 7511, 7513, 7521, 7523, hole groups 6410, 6420, 6510, 6520, holes 7412, 7422, 7512, 7522, gaps 8410, 8420, 8510, 8520 This is realized by being a through hole penetrating in the Z-axis direction.

3000, 6000, 7000, 8000, 10,000, 12000, 14000: Iron core 1100, 1200, 1300: Iron core block constituting the legs 3400, 3500, 6400, 6500, 7400, 7500, 8401-8403, 8501-8503: Yoke Constructing core block 10410, 10420, 10510, 10520, 12410, 12420, 12510, 12520: core block inserted into the hole 3410, 3420, 3510, 3520, 7411, 7413, 7421, 7423, 7511, 7513, 7521, 7523 : Slit 6410, 6420, 6510, 6520: Hole group 7412, 7422, 7512, 7522: Hole 8410, 8420, 8510, 8520: Gap

Claims (11)

A core for a three-phase transformer having a plurality of legs and a yoke for magnetically connecting the two legs located adjacent to each other, and serving as a core for a three-phase transformer,
The plurality of legs are spaced apart from each other;
The extending direction of the plurality of legs is parallel,
The leg and the yoke each have a plurality of laminated directional electrical steel sheets,
The laminating direction of the directional electrical steel sheet constituting the leg and the laminating direction of the directional electrical steel sheet constituting the yoke are the same,
The rolling direction of the grain-oriented electrical steel sheet constituting the leg is parallel to a first direction that is an extending direction of the leg,
The rolling direction of the grain-oriented electrical steel sheet constituting the yoke is a direction perpendicular to the first direction, which is the extending direction of the legs, and the second direction, which is the stacking direction of the grain-oriented electrical steel sheets. Parallel to the third direction,
In a partial region of the yoke, a magnetostriction reducing region including a region having at least a larger magnetoresistance in the first direction than other regions of the yoke,
The length of the magnetostriction reduction region in the third direction is longer than the length of the magnetostriction reduction region in the first direction.   The length in the third direction of the magnetostriction reducing region is the length in the third direction of the grain-oriented electrical steel sheet constituting the yoke, and the center of the magnetostriction reducing region in the first direction. It is 0.4 times or more of the length of the said 3rd direction in the position which passes through, The iron core for three-phase transformers of Claim 1 characterized by the above-mentioned.   The position of the center of the magnetostriction reducing region in the first direction is within a range of 0.1 times or less the length of the yoke in the first direction from the center position of the yoke in the first direction. The load iron core for a three-phase transformer according to claim 1 or 2, wherein the iron core is for the three-phase transformer.   The magnetostriction reduction region is a partial region of the yoke, and is in each of the regions between the centers in the third direction of two legs that are adjacent to each other. Item 4. The core for a three-phase transformer according to any one of Items 1 to 3. Each of the magnetostriction reduction regions has one hole,
5. The three-phase transformer according to claim 1, wherein a length of the magnetostriction reducing region in the third direction is a length of the hole in the third direction. 6. Seki iron core. Each of the magnetostriction reduction regions has a plurality of holes arranged in the third direction,
The length in the third direction of the magnetostriction reducing region is the length in the third direction from the hole at one end to the hole at the other end in the third direction among the plurality of holes. The load iron core for a three-phase transformer according to any one of claims 1 to 4, wherein the iron core is for a three-phase transformer.   The iron core for a three-phase transformer according to claim 5 or 6, wherein the inside of the hole is a space.   The iron core for a three-phase transformer according to claim 5 or 6, wherein a soft magnetic material is present inside the hole. The soft magnetic material is one electromagnetic steel plate or a plurality of laminated magnetic steel plates,
The plate surface of the electromagnetic steel sheet inside the hole is parallel to the third direction and is perpendicular to the plate surface of the directional electromagnetic steel plate constituting the yoke. The iron core for three-phase transformers according to 8. The electrical steel sheet inside the hole is a grain-oriented electrical steel sheet,
The iron core for a three-phase transformer according to claim 9, wherein a rolling direction of the grain-oriented electrical steel sheet inside the hole is parallel to the third direction.   The core for a three-phase transformer according to any one of claims 5 to 10, wherein the hole is a through-hole penetrating in the second direction.

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