JP2013183483A - Cooling structure of rotor for rotary electric machine and rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cooling structure of a rotor for a rotary electric machine that prevents entry of a cooling liquid from coolant passages inside a rotor core into between magnetic steel sheets and reduces drag loss.SOLUTION: A cooling structure of a rotor for a rotary electric machine includes: a rotatable shaft 22 that supplies a cooling liquid flowing therein, to the outside; coolant passage holes 34 that are fixedly fitted onto the shaft 22 and allow the cooling liquid supplied from the shaft 22 to flow in an axial direction of the rotary electric machine; and a rotor core 20 that has a plurality of magnetic plates laminated in the axial direction of the rotary electric machine. A seal member 52 that prevents entry of the cooling liquid into between the magnetic plates is provided on a radially outer portion, with respect to a radial direction of the rotor core 20, of an inner circumferential surface of each coolant passage hole 34.

Description

  The present invention relates to a rotating electrical machine rotor cooling structure and a rotating electrical machine including the same, and more particularly to a rotating electrical machine rotor cooling structure that cools a rotor core with a coolant supplied from a shaft.

  Conventionally, a rotor of a motor configured by laminating electromagnetic steel sheets is cooled with cooling oil. For example, Japanese Unexamined Patent Application Publication No. 2009-71923 (hereinafter referred to as Patent Document 1) solves the problem that the pump provided outside the electric motor can be provided in the electric motor to have a compact configuration. A cooling structure for an electric motor as a problem is disclosed.

  In the cooling structure of the electric motor, a plurality of cooling oil passages that pass through the vicinity of a plurality of permanent magnets arranged in the rotor core and penetrate the rotor core vertically are formed. An annular groove communicating with each cooling oil passage is formed in the lower surface portion of the lower plate, and the annular groove communicates with a discharge port of a pump that is in close contact with the lower plate. The pump is configured as a rotor shaft drive shaft and can pump oil in an oil sump formed at the bottom of the motor housing into each cooling oil passage. Accordingly, it is described that the oil ejected from each cooling oil passage can cool the stator coil and the upper coil end of the stator core.

JP 2009-71923 A

  In the cooling structure of the electric motor described in Patent Document 1, a cooling oil passage is formed by extending in the axial direction in a rotor core configured by laminating a plurality of electromagnetic steel plates. Therefore, the cooling oil enters the gaps between the electromagnetic steel plates from the cooling oil passage by the centrifugal force when the rotor rotates, flows outward in the radial direction, and flows out to the gap portion between the rotor and the stator. If it does so, a rotor will be driven in the state where cooling oil intervened in a gap part, and it will become a rotation resistance of a rotor, and output loss (henceforth "drag loss") of a motor will generate | occur | produce.

  The objective of this invention is providing the cooling structure of the rotor for rotary electric machines which can suppress a drag | invasion of the cooling fluid from the refrigerant flow path in a rotor core between electromagnetic steel plates, and can reduce a drag loss.

  A cooling structure for a rotor for a rotating electrical machine according to an aspect of the present invention includes a rotatable shaft that supplies a coolant flowing inside to the outside, a fitting shaft that is externally fitted and fixed to the shaft, and a coolant supplied from the shaft. A rotor core having a refrigerant flow path hole for flowing in the axial direction of the motor and having a plurality of magnetic plate members laminated in the axial direction of the rotating electrical machine, and having an inner peripheral surface of the refrigerant flow path hole Among them, a seal member for preventing the coolant from entering between the magnetic plate members is provided on the inner peripheral surface on the outer diameter side in the radial direction of the rotor core.

  In the cooling structure for a rotor for a rotating electrical machine according to the present invention, it is preferable that the seal member is provided so as to occupy a region on the outer diameter side in the refrigerant flow path hole and closes a gap between the magnetic plate members.

  Further, in the rotor cooling structure for a rotating electrical machine according to the present invention, a protrusion is formed on an inner peripheral surface of the refrigerant flow path hole, and the protrusion engages with the seal member so that the seal member becomes the refrigerant flow path. It is preferable to hold the hole so as not to peel from the inner peripheral surface of the hole.

  In this case, the protrusion may be formed of two protrusions that protrude from inner wall surfaces on both sides in the circumferential direction of the coolant channel hole, and the two protrusions may engage and hold the seal member radially inward. Alternatively, the protrusion is one protrusion that protrudes from the inner peripheral surface on the outer diameter side of the coolant channel hole, and the one protrusion is embedded as an anchor in the seal member, so that the seal member has the outer diameter. It may be held on the inner peripheral surface of the side.

  Furthermore, in the rotor cooling structure for a rotating electrical machine according to the present invention, the rotor core includes a magnetic pole in which a permanent magnet is embedded, and the refrigerant passage hole has a flux barrier that defines a magnetic flux passage through which a magnetic flux from the permanent magnet passes. It may be configured.

  A rotating electrical machine according to another aspect of the present invention includes a stator that generates a rotating magnetic field, and a rotor that is disposed to face the stator via an air gap and has a cooling structure having any one of the above configurations.

  In the cooling structure for a rotor for a rotating electrical machine according to the present invention, the seal member is provided on the inner peripheral surface on the outer diameter side of the refrigerant flow path. It is possible to prevent the air from entering between the magnetic plates to flow to the radial side and out to the outer peripheral surface of the rotor. Therefore, it is possible to suppress the coolant from interposing in the gap portion between the rotor and the stator when the rotor is rotationally driven, and to improve the output of the rotating electrical machine by reducing the drag loss.

It is an axial sectional view of the rotary electric machine which is one embodiment of the present invention. It is a side view which shows the end surface of the rotor core in FIG. It is a figure which expands and shows one of the magnetic poles contained in the rotor core of FIG. It is a figure corresponding to FIG. 3 which shows another example of the holding | suppressing part of a sealing member. It is a figure corresponding to FIG. 3 which shows another example of the holding | suppressing part of a sealing member. It is a figure corresponding to FIG. 3 which shows another example of the pressing part of a sealing member.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments according to the present invention (hereinafter referred to as embodiments) will be described in detail with reference to the accompanying drawings. In this description, specific shapes, materials, numerical values, directions, and the like are examples for facilitating the understanding of the present invention, and can be appropriately changed according to the application, purpose, specification, and the like. In addition, when a plurality of embodiments and modifications are included in the following, it is assumed from the beginning that these characteristic portions are used in appropriate combinations.

  FIG. 1 is a cross-sectional view along the axial direction of a rotating electrical machine 10 including the rotor cooling structure of the present embodiment. As shown in FIG. 1, the rotating electrical machine 10 includes a stator 12 and a rotor 14. A gap portion G in the radial direction is provided between the stator 12 and the rotor 14.

  The stator 12 includes a stator core 16 made of a magnetic material having a cylindrical shape, and a stator coil wound around a plurality of teeth portions protruding from the inner peripheral portion of the stator core 16 and arranged at equal intervals in the circumferential direction. 18. The stator core 16 is configured by, for example, laminating a plurality of electromagnetic steel sheets each punched into a substantially annular shape in the axial direction and integrally connecting them by at least one of caulking, welding, adhesion, and the like.

  Stator coil 18 includes an in-slot portion (not shown) inserted and disposed between the tooth portions, and coil end portions 18a and 18b projecting outward from the axial end surface of stator core 16. The coil end portions 18a and 18b are formed in a substantially annular shape when viewed from the axial direction.

  The stator 12 including the stator core 16 and the stator coil 18 is accommodated in a cylindrical case (not shown). In the case, at least two bearing members for rotatably supporting a shaft described later are provided on both sides in the axial direction.

  The rotor 14 disposed on the inner peripheral side of the stator core 16 includes a cylindrical rotor core 20 and a shaft 22 that extends through the center of the rotor core 20 in the axial direction. The rotor core 20 is externally fixed to the shaft 22.

  For example, the rotor core 20 is integrally formed by laminating a plurality of electromagnetic steel plates (magnetic plate materials) each punched into a substantially disc shape in the axial direction, and caulking, welding, bonding, or the like. . Further, the rotor core 20 has substantially the same axial length as the stator core 16, and the axial end faces are arranged substantially flush with each other.

  The shaft 22 is rotatably supported at both ends thereof by bearing members attached to a case that houses the rotating electrical machine 10.

  The shaft 22 has a flange portion 24 that protrudes radially outward from the outer peripheral surface. The flange portion 24 abuts on one end surface of the rotor core 20 in the axial direction and has a function of determining the axial position of the rotor core 20 on the shaft 22. Further, a fixing member 26 is fixed on the shaft 22 in a state where the fixing member 26 is in contact with the other axial end surface of the rotor core 20. The fixing member 26 is an annular metal member that is fixed on the shaft 22 by caulking or the like, whereby the movement of the rotor core 20 in the axial direction on the shaft 22 is restricted.

  By forming a convex key at the edge of the shaft hole formed in the center of the rotor core 20 and fitting it into a key groove formed by extending in the axial direction on the outer peripheral surface of the shaft 22, the rotor core with respect to the shaft 22 Twenty circumferential positions can be fixed.

  The rotor core 20 may be externally fixed on the shaft 22 by, for example, shrink fitting, press fitting, or the like, and in that case, the fixing member 26 and the key can be omitted.

  In the shaft 22, a coolant channel 28 for flowing a coolant is formed so as to penetrate in the axial direction. For example, cooling oil is preferably used as the cooling liquid. In FIG. 1, the cooling oil is displayed as ATF (Automatic Transmission Fluid), and the flow of the cooling oil is indicated by arrows. In the following description, it is assumed that the cooling liquid is cooling oil, but the present invention is not limited to this, and any other cooling liquid can be used as long as it can exhibit suitable cooling performance for the rotor core 20 including the permanent magnet. A coolant may be used.

  The refrigerant flow path 28 in the shaft 22 is opened on one end side of the shaft 22, and cooling oil is circulated and supplied from the opening through an oil pump, an oil cooler, and the like (not shown). . Note that the refrigerant flow path 28 in the shaft 22 does not need to penetrate to the other end side of the shaft 22 if only for supplying cooling oil to the rotor core 20. You may terminate around.

  Further, the shaft 22 is formed with a refrigerant supply path 30 that communicates with the internal refrigerant flow path 28 and opens to the outer peripheral surface. The refrigerant supply path 30 is a path for supplying the cooling oil flowing through the shaft 22 to the rotor core 20 by centrifugal force acting when the rotor 14 rotates. A plurality of refrigerant supply paths 30 are formed in the radial direction at intervals in the circumferential direction of the shaft 22.

  In the rotor core 20, a rotor-side refrigerant supply path 32 is formed at a central position in the axial direction. The refrigerant supply path 32 communicates with the refrigerant supply path 30 of the shaft 22 at the inner diameter side end. The refrigerant supply path 30 is formed by machining a notch portion extending in the radial direction in an electromagnetic steel plate corresponding to the central position among a plurality of electromagnetic steel plates constituting the rotor core 20.

  The outer diameter side end of the refrigerant supply path 32 of the rotor core 20 communicates with a refrigerant flow path hole 34 formed in the rotor core 20. The coolant channel hole 34 of the rotor core 20 is formed so as to penetrate the rotor core 20 in the axial direction. That is, the refrigerant flow path hole 34 of the rotor core 20 is opened on the axial end faces 20 a and 20 b of the rotor core 20.

  Further, a seal member 52 is provided in the refrigerant flow path hole 34 of the rotor core 20. In the seal member 52, the cooling oil flowing in the axial direction through the refrigerant flow hole 34 of the rotor core 20 enters or penetrates into the gap between the electromagnetic steel plates constituting the rotor core 20, and flows outward in the radial direction. The outer peripheral surface of the stator core 16 and the inner peripheral surface of the stator core 16 (i.e., the end surface on the inner diameter side of the tooth portion) are prevented from flowing out into the gap portion G.

  Next, the sealing member 52 will be described in detail with reference to FIGS. FIG. 2 is a diagram showing an end surface in the axial direction of the rotor core 20 in FIG. 1, and FIG. 3 is an enlarged diagram showing one of the magnetic poles 38 included in the rotor core 20 in FIG.

  As shown in FIGS. 1 and 2, the rotor 14 of the rotating electrical machine 10 of the present embodiment is an IPM (Interior Permanent Magnet) type rotor in which a permanent magnet 40 is embedded. Specifically, in the rotor 14 of this embodiment, eight magnetic poles 38 are arranged at equal intervals in the circumferential direction on the outer peripheral portion of the rotor core 20, and the N pole and the S pole are formed by two magnetic poles 38 adjacent in the circumferential direction. The four magnetic pole pairs are configured. However, the number of magnetic poles 38 and magnetic pole pairs is not limited to the above.

  As shown in FIG. 2, a circular shaft hole 21 is formed at the center of the rotor core 20. In the example shown in FIG. 2, no key or key groove is formed on the inner periphery of the shaft hole 21. Therefore, the rotor core 20 is fixed to the shaft 22 by shrink fitting or the like.

  Further, a caulking portion 39 is formed between two magnetic poles 38 adjacent in the circumferential direction in the rotor core 20. The caulking portion 39 is formed such that when the electromagnetic steel sheet is punched into an annular shape, one surface is concave and the other surface is half-punched. In this manner, the rotor core 20 is integrally formed by connecting and laminating the electromagnetic steel sheets while fitting the caulking portions 39 formed on the respective electromagnetic steel sheets to each other.

  Each magnetic pole 38 has the same structure. Therefore, the arrangement of the permanent magnet 40 and the seal member 52 for one magnetic pole 38 will be described below with reference to FIG.

  As shown in FIGS. 2 and 3, one permanent magnet 40 is embedded in the vicinity of the outer peripheral surface 20 c of the rotor core 20 in one magnetic pole 38. The permanent magnet 40 is arranged in a posture substantially along the outer peripheral surface of the rotor core 20. The permanent magnet 40 has a flat rectangular cross section and has a plate-like shape having substantially the same axial length as the rotor core 20. The permanent magnet 40 has a magnet insertion hole 46 formed by extending in the axial direction on the rotor core 20. It is inserted and fixed. Further, the permanent magnet 40 is bonded and fixed by filling resin between the inner wall surface of the magnet insertion hole 46.

  On the inner diameter side of the magnetic pole 38, a substantially rectangular refrigerant passage hole 34 is formed. The coolant channel hole 34 is a hole penetrating in the axial direction and includes a low magnetic permeability gap, and thus constitutes a flux barrier in the magnetic pole 38. In this way, the refrigerant flow path holes 34 in the magnetic poles 38 constitute a flux barrier, so that the processing of the electromagnetic steel sheet constituting the rotor core 20 is performed rather than the case where the refrigerant flow path holes 34 and the flux barrier are provided as separate through holes. As a result, it is possible to suppress a decrease in strength of the rotor core 20 with respect to centrifugal force and the like.

  As described above, in the rotor 14 of the present embodiment, the magnetic flux passage 50 formed of the electromagnetic steel plate portion is formed between the permanent magnet 40 provided on the magnetic pole 38 of the rotor core 20 and the refrigerant flow path hole 34.

  A seal member 52 is provided on the inner peripheral surface of the coolant passage hole 34 on the outer peripheral side with respect to the radial direction of the rotor core 20 to prevent the cooling oil from entering between the electromagnetic steel sheets. The seal member 52 is provided so as to occupy a region on the outer diameter side in the inner region of the refrigerant flow path hole 34 and closes the gap between the electromagnetic steel plates.

  The seal member 52 is preferably formed of a material excellent in oil resistance. The seal member 52 is preferably formed of a nonmagnetic material so as not to affect the magnetic characteristics of the rotor 14. Furthermore, the sealing member 52 is preferably non-conductive so as not to electrically connect the laminated electromagnetic steel sheets. For these reasons, the seal member 52 can be suitably formed of, for example, a resin.

  The seal member 52 may be formed, for example, by injecting and filling molten resin into the outer diameter side region of the refrigerant flow path hole 34 and curing the resin, or by molding a molded product that has been previously molded with resin into the rotor core 20. It may be inserted in the axial direction from the end face and adhered and fixed on the inner peripheral surface of the refrigerant flow path hole 34 on the outer diameter side.

  Two protrusions 54 are formed to face each other on the inner wall surfaces on both sides in the circumferential direction of the coolant passage hole 34. More specifically, the protrusion 54 has a substantially rectangular shape, and is integrally formed with the inner wall surfaces 48 and 49 of the refrigerant flow path hole 34. These protrusions 54 are engaged with both end portions in the circumferential direction of the seal member 52 on the radially inner side. Thus, the seal member 52 is pressed by the protrusion 54 so as not to be separated from the inner peripheral surface of the refrigerant flow path hole 34 on the outer diameter side.

  Note that the shape of the refrigerant flow path hole 34 is not limited to the substantially rectangular shape as described above, and can be appropriately set according to the arrangement of the permanent magnets included in the magnetic pole 38, for example, a substantially triangular shape. May be formed.

  Next, the cooling operation in the rotating electrical machine 10 having the above configuration will be described.

  From one end of the shaft 22, the cooling oil pumped by the oil pump is supplied to the refrigerant flow path 28. The cooling oil supplied to the refrigerant flow path 28 flows in the axial direction and is supplied to the refrigerant flow path hole 34 of the rotor core 20 via the refrigerant supply path 30 of the shaft 22 and the refrigerant supply path 32 of the rotor core 20.

  The cooling oil that has flowed into the refrigerant passage hole 34 at the axial center position of the rotor core 20 flows separately on both sides in the axial direction. Then, the cooling oil that has flowed to the axial end faces 20a, 20b of the rotor core 20 flows out of the opening that is the end of the refrigerant flow path hole 34 and is blown outward in the radial direction by the action of centrifugal force. The cooling oil can be applied to the coil end portions 18 a and 18 b of the stator coil 18 wound around the stator 12 to cool the stator coil 18 and thus the stator 12.

  Thus, the cooling oil supplied from the shaft 22 flows in the rotor core 20, so that the rotor core 20 that becomes high temperature due to an eddy current loss due to a fluctuating magnetic flux or the like when the rotating electrical machine 10 is rotated and the permanent magnet 40 embedded in the rotor core 20. Can be effectively cooled, and demagnetization of the permanent magnet can be suppressed.

  In addition, when the cooling oil flows in the axial direction through the refrigerant flow path hole 34 in the rotor core 20, a force that presses radially outward by the action of centrifugal force acts. Therefore, the cooling oil may enter a gap between the electromagnetic steel sheets that constitute the inner wall surface located on the radially outer side of the refrigerant flow path hole 34. Then, when there is no seal member 52, the cooling oil flows out to the outer peripheral surface of the rotor core 20, and as a result, the cooling oil intervenes in the gap portion G between the rotor 14 and the stator 12, and drag loss is caused. Will occur.

  On the other hand, since the seal member 52 is provided on the inner peripheral surface on the radially outer side of the refrigerant flow path hole 34 in the rotor 14 in the present embodiment, the cooling oil is prevented from entering between the electromagnetic steel sheets. This can prevent the cooling oil from flowing out to the outer peripheral surface of the rotor core 20. Therefore, drag loss of the rotating electrical machine 10 caused by the cooling oil interposed in the gap portion G between the rotor 14 and the stator 12 can be reduced.

  Further, since the seal member 52 of this embodiment is pressed by the two protrusions 54 on both sides in the circumferential direction, the seal member 52 peels off from the inner peripheral surface on the outer diameter side of the refrigerant flow path hole 34 and jumps out of the rotor core 20. Can be prevented.

  Next, another example for pressing the seal member 52 will be described with reference to FIG. In this example, the inner wall surfaces 48 and 49 on both sides in the circumferential direction of the refrigerant flow path hole 34 are connected by a pressing portion 55, which is equivalent to the two projections 54 in the above-described embodiment extended and connected.

  In this way, the region in which the seal member 52 is disposed is completely partitioned from the refrigerant flow path hole 34, and the seal member 52 is embedded and disposed near the inner peripheral surface of the refrigerant flow path hole 34 on the outer diameter side. It is good. Also by this, the cooling oil that has entered between the electromagnetic steel plates from the refrigerant flow path hole 34 is blocked by the seal member 52 and can be prevented from flowing to the outer peripheral surface of the rotor core 20.

  Further, since the seal member 52 is pressed by the pressing portion 55, it can be prevented that the seal member 52 is peeled off and dropped from the rotor core 20.

  However, in this case, it is preferable to reduce the influence on the magnetic characteristics by making the width of the pressing portion 55 (that is, the length in the radial direction) as short as possible to make it difficult for the magnetic flux to flow.

  Next, still another example of the pressing portion of the seal member 52 will be described with reference to FIG. As shown in FIG. 5, the coolant channel hole 34 is formed in a substantially rectangular shape, and no protrusions are provided on the inner wall surfaces 48 and 49 on both sides in the circumferential direction. Instead, one protrusion 54 projects from the inner peripheral surface of the refrigerant flow path hole 34 on the outer diameter side. The protrusion 54 has a substantially trapezoidal shape that becomes wider toward the inside in the radial direction, and a seal member 52 is provided on the inner peripheral surface including the periphery of the protrusion 54. In this case, the seal member 52 is preferably formed, for example, by injecting and curing molten resin. The shape of the protrusion 54 may be a shape other than the trapezoidal shape, for example, a mushroom shape, as long as the seal member 52 is a hook shape that restricts the radially inward movement.

  In this example, the seal member 52 is held on the inner peripheral surface of the coolant channel hole 34 with the protrusion 54 embedded therein as an anchor. Therefore, it is possible to prevent the seal member 52 from peeling off and dropping from the rotor core 20.

  In addition, this invention is not limited to embodiment mentioned above and its modification, A various change and improvement are possible within the range of the matter described in the claim of this application.

  For example, in the above description, an example in which each magnetic pole 38 of the rotor 14 includes one permanent magnet 40 has been described. However, the present invention is not limited to this, and two permanent magnets are provided for one magnetic pole 38 as shown in FIG. 40a and 40b may be included, and three or more permanent magnets may be included.

  In the above description, the rotor 14 of the rotating electrical machine 10 has been described as an IPM type rotor in which the permanent magnet 40 is embedded. However, the present invention is not limited to this, and the SPM (permanent magnet exposed on the surface of the rotor) It may be applied to a surface permanent magnet) type rotor, or may be applied to a case where a rotor not including a permanent magnet is cooled by cooling oil supplied from a shaft.

  Further, in the above description, the refrigerant flow path hole 34 constitutes the flux barrier. However, the present invention is not limited to this, and a seal member is provided in the refrigerant flow path hole formed separately from the flux barrier. May be.

  Furthermore, in the above description, a rotor that does not use an end plate has been described. However, end plates may be provided on one or both sides in the axial direction of the rotor core. In this case, the end plate may be provided with a cooling oil discharge port communicating with the coolant flow path hole of the rotor core.

  DESCRIPTION OF SYMBOLS 10 Rotating electrical machine, 12 Stator, 14 Rotor, 16 Stator core, 18 Stator coil, 18a, 18b Coil end part, 20 Rotor core, 20a, 20b Axial end face, 20c Outer peripheral face, 21 Shaft hole, 22 Shaft, 24 Flange part, 26 Fixing member, 28 refrigerant flow path, 30 shaft refrigerant supply path, 32 rotor core refrigerant supply path, 34 refrigerant flow path hole, 38 magnetic pole, 39 caulking portion, 40, 40a, 40b permanent magnet, 46 magnet insertion hole, 48, 49 inner wall surface, 50 magnetic flux passage, 52 seal member, 54 protrusion, 55 pressing part, G gap part.

Claims (7)

A rotor cooling structure for a rotating electrical machine,
A rotatable shaft for supplying coolant flowing inside to the outside;
A coolant passage hole that is externally fitted and fixed to the shaft for flowing a coolant supplied from the shaft in the axial direction of the motor, and a plurality of magnetic plates are laminated in the axial direction of the rotating electrical machine; A rotor core configured,
A seal member is provided on the inner peripheral surface on the outer diameter side of the inner peripheral surface of the refrigerant flow path hole to prevent the coolant from entering between the magnetic plate members.
Cooling structure for rotors for rotating electrical machines. The rotor cooling structure for a rotating electrical machine according to claim 1,
The rotor cooling structure for a rotating electrical machine, wherein the seal member is provided so as to occupy a region on the outer diameter side in the refrigerant flow path hole and closes a gap between the magnetic plate members. The rotor cooling structure for a rotating electrical machine according to claim 1 or 2,
A protrusion is formed on the inner peripheral surface of the refrigerant flow path hole, and the protrusion engages with the seal member and holds the seal member so as not to peel from the inner peripheral surface of the refrigerant flow path hole. Rotor cooling structure. The rotor cooling structure for a rotating electrical machine according to claim 3,
The protrusion comprises two protrusions that protrude from inner wall surfaces on both sides in the circumferential direction of the coolant channel hole, and the two protrusions engage and hold the seal member radially inward to cool the rotor for a rotating electrical machine. Construction. The rotor cooling structure for a rotating electrical machine according to claim 3,
The protrusion is one protrusion that protrudes from the inner peripheral surface of the coolant channel hole on the outer diameter side, and the one protrusion is embedded as an anchor in the seal member so that the seal member is connected to the inner diameter of the outer diameter side. A cooling structure for a rotor for a rotating electrical machine held on a peripheral surface. In the rotor cooling structure for a rotating electrical machine according to any one of claims 1 to 5,
The rotor core cooling structure for a rotating electrical machine, wherein the rotor core includes a magnetic pole in which a permanent magnet is embedded, and the refrigerant flow path hole constitutes a flux barrier that defines a magnetic flux path through which a magnetic flux from the permanent magnet passes. A stator that generates a rotating magnetic field;
A rotating electrical machine comprising: a rotor disposed opposite to the stator via an air gap and having the cooling structure according to any one of claims 1 to 6.

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