JP2023096954A - Rotary electric machine - Google Patents

Abstract

To provide a rotary electric machine capable of suppressing reduction in cooling performance of a rotor and a stator by properly circulating a coolant.SOLUTION: A rotary electric machine comprises: a rotor 30 which is rotationally driven by a rotor shaft 20; a stator 40 which is disposed at an outer peripheral side of the rotor 30 and includes a stator core 41 and a stator coil 42; and end plates which are provided at both surface sides of the rotor 30. The rotor 30 includes an internal passage 32 which communicates in an axial direction, and a first end plate 34 includes: a first coolant passage groove 50 from the rotor shaft 20 to the internal passage 32; and a second coolant passage groove 51 extending from the internal passage 32 to an outer peripheral side of a second end plate 35.SELECTED DRAWING: Figure 2

Description

The present invention relates to a rotating electrical machine mounted on an electric vehicle or the like.

2. Description of the Related Art Conventionally, a rotating electric machine is mounted on an electric vehicle or the like. A rotating electric machine needs to be cooled in order to suppress deterioration in performance due to heat generation of coils arranged in a stator.

As a stator cooling structure, the rotating electrical machine includes a first cooling mechanism that supplies coolant to the stator coils from the outer periphery of the stator, and a second cooling mechanism that supplies coolant to the stator coils from the inner periphery of the stator. In order to improve the efficiency, a technique has been disclosed in which a coolant is supplied to the axial center and circulated inside the rotor (see, for example, Patent Document 1).

JP 2019-110695 A

However, in the rotary electric machine of Patent Document 1, the path through which the coolant circulates inside the rotating body is based on the premise that the rotation axis is parallel to the ground, and the axis is perpendicular to the ground. In this case, there is a problem that the refrigerant cannot be circulated as desired.
SUMMARY OF THE INVENTION It is an object of the present invention to provide a rotating electric machine capable of properly circulating a coolant and suppressing deterioration in cooling performance of a rotor and a stator. do.

In order to solve the above-described problems, a rotating electric machine according to the present invention provides a rotor that is rotationally driven by a rotor shaft, a stator that is arranged on the outer peripheral side of the rotor and has a stator core and stator coils, and stators that are provided on both sides of the rotor. the rotor includes an internal flow path that communicates in the axial direction; the end plate includes a first coolant flow path groove extending from the rotor shaft to the internal flow path; and a second coolant channel groove extending from the internal channel to the outer peripheral side of the end plate.

According to the present invention, the coolant can be circulated from the center side of the rotor to the outer peripheral side of the rotor via the first coolant channel groove, the internal channel, and the second coolant channel groove, The rotor, magnets of the rotor and stator coils of the stator can be efficiently cooled. In addition, by providing the first coolant channel groove and the second coolant channel groove, a path for circulation from the center side of the rotor to the outer peripheral side is formed, so that the axial direction of the rotor shaft is aligned with the ground. Refrigerant can be circulated even when installed substantially vertically. Furthermore, since the end plates provided on both sides of the rotor are provided with the first coolant channel groove and the second coolant channel groove, respectively, there is no need to change the magnetic circuit of the rotor, stator, etc. A decrease in characteristics can be suppressed.

BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing which shows embodiment of the rotary electric machine which concerns on this invention. BRIEF DESCRIPTION OF THE DRAWINGS It is the perspective view which made the cross section a part of rotary electric machine of 1st Embodiment. 3 is an enlarged view of a first end plate and a rotor portion of the first embodiment; FIG. It is a top view which shows the 1st end plate of 1st Embodiment. It is an enlarged view of a second end plate and a rotor portion of the first embodiment. It is a top view which shows the 2nd end plate of 1st Embodiment. It is a top view which shows the rotor of 1st Embodiment. It is a top view which shows the 1st end plate by 2nd Embodiment. FIG. 11 is a plan view showing relative positions of the first coolant channel grooves with respect to the rotor according to the second embodiment; It is a top view which shows the 2nd end plate by 2nd Embodiment. FIG. 11 is a plan view showing relative positions of second coolant channel grooves with respect to the rotor according to the second embodiment; FIG. 11 is a schematic cross-sectional view of a first coolant channel groove portion showing a third embodiment;

An embodiment of the rotating electric machine of the present invention will be described below with reference to the accompanying drawings.
FIG. 1 is a cross-sectional view showing an embodiment of a rotating electric machine according to the present invention.
As shown in FIG. 1 , a rotating electrical machine 1 according to this embodiment includes a motor 10 and a generator 11 .
Since the motor 10 and the generator 11 have the same basic configuration, the configuration of the motor 10 will be mainly described below.
The motor 10 is a so-called inner rotor type electric rotating machine, which includes a rotor 30 press-fitted onto a rotor shaft 20 and a stator 40 arranged to face the outer diameter side of the rotor 30 with a small gap therebetween. 1.

The rotor 30 has a rotor core 31 into which the rotor shaft 20 is press-fitted. The rotor core 31 is configured by, for example, laminating a plurality of electromagnetic steel sheets formed by press working in the axial direction and joining them by caulking, adhesion, or the like. The rotor core 31 has a plurality of internal flow passages 32 which are axially formed through the outer diameter side and the inner diameter side. In addition, magnets 33 are arranged at equal intervals in the circumferential direction on the outer peripheral portion of the rotor core 31 . The magnet 33 is a permanent magnet such as a neodymium magnet, for example, and has a magnetic pole portion formed by N poles and S poles arranged at a predetermined pitch.

The rotor 30 includes a rotor core 31 pivotally supported by the rotor shaft 20 , a first end plate 34 arranged on one side of the rotor core 31 in the axial direction, and a second end plate arranged on the other side of the rotor core 31 in the axial direction. a plate 35;

The stator 40 includes a stator core 41 in which a plurality of slots (not shown) penetrating in the axial direction are arranged at predetermined intervals in the circumferential direction, and a plurality of phases (eg, U phase, V phase, W phase) accommodated in the slots. and a stator coil 42 of

A coolant passage 21 is formed in the rotor shaft 20 through which coolant flows. The coolant channel 21 extends in the axial direction inside the rotor shaft 20 and is configured so that the coolant can be supplied from the outside. As the refrigerant, for example, ATF (Automatic Transmission Fluid) is used. The coolant flow path 21 is connected to a circulation path 22 formed in the casing 2 of the rotary electric machine 1 .

The first end plate 34 is arranged to face one axial end surface of the rotor core 31 . An insertion hole 36 through which the rotor shaft 20 is inserted is formed in the center of the first end plate 34 . A plurality of discharge ports 37 are formed at equal intervals in the circumferential direction on the radially outer side of the first end plate 34 .

FIG. 2 is a perspective view of a part of the rotary electric machine 1 of the present embodiment in cross section. FIG. 3 is an enlarged view of the first end plate 34 and rotor 30 portion. FIG. 4 is a plan view showing the first end plate 34 of this embodiment. FIG. 5 is an enlarged view of the second end plate 35 and the rotor 30 portion. FIG. 6 is a plan view showing the second end plate 35 of this embodiment. FIG. 7 is a plan view showing the rotor 30 of this embodiment.

As shown in FIGS. 2 to 4, a first coolant channel groove 50 is formed in the inner surface of the first end plate 34 .
The first coolant channel groove 50 is formed extending in the radial direction of the first end plate 34 . A center side end portion of the first coolant channel groove 50 communicates with the insertion hole 36 , and a radially outer end portion of the first coolant channel groove 50 communicates with the internal channel 32 . there is
With this configuration, the coolant supplied to the rotor shaft 20 is sent to the insertion hole 36 of the rotor 30, and flows through the first coolant flow channel groove 50 as shown in FIGS. It is sent to the internal channel 32 .

The second end plate 35 is arranged to face the end surface of the rotor core 31 on the other side in the axial direction. An insertion hole 36 through which the rotor shaft 20 is inserted is formed in the center of the second end plate 35 . A plurality of discharge ports 37 are formed at equal intervals in the circumferential direction on the radially outer side of the second end plate 35 .
Further, as shown in FIGS. 2, 5, and 6, a second coolant channel groove 51 is formed in the inner surface of the second end plate 35. As shown in FIGS.

The second coolant channel groove 51 is formed extending in the radial direction of the second end plate 35 . A radial inner end portion of the second coolant channel groove 51 communicates with the internal channel 32 , and a radial outer end portion of the second coolant channel groove 51 communicates with the discharge port 37 . ing.
With this configuration, the coolant sent to the internal channel 32 by the first coolant channel groove 50 is discharged through the second coolant channel groove 51 as shown in FIG. sent to 37.

Further, the first coolant channel groove 50 and the second coolant channel groove 51 are provided at positions avoiding the openings 32 a forming the internal channel 32 provided in the rotor 30 .
With this configuration, when the coolant flows through the first coolant channel grooves 50 and the second coolant channel grooves 51, leakage of the coolant from the openings 32a can be suppressed.

That is, the coolant sent to the rotor shaft 20 sequentially passes through the coolant channel 21, the first coolant channel groove 50, the internal channel 32, the second coolant channel groove 51, and the discharge portion 43. The rotor 30 is cooled from the inside, and the coolant after cooling the rotor 30 is discharged radially outward from the discharge port 37 by centrifugal force, so that the stator coil 42 is cooled from the inner peripheral side of the stator 40. It is configured.

Next, the operation of this embodiment will be described.
In the present embodiment, the coolant sent to rotor shaft 20 is circulated through coolant channel 21 , first coolant channel grooves 50 , and internal channel 32 .
As a result, the rotor 30 can be cooled by supplying the coolant to the internal channel 32 of the rotor 30 through the first coolant channel grooves 50 .

The coolant that has cooled the internal flow path 32 passes through the first end plate 34 provided with the first coolant flow path groove 50 and the second coolant flow path provided in the second end plate 35 on the opposite side. It is sent to the discharge port 37 by the cleaning groove 51 .
As a result, the coolant can be supplied to the vicinity of the magnets 33 of the rotor 30, and the vicinity of the magnets 33 can be cooled.
Furthermore, the inside of the stator coil 42 of the stator 40 can also be cooled by discharging the coolant from the discharge port 37 .

By providing the first coolant channel grooves 50 and the second coolant channel grooves 51 in this manner, the coolant sent to the rotor shaft 20 can be channeled through the first coolant channel grooves 50 and the internal channel 32 . , through the second coolant passage grooves 51, respectively. However, it is possible to circulate the refrigerant.

In the present embodiment, the second coolant channel groove 51 is formed to extend to the discharge port 37, but may be formed to communicate with the outer peripheral surface of the rotor 30, for example. good too.
With this configuration, the coolant is discharged in the centrifugal direction from the outer peripheral side of the rotor 30 instead of the discharge port 37, thereby efficiently circulating the coolant to the inside of the stator 40 and the stator coil 42. can be made

As described above, in the present embodiment, the rotor 30 rotationally driven by the rotor shaft 20, the stator 40 arranged on the outer peripheral side of the rotor 30 and having the stator core 41 and the stator coil 42, and the rotor 30 and end plates provided on both sides, the rotor 30 is provided with an internal flow path 32 that communicates in the axial direction, and the first end plate 34 is provided with a first coolant from the rotor shaft 20 to the internal flow path 32. A channel groove 50 and a second coolant channel groove 51 extending from the internal channel 32 to the outer peripheral side of the second end plate 35 are provided.

As a result, the coolant sent to the rotor shaft 20 is circulated to the outer peripheral side of the rotor 30 via the first coolant channel groove 50, the internal channel 32, and the second coolant channel groove 51. Therefore, the rotor 30, the magnets 33 of the rotor 30, and the stator coils 42 of the stator 40 can be efficiently cooled. Further, by providing the first coolant channel groove 50 and the second coolant channel groove 51, a path for circulation from the center side of the rotor 30 to the outer peripheral side is formed. It is possible to circulate the refrigerant even when the is installed substantially perpendicular to the ground.
Furthermore, since the first end plate 34 and the second end plate 35 provided on both sides of the rotor 30 are provided with the first coolant channel grooves 50 and the second coolant channel grooves 51, respectively, the rotor 30 and the stator 40 There is no need to change the magnetic circuit such as the magnetic circuit, and deterioration of the characteristics of the magnetic circuit can be suppressed.

Further, in the present embodiment, the first coolant channel groove 50 and the second coolant channel groove 51 are provided at positions avoiding the opening 32 a provided in the rotor 30 .
Thus, when the coolant flows through the first coolant channel grooves 50 and the second coolant channel grooves 51, it is possible to prevent the coolant from leaking from the openings 32a.

Next, a second embodiment of the invention will be described.
FIG. 8 is a plan view showing the first end plate 34 according to the second embodiment of the invention. FIG. 9 is a plan view showing relative positions of the first coolant channel grooves 50 with respect to the rotor 30 according to the second embodiment. FIG. 10 is a plan view showing the second end plate 35 according to the second embodiment of the invention. FIG. 11 is a plan view showing the relative positions of the second coolant channel grooves 51 with respect to the rotor 30 according to the second embodiment.

In the present embodiment, the first coolant channel grooves 50 are provided so as to be inclined at a predetermined angle with respect to the radial direction of the first end plate 34 .
Further, the second coolant channel groove 51 is provided so as to be inclined at a predetermined angle with respect to the radial direction of the second end plate 35 .
In this case, the first coolant channel groove 50 and the second coolant channel groove 51 are provided at positions avoiding the openings 32 a of the internal channel 32 of the rotor 30 . Therefore, the inclination angles of the first coolant channel groove 50 and the second coolant channel groove 51 differ depending on the positions of the openings 32 a formed in the rotor 30 .
The inclination angles of the first coolant channel groove 50 and the second coolant channel groove 51 may be set to arbitrary angles. In this case, it is possible to change the flow velocity of the coolant at any position on the first end plate 34 or the second end plate 35 .

In the present embodiment, by providing the first coolant channel groove 50 and the second coolant channel groove 51 at an angle, the internal channel 32 can move through the first coolant channel groove 50. As compared with the case where the first coolant flow path grooves 50 are provided in the radial direction of the first end plate 34, the resistance when the coolant flows is higher. As a result, the flow velocity of the coolant decreases, thereby increasing the residence time of the coolant and improving the cooling efficiency.

In addition, in the present embodiment, the second coolant channel groove 51 is formed so as to communicate with the outer peripheral surface of the rotor 30 .
By configuring in this way, the coolant is discharged from the outer peripheral side of the rotor 30 in the centrifugal direction.

As described above, in the present embodiment, the first coolant channel groove 50 or the second coolant channel groove 51 is provided to be inclined with respect to the radial direction of the end plate.
As a result, by providing the first coolant channel groove 50 and the second coolant channel groove 51 at an angle, the resistance when the coolant flows is increased, and the flow speed of the coolant is reduced. can be done. As a result, the residence time of the coolant becomes longer, and the cooling efficiency can be improved.

Further, in the present embodiment, the second coolant channel groove 51 extends from the internal channel 32 to the outer circumference of the end plate.
As a result, the coolant is discharged from the outer peripheral side of rotor 30 in the centrifugal direction, so that the coolant can be efficiently circulated to the inside of stator 40 and stator coil 42 .

Next, a third embodiment of the invention will be described.
FIG. 12 is a schematic cross-sectional view of the first coolant channel groove 50 portion showing the third embodiment of the present invention.
As shown in FIG. 12, in the present embodiment, guide members 52 projecting toward the rotor 30 are provided on both sides of the first coolant channel groove 50 and the second coolant channel groove 51. ing. A tapered surface 53 is formed at the tip of the guide member 52 so that the outer length is longer than the inner length.
The guide member 52 is engaged with the opening 32 a of the rotor 30 when the first end plate 34 or the second end plate 35 is attached to the side surface of the rotor 30 .

In this case, by engaging the guide member 52 with the opening 32a of the rotor 30, the positioning of the rotor 30 and the first end plate 34 and the second end plate 35 can be easily performed. In particular, a tapered surface 53 is formed at the tip of the guide member 52 , and when the tip of the guide member 52 abuts against the opening 32 a of the rotor 30 , the first end plate 34 is guided by the tapered surface 53 . Alternatively, since the second end plate 35 can be engaged, the first end plate 34 or the second end plate 35 can be easily engaged at a predetermined position.

In the present embodiment, when the coolant flows through the first coolant channel grooves 50 and the second coolant channel grooves 51, the coolant is held by the guide member 52. Leakage from the coolant channel grooves 50 and the second coolant channel grooves 51 can be suppressed.

As described above, in the present embodiment, the first end plate 34 and the second end plate 35 (end plates) are provided with the first coolant channel grooves 50 and the second coolant channel grooves 51. Guide members 52 are provided on both sides of the .
As a result, when the coolant flows through the first coolant channel grooves 50 and the second coolant channel grooves 51, the coolant is held by the guide member 52, so that the coolant flows through the first coolant channel grooves 50 and 51. It is possible to suppress leakage from the coolant groove 50 and the second coolant flow channel groove 51 . Further, by engaging the guide member 52 with the opening 32a portion of the rotor 30, the rotor 30 can be easily positioned with the first end plate 34 and the second end plate 35, thereby simplifying the assembly man-hours. be able to.

Although the present invention has been described in the above embodiments, the present invention is not limited to the above embodiments, and various modifications, replacements, additions, omissions, etc. are possible as necessary.
For example, in the first embodiment, the second coolant channel groove 51 is provided up to the position corresponding to the outlet 37 of the second end plate 35 shown in FIG. The road groove 51 may be formed so as to extend to the radially outer side of the rotor 30 .
As a result, the stator 40 and the stator coils 42 can be efficiently cooled also in the first embodiment.

[Configuration supported by the above embodiment]
The above embodiment supports the following configurations.

(Configuration 1)
a rotor that is rotationally driven by a rotor shaft; a stator that is arranged on the outer peripheral side of the rotor and has a stator core and a stator coil; The end plate includes a first coolant flow channel groove extending from the rotor shaft to the internal flow channel, and a second coolant flow channel extending from the internal flow channel to the outer peripheral side of the end plate. and a coolant channel groove.
According to this configuration, the coolant sent to the rotor shaft can be circulated to the outer peripheral side of the rotor via the first coolant channel groove, the internal channel, and the second coolant channel groove. , the rotor, the magnets of the rotor and the stator coils of the stator can be efficiently cooled. In addition, by providing the first coolant channel groove and the second coolant channel groove, a path for circulation from the center side of the rotor to the outer peripheral side is formed, so that the axial direction of the rotor shaft is aligned with the ground. Refrigerant can be circulated even when installed substantially vertically.
Furthermore, since the first end plate and the second end plate provided on both sides of the rotor are provided with the first coolant channel groove and the second coolant channel groove, respectively, the magnetic circuit of the rotor, stator, etc. is changed. It is not necessary, and deterioration of the characteristics of the magnetic circuit can be suppressed.

(Configuration 2)
2. The electric rotating machine according to claim 1, wherein the first coolant channel groove and the second coolant channel groove are provided at positions avoiding openings provided in the rotor. .
According to this configuration, when the coolant flows through the first coolant channel groove and the second coolant channel groove, leakage of the coolant from the opening can be suppressed.

(Composition 3)
3. The rotary electric machine according to claim 1, wherein the second coolant channel groove extends from the internal channel to the outer periphery of the end plate.
According to this configuration, the coolant is discharged in the centrifugal direction from the outer peripheral side of the rotor, so that the coolant can be efficiently circulated to the inside of the stator and stator coils.

(Composition 4)
4. The apparatus according to claim 2, wherein the first coolant channel groove or the second coolant channel groove is provided so as to be inclined with respect to a radial direction of the end plate. Rotating electric machine described.
According to this configuration, by slanting the first coolant channel groove and the second coolant channel groove, the resistance when the coolant flows is increased, and the flow velocity of the coolant is reduced. be able to. As a result, the residence time of the coolant becomes longer, and the cooling efficiency can be improved.

(Composition 5)
5. The rotary electric machine according to claim 4, wherein the inclination angles of the first coolant channel grooves or the second coolant channel grooves differ depending on locations.
With this configuration, it is possible to change the flow velocity of the coolant at any position on the first end plate or the second end plate.

(Composition 6)
6. The end plate according to any one of claims 1 to 5, wherein guide members are provided on both sides of the first coolant channel groove and the second coolant channel groove. or the rotary electric machine according to claim 1.
According to this configuration, when the coolant flows through the first coolant channel groove and the second coolant channel groove, the coolant is held by the guide member, so that the coolant flows through the first coolant channel. It is possible to suppress leakage from the groove for coolant and the groove for the second coolant flow path. Further, by engaging the guide member with the opening of the rotor, the rotor can be easily positioned with the first end plate and the second end plate, and the number of assembling man-hours can be simplified.

Reference Signs List 1 rotary electric machine 2 casing 10 motor 11 generator 20 rotor shaft 21 refrigerant flow path 22 circulation path 30 rotor 31 rotor core 32 internal flow path 32a opening 33 magnet 34 first end plate 35 second end plate 36 insertion hole 37 outlet 40 stator 41 Stator core 42 Stator coil 43 Discharge part 50 First coolant channel groove 51 Second coolant channel groove 52 Guide member 53 Tapered surface

Claims (6)

a rotor rotatably driven by a rotor shaft;
a stator disposed on the outer peripheral side of the rotor and having a stator core and a stator coil;
and end plates provided on both sides of the rotor,
The rotor has an internal flow path communicating in the axial direction,
the end plate includes a first coolant channel groove extending from the rotor shaft to the internal channel;
a second coolant channel groove extending from the internal channel to the outer peripheral side of the end plate. 2. The electric rotating machine according to claim 1, wherein the first coolant channel groove and the second coolant channel groove are provided at positions avoiding openings provided in the rotor. . 3. The rotary electric machine according to claim 1, wherein the second coolant channel groove extends from the internal channel to the outer periphery of the end plate. 4. The apparatus according to claim 2, wherein the first coolant channel groove or the second coolant channel groove is provided so as to be inclined with respect to a radial direction of the end plate. Rotating electric machine described. 5. The rotary electric machine according to claim 4, wherein the inclination angles of the first coolant channel grooves or the second coolant channel grooves differ depending on locations. 6. The end plate according to any one of claims 1 to 5, wherein guide members are provided on both sides of the first coolant channel groove and the second coolant channel groove. or the rotary electric machine according to claim 1.

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