JP6848314B2 - Stator core and rotary electric machine - Google Patents

Description

The present invention relates to a stator core and a rotary electric machine, and is particularly suitable for use in laminating a plurality of magnetic material plates to form a stator core.

The rotary electric machine has a rotor (rotor) and a stator (stator). The stator has a stator core and windings. The stator core has an annular yoke portion (core back portion) extending in the circumferential direction and a plurality of stator cores extending in the direction from the inner peripheral surface of the yoke portion toward the axis and arranged at intervals in the circumferential direction. It has a teeth part. Such a stator core is formed by laminating magnetic steel plates such as electrical steel sheets. The surface of the magnetic plate is coated with an insulator (insulating film).

When forming the stator core, a plurality of magnetic material plates punched according to the shape of the stator core are laminated. The plurality of laminated magnetic plates are fixed (connected) by caulking or welding. When such caulking or welding is performed, the coating of the insulating material formed on the plate surface of the magnetic material may be peeled off at the place where the caulking or welding is performed. In this case, the magnetic materials are electrically conductive, and a so-called interlayer short circuit occurs. When an interlayer short circuit occurs at two or more points of the stator core, an eddy current flows through the stator core, and the Joule loss (eddy current loss) based on the eddy current increases the loss of the stator core. As a result, the output efficiency of the rotary electric machine may decrease.

Patent Document 1 discloses that the positions of the caulking formed on a plurality of laminated magnetic plates in the circumferential direction of the core back portion are alternately switched a plurality of times in the stacking direction. Further, Patent Document 1 discloses that a hole in which a protrusion formed by caulking is inserted is formed in a magnetic plate arranged at a switching position. Further, Patent Document 1 discloses that a slit extending from the outer periphery of the core back portion toward the teeth portion is formed between the caulking portion and the hole portion in the circumferential direction of the core back portion. According to the description of Patent Document 1, it is said that the eddy current loss of the stator core can be reduced by lengthening the path of the eddy current flowing through the stator core due to the interlayer short circuit as described above.

JP 2015-142424

However, in the technique described in Patent Document 1, the path of the eddy current becomes extremely long. Therefore, the distribution of the magnetic flux inside the stator core may be extremely biased. Therefore, there is a risk that the total loss of the stator core cannot be reduced. Further, it is necessary to manufacture a magnetic plate having a different caulking position or a magnetic plate having holes and slits formed therein. That is, it is necessary to manufacture a plurality of types of magnetic plates. Therefore, there is a risk that the manufacturing process of the stator core will increase. Further, a protrusion formed by caulking is inserted into the hole. Therefore, at the portion where the protrusion is inserted into the hole, the fixing force may be weaker than that of the normal caulking.
The present invention has been made in view of the above problems, and it is possible to reduce the eddy current loss due to the interlayer short circuit of the stator core with a simple configuration and suppress the decrease in the output efficiency of the rotary electric machine. The purpose is to do.

The stator core of the present invention has an annular yoke portion extending in the circumferential direction and an annular yoke portion extending in the direction from the inner peripheral surface of the yoke portion toward the axial core, and is arranged at a distance from each other in the circumferential direction. A stator core having a plurality of teeth portions, wherein the yoke portion and the plurality of teeth portions have a plurality of magnetic material plates laminated so that the plate surfaces are parallel to each other, and the plurality of magnetic plates are provided. body plate has a plurality of coupling portion coupling the plurality of magnetic plates to each other, have a high resistance region in the realm of the magnetic plate, the electrical resistivity of the high resistance region, the magnetic higher than the electrical resistivity of the body plate, the high resistance region, Ri region der present from one end face of the direction along the axis of the stator core to the other end face, the plurality of connecting portions, the yoke portion The high resistance region includes at least the connecting portion formed in the yoke portion and the connecting portion formed in the teeth portion, including the formed connecting portion and the connecting portion formed in the teeth portion. characterized that you have formed between.

According to the present invention, it is possible to reduce the eddy current loss due to the interlayer short circuit of the stator core with a simple configuration and suppress the decrease in the output efficiency of the rotary electric machine.

FIG. 1 is a diagram showing a first example of the configuration of a rotary electric machine. FIG. 2 is a diagram showing a part of a normal stator core in the circumferential direction. FIG. 3 is a diagram showing an example of the relationship between the cross-sectional interlinkage magnetic flux density and time. FIG. 4 is a diagram showing an example of the ratio to the induced electromotive force, the interlayer short circuit loss, the stator loss, and the stator iron loss in a table format. FIG. 5 is a diagram showing a first example of hole arrangement. FIG. 6A is a diagram showing a first modification of the hole. FIG. 6B is a diagram showing a second modification of the hole. FIG. 7 is a table showing an example of an interlayer short-circuit loss when there is no hole, when the hole has a horizontally long shape, and when the hole has a vertically long shape. FIG. 8 is a diagram showing a second example of the configuration of the rotary electric machine. FIG. 9 is a diagram showing a second example of hole arrangement. FIG. 10 is a diagram showing a third example of the configuration of the rotary electric machine. FIG. 11 is a diagram showing a third example of hole arrangement. FIG. 12 is a diagram showing a fourth example of the configuration of the rotary electric machine. FIG. 13 is a diagram showing a fifth example of the configuration of the rotary electric machine. FIG. 14 is a diagram showing a fourth example of hole arrangement.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In each figure, for convenience of explanation, illustration of parts not necessary for explanation is omitted, and the configuration of the illustrated parts is simplified.
(First Embodiment)
First, the first embodiment will be described.
FIG. 1 is a diagram showing an example of the configuration of the rotary electric machine of the present embodiment. FIG. 1A is a view of the rotary electric machine 100 as viewed along the extension direction of the rotary shaft 130. FIG. 1 (b) is a sectional view taken along line II of FIG. 1 (a). The rotary electric machine 100 may be an electric motor or a generator.

The rotary electric machine 100 has a stator 110 and a rotor 120.
In the example shown in FIG. 1, the rotor 120 has four magnets 121a to 121d and a plurality of electromagnetic steel sheets 122 laminated in the axial direction of the rotary electric machine 100, and the magnets 121a to 121d are the rotary electric machines. They are arranged at 90 degree intervals in the circumferential direction of 100. The rotor is not limited to the one shown in FIG. 1, and various known structures can be adopted. Therefore, detailed description thereof will be omitted here.

The stator 110 has a stator core 111 and windings and cases (not shown). The stator core 111 is arranged so that its shaft core substantially coincides with the shaft core of the rotating shaft 130. The stator core 111 has a yoke portion (core back portion) 112 and a plurality of tooth portions 113a to 113l. The yoke portion 112 is an annular portion extending in the circumferential direction of the rotary electric machine 100. The plurality of tooth portions 113a to 113l are portions extending from the inner peripheral surface of the yoke portion 112 toward the axis (direction in which the rotation shaft 130 is located), respectively. The plurality of tooth portions 113a to 113l are arranged at intervals from each other in the circumferential direction of the rotary electric machine 100. Although not shown in FIG. 1, the plurality of tooth portions 113a to 113l are wound by concentrated winding. The windings applied to the plurality of tooth portions 113a to 113l are not limited to those by concentrated winding, and may be by distributed winding. Further, although not shown in FIG. 1, the rotary electric machine 100 has a case. The case is arranged so that the inner peripheral surface of the case and the outer peripheral surface of the stator core 111 face each other, and fitting processing (for example, shrink fitting) between the stator core 111 and the case is performed. In the following description, the circumferential direction of the rotary electric machine 100 is abbreviated as the circumferential direction as necessary, and the radial direction of the rotary electric machine 100 is abbreviated as the radial direction as necessary, and the extension direction (axis) of the rotary electric shaft 130 is used. The direction along the axis) is referred to as the axial direction as necessary.

As shown in FIG. 1 (b), the stator core 111 is configured by using a plurality of magnetic plates. The plurality of magnetic plates are laminated so that the plate surfaces are parallel to each other along the axial direction. The surface of the magnetic plate is coated with an insulating material (insulating coating). In the present embodiment, the case where the magnetic material plate is an electromagnetic steel plate will be described as an example. As shown in FIG. 1A, holes 114a to 114l are formed in the stator core 111. An electromagnetic steel plate constituting the stator core 111 is formed by punching a base material (electrical steel plate) so as to match the shapes of the yoke portion 112, the plurality of tooth portions 113a to 113l, and the holes 114a to 114l. To. In the present embodiment, the case where the electromagnetic steel plates constituting the stator core 111 all have the same shape and size will be described as an example.

The plurality of electrical steel sheets thus obtained are crimped in a state of being laminated so that the positions corresponding to the yoke portions 112, the teeth portions 113a to 113l, and the holes 114a to 114l are aligned with each other. By caulking the plurality of electrical steel sheets in this way, the holes 114a to 114l penetrate the stator core 111 in the stacking direction (axial direction) of the plurality of electrical steel sheets.

Further, by crimping the plurality of electromagnetic steel sheets, the plurality of electromagnetic steel sheets are connected to each other. By crimping the electrical steel sheet, a protrusion is formed on one surface of the electrical steel sheet, and a recess is formed on the other surface so that the front and back surfaces are integrated. By fitting the protrusions of the electrical steel sheet and the recesses of the electrical steel sheet adjacent to the electrical steel sheet, the plurality of electrical steel sheets are connected to each other. In the following description, the protrusions and recesses formed on the plate surface by caulking will be referred to as caulking portions, if necessary. The caulking portion is an example of a connecting portion that mechanically connects a plurality of electromagnetic steel plates. The number, position, and shape of the crimped portion are not particularly limited as long as a plurality of electromagnetic steel plates can be connected. In the present embodiment, as shown in FIG. 1A, a case where the caulked portions 115a to 115r are formed is shown as an example.

Here, the process leading to the formation of the holes 114a to 114l will be described.
FIG. 2 is a diagram showing a part (about 30 [°] minutes) of the stator core in the circumferential direction. FIG. 2 is a diagram corresponding to a region in the vicinity of the teeth portion 113a in FIG. 1 (a). However, the stator core shown in FIG. 2 does not have holes 114a to 114l formed in the stator core 111 shown in FIG. 1A. Other configurations of the stator core shown in FIG. 2 are the same as the configuration of the stator core 111 shown in FIG. 1 (a). In the following description, such a stator core (a stator core in which holes 114a to 114l are not formed) will be referred to as a normal stator core, if necessary.

The present inventors have decided to calculate the loss when an interlayer short circuit occurs in the caulked portions 115a to 115c. Therefore, first, the relationship between the magnetic flux density inside the normal stator core and the crimped portions 115a to 115c was investigated. Specifically, in FIG. 2, among the magnetic flux densities interlinking the cross sections obtained by cutting the virtual lines 210a connecting the positions of the centers of gravity of the crimped portions 115a and 115b along the axial direction, the cross section is included in the cross section. The relationship between the magnetic flux density (hereinafter referred to as "first cross-sectional interlinkage magnetic flux density") of orthogonal magnetic fluxes (see the white arrow line in FIG. 2) and time was determined by numerical analysis. Similarly, among the magnetic flux densities intersecting the cross sections of the virtual lines 210b connecting the positions of the centers of gravity of the crimped portions 115a and 115c along the axial direction, the magnetic flux orthogonal to the cross section (white in FIG. 2). The relationship between the magnetic flux density (hereinafter referred to as "second cross-sectional interlinkage magnetic flux density") of (see the drawn arrow line) and time was obtained by numerical analysis. The result is shown in FIG. The position of the center of gravity of the crimped portion is defined by the contour of the crimped portion region when the crimped portion is viewed along the direction perpendicular to the plate surface of the electromagnetic steel plate (that is, when the crimped portion is viewed in a plane). Refers to the position of the center of gravity of the plane (this is the same in other explanations). Here, the crimped portions 115b and 115c are in axially symmetric positions about a straight line passing through the position of the center of gravity of the crimped portion 115a and the position of the axial core of the rotary electric machine 100. Therefore, theoretically, the relationship between the first cross-sectional interlinkage magnetic flux density and time and the relationship between the second cross-sectional interlinkage magnetic flux density and time are the same. Therefore, in the following description, the first cross-section interlinkage magnetic flux density and the second cross-section interlinkage magnetic flux density are collectively referred to as the cross-section interlinkage magnetic flux density.

As shown in FIG. 3, the cross-sectional interlinkage magnetic flux density changes with time. Due to the time change of the cross-sectional interlinkage magnetic flux density, an induced electromotive force is generated inside the normal stator core and an eddy current flows. This eddy current causes eddy current loss in a normal starter core. As described in the background technology section, this eddy current is generated by caulking, causing an interlayer short circuit at two or more points of the stator core 111 and forming a path through which the eddy current flows. In the following description, this eddy current loss will be referred to as an interlayer short circuit loss, if necessary.

Next, the present inventors calculate the induced electromotive force generated inside the normal stator core when excited at each excitation frequency, and use the calculated induced electromotive force and the electrical resistivity of the electromagnetic steel plate to make layers between layers. The short circuit loss was calculated. FIG. 4 shows the results in tabular form. In FIG. 4, the stator iron loss is the total iron loss of a normal stator core when excited at each excitation frequency. The ratio to the stator iron loss is the ratio of the interlayer short-circuit loss to the stator iron loss expressed as a percentage. As shown in FIG. 4, the interlayer short-circuit loss is 9 to 39 [%] with respect to the stator loss, and it can be seen that the loss affects the stator loss. Therefore, the interlayer short-circuit loss is a factor that increases the loss of the rotary electric machine and lowers the output efficiency of the rotary electric machine.

From the above findings, the present inventors have come up with the idea that in order to suppress the interlayer short-circuit loss, it is necessary to electrically cut off a part of the path through which the eddy current flows. In order to electrically block a part of the path through which the eddy current flows, it is preferable to electrically insulate that part. Therefore, as shown in FIG. 1, for example, holes 114a and 114b are formed in the region between the caulking portions 115a and 115b and the region between the caulking portions 115a and 115c, respectively. In this way, the holes 114a and 114b (air inside the holes) can block the eddy currents flowing between the crimped portions 115a and 115b and between the crimped portions 115a and 115c, respectively. Here, the holes 114a and 114b are formed so as to penetrate the stator core 111. This is because if the holes 114a and 114b do not penetrate the stator core 111, the portion where the holes 114a and 114b are not formed can be a path for eddy currents.

Further, holes may be formed in the region between the crimped portions 115b and 115c in the same manner as the holes 114a and 114b to block the eddy current flowing between the crimped portions 115b and 115c. However, the positions of the crimped portions 115b and 115c in the radial direction are the same. Therefore, among the magnetic flux densities cross-sections obtained by cutting the virtual lines 210c connecting the positions of the centers of gravity of the crimped portions 115b and 115c along the axial direction, the magnetic flux orthogonal to the cross-section is small. Therefore, even if an interlayer short circuit occurs in the crimped portions 115b and 115c, the eddy current generated by this magnetic flux is small. Further, the magnetic flux density of the yoke portion 112 in the circumferential direction is high. Therefore, if a hole is formed in the region between the crimped portions 115b and 115c, the magnetic flux flowing in the circumferential direction of the yoke portion 112 may be hindered by the hole. From the above, it is preferable not to form a hole in the region between the caulking portions 115b and 115c, and as shown in FIG. 1A, also in the present embodiment, the region between the caulking portions 115b and 115c is formed. Does not form a hole.

On the other hand, it is preferable to form a hole in the region between two caulked portions having different positions in the radial direction. However, when the distance between the two caulked portions having different positions in the radial direction is long, the path of the eddy current flowing between the two caulked portions also becomes long. Therefore, even if the region is between two caulked portions having different positions in the radial direction, if the distance between the two caulked portions is long, no hole is formed in the region between the two caulked portions. Is preferable. For example, when the circumferential distance between these two caulked portions exceeds the circumferential length of the stator core 111 at the radial center position of the yoke portion 111 divided by the number of slots of the stator core 111, these 2 It is preferable that no holes are formed in the region between the two crimped portions (in other words, the circumferential distance between the two crimped portions is the circumferential length of the stator core 111 at the radial center position of the yoke portion 111. When the length is equal to or less than the length divided by the number of slots of the stator core 111, it is preferable to form a hole in the region between these two caulked portions).
The above is the same for the other caulking portions 115d to 115r. Therefore, as shown in FIG. 1, holes 114c to 114l are formed in the stator core 111 of the present embodiment.

Next, an example of the arrangement of the holes 114a to 114l will be described. FIG. 5 is a diagram showing an example of arrangement of holes 114a and 114b. Specifically, FIG. 5A is a diagram showing a part (about 30 [°] minutes) of the stator core in the circumferential direction, and is a diagram showing a region near the teeth portion 113a extracted from FIG. 1A. is there. 5 (b) is a cross-sectional view taken along the line II of FIG. 5 (a).

As described above, in the present embodiment, the holes 114a and 114b are formed in the region between the caulking portions 115a and 115b and the region between the caulking portions 115a and 115c, respectively. Specifically, the hole 114a is arranged so that a part of the virtual line 511 connecting the position 501 of the center of gravity of the caulking portion 115a and the position 502 of the center of gravity of the caulking portion 115b is included inside the hole 114a. Is preferable. Similarly, it is preferable to arrange the hole 114b so that a part of the virtual line 512 connecting the position 501 of the center of gravity of the caulking portion 115a and the position 503 of the center of gravity of the caulking portion 115c is included inside the hole 114b. .. That is, the center of the eddy current path flowing between the caulked portions 115a and 115b and between the caulked portions 115a and 115c (when the holes 114a and 114b are not formed) is blocked by the holes 114a and 114b. It is preferable to do so. In the following description, it is necessary to arrange the hole so that a part of the virtual line connecting the positions of the centers of gravity of the two caulked portions is included in the inside of the hole. It is called.

Then, from the viewpoint of blocking the entire path of the eddy current flowing between the caulking portions 115a and 115b and between the caulking portions 115a and 115c (when the holes 114a and 114b are not formed), the following is performed. Is preferable.
That is, a part of the first virtual line 531 connecting the first end point 521 of the caulking portion 115a and the first end point 522 of the caulking portion 115b to each other, the second end point 523 of the caulking portion 115a, and the caulking portion 115a. The hole 114a is arranged so that a part of the second virtual line 532 connecting the second end point 524 of the portion 115b to each other is included in the inside or the edge of the hole 114a.
Similarly, a part of the first virtual line 533 connecting the first end point 525 of the caulking portion 115a and the first end point 526 of the caulking portion 115c to each other, the second end point 527 of the caulking portion 115a, and the like. The hole 114b is arranged so that a part of the second virtual line 534 connecting the second end point 527 of the caulking portion 115c to each other is included in the inside or the edge of the hole 114b.
In the following description, a part of a first virtual line connecting a first end point of a certain caulking part and a first end point of another caulking part to each other, and a second end point of the certain caulking part. And, if necessary, arrange the hole so that a part of the second virtual line connecting the other crimped portion with the second end point is included in the inside or the edge of the hole. This is referred to as the second arrangement condition of the holes.

Here, the end points of the crimped portion are points on the contour of the region of the crimped portion when the crimped portion is viewed along the direction perpendicular to the plate surface of the electromagnetic steel plate (that is, when the crimped portion is viewed in a plan view). (This is the same in other explanations). Further, the first virtual line 531 (533) and the second virtual line 532 (534) are virtual lines connecting any end point of the caulking portion 115a and any end point of the caulking portion 115b (115c) to each other. The area of the area surrounded by the line, the virtual line connecting the other end points of the caulking portion 115a and the other end points of the caulking portion 115b (115c) to each other, and the caulking portions 115a, 115b (115a, 115c) is the maximum. It is the virtual line when becomes. Here, the first virtual line 531 (533) is formed from the two curved portions 561 and 562 formed at the connecting portion between the end surfaces 551 and 552 of the teeth portion 113a in the circumferential direction and the inner peripheral surfaces 571 and 572 of the yoke portion 112. If there is a portion of the first virtual line 531 (533) that passes outside the stator core 111 and does not pass through the region of the stator core 111, the third virtual line is replaced with the first virtual line 531 (533). Is adopted.

The third virtual line crosses the first end point 521 of the caulking portion 115a, the first end point 522 of the caulking portion 115b, and the point of the curved portion 561 so as not to pass through the regions of the caulking portions 115a and 115b, respectively. It becomes a virtual line connecting the first end point 525 of the caulking portion 115a, the first end point 526 of the caulking portion 115c, and the point of the curved portion 562, respectively. As described above, the third virtual line is not a straight line but a bending line (see the third virtual lines 611 to 622 of FIGS. 6A and 6B described later). Here, there are two curved parts 561 and 562 as candidates for the curved portion located at the bending point of the third virtual line, and the curved portion located at the bending point of the third virtual line is these two songs. Of the parts 561 and 562, the curved part is closer to the first virtual line 531 and 532 replaced by the third virtual line. For example, in FIG. 6A described later, the first virtual line replaced by the third virtual line 611 is a first virtual line connecting the lower left apex of the caulking portion 115a and the lower left apex of the caulking portion 115b to each other. is there. Therefore, of the curved portions 561 and 562, the curved portion 561 having a short distance from the first virtual line is the curved portion located at the bending point of the third virtual line 611. Similarly, the first virtual line replaced by the third virtual line 612 is the first virtual line connecting the lower right apex of the caulking portion 115a and the lower right apex of the caulking portion 115c to each other. Therefore, of the curved portions 561 and 562, the curved portion 562 having a short distance from the first virtual line is the curved portion located at the bending point of the third virtual line 612. Further, the points of the curved portions 561 and 562 are points at predetermined positions in the region of the curved portions 561 and 562 when the curved portions 561 and 562 are viewed along the direction perpendicular to the plate surface of the electromagnetic steel plate. .. The predetermined position is, for example, a position on the curved portions 561 and 562 where the radius of curvature is maximized when the curved portions 561 and 562 have a curvature, and the curved portions 561 and 562 are bent. In the case, it is the bent position.

In FIG. 5B, the holes 114a and 114b are through holes of the stator core 111 penetrating from one end surface 541 to the other end surface 542 in the axial direction. Specifically, in the example shown in FIG. 5B, the holes 114a and 114b are through holes that penetrate the stator core 111 in the axial direction. The holes 114a and 114b are voids, and nothing is arranged.

Further, as long as the stator core 111 is penetrated in the above arrangement, the shape, position, and size of the holes are not limited to those shown in FIG. 6A and 6B show examples of deformation of the holes. (A) to (c) of FIG. 6A and (a) to (b) of FIG. 6B are first to fifth modified examples of the holes, and are views corresponding to FIG. 5 (a).
In the example shown in FIG. 5, holes 114a and 114b were formed at the boundary between the yoke portion 112 and the teeth portion 113a. However, as shown in FIG. 6A (a), holes 601 and 602 may be formed in the teeth portion 113a. Further, as shown in FIG. 6A (b), holes 603 and 604 may be formed in the yoke portion 112.

Further, in the example shown in FIG. 5, holes 114a and 114b were individually formed between the crimped portions 115a and 115b and between the crimped portions 115a and 115c, respectively. However, as shown in FIG. 6A (c), one hole 605 may be formed between the crimped portions 115a and 115b and between the crimped portions 115a and 115c.

Further, in the example shown in FIG. 5, the directions of the long sides of the rectangular holes 114a and 114b are set to be along the radial direction. However, as shown in FIG. 6B (a), the long sides of the rectangular holes 606 and 607 may be set in the circumferential direction, and the holes 606 and 607 may be formed in the yoke portion 112. Further, as shown in FIG. 6B, the long sides of the rectangular holes 608 and 609 may be set in the circumferential direction, and the holes 608 and 609 may be formed in the teeth portion 113a. Although not shown, the long side of the rectangular hole may be set in the circumferential direction, and the hole may be formed at the boundary between the yoke portion 112 and the teeth portion 113a.

In addition, the shape of the hole does not have to be rectangular as shown in FIG. 5A, FIG. 6A and FIG. 6B. For example, the shape of the hole may be a parallelogram having sides parallel to the first virtual line 531 (533) and the second virtual line 532 (534). In addition, the shape of the hole may be a circle or an ellipse. Further, holes may be arranged at the positions of the curved portions 561 and 562. If the holes are arranged near the curved portions 561 and 562, the gap between the curved portions 561 and 562 and the holes becomes small, and the distribution of the magnetic flux density may be greatly biased. Therefore, if the holes are arranged near the curved portions 561 and 562, it is preferable to arrange the holes in the curved portions 561 and 562. In this case, since the curved portion becomes the edge of the hole, a part of the third virtual line passes through the edge of the hole.

The arrangement of the other holes 114c to 114l can be determined in the same manner as the arrangement of the holes 114a and 114b described above. Therefore, detailed description of the arrangement of the other holes 114c to 114l will be omitted here.

In addition, the present inventors have verified how the interlayer short-circuit loss changes depending on the presence or absence of holes. The result is shown in FIG. Similar to the result shown in FIG. 4, the induced electromotive force generated inside the stator core when excited at each excitation frequency is calculated, and the calculated induced electromotive force and the electrical resistivity of the electromagnetic steel plate are used to generate an interlayer short-circuit loss. Was calculated. In FIG. 7, “none” indicates the result for a normal stator core without holes (ie, the result shown in FIG. 4). The "vertical shape" indicates that, as shown in FIGS. 5 and 6A, the shape of the hole is the result of a rectangular stator core in which the direction of the long side is along the circumferential direction. Further, the "horizontally elongated shape" indicates that, as shown in FIG. 6B, the shape of the hole is a result for a stator core having a rectangular shape in which the direction of the long side is along the radial direction. Other than this, it is assumed that the "horizontally elongated" hole and the "vertically elongated" hole have the same conditions. In addition, the conditions other than the holes are the same for "none", "horizontally elongated shape", and "vertically elongated shape". Further, here, the electric resistivity of the hole was calculated as a 10 ⁶ [Ω · m].

As shown in FIG. 7, it can be seen that the interlayer short circuit loss can be reduced by forming holes in the stator core. Further, in the result shown in FIG. 7, the length of the hole crossing the path of the eddy current is longer in the "vertical shape" than in the "horizontal shape". Therefore, the interlayer short-circuit loss can be reduced in the "vertical shape" as compared with the "horizontal shape". In this way, it is preferable to determine the shape of the hole so that the length of the eddy current path becomes long inside the hole. Further, the interlayer short-circuit loss can be increased by increasing the size of the hole, but if the size of the hole is increased too much, the hole hinders the flow of the magnetic flux inside the stator core. From this point of view, the hole size is preferably determined so that the total iron loss of the stator core is reduced.

As described above, in the present embodiment, the region between the caulking portions 115a and 115b and the region between the caulking portions 115a and 115c penetrate from one end surface 541 to the other end surface 542 of the stator core 111 in the axial direction. The holes 114a and 114b are formed. Therefore, when the holes 114a and 114b are not formed, at least a part of the path of the eddy current flowing between the crimped portions 115a and 115b and between the crimped portions 115a and 115c can be blocked. Thereby, the interlayer short circuit loss can be reduced. Further, since the holes 114a and 114b may be formed in the region between the caulking portions 115a and 115b and the region between the caulking portions 115a and 115c, the magnetic flux density inside the stator core 111 is matched to the shape of the stator core 111. The positions and sizes of the holes 114a and 114b can be determined so that the holes 114a and 114b do not have a large bias. Therefore, it is possible to prevent the loss due to the formation of the holes 114a and 114b from becoming large. Further, the electromagnetic steel sheet to be manufactured can be made into one type, and it is not necessary to combine a plurality of types of steel sheets or use a plurality of types of molds. This makes it possible to simplify the manufacturing process of the stator core 111. Further, since the plurality of electromagnetic steel plates constituting the stator core 111 are collectively crimped, the stator core 111 can be reliably connected by caulking.

Here, in the present embodiment, the holes 114a (114b) of the stator core 111 penetrating from one end surface 541 to the other end surface 542 in the axial direction in the region between the two caulking portions 115a, 115b (115a, 115c). That is, the case where a void is formed has been described as an example. However, such holes 114a and 114b are merely an example of a high resistance region formed so as to connect one end face to the other end face of the stator core in the axial direction in the region between the two caulked portions. If such a high resistance region is formed, it is not always necessary to do so. Here, the high resistance region means a region having a higher electrical resistivity than the electrical resistivity of the electromagnetic steel plate constituting the stator core 111, preferably 10 times or more the electrical resistivity of the electromagnetic steel plate constituting the stator core 111. More preferably, it is a region having an electrical resistivity of 100 times or more the electrical resistivity of the electromagnetic steel plate constituting the stator core 111. A material having an electrical resistivity of 10 times or more, preferably 100 times or more of the electrical resistivity of the electromagnetic steel plate constituting the stator core 111 may be arranged in the holes. Examples of such a material include plastics such as bakelite (phenol resin), polymer processed products, and heat-resistant rubber. In this way, the electrical resistivity may be lower than in the case of making a gap, but the rigidity of the stator core can be increased.

Further, the caulking method can be realized by a known method, and the shapes of the caulked portions 115a to 115r are determined according to the caulking method. In the present embodiment, the case where the caulking is a square caulking is shown as an example. However, known caulking such as round flat caulking, round V caulking, square flat caulking, and square V caulking can be adopted. Further, the caulking used in one stator core is not limited to one type, and a plurality of types of caulking may be mixed.

(Second embodiment)
Next, the second embodiment will be described. In the first embodiment, there is an example in which all of the plurality of electrical steel sheets are laminated without shifting in the circumferential direction so that one and the other end faces 551 and 552 of the tooth portion 113a in the circumferential direction are along the axial direction. I mentioned and explained in. On the other hand, in the present embodiment, at least a part of the plurality of electrical steel sheets is staggered and laminated in the circumferential direction, and one and the other end faces in the circumferential direction of the tooth portion have a region inclined with respect to the axial direction ( That is, the case where the stator core has a skew) will be described as an example. As described above, the present embodiment and the first embodiment are mainly different in configuration due to the difference in the method of laminating the plurality of electromagnetic steel sheets. Therefore, in the description of the present embodiment, detailed description of the same parts as those of the first embodiment will be omitted by adding the same reference numerals as those given in FIGS. 1 to 7. There are various methods for providing the skew, but in the present embodiment, the following first and second examples will be described as examples of the stator core having the skew.

<First example>
FIG. 8 is a diagram showing a first example of the configuration of the rotary electric machine of the present embodiment. FIG. 8 is a view of the rotary electric machine 800 as viewed along the axial direction. FIG. 8 is a diagram corresponding to FIG. 1 (a).
The rotary electric machine 800 has a stator 810 and a rotor 120. The stator 810 has a stator core 811. The stator core 811 has a yoke portion (core back portion) 812 and a plurality of tooth portions 813a to 813l. As shown in FIG. 8, holes 814a to 814l are formed in the stator core 811. By punching the base material (magnetic material plate) so as to match the shapes of the yoke portion 812, the plurality of tooth portions 813a to 813l, and the holes 814a to 814l, the magnetic material plate constituting the stator core 811 can be formed. It is formed. The magnetic plates constituting the stator core 811 all have the same shape and size. In this embodiment as well, the case where an electromagnetic steel sheet is used as the magnetic steel plate will be described as an example as in the first embodiment.

FIG. 9 is a diagram showing an example of arrangement of holes 814a and 814b. Specifically, FIG. 9A is a diagram showing a part (about 30 [°] minutes) of the stator core in the circumferential direction, and is a diagram showing a region near the teeth portion 813a extracted from FIG. 9 (b) is a cross-sectional view taken along the line II of FIG. 9 (a).

In the present embodiment, as shown in FIGS. 9A and 9B, the plurality of electromagnetic steel sheets as described above are aligned with the yoke portions 812, and the teeth portions 813a to 813l are aligned. The positions corresponding to the holes 814a to 814l are stacked so as to be displaced in one direction in the circumferential direction (in the example shown in FIG. 9, the direction from the front to the back of the paper surface is on the left side), and the holes are crimped. By crimping the plurality of electromagnetic steel plates in this way, one and the other end faces 951 and 952 of the tooth portion 813a in the circumferential direction have a region inclined with respect to the axial direction. Further, the holes 814a and 814b are through holes of the stator core 811 penetrating from one end surface 941 in the axial direction to the other end surface 942. In the first embodiment, the holes 114a and 114b are through holes penetrating the stator core 111 in the axial direction (see FIG. 5B). On the other hand, in this example, as shown in FIG. 9B, the holes 814a and 814b are through holes that penetrate the stator core 811 in a state of being inclined in one direction with respect to the axial direction. On the other hand, as shown in FIG. 9B by taking the crimped portion 815a as an example, the positions of the crimped portions 815a to 815c in the circumferential direction are the same regardless of the positions in the axial direction.

Also in this example, as in the first embodiment, it is preferable to satisfy the first arrangement condition of the holes described above.
That is, the hole 814a is arranged so that a part of the virtual line 911 connecting the position 901 of the center of gravity of the caulking portion 815a and the position 902 of the center of gravity of the caulking portion 815b is included inside the hole 814a. Similarly, the hole 814b is arranged so that a part of the virtual line 912 connecting the position 901 of the center of gravity of the caulking portion 815a and the position 903 of the center of gravity of the caulking portion 815c is included inside the hole 814b.

Further, it is preferable to satisfy the above-mentioned second arrangement condition.
That is, a part of the first virtual line 931 connecting the first end point 921 of the caulking portion 815a and the first end point 922 of the caulking portion 815b to each other, the second end point 923 of the caulking portion 815a, and the caulking portion 815a. The hole 814a is arranged so that a part of the second virtual line 932 connecting the second end point 924 of the portion 815b to each other is included in the inside or the edge of the hole 814a.
Similarly, a part of the first virtual line 933 connecting the first end point 925 of the caulking portion 815a and the first end point 926 of the caulking portion 815c to each other, the second end point 927 of the caulking portion 815a, and the like. The hole 814b is arranged so that a part of the second virtual line 934 connecting the second end point 927 of the caulking portion 815c to each other is included in the inside or the edge of the hole 814b.

If the first virtual lines 931 and 933 have a portion that does not pass through the region of the stator core 811, it is the first to adopt the third virtual line instead of the first virtual lines 931 and 933. As described in the embodiment.
Further, as shown in FIG. 9B, the distance between the holes 814a to 814l and the caulked portions 815a to 815r changes depending on the position in the axial direction. Therefore, in consideration of this, it is preferable to determine the position, size, and shape of the holes 814a to 814l as in the first arrangement condition or the second arrangement condition described above regardless of the position in the axial direction.

<Second example>
In the first example, one and the other end faces 951 and 952 in the circumferential direction of the tooth portion 813a are inclined in one direction (to the left from the front to the back of the paper surface in FIG. 9) with respect to the axial direction. Indicated. As described above, this is not necessary if one and the other end faces of the teeth portion in the circumferential direction have a region inclined with respect to the axial direction. In this example, a case where one and the other end faces in the circumferential direction of the tooth portion have a region inclined in one direction and a region inclined in the other direction with respect to the axial direction will be described.

FIG. 10 is a diagram showing a second example of the configuration of the rotary electric machine of the present embodiment. FIG. 10 is a view of the rotary electric machine 1000 as viewed along the axial direction. FIG. 10 is a diagram corresponding to FIG. 1 (a).
The rotary electric machine 1000 has a stator 1010 and a rotor 120. The stator 1010 has a stator core 1011. The stator core 1011 has a yoke portion (core back portion) 1012 and a plurality of tooth portions 1013a to 1013l. As shown in FIG. 10, holes 1014a to 1014l are formed in the stator core 1011. An electromagnetic steel plate constituting the stator core 1011 is formed by punching a base material (electrical steel plate) so as to match the shapes of the yoke portion 1012, the plurality of tooth portions 1013a to 1013l, and the holes 1014a to 1014l. To. The electromagnetic steel plates constituting the stator core 1011 all have the same shape and size.

FIG. 11 is a diagram showing an example of arrangement of holes 1014a and 1014b. Specifically, FIG. 11A is a diagram showing a part (about 30 [°] minutes) of the stator core in the circumferential direction, and is a diagram showing a region near the teeth portion 1013a extracted from FIG. 10. 11 (b) is a cross-sectional view taken along the line II of FIG. 11 (a).

In the present embodiment, as shown in FIGS. 11A and 11B, the plurality of electromagnetic steel sheets as described above are aligned with the yoke portions 812, and the teeth portions 813a to 813l are aligned with each other. The positions corresponding to the holes 814a to 814l are unidirectional in the circumferential direction from one end surface 1141 in the axial direction to the center in the axial direction (in the example shown in FIG. 9, the left side from the front to the back of the paper surface). From the center of the axial direction to the other end surface 1142 in the axial direction, the other end surface 1142 in the axial direction is displaced in the other direction (in the example shown in FIG. 9, the direction on the right side from the front to the back of the paper surface). Crimping in a laminated state. By crimping the plurality of electromagnetic steel plates in this way, one and the other end faces 1151 and 1152 in the circumferential direction of the tooth portion 1013a have a region inclined with respect to the axial direction. Further, the holes 1014a and 1014b are through holes of the stator core 1011 penetrating from one end surface 1141 to the other end surface 1142 in the axial direction. In the first example, the holes 814a and 814b are through holes that penetrate the stator core 111 in a state of being inclined in one direction with respect to the axial direction (see FIG. 9B). On the other hand, in this example, as shown in FIG. 11B, the holes 1014a and 1014b are inclined in one direction from one end face 1141 in the axial direction to the center in the axial direction with respect to the axial direction. From the center of the direction to the other end surface 1142 in the axial direction is a through hole that penetrates the stator core 1011 in a state of being inclined in the other direction. Similar to the first example, the positions of the crimped portions 1015a to 1015c in the circumferential direction are the same regardless of the axial positions (see the position of the crimped portions 1015a in FIG. 11B).

In this example as well, as in the first embodiment and the first example of the present embodiment, it is preferable to satisfy the condition of the first arrangement of the holes described above.
That is, the hole 1014a is arranged so that a part of the virtual line 1111 connecting the position 1101 of the center of gravity of the caulking portion 1015a and the position 1102 of the center of gravity of the caulking portion 1015b is included inside the hole 1014a. Similarly, the hole 1014b is arranged so that a part of the virtual line 1112 connecting the position 1101 of the center of gravity of the caulking portion 1015a and the position 1103 of the center of gravity of the caulking portion 1015c is included inside the hole 1014b.

Further, it is preferable to satisfy the above-mentioned second arrangement condition.
That is, a part of the first virtual line 1131 connecting the first end point 1121 of the caulking portion 1015a and the first end point 1122 of the caulking portion 1015b to each other, the second end point 1123 of the caulking portion 1015a, and the caulking portion 1015a. The hole 1014a is arranged so that a part of the second virtual line 1132 connecting the second end point 1024 of the portion 1015b to each other is included in the inside or the edge of the hole 1014a.
Similarly, a portion of the first virtual line 1133 that connects the first endpoint 1125 of the caulking portion 1015a and the first endpoint 1126 of the caulking portion 1015c, the second endpoint 1127 of the caulking portion 1015a, and the like. The hole 1014b is arranged so that a part of the second virtual line 1134 connecting the second end point 1128 of the caulking portion 1015c to each other is included in the inside or the edge of the hole 1014b.

If the first virtual lines 1131 and 1133 have a portion that does not pass through the region of the stator core 1011, it is the first to adopt the third virtual line instead of the first virtual lines 1131 and 1133. It is as described in the embodiment.
Further, as in the first example, in this example as shown in FIG. 11B, the distance between the holes 1014a to 1014l and the caulked portion 1015a to 1015r changes depending on the position in the axial direction. Therefore, in consideration of this, it is preferable to determine the position, size, and shape of the holes 1014a to 1014l as in the first arrangement condition or the second arrangement condition described above regardless of the position in the axial direction.

As described above, in the present embodiment, since the stator core is provided with the skew, in addition to the effect described in the first embodiment, the effect of suppressing the time fluctuation of the torque of the rotary electric machines 800 and 1000 can be obtained.
In the first example and the second example described above, the case where all the regions of one and the other end faces in the circumferential direction of the teeth portion are inclined with respect to the axial direction is shown. However, some regions of one and the other end faces in the circumferential direction of the teeth portion may be inclined with respect to the axial direction, and the remaining part region may be along the axial direction (that is, the teeth portion may be aligned. Some areas of one and the other end faces in the circumferential direction do not have to be tilted). Further, also in this embodiment, various modifications described in the first embodiment can be adopted.

(Third Embodiment)
Next, a third embodiment will be described. In the first and second embodiments described above, the case where the stator cores 111, 811 and 1011 are integrated in the circumferential direction is described as an example. On the other hand, in the present embodiment, the case where the stator core is a split type stator core divided in the circumferential direction will be described as an example. As described above, the present embodiment is mainly different from the first and second embodiments in that the stator core is a split type stator core. Therefore, in the description of the present embodiment, the same parts as those of the first and second embodiments are designated by the same reference numerals as those given in FIGS. 1 to 11 and detailed description thereof will be omitted. ..

FIG. 12 is a diagram showing an example of the configuration of the rotary electric machine of the present embodiment. FIG. 12 is a view of the rotary electric machine 1200 as viewed along the axial direction. FIG. 12 is a diagram corresponding to FIG. 1 (a).
The rotary electric machine 1200 has a stator 1210 and a rotor 120. The stator 1210 has a stator core 1211, and the stator core 1211 has a plurality of stator core pieces 1211a to 1211l.
The plurality of stator core pieces 1211a to 1211l each include a yoke piece 1212a to 1212l extending in the circumferential direction and a tooth piece 1213a to 1213l extending in the direction from the inner peripheral surface of the yoke piece 1212a to 1212l toward the axis. Has. The plurality of stator core pieces 1211a to 1211l are configured by using a plurality of magnetic material plates laminated along the axial direction. In this embodiment as well, as in the first embodiment, the case where the magnetic steel plate is an electromagnetic steel plate will be described as an example.

As shown in FIG. 12, holes 1214a to 1214x are formed in the plurality of stator core pieces 1211a to 1211l, respectively. Electromagnetic steel sheets constituting the stator core pieces 1211a to 1211l by punching the base material (electrical steel sheet) so as to match the shapes of the yoke pieces 1212a to 1212l, the tooth pieces 1213a to 1213l, and the holes 1214a to 1214x. Is formed. The electromagnetic steel plates constituting the stator core pieces 1211a to 1211l all have the same shape and size.

The plurality of electrical steel sheets thus obtained are crimped in a state of being laminated so that the positions corresponding to the yoke pieces 1212a to 1212l, the tooth pieces 1213a to 1213l, and the holes 1214a to 1214x are aligned with each other. By crimping the plurality of electromagnetic steel plates in this way, the crimped portions 1215a1 to 1215l3 are formed. Further, the holes 1214a to 1214l penetrate the stator core pieces 1211a to 1211l in the stacking direction (axial direction) of the plurality of electromagnetic steel sheets. As described above, the plurality of stator core pieces 1211a to 1211l have the same shape and size, and can be realized by the same one.

The stator core 1211 is configured by combining the plurality of stator core pieces 1211a to 1211l obtained as described above in the circumferential direction. That is, the yoke portion of the stator core 1211 is formed by combining the yoke pieces 1212a to 1212l of the plurality of stator core pieces 1211a to 1211l. Further, each of the tooth pieces 1213a to 1213l serves as a teeth portion of the stator core 1211.

When a plurality of stator core pieces 1211a to 1211l are combined in the circumferential direction, the end faces of the stator core pieces at positions adjacent to each other (for example, the stator core pieces 1211b and 1211l adjacent to the stator core pieces 1211a) are connected to each other in the circumferential direction. Are facing each other.

Also in this embodiment, as in the first and second embodiments, it is preferable to satisfy the first arrangement condition or the second arrangement condition of the holes described above. As described in the first embodiment, when the length in the circumferential direction of the stator core 1211 at the radial center position of the yoke portion is equal to or less than the length obtained by dividing the length in the circumferential direction by the number of slots of the stator core 1211, these two caulking portions It is preferable to form holes in the intervening areas. From this point of view, holes 1214a and 1214b are formed in the region between the caulking portion 1215a1 and the caulking portions 1215a2, 1215a3, 1215b2 and 1215l3. Here, in the present embodiment, the hole 1214a is formed so that both the caulking portion 1215a1 and the caulking portions 1215a2 and 1215l3 satisfy the first arrangement condition and the second arrangement condition of the above-mentioned holes. .. Similarly, the hole 1214b is formed so that both the caulking portion 1215a1 and the caulking portions 1215a3 and 1215b2 satisfy the first arrangement condition and the second arrangement condition of the above-mentioned holes. The above applies to other holes as well.

However, it is not necessary to form a hole in the region between the two caulked portions existing in different stator core pieces. Further, in FIG. 12, a case where a plurality of stator core pieces 1211a to 1211l are realized by the same one is shown as an example. However, in order to satisfy the first arrangement condition or the second arrangement condition of the above-mentioned holes depending on the position of the crimped portion and the like, at least the number, position, size, and shape of the holes of at least two stator core pieces are satisfied. One may be different. In addition, in this embodiment as well, various modifications described in the first embodiment can be adopted. Further, the skew as described in the second embodiment may be provided in the split type stator core.

(Fourth Embodiment)
Next, a fourth embodiment will be described. In the first to third embodiments, a case where a plurality of magnetic plates are mechanically connected by caulking has been described as an example. On the other hand, in the present embodiment, a plurality of magnetic plates are added to the caulking and connected by welding. As described above, the present embodiment and the first to third embodiments are mainly different in configuration due to the difference in the method of connecting the plurality of magnetic plate. Therefore, in the description of the present embodiment, detailed description will be omitted by assigning the same reference numerals as those given in FIGS. 1 to 12 to the same parts as those in the first to third embodiments.

FIG. 13 is a diagram showing an example of the configuration of the rotary electric machine of the present embodiment. FIG. 13 is a view of the rotary electric machine 1300 as viewed along the axial direction. FIG. 13 is a diagram corresponding to FIG. 1 (a).
The rotary electric machine 1300 has a stator 1310 and a rotor 120. The stator 1310 has a stator core 1311. The stator core 1311 has a yoke portion (core back portion) 1312 and a plurality of tooth portions 1313a to 1313l. As shown in FIG. 13, holes 1314a to 1314x are formed in the stator core 1311. By punching the base material (magnetic material plate) so as to match the shapes of the yoke portion 1312, the plurality of tooth portions 1313a to 1313l, and the holes 1314a to 1314x, the magnetic material plate constituting the stator core 1311 can be formed. It is formed. The magnetic plates constituting the stator core 1311 all have the same shape and size. Also in this embodiment, a case where an electromagnetic steel sheet is used as the magnetic steel plate will be described as an example as in the first embodiment.

The plurality of electrical steel sheets thus obtained are crimped in a state of being laminated so that the positions corresponding to the yoke portions 1312, the teeth portions 1313a to 1313l, and the holes 1314a to 1314x are aligned with each other. By crimping the plurality of electromagnetic steel plates in this way, the crimped portions 1315a to 1315x are formed. After that, welding is performed on the outer peripheral surface of the yoke portion 1312 at a plurality of positions in the circumferential direction over the entire axial direction. By performing welding in this way, welded portions 1316a to 1316l are formed. The welded portions 1316a to 1316l are portions where the original electromagnetic steel sheet is melted and then solidified. The welded portions 1316a to 1316l are examples of connecting portions that thermally connect a plurality of electrical steel sheets. The number, position, and range of the welded portions are not particularly limited as long as a plurality of electromagnetic steel plates can be connected. By connecting the plurality of electrical steel sheets as described above, the holes 1314a to 1314x penetrate the stator core 1311 in the stacking direction (axial direction) of the plurality of electrical steel sheets.

Also in this embodiment, as in the first and second embodiments, it is preferable to satisfy the first arrangement condition or the second arrangement condition of the holes described above. However, in the first arrangement condition and the second arrangement condition of the holes described in the first embodiment, the caulked portions 115a, 115d, 115g, 115j, 115m, 115p are replaced with the welded portions 1316a to 1316l. Here, the position of the center of gravity of the welded portion is the contour of the region of the welded portion when the welded portion is viewed along the direction perpendicular to the plate surface of the electromagnetic steel plate (that is, when the welded portion is viewed in a plane). Refers to the position of the center of gravity of the plane to be the edge. Further, the end point of the welded portion refers to the end point of the region of the welded portion when the welded portion is viewed along the direction perpendicular to the plate surface of the electromagnetic steel plate (that is, when the welded portion is viewed in a plane).

As described in the first embodiment, when the length in the circumferential direction of the stator core 1311 at the radial center position of the yoke portion 1312 is less than or equal to the length obtained by dividing the length in the circumferential direction by the number of slots of the stator core 1311, these two caulking portions It is preferable to form holes in the area between them. This is the same even if the crimped portion is replaced with the welded portion. From this point of view, holes 1314a and 1314b are formed in the region between the welded portion 1316a and the caulked portions 1315a, 1315x, 1315b and 1315c. Here, in the present embodiment, the holes 1314a are formed so that both the welded portion 1316a and the caulked portions 1315a and 1315x satisfy the first arrangement condition and the second arrangement condition of the holes described above. .. Similarly, the holes 1314b are formed so that both the welded portion 1316a and the caulked portions 1315b and 1315c satisfy the first arrangement condition and the second arrangement condition of the holes described above. The above applies to other holes as well.

FIG. 13 is a diagram showing an example of arrangement of holes 1314a and 1314b. Specifically, FIG. 13 is a diagram showing a part (about 60 [°] minutes) of the stator core in the circumferential direction, and is a diagram showing an extracted region of FIG. 13 near the teeth portion 1313a.

Also in this example, as in the first embodiment, it is preferable to satisfy the first arrangement condition of the holes described above.
That is, the hole 1314a is arranged so that a part of the virtual line 1411a connecting the position 1401 of the center of gravity of the welded portion 1316a and the position 1402a of the center of gravity of the caulking portion 1315a is included inside the hole 1314a. Further, the hole 1314a is arranged so that a part of the virtual line 1412a connecting the position 1401 of the center of gravity of the welded portion 1316a and the position 1403a of the center of gravity of the caulked portion 1315x is included inside the hole 1314a.

Similarly, the hole 1314b is arranged so that a part of the virtual line 1411b connecting the position 1401 of the center of gravity of the welded portion 1316a and the position 1402b of the center of gravity of the caulked portion 1315b is included inside the hole 1314b. Further, the hole 1314b is arranged so that a part of the virtual line 1412b connecting the position 1401 of the center of gravity of the welded portion 1316a and the position 1403b of the center of gravity of the caulking portion 1315c is included inside the hole 1314b.

Further, it is preferable to satisfy the above-mentioned second arrangement condition.
That is, a part of the first virtual line 1432a connecting the second end point 1423a of the welded portion 1316a and the second end point 1424a of the caulked portion 1315a, the first end point 1421a of the welded portion 1316a, and the caulking portion 1316a. The hole 1314a is arranged so that a part of the second virtual line 1431a connecting the first end point 1422a of the portion 1315a to each other is included in the inside or the edge of the hole 1314a. Further, a part of the first virtual line 1434a connecting the second end point 1423a of the welded portion 1316a and the second end point 1426a of the caulked portion 1315x, the first end point 1421a of the welded portion 1316a, and the caulking portion 1316a. The hole 1314a is arranged so that a part of the second virtual line 1433a connecting the first end point 1425a of the portion 1315x and the first end point 1425a is included in the inside or the edge of the hole 1314a.

Similarly, a part of the first virtual line 1432b connecting the second end point 1423b of the welded portion 1316a and the second end point 1424b of the caulked portion 1315b, the first end point 1421b of the welded portion 1316a, and the like. The hole 1314b is arranged so that a part of the second virtual line 1431b connecting the first end point 1422b of the caulking portion 1315b to each other is included in the inside or the edge of the hole 1314b. Further, a part of the first virtual line 1434b connecting the second end point 1423b of the welded portion 1316a and the second end point 1426b of the caulked portion 1315c, the first end point 1421b of the welded portion 1316a, and the caulking portion 1316a. The hole 1314b is arranged so that a part of the second virtual line 1433b connecting the first end point 1425b of the portion 1315c to each other is included in the inside or the edge of the hole 1314b.

In the present embodiment, the case where the welded portion and the crimped portion are used together has been described as an example. However, a plurality of electrical steel sheets may be connected only by welding. In addition, in this embodiment as well, various modifications described in the first embodiment can be adopted. Further, a skew as described in the second embodiment may be provided. Further, welding may be performed on each of the stator core pieces of the split type stator core described in the third embodiment for connecting a plurality of electromagnetic steel plates.

The shape of the stator core shown in each of the above-described embodiments is not limited to this. Specifically, the dimensions of the outer diameter and inner diameter of the stator core, the thickness to be laminated, the number of slots, the dimensional ratio between the circumferential direction and the radial direction of the teeth portion, the dimensional ratio in the radial direction between the teeth portion and the yoke portion, etc. are desired. It can be arbitrarily designed according to the characteristics of a rotating electric machine (for example, a motor).

Further, the rotor in the present invention can be configured with various known structures such as a permanent magnet field type such as a surface magnet type and an embedded magnet type, an electromagnet field type, and a reluctance type composed of only a magnetic material. Therefore, a detailed description will be omitted.

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.

100: rotary electric machine, 110: stator, 111: stator core, 112: yoke part, 113a to 113l: teeth part, 114a to 114l: hole, 115a to 115r: caulking part

Claims (3)

An annular yoke portion extending in the circumferential direction, and a plurality of teeth portions extending in the direction from the inner peripheral surface of the yoke portion toward the axis and arranged at intervals in the circumferential direction. It is a stator core with
The yoke portion and the plurality of teeth portions have a plurality of magnetic plates laminated so that the plate surfaces are parallel to each other.
The plurality of magnetic material plates have a plurality of connecting portions for connecting the plurality of magnetic material plates to each other.
It has a high-resistance region in the realm of the magnetic plate,
The electrical resistivity in the high resistance region is higher than the electrical resistivity of the magnetic plate.
The high resistance region, Ri region der present from one end face of the direction along the axis of the stator core to the other end face,
The plurality of connecting portions include a connecting portion formed on the yoke portion and a connecting portion formed on the teeth portion.
The high resistance region is at least the stator core of the connecting portion formed in the yoke portion, characterized that you have formed between the teeth portion formed connecting part. One of the high-resistance region, claims, characterized a connecting portion formed in the yoke portion, that you have been formed so as to straddle the two virtual lines connecting the connecting portion formed on the tooth portion The stator core according to 1. A rotary electric machine having a stator having a stator core according to claim 1 or 2 and a rotor.

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