JP7108529B2 - Rotating electric machine - Google Patents

Description

The present invention relates to rotating electric machines.

In a rotating electric machine, a magnetic field is formed in a stator core by supplying current to a coil, and magnetic attraction and repulsion are generated between the permanent magnets of the rotor and the stator core. As a result, the rotor rotates with respect to the stator about the rotating shaft.

In the rotating electric machine described above, the rotor heats up due to the influence of eddy currents generated in the magnets, for example, during high-load operation. If the magnet's heat generation reduces the magnetic force (so-called thermal demagnetization), the performance of the rotating electric machine may deteriorate.

As a method for cooling a rotating electric machine, for example, a method is known in which the coolant in the rotating shaft is guided into the interior of the rotor core through the space between the rotor core and the end plate by the centrifugal force generated by the rotation of the rotor core, thereby cooling the rotor core. there is The coolant that has cooled the rotor core passes through the through holes of the end plate and is guided to the outer peripheral edge of the end plate along the outer surface of the end plate facing outward in the axial direction by centrifugal force due to the rotation of the rotor core. The coolant guided to the outer peripheral edge of the end plate is guided to the coils by centrifugal force due to the rotation of the rotor core, and cools the coils.

However, in the cooling method described above, it is conceivable that the coolant guided to the outer peripheral edge of the end plate along the outer surface of the end plate enters the space (air gap) formed between the stator core and the rotor core. When the coolant enters the air gap, it is conceivable that the friction generated between the rotor and the coolant affects the rotational efficiency of the rotor.
As a countermeasure, for example, in Patent Document 1, it is known that the outer peripheral portion of the end plate is protruded in an inclined manner outward in the axial direction. By sloping the outer peripheral portion of the end plate, the coolant guided to the outer peripheral edge of the end plate can be scattered outward in the axial direction away from the air gap by the slanted protrusion. It is said that this can suppress the coolant from entering the air gap.

JP 2013-27244 A

However, according to the configuration of Patent Document 1, it is necessary to bulge the outer peripheral portion of the end plate (that is, the rotor) outward in the axial direction. Therefore, there is a possibility that the size of the rotary electric machine may increase in the axial direction.
Further, the weight of the outer peripheral portion of the end plate (that is, the rotor) is increased by raising the outer peripheral portion of the end plate to the outside in the axial direction. Therefore, it is conceivable that the rotation efficiency of the rotor is affected.

SUMMARY OF THE INVENTION An object of the present invention is to provide a rotating electric machine capable of suppressing entry of a coolant into an air gap without raising the outer peripheral portion of a rotor axially outward.

(1) To achieve the above object, a rotating electrical machine according to an aspect of the present invention (eg, rotating electrical machine 1 in the embodiment) includes a cylindrical stator to which a coil (eg, coil 12 in the embodiment) is mounted. (for example, the stator 3 in the embodiment) and a rotor (for example, the a rotor 4), the rotor having a rotor core (for example, the rotor core in the embodiment) having magnet holding holes (for example, the magnet holding holes 36 in the embodiment) that hold magnets (for example, the permanent magnets 33 in the embodiment); 32) and an end plate (for example, the end plates 34, 35 in the embodiment) arranged to face the end face facing the axial direction of the rotor core (for example, the axial end faces 32a, 32b in the embodiment) and covering the magnet holding holes. and the outer peripheral surface of the end plate (for example, the outer peripheral surfaces 34c and 35c in the embodiment) is a continuous surface that has both axial and radial components and faces in the direction of the spacing. , and a separation surface (for example, separation surfaces 38 and 39 in the embodiment) is formed radially away from the gap from the outer peripheral surface of the end plate, and the separation surface is axially directed toward the rotor core, It extends continuously in a direction away from the space in the radial direction, and the spaced surface is located between the space and the magnet holding hole on the axially facing end surface of the rotor core. and the gap, the end surface facing the axial direction of the rotor core is in contact with the magnet holding hole side.

(2) In the rotary electric machine according to aspect (1) above, the spaced surface may continue to a surface of the end plate facing the rotor core (for example, inner surfaces 34a and 35a in the embodiment).

(3) In the rotary electric machine according to aspect (1) or (2) above, the separation surface may be formed by chamfering.

(4) In the rotary electric machine according to any one of aspects (1) to (3) above, the axial end face of the stator (for example, the first axial end face 11a and the second axial end face 11b in the embodiment) and It may be axially aligned with the axial end surface of the rotor core.

According to the aspect (1) above, it is possible to reduce the surface area of the outer peripheral surface between the spaced surface and the outer peripheral edge of the end plate in the axial direction. Thereby, the amount of refrigerant guided to the outer peripheral surface of the end plate can be reduced. Therefore, the surface tension acting on the coolant guided to the outer peripheral surface can be kept small. Furthermore, the coolant guided to the outer peripheral surface can be axially separated with respect to the spacing.
Therefore, the coolant guided to the outer peripheral surface can be prevented from entering the gap due to surface tension, and the coolant can be directed in the direction opposite to the rotor core (gap).
In particular, by forming the separation surface on the outer peripheral surface of the end plate, it is possible to prevent the coolant from entering the gap without causing the end plate to protrude outward away from the gap in the axial direction. As a result, it is possible to suppress the entry of the coolant into the space without increasing the size of the rotary electric machine in the axial direction or affecting the rotation efficiency of the rotor.

According to the above aspect (2), the groove is formed between the spaced surface and the opposing surface of the end plate and the axially facing end surface of the rotor core. As a result, the coolant that has reached the outer peripheral surface of the end plate can be prevented from reaching the outer peripheral surface of the rotor core and entering the air gap 37 .

According to the above aspect (3), the separation surface is formed by chamfering (that is, C (chamfer) chamfering). As a result, for example, in a process prior to assembling the end plate to the rotor, the separation surface can be easily formed on the single end plate.

According to the above aspect (4), the axial end face of the stator and the axial end face of the rotor core are aligned. An end plate is provided on the axial end face of the rotor core. Therefore, the end plate is arranged at a position axially away from the air gap formed between the stator and the rotor core. That is, the spaced surface can be arranged at a position spaced apart from the air gap in the axial direction.
Thereby, the coolant guided to the outer peripheral edge of the end plate can be axially separated from the air gap. Therefore, the coolant guided to the outer peripheral edge of the end plate can be prevented from entering the air gap due to surface tension.

1 is a cross-sectional view showing a schematic configuration of a rotary electric machine according to an embodiment; FIG. 1 is a partial cross-sectional view of a rotating electric machine according to an embodiment; FIG. FIG. 4 is a cross-sectional view showing the relationship between the first spacing surface and the air gap of the rotating electric machine according to the embodiment; FIG. 4 is a cross-sectional view corresponding to FIG. 3 according to a modified example; FIG. 4 is a cross-sectional view corresponding to FIG. 3 according to a modified example; It is a cross-sectional view showing a main part of a rotating electric machine of a comparative example.

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 is a cross-sectional view showing a schematic configuration of a rotating electric machine 1 according to an embodiment.
A rotating electrical machine 1 shown in FIG. 1 is a running motor mounted in a vehicle such as a hybrid vehicle or an electric vehicle. However, the configuration of the present invention is not limited to a running motor, and can be applied to a power generation motor, a motor for other purposes, and a rotary electric machine (including a generator) other than for vehicles.

The rotary electric machine 1 includes a case 2, a stator 3, a rotor 4, and a coolant supply section 5 (see FIG. 2). In the following description, the direction along the axis C of the shaft 31 to be described later may be simply referred to as the axial direction, the direction orthogonal to the axis C may be referred to as the radial direction, and the direction around the axis C may be referred to as the circumferential direction.

Case 2 houses stator 3 and rotor 4 . A refrigerant 10 (see FIG. 3) is accommodated in the case 2 . The stator 3 described above is arranged in the case 2 with a portion thereof immersed in the coolant 10 . As the refrigerant 10, ATF (Automatic Transmission Fluid) or the like, which is hydraulic oil used for lubrication of a transmission, power transmission, etc., is preferably used.

FIG. 2 is a partial cross-sectional view of the rotating electric machine 1. As shown in FIG.
As shown in FIG. 2 , the stator 3 includes a stator core 11 and coils 12 attached to the stator core 11 .
The stator core 11 is cylindrical and arranged coaxially with the axis C. As shown in FIG. The stator core 11 is fixed, for example, to the inner peripheral surface of the case 2 (see FIG. 1). The stator core 11 has a first axial end face (an axial end face of the stator 3) 11a and a second axial end face (an axial end face of the stator 3) 11b facing the axial direction.
The stator core 11 is configured by laminating electromagnetic steel sheets in the axial direction. Note that the stator core 11 may be a so-called dust core.

The coil 12 is attached to the stator core 11 . The coil 12 has a U-phase coil, a V-phase coil, and a W-phase coil arranged with a phase difference of 120° relative to each other in the circumferential direction. The coil 12 has an insertion portion 12a inserted through a slot (not shown) of the stator core 11 and coil end portions 12b and 12c protruding 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 radially inside the stator 3 with a space 37 therebetween. The rotor 4 is configured to be rotatable around the axis C so as to face the stator 3 . The rotor 4 includes a shaft 31, a rotor core 32, permanent magnets 33, and end plates (first end plate 34 and second end plate 35). The interval 37 between the stator 3 and the rotor 4 is hereinafter referred to as "air gap 37".

The shaft 31 is supported by the case 2 so as to be rotatable around the axis C via bearings (first bearing 41 and second bearing 42).

The rotor core 32 is formed in a cylindrical shape coaxial with the axis C. As shown in FIG. A shaft 31 is press-fitted and fixed inside the rotor core 32 . The rotor core 32 may be configured by laminating electromagnetic steel sheets in the axial direction, similarly to the stator core 11, or may be a dust core.

The rotor core 32 has a first axial end face (axial end face) 32a and a second axial end face (axial end face) 32b facing the axial direction.
The first axial end face 32a of the rotor core 32 and the first axial end face 11a of the stator core 11 are aligned in the axial direction of the axis C so as to be flush with each other. Further, the second axial end surface 32b of the rotor core 32 and the second axial end surface 11b of the stator core 11 are aligned so as to be flush with each other in the axial direction of the axis C. As shown in FIG. However, the axial positions of the first axial end faces 11a and 32a and the second axial end faces 11b and 32b may be different from each other.

An air gap 37 is formed between the stator core 11 and the rotor core 32 here. Therefore, the axial first side end portion of the air gap 37 is aligned with the first axial end surface 32 a of the rotor core 32 so as to be flush with the axial direction. Further, the axial second side end portion of the air gap 37 is aligned with the second axial end surface 32 b of the rotor core 32 so as to be flush with the axial direction.

A magnet holding hole 36 is formed in the outer peripheral portion of the rotor core 32 so as to penetrate the rotor core 32 in the axial direction. A plurality of magnet holding holes 36 are formed at intervals in the circumferential direction. A permanent magnet 33 is inserted into each magnet holding hole 36 . A through hole 40 is formed in the inner peripheral portion of the rotor core 32 so as to penetrate the rotor core 32 in the axial direction. A plurality of through holes 40 are formed at intervals in the circumferential and radial directions.

The first end face plate 34 is provided with an inner side face 34a in contact with the first axial end face 32a of the rotor core 32 in the axial direction. The first end plate 34 is press-fitted onto the shaft 31 and covers at least the magnet holding holes 36 in the rotor core 32 from the first side in the axial direction.
In this state, the outer surface 34b of the first end plate 34 is arranged opposite the first axial end surface 32a. An outer surface 34b of the first end plate 34 forms a first axial end surface of the rotor 4 and is formed into a flat surface perpendicular to the axial direction.
The outer peripheral surface 34c of the first end plate 34 is aligned with the outer peripheral surface 32c of the rotor core 32 so as to be radially flush with the outer peripheral surface 34c. A first separation surface (separation surface) 38 is formed on the outer peripheral surface 34 c of the first end plate 34 . The first spacing surface 38 is annularly formed along the outer peripheral surface 34c.

The second end plate 35 is provided with the inner side surface 35a in contact with the second axial end surface 32b of the rotor core 32 in the axial direction. The second end plate 35 covers at least the magnet holding holes 36 in the rotor core 32 from the second side in the axial direction while being press-fitted and fixed to the shaft 31 .
In this state, the outer surface 35b of the second end plate 35 is arranged on the opposite side of the second axial end surface 32b. The outer surface 35b of the second end plate 35 forms a second axial end surface of the rotor 4 and is formed into a flat surface orthogonal to the axial direction.
Further, the outer peripheral surface 35c of the second end plate 35 is aligned with the outer peripheral surface 32c of the rotor core 32 so as to be radially flush with the outer peripheral surface 35c. A second separation surface (separation surface) 39 is formed on the outer peripheral surface 35 c of the second end plate 35 . The second spacing surface 39 is annularly formed along the outer peripheral surface 35c.

Thus, the first spacing surface 38 is formed on the first end plate 34 and the second spacing surface 39 is formed on the second end plate 35 . Therefore, for example, in the process prior to assembling the first and second spacing surfaces 38 and 39 to the rotor core 32 , the first spacing surface 38 is formed on the first end plate 34 and the second spacing surface 39 is formed on the second end plate 35 . can be formed. This makes it possible to easily form the first separation surface 38 on the first end plate 34 and easily form the second separation surface 39 on the second end plate 35 .

The refrigerant supply unit 5 supplies the stator 3, the rotor 4, and the like with the refrigerant 10 sent out by driving the refrigerant pump. The refrigerant pump may be a so-called mechanical pump that is driven in conjunction with the rotation of the shaft 31 or a so-called electric pump that is driven independently of the rotation of the shaft 31 .

The coolant supply unit 5 includes a shaft channel 51 , a first end plate channel 52 and a second end plate channel 53 .

The shaft channel 51 has an axial channel 61 and a discharge port 62 .
The axial flow path 61 extends axially at a position coaxial with the axis C within the shaft 31 . Refrigerant 10 delivered from the refrigerant pump circulates in the axial flow path 61 along the axial direction.

The discharge port 62 is formed in the shaft 31 at the same position as the first end plate 34 in the axial direction. The discharge port 62 extends radially through the shaft 31 . A radially inner end portion of the discharge port 62 communicates with the interior of the axial flow path 61 . A radially outer end of the discharge port 62 is open on the outer peripheral surface of the shaft 31 . The coolant 10 flowing in the axial flow path 61 flows into the discharge port 62 .

The first end plate flow path 52 circulates the coolant 10 flowing in from the discharge port 62 from the inside to the outside in the radial direction by the centrifugal force caused by the rotation of the rotor 4 . Specifically, the first end plate channel 52 includes a rotor inlet channel 71 and a stator supply channel 72 .

The rotor inlet channel 71 extends radially through the first end plate 34 . A radially inner end portion of the rotor inlet channel 71 communicates with the discharge port 62 described above. That is, the coolant 10 flowing through the discharge port 62 flows into the rotor inlet channel 71 . A radially outer end of the rotor inlet channel 71 terminates at the outer peripheral portion of the first end plate 34 .

The rotor inlet channel 71 opens on the inner side surface 34a of the first end plate 34 . The rotor inlet channel 71 communicates with the through hole 40 described above. The coolant 10 flowing through the rotor inlet channel 71 can flow into the through hole 40 in the process of flowing outward in the radial direction. That is, the through holes 40 also function as cooling passages for cooling the rotor core 32 .

The stator supply channel 72 is connected to the downstream end (the radially outer end) of the rotor inlet channel 71 . The stator supply passage 72 axially penetrates through the first end plate 34 . That is, the rotor inlet channel 71 described above communicates with the outside of the rotor 4 through the stator supply channel 72 .

The second end plate flow path 53 discharges the coolant 10 flowing inside the rotor 4 from the rotor 4 by, for example, centrifugal force accompanying the rotation of the rotor 4 . The second end plate channel 53 has a confluence channel 81 and a stator supply channel 82 .
The confluence channel 81 radially extends through the second end plate 35 . The confluence channel 81 opens on the inner surface 35 a of the second end plate 35 . The confluence channel 81 communicates with the magnet holding hole 36 and the through hole 40 described above.

The stator supply passage 82 communicates with the radially outer end of the confluence passage 81 . The stator supply path 82 axially penetrates the second end plate 35 . That is, the confluence passage 81 described above communicates with the outside of the rotor 4 through the stator supply passage 82 . A plurality of first end plate flow paths 52 and second end plate flow paths 53 may be formed in the circumferential direction.

Here, the first separation surface 38 is formed on the outer peripheral surface 34c of the first end plate 34 as described above. Further, the second separation surface 39 is formed on the outer peripheral surface 35c of the second end plate 35 as described above. The first spacing surface 38 and the second spacing surface 39 are formed symmetrically in the axial direction. That is, of the outer peripheral surface of the rotor 4, a first spacing surface 38 is provided at a first end in the axial direction, and a second spacing surface 39 is provided at a second end in the axial direction. Therefore, the first spacing surface 38 will be described in detail below, and the detailed description of the second spacing surface 39 will be omitted.

FIG. 3 is a cross-sectional view showing the relationship between the first spacing surface 38 of the rotary electric machine 1 and the air gap 37. As shown in FIG.
As shown in FIG. 3, the first separation surface 38 is formed in a straight line shape extending across the axial direction by chamfering (C (chamfer) chamfering) the outer peripheral surface 34c of the first end plate 34, for example. there is That is, the normal direction of the first separation surface 38 has at least one component of the axial direction and the radial direction, faces the direction of the air gap 37, and is located further than the outer peripheral surface 34c of the first end plate 34. It is a surface that is radially spaced from the air gap 37 . The first separation surface 38 of the present embodiment is formed as an inclined surface extending radially inward from the axial outer side to the inner side (from the outer side surface 34b to the inner side surface 34a side). An imaginary line L passing through the outer peripheral surface 34c of the first end plate 34 and extending in the axial direction forms an acute angle θ with the first separation surface 38 . That is, the normal direction of the first spacing surface 38 of the present embodiment intersects with the axial direction and the radial direction.

The first spaced surface 38 continues to the inner surface 34 a of the first end plate 34 . Thereby, a groove portion 46 is formed between the first separation surface 38 and the first axial end surface 32a. The groove portion 46 is formed to have a V-shaped cross section, so that an opening portion 46 a is formed in the outer peripheral surface 34 c of the first end plate 34 .

[Action]
Next, the action of cooling the rotating electrical machine 1 described above with the coolant 10 will be described with reference to FIGS. 2 to 4. FIG.
As shown in FIG. 2, the coolant 10 (see FIG. 3) is guided to the axial channel 61 of the shaft channel 51. As shown in FIG. Refrigerant 10 guided to axial flow path 61 flows mainly along the inner peripheral surface of axial flow path 61 due to the action of the refrigerant pump and the centrifugal force accompanying the rotation of rotor 4, and flows from the second side in the axial direction. Flow towards the first side.
A portion of the coolant 10 guided to the axial flow path 61 flows into the discharge port 62 . The coolant 10 that has flowed into the discharge port 62 flows radially outward through the discharge port 62 and then flows into the rotor inlet channel 71 of the first end plate channel 52 . In the first end plate flow path 52 , the coolant 10 flows from the radially inner side to the outer side due to the centrifugal force caused by the rotation of the rotor 4 .

Some of the coolant 10 that has flowed into the rotor inlet channel 71 flows into the stator supply channel 72 while flowing radially outward in the rotor inlet channel 71 . The coolant 10 that has flowed into the stator supply passage 72 is discharged outside the rotor 4 through the stator supply passage 72 . The coolant 10 discharged from the stator supply passage 72 scatters radially outward due to centrifugal force, and is supplied to the coil end portion 12 b located on the first side in the axial direction with respect to the stator core 11 . Thereby, the coil end portion 12b is cooled.
The effect of scattering the coolant 10 radially outward by centrifugal force will be described in detail with reference to FIG.

On the other hand, part of the coolant 10 of the coolant 10 that has flowed into the rotor inlet channel 71 flows into the through hole 40 in the process of flowing radially outward in the rotor inlet channel 71 . The coolant 10 that has flowed into the through hole 40 flows through the through hole 40 toward the second side in the axial direction. The rotor 4 is thereby cooled. The coolant 10 that has passed through the through hole 40 flows into the confluence flow path 81 . The coolant 10 that has flowed into the combined flow path 81 flows radially outward through the combined flow path 81 and is then discharged to the outside of the rotor 4 through the stator supply path 82 . The coolant 10 discharged from the stator supply passage 82 scatters radially outward due to centrifugal force, and is supplied to the coil end portion 12c located on the second side in the axial direction with respect to the stator core 11 . This cools the coil end portion 12c.

Next, the effect of scattering the coolant 10 radially outward by centrifugal force will be described in detail with reference to FIG.
As shown in FIG. 3 , the coolant 10 that has flowed from the rotor inlet channel 71 into the stator supply channel 72 is discharged outside the first end plate 34 (outside the rotor 4 ) through the stator supply channel 72 . The coolant 10 discharged to the outside of the rotor 4 is guided to the outer peripheral surface 34c through the outer peripheral surface 34b and the outer peripheral edge 34d of the first end plate 34. As shown in FIG.

Here, in the present embodiment, the normal direction has at least one component of the axial direction and the radial direction and is directed toward the air gap 37, and the air gap is greater than the outer peripheral surface 34c of the first end plate 34. A first spacing surface 38 is radially spaced apart from the gap 37 .
According to this configuration, the surface area of the outer peripheral surface 34c can be reduced between the first spaced surface 38 and the outer peripheral edge 34d in the axial direction. As a result, the amount of refrigerant introduced to the outer peripheral surface 34c of the first end plate 34 can be reduced. Therefore, the surface tension acting on the coolant 10 guided to the outer peripheral surface 34c can be kept small. Furthermore, the coolant 10 guided to the outer peripheral surface 34 c can be axially separated from the air gap 37 .
Therefore, the coolant 10 guided to the outer peripheral surface 34c can be prevented from entering the air gap 37 by surface tension, and the coolant 10 can be directed in the direction opposite to the rotor core 32 (air gap 37). .

In particular, by forming the first separation surface 38 on the outer peripheral surface 34 c of the first end plate 34 , the first end plate 34 does not protrude outward away from the air gap 37 in the axial direction. can prevent entry into As a result, entry of the coolant 10 into the air gap 37 can be suppressed without increasing the size of the rotary electric machine 1 in the axial direction and without affecting the rotational efficiency of the rotor 4 .

In this embodiment, the first separation surface 38 is configured to continue to the inner surface 34 a of the first end plate 34 .
According to this configuration, a groove portion 46 is formed between the first spacing surface 38 and the first axial end surface 32a. This can prevent the coolant 10 that has reached the outer peripheral surface 34 c of the first end plate 34 from reaching the outer peripheral surface 32 c of the rotor core 32 and entering the air gap 37 .

In the present embodiment, since the first separation surface 38 is formed by chamfering, the first separation surface 38 can be easily formed on the single first end plate 34 in the process prior to assembling the first end plate 34 to the rotor core 32, for example. can be formed.

In this embodiment, the axial first side end of the air gap 37 is aligned with the first axial end surface 32 a of the rotor core 32 so as to be flush with the axial direction.
Thereby, the coolant 10 guided to the outer peripheral edge 34 d of the first end plate 34 can be axially separated from the air gap 37 . Therefore, the coolant 10 guided to the outer peripheral edge 34d of the first end plate 34 can be prevented from entering the air gap 37 due to surface tension.

FIG. 6 is a cross-sectional view showing a main part of a rotating electric machine 100 of a comparative example. In FIG. 6, the same or similar components as those of the rotary electric machine 1 of the embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.
In the rotating electric machine 100 of the comparative example, the first separation surface 38 of the embodiment is not formed on the outer peripheral surface 101a of the first end plate 101 . Therefore, the surface area of the outer peripheral surface 101a of the first end plate 101 is larger than the outer peripheral surface 34c of the embodiment.
Therefore, the amount of refrigerant 10 guided to the outer peripheral surface 101a of the first end plate 101 is increased compared to the refrigerant 10 guided to the outer peripheral surface 34c of the embodiment. As a result, it is conceivable that the coolant 10 on the outer peripheral surface 101 a is guided until it approaches the air gap 37 and the coolant 10 enters the air gap 37 .

The technical scope of the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the present invention.
For example, in the above-described embodiment, an example in which the first separation surface 38 is chamfered to form a straight line has been described, but the present invention is not limited to this. As another example, the first spacing surface 38 may be curved as shown in FIG. 4, or may be stepped as shown in FIG. Even in such a case, the first spacing surface 38 has at least one component of the axial direction and the radial direction in its normal direction and faces the direction of the air gap 37 . It is radially spaced from the air gap 37 more than the outer peripheral surface 34c.

In the above embodiment, the case where the first spacing surface 38 is formed on a part of the outer peripheral surface 34c of the first end plate 34 has been described, but the configuration is not limited to this. The first spacing surface 38 may be formed over the entire outer peripheral surface 34c.
In the above embodiment, the configuration in which the first spacing surface 38 continues to the inner surface 34a of the first end plate 34 has been described, but the configuration is not limited to this configuration.
In the above embodiment, the configuration in which the separation surfaces 38 and 39 are formed in an annular shape has been described.
In the above embodiment, the case where the coolant 10 adheres to the outer peripheral surfaces 34c and 35c after passing through the axial flow path 61 has been described, but the configuration is not limited to this. That is, the coolant may adhere to the end plates 34, 35 (outer peripheral surfaces 34c, 35c) from the outside of the rotor 4. FIG.

In addition, it is possible to appropriately replace the constituent elements in the above-described embodiment with well-known constituent elements without departing from the scope of the present invention, and the above-described modified examples may be combined as appropriate.

Reference Signs List 1 Rotating electric machine 3 Stator 4 Rotor 11 Stator core 11a First axial end face (end face)
11b... Second axial end face (end face)
32 Rotor core 32a First axial end face (end face)
32b... Second axial end face (end face)
33... Permanent magnet 36... Magnet holding hole 34... First end plate (end plate)
34a... Inner surface (facing surface)
34c... Peripheral surface (peripheral surface)
35... Second end plate (end plate)
35c... Outer peripheral surface 38... First separation surface (separation surface)
39... Second separation surface (separation surface)

Claims (4)

a cylindrical stator to which a coil is attached;
a rotor configured to be rotatable while being spaced radially inward from the stator;
The rotor is
a rotor core having magnet holding holes for holding magnets;
an end plate facing the end face of the rotor core facing the axial direction and covering the magnet holding hole;
On the outer peripheral surface of the end plate, there is provided a spaced surface that has both axial and radial components and faces the direction of the spacing, and that is further radially away from the spacing than the outer peripheral surface of the end plate. is formed and
The separation surface extends continuously in a direction away from the gap in the radial direction toward the rotor core in the axial direction ,
The spaced surface is located between the magnet holding hole and the space on the end surface of the rotor core facing the axial direction, and is located closer to the magnet holding hole than an intermediate position between the magnet holding hole and the space in the radial direction. rotating electric machine in contact with the end face facing the axial direction of 2. The electric rotating machine according to claim 1, wherein the spaced surface continues to a surface of the end plate facing the rotor core. 3. The electric rotating machine according to claim 1, wherein said separation surface is formed by chamfering. The rotary electric machine according to any one of claims 1 to 3, wherein the axial end face of the stator and the axial end face of the rotor core are aligned in the axial direction.

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