JP2019165559A - Magnet cooling structure and rotary electric machine - Google Patents

Abstract

To cool a magnet of a rotor with a simple structure.SOLUTION: A magnet cooling structure according to an embodiment comprises a rotor 4 having a magnet 22 and an end face plate 23 that is provided at an end of the rotor 4 in a shaft direction and has an opening 29. A guide wall 31 for guiding a refrigerant supplied to the opening 29 toward the magnet 22 by utilizing rotation of the rotor 4 is provided with the end face plate 23.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a magnet cooling structure and a rotating electric machine.

  In a rotating electrical machine mounted on a hybrid vehicle, an electric vehicle, or the like, a magnetic field is formed in the stator core by supplying current to the coil, and a magnetic attractive force or a repulsive force is generated between the rotor magnet and the stator core. Thereby, a rotor rotates with respect to a stator.

  In the above-described rotating electrical machine, if heat is generated with driving, there is a risk of performance degradation. Therefore, various configurations for cooling the rotating electrical machine have been studied. For example, in Patent Document 1, a rotor shaft having a refrigerant supply port capable of supplying a refrigerant from the internal refrigerant supply path to the outside of the shaft, and a refrigerant supplied from the refrigerant supply port of the rotor shaft can flow in the axial direction. A structure including a rotor core having a refrigerant channel in an inner peripheral portion is disclosed. In Patent Document 1, the rotor and the stator coil can be cooled by axial cooling.

JP2013-55775A

  However, in order to flow the refrigerant from the refrigerant supply path in the rotor shaft toward the refrigerant flow path in the inner periphery of the rotor core and cool the magnet in the outer periphery of the rotor core, a structure for branching the refrigerant flow is required. Internal structure may be complicated. Therefore, there is room for improvement in cooling the rotor magnet with a simple structure.

  Accordingly, an object of the present invention is to provide a magnet cooling structure and a rotating electrical machine that can cool a rotor magnet with a simple structure.

(1) A magnet cooling structure according to one aspect of the present invention is provided at a rotor (for example, the rotor 4 in the embodiment) having a magnet (for example, the magnet 22 in the embodiment) and an axial end portion of the rotor. An end face plate (for example, the end face plate 23 in the embodiment) having an opening (for example, the openings 29 and 129 in the embodiment), and the end face plate is supplied with the refrigerant supplied to the opening. A guide wall (for example, the guide wall 31 in the embodiment) that guides toward the magnet by using the rotation of the rotor is provided.
(2) In one aspect of the present invention, when viewed from the axial direction of the rotor, the guide wall has a diameter of the rotor toward the downstream side in the rotation direction of the rotor (for example, the rotation direction R1 of the rotor 4 in the embodiment). You may have the slope (for example, slope 31a in embodiment) which inclines so that it may be located inside a direction.
(3) In one aspect of the present invention, the slope may be an arcuate curved surface that protrudes toward the inside in the radial direction.
(4) In one aspect of the present invention, the curved surface may have a smaller curvature toward the downstream side in the rotation direction of the rotor.
(5) In one aspect of the present invention, the opening may include a radially outer opening that opens outward in the radial direction of the rotor (for example, the radially outer opening 29 in the embodiment).
(6) In one aspect of the present invention, the opening may include an axial outer opening that opens outward in the axial direction of the rotor (for example, the axial outer opening 129 in the embodiment).
(7) In one aspect of the present invention, when viewed from the axial direction of the rotor, the guide wall extends linearly from the radially outer end of the rotor toward the radially inner side (for example, The straight portion 31s) in the embodiment and a convex toward the inner side in the radial direction so as to be located on the inner side in the radial direction from the inner end in the radial direction to the downstream side in the rotation direction of the rotor. A curved portion (for example, the curved portion 31r in the embodiment) having an arc shape and having a smaller curvature toward the downstream side in the rotation direction of the rotor may be provided.
(8) A rotating electrical machine according to one aspect of the present invention (for example, the rotating electrical machine 1 in the embodiment) includes a cylindrical stator (for example, the stator 3 in the embodiment) to which a coil (for example, the coil 12 in the embodiment) is mounted. And the above-described magnet cooling structure disposed on the inner side in the radial direction with respect to the stator.

According to the above aspect (1), the end face plate is provided with the guide wall that guides the refrigerant supplied to the opening toward the magnet using the rotation of the rotor, so that the internal structure of the rotor The refrigerant can be guided to the magnet through the guide wall without complicating the (inner structure of the rotor shaft and the rotor core). Therefore, the magnet of the rotor can be cooled with a simple structure.
According to the above aspect (2), the guide wall has an inclined surface that is inclined so that the downstream side in the rotational direction of the rotor is positioned on the inner side in the radial direction of the rotor as viewed from the axial direction of the rotor. Since the refrigerant flows along, the refrigerant can be guided to the magnet more smoothly.
According to the above aspect (3), since the inclined surface is an arcuate curved surface that protrudes inward in the radial direction, the refrigerant is more smoothly guided to the magnet than in the case where the inclined surface is a flat surface. Can do.
According to the above aspect (4), the curvature of the curved surface is smaller toward the downstream side in the rotation direction of the rotor, so that the refrigerant can be more smoothly guided to the magnet than in the case where the curvature of the curved surface is constant. .
According to the above aspect (5), the opening includes the radially outer opening that opens outward in the radial direction of the rotor, so that the magnet is cooled using the refrigerant supplied from the radially outer side of the rotor. can do.
According to the above aspect (6), the opening includes the axially outer opening that opens outward in the axial direction of the rotor, so that the magnet is cooled using the refrigerant supplied from the axially outer side of the rotor. can do.
According to the aspect of the above (7), the guide wall includes a straight portion that extends linearly from the outer end in the radial direction of the rotor toward the inner side in the radial direction when viewed from the axial direction of the rotor. The refrigerant supplied from the outside in the radial direction of the rotor can be smoothly guided toward the inside in the radial direction. In addition, when viewed from the axial direction of the rotor, the guide wall protrudes inward in the radial direction so that the guide wall is located on the inner side in the radial direction from the inner end in the radial direction of the linear portion toward the downstream side in the rotational direction of the rotor By providing the curved portion having an arc shape and a smaller curvature toward the downstream side in the rotation direction of the rotor, the refrigerant supplied from the straight portion can be smoothly guided toward the magnet in the curved portion. Therefore, the magnet of the rotor can be more effectively cooled with a simple structure.
According to the aspect of the above (8), the rotor has a simple structure by including the cylindrical stator on which the coil is mounted and the above-described magnet cooling structure disposed radially inside the stator. It is possible to provide a rotating electrical machine capable of cooling the magnets.

The schematic block diagram of the rotary electric machine which concerns on embodiment. The fragmentary perspective view of the rotary electric machine which concerns on embodiment. The figure which looked at the principal part of the rotation electrical machinery concerning an embodiment from the diameter direction outside. The principal part enlarged view of FIG. Action | operation explanatory drawing of the recessed part which concerns on a comparative example. Action | operation explanatory drawing of the guide wall which concerns on embodiment. The fragmentary perspective view of the rotary electric machine which concerns on the 1st modification of embodiment. The principal part enlarged view of FIG. Action | operation explanatory drawing of the guide wall which concerns on the 2nd modification of embodiment.

  Embodiments of the present invention will be described below with reference to the drawings. In the embodiment, a rotating electric machine (traveling motor) mounted on a vehicle such as a hybrid vehicle or an electric vehicle will be described.

<Rotating electrical machinery>
FIG. 1 is a schematic configuration diagram illustrating an overall configuration of a rotating electrical machine 1 according to the embodiment. FIG. 1 is a diagram including a cross section cut along a virtual plane including an axis C. FIG.
As shown in FIG. 1, the rotating electrical machine 1 includes a case 2, a stator 3, a rotor 4, an output shaft 5, and a refrigerant supply mechanism (not shown).

  The case 2 has a cylindrical box shape that houses the stator 3 and the rotor 4. A refrigerant (not shown) is accommodated in the case 2. A part of the stator 3 is disposed in the case 2 so as to be immersed in the refrigerant. For example, as the refrigerant, ATF (Automatic Transmission Fluid), which is hydraulic oil used for transmission lubrication, power transmission, or the like, is used.

  The output shaft 5 is rotatably supported by the case 2. In FIG. 1, the code | symbol 6 shows the bearing which supports the output shaft 5 rotatably. Hereinafter, the direction along the axis C of the output shaft 5 is referred to as “axial direction”, the direction orthogonal to the axis C is referred to as “radial direction”, and the direction around the axis C is referred to as “circumferential direction”.

The stator 3 includes a stator core 11 and a coil 12 attached to the stator core 11.
The stator core 11 has a cylindrical shape arranged coaxially with the axis C. The stator core 11 is fixed to the inner peripheral surface of the case 2. For example, the stator core 11 is configured by laminating electromagnetic steel plates in the axial direction. The stator core 11 may be a so-called dust core obtained by compression molding metal magnetic powder.

  The coil 12 is attached to the stator core 11. The coil 12 includes a U-phase coil, a V-phase coil, and a W-phase coil that are arranged with a phase difference of 120 ° with respect to the circumferential direction. The coil 12 includes an insertion portion 12 a that is inserted into a slot (not shown) of the stator core 11, and a coil end portion 12 b that protrudes from the stator core 11 in the axial direction. A magnetic field is generated in the stator core 11 when a current flows through the coil 12.

  The rotor 4 is arranged on the inner side in the radial direction with respect to the stator 3 with an interval. The rotor 4 is fixed to the output shaft 5. The rotor 4 is configured to be rotatable integrally with the output shaft 5 around the axis C. The rotor 4 includes a rotor core 21, a magnet 22, and an end face plate 23. In the embodiment, the magnet 22 is a permanent magnet.

  The rotor core 21 has a cylindrical shape arranged coaxially with the axis C. The output shaft 5 is press-fitted and fixed inside the rotor core 21 in the radial direction. The rotor core 21 may be configured by laminating electromagnetic steel plates in the axial direction similarly to the stator core 11 or may be a dust core.

A magnet holding hole 25 penetrating the rotor core 21 in the axial direction is provided on the outer periphery of the rotor core 21. A plurality of magnet holding holes 25 are arranged at intervals in the circumferential direction. A magnet 22 is inserted into each magnet holding hole 25.
A flow path (not shown) (rotor internal flow path) that penetrates the rotor core 21 in the axial direction is formed in the inner peripheral portion of the rotor core 21.

  The end face plates 23 are disposed at both end portions in the axial direction with respect to the rotor core 21. The output shaft 5 is press-fitted and fixed inside the end face plate 23 in the radial direction. The end face plate 23 covers at least the magnet holding hole 25 in the rotor core 21 from both ends in the axial direction. The end face plate 23 is in contact with the outer end face of the rotor core 21 in the axial direction.

  As shown in FIG. 2, the end face plate 23 is provided with a through hole 28 that penetrates the end face plate 23 in the axial direction. The through hole 28 is provided to relieve stress applied to the end face plate 23, reduce the weight of the end face plate 23, and the like. The through hole 28 also functions as a refrigerant discharge hole.

As shown in FIG. 3, the end face plate 23 is provided with an opening portion 29 (hereinafter also referred to as “radially outer opening 29”) that opens outward in the radial direction of the end face plate 23. A plurality of radially outer openings 29 are arranged at intervals in the circumferential direction. The radially outer opening 29 is disposed at a position adjacent to the magnet 22 in the axial direction. Refrigerant such as stator cooling oil (refrigerant dripped from the outside) is supplied to the radially outer opening 29 by a refrigerant supply mechanism (not shown).
In FIG. 2, arrow R <b> 1 indicates the rotation direction of the rotor 4, and arrow Q <b> 1 indicates the inflow direction of the refrigerant supplied to the radially outer opening 29.

<Induction wall>
As shown in FIG. 4, the end face plate 23 is provided with a guide wall 31 that guides the refrigerant supplied to the radially outer opening 29 toward the magnet 22 using the rotation of the rotor 4. In the embodiment, the guide wall 31 is provided on each of the pair of end face plates 23 positioned at both ends of the rotor 4 in the axial direction. In FIG. 4, the arrow R <b> 1 indicates the rotational direction of the rotor 4, and the arrow Q <b> 1 indicates the inflow direction of the refrigerant supplied to the radially outer opening 29.

  When viewed from the axial direction of the rotor 4, the guide wall 31 has an inclined surface 31 a that is inclined so as to be located on the inner side in the radial direction of the rotor 4 toward the downstream side in the rotational direction R <b> 1 of the rotor 4. In other words, the inclined surface 31a is inclined with respect to an imaginary plane including the axis C and a line orthogonal to the axis C so that the downstream side in the rotation direction R1 of the rotor 4 is located on the inner side in the radial direction of the rotor 4.

  The slope 31a is an arcuate curved surface that protrudes inward in the radial direction. The curvature of the curved surface is smaller toward the downstream side in the rotation direction R1 of the rotor 4.

Specifically, the guide wall 31 according to the embodiment includes a straight part 31 s and a curved part 31 r connected to the straight part 31 s when viewed from the axial direction of the rotor 4.
When viewed from the axial direction of the rotor 4, the linear portion 31 s extends linearly from the radially outer end of the rotor 4 toward the radially inner side.
When viewed from the axial direction of the rotor 4, the curved portion 31r is directed radially inward so as to be located radially inward from the radially inner end of the linear portion 31s toward the downstream side in the rotational direction R1 of the rotor 4. It has a convex arc shape. The curved portion 31r has a smaller curvature toward the downstream side in the rotation direction R1 of the rotor 4.

  The end face plate 23 is provided with a spiral groove 30 (hereinafter also referred to as “spiral groove 30”) communicating with the radially outer opening 29. When viewed from the axial direction of the rotor 4, the spiral groove 30 has a sharp shape that is recessed inward in the radial direction so as to be tapered toward the downstream side in the rotation direction R <b> 1 of the rotor 4. The tip (sharp part) of the spiral groove 30 opens toward the magnet 22.

  The end face plate 23 is provided with a second wall 32 for retaining the refrigerant supplied to the spiral groove 30 in the spiral groove 30 by using the rotation of the rotor 4. When viewed from the axial direction of the rotor 4, the second wall has an arc shape that protrudes inward in the radial direction so that the downstream side in the rotational direction R <b> 1 of the rotor 4 is positioned inward in the radial direction. The second wall 32 defines the spiral groove 30 together with the guide wall 31.

<Action>
Hereinafter, the operation of the guide wall 31 of the embodiment will be described.
First, a comparative example will be described with reference to FIG.
As shown in FIG. 5, the end face plate 23X according to the comparative example is provided with a U-shaped recess 30X that is recessed inward in the radial direction. The recess 30X includes a first flat wall 31X, a second flat wall 32X that faces the first flat wall 31X in the rotational direction R1 of the rotor 4, a radial inner end of the first flat wall 31X, and the second flat wall 32X. A third planar wall 33X connecting the inner ends in the radial direction. In FIG. 5, an arrow R <b> 2 indicates a tangential component in the rotation direction R <b> 1 of the rotor 4.

In the comparative example, when the refrigerant collides with the first flat wall 31X of the recess 30X due to the rotation of the rotor 4, there is a high possibility that an excessive impact force is generated and the refrigerant is bounced out of the recess 30X. In FIG. 5, an arrow Q1 indicates a supply direction of a refrigerant such as stator cooling oil, and an arrow Q2 indicates a direction in which the refrigerant is rebounded by an impact force.
In addition, in the comparative example, even if the refrigerant enters the recess due to the centrifugal force accompanying the rotation of the rotor 4, there is a high possibility that the coolant will be pushed out of the recess.
Therefore, in the comparative example, even if the recess 30X is opened toward the magnet (not shown), the refrigerant hardly reaches the magnet.

Next, an embodiment will be described with reference to FIG.
In the embodiment, since the inclined surface 31a of the guide wall 31 is an arcuate curved surface that protrudes inward in the radial direction, even if the refrigerant collides with the curved surface due to the rotation of the rotor 4, an excessive impact force is generated. Therefore, it is unlikely that the refrigerant will be bounced out of the spiral groove 30.
In addition, in the embodiment, since the refrigerant flows along the curved surface by the rotation of the rotor 4, the possibility that the refrigerant is pushed out of the spiral groove 30 by the centrifugal force accompanying the rotation of the rotor 4 is low. In FIG. 6, an arrow Q3 indicates the flow direction of the refrigerant along the curved surface.

  Specifically, in the embodiment, the guide wall 31 includes a linear portion 31 s (see FIG. 4, a plane along the radial direction) that extends linearly from the radial outer end of the rotor 4 toward the radial inner side. Thus, the refrigerant can enter the spiral groove 30 along the straight portion 31s. That is, in the embodiment, since the portion where the refrigerant first enters the spiral groove 30 is the linear portion 31 s along the radial direction, there is no portion that blocks the refrigerant, and the refrigerant smoothly enters the spiral groove 30. be able to.

  In addition, in the embodiment, the guide wall 31 is convex toward the inner side in the radial direction so that the guide wall 31 is located on the inner side in the radial direction from the inner end in the radial direction of the linear portion 31s toward the downstream side in the rotation direction R1 of the rotor 4. By providing the curved portion 31r (see FIG. 4, curved surface) having an arcuate shape, the refrigerant that has entered the spiral groove 30 via the straight portion 31s is instantaneously passed from the upstream side in the rotational direction R1 of the rotor 4 by the curved portion 31r. Since it can cover, it can suppress that a refrigerant | coolant is pushed out of the spiral groove 30 with the centrifugal force accompanying rotation of the rotor 4. FIG.

In addition, in the embodiment, the curved portion 31r has a smaller curvature toward the downstream side in the rotation direction R1 of the rotor 4, so that the refrigerant covered by the curved portion 31 r due to the rotation of the rotor 4 opens toward the magnet 22. It can flow smoothly along the curved portion 31r toward the tip of the spiral groove 30 (see FIG. 4).
Therefore, in the embodiment, the refrigerant easily reaches the magnet 22 as compared with the comparative example. The refrigerant that has flowed toward the magnet 22 flows on the surface of the end face plate 23 through the above-described through hole 28 (discharge hole). In FIG. 4, an arrow Q <b> 4 indicates the discharge direction of the refrigerant that has flowed toward the magnet 22.

As described above, the magnet cooling structure of the above embodiment includes the rotor 4 having the magnet 22 and the end face plate 23 provided at the end portion in the axial direction of the rotor 4 and having the opening 29, and the end face plate. 23 is provided with a guide wall 31 that guides the refrigerant supplied to the opening 29 toward the magnet 22 using the rotation of the rotor 4.
According to this configuration, the end face plate 23 is provided with the guide wall 31 that guides the refrigerant supplied to the opening 29 toward the magnet 22 using the rotation of the rotor 4. The refrigerant can be guided to the magnet through the guide wall 31 without complicating the internal structure (the internal structure of the output shaft 5 and the rotor core 21). Therefore, the magnet 22 of the rotor 4 can be cooled with a simple structure.

  In the above embodiment, the guide wall 31 has the inclined surface 31a that is inclined so as to be located on the inner side in the radial direction of the rotor 4 toward the downstream side in the rotation direction R1 of the rotor 4 when viewed from the axial direction of the rotor 4. Since the refrigerant flows along the slope 31a, the refrigerant can be guided to the magnet 22 more smoothly.

  In the above embodiment, since the inclined surface 31a is an arcuate curved surface that protrudes inward in the radial direction, the refrigerant can be guided to the magnet 22 more smoothly than in the case where the inclined surface 31a is a flat surface. .

  In the embodiment described above, the curved surface has a smaller curvature toward the downstream side in the rotation direction R <b> 1 of the rotor 4, so that the refrigerant can be guided to the magnet 22 more smoothly than in the case where the curvature of the curved surface is constant.

  In the embodiment described above, the opening 29 includes the radially outer opening 29 that opens radially outward of the rotor 4, thereby cooling the magnet 22 using the refrigerant supplied from the radially outer side of the rotor 4. be able to.

  In the said embodiment, seeing from the axial direction of the rotor 4, the guide wall 31 is provided with the linear part 31s extended linearly toward the inner side of radial direction from the radial direction outer end of the rotor 4, In linear part 31s The refrigerant supplied from the radially outer side of the rotor 4 can be smoothly guided toward the radially inner side. In addition, when viewed from the axial direction of the rotor 4, the guide wall 31 is radially inward so that the guide wall 31 is located radially inward from the radially inner end of the linear portion 31 s toward the downstream side in the rotational direction R <b> 1 of the rotor 4. In the curved portion 31r, the refrigerant supplied from the linear portion 31s is directed to the magnet 22 by providing the curved portion 31r having a convex shape toward the center and having a smaller curvature toward the downstream side in the rotational direction R1 of the rotor 4. Can be guided smoothly. Therefore, the magnet 22 of the rotor 4 can be cooled more effectively with a simple structure.

  The rotating electrical machine 1 according to the above embodiment includes a cylindrical stator 3 on which a coil 12 is mounted, and the above-described magnet cooling structure disposed on the inner side in the radial direction with respect to the stator 3. Thus, the rotating electrical machine 1 that can cool the magnet of the rotor 4 can be provided.

  Hereinafter, modifications of the embodiment will be described. In each modified example, the same components as those in the embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

(First modification)
In the above-described embodiment, the configuration in which the opening portion includes the radial outer opening 29 that opens to the outer side in the radial direction of the rotor 4 has been described. For example, as shown in FIG. 7, the opening may include an axial outer opening 129 that opens outward in the axial direction of the rotor 4. As shown in FIG. 8, the axially outer opening 129 communicates with a portion of the spiral groove 30 opposite to the tip portion.

  In this modification, the opening includes an axially outer opening 129 that opens outward in the axial direction of the rotor 4, so that the magnet 22 is cooled using the refrigerant supplied from the axially outer side of the rotor 4. be able to.

  Note that the opening may include both the radially outer opening 29 and the axially outer opening 129. Thereby, the magnet 22 can be cooled using the refrigerant supplied from the outer side in the radial direction of the rotor 4 and the refrigerant supplied from the outer side in the axial direction of the rotor 4.

(Second modification)
In the above-described embodiment, the configuration in which the inclined surface 31a is an arcuate curved surface that protrudes inward in the radial direction has been described, but the configuration is not limited thereto. For example, as shown in FIG. 9, the inclined surface 231a may be a flat surface. When viewed from the axial direction of the rotor 4, the inclined surface 231 a of this modification is inclined linearly so that the downstream side in the rotation direction R <b> 1 of the rotor 4 is located on the inner side in the radial direction of the rotor 4.

  In the above-described embodiment, the end face plate 23 has been described with the configuration in which the spiral groove 30 communicating with the opening is provided, but the present invention is not limited thereto. For example, as shown in FIG. 9, the end face plate 23 may be provided with a V-shaped groove 230 (hereinafter also referred to as “V-shaped groove 230”) communicating with the opening. The tip (sharp part) of the V-shaped groove 230 opens toward a magnet (not shown).

In the present modification, the inclined surface 231a is a flat surface that is inclined linearly so that the downstream side of the rotation direction R1 of the rotor 4 is located on the inner side of the rotor 4 in the radial direction. Even if it collides, an excessive impact force is not generated, and the possibility that the refrigerant is bounced out of the V-shaped groove 230 is low.
In addition, in this modification, since the refrigerant flows along the inclined plane due to the rotation of the rotor 4, the possibility of the refrigerant being pushed out of the V-shaped groove 230 by the centrifugal force accompanying the rotation of the rotor 4 is low. In FIG. 9, an arrow Q5 indicates the flow direction of the refrigerant along the inclined plane.

(Other variations)
In the above-described embodiment, the rotating electrical machine 1 has been described by taking an example of a traveling motor mounted on a vehicle such as a hybrid vehicle or an electric vehicle. However, the present invention is not limited to this. For example, the rotating electrical machine 1 may be a motor for power generation, a motor for other uses, or a rotating electrical machine other than for a vehicle (including a generator).

  In the embodiment described above, the example in which the coolant is supplied to the magnet 22 along the guide wall 31 provided on the end face plate 23 by the rotation of the rotor 4 has been described, but the present invention is not limited thereto. For example, the shaft center cooling may be further performed using a shaft flow path provided in the output shaft 5. For example, the coolant may be supplied to the opening of the end face plate 23 through a supply port provided in the case 2 or the like.

  In the above-described embodiment, the guide wall 31 has been described as an example provided on each of the pair of end face plates 23 positioned at both ends of the rotor 4 in the axial direction, but the present invention is not limited thereto. For example, the guide wall 31 may be provided only on one end face plate 23 located at one end of the rotor 4 in the axial direction.

  In the above-described embodiment, the curved portion (curved surface) in the guide wall 31 has been described with an example in which the curvature is smaller toward the downstream side in the rotation direction R <b> 1 of the rotor 4. For example, the curved portion (curved surface) in the guide wall 31 may have a larger curvature toward the downstream side in the rotation direction R <b> 1 of the rotor 4.

  Although the preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and additions, omissions, substitutions, and other modifications of the configuration can be made without departing from the spirit of the present invention. It is also possible to combine the above-described modified examples as appropriate.

DESCRIPTION OF SYMBOLS 1 ... Rotating electrical machine 3 ... Stator 4 ... Rotor 12 ... Coil 22 ... Magnet 23 ... End face plate 29 ... Radial direction outer side opening (opening part)
31 ... guide wall 31a ... slope (curved surface)
31s ... straight line part 31r ... curved part 129 ... axial direction outside opening (opening part)
231a ... Slope C ... Axis R1 ... Rotation direction of rotor

Claims (8)

A rotor having magnets;
An end face plate provided at an axial end of the rotor and having an opening,
The magnet cooling structure, wherein the end face plate is provided with a guide wall that guides the refrigerant supplied to the opening toward the magnet by using rotation of the rotor.   2. The guide wall according to claim 1, wherein when viewed from the axial direction of the rotor, the guide wall has an inclined surface that is inclined so as to be positioned on the inner side in the radial direction of the rotor toward the downstream side in the rotational direction of the rotor. Magnet cooling structure.   The magnet cooling structure according to claim 2, wherein the inclined surface is an arcuate curved surface projecting inward in the radial direction.   The magnet cooling structure according to claim 3, wherein the curved surface has a smaller curvature toward the downstream side in the rotation direction of the rotor.   The magnet cooling structure according to any one of claims 1 to 4, wherein the opening includes a radially outer opening that opens to a radially outer side of the rotor.   The magnet cooling structure according to any one of claims 1 to 5, wherein the opening includes an axial outer opening that opens outward in the axial direction of the rotor. When viewed from the axial direction of the rotor, the guide wall is
A linear portion extending linearly from the radially outer end of the rotor toward the radially inner side;
The linear portion has an arc shape that protrudes inward in the radial direction so as to be located on the inner side in the radial direction from the inner end in the radial direction to the downstream side in the rotation direction of the rotor, and the rotation of the rotor The magnet cooling structure according to any one of claims 1 to 6, further comprising a curved portion having a smaller curvature toward the downstream side in the direction. A cylindrical stator fitted with a coil;
A rotating electrical machine comprising: the magnet cooling structure according to any one of claims 1 to 7 disposed radially inside the stator.

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