JP4424385B2 - Rotating electric machine - Google Patents

Description

  The present invention relates to a rotating electrical machine, and relates to a rotating electrical machine having a rotor provided with a permanent magnet.

  Conventionally, in electric motors and rotating electrical machines, permanent magnet cooling, rotor weight reduction, and the like have been attempted. For example, Japanese Patent Laid-Open No. 2005-20855 proposes an electric motor in which the weight of the electric motor is reduced without reducing the electric motor output. In the electric motor, a trapezoidal through-hole is formed in a portion of the rotor core located on the inner diameter side from the central portion of the permanent magnet. Thereby, an area is expanded to a through-hole without obstructing the flow of magnetic flux lines, and a high-power and lightweight electric motor is provided.

  Japanese Patent Laid-Open No. 2002-345188 proposes a rotating electrical machine that efficiently cools a permanent magnet without reducing the output of the rotating electrical machine. In this rotating electrical machine, the outer peripheral side surface of the permanent magnet is in close contact with the permanent magnet insertion hole, and a cooling passage through which the refrigerant is guided along the permanent magnet insertion hole is formed inside the permanent magnet. The cooling system including this cooling passage is a closed circuit. Further, in JP-A-2002-345188, an upstream side passage and a downstream side passage are formed at the axis of the rotating shaft, and the end plate is formed so as to communicate with the cooling passage. A rotating electrical machine having a branch passage is described.

Furthermore, Japanese Patent Laying-Open No. 2006-25545 provides a rotating electric machine that prevents a reduction in insulation of a stator winding by cooling liquid splashed from the rotor. In this rotating electrical machine, a guide path is provided between the rotating shaft and rotor core of the rotor and the end plate, and the cooling oil supplied into the rotating shaft by this guide path is based on the rotational centrifugal force. It is guided to the outer surface side of the outer peripheral side of the end plate and scattered toward the end of the stator winding.
JP 2005-20855 A JP 2002-345188 A JP 2006-25545 A

  However, in the electric motor described in Japanese Patent Application Laid-Open No. 2005-20855, a coolant for cooling the rotor, a lubricating oil for ensuring the lubrication of the bearing, etc. enter the through hole formed in the trapezoidal shape. There was a problem that the balance of the center of gravity of the rotor deteriorated.

  In the rotating electrical machine described in Japanese Patent Laid-Open No. 2002-345188, the rotating system is a rotating electrical machine in which the cooling system is a closed circuit, and when external lubricating oil or refrigerant enters the cooling passage, The weight balance will be lost. Further, in a rotating electrical machine in which a branch passage is formed in the end plate, the supply amount supplied in the lower branch passage is larger than the supply amount supplied in the upper branch passage. As a result, the balance of the rotor is lost. Furthermore, in the rotating electrical machine described in Japanese Patent Application Laid-Open No. 2006-25545, a permanent magnet cooling effect cannot be obtained.

  The present invention has been made in view of the problems as described above, and an object thereof is to provide a rotating electrical machine in which cooling of a permanent magnet, weight reduction of a rotor, and suppression of variation in rotor weight balance are achieved. That is.

A rotating electrical machine according to the present invention includes an annularly formed stator, a rotor that is inserted into the stator and fixed to a rotating shaft, and is rotatably supported, and a plurality of magnets that are formed in the rotor and can receive magnets. A receiving part and a magnet provided in the rotor and mounted in the magnet receiving part are provided.

In addition, the rotating electrical machine is provided at a position away from the magnet receiving portion of the rotor, extends in the axial direction, and is provided on the end surface in the axial direction of the rotor. A path that is defined by at least one of the end plate, the axial end surface of the rotor, and the end plate, and passes from the opening of the hole portion to the axial end surface of the magnet, the axial end surface of the rotor, and the end plate And a discharge port that communicates with the route. The magnet receiving portion includes a first accommodation hole and a second accommodation hole located on the front side in the rotational direction with respect to the first accommodation hole, and a thin portion is formed between the first accommodation hole and the second accommodation hole. Is done. Further, a thick wall portion having higher rigidity than the thin wall portion is formed between the magnet housing portions, and a partition wall portion that partitions the hole portions is formed between the hole portions. And the said hole part is located in a radial direction inner side with respect to a thick part, and a partition wall part is located in a radial direction inner side with respect to a thin part. The end plate includes a path defining part that closes a part of the opening of the hole and defines a part of the opening as a circulation port through which the refrigerant can flow, and the path defining part is an axial end surface of the rotor Among them, an annular portion formed in an annular shape so as to cover a portion located around the rotating shaft, and a plurality of annular portions projecting in the radial direction of the rotor from the peripheral portion of the annular portion and spaced apart in the circumferential direction. Including protrusions. The tip of the protrusion is positioned radially inward from the magnet receiving portion on the axial end surface of the rotor, and the path is defined by the protrusions adjacent in the circumferential direction and communicates with the flow port. The passage includes a discharge path that is located radially outward from the protrusion and that passes through the axial end surface of the magnet and communicates with the communication path and the discharge port. Preferably, the hole is located on the rotation center side of the rotor with respect to the magnet. Preferably, the discharge port is located at the outer peripheral edge of the rotor.

  Preferably, the end plate includes a guide portion capable of guiding the coolant supplied from the hole portion into the path to the end surface of the magnet.

Preferably, flow through ports, with respect to the magnet are provided at positions displaced in the circumferential direction of the rotor.

  Preferably, the opening of the through hole is formed such that the circumferential length increases from the radially inner side of the rotor toward the radially outer side.

  According to the rotating electrical machine according to the present invention, the permanent magnet can be cooled, and the weight of the rotor can be reduced and the weight balance of the rotor can be made uniform.

  A rotating electrical machine 100 according to an embodiment of the present invention will be described with reference to FIGS. In addition, about the same or an equivalent structure, the same code | symbol is attached | subjected and the description is abbreviate | omitted. Note that in the embodiments described below, when referring to the number, amount, and the like, the scope of the present invention is not necessarily limited to the number, amount, and the like unless otherwise specified. In the following embodiments, each component is not necessarily essential for the present invention unless otherwise specified. In addition, when there are a plurality of embodiments below, it is planned from the beginning to appropriately combine the features of each embodiment unless otherwise specified.

(Embodiment 1)
FIG. 1 is a side sectional view of a rotating electrical machine 100 according to Embodiment 1 of the present invention. The rotating electrical machine has at least one of a function as a motor and a function as a generator, and has a function as a motor generator.

  The rotating electrical machine 100 includes a rotating shaft 10 that is rotatably supported, a rotor 20 fixed to the rotating shaft 10, and a stator 12 that is disposed on the outer periphery of the rotor 20 and formed in an annular shape. .

  The stator 12 is formed in an annular shape, and a stator core 14 formed by laminating a plurality of electromagnetic steel plates, and a coil 13 wound around stator teeth formed on the inner peripheral surface of the stator core 14 at a plurality of intervals. It has. Coil 13 includes a U-phase coil, a V-phase coil, and a W-phase coil.

  The rotor 20 includes a rotor core 21 in which a plurality of electromagnetic steel plates are laminated, a permanent magnet 22 attached to the rotor core 21, and an end plate 23 provided at an axial end of the rotor core 21. The rotor core 21 is formed by laminating a plurality of magnetic steel plates. A plurality of permanent magnet accommodation holes 32 extending along the rotation axis O of the rotary shaft 10 are formed in the rotor core 21 at intervals in the circumferential direction.

  The permanent magnet accommodation hole 32 is filled with a permanent magnet 22 and a resin that adheres the permanent magnet 22 to the inner wall surface of the rotor core 21 that defines the permanent magnet accommodation hole 32.

  A plurality of through holes 31 are formed in a portion located radially inward of the rotor core 21 with respect to the permanent magnet 22 and the permanent magnet accommodation hole 32. Thus, since the rotor core 21 is formed with the plurality of through holes 31, the rotor core 21 is reduced in weight.

  An end plate 23 is provided on the end surface of the rotor core 21 in the axial direction. A path 33 is formed in the end plate 23 from the opening of the through hole 31 through the axial end surface of the permanent magnet 22.

  2 is a cross-sectional view taken along the line II-II shown in FIG. Here, the permanent magnet housing hole 32 includes a housing hole 32A that is inclined inward from the radially outer side of the rotor core 21 toward the rotational direction P of the rotor 20, and a front side in the rotational direction P with respect to the housing hole 32A. And an accommodation hole 32B located on the side. The accommodation hole 32 </ b> B is formed so as to incline from the inner side in the radial direction of the rotor core 21 toward the outer side in the rotation direction P. Permanent magnets 22A and 22B are housed in the housing holes 32A and 32B, respectively. The permanent magnets 22 accommodated in the permanent magnet accommodation holes 32 adjacent to each other in the circumferential direction of the rotor core 21 have different magnetic poles arranged toward the outer periphery of the rotor core 21.

  FIG. 3 is an enlarged cross-sectional view of a part of FIG. As shown in FIG. 3, the accommodation hole 32 </ b> A and the accommodation hole 32 </ b> B of the permanent magnet accommodation hole 32 are slightly separated from each other in the circumferential direction of the rotor core 21. For this reason, the thin-walled portion 36 is defined in a portion located between the accommodation hole 32A and the accommodation hole 32B by the accommodation hole 32A and the accommodation hole 32B. The thin portion 36 extends in the radial direction of the rotor core 21.

  A thick portion 37 is defined in a portion of the rotor core 21 located between the permanent magnet accommodation holes 32.

  In the rotor core 21, through holes 31 </ b> A and 31 </ b> B are formed at intervals in the circumferential direction of the rotor core 21 at a portion located radially inward of the rotor core 21 with respect to the permanent magnet accommodation hole 32. In the rotor core 21, a partition wall 70 that partitions the through holes 31 is formed between the through holes 31. Each through-hole 31 is located radially inward of the rotor core 21 with respect to the thick portion 37. That is, the thin portion 36 and the partition wall 70 are arranged in the radial direction of the rotor core 21.

  Furthermore, the partition wall 70 defined between the through holes 31 is located radially inward with respect to the thin portion 36. A through hole 31 is formed in a portion located radially inward with respect to the thick portion 37.

  The through hole 31 is formed in a substantially sector shape so that the size in the circumferential direction of the rotor core 21 increases from the radially inner side to the outer side of the rotor core 21. For this reason, the partition wall 70 located between each through-hole 31 is formed so that it may extend in the radial direction of the rotor core 21.

  As described above, the portion of the rotor core 21 where the thin portion 36 is located has low rigidity, while the partition wall 70 is located in the radial direction, whereby the portion where the thin portion 36 is located has radial rigidity. Can be secured.

  On the other hand, since the rigidity of the thick part 37 is high, even if the through hole 31 is formed on the radially inner side with respect to the thick part 37, the rigidity can be ensured.

  For this reason, the circumferential direction center part of the rotor core 21 of each through-hole 31 is located in the position which shifted | deviated to the circumferential direction with respect to the center part of the circumferential direction of accommodation hole 32A, 32B.

  A path 33 is defined on the axial end surface of the rotor core 21 by the axial end surface of the rotor core 21 and the end plate 23.

  Here, as shown in FIGS. 1 and 3, the end plate 23 is formed on a top plate portion 124 formed in a disc shape and a peripheral portion of the top plate portion 124, and is spaced apart in the circumferential direction. And a formed peripheral wall portion 123.

  Each peripheral wall portion 123 is located radially outward of the rotor core 21 with respect to the thin portion 36.

  Here, a path defining portion 133 that defines the path 33 is formed on the surface of the top plate portion 124 that faces the axial end surface of the rotor core 21.

  The path defining portion 133 includes an annular portion 133B formed in an annular shape so as to cover a portion located around the rotary shaft 10 of the axial end surface of the rotor core 21, and a peripheral portion of the annular portion 133B. A plurality of protrusions 133A that protrude in the radial direction and that are formed at intervals in the circumferential direction are provided.

  A path 33 is defined on the end face in the axial direction of the rotor core 21 by the projecting portion 133 </ b> A adjacent in the circumferential direction and the peripheral wall portion 123.

  Here, the circumferentially adjacent protrusions 133 </ b> A define a communication path 134 that communicates part of the openings of the through holes 31 </ b> A and 31 </ b> B adjacent in the circumferential direction and further extends in the radial direction of the rotor core 21. Yes.

  Then, due to the path defining portion 133, part of the openings of the through holes 31 </ b> A and 31 </ b> B are positioned as supply ports 131 </ b> A and 131 </ b> B in the communication path 134.

  For this reason, refrigerant or lubricating oil may enter the through hole 31 from the gap between the end plate 23 and the axial end surface of the rotor core 21, but the lubricating oil or refrigerant in the through hole 31 is supplied into the path 33 ( Since the supply ports 131 </ b> A and 131 </ b> B that can be discharged) are defined, the refrigerant and the lubricating oil can be discharged from the through hole 31.

  In particular, the communication path 134 extends from the supply ports 131 </ b> A and 131 </ b> B outward in the radial direction of the rotor core 21. Therefore, the lubricating oil or refrigerant that has entered the communication path 134 from the supply ports 131 </ b> A and 131 </ b> B flows out into the communication path 134 due to the centrifugal force of the rotor core 21. Thus, since the lubricating oil and refrigerant in each through hole 31 can be discharged into the path 33, the amount of accumulated lubricating oil and refrigerant in each through hole 31 can be reduced, and each through hole can be reduced. The difference in the amount of refrigerant and lubricating oil stored in 31 can be reduced.

  For this reason, it is possible to suppress the occurrence of bias in the weight balance in the rotor 20. Thereby, even when the rotating electrical machine is driven, vibration of the rotor 20 can be suppressed.

  The tip of the protrusion 133A is located radially inward from the permanent magnet accommodation hole 32 in the axial end surface of the rotor core 21, and the protrusion 133A extends toward the circumferential end of the peripheral wall 123. ing.

  For this reason, in the path 33, the portion located on the radially outer side of the rotor core 21 with respect to the protrusion 133 </ b> A intersects the extending direction of the communication path 134 (the radial direction of the rotor core 21). A discharge path 135 extending in the direction is defined. The discharge path 135 is formed so as to pass on the axial end surfaces of the permanent magnets 22A and 22B. And the discharge port 33a which discharges | emits the lubricating oil and refrigerant | coolant in the discharge path 135 outside by the surrounding wall part 123 adjacent to the circumferential direction of the rotor core 21 is prescribed | regulated.

  For this reason, the lubricating oil or refrigerant that has entered the communication path 134 flows in the communication path 134 in the radial direction of the rotor core 21. Thereafter, the lubricating oil and refrigerant enter the discharge path 135. The refrigerant and lubricating oil that have entered the discharge path 135 flow in the circumferential direction of the rotor core 21 while cooling the axial end surfaces of the permanent magnets 22A and 22B. Thereafter, lubricating oil and refrigerant are discharged from the discharge port 33a.

  Here, the discharge port 33 a is defined on both the front side in the rotation direction P and the rear side in the rotation direction P with respect to each communication path 134.

  Therefore, for example, when driving of the rotating electrical machine is started and the rotor 20 starts to rotate in the rotation direction P, the refrigerant and the lubricating oil from the supply ports 131A and 131B in FIG. It discharges | emits from the discharge port 33a2 located in the back side of the rotation direction P with respect to the channel | path 134A. At this time, for example, in the example shown in FIG. 3, the axial end surface of the permanent magnet 22 </ b> A is cooled by lubricating oil or a refrigerant.

  On the other hand, when the rotor 20 decelerates, for example, refrigerant and lubricating oil from the communication path 134A are discharged from the discharge port 33a1 located on the front side in the rotation direction P with respect to the communication path 134A. . At this time, the permanent magnet 22B located on the discharge port 33a1 side is cooled. Here, since the rotating electrical machine is accelerated or decelerated, it is discharged from at least one of the discharge ports 33a1 and 33a2 and can cool the axial end surfaces of the permanent magnets 22A and 22B.

  The end surface of the permanent magnet 22 in the axial direction and the end plate 23 are separated from each other, and the end plate 23 is made of a metal material such as aluminum, for example. Thus, by separating the metal end plate 23 and the permanent magnet 22, it is possible to suppress the generation of eddy currents that occur in the end plate 23 during driving of the rotating electrical machine.

  One projecting portion 133A and a projecting portion 133A adjacent to the projecting portion 133A in the circumferential direction are continuously provided, and a root portion 133C located at the outer peripheral edge of the annular portion 133B extends in the circumferential direction of the rotor 21. ing.

  Then, the side surfaces 136a and 136b of the protrusions 133A adjacent to each other are smoothly curved toward the radially outer side of the rotor core 21 so that the circumferential distance of the rotor core 21 increases.

  For this reason, the lubricating oil or refrigerant that has entered the path 33 from the supply ports 131A and 131B flows in the communication path 134 well and can be discharged from the discharge port 33a.

(Embodiment 2)
A rotating electrical machine according to Embodiment 2 of the present invention will be described with reference to FIGS. 1, 4, and 5. In addition, about the structure which is the same as that of the structure shown by the said FIGS. 1-3, or the same structure, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  4 is a cross-sectional view showing a rotor 20 of a rotating electrical machine according to Embodiment 2 of the present invention, and FIG. 5 is an enlarged view of a part of FIG.

  Here, the end plate 23 is formed on the top plate portion 124 and the top plate portion 124, is formed on the outer peripheral edge portion of the path defining portion 144 and the top plate portion 124, and hangs toward the axial end surface of the rotor core 21. And a peripheral wall portion 123.

  As shown in FIG. 5, a plurality of path defining portions 144 are formed around the rotating shaft 10, and an annular portion 144 </ b> B that contacts the axial end surface of the rotor core 21, and a plurality of the path defining portions 144 are formed on the outer periphery of the annular portion 144 </ b> B with an interval. , And a protruding portion 144 </ b> A protruding in the radial direction of the rotor core 21. Then, the projecting portion 144A and the peripheral wall portion 123 are in contact with the axial end surface of the rotor core 21, so that the lubricating oil or refrigerant that has entered the through hole 31 on the axial end surface of the rotor core 21 is discharged to the outside. 43 is defined.

  Here, a part of the supply port 141 is defined at the opening of each through hole 31 by the protruding portion 144A and the annular portion 144B.

  Here, the projecting portion 144A includes a first side portion 145b extending radially outward from a portion located on the front side in the rotation direction P of the root portion of the projecting portion 144A, and the first side portion 145b. It is connected to the upper end portion, and as it goes radially outward, the inclined portion 145a is inclined toward the rear side in the rotational direction P, and is connected to the end portion of the inclined portion 145a, and extends toward the annular portion 144B. And two sides. And between the inclination part 145a and the surrounding wall part 123, the discharge path 145 which inclines toward radial direction outward toward the rotation direction P back side and reaches the discharge port 33a2 is prescribed | regulated.

  Here, permanent magnets 22 </ b> A and 22 </ b> B are arranged in a portion located between the inclined portion 145 a and the peripheral wall portion 123.

  For this reason, when the rotor 20 accelerates in the rotation direction P, the lubricating oil, refrigerant, and the like accumulated in the through hole 31 are located on the rear side in the rotation direction P with respect to the supply port 141 from the supply port 141. The lubricating oil and refrigerant are discharged from the discharge port 33a2 through the discharge path 145. At this time, the axial end face of the permanent magnet 22 is cooled when passing through the discharge path 145.

  Further, when the rotor 20 decelerates, lubricating oil, refrigerant, and the like accumulated in the through hole 31 enter the path 43 from the supply port 141, are guided to the first side portion 145c, and are discharged from the discharge port 33a1. The Even when discharged in this way, the lubricating oil and the refrigerant cool the axial end surface of the permanent magnet 22.

  Thus, also in the rotating electrical machine according to the second embodiment, since the lubricating oil and refrigerant in each through hole 31 can be discharged, it is possible to suppress the occurrence of variation in the weight balance of the rotor core 21.

(Embodiment 3)
A third embodiment according to the present invention will be described with reference to FIGS. 1, 6, and 7. FIG. In addition, about the structure which is the same as that of the structure shown in FIGS. 1-5, or equivalent, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  6 is a cross-sectional view of a rotor of a rotating electrical machine according to Embodiment 3 of the present invention, and FIG. 7 is an enlarged view of a part of FIG.

  As shown in FIGS. 1 and 6, the end plate 23 includes a top plate portion 124 and a peripheral wall portion 123 that hangs from the peripheral edge portion of the top plate portion 124 toward the axial end surface of the rotor core 21.

  A path defining portion 153 that defines a path 53 on the axial end surface of the rotor core 21 is formed on the side surface of the end plate 23 that faces the axial end surface of the rotor core 21.

  The path defining portion 153 is connected to an annular portion 153B formed so as to cover a portion located around the rotary shaft 10 in the axial end surface of the rotor core 21, and an outer peripheral edge portion of the annular portion 153B. And a protrusion 153 </ b> A that protrudes outward in the radial direction of the rotor core 21.

  The protrusion 153 </ b> A extends so as to cover the upper surface of the partition wall 70 among the axial end surfaces of the rotor core 21. For this reason, it is possible to suppress the partition wall 70 from being deformed by the stress generated in the partition wall 70 when the rotor 20 is rotating.

  In the rotating electrical machine according to the third embodiment, the end surface of the permanent magnet 22 can be cooled when the refrigerant in the through hole 31 is discharged.

  Although the embodiment of the present invention has been described above, it should be considered that the embodiment disclosed this time is illustrative and not restrictive in all respects. The scope of the present invention is defined by the terms of the claims, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  The present invention is suitable for a rotating electrical machine.

It is a sectional side view of the rotary electric machine of Embodiment 1 which concerns on this invention. It is sectional drawing in the II-II line shown in FIG. FIG. 3 is a cross-sectional view in which a part of FIG. 2 is enlarged. It is sectional drawing which shows the rotor of the rotary electric machine of Embodiment 2 which concerns on this invention. FIG. 5 is an enlarged view in which a part of FIG. 4 is enlarged. It is sectional drawing of the rotor of the rotary electric machine of Embodiment 3 which concerns on this invention. FIG. 7 is an enlarged view in which a part of FIG. 6 is enlarged.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 Rotating shaft, 12 Stator, 13 Coil, 14 Stator core, 20 Rotor, 21 Rotor core, 22, 22A, 22B Permanent magnet, 23 End plate, 31, 31A, 31B Through hole, 32A, 32B Housing hole, 32 Permanent magnet housing hole , 33, 43, 53 path, 100 rotating electric machine, 123 peripheral wall.

Claims (6)

An annularly formed stator;
A rotor inserted into the stator , fixed to a rotating shaft, and rotatably supported;
A plurality of magnet receiving portions formed on the rotor and capable of receiving magnets;
A magnet provided in the rotor and mounted in the magnet receiving portion;
Among the rotor, a plurality of holes provided at a position away from the magnet receiving portion, extending in the axial direction and spaced apart in the circumferential direction;
An end plate provided on an axial end surface of the rotor;
A path that is defined by at least one of the axial end face of the rotor and the end plate and that passes from above the opening of the hole through the axial end face of the magnet;
A discharge port that is defined by at least one of the axial end surface of the rotor and the end plate and communicates with the path;
With
The magnet receiving portion includes a first accommodation hole and a second accommodation hole located on the front side in the rotation direction with respect to the first accommodation hole,
A thin portion is formed between the first accommodation hole and the second accommodation hole,
A thick part having a higher rigidity than the thin part is formed between the magnet housing parts,
A partition wall that partitions the holes is formed between the holes,
The hole is located on the radially inner side with respect to the thick part,
The partition wall portion is located radially inward with respect to the thin wall portion ,
The end plate includes a path defining portion that closes a part of the opening of the hole and defines a part of the opening as a circulation port through which the refrigerant can flow.
The path defining portion includes an annular portion formed in an annular shape so as to cover a portion of the rotor axial end surface located around the rotating shaft, and a peripheral portion of the annular portion. And a plurality of protrusions formed at intervals in the circumferential direction,
The tip of the protruding portion is located radially inward from the magnet receiving portion of the axial end surface of the rotor,
The path is defined by the protrusions adjacent to each other in the circumferential direction, is located on a radially outward side from the protrusion, a communication path communicating with the flow port, and passes through an axial end surface of the magnet, A rotating electrical machine including a communication path and a discharge path communicating with the discharge port .   The rotating electrical machine according to claim 1, wherein the hole is positioned on a rotation center side of the rotor with respect to the magnet.   The rotating electrical machine according to claim 1, wherein the discharge port is located at an outer peripheral edge portion of the rotor.   4. The rotating electrical machine according to claim 1, wherein the end plate includes a guide portion capable of guiding a refrigerant supplied into the path from the hole portion to an end surface of the magnet. Before SL circulation port, relative to the magnet, provided in a position shifted in the circumferential direction of the rotor, rotating electrical machine according to any one of claims 1 to 4.   The opening portion of the through hole is formed so that a length in a circumferential direction increases from a radially inner side of the rotor toward a radially outer side. Rotating electric machine.

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