WO2023108414A1

WO2023108414A1 - Motor rotor and motor

Info

Publication number: WO2023108414A1
Application number: PCT/CN2021/137884
Authority: WO
Inventors: 刘磊; 欧阳鹏; 宋志强
Original assignee: 舍弗勒技术股份两合公司; 刘磊
Priority date: 2021-12-14
Filing date: 2021-12-14
Publication date: 2023-06-22

Abstract

A motor rotor and a motor. The motor rotor comprises: a rotor shaft (1) provided with a central hole (12) for passage of a cooling medium; and a rotor main body (2) in torsion-resistant connection with the rotor shaft (1), a first cooling flow channel (2A) and a second cooling flow channel (2B) being formed inside the rotor main body (2), and the first cooling flow channel (2A) and the second cooling flow channel (2B) substantially extending in an axial direction (A) of the motor rotor. The upstream side of the first cooling flow channel (2A) and the downstream side of the second cooling flow channel (2B) are on the same side in the axial direction (A) of the motor rotor, while the downstream side of the first cooling flow channel (2A) and the upstream side of the second cooling flow channel (2B) are also on the same side in the axial direction (A) of the motor rotor. This arrangement allows flowing directions of the cooling medium in the first cooling flow channel (2A) and in the second cooling flow channel (2B) to be opposite to each other.

Description

Motor rotors and motors

technical field

The invention relates to the field of motors, in particular to a motor rotor and a motor.

Background technique

The motor can be used as the power device of pure electric vehicles or hybrid vehicles. In one possible cooling method of the motor, the cooling oil as the cooling medium is pumped into the hollow rotor shaft through the pump, and the cooling oil passes through the oil hole on the rotor shaft. Outflow to the balance plate and stator windings to cool the motor. In this cooling method, the cooling oil can directly contact the rotor shaft and the balance plate, but it is difficult for the cooling oil to contact the rotor body, and the heat of the rotor body can only be taken away indirectly through the rotor shaft and the balance plate, so the cooling effect is limited.

Contents of the invention

The purpose of the present invention is to overcome or at least alleviate the shortcomings of the above-mentioned prior art, and to provide a motor rotor and a motor with better cooling effect.

The invention provides a motor rotor, comprising:

a rotor shaft provided with a central hole through which a cooling medium passes; and

A rotor main body, the rotor main body is connected to the rotor shaft in a torsion-resistant manner, a first cooling flow channel and a second cooling flow channel are formed inside the rotor main body, and the first cooling flow channel and the second cooling flow channel The flow passage extends along the axial direction of the motor rotor as a whole, and the upstream side of the first cooling flow passage and the upstream side of the second cooling flow passage communicate with the central hole,

Wherein, the upstream side of the first cooling channel and the downstream side of the second cooling channel are located on the same side in the axial direction of the motor rotor, and the downstream side of the first cooling channel is connected to the second cooling channel. The upstream sides of the two cooling channels are located on the same axial side of the motor rotor, so that the cooling medium flows in opposite directions in the first cooling channel and the second cooling channel.

In at least one embodiment, there are multiple first cooling channels and the second cooling channels, and the first cooling channel and the second cooling channel are arranged around the periphery of the motor rotor. Alternate settings up.

In at least one embodiment, the motor rotor further includes two balance disks, two balance disks are located at the two ends of the rotor body in the axial direction, and the first cooling channel and the second cooling channel is located between the two balance plates.

In at least one embodiment, the balance disc includes a first balance disc and a second balance disc,

The end surface of the first balance plate facing the rotor main body is provided with a first concave portion, and the first concave portion communicates with the upstream side of the first cooling channel,

The end surface of the second balance plate facing the rotor main body is provided with a second concave portion, and the second concave portion communicates with the upstream side of the second cooling channel.

In at least one embodiment, projected along the axial direction of the balance disc, the projected areas of the first recess and the second recess account for 30% to 80% of the balance disc.

In at least one embodiment, the rotor shaft is provided with a first hole and a second hole, the second hole is located downstream of the first hole in the flow direction of the cooling medium in the central hole side,

The first hole communicates with the first cooling channel through the first depression, and the second hole communicates with the second cooling channel through the second depression.

In at least one embodiment, the first balance disk is provided with a first discharge hole, the second balance disk is provided with a second discharge hole, and the first discharge hole is connected to the downstream side of the second cooling channel. The second discharge hole communicates with the downstream side of the first cooling channel.

In at least one embodiment, the first discharge hole is not connected to the first recess, and the second discharge hole is not connected to the second recess.

In at least one embodiment, the central hole is a blind hole.

The present invention also proposes a motor, including a stator and the motor rotor described in any one of the above technical solutions.

By adopting the above technical solution, the cooling medium can pass through the rotor of the motor oppositely and alternately, thereby cooling the rotor of the motor.

Description of drawings

Fig. 1 shows a schematic structural diagram of a rotor of a motor according to an embodiment of the present invention.

Fig. 2 shows a cross-sectional view of a rotor of an electric machine according to an embodiment of the present invention.

Fig. 3 shows a schematic structural diagram of a rotor shaft of an electric motor according to an embodiment of the present invention.

Fig. 4 shows a schematic structural diagram of a balance plate of a motor according to an embodiment of the present invention.

Fig. 5 shows a schematic structural view of a rotor lamination of an electric machine according to an embodiment of the present invention.

FIG. 6 is a schematic diagram illustrating flow of a cooling medium in a rotor of an electric machine according to an embodiment of the present invention.

Detailed ways

Exemplary embodiments of the present invention are described below with reference to the accompanying drawings.

In the following description, unless otherwise stated, the axial direction A represents the axial direction of the motor, which is consistent with the axial direction of the rotor 100 of the motor; the circumferential direction C represents the circumferential direction of the motor, and the circumferential direction C is consistent with the rotor 100 of the motor. 100 circumferentially consistent.

Referring to FIGS. 1 to 6 , the present invention provides a motor, which includes a stator and a rotor 100 , and the stator may be located radially outside of the rotor 100 . The stator includes stator windings, and the axial ends of the stator windings may partially protrude from the end surface of the balance disk 3 of the rotor 100 .

The rotor 100 includes a rotor shaft 1, a rotor main body 2 and a balance disc 3. The rotor main body 2 may be cylindrical, and the balance disc 3 may be disc-shaped. Both the rotor main body 2 and the balance disc 3 are provided with a central hole, and the rotor shaft 1 passes through The rotor main body 2 and the balancing disk 3 are connected to the rotor shaft 1 in a rotationally fixed manner via the rotor main body 2 and the balancing disk 3 .

Two balance discs 3 may be provided, and the rotor main body 2 is sandwiched between the two balance discs 3 .

As shown in FIGS. 1 to 3 , the rotor shaft 1 can be cylindrical with a central hole 12 , and a cooling medium can pass through the central hole 12 into the interior of the rotor shaft 1 . A partition 13 is arranged in the center hole 12 , the center hole 12 is a blind hole, and the partition 13 is the bottom surface of the center hole 12 .

The rotor shaft 1 is provided with a first hole 11A and a second hole 11B penetrating through the cylinder wall, and both the first hole 11A and the second hole 11B communicate with the central hole 12 . The partition plate 13 is located on the axial side of the first hole 11A and the second hole 11B. Referring to FIG. 13 on the same side. The first hole 11A and the second hole 11B are separated by a certain distance in the axial direction A of the rotor shaft 1, and in the axial direction A of the rotor shaft 1, the positions of the first hole 11A and the second hole 11B are respectively the same as the two The positions of the balance discs 3 coincide. The second hole 11B may be located on the downstream side of the first hole 11A in the direction in which the cooling medium flows along the axial direction A of the center hole 12 .

A plurality of first holes 11A and second holes 11B may be provided along the circumferential direction C of the rotor shaft 1 , so that the cooling medium flows out from the central hole 12 through the plurality of first holes 11A and second holes 11B.

As shown in FIG. 1 and FIG. 2 , the balance plate 3 includes a first balance plate 301 and a second balance plate 302 , and the first balance plate 301 and the second balance plate 302 are respectively arranged at two axial ends of the rotor body 2 .

As shown in FIG. 2 and FIG. 4 , the side of the first balance plate 301 facing the rotor main body 2 is provided with a first concave portion 31A. The first balance plate 301 is attached to the rotor main body 2 , and an accommodation chamber is formed between the first recessed portion 31A and the end surface of the rotor main body 2 , and the accommodation chamber is used for accommodating a cooling medium.

The first balance plate 301 is provided with a first discharge hole 32B penetrating along its axial direction, and a plurality of first discharge holes 32B may be provided along the circumferential direction C of the first balance plate 301 . The first discharge hole 32B is located radially outside of the first recessed portion 31A, and the first discharge hole 32B and the first recessed portion 31A are separated, non-overlapping, and non-communicating. The cooling medium can be discharged from the rotor 100 through the first discharge hole 32B, and then can flow through the axial ends of the stator windings to cool the stator windings.

The side of the second balance plate 302 facing the rotor main body 2 is provided with a second concave portion 31B. The second balance plate 302 is attached to the rotor main body 2 , and an accommodation cavity is formed between the second recessed portion 31B and the end surface of the rotor main body 2 , and the accommodation cavity is used for accommodating a cooling medium.

The second balance plate 302 is provided with a second discharge hole 32A penetrating along its axial direction, and a plurality of second discharge holes 32A may be provided along the circumferential direction C of the second balance plate 302 . The second discharge hole 32A is located radially outside of the second recessed portion 31B, and the second discharge hole 32A and the second recessed portion 31B are separated, non-overlapping, and non-communicating. The cooling medium can be discharged from the rotor 100 through the second discharge hole 32A, and then can flow through the axial ends of the stator windings to cool the stator windings.

As shown in Figure 4, the first recessed portion 31A can cover a large area of the end surface of the first balance plate 301, for example, along the axial projection of the first balance plate 301, the projected area of the first recessed portion 31A occupies 30% of the first balance plate. 30% to 80% of 301, so that the cooling medium has a better cooling effect on the balance disk 3. The first concave portion 31A may be in a closed ring shape, and the central hole of the first balance plate 301 is connected to the first concave portion 31A. For example, the outline of the first recessed portion 31A may be approximately rectangular, and in order to avoid the first discharge hole 32B, the sides of the rectangular recess may be recessed. The cooling medium flowing in the first recessed portion 31A can cool the balance plate and the stator main body 2 . The first balance plate 301 and the second balance plate 302 have the same structure, but different installation positions and angles. Designing and processing one balance plate can be used as the first balance plate 301 and the second balance plate 302 at the same time, which can save production costs. The second recessed portion 31B and the second discharge hole 32A will not be described in detail.

As shown in FIG. 2 and FIG. 5 , the rotor main body 2 may include several disk-shaped rotor laminations 21 , and the rotor laminations 21 are stacked together to form a cylindrical shape. The rotor laminations 21 are provided with through holes penetrating along the axial direction A thereof, and a plurality of rotor laminations 21 are stacked together so that the plurality of through holes communicate to form a cooling channel. The cooling channels include a first cooling channel 2A and a second cooling channel 2B, the first cooling channel 2A and the second cooling channel 2B are provided with multiple and the same number, for example, the first cooling channel 2A and the second cooling channel 2B Four cooling channels 2B are provided. The first cooling channels 2A and the second cooling channels 2B are arranged alternately in the circumferential direction C of the rotor main body 2, and the second cooling channels 2B are arranged between two adjacent first cooling channels 2A. A first cooling channel 2A is provided between adjacent second cooling channels 2B. The first cooling channel 2A and the second cooling channel 2B extend along the axial direction A as a whole.

It can be understood that the through holes of adjacent rotor laminations 21 do not need to be completely aligned, and can also be staggered by a certain distance, as long as they can be partially opposed to form a through cooling channel.

The upstream end of the first cooling channel 2A communicates with the central hole 12 through the first recess 31A, and the downstream end of the first cooling channel 2A communicates with the second discharge hole 32A. The upstream end of the second cooling channel 2B communicates with the central hole 12 through the second recess 31B, and the downstream end of the second cooling channel 2B communicates with the first discharge hole 32B.

In other possible implementations, the rotor main body may be provided with a flow channel extending radially thereof, the first hole and the second hole may be aligned with the flow channel, so that the central hole communicates with the cooling flow channel in the rotor main body, and the cooling The medium flows radially outward in the rotor and then enters the first cooling channel and the second cooling channel.

The upstream side of the first cooling channel 2A (the left side in FIG. 2 and FIG. 6 ) and the downstream side of the second cooling channel 2B are located on the same side in the axial direction A of the rotor body 2 (one side in the axial direction of the rotor body 2 ). end), the downstream side of the first cooling channel 2A (the right side of FIG. 2 and FIG. 6 ) and the upstream side of the second cooling channel 2B are located on the same side in the axial direction A of the rotor main body 2 (the rotor main body 2 The other end of the axial direction), so that the flow direction of the cooling medium in the first cooling channel 2A and the second cooling channel 2B is opposite. By passing the cooling medium oppositely and alternately through the motor rotor, the cooling medium can effectively cool the motor rotor.

More specifically, compared with the cooling medium entering the rotor from one axial side of the rotor and flowing out of the rotor from the other axial side of the rotor, in the present invention, the cooling medium flows into the cooling flow in the rotor main body from both axial ends of the rotor The channel flows out from the axial ends of the rotor and flows to the stator coils, etc. Therefore, in the present invention, the cooling of the axial ends of the rotor and stator coils is more consistent, and sufficient and effective cooling can be realized.

Referring to FIG. 2 and FIG. 6 , the flow direction of the cooling medium in the rotor 100 is introduced. In Fig. 6, the passages or holes through which the cooling medium flows are represented materially. The arrows in Fig. 2 and Fig. 6 indicate the flow direction of the cooling medium, and the cooling medium may be oil.

The cooling medium flows along the axial direction of the central hole 12 under the action of the pump, and is divided into two branches through the first hole 11A and the second hole 11B. The cooling medium passing through the first hole 11A enters the first concave portion 31A, and the cooling medium in the first concave portion 31A can cool the first balance plate 301 . Then the cooling medium enters the rotor main body 2 along the first cooling flow channel 2A to cool the rotor main body 2, and finally the cooling medium is discharged from the second discharge hole 32A, and the discharged cooling medium can flow to the end of the stator winding to cool the stator winding. cool down.

The cooling medium passing through the second hole 11B enters the second concave portion 31B, and the cooling medium in the second concave portion 31B can cool the second balance disk 302 . Then the cooling medium enters the rotor main body 2 along the second cooling channel 2B to cool the rotor main body 2 . The flow direction of the cooling medium in the second cooling channel 2B is opposite to that of the cooling medium in the first cooling channel 2A. Finally, the cooling medium is discharged from the first discharge hole 32B, and the discharged cooling medium can flow to the end of the stator winding to cool the stator winding.

Although the present invention has been described in detail using the above-mentioned embodiments, it is obvious to those skilled in the art that the present invention is not limited to the embodiments described in this specification. The present invention can be modified and implemented as modified embodiments without departing from the spirit and scope of the present invention defined by the claims. Therefore, the description in this specification is for the purpose of illustration and does not have any restrictive meaning to the present invention.

List of reference signs

100 rotor

1 rotor shaft 11A first hole 11B second hole 12 central hole 13 partition

2 rotor laminations 2A first cooling channel 2B second cooling channel

3 balance plate 301 first balance plate 31A first depression 32B first discharge hole 302 second balance plate 31B second depression 32A second discharge hole

A Axial C Circumferential

Claims

A motor rotor, characterized in that it comprises:

a rotor shaft (1) provided with a central hole (12) through which a cooling medium passes; and

The rotor main body (2), the rotor main body (2) is connected to the rotor shaft (1) in a torsion-resistant manner, and the inside of the rotor main body (2) is formed with a first cooling channel (2A) and a second cooling flow channel channel (2B), the first cooling channel (2A) and the second cooling channel (2B) extend along the axial direction (A) of the motor rotor as a whole, and the first cooling channel (2A ) and the upstream side of the second cooling channel (2B) are in communication with the center hole (12),

Wherein, the upstream side of the first cooling channel (2A) and the downstream side of the second cooling channel (2B) are located on the same side in the axial direction (A) of the motor rotor (2), the The downstream side of the first cooling channel (2A) and the upstream side of the second cooling channel (2B) are located on the same side in the axial direction (A) of the motor rotor (2), so that the cooling medium is Flow directions in the first cooling channel (2A) and in the second cooling channel (2B) are opposite.
The motor rotor according to claim 1, characterized in that there are multiple first cooling channels (2A) and second cooling channels (2B), and the first cooling channels (2A ) and the second cooling channels (2B) are arranged alternately in the circumferential direction (C) of the motor rotor.
The motor rotor according to claim 1, characterized in that, the motor rotor also includes a balance disc (3), and two balance discs (3) are provided, and the two balance discs (3) are respectively located at the The two axial ends of the rotor main body (2), the first cooling channel (2A) and the second cooling channel (2B) are located between the two balance plates (3).
The motor rotor according to claim 3, characterized in that, the balance disc (3) comprises a first balance disc (301) and a second balance disc (302),

The end surface of the first balance plate (301) facing the rotor main body (2) is provided with a first concave portion (31A), and the first concave portion (31A) and the first cooling channel (2A) The upstream side of the connection,

The end surface of the second balance plate (302) facing the rotor main body (2) is provided with a second recessed part (31B), and the second recessed part (31B) and the second cooling channel (2B) connected to the upstream side.
The motor rotor according to claim 4, characterized in that, along the axial projection of the balance plate (3), the projected area of the first recess (31A) and the second recess (31B) occupies 30% to 80% of the balance disc (3).
The motor rotor according to claim 4, characterized in that, the rotor shaft (1) is provided with a first hole (11A) and a second hole (11B), and the cooling medium passes through the central hole (12) In the direction of flow, the second hole (11B) is located on the downstream side of the first hole (11A),

The first hole (11A) communicates with the first cooling channel (2A) through the first depression (31A), and the second hole (11B) communicates with the second depression (31B) and The second cooling channel (2B) is connected.
The motor rotor according to claim 4, characterized in that, the first balance disk (301) is provided with a first discharge hole (32B), and the second balance disk (302) is provided with a second discharge hole (32A) ), the first discharge hole (32B) communicates with the downstream side of the second cooling channel (2B), and the second discharge hole (32A) communicates with the downstream side of the first cooling channel (2A) connected.
The motor rotor according to claim 7, characterized in that, the first discharge hole (32B) does not communicate with the first recess (31A), and the second discharge hole (32A) communicates with the second The depression (31B) is not connected.
The motor rotor according to claim 1, characterized in that, the central hole (12) is a blind hole.
A motor, characterized by comprising a stator and the motor rotor according to any one of claims 1-9.