JP2017093082A - Dynamo-electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dynamo-electric machine in which reduction of motor torque due to decrease in the amount of magnetic flux can be suppressed.SOLUTION: A dynamo-electric machine 100 includes a stator core 20, and a rotor core 30 provided to face the stator core 20, and having magnet holes 31a embedded with a plurality of permanent magnets 31. The rotor core 30 includes salient poles 30b protruding farther radial outside than the permanent magnets 31, and having arcuate parts 30a of the same curvature as that of the outermost peripheral circle 300 of the rotor core 30, and a bridge 30c provided on the opposite sides of the salient pole 30b in the circumferential direction of the salient pole 30b, and having a connection C protruding radial outward, where the connection C is provided in the range of the outermost peripheral circle 300 passing the outermost peripheral point of the rotor core.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a rotating electrical machine, and more particularly, to a rotating electrical machine including a rotor core in which permanent magnets are embedded.

  Conventionally, a rotating electrical machine including a rotor core in which permanent magnets are embedded is known (see, for example, Patent Document 1 and Patent Document 2).

  Patent Document 1 discloses a rotating electric machine including an embedded magnet type motor including a rotor core in which a permanent magnet is embedded. In this rotating electrical machine, a rotor yoke (rotor core) including a plurality of permanent magnets embedded so as to have a flux barrier made of a gap on both sides in the rotational direction, and an annular shape having a predetermined distance from the rotor yoke on the radially outer side of the rotor yoke A stator core to be arranged and an exciting coil (winding) for exciting the stator core are provided. The rotor yoke includes a convex pole portion that protrudes radially outward of the permanent magnet, and a bridge portion that connects the convex pole portions on the radially outer side of the flux barrier. On the rotor yoke, the curvature of the outer peripheral surface of the convex pole portion in the vicinity of the outermost peripheral point where the distance from the rotation center is maximum is the curvature of the outermost peripheral circle passing through the outermost peripheral point of the rotor yoke with the rotation center of the rotor yoke as the center. It is comprised so that it may become larger.

  In Patent Document 2, as in Patent Document 1, a rotating electrical machine including an embedded magnet type motor including a rotor core in which a magnet (permanent magnet) is embedded is disclosed. In this rotating electrical machine, the rotor core includes a core body fixed to the rotor shaft and six magnetic pole portions provided so as to protrude in the radial direction from the core body. The magnetic pole portion is provided with a magnet mounting hole into which a magnet is inserted, and a groove-like recess is formed between adjacent magnetic pole portions. Cutout portions are provided at both ends in the circumferential direction of the magnetic pole portion. Similarly to Patent Document 1, the curvature of the outer peripheral surface of the magnetic pole portion in the vicinity of the outermost peripheral point where the distance from the rotation center is maximum on the rotor core is centered on the rotation center of the rotor core, and the outermost peripheral point of the rotor core. It is comprised so that it may become larger than the curvature of the outermost periphery circle which passes through.

JP 2014-54155 A International Publication No. 2014/027631

  However, in the rotating electrical machine described in Patent Document 1 (Patent Document 2), the curvature of the outer peripheral surface of the convex pole portion (magnetic pole portion) at the outermost peripheral point on the rotor yoke (rotor core) is larger than the curvature of the outermost peripheral circle. large. Here, as the curvature of the outer peripheral surface of the convex pole part (magnetic pole part) at the outermost peripheral point becomes larger than the curvature of the outermost peripheral circle, the circumferential width of the convex pole part (arc-shaped part of the magnetic pole part) becomes larger. Therefore, it is necessary to reduce the width of the permanent magnet in the circumferential direction or bring the permanent magnet closer to the rotation center side of the rotor core. However, when the circumferential width of the permanent magnet is reduced, the surface area of the permanent magnet on the side facing the stator core is reduced, so that the amount of magnetic flux is reduced. Further, when the permanent magnet is moved closer to the rotation center side of the rotor core, the distance between the permanent magnet and the stator core is increased, so that the amount of magnetic flux is reduced. Thus, when the amount of magnetic flux decreases, there is a problem that the motor torque decreases.

  The present invention has been made to solve the above-described problems, and one object of the present invention is to provide a rotating electrical machine capable of suppressing a decrease in motor torque caused by a decrease in the amount of magnetic flux. It is to be.

  In order to achieve the above object, a rotating electrical machine according to one aspect of the present invention includes a stator core and a rotor core that is provided to face the stator core and has a magnet hole in which a plurality of permanent magnets are embedded. A convex pole portion projecting radially outward from the permanent magnet and having an arcuate arc portion equal to the curvature of the outermost circumferential circle of the rotor core, and provided on both sides in the circumferential direction of the convex pole portion, and radially outward And a bridge portion provided in a range of an outermost circumference circle passing through the outermost circumference point of the rotor core.

  In the rotating electrical machine according to one aspect of the present invention, the curvature of the arc portion of the convex pole portion is configured to be equal to the curvature of the outermost circle of the rotor core so that the curvature of the arc portion of the convex pole portion is the outermost circumference. Compared with the case where the curvature is larger than the curvature of the circle, the magnet hole and the permanent magnet can be arranged more radially outward without reducing the circumferential width of the permanent magnet. Thereby, the fall of the surface area of a permanent magnet can be suppressed. As a result, it is possible to suppress a decrease in motor torque due to a decrease in the amount of magnetic flux.

  In the rotating electrical machine according to the one aspect described above, preferably, the projecting pole portion further includes a linear portion extending obliquely inward in the radial direction from the end portions on both sides in the circumferential direction of the arc portion to the end portion of the bridge portion, The straight portion is provided on the inner diameter side of the outermost circumference circle of the rotor core, and the length between both ends of the arc portion of the convex pole portion is between both end portions of the bridge portion intersecting with the straight portion provided at both ends of the convex pole portion. It is comprised so that it may become smaller than the length of.

  According to this configuration, by providing a linear portion that is inclined inward in the radial direction, the outer peripheral surface of the rotor core is permanently connected to the outer peripheral surface of the rotor core as compared with the case where the arc portion is connected from both ends in the circumferential direction to the bridge portion. Since the distance to the magnet is reduced, the vicinity of the portion connected to the straight portion of the bridge portion becomes thinner. Thereby, since the magnetic resistance of a bridge part can be increased, the leakage of the magnetic flux from a bridge part can be suppressed. In addition, by making the length between both ends of the arc portion smaller than the length between both ends of the bridge portion intersecting with the straight portion, the length between both ends of the arc portion becomes both ends of the bridge portion intersecting with the straight portion. The angle at which the straight portion and the bridge portion are connected is greater than when the length is greater than or equal to the length between them. As a result, it is possible to suppress the load due to the centrifugal force applied to the convex pole portion due to the rotation of the rotor core from concentrating on the connection portion between the bridge portion and the straight portion. Thereby, durability of a rotor core can be improved.

  In the rotating electrical machine provided with the linear portion, preferably, the bridge portion is connected to the first bridge portion having one end connected to the end portion of the linear portion and the other end of the first bridge portion, and from the other end. A second bridge portion extending in an inclined manner toward the radially inner diameter side, and a second bridge portion provided on one side of the convex pole portion corresponding to one of the adjacent permanent magnets, and an adjacent permanent The second bridge portion provided on the other side of the convex pole portion corresponding to the other of the magnets is connected, and the rotor core includes a connection portion between adjacent second bridge portions, a center side of the rotor core, and And a connecting portion for supporting the short side of the permanent magnet having a rectangular cross section.

  If comprised in this way, since it will become a structure which a permanent magnet extends to a connection part, the width | variety of the circumferential direction of a permanent magnet becomes large, and, as a result, it can suppress the fall of the surface area of the permanent magnet on the side facing a stator core. In addition, it is possible to further suppress a reduction in motor torque due to a decrease in the amount of magnetic flux.

  In the rotating electrical machine having a connecting portion that supports the short side of the permanent magnet, preferably, the connecting portion has a circumferential width in the vicinity of the central portion in the radial direction so as to support the short side of the permanent magnet. It is comprised so that it may become larger than the width | variety of the circumferential direction of a part.

  If comprised in this way, since the short side of a permanent magnet and a connection part contact | connect, a permanent magnet can be supported easily. In addition, since the circumferential width of the connecting portion is uniformly smaller than the circumferential width in the vicinity of the central portion in the radial direction, the minimum circumferential width of the connecting portion is reduced. As a result, leakage of magnetic flux from the connecting portion can be suppressed.

  In the rotating electrical machine having the first bridge portion, the second bridge portion, and the connecting portion, preferably, the minimum width in the direction orthogonal to the direction in which the first bridge portion of the first bridge portion extends, or the first The at least one of the minimum widths in the direction orthogonal to the direction in which the second bridge portion of the two bridge portions extends is configured to be equal to the minimum width in the direction orthogonal to the direction in which the connection portion of the connection portion extends. Has been.

  If comprised in this way, since stress will be disperse | distributed by at least one of a 1st bridge part or a 2nd bridge part, and a connection part, durability of a rotor core can be improved.

It is the top view which looked at the stator core and rotor core of the rotary electric machine by one Embodiment of this invention from the axial direction. It is the top view which looked at the rotor core of the rotary electric machine by one Embodiment of this invention from the axial direction. FIG. 3 is an enlarged view of FIG. 2.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  With reference to FIGS. 1-3, the structure of the rotary electric machine 100 by this embodiment is demonstrated.

  [General configuration of motor]

  As shown in FIG. 1, the rotating electrical machine 100 is, for example, an IPM motor in which a permanent magnet 31 described later is embedded in a rotor core 30. The rotating electrical machine 100 includes a stator core 20 and a rotor core 30. The rotor core 30 is provided inside the annular stator core 20 so as to face the stator core 20. In the present specification, “circumferential direction” means the circumferential direction of the rotor core 30 (stator core 20), and “radial direction” means the radial direction of the rotor core 30.

  As shown in FIG. 1, the stator core 20 is provided with a plurality of (for example, nine) teeth 22 so as to protrude from the back yoke 21 toward the inner peripheral side. Slots 23 are respectively formed between adjacent teeth 22. A winding (not shown) is wound around each tooth 22 (slot 23).

[Configuration of rotor core]
Here, in this embodiment, as shown in FIGS. 1 to 3, the rotor core 30 has a plurality of (for example, six) cross-sections having a rectangular shape (rectangular shape) as viewed from the rotation axis direction (Z direction). It has a magnet hole 31a in which the permanent magnet 31 is embedded. The six permanent magnets 31 are embedded at equal angular intervals in the circumferential direction. As shown in FIGS. 2 and 3, the rotor core 30 is provided with a convex pole portion 30 b that protrudes radially outward of each of the six permanent magnets 31 and has an arc portion 30 a having an arc shape on the outer diameter side. ing. The rotor core 30 includes bridge portions 30c that are provided on both sides of the convex pole portion 30b in the circumferential direction and provided between the outer diameter side of the rotor core 30 and the magnet hole 31a. The bridge portion 30c protrudes outward in the radial direction. Specifically, when viewed from the rotation axis direction, in the bridge portion 30c, a connection portion C (see FIG. 3) between a first bridge portion 301c and a second bridge portion 302c described later overlaps with the outermost circumference circle 300, The portions other than the connection portion C are provided on the inner diameter side from the outermost peripheral circle 300. Further, the vicinity of the connection portion C of the bridge portion 30 c is formed in an arc shape having a larger curvature than the outermost peripheral circle 300. The connection portion C is an example of the “convex portion” or “the other end of the first bridge portion” in the claims.

  In the present embodiment, when viewed from the rotation axis direction of the rotor core 30, the curvature on the outer diameter side of the arc portion 30 a of the convex pole portion 30 b is equal to the curvature of the outermost circumference circle 300. That is, the outermost circumferential circle 300 and the arc portion 30a overlap each other.

  When viewed from the rotational axis direction, the magnet hole 31 a supports the two long sides 310 of the permanent magnet 31 in a state where the permanent magnet 31 is inserted, and from the vicinity of the center of each of the two short sides 311 of the permanent magnet 31. Supports the inner diameter side. Further, when viewed from the rotational axis direction, the permanent magnet 31 is inserted into the magnet hole 31a so as to cover the outer diameter side from the vicinity of the center of each of the two short sides 311 of the permanent magnet 31 and project in the circumferential direction. The gap portion 31b is formed.

  Further, in the present embodiment, the convex pole portion 30b includes a linear portion 30e extending obliquely inward in the radial direction from the connection portion A, which is an end portion on both sides in the circumferential direction of the arc portion 30a, to the end portion of the bridge portion 30c. Is provided. The straight portion 30 e extends in a straight line when viewed from the rotation axis direction, and is provided on the inner diameter side of the outermost circumferential circle 300. In addition, the length L1 (see FIG. 2) between the connecting portions A at both ends of the arc portion 30a in the tangential direction of the center in the circumferential direction of the arc portion 30a is between the connecting portions B between the bridge portion 30c and the straight portion 30e. It is comprised so that it may become smaller than length L2 (refer FIG. 2). Specifically, the length L1 and the length L2 are configured such that L2 / L1 is greater than 1 and 3 or less. The connection portion A is an example of the “ends on both sides in the circumferential direction of the arc portion” in the claims. The connection portion B is an example of “both ends of the bridge portion intersecting with the straight portion” or “one end of the first bridge portion” in the claims.

  In the present embodiment, as shown in FIGS. 2 and 3, the bridge portion 30c includes a first bridge portion 301c connected to the outer end portion (connection portion B) of the straight portion 30e (see FIG. 3). , Connected to the outer end portion (connecting portion C) of the first bridge portion 301c, and extended obliquely toward the inner diameter side in the radial direction with respect to the extending direction of the first bridge portion 301c when viewed from the rotation axis direction. And a second bridge portion 302c. In addition, the second bridge portion 302 c provided on one side of the convex pole portion 30 b corresponding to one of the adjacent permanent magnets 31 and the other of the convex pole portions 30 b corresponding to the other of the adjacent permanent magnets 31. The second bridge portion 302c provided on the side is directly connected.

  As shown in FIG. 3, the rotor core 30 includes a connecting portion 30 f that connects the connecting portion D between the adjacent second bridge portions 302 c and the inner diameter side of the rotor core 30 and supports the short side 311 of the permanent magnet 31. Have. Specifically, the first bridge portion 301 c extends along the vicinity of the end portion 310 a of the long side 310 on the outer diameter side of the permanent magnet 31 when viewed from the rotation axis direction. The second bridge portion 302c extends along the side 310b on the outer diameter side of the gap portion 31b when viewed from the rotation axis direction. Further, a line segment α (see FIG. 2) passing through the connecting portion D and the rotation center 30d (see FIG. 2) of the rotor core 30 passes through a connecting portion 30f provided between adjacent magnet holes 31a. Moreover, the bridge part 30c and the connection part 30f each function as a flux barrier.

  In the present embodiment, the connecting portion 30f has a circumferential width W1 in the vicinity of the central portion in the radial direction larger than the circumferential width of other portions so as to support the short side 311 of the permanent magnet 31. It is comprised so that it may become. Specifically, the connecting portion 30f gradually increases in width from the outer diameter side toward the central portion, and gradually decreases in width from the central portion toward the inner diameter side.

  In the present embodiment, the minimum width W2 of the first bridge portion 301c in the direction orthogonal to the direction in which the first bridge portion 301c extends and the direction in which the second bridge portion 302c of the second bridge portion 302c extends. The minimum width W3 in the direction orthogonal to the direction W is configured to be equal to the minimum width W1 in the direction orthogonal to the direction in which the connection portion 30f of the connection portion 30f extends. Specifically, as viewed from the rotation axis direction, each of the first bridge portion 301c and the second bridge portion 302c extends uniformly, and thus the first bridge portion 301c of the first bridge portion 301c. The width in the direction orthogonal to the extending direction of W2 is uniformly W2, and the width of the second bridge portion 302c in the direction orthogonal to the extending direction of the second bridge portion 302c is uniformly W3. Further, the width in the direction orthogonal to the direction in which the connecting portion 30f extends is the smallest in the portion where the gap portion 31b on one side of the magnet hole 31a and the gap portion 31b on the other side of the adjacent magnet hole 31a are closest to each other. The value is W1.

  A recess 30g that is recessed toward the inner diameter side is provided between the second bridge portions 302c that are directly connected. Specifically, since the connection portion C is on the outermost circumferential circle 300 and the connection portion D is on the inner diameter side of the outermost circumferential circle 300, a recess 30g is formed between the second bridge portions 302c.

  Further, the second bridge portions 302c that are directly connected to each other are arranged in a V shape. Specifically, the second bridge portion 302c extends in a straight line so as to form a recess 30g when viewed from the rotation axis direction, and is arranged in a V shape.

  The magnet hole 31a is configured to have a gap 31c in the vicinity of the end 310c on the inner diameter side of the permanent magnet 31 in a state where the permanent magnet 31 is embedded in the magnet hole 31a. Specifically, a semicircular gap portion 31c is provided that covers the vicinity of the end portion 310c of the long side 310 on the inner diameter side of the permanent magnet 31 as viewed from the rotation axis direction and protrudes toward the inner diameter side.

[Effect of this embodiment]
In the present embodiment, the following effects can be obtained.

  In the present embodiment, the curvature of the arc portion 30a of the convex pole portion 30b is equal to the curvature of the outermost circumference circle 300 of the rotor core 30, so that the curvature of the arc portion 30a of the convex pole portion 30b is the outermost circumference. Compared with the case where the curvature is larger than the curvature of the circle 300, the magnet hole 31a and the permanent magnet 31 can be arranged on the outer side in the radial direction without reducing the circumferential width of the permanent magnet 31. Thereby, the fall of the surface area of the permanent magnet 31 can be suppressed. As a result, it is possible to suppress a decrease in motor torque due to a decrease in the amount of magnetic flux.

  Further, in the present embodiment, by providing the linear portion 30e inclined inward in the radial direction, the rotor core 30 is compared with the case where the connection is made from the connection portion A on both sides in the circumferential direction of the arc portion 30a to the bridge portion 30c by an arc. Since the distance between the outer peripheral surface of the magnet and the permanent magnet 31 becomes smaller, the vicinity of the portion of the bridge portion 30c connected to the straight portion 30e becomes thinner. Thereby, since the magnetic resistance of the bridge part 30c can be increased, the leakage of the magnetic flux from the bridge part 30c can be suppressed. Further, the length between both ends of the arc portion 30a intersects with the straight portion 30e by making the length between both ends of the arc portion 30a smaller than the length between both ends of the bridge portion 30c intersecting with the straight portion 30e. The angle at which the straight portion 30e and the bridge portion 30c are connected is greater than when the length is greater than or equal to the length between both ends of the bridge portion 30c. As a result, it is possible to suppress the load due to the centrifugal force applied to the convex pole portion 30b due to the rotation of the rotor core 30 from being concentrated on the connection portion B between the bridge portion 30c and the straight portion 30e. Thereby, durability of the rotor core 30 can be improved.

  In the present embodiment, since the permanent magnet 31 extends to the connecting portion 30f, the circumferential width of the permanent magnet 31 is increased, and as a result, the surface area of the permanent magnet 31 facing the stator core 20 is suppressed from being reduced. In addition, the motor torque can be further prevented from decreasing due to the decrease in the amount of magnetic flux.

  Moreover, in this embodiment, since the short side 311 of the permanent magnet 31 and the connection part 30f contact | connect, the permanent magnet 31 can be supported easily. In addition, since the circumferential width of the connecting portion 30f is uniformly the circumferential width (for example, W1) in the vicinity of the central portion in the radial direction, the minimum circumferential width of the connecting portion 30f is smaller. The magnetic resistance of the connecting portion 30f can be increased, and as a result, leakage of magnetic flux from the connecting portion 30f can be suppressed.

  Moreover, in this embodiment, since stress is disperse | distributed by each of the 1st bridge part 301c, the 2nd bridge part 302c, and the connection part 30f, durability of the rotor core 30 can be improved.

[Modification]
The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiment but by the scope of claims for patent, and further includes all modifications (modifications) within the meaning and scope equivalent to the scope of claims for patent.

  For example, in the said embodiment, although the width | variety of a 1st bridge | bridging part, the width | variety of a 2nd bridge | bridging part, and the minimum width | variety of a connection part were shown, this invention is not limited to this. For example, in the present invention, one of the width of the first bridge portion or the width of the second bridge portion may be configured to be equal to the minimum width of the connecting portion.

  Moreover, although the example in which the six permanent magnets were embedded was shown in the said embodiment, this invention is not limited to this. In this invention, you may comprise so that permanent magnets other than six (for example, eight pieces) may be embedded.

  Moreover, in the said embodiment, although the example where each width | variety of a 1st bridge part and a 2nd bridge part is uniform was shown, this invention is not limited to this. In the present invention, the widths of the first bridge portion and the second bridge portion may not be uniform.

  Moreover, in the said embodiment, although the space | gap part 31c showed the example which is semicircle shape, this invention is not limited to this. In the present invention, the gap 31c may not be semicircular.

[Additional notes]
The following configuration is also conceivable in the rotating electrical machine according to the above aspect.

(Additional item 1)
In the rotating electric machine having the first bridge portion and the second bridge portion, the first bridge portion and the second bridge portion are preferably provided on the inner diameter side of the outermost circle of the rotor core.

  If comprised in this way, each of a 1st bridge part and a 2nd bridge part does not interfere with a stator core by rotation of a rotor core. Therefore, it is not necessary to widen the gap between the stator core and the rotor core, and the reduction of the magnetic flux density can be suppressed, so that the reduction of the motor output can be suppressed.

(Appendix 2)
In the rotary electric machine having the first bridge portion and the second bridge portion, preferably, a concave portion that is recessed toward the inner diameter side is provided between the second bridge portions that are directly connected to each other. .

  If comprised in this way, since the width | variety of the part where 2nd bridge parts are connected will become small, the magnetic resistance of a 2nd bridge part will increase, and the leakage of the magnetic flux from a 2nd bridge part will be suppressed. can do.

(Additional Item 3)
In the rotating electrical machine provided with the concave portion, preferably, the second bridge portions that are directly connected to each other are arranged in a V shape.

  If comprised in this way, a recessed part can be formed easily.

(Appendix 4)
In the rotating electrical machine according to the above aspect, the magnet hole is preferably configured to have a gap near the inner diameter side end of the permanent magnet in a state where the permanent magnet is embedded in the magnet hole.

  If comprised in this way, since a permanent magnet can escape to a magnet hole, a permanent magnet can be easily inserted in a magnet hole.

20 Stator core 30 Rotor core 30a Arc part 30b Convex pole part 30c Bridge part 30d Center of rotation 30e Linear part 30f Connection part 30g Recess 31 Permanent magnet 31a Magnet hole 31c Gap part 100 Rotating electric machine 300 Outermost circle 301c First bridge part 302c 2nd Bridge part 311 Short side A Connection part (Ends on both sides in the circumferential direction of the arc part)
B connection part (both ends of the bridge part intersecting with the straight part) (one end of the first bridge part)
C Connection part (convex part) (the other end of the first bridge part)
D Connection portion L1 Length between connection portions A L2 Length between connection portions B W2 Width of first bridge portion (minimum width)
W3 Second bridge width (minimum width)
W4 Minimum width of connecting part

Claims (5)

A stator core;
A rotor core having a magnet hole embedded in a plurality of permanent magnets, provided to face the stator core;
The rotor core protrudes radially outward from the permanent magnet and has a convex pole portion having an arcuate arc portion equal to the curvature of the outermost peripheral circle of the rotor core, and provided on both sides in the circumferential direction of the convex pole portion. A rotating electric machine having a convex portion protruding radially outward, and the convex portion having a bridge portion provided within a range of the outermost circumferential circle passing through the outermost circumferential point of the rotor core. The convex pole portion further has a linear portion extending inwardly in the radial direction from an end portion on both sides in the circumferential direction of the arc portion to an end portion of the bridge portion,
The straight portion is provided on the inner diameter side of the outermost circle of the rotor core,
A length between both ends of the arc portion of the convex pole portion is configured to be smaller than a length between both end portions of the bridge portion that intersects with the linear portion provided at both ends of the convex pole portion. The rotating electrical machine according to claim 1. The bridge portion is connected to the first bridge portion whose one end is connected to the end portion of the linear portion and the other end of the first bridge portion, and is inclined from the other end to the radially inner diameter side. A second bridge portion extending,
The second bridge portion provided on one side of the convex pole portion corresponding to one of the adjacent permanent magnets, and the other side of the convex pole portion corresponding to the other of the adjacent permanent magnets The second bridge portion provided is connected,
The said rotor core has a connection part which supports the short side of the said permanent magnet whose cross section is a rectangular shape while connecting the connection part of said 2nd bridge parts which adjoin, and the center side of the said rotor core. The rotating electrical machine described in 1.   The connecting portion is configured such that a circumferential width in the vicinity of a central portion in the radial direction is larger than a circumferential width of other portions so as to support a short side of the permanent magnet. Item 4. The rotating electrical machine according to Item 3.   The minimum width of the first bridge portion in the direction orthogonal to the direction in which the first bridge portion extends, or the minimum width in the direction orthogonal to the direction in which the second bridge portion of the second bridge portion extends. 5. The rotating electrical machine according to claim 3, wherein at least one of the widths is configured to be equal to a minimum width in a direction orthogonal to a direction in which the connecting portion extends of the connecting portion.

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