CN220874289U - Rotor assembly, motor and vehicle - Google Patents

Abstract

The present disclosure relates to a rotor assembly, a motor and a vehicle, wherein the rotor assembly comprises a rotating shaft, a rotor core, a first balance disc and a second balance disc, and the rotating shaft is provided with a liquid inlet channel for a cooling medium to enter; the rotor core is sleeved on the rotating shaft and is provided with a first core channel, a second core channel and a third core channel which are communicated along the axial direction of the rotor core; the first balance disc is provided with a liquid inlet groove and a first communication groove, the notch of the liquid inlet groove faces the rotor iron core, the liquid inlet channel and the first iron core channel are communicated with the liquid inlet groove, and the second iron core channel and the third iron core channel are communicated with the first communication groove; the second balance disc is provided with a second communication groove with a notch facing the rotor core, and the first core channel and the second core channel are communicated with the second communication groove; the first balance disc and/or the second balance disc is/are provided with a liquid outlet hole for the cooling medium to flow out, and the liquid outlet hole is communicated with the third iron core channel. The rotor assembly can effectively improve the reliability, stability and efficiency of the motor.

Description

Rotor assembly, motor and vehicle

Technical Field

The present disclosure relates to the field of motor technologies, and in particular, to a rotor assembly, a motor, and a vehicle.

Background

Along with the continuous development of new energy automobiles and the gradual improvement of the driving capability requirements of the market on the new energy automobiles, the motor of the new energy automobiles is required to continuously improve the rotating speed, the torque density and the power density on the premise that the volume of the motor is gradually compressed. The higher the rotational speed, torque density and power density of the motor, the higher the heat generated by the motor, and therefore, the heat dissipation and cooling structure of the motor is essential for reliable, stable and efficient operation of the motor.

At present, the cooling of the motor can be divided into air cooling, water cooling and oil cooling, and the oil cooling mode is the first choice by virtue of natural electrical insulation, high freedom degree of structural design and the like. In the related art, most of motors of new energy automobiles are permanent magnet synchronous motors, when the motors run in a high-speed area, the heat of rotors of the motors is increased rapidly, and when the motors are severe, magnetic steel demagnetizes possibly, and finally, the motors are subjected to power attenuation or power loss. Therefore, if the rotor of the motor cannot be effectively cooled, the reliability, stability and efficiency of the motor operation are low.

Disclosure of utility model

The present disclosure aims to solve, at least to some extent, one of the technical problems in the related art.

To this end, the present disclosure proposes a rotor assembly to improve the heat dissipation efficiency of a rotor.

The rotor assembly comprises a rotating shaft, a rotor iron core, a first balance disc and a second balance disc, wherein the rotating shaft is provided with a liquid inlet channel for cooling medium to enter; the rotor core is sleeved on the rotating shaft and is provided with a first core channel, a second core channel and a third core channel which are communicated with each other along the axial direction of the rotor core; the first balance disc is sleeved on the rotating shaft and arranged on one axial side of the rotor core, the first balance disc is provided with a liquid inlet groove and a first communication groove, a notch faces the rotor core, the liquid inlet channel and the first core channel are communicated with the liquid inlet groove, and the second core channel and the third core channel are communicated with the first communication groove; the second balance disc is sleeved on the rotating shaft and arranged on the other axial side of the rotor core, the second balance disc is provided with a second communication groove with a notch facing the rotor core, and the first core channel and the second core channel are both communicated with the second communication groove; the first balance disc and/or the second balance disc is/are provided with a liquid outlet hole for the cooling medium to flow out, and the liquid outlet hole is communicated with the third iron core channel. .

Optionally, each of the first communication groove and the second communication groove extends in a circumferential direction of the rotor core; the first core channel, the second core channel and the third core channel are arranged at intervals along the circumferential direction of the rotor core.

Optionally, the rotor core includes a first end face and a second end face that are oppositely arranged along an axial direction thereof; a part of the projection of the first communication groove on the second end face is overlapped with at least a part of a port of the second iron core channel on the second end face, another part of the projection of the first communication groove on the first end face is overlapped with at least a part of a port of the first iron core channel on the first end face, and another part of the projection of the first communication groove on the second end face is overlapped with at least a part of a port of the second iron core channel on the first end face.

Optionally, the first communication groove is in a circular arc shape or a wave shape extending along the circumferential direction of the rotor core; and/or, the second communication groove is in a circular arc shape or wave shape extending along the circumferential direction of the rotor core.

Optionally, the liquid inlet groove and the first communication groove are arranged at intervals along the circumferential direction of the rotor core; the liquid outlet holes are formed in the second balance disc, and the second communication grooves and the liquid outlet holes are arranged at intervals along the circumferential direction of the rotor core.

Optionally, the rotor core includes a first end face and a second end face that are oppositely arranged along an axial direction thereof; at least a portion of the projection of the liquid inlet groove on the first end face coincides with at least a portion of the port of the first iron core channel on the first end face, and/or at least a portion of the projection of the liquid outlet hole on the second end face of the rotor iron core coincides with at least a portion of the port of the third iron core channel on the second end face.

Optionally, the rotor core is provided with a fourth core channel which is penetrated along the axial direction of the rotor core, the second balance disc is provided with a third communication groove with a notch facing the rotor core, the third core channel and the fourth core channel are both communicated with the third communication groove, the liquid outlet is formed in the first balance disc, and the liquid outlet is communicated with the fourth core channel.

Optionally, at least a portion of the projection of the liquid inlet groove on the first end face coincides with at least a portion of the port of the first core channel on the first end face, and/or at least a portion of the projection of the liquid outlet hole on the second end face of the rotor core coincides with at least a portion of the port of the fourth core channel on the first end face.

Optionally, the number of the first core channel, the second core channel, the third core channel, the liquid inlet groove, the first communication groove, the second communication groove and the liquid outlet hole is multiple; the liquid inlet groove is in one-to-one correspondence with the second communication groove and the first iron core channel, the second iron core channel is in one-to-one correspondence with the first communication groove and the second communication groove, and the third iron core channel is in one-to-one correspondence with the first communication groove and the liquid outlet hole.

Optionally, the rotor core has a first lightening hole, a second lightening hole and a third lightening hole penetrating along an axial direction thereof, the first lightening hole forming the first core channel, the second lightening hole forming the second core channel, the third lightening hole forming the third core channel; and/or at least one of the rotor core, the first balancing disk, and the second balancing disk is arranged symmetrically with respect to a radial direction of the rotor core.

The present disclosure also provides a motor.

The motor of the present disclosure includes a rotor assembly as described in any of the above.

The present disclosure also provides a vehicle.

The vehicle of the present disclosure includes an electric machine as claimed in any one of the above.

When the rotor assembly disclosed by the disclosure operates, after a cooling medium enters the rotor assembly through the liquid inlet channel, the cooling medium flows into a first iron core channel of a rotor iron core through a liquid inlet groove of a first balance disc; then, flowing along the first core channel into the second communication slot of the second balance disc; then, the air flows into a second iron core channel of the rotor iron core through a second communication groove; then, the first iron core flows into the first communication groove of the first balance disc along the second iron core channel; then, the fluid flows into the third core channel of the rotor core through the first communication slot, and finally flows along the third core channel and flows out through the liquid outlet hole. Therefore, the cooling medium is used for absorbing heat generated during operation of the rotor assembly and carrying the heat generated during operation of the rotor assembly out of the rotor assembly, so that heat dissipation of the rotor assembly is realized. When the rotor assembly is used as a rotor assembly of the motor, the reliability, stability and efficiency of the motor can be effectively improved.

Drawings

FIG. 1 is a schematic structural view of a rotor assembly of one embodiment of the present disclosure.

FIG. 2 is a structural cross-sectional view of a rotor assembly of one embodiment of the present disclosure.

Fig. 3 is a schematic structural view of the rotor core of fig. 1.

Fig. 4 is a schematic structural view of the first balance disc of fig. 1.

Fig. 5 is a schematic structural view of the second balance disc of fig. 1.

Fig. 6 is a flow path diagram of the cooling medium of the rotor assembly of fig. 2.

Fig. 7 is a schematic structural view of a first balance disc of a rotor assembly according to another embodiment of the present disclosure.

Fig. 8 is a schematic structural view of a second balance disc of a rotor assembly according to another embodiment of the present disclosure.

FIG. 9 is a flow path diagram of a cooling medium of a rotor assembly according to another embodiment of the present disclosure.

Reference numerals:

100. a rotor assembly;

1. A rotating shaft; 11. a liquid inlet channel; 111. an axial section; 112. a radial segment; 113. a liquid inlet;

2. A rotor core; 21. a first core channel; 22. a second core channel; 23. a third core channel; 25. a fifth core channel; 26. a sixth core channel; 24. a fourth core channel; 27. a first lightening hole; 28. a second lightening hole; 29. a third lightening hole; 210. magnetic steel; 201. a first end face; 202. a second end face;

3. A first balance plate; 31. a liquid inlet tank; 32. a first communication groove; 33. a fourth communication groove; 34. a liquid outlet hole;

4. A second balance plate; 41. a second communication groove; 42. a third communication groove; 43. and a fifth communication groove.

Detailed Description

Embodiments of the present disclosure, examples of which are illustrated in the accompanying drawings, are described in detail below. The embodiments described below by referring to the drawings are exemplary and intended for the purpose of explaining the present disclosure and are not to be construed as limiting the present disclosure.

As shown in fig. 1 to 9, a rotor assembly 100 of the embodiment of the present disclosure includes a rotating shaft 1, a rotor core 2, a first balance disc 3 and a second balance disc 4, the rotor core 2 is sleeved on the rotating shaft 1, the first balance disc 3 is sleeved on the rotating shaft 1 and is arranged on one axial side of the rotor core 2, and the second balance disc 4 is sleeved on the rotating shaft 1 and is arranged on the other axial side of the rotor core 2. The rotary shaft 1 is provided with a liquid inlet channel 11 for the entry of cooling medium, the first balance disc 3 is provided with a liquid inlet groove 31 and a first communication groove 32 with notches facing the rotor core 2, the rotor core 2 is provided with a first core channel 21, a second core channel 22 and a third core channel 23 which are penetrated along the axial direction of the rotor core 2, and the second balance disc 4 is provided with a second communication groove 41 with notches facing the rotor core 2. Wherein, the liquid inlet channel 11 and the first iron core channel 21 are communicated with the liquid inlet groove 31, and the second iron core channel 22 and the third iron core channel 23 are communicated with the first communication groove 32; the first core passage 21 and the second core passage 22 are each in communication with the second communication groove 41. At least one of the first balance plate 3 and the second balance plate 4 is provided with a liquid outlet hole 34 through which the cooling medium flows out, and the liquid outlet hole 34 communicates with the third core passage 23. Wherein the cooling medium may be a cooling oil.

As shown in fig. 2, 6 and 9, when the rotor assembly 100 according to the embodiment of the present disclosure is operated, after the cooling medium enters the rotor assembly 100 through the liquid inlet channel 11, the cooling medium flows into the first core channel 21 of the rotor core 2 through the liquid inlet channel 31 of the first balance disc 3; then, in the second communication groove 41 of the second balance disk 4, to which the first core passage 21 flows; then, flows into the second core passage 22 of the rotor core 2 through the second communication groove 41; then, flows into the first communication groove 32 of the first balance disc 3 along the second core passage 22; subsequently, flows into the third core passage 23 of the rotor core 2 through the first communication groove 32, and finally flows along the third core passage 23 and flows out through the liquid outlet hole 34. Thereby, the cooling medium absorbs heat generated during operation of the rotor assembly 100, and brings the heat generated during operation of the rotor assembly 100 out of the rotor assembly 100, thereby realizing heat dissipation of the rotor assembly 100. When the rotor assembly 100 is used as a rotor assembly of a motor, reliability, stability, and efficiency of the motor can be effectively improved.

In order to make the technical solution of the present disclosure easier to understand, the technical solution of the present disclosure will be further described below by taking an example in which the axial direction of the rotating shaft 1 coincides with the left-right direction. The left-right direction is shown in fig. 1 and 2.

For example, as shown in fig. 1 and 2, the first balance disc 3 is provided on the left side of the rotor core 2, and the second balance disc 4 is provided on the right side of the rotor core 2. Firstly, a cooling medium enters a liquid inlet groove 31 of the first balance disc 3 through a liquid inlet channel 11; then, flows from left to right along the first core passage 21 of the rotor core 2 into the second communication groove 41 of the second balance plate 4; then, flows into the second core passage 22 of the rotor core 2 through the second communication groove 41; then, flows from right to left along the second core passage 22 into the first communication groove 32 of the first balance disc 3; subsequently, flows into the third core passage 23 of the rotor core 2 via the first communication groove 32; finally, flows from left to right along the third core passage 23 and flows out through the liquid outlet hole 34.

In some embodiments, as shown in fig. 2, the liquid inlet channel 11 includes an axial section 111 and a radial section 112, the axial section 111 extends along the axial direction of the rotating shaft 1, and at least one end of the axial section 111 penetrates through the rotating shaft 1 to form a liquid inlet 113 at the end of the rotating shaft 1. The radial segment 112 extends in the radial direction of the rotary shaft 1, one end of the radial segment 112 extends to the axial segment 111 to communicate with the axial segment 111, and the other end of the radial segment 112 penetrates the outer circumferential surface of the rotary shaft 1.

For example, as shown in fig. 2, the axial section 111 extends in the left-right direction, the right end of the axial section 111 penetrates the rotary shaft 1, and the port of the axial section 111 at the right end of the rotary shaft 1 forms the liquid inlet 113. The inner end of the radial segment 112 extends to the axial segment 111, and the outer end of the radial segment 112 penetrates the outer circumferential surface of the rotating shaft 1. Wherein, inwardly can be understood as: a direction approaching the axis of the rotating shaft 1 on a plane perpendicular to the rotating shaft 1; outward can be understood as: in a direction away from the axis of the rotating shaft 1 in a plane perpendicular to the rotating shaft 1. The inner end of the radial segment 112 is disposed closer to the axis of the shaft 1 than the outer end of the radial segment 112.

The cooling medium can thus flow into the axial section 111 via the inlet 113, after which the cooling medium flows along the axial section 111 into the radial section 112 and through the radial section 112 into the liquid inlet slot 31 of the first balancing disk 3.

Preferably, the axial section 111 is arranged coaxially with the rotation shaft 1.

Alternatively, as shown in FIG. 2, the liquid inlet slot 31 is disposed in correspondence with the radial segment 112. The liquid inlet groove 31 extends along the radial direction of the rotating shaft 1, and one end of the liquid inlet groove 31 penetrates through the inner circumferential surface of the first balance disc 3.

For example, as shown in fig. 2, the liquid inlet groove 31 is disposed in alignment with the radial segment 112, and the inner end of the liquid inlet groove 31 penetrates the inner peripheral surface of the first balance disc 3. It will be appreciated that the inner peripheral surface of the first balance disc 3 is in abutment with the outer peripheral surface of the spindle 1. In the case that the liquid inlet groove 31 is disposed corresponding to the radial segment 112, one end of the liquid inlet groove 31 penetrates through the inner circumferential surface of the first balance disc 3, and one end of the radial segment 112 penetrates through the outer circumferential surface of the rotating shaft 1, the liquid inlet groove 31 may be directly communicated with the radial segment 112, that is, the liquid inlet groove 31 is directly communicated with the liquid inlet channel 11.

Therefore, the liquid inlet groove 31 and the liquid inlet channel 11 can be communicated without arranging other communication components, which is beneficial to simplifying the structure of the rotor assembly 100 and further facilitating the processing and manufacturing of the rotor assembly 100.

Alternatively, as shown in fig. 4, 6, 7 and 9, the liquid inlet groove 31 is a linear groove extending in the radial direction of the rotating shaft 1.

By providing the liquid inlet groove 31 as a straight groove, the processing and manufacturing of the liquid inlet groove 31 are facilitated, thereby further facilitating the processing and manufacturing of the rotor assembly 100.

In some embodiments, as shown in fig. 3 to 9, the first communication groove 32 and the second communication groove 41 each extend in the circumferential direction of the rotor core 2. The first core passage 21, the second core passage 22, and the third core passage 23 are arranged at intervals in the circumferential direction of the rotor core 2.

It will be appreciated that the circumferential dimension of the rotor core 2 is generally large, whereas in the radial direction of the rotor core 2, the area available for arranging the core passages is small due to the arrangement of the magnetic steel 210 and the like. The arrangement of the first core passage 21, the second core passage 22, and the third core passage 23 is facilitated by arranging the first core passage 21, the second core passage 22, and the third core passage 23 at intervals in the circumferential direction of the rotor core 2.

Alternatively, as shown in fig. 2, the rotor core 2 includes a first end face 201 and a second end face 202 that are oppositely arranged in the axial direction thereof. A part of the projection of the first communication groove 32 on the second end face 202 coincides with at least a part of the port of the second core passage 22 on the second end face 202, another part coincides with at least a part of the port of the third core passage 23 on the second end face 202, a part of the projection of the second communication groove 41 on the first end face 201 coincides with at least a part of the port of the first core passage 21 on the first end face 201, and another part coincides with at least a part of the port of the second core passage 22 on the first end face 201.

For example, the first end surface 201 is a left end surface of the rotor core 2, and the second end surface 202 is a right end surface of the rotor core 2. The first core passage 21 forms a left port on the left end face of the rotor core 2 and a right port on the right end face of the rotor core 2; the second core passage 22 forms a left port on the left end face of the rotor core 2 and a right port on the right end face of the rotor core 2; the third core passage 23 forms a left port at the left end face of the rotor core 2 and a right port at the right end face of the rotor core 2. A part of the projection of the first communication groove 32 on the right end surface of the rotor core 2 coincides with the right port of the second core passage 22, and a part of the projection of the first communication groove 32 on the right end surface of the rotor core 2 coincides with at least a part of the right port of the third core passage 23; a part of the projection of the second communication groove 41 on the left end surface of the rotor core 2 overlaps at least a part of the left port of the first core passage 21, and a part of the projection of the second communication groove 41 on the left end surface of the rotor core 2 overlaps a part of the left port of the second core passage 22.

Thereby, the first communication groove 32 is allowed to communicate directly with the second core passage 22 and the third core passage 23, and the second communication groove 41 is allowed to communicate directly with the first core passage 21 and the second core passage 22. The structure of the rotor assembly 100 is further simplified, and the processing and manufacturing of the rotor assembly 100 are further facilitated.

Alternatively, as shown in fig. 4 and 7, the first communication groove 32 has a circular arc shape or a wavy shape extending in the circumferential direction of the rotor core 2.

For example, as shown in fig. 4, the first communication groove 32 has a circular arc shape extending in the circumferential direction of the rotor core 2, and the first communication groove 32 is provided coaxially with the rotor core 2. As another example, as shown in fig. 7, the first communication groove 32 has a wavy shape extending in the circumferential direction of the rotor core 2.

By setting the first communicating groove 32 to the above-described shape, not only is the processing and manufacturing of the first balance disc 3 facilitated, but also the structural strength of the first balance disc 3 is facilitated to be ensured in the case where the first communicating groove 32 is provided.

Alternatively, the second communication groove 41 has a circular arc shape or a wave shape extending in the circumferential direction of the rotor core 2.

For example, as shown in fig. 5, the second communication groove 41 has a circular arc shape extending in the circumferential direction of the rotor core 2, and the second communication groove 41 is provided coaxially with the rotor core 2. As another example, as shown in fig. 8, the second communication groove 41 has a wavy shape extending in the circumferential direction of the rotor core 2.

By setting the second communication groove 41 to the above-described shape, not only is the processing and manufacturing of the second balance disk 4 facilitated, but also the structural strength of the second balance disk 4 is facilitated to be ensured in the case where the second communication groove 41 is provided.

Alternatively, the liquid inlet groove 31 and the first communication groove 32 are arranged at intervals along the circumferential direction of the rotor core 2. The liquid outlet holes 34 are provided in the second balance plate 4, and the second communication grooves 41 and the liquid outlet holes 34 are arranged at intervals along the circumferential direction of the rotor core 2.

In the case where the first core passage 21, the second core passage 22, and the third core passage 23 are arranged at intervals in the circumferential direction of the rotor core 2, by arranging the liquid inlet groove 31 and the first communication groove 32 at intervals in the circumferential direction of the rotor core 2, the second communication groove 41 and the liquid outlet hole 34 are arranged at intervals in the circumferential direction of the rotor core 2, the liquid inlet groove 31, the first communication groove 32, the second communication groove 41, and the liquid outlet hole 34 are facilitated to communicate with the corresponding core passages.

Optionally, at least a portion of the projection of the feed slot 31 at the first end face 201 coincides with at least a portion of the port of the first core passage 21 at the first end face 201.

For example, a part of the projection of the liquid inlet groove 31 on the left end surface of the rotor core 2 coincides with a part of the left port of the first core passage 21.

Therefore, the liquid inlet groove 31 can be directly communicated with the first iron core channel 21, which is beneficial to further simplifying the structure of the rotor assembly 100 and further facilitating the processing and manufacturing of the rotor assembly 100.

Optionally, at least a portion of the projection of the liquid outlet hole 34 at the second end face 202 of the rotor core 2 coincides with a portion of the port of the third core passage 23 at the second end face 202.

For example, the projection of the liquid outlet hole 34 on the right end surface of the rotor core 2 coincides with a part of the right port of the third core passage 23.

Therefore, the liquid outlet hole 34 can be directly communicated with the third iron core channel 23, which is beneficial to further simplifying the structure of the rotor assembly 100 and further facilitating the processing and manufacturing of the rotor assembly 100.

Alternatively, as shown in fig. 3 to 5, the number of the first core passage 21, the second core passage 22, the third core passage 23, the liquid inlet groove 31, the first communication groove 32, the second communication groove 41, and the liquid outlet hole 34 is plural. Wherein the liquid inlet groove 31, the second communication groove 41 and the first iron core channel 21 are in one-to-one correspondence; the second core passages 22, the first communication grooves 32 and the second communication grooves 41 are in one-to-one correspondence; the third core channel 23, the first communicating groove 32 and the liquid outlet hole 34 are in one-to-one correspondence.

For example, as shown in fig. 3 to 5, the number of the first core passage 21, the second core passage 22, the third core passage 23, the liquid inlet groove 31, the first communication groove 32, the second communication groove 41, and the liquid outlet hole 34 is two, and two cooling circuits are formed.

Thereby, the contact area between the rotor assembly 100 and the cooling medium can be increased, thereby being beneficial to further improving the heat dissipation effect of the rotor assembly 100.

Optionally, the number of the radial segments 112 is plural, the plural radial segments 112 are in one-to-one correspondence with the plural liquid inlets grooves 31, and each liquid inlet groove 31 is communicated with the corresponding radial segment 112.

Therefore, the same liquid inlet channel 11 can provide cooling medium for the plurality of cooling circuits, which is beneficial to further simplifying the structure of the rotor assembly 100 and further facilitating the processing and manufacturing of the rotor assembly 100.

In other embodiments, as shown in fig. 7 to 9, the liquid outlet hole 34 may also be provided on the first balance plate 3. At this time, the rotor core 2 is provided with a fourth core passage 24 penetrating in the axial direction thereof, the second balance disc 4 is provided with a third communication groove 42 having a notch facing the rotor core 2, the third core passage 23 and the fourth core passage 24 are both in communication with the third communication groove 42, and the liquid outlet hole 34 is in communication with the fourth core passage 24.

When the rotor assembly 100 operates, after the cooling medium enters the rotor assembly 100 through the liquid inlet channel 11, firstly, the cooling medium flows into the first iron core channel 21 of the rotor iron core 2 through the liquid inlet groove 31 of the first balance disc 3; then, in the second communication groove 41 of the second balance disk 4, to which the first core passage 21 flows; then, flows into the second core passage 22 of the rotor core 2 through the second communication groove 41; then, flows into the first communication groove 32 of the first balance disc 3 along the second core passage 22; subsequently, flows into the third core passage 23 of the rotor core 2 via the first communication groove 32; then, flows into the fourth core passage 24 of the rotor core 2 through the third communication groove 42; finally, flows along the fourth core passage 24 and exits through the exit orifice 34.

Optionally, at least a portion of the projection of the liquid outlet hole 34 at the second end face 202 of the rotor core 2 coincides with at least a portion of the port of the fourth core channel 24 at the first end face 201.

For example, the projection of the liquid outlet hole 34 on the left end surface of the rotor core 2 coincides with a part of the left port of the fourth core passage 24.

Therefore, the liquid outlet hole 34 can be directly communicated with the fourth iron core channel 24, which is beneficial to further simplifying the structure of the rotor assembly 100 and further facilitating the processing and manufacturing of the rotor assembly 100.

Alternatively, the rotor core 2 is provided with a fifth core passage 25 and a sixth core passage 26 penetrating in the axial direction thereof, the first balance disc 3 is provided with a fourth communication groove 33 having a notch facing the rotor core 2, and the second balance disc 4 is provided with a fifth communication groove 43 having a notch facing the rotor core 2. Wherein the third communication groove 42 communicates with the third core passage 23 and the fifth core passage 25, the fourth communication groove 33 communicates with the fifth core passage 25 and the sixth core passage 26, and the fifth communication groove 43 communicates with the sixth core passage 26 and the fourth core passage 24. At this time, the liquid outlet hole 34 communicates with the third core passage 23 of the fourth core passage 24 through the third communication groove 42, the fifth core passage 25, the fourth communication groove 33, the sixth core passage 26, the fifth communication groove 43.

As shown in fig. 9, when the rotor assembly 100 is in operation, the cooling medium flows into the third core passage 23 of the rotor core 2 through the first communication groove 32; first, flows into the fifth core passage 25 of the rotor core 2 through the third communication slot 42; then, flows into the sixth core passage 26 of the rotor core 2 through the fourth communication slot 33; then, flows into the fourth core passage 24 of the rotor core 2 through the fifth communication groove 43; finally, flows along the fourth core passage 24 and exits through the exit orifice 34.

Alternatively, the liquid outlet hole 34 is a circular hole penetrating in the axial direction of the rotor core 2.

Alternatively, at least one of the rotor core 2, the first balance disc 3, and the second balance disc 4 is arranged symmetrically with respect to the radial direction of the rotor core 2.

For example, as shown in fig. 3 to 5, the rotor cores 2 are symmetrically arranged with respect to the radial direction of the rotor cores 2, and the rotor cores 2 are arranged in a center symmetry. The first balance discs 3 are symmetrically arranged with respect to the radial direction of the rotor core 2, and the first balance discs 3 are arranged in a central symmetry. The second balance discs 4 are symmetrically arranged with respect to the radial direction of the rotor core 2, and the second balance discs 4 are arranged in a central symmetry.

By providing at least one of the rotor core 2, the first balance disc 3 and the second balance disc 4 as a radially symmetrical arrangement with respect to the rotor core 2, the manufacturing of the rotor assembly 100 is further facilitated.

Alternatively, the rotor core 2 has a first lightening hole 27, a second lightening hole 28 and a third lightening hole 29 penetrating in the axial direction thereof, the first lightening hole 27 forming the first core passage 21, the second lightening hole 28 forming the second core passage 22, and the third lightening hole 29 forming the third core passage 23.

That is, the first, second and third lightening holes 27, 28 and 29 serve to reduce the weight of the rotor core 2 and also serve as the first, second and third core passages 21, 22 and 23, respectively, which is advantageous in simplifying the structure of the rotor core 2, thereby further facilitating the manufacturing of the rotor assembly 100.

Alternatively, as shown in fig. 3, 6 and 9, the projections of the first weight-reducing holes 27, the second weight-reducing holes 28 and the third weight-reducing holes 29 in the axial direction of the rotor core 2 are isosceles trapezoids.

By setting the projections of the first lightening holes 27, the second lightening holes 28 and the third lightening holes 29 in the axial direction of the rotor core 2 as isosceles trapezoids, the areas of the hole walls of the first lightening holes 27, the second lightening holes 28 and the third lightening holes 29 close to the outer peripheral surface of the rotor core 2 are favorably increased, thereby being favorable for increasing the contact area of the cooling medium and the area close to the outer peripheral surface of the rotor core 2 and further being favorable for improving the heat dissipation effect of the rotor assembly 100.

In other embodiments, the projections of the first lightening holes 27, the second lightening holes 28 and the third lightening holes 29 in the axial direction of the rotor core 2 may be configured in other shapes such as triangle, semicircle, ellipse, etc. as required. Wherein the projected shapes of the first weight-reducing holes 27, the second weight-reducing holes 28, and the third weight-reducing holes 29 along the rotor core 2 should be designed according to the following conditions: the areas of the hole walls of the first weight-reducing holes 27, the second weight-reducing holes 28, and the third weight-reducing holes 29, particularly the area of the hole wall near the outer peripheral surface of the rotor core 2, are made larger while ensuring the overall structural strength of the rotor core 2.

Optionally, as shown in fig. 3, the rotor core 2 further includes a magnetic steel 210, and the magnetic steel 210 is disposed radially outside the core channel.

The manner in which the rotor assembly 100 of the embodiment of the present disclosure dissipates heat is described below with reference to fig. 6:

The cooling medium enters the liquid inlet channel 11 from the liquid inlet 113 and is thrown from the radial section 112 to the liquid inlet groove 31 of the first balance disc by centrifugal force; first, the cooling medium reaches the second communication groove 41 of the second balance disk 4 through the first lightening hole 27; thereafter, the cooling medium enters the second lightening holes 28 and reaches the first communication grooves 32 of the first balance plate 3 along the second lightening holes 28; then, the cooling medium enters the third lightening holes 29 and flows along the third lightening holes 29, forms an S-shaped cooling circuit, and is finally thrown out through the liquid outlet holes 34 of the second balance disc 4.

It should be noted that, with the number of times of the cooling circuit going back and forth in the axial direction of the rotor core 2, the structures of the first balance disc 3 and the second balance disc 4 may be adjusted accordingly, and at the same time, the structures of the communicating grooves may have different forms. Through the design, the rotor core 2 is fully and directly cooled, the magnetic steel 210 can be selected from the marks with lower temperature resistance level, the cost of the rotor core 2 is effectively reduced, and the risk of high-temperature demagnetization is reduced.

The motor of the presently disclosed embodiments includes a rotor assembly 100 as described in any of the embodiments above.

Since the heat dissipation effect of the rotor assembly 100 in the above embodiment is good, the reliability, stability and efficiency of the motor having the rotor assembly 100 of the above embodiment are high.

The vehicle of an embodiment of the present disclosure includes the electric machine of any one of the embodiments described above.

While embodiments of the present disclosure have been shown and described above, it should be understood that the above embodiments are illustrative and not to be construed as limiting the present disclosure, and that variations, modifications, alternatives, and variations of the above embodiments may be made by those of ordinary skill in the art without departing from the scope of the present disclosure.

Claims (12)

1. A rotor assembly, comprising:

The rotating shaft is provided with a liquid inlet channel for cooling medium to enter;

The rotor iron core is sleeved on the rotating shaft and is provided with a first iron core channel, a second iron core channel and a third iron core channel which are communicated along the axial direction of the rotor iron core;

The first balance disc is sleeved on the rotating shaft and arranged on one axial side of the rotor core, the first balance disc is provided with a liquid inlet groove and a first communication groove, a notch faces the rotor core, the liquid inlet channel and the first core channel are communicated with the liquid inlet groove, and the second core channel and the third core channel are communicated with the first communication groove;

The second balance disc is sleeved on the rotating shaft and arranged on the other axial side of the rotor core, the second balance disc is provided with a second communication groove with a notch facing the rotor core, and the first core channel and the second core channel are both communicated with the second communication groove;

The first balance disc and/or the second balance disc is/are provided with a liquid outlet hole for the cooling medium to flow out, and the liquid outlet hole is communicated with the third iron core channel.

2. The rotor assembly of claim 1, wherein the first communication slot and the second communication slot each extend in a circumferential direction of the rotor core;

the first core channel, the second core channel and the third core channel are arranged at intervals along the circumferential direction of the rotor core.

3. The rotor assembly of claim 2 wherein the rotor core includes first and second end faces disposed opposite each other along an axial direction thereof;

A part of the projection of the first communication groove on the second end face is overlapped with at least a part of a port of the second iron core channel on the second end face, another part of the projection of the first communication groove on the first end face is overlapped with at least a part of a port of the first iron core channel on the first end face, and another part of the projection of the first communication groove on the second end face is overlapped with at least a part of a port of the second iron core channel on the first end face.

4. A rotor assembly according to claim 3, wherein the first communication groove has a circular arc shape or a wave shape extending in a circumferential direction of the rotor core; and/or

The second communication groove is arc-shaped or wave-shaped and extends along the circumferential direction of the rotor core.

5. A rotor assembly as claimed in claim 3, wherein the liquid inlet slot and the first communication slot are arranged at intervals along the circumference of the rotor core;

The liquid outlet holes are formed in the second balance disc, and the second communication grooves and the liquid outlet holes are arranged at intervals along the circumferential direction of the rotor core.

6. The rotor assembly of claim 5 wherein the rotor core includes first and second end faces disposed opposite each other along an axial direction thereof;

at least a portion of the projection of the liquid inlet groove on the first end surface coincides with at least a portion of the port of the first iron core channel on the first end surface, and/or

At least a part of the projection of the liquid outlet hole on the second end face of the rotor core is overlapped with at least a part of the port of the third core channel on the second end face.

7. A rotor assembly according to claim 3, wherein the rotor core is provided with a fourth core passage penetrating along an axial direction thereof, the second balancing disk is provided with a third communication groove with a notch facing the rotor core, the third core passage and the fourth core passage are both communicated with the third communication groove, the liquid outlet hole is formed in the first balancing disk, and the liquid outlet hole is communicated with the fourth core passage.

8. The rotor assembly of claim 7 wherein at least a portion of the projection of the liquid feed groove at the first end face coincides with at least a portion of the port of the first core passage at the first end face, and/or

At least a part of the projection of the liquid outlet hole on the second end face of the rotor core is overlapped with at least a part of the port of the fourth core channel on the first end face.

9. The rotor assembly of any one of claims 1-8 wherein the number of the first core passage, the second core passage, the third core passage, the liquid inlet slot, the first communication slot, the second communication slot, and the liquid outlet hole are all plural;

the liquid inlet groove is in one-to-one correspondence with the second communication groove and the first iron core channel, the second iron core channel is in one-to-one correspondence with the first communication groove and the second communication groove, and the third iron core channel is in one-to-one correspondence with the first communication groove and the liquid outlet hole.

10. The rotor assembly of any one of claims 1-8 wherein the rotor core has a first lightening hole, a second lightening hole and a third lightening hole extending axially therethrough, the first lightening hole forming the first core channel, the second lightening hole forming the second core channel, the third lightening hole forming the third core channel; and/or

At least one of the rotor core, the first balance disc, and the second balance disc is arranged symmetrically with respect to a radial direction of the rotor core.

11. An electric machine comprising a rotor assembly according to any one of claims 1-10.

12. A vehicle comprising the electric machine of claim 11.