JP2013099050A - Rotor of permanent magnet rotary electric machine and permanent magnet rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotor of a permanent magnet rotary electric machine that is excellent in heat dissipation and is easily reduced in weight, and to provide a permanent magnet rotary electric machine provided with the same.SOLUTION: A rotor 1 of a permanent magnet rotary electric machine has: a rotor core 2 that has a plurality of laminated magnetic steel sheets; and a plurality of permanent magnets 3 that are axially embedded in the rotor core 2. The rotor core 2 has axial holes 24, each axially opening on an inner side of each permanent magnet 3. At two respective ends of the rotor core 2, a pair of end plates 4 is disposed that axially sandwiches the rotor core 2 therebetween. The end plates 4 are arranged so as to cover at least part of each permanent magnet 3 and expose at least part of an opening of each axial hole 24.

Description

  The present invention relates to a rotor of a permanent magnet type rotating electrical machine having a rotor core formed by laminating a plurality of magnetic steel sheets and a plurality of permanent magnets embedded in the axial direction with respect to the rotor core, and a permanent magnet type equipped with the rotor It relates to a rotating electrical machine.

  A rotor of a permanent magnet type rotating electrical machine generally includes a rotor core formed by laminating a plurality of magnetic steel plates and a plurality of permanent magnets embedded in the rotor core in the axial direction. A pair of end plates that sandwich the rotor core from the axial direction are disposed at both ends of the rotor core in the axial direction. Thereby, while integrating a some magnetic steel plate, a permanent magnet can be hold | maintained from an axial direction (patent document 1, 2, 3).

A permanent magnet type rotating electrical machine including such a rotor energizes a stator coil disposed on the outer periphery of the rotor to rotate the rotor. At this time, the rotor may generate heat due to iron loss or the like, and its temperature may increase. In particular, in a permanent magnet type rotating electrical machine mounted on an electric vehicle, a hybrid vehicle, or the like, the voltage of driving power is high and the temperature of the rotor is likely to rise.
Patent Document 3 describes that a rotor core is provided with a slit to increase the cooling efficiency of the rotor.

JP 2010-142038 A JP-A-6-86488 JP 2008-187778 A

  However, in the rotor described in the cited document 3, the slit is provided outside the permanent magnet and in the vicinity of the outer peripheral end of the rotor core. Therefore, even if the cooling efficiency in the vicinity of the outer peripheral portion of the rotor can be improved, the heat radiation from the inner peripheral portion of the rotor cannot be efficiently performed. That is, it becomes difficult to release the heat accumulated inside the rotor. Therefore, it becomes difficult to suppress the temperature rise of the rotor core and the permanent magnet, which becomes conspicuous as the output of the permanent magnet type rotating electrical machine increases.

  Further, the rotor described in the cited document 3 is provided so that the end plate covers almost the entire area inside the area from the permanent magnet arrangement portion in the rotor core. Therefore, the weight of the end plate increases and the weight of the rotor increases. That is, there is a possibility that the inertia of the rotor is increased and the response of the permanent magnet type rotating electrical machine is lowered.

  The present invention has been made in view of such a background, and is intended to provide a rotor of a permanent magnet type rotating electrical machine that has excellent heat dissipation and is easy to reduce in weight, and a permanent magnet type rotating electrical machine including the same. is there.

One aspect of the present invention is a rotor of a permanent magnet type rotating electrical machine having a rotor core formed by laminating a plurality of magnetic steel plates and a plurality of permanent magnets embedded in the axial direction of the rotation shaft with respect to the rotor core. There,
The rotor core has an axial hole that opens in the axial direction on the inner peripheral side of the permanent magnet,
A pair of end plates that sandwich the rotor core from the axial direction are disposed at both axial ends of the rotor core,
The end plate is disposed in a rotor of a permanent magnet type rotating electric machine, wherein the end plate covers at least a part of the permanent magnet and is disposed so as to expose at least a part of the opening of the axial hole. (Claim 1).

  According to another aspect of the present invention, there is provided a permanent magnet type rotating electrical machine including the rotor and a stator disposed on an outer periphery of the rotor.

In the rotor of the permanent magnet type rotating electrical machine, the end plate is disposed so as to cover at least a part of the permanent magnet and to expose at least a part of the opening of the axial hole. Thereby, it is possible to prevent the end plate from blocking the axial hole while reliably pressing the permanent magnet from the axial direction by the end plate.
And the axial direction hole is formed in the inner peripheral side rather than the permanent magnet in a rotor core. Therefore, it is easy to radiate the rotor from the inside through the axial hole, and the temperature rise of the rotor can be effectively suppressed.

  That is, the axial hole is formed on the inner peripheral side of the permanent magnet in the rotor core, and the end plate is disposed so as not to block the axial hole. Therefore, air can be passed through the axial hole, and heat of the rotor can be released from the inside through this circulating air. Therefore, the heat radiation of the rotor can be performed efficiently.

  Further, the end plate is disposed so as to expose at least a part of the opening of the axial hole. That is, a portion where the end plate does not exist is provided at a portion on the inner peripheral side with respect to the arrangement position of the permanent magnet. Accordingly, the weight of the end plate can be reduced, and the weight of the rotor can be reduced. That is, the inertia of the rotor can be reduced, and the responsiveness of the permanent magnet type rotating electrical machine can be improved.

  As described above, according to the present invention, it is possible to provide a rotor of a permanent magnet type rotating electrical machine that is excellent in heat dissipation and easy in weight reduction, and a permanent magnet type rotating electrical machine including the rotor.

Sectional drawing of the permanent magnet type rotary electric machine in Example 1. FIG. FIG. 3 is a cross-sectional view of the rotor in the first embodiment. FIG. 3 is a cross-sectional view taken along line AA in FIG. 2. FIG. 3 is a partial enlarged cross-sectional view of the rotor in the first embodiment. FIG. 3 is a partially enlarged plan view of the rotor in the first embodiment. Sectional drawing of the rotor in Example 2. FIG. The partial enlarged plan view of the rotor in Example 2. FIG. FIG. 8 is a cross-sectional view taken along line B-B in FIG. 7. FIG. 6 is a partially enlarged plan view of a rotor in Embodiment 3. FIG. 10 is a cross-sectional view taken along line CC in FIG. 9. Sectional drawing of the rotor in Example 4. FIG.

In the rotor of the permanent magnet type rotating electrical machine, each of the end plates arranged at both ends of the rotor core in the axial direction may be formed integrally or divided into a plurality of parts.
Moreover, although it is preferable that the whole opening part is exposed from the end plate, only a part of the axial hole may be exposed. Further, in the case where a plurality of the axial holes are formed in the rotor core, it is preferable that the openings of all the axial holes are exposed from the end plate, but the openings of some of the axial holes May be exposed.

  Preferably, the end plate is annular, and is arranged so as to expose at least a part of the opening of the axial hole on the inner peripheral side of the end plate. In this case, the weight of the end plate can be further reduced, and the weight of the rotor can be further reduced.

  Further, it is preferable that the axial hole penetrates the rotor core in the axial direction. In this case, since air flows from one opening to the other through the axial hole, the heat dissipation of the rotor can be improved.

  Moreover, it is preferable that the said axial direction hole is continuously formed with the magnet accommodation hole which accommodates the said permanent magnet in the said rotor core. In this case, since the air flowing through the axial hole comes into contact with the permanent magnet, the permanent magnet can be efficiently cooled, and the temperature increase of the permanent magnet can be effectively suppressed. . Thereby, the fall of the magnetic force of a permanent magnet can be prevented more reliably, and the output fall of a permanent magnet type rotary electric machine can be prevented reliably.

  The end plate may cover the entire permanent magnet. In this case, the permanent magnet can be more securely held in the axial direction by the end plate.

The end plate is preferably made of a nonmagnetic material. In this case, the magnetic flux generated by the permanent magnet can be prevented from leaking from the rotor in the axial direction. Thereby, the output efficiency of a permanent magnet type rotating electrical machine can be improved.
In addition, when a non-magnetic metal is used as the material of the end plate, sufficient rigidity of the end plate can be easily obtained even if the thickness is reduced, compared with the case of using a resin or the like. Can be achieved. Furthermore, heat can be radiated through an end plate made of a non-magnetic metal, and the heat dissipation of the rotating body can be further improved.

Example 1
A rotor of a permanent magnet type rotating electrical machine according to an embodiment and a permanent magnet type rotating electrical machine including the same will be described with reference to FIGS.
As shown in FIG. 1, the permanent magnet type rotating electrical machine 10 of the present example includes a rotor 1 and a stator 100 disposed on the outer periphery thereof.
As shown in FIGS. 2 and 3, the rotor 1 includes a rotor core 2 formed by laminating a plurality of magnetic steel plates 20 and a plurality of permanent magnets 3 embedded in the rotor core 2 in the axial direction.

The rotor core 2 has an axial hole 24 that opens in the axial direction on the inner peripheral side of the permanent magnet 3. In this example, the axial hole 24 penetrates the rotor core 2 in the axial direction.
A pair of end plates 4 that sandwich the rotor core 2 from the axial direction are disposed at both ends of the rotor core 2 in the axial direction.
As shown in FIGS. 4 and 5, the end plate 4 is disposed so as to cover at least part of the permanent magnet 3 and to expose at least part of the opening of the axial hole 24.

As shown in FIG. 2, the plurality of permanent magnets 3 are arranged in the circumferential direction in the vicinity of the outer peripheral portion of the rotor 1. A pair of permanent magnets 3 arranged with their inner peripheral side end portions 31 close to each other in the circumferential direction of the rotor core 2 are arranged so as to be separated from each other toward the outer periphery of the rotor core 2.
The rotor core 2 includes a magnet accommodation hole 21 into which the permanent magnet 3 is inserted and disposed, and the magnet accommodation hole 21 is open to the outer periphery.

  As shown in FIG. 4, the magnetic steel plate 20 (the rotor core 2) includes a bridge portion 22 formed between the inner peripheral side end portions 212 of the pair of magnet housing holes 21 that are close to each other in the circumferential direction and communicate with the edge portion. And a peninsula portion 23 which is a portion on the outer peripheral side of the bridge portion 22 and formed between the pair of magnet housing holes 21.

  Each permanent magnet 3 has a substantially rectangular shape when viewed from the axial direction, and the surface of the long side portion is a magnetic pole surface. And it arrange | positions so that one magnetic pole may be comprised by a pair of adjacent permanent magnet 3. FIG. That is, the pair of permanent magnets 3 arranged with the inner peripheral side end portions 31 close to each other are arranged with the same magnetic pole surface (N pole or S pole) facing the outer peripheral side. A plurality of pairs of the permanent magnets 3 (magnet pairs 30) are arranged in the circumferential direction of the rotor core 2 as shown in FIG. The plurality of magnet pairs 30 are arranged such that the magnetic poles on the outer peripheral side are alternately N and S poles. The plurality of magnet pairs 30 are arranged circumferentially at equal intervals.

Magnet arrangement holes 21 are formed in the rotor core 2 in an arrangement corresponding to the arrangement of the permanent magnets 3 in the rotor 1.
A shaft hole 25 that penetrates the output shaft is formed at the center of the rotor core 2.

  As shown in FIGS. 2 and 4, the magnet accommodation hole 21 provided in the rotor core 2 includes a communication portion 211 that communicates the magnet accommodation hole 21 with the outer peripheral edge. By forming the communication portion 211, it is possible to prevent the magnetic flux emitted from the permanent magnet 3 from being short-circuited around the permanent magnet 3 in the rotor core 2 (magnetic flux leakage).

  The axial hole 24 is formed continuously with the magnet housing hole 21. Specifically, the axial hole 24 is formed at an inner peripheral corner of the inner peripheral end 212 of the magnet housing hole 21. That is, when the permanent magnet 3 is arranged in the magnet housing hole 21, the axial hole 24 faces the inner peripheral corner (inner peripheral corner 312) at the inner peripheral end 31 of the permanent magnet 3. Will be formed.

  As shown in FIGS. 3 and 5, the end plate 4 covers the majority of the permanent magnet 3 from the axial direction, and the axial direction of the rotor core 2 with the opening of the axial hole 24 partially exposed. It is arranged at both ends. That is, as shown in FIGS. 2 and 5, the end plate 4 is formed in an annular shape, and the outer peripheral edge 41 is disposed near the outer peripheral side corner 311 of the permanent magnet 3, and the inner peripheral edge 42 is formed. The permanent magnet 3 is disposed in the vicinity of the inner peripheral corner 312. A part of the opening of the axial hole 24 is exposed on the inner peripheral side of the inner peripheral edge 42.

In this example, the end plate 4 is arranged with the outer peripheral edge 41 on the inner peripheral side with respect to the outer peripheral corner 311 of the permanent magnet 3, and the inner peripheral edge 42 with respect to the inner peripheral corner 312 of the permanent magnet 3. Arranged on the outer periphery.
The end plate 4 is made of a non-magnetic material, and for example, a metal plate such as aluminum, stainless steel, or brass can be used.

Further, a pair of end plates 4 sandwiching a plurality of laminated magnetic steel plates 20 from both ends in the axial direction are caulked in the axial direction by rivets 11 as shown in FIG. 5, for example. That is, the rotor 1 can be integrated by a plurality of rivets 11 having a pair of end plates 4 arranged at both ends in the axial direction and a plurality of magnetic steel plates 20 penetrating in the axial direction. In this case, the rivet 11 is preferably disposed on the peninsula portion 23 in the rotor core 2. In this case, it is possible to effectively prevent the axial dimension of the rotor core 2 from expanding due to the warp of the peninsula portion 23 that is most easily deformed among the magnetic steel plates 20.
Note that rivets are omitted in FIGS. Further, the means for fixing the end plate 4 to the rotor core 2 is not particularly limited to rivets.

As shown in FIG. 1, the permanent magnet type rotating electrical machine 10 of the present example is configured by arranging the rotor 1 having the above-described configuration inside a stator 100 formed in an annular shape.
The stator 100 includes an annular stator core 101 and a coil 103 provided in a slot between teeth 102 arranged in a plurality on the inner periphery of the stator core 101.
In addition, the permanent magnet type rotary electric machine 10 of this example is mounted in vehicles, such as an electric vehicle and a hybrid vehicle, for example.

Next, the function and effect of this example will be described.
In the rotor 1, the end plate 4 is disposed so as to cover at least a part of the permanent magnet 3 and expose at least a part of the opening of the axial hole 24. Thereby, it is possible to prevent the end plate 4 from blocking the axial hole 24 while reliably pressing the permanent magnet 3 from the axial direction by the end plate 4.
The axial hole 24 is formed on the inner peripheral side of the permanent magnet 3 in the rotor core 2. Therefore, it is easy to radiate the rotor 1 from the inside through the axial hole 24, and the temperature rise of the rotor 1 can be effectively suppressed.

  That is, an axial hole 24 is formed on the inner peripheral side of the rotor core 2 relative to the permanent magnet 3, and the end plate 4 is disposed so as not to block the axial hole 24. Therefore, air can be passed through the axial hole 24, and the heat of the rotor 1 can be released from the inside through this circulating air. Therefore, the heat radiation of the rotor 1 can be performed efficiently.

  The end plate 4 is disposed so as to expose at least a part of the opening of the axial hole 24. That is, a portion where the end plate 4 does not exist is provided at a portion on the inner peripheral side with respect to the arrangement position of the permanent magnet 3. Accordingly, the weight of the end plate can be reduced, and the weight of the rotor 1 can be reduced. That is, the inertia of the rotor 1 can be reduced, and the responsiveness of the permanent magnet type rotating electrical machine 10 can be improved.

  Further, since the axial hole 24 penetrates the rotor core 2 in the axial direction, air flows through the axial hole 24 from one opening to the other opening, so that the heat dissipation of the rotor 1 is improved. be able to.

  The axial hole 24 is formed continuously with the magnet housing hole 21 in the rotor core 2. Therefore, since the air flowing through the axial hole 24 comes into contact with the permanent magnet 3, the permanent magnet 3 can be efficiently cooled, and the temperature rise of the permanent magnet 3 can be effectively suppressed. it can. Thereby, the fall of the magnetic force of the permanent magnet 3 can be prevented more reliably, and the output fall of the permanent magnet type rotary electric machine 10 can be prevented reliably.

  Further, since the end plate 4 is made of a non-magnetic material, the magnetic flux generated by the permanent magnet 3 can be prevented from leaking from the rotor 1 in the axial direction. Thereby, the output efficiency of the permanent magnet type rotating electrical machine 10 can be improved.

  Further, since a non-magnetic metal is used as the material of the end plate 4, it is easy to obtain sufficient rigidity of the end plate 4 even if the thickness is reduced compared to the case of using a resin or the like. Weight reduction can be achieved. Furthermore, heat can be radiated through the end plate 4 made of a non-magnetic metal, and the heat dissipation of the rotating body 1 can be further improved.

  As described above, according to this example, it is possible to provide a rotor of a permanent magnet type rotating electrical machine that is excellent in heat dissipation and easy in weight reduction, and a permanent magnet type rotating electrical machine including the same.

(Example 2)
In this example, as shown in FIGS. 6 to 8, the end plate 4 is configured by a plurality of divided plates 40 divided in the circumferential direction.
That is, in the rotor 1 of this example, each of the end plates 4 arranged at both ends in the axial direction is constituted by a plurality of divided plates 40. And the some division | segmentation plate 40 has a shape which divided | segmented the annular end plate 4 shown in Example 1 (FIG. 2) in the circumferential direction. That is, in each divided plate 40, the outer peripheral edge 41 and the inner peripheral edge 42 have an arc shape that is a part of a circle around the rotation center axis of the rotor 1.

Each divided plate 40 is a pair of adjacent permanent magnets 3 and is disposed so as to cover a pair of permanent magnets 3 constituting one magnet pair 30 from the axial direction at a time. And the division | segmentation plate 40 is distribute | arranged so that the permanent magnet 3 may be covered partially.
Further, as shown in FIG. 7, each divided plate 40 is fixed to the rotor core 2 by the rivet 11 together with the divided plate 40 of the end plate 4 arranged on the opposite side of the rotor 1 in the axial direction. The rivet 11 penetrates the pair of divided plates 40 and the rotor core 2 therebetween, and caulks the pair of divided plates 40 from the outside in the axial direction. The rivet 11 penetrates the rotor core 2 in the axial direction at a peninsula portion 23 of the rotor core 2, that is, at a portion between the pair of permanent magnets 3 constituting the magnet pair 30 and the outer peripheral edge of the rotor core 2. . By arranging the rivet 11 at this position, the magnetic steel plate 20 is prevented from warping in the bridge portion 22 formed between the inner peripheral side end portions 212 of the pair of magnet housing holes.

Further, as shown in FIG. 8, bent portions 43 bent in the axial direction are formed at both ends in the circumferential direction of the dividing plate 40, and the bent portions 43 are formed in the communication portion 211 of the magnet accommodation hole 21. The permanent magnet 3 is locked to the side surface. Thereby, it is possible to prevent the divided plate 40 from being displaced in the rotational direction around the rivet 11 with respect to the rotor core 2.
Others are the same as in the first embodiment.

In the case of this example, the volume of the end plate 4 can be reduced and the weight thereof can be reduced. Thereby, further weight reduction of the rotor 1 can be achieved. That is, the inertia of the rotor 1 can be further reduced, and the responsiveness of the permanent magnet type rotating electrical machine 10 can be further improved.
In addition, the same effects as those of the first embodiment are obtained.

(Example 3)
In this example, as shown in FIGS. 9 and 10, each of the divided plates 40 constituting the end plate 4 partially has a contour along the shape of the permanent magnet 3.
That is, also in this example, each divided plate 40 is disposed so as to cover a pair of permanent magnets 3 constituting one magnet pair 30 from the axial direction at a time. The split plate 40 includes two magnet pressing portions 44 that cover the permanent magnet 3 housed in the magnet housing hole 21 of the rotor core 2. Moreover, the division | segmentation plate 40 has the connection part 45 formed between both so that the two magnet pressing parts 44 might be connected. The magnet pressing portion 44 is disposed so as to cover the entire surface of the permanent magnet 3 from the axial direction.
However, the magnet pressing portion 44 is disposed so as to expose the opening portion of the axial hole 24 formed facing the inner peripheral side corner portion 312 of the permanent magnet 3.

Further, as in the second embodiment, the split plate 40, together with the split plate 40 of the end plate 4 disposed on the opposite side in the axial direction of the rotor 1, with respect to the rotor core 2 as shown in FIG. It is fixed by. The rivet 11 is caulked at a connecting portion 45 in the divided plate 40.
The rivet 11 penetrates the pair of divided plates 40 and the rotor core 2 therebetween, and caulks the pair of divided plates 40 from the outside in the axial direction. Further, the rivet 11 penetrates the rotor core 2 in the axial direction in the peninsula portion 23 of the rotor core 2.

As shown in FIG. 10, the divided plate 40 has a step in the thickness direction between the pair of magnet pressing portions 44 and the connecting portion 45. The permanent magnet 3 is arranged such that the end face in the axial direction is slightly inside the end face of the rotor core 2 in the axial direction. That is, in the opening of the magnet housing hole 21, a recess 214 having the end surface of the permanent magnet 3 as the bottom surface is formed. A magnet presser 44 is disposed in the recess 214. Thus, when the divided plate 40 has the step, the magnet pressing portion 44 is disposed in the concave portion 214, and the permanent magnet 3 can be pressed from the axial direction. Thereby, it is possible to prevent the divided plate 40 from being displaced in the rotational direction around the rivet 11 with respect to the rotor core 2.
Others are the same as in the first embodiment.

In the case of this example, the volume of the end plate 4 can be reduced and almost the entire surface of the permanent magnet 3 can be pressed from the axial direction. Therefore, it is possible to reliably prevent the permanent magnet 3 from jumping out of the rotor core 2 while reducing the weight of the end plate 4. That is, the weight of the rotor 1 can be made sufficiently small while enhancing the function of pressing the permanent magnet 3.
In addition, the same effects as those of the first embodiment are obtained.

Example 4
As shown in FIG. 11, this example is an example of the rotor 1 in which an axial hole 24 formed independently of the magnet housing hole 21 is arranged on the inner peripheral side of the annular end plate 4.
That is, the rotor core 2 is provided with a plurality of axial holes 24 in a portion radially inward of the portion where the magnet housing holes 21 are formed. The plurality of axial holes 24 are formed side by side in a circumferential shape.
Moreover, the end plate 4 is arrange | positioned by the annular | circular shape so that the permanent magnet 3 may be covered from an axial direction similarly to Example 1. FIG. A plurality of axial holes 24 are formed inside the inner peripheral edge 42 of the annular end plate 4 and outside the shaft hole 25.
Others are the same as in the first embodiment.

In the case of this example, it becomes easy to arrange the end plate 4 so as to cover the permanent magnet 3 from the axial direction while not closing the opening of the axial hole 24. Therefore, the permanent magnet 3 can be pressed from the axial direction with a sufficient area while the opening of the axial hole 24 is sufficiently exposed.
In addition, the same effects as those of the first embodiment are obtained.

  In addition to the above-described examples, various embodiments are conceivable, such as an embodiment in which Example 1 and Example 4 are combined.

DESCRIPTION OF SYMBOLS 1 Rotor 10 Permanent magnet type rotary electric machine 2 Rotor 20 Magnetic steel plate 24 Axial hole 3 Permanent magnet 4 End plate

Claims (7)

A rotor of a permanent magnet type rotating electrical machine having a rotor core formed by laminating a plurality of magnetic steel plates, and a plurality of permanent magnets embedded in the axial direction of the rotating shaft with respect to the rotor core,
The rotor core has an axial hole that opens in the axial direction on the inner peripheral side of the permanent magnet,
A pair of end plates that sandwich the rotor core from the axial direction are disposed at both axial ends of the rotor core,
The end plate is disposed so as to cover at least part of the permanent magnet and to expose at least part of the opening of the axial hole.   The rotor of the permanent magnet type rotating electrical machine according to claim 1, wherein the end plate is annular, and is arranged so as to expose at least a part of the opening of the axial hole on the inner peripheral side of the end plate. A permanent magnet type rotary electric rotor characterized by that.   The rotor of a permanent magnet type rotating electrical machine according to claim 1 or 2, wherein the axial hole passes through the rotor core in the axial direction.   The rotor of the permanent magnet type rotating electric machine according to any one of claims 1 to 3, wherein the axial hole is formed continuously with a magnet housing hole for housing the permanent magnet in the rotor core. A rotor for a permanent magnet type rotating electrical machine.   The rotor of the permanent magnet type rotating electrical machine according to any one of claims 1 to 4, wherein the end plate covers the entire permanent magnet. .   The rotor of a permanent magnet type rotating electrical machine according to any one of claims 1 to 5, wherein the end plate is made of a non-magnetic material.   A permanent magnet type rotating electrical machine comprising the rotor of the permanent magnet type rotating electrical machine according to any one of claims 1 to 6 and a stator disposed on an outer periphery of the rotor.

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