JP2019125651A - Pile core and electric device - Google Patents

Abstract

To reduce loss and noise of a pile core used in an electric device to which three-phase AC power is applied.SOLUTION: A pile core 200 includes relays 221 and 222 each having a hollow substantially regular hexagonal shape when viewing the pile core 200 from the height direction of the pile core 200, which are arranged to face each other at an interval in the height direction of the pile core 200, and legs 211, 212, and 213 extending in the height direction of the pile core 200, which are joined to the relays 221 and 222.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a pile core and an electric device, and particularly to an electric device to which three-phase AC power is applied.

  There is a three-phase transformer as an example of an electric device to which three-phase AC power is applied. An iron core is used for the three-phase transformer. Cores of three-phase transformers are roughly divided into stacked iron cores and wound iron cores. Each iron core has, for example, a plurality of legs and a plurality of yokes that are magnetically coupled to the legs and that form a closed magnetic path together with the legs. Patent Document 1 discloses a pile core for a three-phase transformer, and Patent Document 2 discloses a wound core for a three-phase transformer. In each of the iron cores, there are three legs arranged at intervals in one direction (on a straight line), and two yokes connected to the legs in the region of the upper end and lower end of the legs. And.

Japanese Patent Laid-Open No. 2000-200722 JP, 2009-252795, A

  However, when the piled iron core described in Patent Document 1 is used for a three-phase transformer, a rotating magnetic field is likely to be generated in the vicinity of the region of the boundary between the yoke portion and the central leg. The rotating magnetic field refers to a magnetic field in which the direction of the magnetic field changes in an elliptical or circular shape with a constant period. In the case of the piled iron core as described in Patent Document 1, there is a possibility that the building factor (iron loss of the material constituting the iron loss iron core of the electric device) may increase due to the fact that such a rotating magnetic field is easily generated. is there.

  On the other hand, when a wound iron core as described in Patent Document 2 is used for a three-phase transformer, the magnetic flux is in the rolling direction, so that a rotating magnetic field is hard to generate. However, in the case of manufacturing a wound iron core, strain relief annealing is performed after being shaped as an iron core. It is because distortion is introduced into the soft magnetic material plate when the soft magnetic material plate is wound into an iron core shape. When strain relief annealing is performed, there is a possibility that the strain introduced by the soft magnetic material plate may be reduced or eliminated by magnetic domain refinement. Magnetic domain fragmentation is a method of introducing local strain on the surface of a soft magnetic plate to fragment magnetic domains. For example, magnetic domain fragmentation can be realized by irradiating the soft magnetic material plate with a laser beam. Although the magnetic domain fragmentation greatly contributes to the reduction of the iron loss of the soft magnetic material plate, it is not easy to apply the technique of the magnetic domain fragmentation to the wound iron core as described above.

  Furthermore, as in the technology described in Patent Documents 1 and 2, when the legs are arranged in one direction, a magnetic path generated by flowing an exciting current through a coil wound around the center leg and The magnetic path is different from that generated by applying an exciting current to a coil wound around a leg adjacent to the central leg. For this reason, the three-phase magnetic circuit is not uniform. Therefore, there is a possibility that the magnetic flux of the harmonic which becomes a factor which makes an iron loss increase and causes noise by vibration of an iron core may be generated in an iron core.

  The present invention has been made in view of the above problems, and an object thereof is to reduce the loss and noise of a pile core used for an electric device to which three-phase AC power is applied.

The laminated core according to the present invention has a plurality of soft magnetic plates stacked, three legs having substantially the same configuration, and a plurality of soft magnetic plates stacked, and has substantially the same configuration 2 A pile iron core having three yoke parts, wherein the three legs and the two yoke parts are magnetically coupled, wherein the three legs are respectively the pile iron core The cross-sections of the three legs extend in the height direction, and the positions of the axes of the three legs in the cross section of the three legs are substantially the same as the positions of the apexes of the triangle whose center of gravity is the position of the axis of the pile core. With respect to a direction in which a virtual line which is located and which constitutes the three legs, connects the plate surface of the soft magnetic plate to the center of gravity of the triangle and the apex of the triangle on which the legs are located The soft magnetic material plates constituting the three legs are in a stacked state so as to face a substantially vertical direction. The soft magnetic plate constituting the part is in a state of being bent at at least one place, and one of the two of the two yoke parts is one end of the three legs in the longitudinal direction The other yoke part is joined to the area of the other end of the three legs in the longitudinal direction, and the yoke part and the leg In the region to be joined, the laminating directions of the soft magnetic material plates constituting the yoke portion and the leg portion are substantially the same.
An electric device according to the present invention is an electric device to which three-phase AC power is applied, and includes the pile core and a coil wound around the leg.

  According to the present invention, it is possible to reduce the loss and noise of a pile core used for an electric device to which three-phase AC power is applied.

It is a front view which shows the 1st example of a structure of a three phase transformer. It is a top view, a cross-sectional view, and a bottom view which show the 1st example of composition of a three-phase transformer. It is a figure which shows the 1st example of a mode that the piled iron core of the 1st example was expanded. It is a figure which shows the 2nd example of a mode that the piled iron core of the 1st example was expanded. It is a top view, a cross section, and a bottom view showing composition of a modification of the 1st example of a three phase transformer. It is a front view which shows the 2nd example of a structure of a three phase transformer. It is a top view and a bottom view showing the 2nd example of composition of a three phase transformer. It is a figure which shows the 1st example of a mode that the piled iron core of the 2nd example was expanded. It is a figure which shows the 2nd example of a mode that the piled iron core of the 2nd example was expanded.

  As a pile core used in electrical equipment to which single-phase AC power is applied, two legs arranged at intervals in one direction (on a straight line), a region of the upper end of the two legs, There is a pile iron core (a pile iron core having a substantially mouth-like shape when viewed from the front) having two yoke portions joined respectively to the area of the lower end. The present inventors focused on the fact that the building factor is close to 1 in such a core. In the following description, such a piled iron core will be referred to as a two-legged iron core if necessary.

  In a two-legged iron core, the magnetic path does not change significantly even when the yoke portion is bent, so the volume of the bent portion of the yoke portion where iron loss is slightly deteriorated is sufficiently smaller than the volume of the entire yoke portion. If so, the building factor does not change much from the case without bending the yoke. Therefore, the present inventors combine three two-legged iron cores with bent yoke portions in the circumferential direction of the pile core (around the pile iron core axis) to construct the iron core, without reducing the building factor. It was conceived that the three-phase magnetic circuit could be equally brought close to suppress the generation of harmonic magnetic flux. Each embodiment described below is made based on such an idea.

  In addition, although the present inventors have a B8 (a magnetic flux density at a magnetic field strength of 800 A / m) that is large in directional magnetic steel sheets, the directional magnetic steel sheets that are large in B8 are three-phase transformers When used as an iron core, it has been found that the improvement rate of iron loss of the iron core is smaller than an expected value based on the improvement rate of iron loss of the grain-oriented electrical steel sheet itself. This is considered to be because when B8 of the grain-oriented electrical steel sheet is increased, the magnetic anisotropy in the grain-oriented electrical steel sheet is improved, and thus the straightness of the magnetic flux in the rolling direction of the grain-oriented electrical steel sheet is increased. B8 reflects the degree of orientation integration of the grain-oriented electrical steel sheet, and the degree of orientation integration of the grain-oriented electrical steel sheet increases as B8 increases. The azimuthal integration degree indicates the degree of orientation of the Miller index to the Goss orientation, and indicates that the higher the azimuthal integration degree, the more grains having the Miller index oriented to the Goss orientation.

The soft magnetic material plate constituting the pile core described in each of the following embodiments is not limited to the directional magnetic steel plate, and may be, for example, a non-oriented magnetic steel plate or a soft magnetic material plate other than the magnetic steel plate, From the above findings, in each of the following embodiments, the case where the soft magnetic plate constituting the pile core is a directional electromagnetic steel sheet will be described as an example.
In each of the following embodiments, a three-phase transformer will be described as an example of an electric device to which three-phase AC power is applied. However, the electric equipment to which three-phase AC power is applied is not limited to the three-phase transformer, and may be, for example, a three-phase reactor.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In each figure, the X, Y, and Z coordinates indicate the relationship of the direction in each figure, and those with an x in the 示 し indicate the direction from the near side to the far side of the sheet, and in the ○ Those marked with a ● indicate the direction from the back to the front of the paper. Further, in the following drawings, for convenience of notation and explanation, only those necessary for the explanation are shown as simplified as necessary.

First Embodiment
First, the first embodiment will be described.
FIG. 1 is a view showing an example of the configuration of a three-phase transformer, and a view of the three-phase transformer as viewed from the front thereof. FIG. 2 is a view showing an example of the configuration of the three-phase transformer, and a top view (FIG. 2 (a)) of the three-phase transformer viewed from above (Z-axis direction) and Z of the three-phase transformer The cross section which shows the cross section in the center of the direction of an axis (II cross section figure of Drawing 1, Drawing 2 (b)), the bottom view which looked at the three phase transformer from the lower part (Z-axis direction) (figure 2) (C)).
The three-phase transformer has a piled iron core 200 and three coil groups 310, 320, 330.

The pile core 200 has three legs 211, 212, 213 and two yokes 221, 222.
The three legs 211, 212, 213 are substantially the same (the shape and the size are substantially the same). The three legs 211, 212, 213 have a plurality of stacked electromagnetic steel sheets. The three legs 211, 212, 213 are arranged such that their longitudinal direction is along the height direction of the pile core 200 (Z-axis direction). As shown in FIG. 2B, the shape of the cross sections (sections cut in the direction perpendicular to the height direction (Z-axis direction) of the pile core 200) of the legs 211, 212, 213 is a quadrangle.

  Moreover, in the cross section of three leg part 211, 212, 213, the length (width | variety) of the plate surface direction of the directionality electromagnetic steel plate which comprises three leg part 211, 212, 213 is substantially the same. Further, in the cross section of the three legs 211, 212, 213, the center of gravity (axis) 211a, 212a, 213a of the three legs 211, 212, 213 corresponds to the axis 200a of the pile core 200 (at the center of gravity of the pile core 200). It is located at substantially the same position as the vertex of a substantially regular triangle whose center of gravity is the axis passing through the position and extending in the height direction (Z-axis direction). The three legs 211, 212, and 213 are arranged so as to be approximately three-fold symmetrical about the axis 200a of the pile core 200.

  Moreover, in the cross section of three legs 211, 212, 213, the plate surface of the directionality electromagnetic steel plate which constitutes three legs 211, 212, 213 is the axis 200a of pile iron core 200, and the leg concerned, respectively. A direction in which the three legs 211, 212, 213 are configured to face a direction substantially perpendicular to the direction in which virtual lines connecting the centers of gravity (axes) 211a, 212a, 213a of 211, 212, 213 extend. Magnetic steel sheets are laminated.

  The two yoke portions 221 and 222 are substantially the same (the shape and the size are substantially the same). As shown in FIGS. 2 (a) and 2 (c), the two yoke portions 221, 222 have a shape that orbits around the axis 200a of the pile core 200. Specifically, the shapes of the two yoke portions 221 and 222 are hollow n-prisms which are substantially coaxial with the axis 200 a of the pile core 200. Here, n is an integer of 3 or more and a multiple of 3, preferably 6 or more. In addition, it is preferable that the shapes of the outer edges of the upper surface and the lower surface (bottom surface) of the n-prism be approximately regular triangle. That is, in the n-prism, it is preferable that each corner of the regular triangular prism be n / 3 bent portions. Thus, the two yoke portions 221 and 222 have three or more bent portions (in the example shown in FIG. 2A, the six bent portions (the shape of the two yoke portions 221 and 222) Is a hollow hexagonal prism substantially coaxial with the shaft 200a of the pile core 200, so each corner of the regular triangular prism is made into 2 (= 6/3) bent portions)). The hollow region is a region which penetrates in the direction of the axis 200 a of the pile core 200. In FIG. 2, the case where the shape of the two yoke portions 221 and 222 is a hollow regular hexagonal column will be described as an example.

  The two yoke portions 221 and 222 are disposed in a state of being joined to the region of the upper end and the region of the lower end of the three legs 211, 212 and 213, respectively. Thus, the yoke portions 221 and 222 and the legs 211, 212 and 213 are magnetically coupled. Under the present circumstances, it is preferable to make it the area | regions of a part of the plate surface of the directionality electromagnetic steel plate which comprises them as a yoke part 221, 222 and leg part 211, 212, 213 mutually overlap. The term "joining" means that the thick portions are butted, and does not mean that they are physically not removable (this is the same in the following description).

  The yoke portion 221 has three sets 221 a to 221 c of the same configuration as a set of stacked (stacked) plural directional electromagnetic steel sheets. In the following description, this set will be referred to as yoke components 221a to 221c as needed. The plurality of directional electromagnetic steel plates constituting each of the yoke structural portions 221a to 221c have different lengths in the longitudinal direction and bending positions. The plurality of directional electromagnetic steel plates constituting each of the yoke forming portions 221a to 221c have shapes (bent portions) bent at substantially the same bending angle at two positions in the longitudinal direction. In the example shown to Fig.2 (a), the said bending angle is about 60 degrees. Here, a bending angle is a bending angle from the state of the plane of the directionality electromagnetic steel plate which constitutes yoke part constituent parts 221a-221c. Therefore, the angle (smaller one of the two angles) of the two corner portions of the yoke portions 221a to 221c is approximately 120 °.

  As shown in FIG. 2 (a), in each of the yoke construction parts 221a to 221c, the concave surfaces of the bent portions of the plurality of directional electromagnetic steel plates constituting them are directed to the shaft 200a side of the pile core 200 and The plate surfaces of the plurality of directional electromagnetic steel plates face in a direction substantially perpendicular to a virtual plane perpendicular to the axis 200a of the pile core 200, and each yoke component 221a to 221c and the axis 200a of the pile core 200 Are arranged so as to be approximately equidistant. Accordingly, the longitudinal ends of the respective yoke components 221a to 221c are joined.

  In the present embodiment, when the piled iron core 200 is viewed from above and below (when viewed from the height direction (Z-axis direction)), the two yoke component parts 221a disposed at positions adjacent to each other. The regions of the joint portions 231a, 231b, 231c of the regions 221b, 221b, 221c, 221c, 221a are included in the regions of the legs 211, 212, 213, respectively. That is, a virtual plane (perpendicular to the axis 200a of the pile core 200) of the joint portions 231a, 231b, 231c of the two yoke component parts 221a, 221b, 221a, 221c, 221b, 221c arranged at mutually adjacent positions Coordinates on the X-Y plane) are included in coordinates on a virtual plane (X-Y plane) perpendicular to the axis 200a of the pile core 200 of the legs 211, 212, and 213, respectively.

  By configuring and arranging the respective yoke components 221a to 221c as described above, in each of the yoke components 221a to 221c, bending of the plurality of directional electromagnetic steel plates constituting the respective yoke components 221a to 221c is performed. A region between the two positions described above constitutes one side of a hollow substantially regular hexagon which is a planar shape of the yoke portion 221. In addition, the other regions (regions other than the region between the two bent positions) of the plurality of directional electromagnetic steel plates constituting the yoke components 221a to 221c, and the yoke components 221a to 221c A side of a hollow substantially hexagonal shape which is a planar shape of the yoke portion 221 with the other regions (regions other than the region between the two bent positions) of the yoke components 221a to 221c to be joined. Configure Therefore, a total of six bending portions of the yoke portion 221 are provided. In addition, the number of the location of the several directionality electromagnetic steel plates which comprise each yoke part is decided according to the planar shape of a yoke part. For example, when the planar shape of the yoke portion is a hollow triangle, the number of bent portions of the plurality of directional electromagnetic steel plates constituting each yoke component may be one (one yoke portion). There will be a total of three places where it can be folded).

  As shown in FIGS. 2 (a) to 2 (c), a plurality of directional electromagnetic steel plates constituting the yoke portion 221 are disposed in regions joined to the legs 211, 212 and 213. The stacking direction of the grain-oriented electrical steel sheet is substantially the same as the stacking direction of the plurality of grain-oriented magnetic steel sheets that make up the legs 211, 212, 213. The stacking direction of the plurality of directional electromagnetic steel plates constituting the yoke portion 221 (the yoke forming portions 221a to 221c) is changed to a different direction at the bending position described above. It is a lamination direction of a plurality of directionality electromagnetic steel plates which constitute the yoke part 221 (the yoke constituent parts 221a to 221c), and an angle formed by mutually different lamination directions is approximately 60 °.

Here, the bending of the grain-oriented electrical steel sheet can be performed using, for example, a known technique such as a unicore processing machine.
In addition, heat treatment is applied to at least the bent portion of the grain-oriented electrical steel sheet to reduce the plastic strain introduced by bending, and as a result, the iron loss value at the bent portion of the grain-oriented electrical steel sheet (increases with plastic strain) It is preferable that the ratio with respect to the core loss value in the other area | region of the grain oriented electrical steel sheet is 1.5 or less. It is because deterioration of the building factor by bending can be suppressed.
As described above, the yoke portion 222 is substantially the same as the yoke portion 221, and in the description of the yoke portion 221 described above, the reference numeral 221 is for reference 222, and the reference numeral 231 is for 232. It will be replaced. Therefore, the detailed description of the yoke portion 222 is omitted.

  Further, it is preferable to carry out magnetic domain refinement on the grain-oriented electrical steel sheets constituting the legs 211, 212, 213 and the yoke portions 221, 222. For example, magnetic domain fragmentation can be realized by scribing with a ballpoint pen, irradiation of a laser beam, irradiation of an electron beam, or irradiation of plasma on the surface of a grain-oriented electrical steel sheet. By these methods, for example, strain can be linearly introduced so as to be substantially orthogonal to the rolling direction of the grain-oriented electrical steel sheet. When the above-described heat treatment is performed on the bent portion, it is preferable that the other regions of the grain-oriented electrical steel sheet are not affected by the heat treatment.

  The coil groups 310, 320, 330 have coils wound around the legs 211, 212, 213 of the stack core 200, respectively. In the present embodiment, since the three-phase transformer is described as an example, the coil groups 310, 320, and 330 correspond to, for example, the U-phase, the V-phase, and the W-phase, respectively. And a secondary coil (a coil that outputs a secondary voltage). The coil groups 310, 320, 330 can be realized by known coils applied to a three-phase transformer. Therefore, the detailed description of the coil groups 310, 320, 330 is omitted.

  As described above, the joining of the three yoke component parts 221a to 221c and 222a to 222c constitutes a (one) yoke part 221, 222. Moreover, the piled iron core 200 is comprised by joining the leg parts 211-213 and the yoke parts 221 and 222. FIG. Below, an example of these joining methods is demonstrated.

  FIG. 3 is a view showing a first example of a state in which the piled iron core 200 is expanded. FIG. 3A is a developed view of the area of the inner circumferential surface of the pile core 200. As shown in FIG. FIG. 3B is a developed view of a region on the upper surface of the pile core 200 (a region of the pile core 200 when viewed from the positive direction of the Z-axis toward the negative direction). FIG.3 (c) is a figure which expand | deploys and shows the area | region (The area | region of the pile core 200 when it sees toward the positive direction from the negative direction of Z-axis) of the lower surface of the pile core 200. FIG. In FIG. 3, for convenience of description, the number of laminated directional electromagnetic steel sheets is different from that in FIG. 2. Moreover, in FIG. 3 (a), a broken line shows the outline of the directionality electromagnetic steel plate in the back side (the positive direction side of the Y-axis) of the directionality steel plate of the outermost surface.

  As shown in FIGS. 3 (a) to 3 (c), the yoke parts 221a to 221c and 222a to 222c of the yoke parts 221 and 222 are a plurality of pentagonal directional electromagnetic steel plates, respectively. It is configured by laminating so that the position of the end in the direction (longitudinal direction) along the long side is repeatedly displaced in a step-like manner. Here, the rolling direction of the grain-oriented electrical steel sheet is substantially parallel to the direction (longitudinal direction of the yoke portions 221 and 222) along the longest side (longitudinal direction) of the pentagon (the yoke component shown in FIG. 3) 221a-221c, 222a-222c (see the double arrow lines).

  In FIG. 3A, a plurality of directional electromagnetic steel plates stacked in this manner are shown as directional electromagnetic steel plate groups 301 to 306, respectively. The plurality of directional electromagnetic steel plates constituting the yoke construction parts 221a to 221c and 222a to 222c have a bending angle of approximately 60 ° at a position matching the bending positions of the yoke construction parts 221a to 221c and 222a to 222c It is bent to The lengths in the longitudinal direction of the plurality of directional electromagnetic steel plates constituting the yoke components 221a to 221c and 222a to 222c shown in FIGS. 2 (a) and 2 (c) are from the inner circumferential side of the pile core 200. Also, the outer peripheral side (the back side than the front side of the paper surface of FIG. 3A) is longer. The yoke component portions 221a to 221c and 222a to 222c are configured such that the longitudinal ends of the laminated directional electromagnetic steel plates are aligned when the directional electromagnetic steel plates are laminated so that the bending positions match each other. Longitudinal lengths and bending positions of the plurality of oriented electromagnetic steel sheets are determined.

  As shown to Fig.3 (a), the legs 211-213 are a position of the direction (longitudinal direction of the legs 211-213) along the longest side of the hexagon concerned with a plurality of hexagonal directional electromagnetic steel plates. Are stacked in a stepwise manner so as to be repeatedly displaced. Here, the rolling direction of the grain-oriented electrical steel sheet is substantially parallel to the direction (longitudinal direction of the legs 211 to 213) along the longest side of the hexagon (legs 211 to 213 in FIG. 3A). See the double arrow line shown in).

  In FIG. 3A, a plurality of directional electromagnetic steel plates stacked in this manner are shown as directional electromagnetic steel plate groups 307 to 309, respectively. The lengths in the longitudinal direction of the plurality of hexagonal directional electromagnetic steel plates constituting the legs 211 to 213 are the same and are not bent.

  A pile iron core 200 is configured by joining the directional electromagnetic steel plate groups 301 to 309 configured in this manner. In the example shown in FIG. 3, the case where the method of joining (butting) of the directional electromagnetic steel plate groups 301 to 309 is used as step lap joining is shown. The step-lap bonding is realized by laminating the plates so that the positions of the longitudinal end portions of the plates are periodically shifted in a step-like manner when the thick portion in the longitudinal direction of the plates is viewed.

  In the example shown in FIG. 3, one end in the longitudinal direction of the directional electromagnetic steel plate group 301 constituting the yoke component portion 221a, one end in the longitudinal direction of the directional electromagnetic steel plate group 302 constituting the yoke component portion 221b, and a leg Step lap bonding is performed with one end in the longitudinal direction of the directional electromagnetic steel plate group 307 that constitutes the portion 211. Further, the other end in the longitudinal direction of the directional electromagnetic steel plate group 302 constituting the yoke construction portion 221b, one end in the longitudinal direction of the directional electromagnetic steel plate group 303 constituting the yoke construction portion 221c, and the leg portion 213 are configured. Step lap welding is performed with one end of the longitudinal electromagnetic steel plate group 308 in the longitudinal direction. Further, the other end in the longitudinal direction of the directional electromagnetic steel plate group 303 constituting the yoke construction portion 221c, the other end in the longitudinal direction of the directional electromagnetic steel plate group 302 constituting the yoke construction portion 221a, and the leg portion 212 Step wrap bonding is performed with one end in the longitudinal direction of the directional electromagnetic steel sheet group 309 to be configured. As in the case of the yoke components 221a to 221c, the step parts of the yoke components 222a to 222c and the legs 211 to 213 and two yoke components disposed adjacent to the yoke component are connected to the step-lap joint. Be done.

In the example shown in FIG. 3, when the thickness portion of the grain-oriented electrical steel sheet in the longitudinal direction of the grain-oriented electrical steel sheet (X-axis direction in FIG. 3B and Y-axis direction in FIG. The case where each position of the end of the longitudinal direction of a directionality electromagnetic steel plate is made to shift periodically in the shape of a step is shown for every six directionality electromagnetic steel plates which adjoin in the thickness direction of a directionality electromagnetic steel plate.
In the example shown in FIG. 3, although the case where the position of the end in the longitudinal direction of the directional electromagnetic steel sheet is shifted for each directional electromagnetic steel sheet, the position of the end in the longitudinal direction of the directional electromagnetic steel sheet is The plurality of directional electromagnetic steel plates may be shifted.

  By adopting the above-described step lap bonding, when the thickness portion in the longitudinal direction of the grain-oriented electrical steel sheet is viewed, the position of the longitudinal end of the grain-oriented electrical steel sheet gradually changes The concentration of magnetic flux at each position in the thickness direction of the longitudinal electromagnetic steel sheet (that is, the magnetic flux becomes uneven in the thickness direction of the longitudinal magnetic steel sheet) Can be suppressed.

  FIG. 4 is a view showing a second example of the state in which the piled iron core 200 is expanded. FIG. 4A is a developed view of the area of the inner circumferential surface of the pile core 200. FIG. 4B is a developed view of a region on the upper surface of the pile core 200 (a region of the pile core 200 when viewed from the positive direction of the Z-axis toward the negative direction). FIG.4 (c) is a figure which expand | deploys and shows the area | region (The area | region of the pile core 200 when it sees from the negative direction of Z-axis toward the positive direction) of the lower surface of the pile iron core 200. FIG. In FIG. 4 as well as in FIG. 3, the number of laminated directional magnetic steel sheets is different from that in FIG. 2 for convenience of description. Moreover, in FIG. 4 (a), a broken line shows the outline of the directionality electromagnetic steel plate in the back side (the positive direction side of the Y-axis) of the directionality steel plate of the outermost surface.

  As shown in FIGS. 4 (a) to 4 (c), the yoke parts 221a to 221c and 222a to 222c of the yoke parts 221 and 222 are formed of a plurality of pentagonal directional electromagnetic steel plates in the longitudinal direction thereof. It is comprised by laminating | stacking so that an edge part may be arrange | positioned alternately by two positions of a 1st position and a 2nd position. Here, the rolling direction of the grain-oriented electrical steel sheet is substantially parallel to the direction (longitudinal direction of the yoke portions 221 and 222) along the longest side (longitudinal direction) of the pentagon (the yoke constituent portion in FIG. 4) 221a-221c, 222a-222c (see the double arrow lines).

  In FIG. 4A, a plurality of directional electromagnetic steel plates stacked in this manner are shown as directional electromagnetic steel plate groups 401 to 406, respectively. The plurality of directional electromagnetic steel plates constituting the yoke construction parts 221a to 221c and 222a to 222c have a bending angle of approximately 60 ° at a position matching the bending positions of the yoke construction parts 221a to 221c and 222a to 222c It is bent to As shown in FIGS. 2 (a) and 2 (c), the length in the longitudinal direction of the plurality of directional electromagnetic steel plates constituting the yoke components 221a to 221c and 222a to 222c is the inner circumference of the pile iron core 200. The outer peripheral side (the back side than the front side of the sheet of FIG. 4A) is longer than the side. The yoke component portions 221a to 221c and 222a to 222c are configured such that the longitudinal ends of the laminated directional electromagnetic steel plates are aligned when the directional electromagnetic steel plates are laminated so that the bending positions match each other. Longitudinal lengths and bending positions of the plurality of oriented electromagnetic steel sheets are determined.

  As shown in FIG. 4 (a), the legs 211 to 213 alternately have a plurality of hexagonal directional electromagnetic steel plates, and their longitudinal ends alternate in two positions, a first position and a second position. It is comprised by laminating | stacking so that it may be arrange | positioned. Here, the rolling direction of the grain-oriented electrical steel sheet is substantially parallel to the direction (longitudinal direction of the legs 211 to 213) along the longest side (longitudinal direction) of the hexagon (the leg of FIG. 4A) See the double arrow lines shown in sections 211-213).

  In FIG. 4A, a plurality of directional electromagnetic steel plates stacked in this manner are shown as directional electromagnetic steel plate groups 407 to 409, respectively. The lengths in the longitudinal direction of the plurality of hexagonal directional electromagnetic steel plates constituting the legs 211 to 213 are the same and are not bent.

  A pile iron core 200 is configured by joining the directional electromagnetic steel sheet groups 401 to 409 configured in this manner. In the example shown in FIG. 4, the case where the system of joining (butting) of the directionality electromagnetic steel plate groups 301-309 is made into an alternate lap joining is shown. The alternate lap joint is such that when looking at the thick portion in the longitudinal direction of the plate, the positions of the longitudinal ends of the plate are alternately arranged at two positions of the first position and the second position It is realized by laminating the plates on the In the method of joining the directional electromagnetic steel sheet groups 401 to 409, in the description of the method of joining the directional electromagnetic steel sheet groups 301 to 309 described above, reference numerals 301 to 309 are 401 to 409, and step lap joint is alternate lap joint It will be replaced. Therefore, the detailed description of the method of joining the directional electromagnetic steel plate groups 401 to 409 is omitted.

Even in the case of the alternate lap joint, like the step lap joint, the concentration of the magnetic flux at each position in the thickness direction of the longitudinal end of the directional electromagnetic steel sheet (that is, the plate of the longitudinal end of the directional electromagnetic steel sheet Uneven magnetic flux can be suppressed in the thickness direction. Although the effect of suppressing the concentration of the magnetic flux is larger in the step wrap junction than in the alternate wrap junction, the alternate wrap junction is easier to stack than the step wrap junction.
The step lap bonding and the alternate lap bonding itself can be realized by known techniques, and various methods other than those shown in FIGS. 3 and 4 may be adopted as the method of the step lap bonding and the alternate lap bonding. Can.

For fixing the directional electromagnetic steel plate groups 301 to 309 and 401 to 409, for example, a hole is made in the directional electromagnetic steel plate, and a bolt is passed through the hole in a state electrically insulated from the directional electromagnetic steel plate, It is realized by tightening the bolt with a nut in a state of being electrically insulated from the grain-oriented electrical steel sheet, using a case, or performing welding.
A piled iron core 200 is configured as described above.

  As described above, in the present embodiment, when the piled iron core 200 is viewed from the height direction of the piled iron core 200, the piled iron core 200 is a yoke part 221, 222 having a hollow substantially regular hexagonal shape, The yoke portions 221 and 222 are arranged to face each other at intervals in the height direction of the pile core 200, and the leg portions 211, 212 and 213 are extended in the height direction of the pile core 200. And leg portions 211, 212, and 213 joined to the yoke portions 221 and 222, respectively. In addition, the coordinates on the XY plane of the area of the joint (for example, 231a) of the two yoke parts (for example, yoke parts 221a and 221b) arranged at mutually adjacent positions are the legs. It is made to be included in the coordinates on the XY plane of the area of the leg portion 211, for example. Therefore, the magnetic flux flowing along the direction of the plate surface of the direction-oriented electrical steel sheet constituting the pile core 200 approaches equally in each phase of the three-phase alternating current than in the techniques described in Patent Documents 1 and 2, Since the magnetic circuit can be made to approach equally, generation | occurrence | production of a rotating magnetic field can be suppressed. Therefore, for example, even when using a grain-oriented electrical steel sheet having a large B8, it is possible to suppress the reduction of the building factor and to suppress the generation of the magnetic flux of harmonics in the stack iron core 200. Thus, the loss and noise of the pile core 200 can be reduced.

  In the present embodiment, the case where the cross sections of the legs 211, 212, and 213 are square is described as an example. However, the shape of the cross section of the legs 211, 212, 213 is not limited to a square. FIG. 5 is a view showing the configuration of a modification of the three-phase transformer, and is a top view of the three-phase transformer seen from above (FIG. 5 (a)) and the center in the height direction of the three-phase transformer They are a cross-sectional view (FIG. 5 (b)) which shows the cross-section in (a), and the bottom view which looked at the three-phase transformer from the downward direction (FIG. 5 (c)).

In FIG. 5, the three-phase transformer has a piled iron core 500 and three coil groups 510, 520, 530.
The pile core 500 has three legs 511, 512, 513 and two yokes 621, 622.
In the example illustrated in FIG. 2B, the cross sections of the legs 211, 212, and 213 are square. On the other hand, in the example shown in FIG. 5B, in the cross sections of the leg portions 511, 512, 513, the length (width) in the plate surface direction of the grain oriented electromagnetic steel plate is in the lamination direction of the grain oriented electromagnetic steel plate. Make it smaller gradually from the center to the edge. Specifically, in the example shown in FIG. 5 (b), in the cross sections of the legs 511, 512, 513, the length in the plate surface direction of the directional electromagnetic steel sheet positioned at the center in the lamination direction of the directional electromagnetic steel sheets is the most A plurality of directions from the center to the end in the lamination direction of the directionality electromagnetic steel sheets so that the length in the plane direction of the directionality steel sheets located at the end in the lamination direction of the long directionality steel sheets is the shortest. The length of the grain direction of the grain-oriented electrical steel sheet in a multistage manner for each of the magnetic grain steel sheets.

The length and the number of laminated directional electromagnetic steel plates constituting the yoke portions 521 and 522 are determined in accordance with the shapes of the leg portions 511, 512, and 513.
By doing as above, the shape of the cross section of the legs 511, 512, 513 can be made close to a circle, and the coils constituting the coil groups 510, 520, 530 can be wound in a near circular shape. it can.

In the case where the piled iron core 500 is configured as shown in FIG. 5, as in the piled iron core 200 shown in FIG. 2, the three legs 511, 512, 513 in the cross section of the three legs 511, 512, 513. The plate surface of the directional electromagnetic steel plate constituting the direction is a direction in which an imaginary line connecting the axis 500a of the pile core 500 and the center of gravity (axis) 511a, 512a, 513a of the legs 511, 512, 513 extends. The directional electromagnetic steel plates constituting the three legs 511, 512, 513 are laminated so as to face a direction substantially perpendicular to the above.
Further, among the plurality of directional electromagnetic steel plates constituting the yoke portions 521 and 522, the stacking direction of the plurality of directional electromagnetic steel plates disposed in the region joined to the legs 511, 512 and 513 is the leg It becomes substantially the same as the lamination direction of a plurality of directionality electromagnetic steel plates which constitute 511, 512, 513.

  Further, as in the present embodiment, in the cross section of the three legs 211, 212, 213, the center of gravity (axis) 211a, 212a, 213a of the three legs 211, 212, 213 is the axis 200a of the pile core 200. It is preferable that the three-phase magnetic circuit can be made to approach more evenly if the three-phase magnetic circuit can be made to approach more uniformly if the three-phase magnetic circuit is positioned approximately at the same position as the vertex of the substantially regular triangle. The triangle may not necessarily be a substantially equilateral triangle, as long as the center of gravity of the two legs is positioned substantially at the same position as the apex of the triangle whose center of gravity is at the center of the core.

Second Embodiment
Next, a second embodiment will be described. In the first embodiment, the X-Y plane of the area of the joint (for example, joint 231a) of two yoke parts (for example, yoke parts 221a and 221b) arranged at mutually adjacent positions. The case where the upper coordinates are included in the coordinates on the XY plane of the region of the leg (for example, the leg 211) has been described as an example. On the other hand, in the present embodiment, without doing this, the joint between the two yoke components is in the region between the two joints between the legs 211, 212, 213 and the yoke 221. The case will be described. As described above, the present embodiment and the first embodiment mainly differ in a part of the configuration of the yoke portion. Therefore, in the description of the present embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals as those in FIGS. 1 to 5, and the detailed description is omitted.

  FIG. 6 is a view showing an example of the configuration of the three-phase transformer, and is a front view of the three-phase transformer as viewed from the front thereof. FIG. 7 is a view showing an example of the configuration of a three-phase transformer, and a top view (FIG. 7 (a)) of the three-phase transformer viewed from above (height direction) and the three-phase transformer It is a bottom view (Drawing 7 (b)) seen from the bottom (height direction). A diagram showing a cross section at the center in the height direction of the three-phase transformer (I-I cross-sectional view of FIG. 6) is the same as FIG. 2B (however, reference numeral 200a is replaced by reference numeral 600a) ).

The three-phase transformer has a piled iron core 600 and three coil groups 310, 320, 330.
The pile core 600 has three legs 211, 212, 213 and two yokes 621, 622.
The three coil groups 310, 320, 330 and the three legs 211, 212, 213 can be realized with the same as described in the first embodiment.

  The two yoke portions 621 and 622 are substantially the same (substantially the same in shape and size). As shown in FIGS. 7A and 7B, the two yoke portions 621 and 622 have a shape that orbits around an axis 600a of the pile core 600. Specifically, also in the present embodiment, as in the case of the yoke portions 221 and 222 of the first embodiment, the case where the shapes of the two yoke portions 621 and 622 are hollow regular hexagonal columns will be described as an example. .

  The two yoke portions 621 and 622 are disposed in a state of being joined to the upper end region and the lower end region of the three legs 211, 212 and 213, respectively. Thus, the yoke portions 621 and 622 and the legs 211, 212 and 213 are magnetically coupled. Under the present circumstances, it is preferable to make it the area | regions of a part of the plate surface of the directionality electromagnetic steel plate which comprises them as the yoke parts 621 and 622 and the leg parts 211, 212, and 213 mutually overlap.

  The yoke portion 621 has three sets 621 a to 621 c of the same configuration as a set of stacked (stacked) directional electromagnetic steel sheets. In the following description, this set will be referred to as yoke components 621a to 621c as needed. The plurality of directional electromagnetic steel plates constituting each of the yoke component portions 621a to 621c have different lengths in the longitudinal direction and bending positions. The plurality of directional electromagnetic steel plates constituting each yoke component have shapes (bent portions) bent at substantially the same bending angle at two positions in the longitudinal direction. In the example shown in FIGS. 7 (a) and 7 (b), the bending angle is approximately 60 degrees. As mentioned above, a bending angle is a bending angle from the state of a plane of the directionality electromagnetic steel plate which constitutes yoke part constituent parts 621a-621c. Therefore, the angle (smaller one of the two angles) of the two corner portions of the yoke portions 621a to 621c is approximately 120 °.

  As shown in FIGS. 7 (a) and 7 (b), in each of the yoke component parts 621a to 621c, the concave surfaces of the bent parts of the plurality of directional electromagnetic steel plates constituting them are on the side of the shaft 600a of the pile core 600. And the plate surfaces of the plurality of directional electromagnetic steel plates are directed substantially perpendicular to a virtual plane perpendicular to the axis 600a of the pile core 600, and stacked with the respective yoke component portions 621a to 621c. It arrange | positions so that distance with the axis | shaft 600a of the iron core 600 may become substantially equal distance. Therefore, the longitudinal direction end parts of the respective yoke component parts 621a to 621c are joined.

  In this embodiment, the joints 631a, 631b, 631c of the two yoke component parts 621a, 621b, 621b, 621c, 621c, 621a arranged at mutually adjacent positions are perpendicular to the axis 600a of the core 600. The coordinates on the virtual plane (X-Y plane) are not included in the coordinates on the virtual plane (X-Y plane) perpendicular to the axis 600 a of the pile core 600 of the legs 211, 212, 213. Specifically, in the present embodiment, the joint portions 631a, 631b, 631c of the two yoke component parts 621a, 621b, 621b, 621c, 621c, 621a arranged at mutually adjacent positions are respectively of the stacked iron core 600. Two legs adjacent to each other in the circumferential direction (direction around the axis 600a) (two legs located at both ends of each side of a substantially regular triangle whose apexes are the centers (axes) of the three legs 211 to 213) 21), 213, 211, 212, 212, and 213, and the intermediate position of the junction of the yoke portion 621).

  As described above, by forming and arranging each of the yoke component parts 621a to 621c, in each of the yoke component parts 621a to 621c, bending of the plurality of directional electromagnetic steel plates constituting the yoke component parts 621a to 621c is performed. A region between the two positions described above constitutes one side of a hollow substantially regular hexagon which is a planar shape of the yoke portion 621. In addition, the other regions (regions other than the region between the two bent positions) of the plurality of directional electromagnetic steel plates constituting the yoke component portions 621a to 621c, and the yoke component portions 621a to 621c and A side of the hollow substantially regular hexagon which is a planar shape of the yoke portion 621 with the other regions (regions other than the region between the two bent positions) of the yoke structural portions 621a to 621c to be joined. Configure

  As shown in FIG. 2 (b), FIG. 6 (a), and FIG. 6 (b), regions of the plurality of directional electromagnetic steel plates constituting the yoke portion 621 that are joined to the legs 211, 212, and 213 The lamination direction of the plurality of directional electromagnetic steel sheets disposed in the direction is substantially the same as the lamination direction of the plurality of directional electromagnetic steel sheets constituting the leg portions 211, 212, and 213. The stacking direction of the plurality of directional electromagnetic steel plates constituting the yoke portion 621 (the yoke component portions 621a to 621c) is changed to a different direction at the bending position described above. It is a lamination direction of a plurality of directionality electromagnetic steel plates which constitute relay part 621 (relay constituent parts 621a to 621c), and an angle formed by mutually different lamination directions is approximately 60 °.

Here, the bending of the grain-oriented electrical steel sheet can be performed using, for example, a known technique such as a unicore processing machine.
As described above, the yoke portion 622 is substantially the same as the yoke portion 621, and in the description of the yoke portion 621 described above, the reference numerals 621 and 621 and 631 and 632 are respectively described. It will be replaced. Therefore, the detailed description of the yoke portion 622 is omitted.
Further, as described in the first embodiment, it is possible to perform heat treatment on the bent portion of the grain-oriented electrical steel sheet or to perform magnetic domain fragmentation on the grain-oriented electrical steel sheet.

  As described above, the joining of the three yoke component parts 621a to 621c and 622a to 622c constitutes a (one) yoke part 621 or 622. A stacked iron core 600 is formed by joining the leg portions 211 to 213 and the yoke portions 621 and 622. These bonding methods can be realized by, for example, step lap bonding or alternate lap bonding as in the first embodiment. Below, an example of these joining methods is demonstrated.

  FIG. 8 is a diagram showing a first example of a state in which the piled iron core 600 is developed. FIG. 8A is a developed view of the region of the inner peripheral surface of the pile core 600. As shown in FIG. FIG. 8B is a developed view of a region on the upper surface of the pile core 600 (a region of the pile core 600 when viewed from the positive direction of the Z-axis toward the negative direction). FIG. 8C is a developed view of a region on the lower surface of the pile core 600 (a region of the pile core 600 when viewed from the negative direction of the Z-axis toward the positive direction). In FIG. 8, for convenience of description, the number of laminated directional electromagnetic steel sheets is different from that in FIG. 7. Moreover, in FIG. 8 (a), a broken line shows the outline of the directionality electromagnetic steel sheet in the back side (the positive direction side of the Y-axis) of the directionality steel sheet of the outermost surface.

  As shown in FIGS. 8A to 8C, the yoke constituent portions 621a to 621c and 622a to 622c of the yoke portions 621 and 622 have longitudinal ends of leg portions 211 to 213 with respect to a rectangle. The position of the end of the direction (longitudinal direction of the yoke portions 621 and 622) along the long side (longitudinal direction) of the rectangle is a stair It is comprised by laminating | stacking so that it may shift repeatedly in shape. Here, the rolling direction of the grain-oriented electrical steel sheet is substantially parallel to the direction (longitudinal direction of the yoke portions 621 and 622) along the long side (longitudinal direction) of the rectangle (the yoke constituent portion 621a of FIG. 8). ~ 621c, see double arrow lines shown in 622a-622c).

  In FIG. 8A, a plurality of directional electromagnetic steel plates stacked in this manner are shown as directional electromagnetic steel plate groups 801 to 806, respectively. The plurality of directional electromagnetic steel plates constituting the yoke construction portions 621a to 621c and 622a to 622c have a bending angle of approximately 60 ° at a position that matches the bending position of the yoke construction portions 621a to 621c and 622a to 622c It is bent to As shown in FIGS. 7 (a) and 7 (b), the length in the longitudinal direction of the plurality of directional electromagnetic steel sheets constituting the yoke components 621a to 621c and 622a to 622c is the inner circumference of the pile core 600. The outer peripheral side (the back side than the front side of the paper surface of FIG. 8A) is longer than the side. The yoke component portions 621a to 621c and 622a to 622c are configured such that when the directional electromagnetic steel plates are stacked so that the bending positions are mutually fitted, the positions of the longitudinal ends of the stacked directional magnetic steel plates are aligned. The longitudinal length, the bending position, and the position of the triangular recessed portion are determined.

  As shown to Fig.8 (a), the legs 211-213 are a position of the direction (longitudinal direction of the legs 211-213) along the longest side of the hexagon concerned with a plurality of hexagonal directional electromagnetic steel plates. Are stacked in a stepwise manner so as to be repeatedly displaced. Here, the rolling direction of the grain-oriented electrical steel sheet is substantially parallel to the direction (longitudinal direction of the legs 211 to 213) along the longest side (longitudinal direction) of the hexagon (the leg of FIG. 8A) See the double arrow lines shown in sections 211-213).

  In FIG. 8A, a plurality of directional electromagnetic steel plates stacked in this manner are shown as directional electromagnetic steel plate groups 807 to 809, respectively. The lengths in the longitudinal direction of the plurality of hexagonal directional electromagnetic steel plates constituting the legs 211 to 213 are the same and are not bent.

A stacked iron core 600 is configured by step-lap bonding the directional electromagnetic steel sheet groups 801 to 809 configured in this manner.
In the example shown in FIG. 8, one end in the longitudinal direction of the directional electromagnetic steel plate group 801 constituting the yoke component portion 621a and one end in the longitudinal direction of the directional electromagnetic steel plate group 802 constituting the yoke component portion 621b are steps. Wrap jointed. In addition, the other end in the longitudinal direction of the directional electromagnetic steel plate group 802 forming the yoke construction portion 621b and the one end in the longitudinal direction of the directional electromagnetic steel plate group 803 forming the yoke construction portion 621c are step-lap bonded . Further, the other end in the longitudinal direction of the directional electromagnetic steel plate group 803 constituting the yoke construction portion 621c and the other end in the longitudinal direction of the directional electromagnetic steel plate group 801 constituting the yoke construction portion 621a are step-lap joined Ru. Further, one end in the longitudinal direction of the directional electromagnetic steel plate group 807 constituting the leg portion 211 and a recessed portion in the lower end in the longitudinal center of the directional electromagnetic steel plate group 801 constituting the yoke construction portion 621a are steps. Wrap jointed. Further, one end in the longitudinal direction of the directional electromagnetic steel plate group 808 constituting the leg portion 213, and a recessed portion in the lower end in the longitudinal central portion of the directional electromagnetic steel plate group 802 constituting the yoke construction portion 621b are steps. Wrap jointed. In addition, one end in the longitudinal direction of the directional electromagnetic steel plate group 809 constituting the leg portion 212 and a recessed portion in the lower end in the longitudinal center of the directional electromagnetic steel plate group 803 constituting the yoke construction portion 621c are steps. Wrap jointed. As in the case of the yoke components 221a to 221c, the step parts of the yoke components 222a to 222c and the legs 211 to 213 and two yoke components disposed adjacent to the yoke component are connected to the step-lap joint. Be done.

  FIG. 9 is a view showing a second example of the state in which the piled iron core 600 is developed. FIG. 9A is a developed view of the region of the inner peripheral surface of the pile core 600. As shown in FIG. FIG. 9B is a developed view of a region on the upper surface of the pile core 600 (a region of the pile core 600 when viewed from the positive direction of the Z-axis toward the negative direction). FIG. 9C is a developed view of a region on the lower surface of the pile core 600 (a region of the pile core 600 when viewed from the negative direction of the Z-axis toward the positive direction). In FIG. 9 as well as FIG. 8, the number of laminated directional electromagnetic steel sheets is different from that in FIG. 2 for convenience of description. Moreover, in FIG. 9 (a), a broken line shows the outline of the directionality electromagnetic steel plate in the back side (the positive direction side of the Y-axis) of the directionality steel plate of the outermost surface.

  As shown in FIGS. 9A to 9C, the yoke component parts 621a to 621c and 622a to 622c of the yoke parts 621 and 622 are longitudinal ends of the leg parts 211 to 213 with respect to a rectangle. The end of the direction (longitudinal direction of the yoke portions 621 and 622) along the long side (longitudinal direction) of the rectangle has a first end. It is comprised by laminating | stacking so that it may be arrange | positioned by two positions of a position and a 2nd position alternately. Here, the rolling direction of the grain-oriented electrical steel sheet is substantially parallel to the direction (longitudinal direction of the yoke portions 621 and 622) along the longest side (longitudinal direction) of the rectangle (the yoke component shown in FIG. 9) 621a to 621c, 622a to 622c, see the double arrow lines).

  In FIG. 9A, a plurality of directional electromagnetic steel plates stacked in this manner are shown as directional electromagnetic steel plate groups 901 to 906, respectively. The plurality of directional electromagnetic steel plates constituting the yoke construction portions 621a to 621c and 622a to 622c have a bending angle of approximately 60 ° at a position that matches the bending position of the yoke construction portions 621a to 621c and 622a to 622c It is bent to As shown in FIGS. 7 (a) and 7 (b), the length in the longitudinal direction of the plurality of directional electromagnetic steel sheets constituting the yoke components 621a to 621c and 622a to 622c is the inner circumference of the pile core 600. The outer peripheral side (the back side than the front side of the paper surface of FIG. 9A) is longer than the side. The yoke component portions 621a to 621c and 622a to 622c are configured such that when the directional electromagnetic steel plates are stacked so that the bending positions are mutually fitted, the positions of the longitudinal ends of the stacked directional magnetic steel plates are aligned. The lengths in the longitudinal direction of the plurality of oriented electromagnetic steel sheets are determined.

  As shown to Fig.9 (a), the legs 211-213 are the direction (the length of the legs 211-213 along the longest side (longitudinal direction) of the hexagon of a plurality of hexagonal directional electromagnetic steel sheets. It is constructed by laminating so that the end of the direction is alternately arranged at two positions of the first position and the second position. Here, the rolling direction of the grain-oriented electrical steel sheet is substantially parallel to the direction (longitudinal direction of the legs 211 to 213) along the longest side (longitudinal direction) of the hexagon (the leg of FIG. 9A) See the double arrow lines shown in sections 211-213).

  In FIG. 9A, a plurality of directional electromagnetic steel sheets stacked in this manner are shown as directional electromagnetic steel sheet groups 907 to 909, respectively. The lengths in the longitudinal direction of the plurality of hexagonal directional electromagnetic steel plates constituting the legs 211 to 213 are the same and are not bent.

A pile iron core 600 is configured by alternately lap-joining the directional electromagnetic steel plate groups 901 to 909 configured as described above.
In the example shown in FIG. 9, in the method of joining the directional electromagnetic steel plate groups 901 to 909, in the description of the method of joining the directional electromagnetic steel plate groups 801 to 809 described above, reference numerals 801 to 809 are 901 to 909, and The lap joint is replaced with an alternate lap joint. Therefore, the detailed description of the method of joining the directional electromagnetic steel plate groups 901 to 909 is omitted.
As described in the first embodiment, the step wrap junction and the alternate wrap junction itself can be realized by known techniques, and as a method of the step wrap junction and the alternate wrap junction, FIGS. Various methods can be adopted other than the indication.

The method of fixing the directional electromagnetic steel sheet groups 401 to 409 is realized, for example, in the same manner as described in the first embodiment.
A piled iron core 600 is configured as described above.

  As described above, the two yoke parts (for example, the yoke parts 621a and 621b) disposed at positions adjacent to each other are two legs (for example, adjacent to each other in the circumferential direction of the pile core 600) The same effect as described in the first embodiment can be obtained even when the joint portion between the leg portions 211 and 213) and the yoke portion (for example, the yoke portion 621) is located at an intermediate position. .

  Also in the present embodiment, as described in the first embodiment, the shape of the cross section of the leg portion is not limited to the square. For example, in the cross section of the leg portion, the length (width) of the directional electromagnetic steel sheet in the plate surface direction may be gradually reduced from the center to the end in the stacking direction of the directional electromagnetic steel sheet. In addition, if the center of gravity of the three legs is located at substantially the same position as the apex of the triangle whose center of gravity is at the center of the pile core in the cross section of the three legs, the triangle is necessarily approximately the same. It does not have to be an equilateral triangle.

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

  200, 600, 600: piled iron core, 211 to 213, 511 to 513: legs, 221 to 222, 621 to 622: yoke portions, 221a to 221c, 222a to 222c, 621a to 621c, 622a to 622c: yoke Component parts, 231a to 231c, 232a to 232c, 631a to 631c, 632a to 632c: joints, 310, 320, 330, 510, 520, 530: coil groups, 301 to 309, 301 to 409, 801 to 809, 901 ~ 909: Directional electromagnetic steel sheet group

Claims (15)

It has a plurality of stacked soft magnetic plates, has three legs having substantially the same configuration, has a plurality of stacked soft magnetic plates, and has two yoke portions having substantially the same configuration. A pile core in a state where the three legs and the two yokes are magnetically coupled,
Each of the three legs extends in the height direction of the pile core,
In the cross sections of the three legs, the positions of the axes of the three legs are substantially the same as the positions of the apexes of triangles whose positions of the axes of the pile cores are the positions of the centers of gravity;
The surface of the soft magnetic material plate constituting the three legs is substantially perpendicular to the direction in which a virtual line connecting the center of gravity of the triangle and the apex of the triangle in which the legs are located is extended. The soft magnetic material plates constituting the three legs are in a laminated state so as to face the direction,
The soft magnetic material plate constituting the yoke portion is in a bent state at at least one place,
Of the two yoke parts, one of the yoke parts is in a state of being joined to a region of one end of the three legs in the longitudinal direction, and the other of the yoke parts is the one of the three yoke parts. Joined with the area of the other longitudinal end of the two legs,
A pile core characterized in that, in a region where the yoke portion and the leg portion are joined, laminating directions of soft magnetic material plates forming the yoke portion and the leg portion are substantially the same. The yoke portion has a shape that orbits around an axis of the pile core,
The pile iron core according to claim 1, wherein a shape of the yoke portion is a hollow triangular prism.   The pile iron core according to claim 1, wherein the shape of the yoke portion is a hollow n-shaped prism in which n is an integer of a multiple of 3 or more of six or more.   The pile core according to claim 3, wherein the n-prism is a substantially positive n-prism. The yoke has three yoke components of substantially the same configuration,
The yoke component includes a plurality of stacked soft magnetic material plates,
The said yoke construction part is a state mutually joined with the other said yoke construction part in the direction which goes around the axis of the said pile core. The piled iron core described in Section.   The coordinates on the imaginary plane perpendicular to the axis of the core of the joint of the two yoke parts arranged adjacent to each other are virtual that are perpendicular to the axis of the core of the leg. The pile iron core according to claim 5, being in a state included in coordinates on a plane.   The coordinates on the imaginary plane perpendicular to the axis of the core of the joint of the two yoke parts arranged adjacent to each other are virtual that are perpendicular to the axis of the core of the leg. A pile core according to claim 5, characterized in that it is not included in the coordinates on the plane, but is in the area between the junctions of the two legs and the yoke.   A soft magnetic plate constituting the yoke component, and a soft magnetic plate constituting another yoke component adjacent to the yoke component in a direction around the axis of the pile core The stator core according to any one of claims 5 to 7, which is in a state of being joined by a step lap joint or an alternate lap joint.   In the cross sections of the three legs, the positions of the axes of the three legs are substantially the same as the positions of the vertices of a substantially equilateral triangle whose center of gravity is the position of the axis of the pile core. The pile core according to any one of claims 1 to 8, wherein   The soft magnetic material plate constituting the leg portion and the soft magnetic material plate constituting the yoke portion are in a state of being joined by step lap bonding or alternate lap bonding. The pile core according to any one of the above.   The cross section of the said leg part WHEREIN: The length of the plate surface direction of the soft-magnetic material board which comprises the said leg part is substantially the same, The product in any one of Claims 1-10 characterized by the above-mentioned Iron core.   In the cross section of the leg, the length of the soft magnetic plate in the plate surface direction in the direction perpendicular to the stacking direction of the soft magnetic plates constituting the leg is the soft magnetic plate constituting the leg The pile iron core according to any one of claims 1 to 10, wherein the pile iron core becomes smaller stepwise from the center to the end in the lamination direction of the pile.   The ratio of the iron loss value in the bent region of the soft magnetic plate to the iron loss value in the other region of the soft magnetic plate is 1.5 or less. The pile core according to any one of the above.   The piled iron core according to any one of claims 1 to 13, wherein the soft magnetic material plate is a magnetic steel plate. An electrical device to which three-phase AC power is applied,
A pile core according to any one of claims 1 to 14,
And a coil wound around the legs.

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