JP7003466B2 - Stacked iron core for three-phase transformer - Google Patents

Description

The present invention relates to a product 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 product core formed by laminating electromagnetic steel sheets. When a grain-oriented electrical steel sheet is used as the core, the rolling direction of the grain-oriented electrical steel sheet, the extension (longitudinal) direction of the legs of the iron core, and the extension (longitudinal) direction of the yoke (the extension direction of the legs and the lamination of the electrical steel sheet). (Direction perpendicular to the direction) should be the same. This is because the grain-oriented electrical steel sheet has a large magnetic anisotropy and its magnetic permeability in the rolling direction is large (compared to the magnetic 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-shaped hole extending in a direction substantially orthogonal to a magnetic path formed when a transformer is excited is formed in an iron core.

Jitsukaihei No. 5-50713 Gazette

By the way, it is desired to reduce the vibration noise (so-called beat) of the iron core generated when the transformer is operated. However, in the technique described in Patent Document 1, the hole formed in the iron core causes a rapid increase in the exciting current by locally saturate the iron core before the entire iron core reaches saturation (before the magnetic flux density reaches the saturated magnetic flux density). It is for mitigation. Therefore, it is not easy to reduce the noise of the iron core. In particular, in a three-phase transformer, since the phases of the voltages of each phase are shifted by 120 °, vibration noise of the iron core is likely to be generated, and there is a high need for noise reduction of the iron core as compared with a single-phase transformer.

The present invention has been made in view of the above problems, and an object of the present invention is to reduce noise due to vibration of a steel core used in a three-phase transformer.

The product core for a three-phase transformer of the present invention has a plurality of legs and a yoke that magnetically connects two of the two legs located adjacent to each other, and serves as the core of the three-phase transformer. A steel core for a transformer, wherein the plurality of legs are spaced from each other, the extending directions of the plurality of legs are parallel, and the legs and the yoke are each laminated in a plurality of directions. The graining direction of the grain-oriented electrical steel sheets having the grain-oriented electrical steel sheets and constituting the legs is the same as the stacking direction of the grain-oriented electrical steel sheets constituting the yoke, and the grain-oriented electrical steel sheets constituting the legs are the same. The rolling direction of the grain is parallel to the first direction which is the extension direction of the leg, and the rolling direction of the grain-oriented electrical steel sheet constituting the yoke is the first direction which is the extension direction of the leg. And parallel to the third direction, which is the direction perpendicular to the second direction, which is the stacking direction of the grain-oriented electrical steel sheets, and in a part of the yoke, at least more than the other regions of the yoke. It has a magnetic strain reduction region including a region having a large magnetic resistance in the first direction, and the length of the magnetic strain reduction region in the third direction is longer than the length of the magnetic strain reduction region in the first direction. There is a hole in the magnetic strain reduction region, and there is one electrical steel sheet or a plurality of laminated electrical steel sheets inside the hole, and the plate surface of the electrical steel sheet inside the hole is: A single electrical steel sheet or a plurality of laminated electrical steel sheets that are parallel to the third direction and perpendicular to the plate surface of the grain-oriented electrical steel sheet constituting the yoke and inside the hole. The size of the electrical steel sheet is the same as or smaller than the hole, and the position of the center of the magnetic strain reduction region in the first direction is from the position of the center of the yoke in the first direction. It is characterized in that it is located within a range of 0.1 times or less the length of the yoke in the first direction .

According to the present invention, it is possible to reduce the noise caused by the vibration of the steel core used in the three-phase transformer.

It is a figure which shows the general structure of the iron core. It is a figure which shows an example of the relationship between magnetostriction and an angle from a rolling direction of an exciting direction. It is a figure which shows an example of the structure of the stacked iron core of 1st Embodiment. It is a figure explaining an example of the region which forms a slit. It is a figure which conceptually shows an example of the magnetic flux lines generated in the product core of 1st Embodiment. It is a figure which shows an example of the structure of the stacked iron core of the 2nd Embodiment. It is a figure which shows the modification of the structure of the steel core of the 1st and 2nd embodiments. It is a figure which shows an example of the structure of the stacked iron core of the 3rd Embodiment. It is a figure which shows an example of the relationship between the maximum magnetic flux density and magnetostriction. It is a figure which shows an example of the structure of the stacked iron core of 4th Embodiment. FIG. 10 (a) is an enlarged view showing a portion of the iron core block. It is a figure which shows an example of the structure of the stacked iron core of the 5th Embodiment. FIG. 12 (a) is an enlarged view showing a portion of the iron core block. It is a figure which shows an example of the structure of the stacked iron core of 6th Embodiment. FIG. 14 (a) is an enlarged view showing a portion of the iron core block. It is a figure which shows the modification of the 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 product core 1000 for a three-phase transformer. In the following description, the steel core for a three-phase transformer will be abbreviated as a steel core as necessary. 1 (a) shows a plan view of a stacked iron core, and FIG. 1 (b) shows a cross-sectional view taken along the line II of FIG. 1 (a). In each figure, the X-axis, the Y-axis, and the Z-axis are views showing the relationship between the orientations of the respective figures. Those marked with ● in ○ indicate the direction from the back side to the front side of the paper, and those marked with × in ○ indicate the direction from the front side to the back side of the paper. show.

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

The iron core blocks 1100, 1200, and 1300 are parts constituting the legs of the stacked iron core 1000. The iron core blocks 1100 and 1300 have the same shape and size. The planar shape of the iron core blocks 1100 and 1300 is an isosceles trapezoid. The length of the upper base or the lower base of this isosceles trapezoid corresponds to the length in the Y-axis direction (extended (longitudinal) direction of the legs) of the legs of the steel core 1000. The iron core block 1200 is configured by laminating grain-oriented electrical steel sheets having a hexagonal plane shape in which one set of sides facing each other is longer than the other set of sides. As shown in FIG. 1 (a), among the sides of this hexagon, the length of a set of sides (two sides) longer than the other sides is equal, and the length of this side is the iron core block. It is equal to the length of the shorter side of the upper and lower bases of the isosceles trapezoidal shape of 1100 and 1300. In FIG. 1A, the case where the lengths of the other sides (four sides) are also the same is shown as an example, but the lengths of the other sides (four sides) do not have to be the same.

The iron core blocks 1400 and 1500 are parts constituting the yoke (joint iron) of the stacked iron core 1000, and are for magnetically connecting the iron core blocks 1100, 1200 and 1300. The iron core blocks 1400 and 1500 have the same shape and size. The iron core blocks 1400 and 1500 are laminated with a directional electromagnetic steel plate having a flat shape in which the central portion of the shorter side of the upper and lower bases of the isosceles trapezoid is recessed with respect to the isosceles trapezoid. It is composed by letting. The shape of this recessed part is at the (one) end point where two adjacent short sides of the hexagon, which is the planar shape of the iron core block 1200, overlap each other, and the two short sides are separated from each other. It is a triangular shape with certain (two) endpoints as vertices. The length of the upper bottom or lower bottom of such an equal leg trapezoid is the X-axis direction (longitudinal direction (extending direction of the leg (Y-axis direction)) of the yoke of the steel core 1000 and the laminating direction (Z) of the directional electromagnetic steel plate. Corresponds to the length (in the direction perpendicular to the axial direction).

Here, the rolling direction (direction of the easy axis of magnetization) is the direction of the double-headed arrow line shown beside the RD of FIG. 1 (a), and the planar shape is each iron core block 1100, 1200, 1300, 1400, 1500. By shearing or punching the directional electromagnetic steel plate so as to have the same planar shape as the above, the directional electromagnetic steel plate constituting each iron core block 1100, 1200, 1300, 1400, 1500 can be obtained. By laminating and fixing such grain-oriented electrical steel sheets so as to match their contours, core blocks 1100, 1200, 1300, 1400 and 1500 can be obtained. Then, by combining the iron core blocks 1100, 1200, 1300, 1400, and 1500 as shown in FIGS. 1 (a) and 1 (b), a stacked iron core 1000 is obtained.

The product core 1000 is an inner iron type product core. When a three-phase transformer is configured using the iron core 1000, coils are arranged for each of the three legs (iron core blocks 1100, 1200, 1300) of the iron core 1000. The coils arranged on each leg correspond to, for example, the coils of each phase of the three-phase AC power supply. In FIG. 1A, when an AC voltage of a three-phase AC power supply is applied to a coil (not shown) arranged for the iron core blocks 1100, 1200, and 1300, the excitation period (the frequency of the three-phase AC power supply) is shown. An example of a magnetic flux line generated inside the core 1000 is conceptually shown at a certain point in time (corresponding period) (for example, when the amplitudes of the U-phase and V-phase voltages are equal and the polarities are also equal).

As shown in FIG. 1A, the magnetic flux flows in the regions 1600 and 1700 in directions other than the rolling direction (RD) of the grain-oriented electrical steel sheet. In this way, when the AC voltage of the three-phase AC power supply is applied, the center of the core block 1200 in the X-axis direction and the center of the core block 1300 in the X-axis direction in the region of the core block 1400 and 1500 (that is, the yoke). In the region between and, the magnetic flux flows in a direction other than the rolling direction of the directional electromagnetic steel plate.

Although not shown here, when an AC voltage of a three-phase AC power supply is applied to a coil (not shown) arranged for the iron core blocks 1100, 1200, and 1300, the excitation period (three-phase AC power supply). At a certain point in time (a period corresponding to the frequency) (for example, when the voltage amplitudes of the V phase and the W phase are equal and the polarities are also equal), the iron core in the region of the iron core blocks 1400 and 1500 (that is, the yoke). In the 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, magnetic flux flows in a direction other than the rolling direction of the directional electromagnetic steel plate. The magnetic flux line in this case generally passes the magnetic flux line shown in FIG. 1 (a) through the position of the center of gravity (the portion shown in FIG. 1 (a)) of the iron core block 1200 in the Y-axis direction (stacked core 1000). It is rotated 180 ° around the axis extending in the extension (longitudinal) direction of the legs.

FIG. 2 is a diagram showing an example of the relationship between the magnetostriction in the grain-oriented electrical steel sheet and the angle of the excitation direction (direction of the magnetic flux line) from the rolling direction. Note that FIG. 2 shows the relationship when the maximum magnetic flux density Bm is 1.0T. As shown in FIG. 2, the larger the angle of the exciting direction from the rolling direction, the larger the magnetostriction of the grain-oriented electrical steel sheet. In the example shown in FIG. 2, when the angle of the exciting 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 °. The grain-oriented electrical steel sheet constituting the core 1000 is fixed, but it is not fixed so as not to move completely. Due to such magnetostriction, the grain-oriented electrical steel sheet constituting the core 1000 vibrates, which causes noise. Become.

Therefore, the present inventors reduce the magnetic flux flowing in a direction other than the rolling direction of the directional electromagnetic steel plate, such as that generated in the regions 1600 and 1700 of FIG. 1A, to reduce the noise generated from the steel core. I thought it could be reduced. The following embodiments of the present invention are based on such findings. Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same parts as the product core 1000 shown in FIG. 1 are designated by the same reference numerals as those given in FIG. 1, and detailed description thereof will be omitted.

(First Embodiment)
First, the first embodiment of the present invention will be described.
FIG. 3 is a diagram showing an example of the configuration of the stacked iron core 3000 of the present embodiment. 3A shows a plan view of the steel core 3000, and FIG. 3B shows a cross-sectional view taken along the line II of FIG. 3A. ..
In FIGS. 3 (a) and 3 (b), the product core 3000 is configured by laminating a plurality of grain-oriented electrical steel sheets.
The stacked iron core 3000 has an iron core block 1100, 1200, 1300, 3400, and 3500.

The iron core blocks 3400 and 3500 are parts constituting the yoke (joint iron) of the stacked iron core 3000. The shape and size 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 core blocks 3400 and 3500 are different from the core blocks 1400 and 1500 shown in FIG. 1 in this respect, and are the same as the core blocks 1400 and 1500 shown in FIG. 1 in other points.

As described with reference to FIG. 1A, the magnetic flux flowing in a direction other than the rolling direction of the directional electromagnetic steel plate in a plane parallel to the plate surface of the directional electromagnetic steel plate is the iron core block 1400, 1500 (that is, that is, Of the regions of the yoke), the regions flow between the regions between the centers of the core blocks 1200 and 1300 in the X-axis direction (regions 1600 and 1700) and the regions between the centers of the core blocks 1100 and 1200 in the X-axis direction. Further, 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 of the iron core blocks 1400 and 1500 (that is, the yoke) in the Y-axis direction and is X-axis. The distribution is axisymmetric with the axis extending in the direction as the axis.

Therefore, in the region parallel to the plate surface of the directional electromagnetic steel plate, in the region where the magnetic flux flowing in the direction other than the rolling direction of the directional electromagnetic steel plate is generated (regions 1600 and 1700 in the example shown in FIG. 1A), The magnetic resistance of the directional electromagnetic steel plate in the region near the center in the Y-axis direction of the iron core blocks 1400 and 1500 is increased in a direction other than the rolling direction (this does not reject the change in the magnetic resistance in the rolling direction. That is, for example, it is allowed that the magnetic resistance in the rolling direction also increases at the same time). By doing so, the magnetic flux flowing in the direction other than the rolling direction of the grain-oriented electrical steel sheet is reduced.

Therefore, in the present embodiment, in the region of the iron core block 3400 (that is, the yoke), the 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. 3410, 3420 slits (holes) 3410, 3420 extending in the X-axis direction in the region between the region of the iron core block 1200 and the center of the iron core block 1200 and 1300 in the X-axis direction and near the center of the iron core block 3400 in the Y-axis direction. To form.

Similarly, in the region of the core block 3500 (that is, the yoke), the region between the centers of the core blocks 1100 and 1200 in the X-axis direction, the region near the center of the 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 a region between the centers of the blocks 1200 and 1300 in the X-axis direction and near 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 (rolling direction of the directional electromagnetic steel plate constituting the iron core block 3400, 3500) is the iron core block 3400 constituting the yoke (joint iron) of the steel core block 3000. It is desirable that the length of 3500 in the X-axis direction is 0.4 times or more the length D3 in the X-axis direction at a position passing through the center of the slits 3410, 3420 or 3510, 3520 in the Y-axis direction. If the length D1 of the slits 3410, 3420, 3510, and 3520 in the X-axis direction falls below this range, the magnetic fluxes 1600 and 1700 shown in FIG. 1A may increase and the effect of reducing vibration noise may decrease. Because.

On the other hand, the length D2 of the slits 3410, 3420, 3510, and 3520 in the Y-axis direction is within the range of the length D1 in the X-axis direction, depending on the specifications of the three-phase transformer configured by using the steel core 3000. It may be decided as appropriate. For example, the length D2 of the slits 3410, 3420, 3510, and 3520 in the Y-axis direction can be set within a range of 2 mm or more and 30 mm or less. If the length D2 of the slits 3410, 3420, 3510, and 3520 in the Y-axis direction falls below this range, the magnetic flux penetrating the slits 3410, 3420, 3510, and 3520 increases, and the effect of reducing vibration noise may decrease. There is. On the other hand, when the length D2 of the slits 3410, 3420, 3510, and 3520 in the Y-axis direction exceeds this range, the effect of reducing the vibration noise is due to the increase in the maximum magnetic flux density Bm due to the decrease in the cross-sectional area of the iron core blocks 1400 and 1500. May decrease. The Y-axis direction is the rolling direction of the grain-oriented electrical steel sheets constituting the iron core blocks 3400 and 3500 (X-axis direction) and the stacking direction of the grain-oriented electrical steel sheets constituting the core blocks 3400 and 3500 (Z-axis direction). It is in the vertical direction.
Further, the slits 3410, 3420, 3510, and 3520 are through holes penetrating in the Z-axis direction (see FIG. 3B).

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

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

Further, 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. 1 (a), the reluctance in the region near the center of the core block 3400 and 3500 in the Y-axis direction in a direction other than the rolling direction of the grain-oriented electrical steel sheet is measured by the other of the core block 3400. This is because it is necessary to make it larger than the magnetic resistance in the region of.

Here, the region near the center of the iron core block 3400 in the Y-axis direction means that the distance in the Y-axis direction from the position of the center of the iron core block 3400 (yoke) in the Y-axis direction is the Y-axis of the iron core block 3400 (yoke). Refers to 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 the 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 from the virtual line 4600a in the Y-axis direction is 0.1 times the length D4 in the Y-axis direction of the iron core block 3400. .. 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 virtual line 4500a is located on the opposite side of the virtual line 4400a at a position where the distance from the virtual line 4600a in the Y-axis direction is 0.1 times the length D4 in the Y-axis direction of the iron core block 3400 in the X-axis direction. It is a virtual line extending to.

Similarly, the slit 3510 is formed in the region of the core block 3500 between the centers of the core blocks 1100 and 1200 in the width direction. That is, in FIG. 4, the slit 3510 is formed in the region between the virtual lines 4100 and 4200.
Further, the slit 3520 is formed in the region between the centers of the iron core blocks 1200 and 1300 in the width direction in the region of the iron core block 3500. That is, in FIG. 4, the slit 3520 is formed in the region between the virtual lines 4200 and 4300.
Further, 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 region near the center of the iron core block 3500 in the Y-axis direction is defined in the same manner as the iron core block 3400. That is, in the region near the center of the iron core block 3500 in the Y-axis direction, the distance in the Y-axis direction from the position of the center in the Y-axis direction of the iron core block 3500 is 0. Refers to the area within the range of 1 times 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 from the virtual line 4600b in the Y-axis direction is 0.1 times the length D4 in the Y-axis direction of the iron core block 3500. .. 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 virtual line 4500b is located on the opposite side of the virtual line 4400b at a position where the distance from the virtual line 4600b in the Y-axis direction is 0.1 times the length D4 in the Y-axis direction of the iron core block 3500 in the X-axis direction. It is a virtual line extending to.

Slit-shaped holes are 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-shaped 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 planar shape, size, and position in the XY plane of the holes formed in each grain-oriented electrical steel sheet constituting the iron core block 3400 are determined by the planar shape, size, and XY of the slits 3410 and 3420, respectively. It is a position on a plane. Similarly, the planar shape, size, and position in the XY plane of the holes formed in each grain-oriented electrical steel sheet constituting the iron core block 3500 are determined by the planar shape, size, and X- of the slits 3510 and 3520, respectively. It is a position on the Y plane.
In the present embodiment, the shape, size, and position of the holes formed in the grain-oriented electrical steel sheets constituting the iron core blocks 3400 and 3500 are the same.

The rolling direction (direction of the easy axis of magnetization) is the direction of the double-headed 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. By shearing or punching the sex electromagnetic steel plate with a mold, a directional electromagnetic steel plate constituting the iron core blocks 3400 and 3500 can be obtained.

By laminating and fixing the grain-oriented electrical steel sheets thus obtained so as to match their contours, the iron core blocks 3400 and 3500 can be obtained. As described above, the shape, size, and position of the holes formed in the grain-oriented electrical steel sheets constituting the iron core blocks 3400 and 3500 are the same. Therefore, when these grain-oriented electrical steel sheets are laminated to each other, the holes formed in the grain-oriented electrical steel sheets penetrate the iron core blocks 3400 and 3500 in the Z-axis direction, which is the stacking direction of 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, and 3520 (see FIG. 3B).

As described above, in the present embodiment, the slits 3410, 3420, which extend in the X-axis direction (rolling direction of the directional electromagnetic steel plate) near the center of the iron core blocks 3400 and 3500 constituting the yoke of the stacked iron core 3000 in the Y-axis direction. Form 3510, 3520. Therefore, in the yoke of the stacked iron core 3000 composed of the iron core blocks 3400 and 3500, the reluctance in a direction other than the rolling direction (X-axis direction) of the directional electromagnetic steel plate constituting the iron core blocks 3400 and 3500 is applied (slits 3410 and 3420). , 3510, 3520 can be made larger (which does not reject changes in magnetoresistance in the X-axis direction (ie, all of the regions forming slits 3410, 3420, 3510, 3520). In the above, it is sufficient that the magnetic resistance in the Y-axis direction is at least larger than that in the other regions of the yoke, and for example, it is allowed that the magnetic resistance in the X-axis direction is also increased in the magnetic strain reduction region at the same time). Therefore, the magnetic flux line shown in FIG. 1A changes 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). As a result, it is possible to suppress an increase in the angle of the exciting direction (direction of the magnetic flux line) from the rolling direction, and it is possible to reduce the magnetostriction generated in the steel core 3000 (see FIG. 2).

In the present embodiment, the case where the shape, size, and position 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. By doing so, it 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 core blocks 3400 and 3500 may be different. Further, in the present embodiment, the case where the slits 3410 and 3420 are formed as through holes penetrating in the Z-axis direction has been described as an example. However, the direction through which the slit penetrates may not be the Z-axis direction but a direction inclined with respect to the Z-axis direction. Further, the slit does not have to be a through hole.

(Second embodiment)
Next, a second embodiment of the present invention will be described. In the first embodiment, slits 3410, 3420, 3510, and 3520 extending in the X-axis direction are formed in a region near the center of the iron core blocks 3400 and 3500 constituting the yoke of the stacked iron core 3000, respectively. The case of doing this was explained as an example. On the other hand, in the present embodiment, a plurality of holes arranged in the X-axis direction are formed in the region forming the slits 3410, 3420, 3510, and 3520. As described above, the shape, size, and number of holes formed in the iron core block constituting the yoke of the steel core 3000 are mainly different from the present embodiment and the first embodiment. Therefore, in the description of the present embodiment, detailed description of the same parts as those described above will be omitted by adding the same reference numerals as those given in FIGS. 1 to 5.

FIG. 6 is a diagram showing an example of the configuration of the stacked iron core 6000 of the present embodiment. FIG. 6A shows a plan view of the steel core 6000, and FIG. 6B shows a cross-sectional view taken along the line II of FIG. 6A. ..
In FIGS. 6 (a) and 6 (b), the product core 6000 is configured by laminating a plurality of grain-oriented electrical steel sheets.
The stacked iron core 6000 has an iron core block 1100, 1200, 1300, 6400, 6500.

The iron core blocks 6400 and 6500 are parts constituting the yoke (joint iron) of the stacked iron core 6000. The iron core blocks 6400 and 6500 have the same shape and size. The core blocks 6400 and 6500 are in the X-axis direction (rolling direction of the grain-oriented electrical steel sheets constituting the core blocks 6400 and 6500) in the region where the slits 3410, 3420, 3510 and 3520 described in the first embodiment are formed. It forms multiple holes lined up in. 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 the region of the iron core block 3400 surrounded by the virtual lines 4100, 4200, 4400a, 4500a in FIG. Further, in the region of the iron core block 3400, the slit 3420 is formed in the region surrounded by the virtual lines 4200, 4300, 4400a and 4500a in FIG. The length of these slits 3410 and 3420 in the X-axis direction is D1, and the length in the Y-axis direction is D2.

In the present embodiment, it is a region inside such a region (a 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, 6420) arranged in the X-axis direction are formed in a region having an axial length of D2. At this time, as shown in FIG. 6A, one end of the hole groups 6410 and 6420 in the X-axis direction (the end on the negative direction side of the X-axis) (the end on the negative direction of the X-axis) side. The length in the X-axis direction (that is, the end of the other end (the end on the positive direction of the X-axis)) from the other end (the end on the positive direction of the X-axis) to the hole (the end of the other end (the end on the positive direction of the X-axis)). The longest distance in the direction) is set to D1.

Similarly, in the first embodiment, the slit 3510 is formed in the region of the iron core block 3500 surrounded by the virtual lines 4100, 4200, 4400b, and 4500b in FIG. Further, in the region of the iron core block 3500, the slit 3520 is formed in the region surrounded by the virtual lines 4200, 4300, 4400b and 4500b of FIG. The lengths of these slits 3510 and 3520 in the X-axis direction are D1, and the lengths in the Y-axis direction are D2.

In the present embodiment, the region inside such a region in the iron core block 6500 is arranged in the X-axis direction within the region where 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, 6520) are formed. At this time, as shown in FIG. 6A, one end of the hole groups 6510 and 6520 in the X-axis direction (the end on the negative direction side of the X-axis) (the end on the negative direction of the X-axis) side. The length in the X-axis direction (that is, the end of the other end (the end on the positive direction of the X-axis)) from the other end (the end on the positive direction of the X-axis) to the hole (the end of the other end (the end on the positive direction of the X-axis)). The longest distance in the direction) is set to D1.
It should be noted in the first embodiment that the length D1 is preferably 0.4 times or more the length D3 and the length D2 is preferably within the range of 2 mm or more and 30 mm or less. It's the same as I did.
The shapes and sizes of the holes constituting the hole groups 6410, 6420, 6510, and 6520 are the same, and the intervals between the holes constituting the hole groups 6410, 6420, 6510, and 6520 are the same. In the example shown in FIG. 6A, the planar shape of each hole constituting the hole groups 6410 and 6510 is a circle, and the diameter of the hole is D2. The planar shape of each hole constituting the hole groups 6410 and 6510 may be a shape other than a circle (for example, an ellipse, a square, or a rectangle). Further, the holes constituting the hole groups 6410, 6420, 6510, 6520 are through holes penetrating in the Z-axis direction (see FIG. 6B).

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 the grain-oriented electrical steel sheets constituting the iron core blocks 6400 and 6500 are the same.

The rolling direction (direction of the easy axis of magnetization) is the direction of the double-headed 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. By shearing or punching the sex electromagnetic steel plate with a mold, the directional electromagnetic steel plate constituting the iron core blocks 6400 and 6500 can be obtained.

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

As described above, in the present embodiment, 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 of the core blocks 6400 and 6500 constituting the yoke of the core 6000. Hole groups 6410, 6420, 6510, 6520 are formed, and in a part of the region (the region where the holes are formed), the magnetic resistance in at least the Y-axis direction is increased as compared with the other regions of the yoke. Even in this way, the same effect as described in the first embodiment can be obtained.

Also in the present embodiment, as described in the first embodiment, 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 6400 and 6500. May be different. Further, the direction through which the holes formed in the iron core blocks 6400 and 6500 penetrate may not be the Z-axis direction but the direction inclined with respect to the Z-axis direction. Further, these holes do not have to be through holes.

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

FIG. 7 is a diagram showing an example of the configuration of the product core 7000 of this modified example. 7 (a) shows a plan view of the steel core 7000, and FIG. 7 (b) shows a cross-sectional view taken along the line II of FIG. 7 (a). ..
In FIGS. 7 (a) and 7 (b), the product core 7000 is configured by laminating a plurality of grain-oriented electrical steel sheets.
The stacked iron core 7000 has an iron core block 1100, 1200, 1300, 7400, and 7500.

The iron core blocks 7400 and 7500 are parts constituting the yoke (joint iron) of the stacked iron core 7000. The shapes and sizes of the iron core blocks 7400 and 7500 are the same. The iron core blocks 7400 and 7500 are X than the regions where the slits 3410, 3420, 3510 and 3520 described in the first embodiment and the hole groups 6410, 6420, 6510 and 6520 described in the second embodiment are formed. Two slits are placed between each of the areas where the length in the axial direction (rolling direction of the directional electromagnetic steel plates constituting the iron core blocks 7400 and 7500) is long and the length in the Y-axis direction is the same. The slits and holes are arranged side by side in the X-axis direction. Other points of the iron core blocks 7400 and 7500 are the same as those of 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 the slit 7411, the hole 7412, and the slit 7413 are formed, a region in which the slit 7421, the hole 7422, and the slit 7423 are formed, and the slit 7511. , The area where the hole 7512 and the slit 7513 are formed, and the area where the slit 7521, the hole 7522 and the slit 7523 are formed. The slits 7411, 7413, 7421, 7423, 7511, 7513, 7521, 7523 are slits extending in the X-axis direction. In the example shown in FIG. 7A, the planar shape of each hole constituting the hole 7412, 7422, 7512, 7522 is a circle, and the diameter of the hole and the slit 7411, 7413, 7421, 7423, 7511, 7513, 7521 , The length of 7523 in the Y-axis direction is D2. This length D2 is the length of the above-mentioned four regions in the Y-axis direction. Further, as shown in FIG. 7A, the length of the above-mentioned four regions in the X-axis direction is defined as D1. It should be noted in the first embodiment that the length D1 is preferably 0.4 times or more the length D3 and the length D2 is preferably within the range of 2 mm or more and 30 mm or less. It's the same as I did.

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. Further, 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 they penetrate may not be the Z-axis direction but a direction inclined with respect to the Z-axis direction. Also, these do not have to be through holes. Even if the lengths of the slits 7411, 7413, 7421, 7423, 7511, 7513, 7521, and 7523 in the Y-axis direction and the diameters of the holes 7412, 7422, 7512, and 7522 (for example, diameter and minor axis) are different. good. Further, the number of slits and holes formed in each region is not limited to the number shown in FIGS. 7 (a) and 7 (b) 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, there are cases where slits and holes are formed inside the core blocks 3400, 3500, 6400, 6500, 7400, 7500 constituting the yokes of the cores 3000, 6000, and 7000. It was explained by giving 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. As described above, 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 stacked iron core. Therefore, in the description of the present embodiment, detailed description of the same parts as those described above will be omitted by adding the same reference numerals as those given in FIGS. 1 to 7.

FIG. 8 is a diagram showing an example of the configuration of the stacked iron core 8000 of the present embodiment. 8 (a) shows a plan view of the iron core 8000, and FIG. 8 (b) shows a cross-sectional view taken along the line II of FIG. 8 (a). ..
In FIGS. 8 (a) and 8 (b), the product core 8000 is configured by laminating a plurality of grain-oriented electrical steel sheets.
The stacked iron core 8000 has an iron core block 1100, 1200, 1300, 8401, 8402, 8403, 8501, 8502, 8503.
The iron core blocks 8401, 8402, and 8403 are parts constituting the yoke (joint iron) of the stacked iron core 8000. The iron core blocks 8501, 8502, and 8503 are also parts constituting the yoke (joint iron) of the stacked iron core 8000. The iron core blocks 8401 and 8501 have the same shape and size. Further, the iron core blocks 8402, 8403, 8502, 8503 have the same shape and size.

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

Here, the rolling direction (direction of the easy axis of magnetization) is the direction of the double-headed arrow line shown beside the RD in FIG. 8A, and the planar shape is the same as the planar shape of the iron core blocks 8401 and 8501. By shearing or punching the directional electromagnetic steel plate with a die as described above, the directional electromagnetic steel plate constituting each of the iron core blocks 8401 and 8501 can be obtained. By laminating and fixing such grain-oriented electrical steel sheets so as to match their contours, the respective iron core blocks 8401 and 8501 can be obtained.

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

Here, the rolling direction (direction of the easy axis of magnetization) is the direction of the double-headed arrow line shown beside the RD of FIG. 8A, and the plane shape is the plane of each iron core block 8402, 8403, 8502, 8503. By shearing or punching the directional electromagnetic steel plate so as to have the same shape as the shape, the directional electromagnetic steel plate constituting each iron core block 8402, 8403, 8502, 8503 can be obtained. By laminating and fixing such grain-oriented electrical steel sheets so as to match their contours, the respective iron core blocks 8402, 8403, 8502, 8503 can be obtained.

The shorter side of the upper and lower bases of the isotropic trapezoid that constitutes the planar shape of the iron core block 8401, and the upper and lower bases of the isotropic trapezoid that constitutes the planar shape of the iron core blocks 8402 and 8403. Arrange and fix them so that the longer sides are spaced apart from each other and face each other. Similarly, the shorter side of the upper and lower bases of the isosceles trapezoid that constitutes the planar shape of the iron core block 8501, and the upper and lower bases of the isosceles trapezoid that constitutes the planar shape of the iron core blocks 8502 and 8503. Arrange and fix them so that the longer side faces each other with a gap. As described above, gaps 8410, 8420, 8510 and 8520 are formed between the iron core block 8401 and the iron core blocks 8402 and 8403, and between the iron core block 8501 and the iron core blocks 8502 and 8503, respectively. These gaps 8410, 8420, 8510, and 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 as to form the gaps 8410 and 8420 as described above, their outer shapes and sizes are 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 as to form the gaps 8510, 8520 as described above, the outer shape and the size thereof are the same as in the first embodiment and the second embodiment. It should be the same as the outer shape and size of the iron core blocks 3500, 6500, and 7500 described.

In the first embodiment and the second embodiment, slits extending in the X-axis direction and holes arranged in the X-axis direction are formed in a part of the region near the center of the yokes of the cores 3000, 6000, and 7000 in the Y-axis direction. Is formed. On the other hand, in the present embodiment, gaps 8410, 8420, 8510, and 8520 extending in the X-axis direction are formed in the entire region near the center of the yoke of the steel core 8000 in the Y-axis direction. As described above, in the present embodiment, the lengths of the gaps 8410 and 8420 in the X-axis direction are D1, and the lengths in the Y-axis direction are D2. It is desirable that the length D2 is within the range of 2 mm or more and 30 mm or less, which is the same 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 the present embodiment, gaps 8410, 8420, 8510, and 8520 extending in the X-axis direction are formed in the entire vicinity of the center of the yoke of the steel core 8000 in the Y-axis direction. Even in this way, the same effect as described in the first embodiment can be obtained. However, as compared with the first embodiment and the second embodiment, the number of iron core blocks constituting the yoke increases, and the workload for constituting the yoke increases. Therefore, from the viewpoint of the workload, the third embodiment. The first embodiment and the second embodiment are preferable to the embodiment.
A non-magnetic and non-conductive member may be inserted (arranged) in the gaps 8410, 8420, 8510, and 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 core block 3400, 3500, 6400, 6500, 7400, 7500, 8401 to 8403, 8501 to 8503) are formed. , 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 where it is a space (a state in which nothing is inserted) has been described as an example. In this way, the distribution of the magnetic fluxes of the cores 3000, 6000, 7000, and 8000 can be changed so that the magnetostriction is reduced.

However, the holes formed in the core blocks 3400, 3500, 6400, 6500, 7400, 7500, 8401-8403, 8501-8503 reduce the area of the cross section 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 to 8403, and 8501 to 8503 becomes large. FIG. 9 is a diagram showing an example of the relationship between the maximum magnetic flux density and magnetostriction in a grain-oriented electrical steel sheet. As shown in FIG. 9, the magnetostriction also increases as the maximum magnetic flux density increases. Therefore, it is preferable to reduce the magnetostriction caused by this. Therefore, in the present embodiment, the case where the soft magnetic material is inserted into the slits 3410, 3420, 3510, and 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, detailed description of the same parts as those described above will be omitted by adding the same reference numerals as those given in FIGS. 1 to 5.

FIG. 10 is a diagram showing an example of the configuration of the stacked iron core 10000 of the present embodiment. 10 (a) shows a plan view of the iron core 10000, and FIG. 10 (b) shows a cross-sectional view taken along the line II of FIG. 10 (a). .. In this 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 stacked iron core 10000 has an iron core block 1100, 1200, 1300, 3400, 3500, 10410, 10420, 10510, 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, and 10520 are configured by laminating grain-oriented electrical steel sheets. The shape and size of the core blocks 10410, 10420, 10510 and 10520 are the same as the shape and size of the space inside the slits 3410, 3420, 3510 and 3520 of the core blocks 3400 and 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, and 10520 can be easily inserted into the slits 3410, 3420, 3510, and 3520 of the iron core blocks 3400 and 3500.

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

Further, also inside the slit 3410, the maximum magnetic flux density Bm of the stacked iron core 10000 is reduced by reducing the magnetic resistance in the X-axis direction as in the iron core block 3400. Therefore, the rolling direction of the grain-oriented electrical steel sheet constituting the iron core block 10410 is set to the X-axis direction (that is, the rolling direction of the grain-oriented electrical steel sheet constituting the core block 3400). This also applies to the iron core blocks 10420, 10510, 10520.

By shearing or punching the grain-oriented electrical steel sheets so that the core blocks 10410, 10420, 10510, 10520 as described above are formed, the grain-oriented electrical steel sheets constituting the core blocks 10410, 10420, 10510, 10520 are formed. Is obtained. Each iron core block 10410 is fixed by laminating and fixing such grain-oriented electrical steel sheets so as to match the internal shapes of the slits 3410, 3420, 3510, and 3520 and to have the same rolling direction. , 10420, 10510, 10520 are obtained.

As described above, in the present embodiment, a plurality of grain-oriented electrical steel sheets (iron core block 10410) are provided inside the slits 3410, 3420, 3510, and 3520 so that the rolling direction is the X-axis direction and the stacking direction is the Y-axis direction, respectively. , 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 steel core 10000 can be suppressed from increasing by forming the slits 3410, 3420, 3510, and 3520 can be obtained. ..

In the present embodiment, the case where a plurality of grain-oriented electrical steel sheets are laminated to form the iron core blocks 10410, 10420, 10510, and 10520 has been described as an example. However, the number of grain-oriented electrical steel sheets inserted inside the slits 3410, 3420, 3510, and 3520 may be one. In this case as well, as described above, the plate surface of the grain-oriented electrical steel sheet is parallel to the X-axis direction and perpendicular to the plate surface of the grain-oriented electrical steel sheet constituting the iron core blocks 3400 and 3500. do.

Further, in the present embodiment, the case where the grain-oriented electrical steel sheet is used has been 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, non-oriented electrical steel sheets may be used instead of the grain-oriented electrical steel sheets. In this case as well, as described above, the plate surface of the non-oriented electrical steel sheet is parallel to the X-axis direction and perpendicular to the plate surface of the grain-oriented electrical steel sheet constituting the iron core blocks 3400 and 3500. To.

Further, what is inserted into the slits 3410, 3420, 3510, and 3520 does not necessarily have to be plate-shaped as long as it is a soft magnetic material. However, the inside of the slits 3410, 3420, 3510, 3520 is soft so that the magnetic resistance in the Y-axis direction in the slits 3410, 3420, 3510, and 3520 is larger than the magnetic resistance in the Y-axis direction in the iron core blocks 3400 and 3500. Insert the magnetic material. If a soft magnetic material is inserted inside the slits 3410, 3420, 3510, 3520, the magnetic resistance in the X-axis direction inside the slits 3410, 3420, 3510, 3520 becomes the inside of the slits 3410, 3420, 3510, 3520. Is smaller than when is a space (nothing is inserted). Therefore, it is possible to obtain the effect of suppressing an increase in the maximum magnetic flux density of the iron core without considering the magnetoresistance of the soft magnetic material inserted inside the slits 3410, 3420, 3510, and 3520 in the X-axis direction (slit 3410). As described above, it is preferable to reduce the magnetic resistance of the soft magnetic material inserted inside the 3420, 3510, and 3520 in the X-axis direction as much as possible).

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

(Fifth Embodiment)
Next, a fifth embodiment of the present invention will be described. In the present embodiment, the case where the 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 product core of the present embodiment is obtained by inserting a soft magnetic material into the holes constituting the hole groups 6410, 6420, 6510, 6520 with respect to the product core 6000 of the second embodiment. Therefore, in the description of the present embodiment, detailed description of the same parts as those described above will be omitted by adding the same reference numerals as those given in FIGS. 1 to 11.

FIG. 12 is a diagram showing an example of the configuration of the stacked iron core 12000 of the present embodiment. 12 (a) shows a plan view of the iron core 12000, and FIG. 12 (b) shows a cross-sectional view taken along the line II of FIG. 12 (a). .. In this embodiment, the case where the soft magnetic material 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. 12 (a).

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

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

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

As described above, in the present embodiment, a plurality of directional electromagnetic steels are provided inside 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, respectively. A steel plate (iron core block 12410, 12420, 12510, 12520) is inserted. Even in this way, the same effect as described in the fourth embodiment can be obtained.
Also in this embodiment, the modification described in the fourth embodiment can be adopted with respect to the soft magnetic material charged into the holes constituting the hole groups 6410, 6420, 6510, 6520. Further, 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-mentioned (variation example) section. ..

(Sixth Embodiment)
Next, a sixth embodiment of the present invention will be described. In this embodiment, a case where a soft magnetic material is inserted inside the slits 8410, 8420, 8510, and 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, detailed description of the same parts as those described above will be omitted by adding the same reference numerals as those given in FIGS. 1 to 13.

FIG. 14 is a diagram showing an example of the configuration of the stacked iron core 14000 of the present embodiment. 14 (a) shows a plan view of the iron core 14000, and FIG. 14 (b) shows a cross-sectional view taken along the line II of FIG. 14 (a). .. In this embodiment, the case where the soft magnetic material inserted into the slits 8410, 8420, 8510, and 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 a portion of the iron core blocks 14410 and 14420 in FIG. 14A. FIG. 15 (a) shows the iron core block 14410, and FIG. 15 (b) shows the iron core block 14420.

The stacked iron core 14000 has an iron core block 1100, 1200, 1300, 8401 to 8403, 8501 to 8503, 14410, 14420, 14510, 14520.

The core blocks 14410, 14420, 14510, 14520 differ only in shape and size from the core blocks 10410, 10420, 10510, 10520, 12410, 12420, 12510, 12520 described in the fourth embodiment and the fifth embodiment. Is.

That is, the iron core blocks 1441, 14420, 14510, 14520 are configured by laminating grain-oriented electrical steel sheets. The shape and size of the core blocks 14410, 14420, 14510 and 14520 are made to be the same as or (slightly) smaller than the shape and size of the gaps 8410, 8420, 8510 and 8520. Further, the plate surfaces of the grain-oriented electrical steel sheets constituting the core blocks 14410, 14420, 14510, 14520 are parallel to the X-axis direction, and the grain-oriented electrical steel sheets constituting the core blocks 8401 to 8403 and 8501 to 8503 are formed. Make it perpendicular to the board surface. Further, the rolling direction of the grain-oriented electrical steel sheets constituting the 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 core blocks 8401 to 8403 and 8501 to 8503). do.

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

Further, in the present embodiment, as shown in FIG. 15, a case where the iron 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 (a part of) may not be separated. FIG. 16 is a diagram showing an example of the configuration of the iron core block 14430, which is a modification of the iron core blocks 14410 and 14420.

The outer shape and size of the core block 14430 are the same as the (overall) outer shape and size of the core blocks 1441, 14420 arranged as shown in FIG.
In the core block 14430, the grain-oriented electrical steel sheets located at the mutually contacting portions of the core blocks 14410 and 14420 arranged as shown in FIG. 14 are separated into the region of the core block 14410 and the region of the core block 14420. Instead of using the grain-oriented electrical steel sheet, use one grain-oriented electrical steel sheet. Other configurations of the iron core block 14430 are the same as those of the iron core blocks 14410 and 14420.
By doing so, it is possible to reduce the magnetic resistance at the mutually contacting portions of the iron core blocks 14410 and 14420 shown in FIG.
The above is the same for the iron core blocks 14510 and 14520.

It should be noted that, in each of the above-described embodiments, the same shape, size, and position do not have to be exactly the same, for example, as long as they are within the design tolerances of the three-phase transformer. It shall be the same. Similarly, parallel and vertical do not have to be strictly parallel and vertical, and are assumed to be parallel and vertical, for example, within the range of design tolerances in a three-phase transformer.

(Other embodiments)
It should be noted that 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. It is a thing. That is, the present invention can be implemented in various forms without departing from the technical idea or its main features.

3000, 6000, 7000, 8000, 10000, 12000, 14000: Stacked iron core 1100, 1200, 1300: Iron core block 3400, 3500, 6400, 6500, 7400, 7500, 8401-8403, 8501-8503: York Constituent core blocks 10410, 10420, 10510, 10520, 12410, 12420, 12510, 12520: Iron core blocks 3410, 3420, 3510, 3520, 7411, 7413, 7421, 7423, 7511, 7513, 7521, 7523 to be inserted into holes. : Slit 6410, 6420, 6510, 6520: Hole group 7412, 7422, 7512, 7522: Hole 8410, 8420, 8510, 8520: Gap

Claims (7)

A three-phase transformer stacking core that has a plurality of legs and a yoke that magnetically connects the two legs that are adjacent to each other and serves as a stacking core for the three-phase transformer.
The plurality of legs are spaced apart from each other and
The extending directions of the plurality of legs are parallel, and the extending directions are parallel.
The legs and the yoke each have a plurality of laminated grain-oriented electrical steel sheets.
The stacking direction of the grain-oriented electrical steel sheets constituting the legs is the same as the stacking direction of the grain-oriented electrical steel sheets constituting the yoke.
The rolling direction of the grain-oriented electrical steel sheet constituting the leg is parallel to the first direction which is the extension direction of the leg.
The rolling direction of the directional electromagnetic steel plate 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 laminating direction of the directional electromagnetic steel plate. Parallel to the third direction,
A part of the yoke has a magnetostriction reduction region including a region having a higher magnetoresistance in at least the first direction than the other regions of the yoke.
The length of the magnetostrictive reduction region in the third direction is longer than the length of the magnetostriction reduction region in the first direction.
There is a hole in the magnetostriction reduction region,
Inside the hole, there is one electrical steel sheet or a plurality of laminated electrical steel sheets.
The plate surface of the electrical steel sheet inside the hole is parallel to the third direction and perpendicular to the plate surface of the grain-oriented electrical steel sheet constituting the yoke.
The size of one electrical steel sheet or a plurality of laminated electrical steel sheets inside the hole is the same as or smaller than the hole.
The position of the center of the magnetostrictive reduction 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. A steel core for a three-phase transformer characterized by being in the position of . The length of the magnetostrictive reduction region in the third direction is the length of the grain-oriented electrical steel sheet constituting the yoke in the third direction, and is the center of the magnetostriction reduction region in the first direction. The core for a three-phase transformer according to claim 1, wherein the length is 0.4 times or more the length in the third direction at a position passing through. The claim is characterized in that the magnetostrictive reduction region is a part of the yoke and is located in each of the regions between the centers of the two legs adjacent to each other in the third direction. Item 3. The steel core for a three-phase transformer according to Item 1 or 2 . Each of the magnetostriction reduction regions has one hole.
The three-phase transformer according to any one of claims 1 to 3 , wherein the length of the magnetostrictive reduction region in the third direction is the length of the hole in the third direction. Sekisetsu core. Each of the magnetostrictive reduction regions has a plurality of holes arranged in the third direction.
The length of the magnetostrictive reduction region in the third direction 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 product core for a three-phase transformer according to any one of claims 1 to 3 , wherein the product is provided. The electrical steel sheet inside the hole is a grain-oriented electrical steel sheet.
The product core for a three-phase transformer according to any one of claims 1 to 5 , wherein the rolling direction of the grain-oriented electrical steel sheet inside the hole is parallel to the third direction. The product core for a three-phase transformer according to any one of claims 1 to 6 , wherein the hole is a through hole penetrating in the second direction.

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