WO2023136117A1

WO2023136117A1 - Rotary electric machine

Info

Publication number: WO2023136117A1
Application number: PCT/JP2022/047952
Authority: WO
Inventors: 健二福井; 隆之鬼橋
Original assignee: 三菱電機株式会社
Priority date: 2022-01-11
Filing date: 2022-12-26
Publication date: 2023-07-20

Abstract

A rotary electric machine (100) comprises a rotor (10) which is provided with a centrifugal fan (15) that rotates coaxially with a shaft (11), a stator (20) which is provided with a stator core (21) and a coil (22) that is wound around the stator core (21), and a housing (3) inside which the stator (20) is fixed, wherein: the housing (3) is provided with an intake port (31IN) further outward in the axial direction (Z) than another end plate (14) which has no centrifugal fan (15); the housing (3) is provided with a discharge port (31OUT) opposite from the centrifugal fan (15) in the radial direction (X); the centrifugal fan (15) is provided with a shroud (15A) on the inward side in the axial direction (Z); and the inner diameter of the shroud (15A) is greater than the outer diameter of the rotor (10).

Description

Rotating electric machine

This application relates to rotating electric machines.

　In order to reduce material costs by miniaturizing rotating electric machines, there is a need to further increase the output density per mass of rotating electric machines. In addition, the rotary electric machine itself has come to be used in moving bodies, and further improvement in efficiency is required. One of the issues for increasing the power density is the heat generated by the rotary electric machine. Regarding the cooling of a rotating electrical machine, the water-cooled type increases the mass and size of the rotating electrical machine, limiting its application range. Therefore, air cooling is often used. As an air-cooled rotating electrical machine, for example, the rotating electrical machine disclosed in Patent Document 1 has been proposed as an air-cooled rotating electrical machine in which a fan circulates air or another fluid through a fluid circuit to cool the rotor when the rotor rotates with respect to the stator. It is

Japanese Patent Publication No. 2021-503268

However, in order to further improve the efficiency of rotating electric machines, it is necessary to further increase the cooling capacity.

The present application discloses a technique for solving the above problems, and aims to provide a highly efficient rotating electric machine with high cooling capacity.

The rotating electric machine disclosed in the present application is
a shaft; a rotor core fixed to the shaft; magnets extending in the axial direction of the rotor core and provided at equal intervals in the circumferential direction; and a centrifugal fan provided outside one of the end plates in the axial direction and rotating coaxially with the shaft;
A rotating electric machine comprising a stator having a stator core, a coil wound around the stator core, and a housing in which the stator is fixed,
the housing has a suction port axially outside the other end plate without the centrifugal fan for introducing refrigerant into the housing from the outside;
the housing includes an outlet that faces the centrifugal fan in a radial direction and that discharges the refrigerant to the outside of the housing;
The centrifugal fan has a shroud on the inner side in the axial direction,
The inner diameter of the shroud is larger than the outer diameter of the rotor.

According to the rotating electrical machine disclosed in the present application, a rotating electrical machine with high cooling capacity and high efficiency can be provided.

1 is a cross-sectional view showing the configuration of a rotating electric machine according to Embodiment 1; FIG. 2 is a plan view of the rotor according to Embodiment 1 as seen from the axial direction; FIG. 1 is a perspective view showing the configuration of a centrifugal fan according to Embodiment 1; FIG. 1 is a perspective view showing the configuration of a shrouded centrifugal fan according to Embodiment 1. FIG. FIG. 7 is a cross-sectional view showing the configuration of a rotating electric machine according to Embodiment 2; FIG. 11 is a cross-sectional view showing the configuration of a rotating electric machine according to Embodiment 3; FIG. 11 is a perspective view showing the configuration of an end plate according to Embodiment 4; FIG. 11 is a plan view of a rotor according to Embodiment 5 as seen from the axial direction; FIG. 12 is a cross-sectional view showing the configuration of a rotating electric machine according to Embodiment 6; FIG. 12 is a cross-sectional view showing the configuration of a rotating electric machine according to Embodiment 7; FIG. 14 is a cross-sectional view showing the configuration of a rotating electric machine according to an eighth embodiment; FIG. 12 is a cross-sectional view showing the configuration of a rotating electrical machine according to Embodiment 4; FIG. 20 is a cross-sectional view of a main part showing the configuration of a rotating electrical machine according to Embodiment 9;

Embodiment 1.
In this specification, unless otherwise specified, "axial direction", "circumferential direction", "radial direction", "inner peripheral side", "outer peripheral side", "inner peripheral surface", and "outer peripheral surface" are used respectively. , "axial direction", "circumferential direction", "radial direction", "inner peripheral side", "outer peripheral side", "inner peripheral surface" and "outer peripheral surface" of the stator or rotor referred to. In addition, when referring to the shaft as “outside in the axial direction” and “inside in the axial direction”, the side including the center point of the shaft is “inner”, and the opposite is “outside”.

FIG. 1 is a cross-sectional view showing the configuration of a rotating electrical machine 100 according to Embodiment 1. As shown in FIG.
2 is a plan view of the rotor 10 viewed from the axial direction Z. FIG.
The rotary electric machine 100 includes a stator 20 , a rotor 10 rotatably supported with its outer peripheral surface opposed to the inner peripheral surface of the stator 20 with a gap 4 interposed therebetween, and a housing 3 .

The rotor 10 is composed of a shaft 11 , a rotor core 12 , magnets 13 , end plates 14 and a centrifugal fan 15 .

A rotor core 12 in which electromagnetic steel plates are laminated in the axial direction Z is fixed to the shaft 11 . At both ends of the rotor core 12 in the axial direction Z, there are ends for fixing the rotor core 12 , fixing the magnets 13 , and adjusting the balance of the rotor 10 . A plate 14 is provided.

Furthermore, a bearing 16 is provided outside each end plate 14 in the axial direction Z. A centrifugal fan 15 is provided between one end plate 14 and the bearing 16 , and the centrifugal fan 15 is arranged on a plane perpendicular to the axial direction Z of the shaft 11 . Centrifugal fan 15 rotates coaxially with shaft 11 . A non-rotating portion of the bearing 16 (outer ring of the bearing 16 in FIG. 1) is fixed to the housing 3 . It should be noted that the rotor core 12 may be a dust core instead of the laminated electromagnetic steel sheets.

As shown in FIG. 1, let the outer diameter of the rotor 10 be Rrc. The rotary electric machine 100 is an IPM rotary electric machine (IPM: Interior Permanent Magnet).

Although FIG. 2 shows the rotor 10 with four poles, it may have any number of poles, such as six poles and eight poles. On both sides of the magnet 13 in the circumferential direction Y, flux barriers 17 (cavities penetrating in the axial direction Z) are provided to prevent short-circuiting of the flux.

3 is a perspective view showing the configuration of the centrifugal fan 15. FIG. Although the number of blades 15W is six in FIG. 3, the number of blades 15W does not have to be six, and the number of blades 15W may be changed according to the required cooling capacity and rotational speed.

In FIG. 3, the blades 15W are blades that radially extend outward in the radial direction X from the shaft 15S, but are not limited to being radial, and may be blades that draw an involute curve, for example. As shown in FIG. 3, the outer diameter of the centrifugal fan 15 is Rfo, and the outer diameter of the shaft 15S, which is the root portion of the blades 15W, is Rfs.

FIG. 4 is a perspective view showing the configuration of the centrifugal fan 15 with a shroud. The shroud 15A is attached inside the centrifugal fan 15 in the axial direction Z. As shown in FIG. Moreover, the shroud 15A has a hollow disk shape facing the coil 22 in the axial direction Z. As shown in FIG. The shroud 15A restricts the flow path of the coolant flowing into the centrifugal fan 15 from the axial direction Z, and restricts blowback of the coolant. The outer diameter of the shroud 15A is Rfo, which is the same as the outer diameter of the centrifugal fan 15 . As shown in FIG. 4, the inner diameter of the shroud 15A is Rfsi.

The coolant (air) flowing from the gap 4 between the outer peripheral surface of the rotor 10 and the inner peripheral surface of the stator 20 generates eddies due to changes in the cross-sectional area of the flow path. However, by making the inner diameter Rfsi of the shroud 15A larger than the outer diameter Rrc of the rotor 10 shown in FIG. It becomes a wall and can suppress blowback to the upstream side. In addition, the coolant can be efficiently flowed to the outside of the rotating electrical machine 100 without reducing the cross-sectional area of the flow path (without generating pressure loss), and the cooling efficiency of the rotating electrical machine 100 can be improved.

As shown in FIG. 1, the stator 20 is composed of a stator core 21 and a coil 22 wound around the stator core 21. The stator core 21 is configured by laminating electromagnetic steel sheets in the axial direction Z, and adjacent laminations are fixed in the axial direction Z by caulking, adhesion, welding, or the like. A stator core 21 of the stator 20 is fixed inside the housing 3 . The stator core 21 has an annular core-back portion and a plurality of teeth protruding inward in the radial direction X from the core-back portion.

One end of the coil end portion 22e of the coil 22 wound around the stator core 21 is arranged at a position facing the centrifugal fan 15 of the rotor 10 in the axial direction Z when assembled as the rotating electric machine 100. The housing 3 has an outlet 31OUT on the side with the centrifugal fan 15 and an inlet 31OUT on the side without the centrifugal fan 15 (opposite side in the axial direction Z) in order to secure the flow path of the refrigerant from the outside. 31 IN is provided. In FIG. 1, the suction port 31IN is provided outside the end plate 14 in the axial direction Z so as to open in the radial direction X. It may be provided to One end of the discharge port 31OUT on the stator core side in the axial direction Z is closer to the stator core 21 than the shroud 15A in the axial direction Z. As shown in FIG.

According to the rotating electrical machine 100 according to the first embodiment, when the rotor 10 rotates, the centrifugal fan 15 of the rotor 10 creates a negative pressure inside the rotating electrical machine 100, and the coolant flows through the flow path indicated by the arrow P in FIG. flowing. That is, the refrigerant flows in the axial direction Z from the inlet 31IN side toward the outlet 31OUT.

Specifically, the refrigerant flows into the housing 3 from the inlet 31IN at one end in the axial direction Z of the housing 3, flows through the gap 4 between the rotor 10 and the stator 20, passes through the centrifugal fan 15, and flows through the centrifugal fan 15. is discharged to the outside of the housing 3 from the discharge port 31OUT facing in the radial direction X. Rotating electric machine 100 can be cooled by the flow of this coolant.

Further, by making the inner diameter Rfsi of the shroud larger than the outer diameter Rrc of the rotor, the shroud 15A acts as a wall for the vortex of the refrigerant flowing into the centrifugal fan 15 from the inside of the shroud 15A in the radial direction X, and the refrigerant flows. Blowback to the upstream side can be suppressed. Moreover, the coolant can be efficiently discharged to the outside of the rotating electric machine 100 without reducing the cross-sectional area of the flow path (without generating pressure loss), and the cooling efficiency of the rotating electric machine 100 can be improved.

Embodiment 2.
A rotating electric machine according to Embodiment 2 will be described below with reference to the drawings.
FIG. 5 is a cross-sectional view showing the configuration of rotating electric machine 200 according to the second embodiment.
The difference in configuration between rotating electrical machine 100 of the first embodiment and rotating electrical machine 200 of the second embodiment is the support configuration of rotor 210 . Rotating electric machine 200 is composed of rotor 210 , stator 20 and housing 3 .

The rotor 210 is composed of a shaft 211 , rotor core 12 , magnets 13 , end plates 14 and centrifugal fan 15 .

A rotor core 12 formed by stacking electromagnetic steel sheets in the axial direction Z is fixed to the shaft 11. End plates 14 are provided at both ends of the rotor core 12 in the axial direction for fixing the rotor core 12, fixing the magnets 13, and adjusting the balance. ing.

Furthermore, a bearing 16 is provided on the outer side of the one end plate 14 in the axial direction Z. A centrifugal fan 15 is provided between the end plate 14 and the bearing 16 (outside the end plate 14 in the axial direction Z), and the centrifugal fan 15 is arranged on a plane perpendicular to the axial direction Z of the shaft 211. ing. Centrifugal fan 15 rotates coaxially with shaft 11 . A non-rotating portion of the bearing 16 (the outer ring of the bearing 16 in FIG. 5) is fixed to the housing 203 . It should be noted that the rotor core 12 may be a dust core instead of the laminated electromagnetic steel sheets.

A cross section perpendicular to the axial direction Z of the rotor 210 is the same as in FIG. 2 of the first embodiment.
As shown in FIG. 5, the outer diameter of the rotor 10 is Rrc. In the second embodiment, the rotor core 12 extends in the axial direction Z and is provided with four slots S provided at regular intervals in the circumferential direction Y, and the magnets 13 are inserted in the axial direction Z in the IPM electric rotating machine ( IPM: Interior Permanent Magnet).

Although the rotor 10 with four poles is used in this embodiment as well, it may have any number of poles, such as six poles and eight poles. On both sides of the magnet 13 in the circumferential direction Y, flux barriers 17 for preventing short-circuiting of the flux are provided in the axial direction.

The configurations of the centrifugal fan 15 and the stator 20 are also the same as those of the first embodiment, so they are omitted.

The housing 203 is composed of a housing body 32 and a bracket 33. The housing body 32 is provided with a discharge port 31OUT on the side with the centrifugal fan 15 and an intake port 231IN on the side without the centrifugal fan 15 (opposite side in the axial direction Z) in order to secure a coolant flow path. In FIG. 5, the discharge port 31OUT is provided so as to open in the axial direction Z, but it may be provided so as to open in the radial direction X at the end of the housing body 32 on the side where the centrifugal fan 15 is not provided. . Also, although the rotating portion of the rotor 210 is exposed, the bracket 33 may be omitted.

According to the rotating electric machine 200 according to the second embodiment, when the rotor 210 rotates, the centrifugal fan 15 of the rotor 210 creates a negative pressure inside the rotating electric machine 200, and the refrigerant flows through the flow path indicated by the arrow P in FIG. flowing. That is, the refrigerant flows in the axial direction Z from the inlet 231IN side toward the outlet 31OUT.

Specifically, the refrigerant flows into the housing 203 from the suction port 231IN of the bracket 33 provided at one end of the housing 203 in the axial direction Z, flows through the gap 4 between the rotor 210 and the stator 20, and flows through the centrifugal fan 15. It is discharged to the outside of the housing 203 from an outlet 31OUT facing the centrifugal fan 15 in the radial direction X. Rotating electric machine 200 can be cooled by the flow of this coolant.

Further, as in the first embodiment, by making the inner diameter Rfsi of the shroud 15A larger than the outer diameter Rrc of the rotor, the vortex of the refrigerant flowing into the centrifugal fan 15 from the inner side of the shroud 15A in the radial direction X is The shroud 15A serves as a wall and can suppress the blowback of the refrigerant to the upstream side. In addition, the coolant can be efficiently flowed to the outside of the rotating electrical machine 100 without reducing the cross-sectional area of the flow path (without generating pressure loss), and the cooling efficiency of the rotating electrical machine 100 can be improved.

Also, since the bearing 16 is on one side compared to the first embodiment, the rotating electric machine 200 can be easily assembled.

Embodiment 3.
Hereinafter, the rotating electric machine according to the third embodiment will be described with reference to drawings, focusing on the parts that differ from the first and second embodiments.
FIG. 6 is a cross-sectional view showing the configuration of rotating electric machine 300 according to the third embodiment.
The difference in configuration between the rotating electrical machine 200 of the second embodiment and the rotating electrical machine 300 of the third embodiment is the configuration of the rotor.
In the rotor 210 of the second embodiment, the centrifugal fan 15 is arranged between the cantilevered rotor 210 and the bearing 16, but in the third embodiment, the shaft 311 of the rotor 310 is supported by the bearing 16. A centrifugal fan 15 is provided at the end on the non-open side. Accordingly, the positions of the inlet 331IN and the outlet 331OUT are also opposite in the axial direction Z from the rotary electric machine 200 of the second embodiment.

The rotary electric machine 300 according to the third embodiment has the same effects as the first and second embodiments. Moreover, since the bearing 16 is provided only on one side as compared with the first embodiment, the assembly of the rotary electric machine 300 is facilitated.

Furthermore, if the diameters of the rotor core 12 and the end plate 14 of the rotor 310 are equal to or greater than the diameter of the bearings 16, the rotor 10 with the bearings 16 fixed thereto is inserted into the stator 20 after the stator 20 is fixed to the housing body 32. Since the rotary electric machine 300 can be assembled with the rotary electric machine 300, the ease of assembly of the rotary electric machine 300 can be improved.

Embodiment 4.
A rotating electrical machine according to Embodiment 4 will be described below with reference to the drawings.
The rotating electrical machine according to the present embodiment differs from the rotating electrical machines 100 to 300 of the first to third embodiments in the configuration of the end plate used for the rotor.
FIG. 12 is a cross-sectional view showing the configuration of rotating electric machine 400 according to the fourth embodiment.
FIG. 7 is a perspective view of end plate 414 . The lower side of the paper surface of FIG. 7 is the rotor core 12 side.
Four notches 414k are provided in the lower surface of the end plate 414 at equal intervals in the circumferential direction in the axial direction Z, and these notches 414k communicate with the flux barriers 17 adjacent in the circumferential direction. , are provided so as to open in the radial direction X.

According to the rotary electric machine according to the fourth embodiment, when the rotor rotates, negative pressure is formed by the centrifugal fan 15, and the refrigerant flows in the axial direction Z from the side where the centrifugal fan 15 is not arranged to the side where the centrifugal fan 15 is arranged. In addition to the gap 4 between the rotor and the stator, the flux barrier 17 provided on the rotor 10 can also be used as a coolant flow path through the notch 414k. Thereby, the cooling performance of the rotor 10 can be further improved. Since the cutouts 414k do not penetrate in the axial direction, the coolant that has flowed through the flux barrier 17 flows toward the coil end portions 22e of the coils 22 located outside in the radial direction X of the rotor 10, and the coolant flows to the coil end portions 22e. Can improve flow rate. In order to improve the flow rate of the coolant to the coil end portion 22e, the notch 414k is positioned on the rotor 10 side (the stator core side) of the shroud 15A in the axial direction.

Embodiment 5.
A rotating electrical machine according to Embodiment 5 will be described below with reference to the drawings.
The rotating electrical machine according to the present embodiment differs from the rotating electrical machines 100 to 300 of the first to third embodiments in the configuration of the end plate used for the rotor.
8 is a plan view of the rotor 510 viewed from the axial direction Z. FIG.
As shown in FIG. 8 , the end plate 514 has a shape that does not block the flux barrier 17 of the rotor core 12 of the rotor 510 . The outer diameter L1 of the end plate 514 is made smaller than the length L2 between the two flux barriers 17 arranged point-symmetrically about the center O of the shaft 11 in FIG. In addition, the outer diameter L1 of the end plate 514 is made larger than the length W1 between the two magnets 13 arranged symmetrically about the center O of the shaft 11 . At this time, the end plate 514 covers at least part of the end surface of the magnet 13 in the axial direction Z, but does not cover the axial opening 17OUT of the flux barrier 17 . As a result, the flux barrier 17 can be secured as a coolant flow path without interfering with the magnet fixing function of the end plate 514 .

According to the rotary electric machine according to Embodiment 5, the rotor 10 rotates, a negative pressure is generated by the centrifugal fan 15, and the refrigerant flows in the axial direction Z from the side where the centrifugal fan 15 is not arranged to the side where it is arranged. In addition to the gap 4 between the rotor and stator, the flux barrier 17 provided on the rotor 10 can also be used as a flow path. Thereby, the cooling performance of the rotor 10 can be improved.

Further, the electromagnetic steel plates of the rotor core 12 and the magnets 13 that constitute the rotor 510 can be fixed in the axial direction Z while providing the flow path described above. Moreover, compared with the end plate 414 described in the fourth embodiment, the end plate 514 can be easily processed, and the manufacturing cost of the product can be reduced. The shape of the end plate 514 is not limited to a cylindrical shape, and may be a hollow polygonal prism or a star-shaped extruded shape.

Embodiment 6.
A rotating electrical machine according to Embodiment 6 will be described below with reference to the drawings.
FIG. 9 is a cross-sectional view showing the configuration of rotating electric machine 600 according to the sixth embodiment.
The rotating electric machine according to the present embodiment differs from the rotating electric machines according to the first to fifth embodiments in the configuration of the end plate used for rotor 610 .
In Embodiment 6, an end plate 614 having a tapered portion 614T whose outer diameter gradually decreases outward in the axial direction Z is used on the outer peripheral surface. Although FIG. 9 shows an example in which the end plate 614 is used as the end plate on the side where the centrifugal fan 15 is attached, it may be attached on both sides. Also, the radius of the end plate 614 having the tapered portion 614T on the side of the centrifugal fan 15 may be smaller than the outer diameter of the shaft 15S of the centrifugal fan 15 . If both are the same, the outer peripheral surface of one axially outer end of the tapered portion 614T of the end plate is preferably connected to the outer peripheral surface of the root portion of the blade 15W of the centrifugal fan 15, as shown in FIG.

According to the rotary electric machine 600 according to Embodiment 6, the space between the end plate 614 and the coil end portion 22e of the stator 20 is widened, and the refrigerant flowing out from the gap 4 can be smoothly introduced into the centrifugal fan 15. This can reduce the pressure loss.

Also, since the outer diameter of the shaft 15S of the centrifugal fan 15 can be made smaller than the outer diameter of the rotor core 12, the blades 15W, which are in a trade-off relationship, can be made larger in the radial direction X than in the first to fifth embodiments. As a result, the blades 15W of the centrifugal fan 15 can be used effectively. Therefore, the flow rate of the coolant flowing in the axial direction Z inside the rotary electric machine 600 is increased, and the cooling performance of the rotary electric machine 600 can be improved.

Embodiment 7.
A rotating electrical machine according to Embodiment 7 will be described below with reference to the drawings.
The rotating electric machine according to the present embodiment differs from the rotating electric machines according to the first to sixth embodiments in the configuration of the centrifugal fan and the end plate.
FIG. 10 is a cross-sectional view showing the configuration of rotating electric machine 700 according to the seventh embodiment.
As shown in FIG. 10, in this embodiment, shaft 715S of centrifugal fan 715 functions as an end plate.

According to the rotary electric machine 700 according to the seventh embodiment, a single part can perform the functions of the end plates 14 to 614 and the centrifugal fan 15 described above, and the number of parts of the rotary electric machine 700 can be reduced. can.

If the end plate and the centrifugal fan are separate parts, the balance of the rotor 710 is corrected after the shaft 11, the rotor core 12, the magnet 13 and the end plate 14 are assembled, and then the centrifugal fan 15 is assembled. However, if the end plate 14 and the centrifugal fan 15 are integrally molded, the shaft 11, the rotor core 12, the magnet 13, the end plate 14, and the centrifugal fan 715 are assembled. The balance adjustment process can be completed with a single balance correction.

Embodiment 8.
A rotating electric machine according to Embodiment 8 will be described below with reference to the drawings.
The rotating electric machine according to the present embodiment differs from the rotating electric machines according to the first to sixth embodiments in the configuration of the stator.
FIG. 11 is a cross-sectional view showing the configuration of rotating electric machine 800 according to the eighth embodiment.
As shown in FIG. 11, the coil end portions 822e of the coils 822 of the stator 820 are sealed and fixed by the potting 23 of the resin agent. The sealed coil end portion 822 e functions as a shroud for the centrifugal fan 15 . At this time, the inner diameter of the potting 23 functioning as a shroud is larger than the outer diameter of the rotor core 12 of the rotor 10 .

According to the rotating electrical machine 800 according to Embodiment 8, the coil 822 is covered and fixed by the potting 23, so that the vibration resistance of the coil 822 can be improved. Moreover, since the potting 23 can function as a shroud for the centrifugal fan 15, the shroud for the centrifugal fan 15 can be omitted, and the moment of inertia of the rotor 10 can be reduced accordingly. In addition, manufacturing of the centrifugal fan 15 is facilitated.

Embodiment 9.
A rotating electric machine according to Embodiment 9 will be described below with reference to the drawings.
The rotating electric machine according to the present embodiment differs from the rotating electric machines according to the first to seventh embodiments in the configuration of the stator.
FIG. 13 is a cross-sectional view of main parts showing the configuration of rotating electric machine 900 according to the ninth embodiment.
As shown in FIG. 13, slots 20S for accommodating the coils 22 of the stator 920 are formed between the tooth portions 21T adjacent in the circumferential direction Y. As shown in FIG.

Then, the coil 22 is fixed by filling the potting 23 made of a resin material in the slot 20S and sealing it. The tooth portion 21T of the stator 920 has shoe portions 21TS that protrude from the inner tip in the radial direction X to both sides in the circumferential direction Y. As shown in FIG. A slot open portion SO is provided between two tooth portions 21T adjacent to each other in the circumferential direction Y. As shown in FIG. A groove 24 extending in the axial direction Z is provided in the resin potting 23 of the slot open portion SO. That is, the potting 23, which is a resin material, communicates with the gap 4 formed between the rotor 10 and the stator 920, and is radially spaced from the slot open portion SO, which is the gap in the circumferential direction Y between the adjacent shoe portions 21TS. A groove 24 extending in the axial direction Z is formed by recessing on the outside of X. As shown in FIG.

The groove 24 provided in the resin material of the slot open portion SO increases the cross-sectional area of the coolant flow path between the stator 920 and the rotor 10, thereby increasing the flow rate of the coolant. Thereby, the cooling capacity of the coil 22 can be improved.

In addition, in the above embodiment, the case of the SPM rotating electric machine has been described, but the present invention is not limited to the SPM rotating electric machine, and can also be applied to an IPM rotating electric machine and the like.

While this application describes various exemplary embodiments and examples, various features, aspects, and functions described in one or more embodiments may not apply to particular embodiments. can be applied to the embodiments singly or in various combinations.
Therefore, countless modifications not illustrated are envisioned within the scope of the technology disclosed in the present application. For example, modification, addition or omission of at least one component, extraction of at least one component, and combination with components of other embodiments shall be included.

100, 200, 300, 400, 600, 700, 800, 900 rotary electric machine, 10, 210, 310, 510, 710 rotor, 11, 211, 311 shaft, 12 rotor core, 13 magnet, 14, 414, 514, 614 end Plate, 414k Notch, 614T Tapered part, 15,715 Centrifugal fan, 15A Shroud, 15S, 715S Shaft, 15W Blade, 16 Bearing, 17 Flux barrier, 20,820,920 Stator, 21 Stator core, 21T Teeth, 21TS Shoe part, SO slot open part, 22, 822 coil, 22e, 822e coil end part, 23 potting, 24 groove, 3, 203 housing, 32 housing body, 33 bracket, 31IN, 231IN, 331IN inlet, 31OUT, 331OUT outlet , 4 Gap, L1 outer diameter, L2 length, O center, P arrow, W1 length, Rrc outer diameter, Rfsi inner diameter, S, 20S slot, X radial direction, Y circumferential direction, Z axial direction.

Claims

a shaft; a rotor core fixed to the shaft; magnets extending in the axial direction of the rotor core and provided at equal intervals in the circumferential direction; and a centrifugal fan provided outside one of the end plates in the axial direction and rotating coaxially with the shaft;
A rotating electric machine comprising a stator having a stator core, a coil wound around the stator core, and a housing in which the stator is fixed,
the housing has a suction port axially outside the other end plate without the centrifugal fan for introducing refrigerant into the housing from the outside;
the housing includes an outlet that faces the centrifugal fan in a radial direction and that discharges the refrigerant to the outside of the housing;
The centrifugal fan has a shroud on the inner side in the axial direction,
The rotating electric machine, wherein the inner diameter of the shroud is larger than the outer diameter of the rotor.
2 . The electric rotating machine according to claim 1 , wherein one end of the discharge port on the stator core side in the axial direction is located closer to the stator core side than the shroud in the axial direction.
3. The electric rotating machine according to claim 1, wherein the shroud has a hollow disc shape facing the coil in the axial direction.
The rotor core has flux barriers axially penetrating on both sides of the magnet in the circumferential direction,
The rotating electric machine according to any one of claims 1 to 3, wherein the end plate includes a notch that communicates with the flux barrier in the axial direction and the radial direction.
The rotary electric machine according to claim 4, wherein the notch is closer to the rotor than the shroud in the axial direction.
The rotor core has flux barriers axially penetrating on both sides of the magnet in the circumferential direction,
The rotating electric machine according to any one of claims 1 to 3, wherein the end plate covers at least a part of the axial end surface of the magnet and does not cover the axial opening of the flux barrier.
7. The rotating electric machine according to claim 6, wherein said end plate has an outer diameter smaller than the distance between said two flux barriers arranged point-symmetrically.
The rotating electric machine according to any one of claims 1 to 7, wherein the end plate has a tapered portion on an outer peripheral surface, the outer diameter of which gradually decreases toward the outer side in the axial direction.
9. The electric rotating machine according to claim 8, wherein the outer diameter of one axially outer end of the tapered portion of the end plate is equal to or smaller than the outer diameter of the root portion of the blade of the centrifugal fan.
9. The electric rotating machine according to claim 8, wherein the outer peripheral surface of one axially outer end of the tapered portion of the end plate continues to the outer peripheral surface of the root portion of the blade of the centrifugal fan.
The rotary electric machine according to any one of claims 1 to 10, wherein the end plate and the centrifugal fan are integrally molded.
The electric rotating machine according to any one of claims 1 to 11, wherein the shroud is potting that covers coil end portions of the coils that are sealed with a resin material.
The electric rotating machine according to any one of claims 1 to 12, wherein the shaft of the rotor is rotatably supported by the housing at only one end in the axial direction.
The stator core has an annular core back portion, tooth portions protruding radially inward from the core back portion, and shoe portions protruding from radially inner ends of the tooth portions to both sides in the circumferential direction,
Slots for accommodating the coils are formed between the tooth portions adjacent in the circumferential direction,
The slot is filled with resin for fixing the coil,
The resin communicates with a gap formed between the rotor and the stator, is recessed radially outward from a slot open portion that is a circumferential gap between the adjacent shoe portions, and extends in the axial direction. The rotary electric machine according to any one of claims 1 to 13, wherein grooves are formed.