Rotor assembly, motor and vehicle

Abstract

The invention relates to a rotor assembly, a motor and a vehicle, and relates to the technical field of motors, and the rotor assembly comprises a flow guide ring provided with a first flow channel; and the flow guide ring is arranged at the end part of the rotor iron core, so that a cooling medium flows through the rotor iron core from the first flow channel, and / or flows through the first flow channel from the rotor iron core. Compared with a scheme that a runner is arranged in the middle of the rotor iron core, the rotor iron core needs to relate to a set of rotor punching sheet die, so that the die is slightly changed, and the cost is relatively low.

Description

Technical Field

[0001] The present application relates to the technical field of electric motors, and in particular, to a rotor assembly, an electric motor, and a vehicle. Background Art

[0002] The rotor core is an important component of an electric motor and is part of the magnetic circuit of the motor. It is generally formed by punching and laminating rotor punching sheets with a certain thickness and insulated from each other. The outer circle of the rotor punching sheet is punched with evenly distributed slots for arranging the rotor winding.

[0003] If the temperature of the rotor core is too high, it may cause the efficiency of the motor to decrease and the strength of the rotor to weaken, and even cause the rotor core and the rotor winding to fail, affecting the normal operation and output power of the motor. In order to cool the rotor core, in the related art, a flow channel is provided in the middle of the rotor core, so that the cooling medium passes through the rotor core, and the heat is carried away through the heat transfer between the cooling medium and the rotor core. Two sets of rotor punching sheet molds are required, and the overall cost is relatively high. Summary of the Invention

[0004] Embodiments of the present application provide a rotor assembly, an electric motor, and a vehicle to at least partially solve the above technical problems.

[0005] To achieve the above object, according to the first aspect of the present application, a rotor assembly is provided, including: a guide ring provided with a first flow channel; a rotor core, wherein the guide ring is disposed at an end of the rotor core to facilitate the cooling medium flowing through the rotor core from the first flow channel, and / or flowing through the first flow channel from the rotor core.

[0006] According to the second aspect of the present application, an electric motor is provided, including the above rotor assembly and a stator assembly.

[0007] According to the third aspect of the present application, a vehicle is further provided, including the above rotor assembly or including the above electric motor.

[0008] In the rotor assembly of the embodiments of the present application, a guide ring is provided at an end of the rotor core, and a first flow channel is formed on the guide ring. The first flow channel serves as a channel for the cooling medium to flow. The cooling medium can flow through the rotor core from the first flow channel, thereby cooling the rotor core. The cooling medium can also flow out of the rotor assembly through the rotor core and the first flow channel, thereby cooling the rotor core. Compared with the solution of providing a flow channel in the middle of the rotor core, in the present application, only one set of rotor punching sheet molds is required for the rotor core, with little modification to the molds and relatively low cost.

[0009] Other features and advantages of the present application will be described in detail in the subsequent specific implementation section. Brief Description of the Drawings To more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those skilled in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0010] To more comprehensively understand the present application and its beneficial effects, the following will be described in conjunction with the drawings, where the same reference numerals in the following description represent the same parts.

[0011] Figure 1 It is a schematic diagram of the overall structure of the rotor assembly provided in the exemplary embodiment of the present application.

[0012] Figure 2 is Figure 1 an enlarged schematic view of part A in

[0013] Figure 3 is Figure 1 a sectional view of

[0014] Figure 4 is Figure 1 a further display of the sectional view of

[0015] Figure 5 is Figure 4 an enlarged schematic view of part B in

[0016] Figure 6 is Figure 4 an enlarged schematic view of part C in

[0017] Figure 7 It is an exploded view of the rotor assembly provided in the exemplary embodiment of the present application.

[0018] Figure 8 is Figure 7 an enlarged schematic view of part D in

[0019] Figure 9 is Figure 7 an enlarged schematic view of part E in

[0020] Figure 10 is Figure 1 a schematic diagram of the structure of the rotor core, the bar, and the end ring in

[0021] Figure 11 is Figure 10 an enlarged schematic view of part F in

[0022] Figure 12 is Figure 1 a partial schematic diagram of the diversion ring provided in the exemplary embodiment of the present application.

[0023] Figure 13 is Figure 12 An enlarged schematic view of part G in

[0024] Figure 14 is Figure 1 A cross-sectional view of the flow guiding ring provided in the exemplary embodiment of the present application.

[0025] Figure 15 is Figure 14 An enlarged schematic view of part H in

[0026] Figure 16 A schematic structural view of the rotor punching provided in the exemplary embodiment of the present application.

[0027] Figure 17 A schematic structural view of the rotor core provided in the exemplary embodiment of the present application.

[0028] Figure 18 is Figure 17 An enlarged schematic view of part I in

[0029] Figure 19 is Figure 1 A schematic structural view of the bar and end ring in

[0030] Figure 20 is Figure 19 An enlarged schematic view of part J in

[0031] Figure 21 is Figure 19 An enlarged schematic view of part K in

[0032] Figure 22 A schematic structural view of the flow channel of the cooling medium provided in the exemplary embodiment of the present application.

[0033] Explanation of reference numerals: 10. Flow guide ring; 11. First flow channel; 111. Liquid cavity; 113. First sub-flow channel; 115. First opening; 117. Second sub-flow channel; 116. Second opening; 12. Second convex part; 121. Second groove; 13. Second seal; 14. First convex part; 141. First groove; 15. Main body part; 16. First seal; 17. First liquid guide groove; 171. First groove side wall; 173. Groove bottom wall; 175. Second groove side wall; 176. First groove inner space; 18. Second liquid guide groove; 181. First sub-wall; 183. Second sub-wall; 182. Third sub-wall; 184. Second groove inner space; 19. Third liquid guide groove; 191. Third groove inner space; 20. Rotating shaft; 21. Rotating shaft flow channel; 24. Rotating shaft liquid outlet hole; 22. First liquid outlet hole; 23. Second liquid outlet hole; 30. Rotor core; 36. Rotor punching sheet; 31. Installation groove; 32. Second flow channel; 33. Connection channel; 34. First shaft hole; 35. End face of rotor core; 40. Bar; 50. End ring; 53. Liquid guide hole; 51. Third convex part; 54. Second shaft hole; 541. Hole wall; 60. Step installation position; 70. Rotor compression ring; 80. Oil guide channel; 90. Connection wall; 91. Tooth part; 92. Limit groove. Detailed implementation manners

[0034] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present application.

[0035] The rotor core is an important component on the motor and is a part of the magnetic circuit of the motor. It is generally formed by punching and laminating rotor punching sheets with a certain thickness and insulated from each other. The outer circle of the rotor punching sheet is punched with evenly distributed grooves for arranging the rotor winding.

[0036] Excessive temperature of the rotor core may cause corresponding changes in losses and torque, affecting the normal operation and output power of the motor. In order to cool the rotor core, in the related art, a flow channel is provided in the middle of the rotor core, so that the cooling medium passes through the rotor core, and the heat is taken away through the heat transfer between the cooling medium and the rotor core. Two sets of rotor punching sheet molds need to be involved, and the overall cost is relatively high.

[0037] To at least partially solve the above technical problems, according to the first aspect of the present application, with reference to Figure 1 , Figure 2 , Figure 3 and Figure 4, this application provides a rotor assembly. In some embodiments, the rotor assembly includes: a guide ring 10 provided with a first flow channel 11; a rotor core 30, and the guide ring 10 is disposed at the end of the rotor core 30 to facilitate the cooling medium to flow through the rotor core 30 from the first flow channel 11, and / or from the rotor core 30 through the first flow channel 11. By providing a guide ring 10 at the end of the rotor core 30 and opening a first flow channel 11 on the guide ring 10, the first flow channel 11 serves as a channel for the cooling medium to flow. The cooling medium can pass through the rotor core 30 from the first flow channel 11, thereby cooling the rotor core 30. The cooling medium can also flow out of the rotor assembly through the rotor core 30 and the first flow channel 11, thereby cooling the rotor core 30. Compared with the solution of arranging a flow channel in the middle of the rotor core 30, in this application, only one set of rotor punching die is required for the rotor core 30, with less modification to the die and lower cost.

[0038] The guide ring 10 can be configured with a material of relatively low strength, such as plastic, etc. The cooling medium can be oil. Among them, as long as the cooling medium can flow through the rotor core 30 from the first flow channel 11, and / or from the rotor core 30 through the first flow channel 11, cooling can be achieved.

[0039] Please combine Figure 16 , where the rotor core 30 is part of the motor magnetic circuit and can be laminated into an integral cylindrical shape and sleeved on the rotating shaft with rotor punching sheets 36. The rotor winding is embedded in the slots on the outer circumference of the rotor core.

[0040] In some embodiments, a second flow channel 32 is axially provided in the rotor core 30, and the first flow channel 11 is communicated with the second flow channel 32. With this setting, the cooling medium can flow between the first flow channel 11 and the second flow channel 32, and can fully cool the rotor core 30 axially.

[0041] In some embodiments, the cooling medium can flow from the first flow channel 11 to the stator winding. With this setting, the cooling medium in the first flow channel 11 can cool the stator winding, making the temperature of the stator winding lower than before, improving the cooling capacity of the motor, and enabling stronger power output under the same cooling capacity.

[0042] Please combine Figure 7 、 Figure 8 and Figure 9 , in some embodiments, along the axial direction of the rotor assembly, at least one end of the rotor core 30 is provided with a guide ring 10. In some embodiments, there are two guide rings 10. Along the axial direction of the rotor assembly, the two guide rings 10 are respectively disposed at opposite ends of the rotor core 30, and a second flow channel 32 is axially provided in the rotor core 30, and the second flow channel 32 is respectively communicated with the two first flow channels 11.

[0043] The cooling medium can enter the second flow channel 32 of the rotor core 30 through the first flow channel 11 of a guide ring 10 and then enter the first flow channel 11 of another guide ring 10, so that it can come into more sufficient contact with the rotor core 30 axially and has a better heat exchange effect with the rotor core 30.

[0044] Please combine Figure 7 , in some embodiments, the rotor assembly further includes a rotating shaft 20, and the rotor core 30 and the guide rings 10 are all sleeved on the rotating shaft 20. The rotating shaft 20 is provided with a rotating shaft flow channel 21, and the rotating shaft flow channel 21 is communicated with the first flow channel 11.

[0045] The cooling medium enters the first flow channel 11 of a guide ring 10 through the rotating shaft flow channel 21 of the rotating shaft 20, then enters the second flow channel 32 of the rotor core 30, and then enters the first flow channel 11 of another guide ring 10, and then can flow out of the rotor assembly. After flowing out of the rotor assembly, the cooling medium can be used to cool the stator winding.

[0046] In some embodiments, the rotating shaft 20 is further provided with a rotating shaft liquid outlet hole 24, and the rotating shaft liquid outlet hole 24 communicates the rotating shaft flow channel 21 with the first flow channel 11.

[0047] The rotating shaft liquid outlet hole 24 may include a first liquid outlet hole 22 and a second liquid outlet hole 23. After the cooling medium enters the rotating shaft flow channel 21, it flows out of the rotating shaft flow channel 21 through the rotating shaft liquid outlet hole 24.

[0048] In some embodiments, the rotating shaft flow channel 21 extends along the axial direction of the rotating shaft 20. The rotating shaft liquid outlet hole 24 includes the first liquid outlet hole 22 and the second liquid outlet hole 23 arranged along the axial direction of the rotating shaft 20. The first liquid outlet hole 22 and the second liquid outlet hole 23 are respectively communicated with the rotating shaft flow channel 21, and the first liquid outlet hole 22 and the second liquid outlet hole 23 are respectively communicated with the first flow channels 11 located at the axial two ends of the rotor core 30.

[0049] The direction from the first liquid outlet hole 22 to the second liquid outlet hole 23 may be the first direction, and the direction from the second liquid outlet hole 23 to the first liquid outlet hole 22 may be the second direction. The cooling medium can enter the rotating shaft flow channel 21 from one end of the first liquid outlet hole 22 of the rotating shaft away from the second liquid outlet hole 23. Among them, the flow path of the cooling medium can be divided into the following several paths: The flow path of a part of the cooling medium can be: flowing into the rotating shaft flow channel 21, flowing out of the rotating shaft flow channel 21 from the first liquid outlet hole 22, flowing into the first flow channel 11 near the first liquid outlet hole 22, flowing into the second flow channel 32, flowing into the first flow channel 11 near the second liquid outlet hole 23, and flowing out of the rotor assembly from the first flow channel 11 near the second liquid outlet hole 23. Among them, the arrangement direction of the first flow channel 11 near the first liquid outlet hole 22, the second flow channel 32, and the first flow channel 11 near the second liquid outlet hole 23 is the first direction, and the overall flow direction of this part of the cooling medium is the first direction.

[0050] The flow path of another part of the cooling medium can be as follows: flowing into the rotating shaft flow channel 21, flowing to the second liquid outlet hole 23 along the first direction, flowing into the first flow channel 11 near the second liquid outlet hole 23, entering the second flow channel 32, flowing through the second flow channel 32 along the second direction, flowing into the first flow channel 11 near the first liquid outlet hole 22, and flowing out of the rotor assembly from the first flow channel 11 near the first liquid outlet hole 22. This part of the cooling medium enters the rotating shaft flow channel 21 from the end of the first liquid outlet hole 22 of the rotating shaft that faces away from the second liquid outlet hole 23, first flows in the rotating shaft along the first direction to the second liquid outlet hole 23, enters the second flow channel 32 from the second liquid outlet hole 23, and flows into the first flow channel 11 near the first liquid outlet hole 22 along the second direction in the second flow channel 32, and finally flows out of the rotor assembly from the first flow channel 11 near the first liquid outlet hole 22. The two paths of the cooling medium flow in opposite directions in the second flow channel 32, so as to be able to dissipate heat from the rotor core 30 more fully.

[0051] Please combine Figure 5 , in some embodiments, the first flow channel 11 includes a liquid cavity 111, the guide ring 10 includes a main body portion 15 and a first convex portion 14, the main body portion 15 is sleeved on the rotating shaft 20, the first convex portion 14 is connected to the side of the main body portion 15 facing the rotor core 30, a liquid cavity 111 is provided between the first convex portion 14 and the rotating shaft 20, and the liquid cavity 111 is communicated with the rotating shaft flow channel 21.

[0052] A liquid cavity 111 is provided between the first convex portion 14 and the rotating shaft 20, so that the cooling medium can directly enter the liquid cavity 111 after flowing out of the rotating shaft flow channel 21.

[0053] The cooling medium can enter the rotating shaft flow channel 21 from the end of the first liquid outlet hole 22 of the rotating shaft that faces away from the second liquid outlet hole 23, flow out of the rotating shaft flow channel 21 from the first liquid outlet hole 22, and flow into the liquid cavity 111 of the first flow channel 11 near the first liquid outlet hole 22. In a cross-section perpendicular to the axial direction of the guide ring 10, the first convex portion 14 can be annular.

[0054] In some embodiments, the rotor assembly further includes an end ring 50, and the end ring 50 is used to limit the radial movement of the guide ring 10 along the rotor assembly. With such a setting, the end ring 50 can provide radial protection for the guide ring 10 to prevent the guide ring 10 from being damaged due to centrifugal force.

[0055] In some embodiments, the rotor assembly further includes an end ring 50, the guide ring 10 includes a first sealing member 16, and the first sealing member 16 is clamped between the end ring 50 and the first convex portion 14. In this way, the space between the end ring 50 and the first convex portion 14 is sealed to prevent the leakage of the cooling medium. The first sealing member 16 can be a sealing ring.

[0056] In some embodiments, a first groove 141 is formed on a side of the first convex portion 14 facing away from the rotating shaft 20, and the first seal 16 is installed in the first groove 141. This enables the first seal 16 to be limited within the first groove 141, making it less likely to move and maintaining good sealing performance.

[0057] In some embodiments, the first flow channel 11 includes a first sub-flow channel 113. The main body portion 15 is provided with the first sub-flow channel 113, and the first sub-flow channel 113 communicates with the liquid cavity 111. The cooling medium can enter the rotating shaft flow channel 21 from an end of the first liquid outlet hole 22 of the rotating shaft facing away from the second liquid outlet hole 23, flow out of the rotating shaft flow channel 21 from the first liquid outlet hole 22, flow into the liquid cavity 111 of the first flow channel 11 near the first liquid outlet hole 22, and then flow into the first sub-flow channel 113.

[0058] In some embodiments, the guide ring 10 includes a second convex portion 12. The second convex portion 12 is connected to a side of the main body portion 15 facing the rotor core 30. The second convex portion 12 is located between the rotating shaft 20 and the first convex portion 14, and the second convex portion 12 and the first convex portion 14 form the liquid cavity 111.

[0059] There is a liquid cavity 111 between the second convex portion 12 and the first convex portion 14, allowing the cooling medium to directly enter the liquid cavity 111 after flowing out of the rotating shaft flow channel 21. The second convex portion 12 can be annularly arranged on the outer peripheral side of the rotating shaft 20, which can also position the installation of the rotating shaft 20. And when the rotating shaft is working, it can limit the position of the rotating shaft to prevent it from shaking. In a cross-section perpendicular to the axial direction of the guide ring 10, the second convex portion 12 can be annular.

[0060] In some embodiments, the second convex portion 12 is hermetically connected to the outer peripheral side of the rotating shaft 20. This can prevent the cooling medium from leaking between the second convex portion 12 and the rotating shaft 20.

[0061] In some embodiments, the guide ring 10 includes a second seal 13. The second seal 13 is clamped between the rotating shaft 20 and the second convex portion 12. The second seal 13 can be an O-ring. The second seal 13 is clamped between the rotating shaft 20 and the second convex portion 12, enabling the rotating shaft 20 and the second convex portion 12 to have good sealing performance.

[0062] In some embodiments, a second groove 121 is formed on a side of the second convex portion 12 facing the rotating shaft 20, and the second seal 13 is installed in the second groove 121. This enables the second seal 13 to be limited within the second groove 121, making it less likely to move and maintaining good sealing performance.

[0063] In this application, the processing technology is simple and the assembly process is easy. By providing the second seal 13 and the first seal 16, the reliability of the seal is increased, making it difficult for the cooling medium to leak under high-speed operation.

[0064] In some embodiments, the first flow channel 11 includes a first sub-flow channel 113. The first sub-flow channel 113 includes a first inner groove space 176. A portion of the main body 15 located between the first convex portion 14 and the second convex portion 12 is axially recessed with the first inner groove space 176, and the first inner groove space 176 communicates with the liquid cavity 111.

[0065] The cooling medium can enter the rotating shaft flow channel 21 from one end of the first liquid outlet hole 22 of the rotating shaft facing away from the second liquid outlet hole 23, flow out of the rotating shaft flow channel 21 from the first liquid outlet hole 22, flow into the liquid cavity 111 of the first flow channel 11 close to the first liquid outlet hole 22, and flow into the first inner groove space 176 of the first sub-flow channel 113. The first inner groove space 176 and the liquid cavity 111 can be arranged axially along the main body 15.

[0066] Please refer to Figure 12 and Figure 13 , in some embodiments, the main body 15 includes a first liquid guiding groove 17. The first liquid guiding groove 17 includes a first groove side wall 171, a groove bottom wall 173, and a second groove side wall 175 that are connected in sequence. The first liquid guiding groove 17 is provided with a first inner groove space 176. The second groove side wall 175 is located on a side of the first groove side wall 171 facing away from the rotating shaft 20. The second convex portion 12 is connected to the first groove side wall 171, and the first convex portion 14 is connected to the second groove side wall 175.

[0067] The second convex portion 12 is connected to the first groove side wall 171, and the first convex portion 14 is connected to the second groove side wall 175, so that the first inner groove space 176 communicates with the liquid cavity 111. The cooling medium can flow from the liquid cavity 111 into the first inner groove space 176. The first groove side wall 171 and the second groove side wall 175 can be arranged radially along the main body 15.

[0068] Please refer to Figure 14 and Figure 15 , in some embodiments, the first sub-flow channel 113 includes a second inner groove space 184. The second groove side wall 175 is recessed with the second inner groove space 184 in a direction radially outward along the main body 15.

[0069] The cooling medium can enter the rotating shaft flow channel 21 from one end of the first liquid outlet hole 22 of the rotating shaft facing away from the second liquid outlet hole 23, flow out of the rotating shaft flow channel 21 from the first liquid outlet hole 22, flow into the liquid cavity 111 of the first flow channel 11 close to the first liquid outlet hole 22, flow into the first inner groove space 176 of the first sub-flow channel 113, and flow into the second inner groove space 184.

[0070] The second groove side wall 175 is recessed with the second inner groove space 184 in a direction radially outward along the main body 15. The second inner groove space 184 is located outside the first inner groove space 176. The second inner groove space 184 and the first inner groove space 176 are arranged radially along the main body 15.

[0071] In some embodiments, the main body 15 includes a second liquid conducting groove 18, the second liquid conducting groove 18 is provided with a second groove space 184, the second liquid conducting groove 18 includes a first sub-wall 181 and a second sub-wall 183 arranged along the axial direction of the rotating shaft 20, and a third sub-wall 182 connected between the first sub-wall 181 and the second sub-wall 183, and the third sub-wall 182 is arranged opposite to the first groove side wall 171.

[0072] In some embodiments, the first sub-channel 113 further includes a third groove space 191, and the third sub-wall 182 is recessed with the third groove space 191 radially outwardly of the main body 15. The main body 15 includes a third liquid guide groove 19, and the third liquid guide groove 19 is provided with a third groove space 191.

[0073] The cooling medium can enter the shaft flow channel 21 from the end of the first liquid outlet hole 22 of the shaft away from the second liquid outlet hole 23, flow out of the shaft flow channel 21 from the first liquid outlet hole 22, flow into the liquid cavity 111 of the first flow channel 11 near the first liquid outlet hole 22, flow into the first groove space 176 of the first sub-flow channel 113, flow into the second groove space 184, and flow into the third groove space 191. The third groove space 191 and the second groove space 184 can be arranged along the radial direction of the main body 15. The first groove space 176, the second groove space 184, and the third groove space 191 can be arranged in sequence along the radial direction of the main body 15. The third groove space 191 has the function of collecting oil and can collect a part of the cooling medium.

[0074] In some embodiments, there are multiple third slot spaces 191, and the multiple third slot spaces 191 are spaced apart and distributed along the circumference of the main body 15, so that the third slot spaces 191 can collect more cooling medium.

[0075] In some embodiments, the main body 15 is provided with a first opening 115 on one side facing the rotor core 30, and the first opening 115 connects the third slot space 191 with the second flow channel 32. The cooling medium can enter the shaft flow channel 21 from the end of the first liquid outlet hole 22 of the shaft away from the second liquid outlet hole 23, flow out of the shaft flow channel 21 from the first liquid outlet hole 22, flow into the liquid cavity 111 of the first flow channel 11 near the first liquid outlet hole 22, flow into the first slot space 176 of the first sub-flow channel 113, flow into the second slot space 184, and flow into the third slot space 191. A portion of the cooling medium entering the third slot space 191 can be collected in the third slot space 191, and a portion can flow from the first opening 115 to the second flow channel 32.

[0076] In some embodiments, there are multiple first openings 115, and the first openings 115 are arranged one-to-one with the third slot spaces 191. In this way, the cooling medium in the multiple third slot spaces 191 can flow out from the multiple first openings 115 at the same time, thereby improving the cooling efficiency of the cooling medium.

[0077] In some embodiments, the third sub-wall 182 further includes a plurality of connecting walls 90, and along the circumference of the main body 15, any two adjacent third slot spaces 191 are spaced apart by a connecting wall 90. The connecting wall 90 enables any two adjacent third slot spaces 191 to be spaced apart by a connecting wall 90, so that the cooling medium is collected in the third slot spaces 191.

[0078] Please combine Figure 6 In some embodiments, the first flow channel 11 further includes a second sub-flow channel 117. A connecting wall 90 is provided with a second sub-flow channel 117. One end of the second sub-flow channel 117 extends along a side away from the rotating shaft 20, so that the cooling medium can flow from the second sub-flow channel 117 to the stator winding. The cooling medium can enter the rotating shaft flow channel 21 from the end of the first liquid outlet 22 of the rotating shaft away from the second liquid outlet 23, flow out of the rotating shaft flow channel 21 from the first liquid outlet 22, flow into the liquid cavity 111 of the first flow channel 11 near the first liquid outlet 22, flow into the first slot space 176 of the first sub-flow channel 113, flow into the second slot space 184, and flow into the third slot space 191. A portion of the cooling medium entering the third slot space 191 can be collected in the third slot space 191, and a portion can flow from the first opening 115 to the second flow channel 32, and flow from the second flow channel 32 to the second sub-flow channel 117 of the first flow channel 11 near the second liquid outlet 23, and flow out of the rotor assembly through the second sub-flow channel 117, and flow to the stator winding, thereby cooling the stator winding. The second sub-flow channel 117 extends in the radial direction of the main body 15.

[0079] In some embodiments, the end of the second sub-channel 117 close to the rotating shaft 20 is blocked. The cooling medium flowing into the second sub-channel 117 can flow out of the rotor assembly and flow to the stator winding. The second sub-channel 117 extends in the radial direction of the main body 15. The end of the second sub-channel 117 close to the rotating shaft 20 is blocked. That is, the end of the second sub-channel 117 close to the first sub-channel 113 is blocked. The cooling medium will not flow from the second sub-channel 117 into the first sub-channel 113.

[0080] In some embodiments, the connecting wall 90 is provided with a second opening 116, and the second opening 116 communicates the second sub-channel 117 with the second channel 32. The cooling medium can enter the rotating shaft channel 21 from one end of the first liquid outlet hole 22 of the rotating shaft departing from the second liquid outlet hole 23, flow out of the rotating shaft channel 21 from the first liquid outlet hole 22, flow into the liquid cavity 111 of the first channel 11 near the first liquid outlet hole 22, flow into the first groove inner space 176 of the first sub-channel 113, flow into the second groove inner space 184, and flow into the third groove inner space 191. A part of the cooling medium entering the third groove inner space 191 can be collected in the third groove inner space 191, a part can flow from the first opening 115 to the second channel 32, and flow into the second sub-channel 117 of the first channel 11 near the second liquid outlet hole 23 through the second opening 116, and flow out of the rotor assembly through the second sub-channel 117 and flow to the stator winding, so as to cool and dissipate heat for the stator winding.

[0081] In some embodiments, a plurality of connecting walls 90 extend outwards along the radial outer side of the main body portion 15 to form a plurality of tooth portions 91. A limiting groove 92 is formed between any two adjacent tooth portions 91. The rotor assembly further includes an end ring 50. The end ring 50 is provided with a plurality of third protrusions 51 on the side facing the guide ring 10. The third protrusions 51 are installed in the limiting groove 92, and at least two third protrusions 51 are arranged along the radial direction of the guide ring 10. With such an arrangement, radial protection can be provided for the guide ring 10 to prevent the guide ring 10 from being damaged due to centrifugal force.

[0082] Since the third protrusion 51 and the limiting groove 92 are connected in a concave-convex matching manner, the structure between the guide ring 10 and the end ring 50 is compact, and the axial length of the rotor assembly is smaller.

[0083] In some embodiments, the rotor assembly further includes a bar 40, and the bar 40 is installed on the rotor core 30. The first channel 11 communicates with the bar 40.

[0084] The rotor winding of the rotor assembly can be a squirrel-cage rotor winding: when the rotor core 30 is removed, the outer shape of the entire rotor winding is close to the shape of a squirrel cage.

[0085] At present, electric drive products are developing towards higher speed and efficiency. Compared with synchronous motors, asynchronous motors have relatively lower efficiency, mainly due to the relatively large losses in the rotor squirrel cage. The losses in the rotor squirrel cage are positively correlated with temperature. The greater the losses, the higher the temperature, and the lower the efficiency. The rotor squirrel cage includes bars penetrating the rotor core and end rings provided at both ends of the bars, and a number of bars are arranged circumferentially. The additional losses of a cast aluminum rotor are proportional to the resistance of the bars. Since the resistance of the bars increases with the increase in temperature, when the motor is operating, its losses increase with the increase in temperature, and the efficiency decreases, affecting the normal operation of the motor and even the driving range of the entire vehicle. At the same time, the strength of the bars and end rings decreases with the increase in temperature, and there are also safety hazards when the motor is running at high speed.

[0086] The rotor assembly proposed in this application can directly cool the bars, and has a good cooling effect on the bars. It can also cool the end rings, rotor core and stator windings. The oil circuit structure is complete, the utilization rate of the cooling medium is high, the cooling speed is accelerated, and the heat dissipation efficiency is improved.

[0087] Please combine Figure 17 and Figure 18 , in some embodiments, the rotor core 30 is provided with an installation groove 31, and the installation groove 31 axially penetrates the rotor core 30 along the rotor core 30. Please combine Figure 19 , the bar 40 is located in the installation groove 31, and the installation groove 31 communicates with the second flow channel 32.

[0088] The cooling medium can enter the shaft flow channel 21 from the end of the first liquid outlet hole 22 of the shaft that is away from the second liquid outlet hole 23, flow out of the shaft flow channel 21 from the first liquid outlet hole 22, flow into the liquid cavity 111 of the first flow channel 11 close to the first liquid outlet hole 22, flow into the first groove inner space 176 of the first sub-flow channel 113, flow into the second groove inner space 184, and flow into the third groove inner space 191. A part of the cooling medium entering the third groove inner space 191 can be collected in the third groove inner space 191, and a part can flow from the first opening 115 to the second flow channel 32 and then to the installation groove 31. With such a setting, the cooling medium can directly cool the bars in the installation groove from the second flow channel, and the cooling effect is good.

[0089] It is easy to understand that the cooling efficiency of the cooling structure determines the upper limits of the performance, reliability and insulation life of the motor. The rotor assembly of this application can be the rotor assembly of an asynchronous motor. By directly cooling the bars in the rotor assembly, the efficiency and strength of the motor at high speed can be improved, the driving range and top speed of the entire vehicle can be increased, and the goals of cost reduction, efficiency improvement, speed increase and performance improvement of the asynchronous motor can be achieved.

[0090] In some embodiments, the rotor core 30 is provided with mounting grooves 31, and each mounting groove 31 contains a copper or aluminum guide bar as a rotor conductor. The two ends of the guide bar are short-circuited by end rings to form a closed loop. In some examples, during manufacturing, the bare copper bars are inserted into the mounting grooves 31 of the rotor core 30, and then the end rings are sleeved on the heads of the copper bars at both ends and welded together; in some examples, the stacked rotor core 30 can be placed in a die for casting aluminum during manufacturing.

[0091] In some embodiments, there are multiple mounting grooves 31, and the multiple mounting grooves 31 are arranged circumferentially along the rotor core 30.

[0092] In some embodiments, there are multiple second flow channels 32, and one second flow channel 32 communicates with one mounting groove 31. Thus, the guide bars in the multiple mounting grooves 31 can be cooled separately, improving the cooling efficiency.

[0093] In some embodiments, the rotor core 30 is further provided with a connection channel 33, and the connection channel 33 is used to communicate the mounting groove 31 with the second flow channel 32.

[0094] The cooling medium can enter the shaft flow channel 21 from the end of the first liquid outlet hole 22 of the rotating shaft that is away from the second liquid outlet hole 23, flow out of the shaft flow channel 21 from the first liquid outlet hole 22, flow into the liquid cavity 111 of the first flow channel 11 near the first liquid outlet hole 22, flow into the first groove inner space 176 of the first sub-flow channel 113, flow into the second groove inner space 184, and flow into the third groove inner space 191. A part of the cooling medium entering the third groove inner space 191 can be collected in the third groove inner space 191, and a part can flow from the first opening 115 to the second flow channel 32, the connection channel 33, and then to the mounting groove 31.

[0095] In some embodiments, the connection channel 33 axially penetrates the rotor core 30 along the axis of the rotor core 30.

[0096] It can cool the guide bar along the axis of the rotor core 30, improving the cooling efficiency.

[0097] In some embodiments, there are multiple connection channels 33 and multiple mounting grooves 31, and one connection channel 33 is used to communicate one mounting groove 31 with one second flow channel 32. Thus, it is convenient to cool the guide bars in the multiple mounting grooves 31 separately, improving the cooling efficiency.

[0098] In some embodiments, in a cross-section perpendicular to the axis of the rotor core 30, the width of the connection channel 33 is smaller than the minimum width of the mounting groove 31. Thus, it is convenient to distinguish the mounting groove 31 and the second flow channel 32, and since the guide bar 40 needs to be installed in the mounting groove 31 and then demolding and debris cleaning are required, such a design is beneficial for demolding and debris cleaning.

[0099] In some embodiments, the second flow channel 32 is located radially inside the rotor core 30 with respect to the mounting groove 31. The cooling medium can sufficiently cool the conducting bars 40 and the rotor core 30 simultaneously.

[0100] In some embodiments, the rotor assembly further includes end rings 50. The end rings 50 are connected to the ends of the conducting bars 40 and are located at the ends of the rotor core 30.

[0101] The rotor assembly further includes end rings 50. The end rings 50 are connected to the ends of the conducting bars 40, thus forming a rotor squirrel-cage structure. The end rings 50, the conducting bars 40, and the rotor core 30 can be processed by casting. During assembly, the end rings 50, the conducting bars 40, and the rotor core 30 can be processed and installed first, then the rotating shaft 20 is installed, then the rotor retaining ring 70 is pressed in, and then the second seal 13, the first seal 16, and the diversion ring 10 are installed to complete the assembly of the entire rotor assembly.

[0102] Please refer to Figure 20 and Figure 21 , in some embodiments, the end ring 50 is provided with a liquid guiding hole 53. The liquid guiding hole 53 is used to communicate the first flow channel 11 and the second flow channel 32. By providing the liquid guiding hole 53 in the end ring 50, the liquid guiding hole 53 communicates the first flow channel 11 and the second flow channel 32, so that the cooling medium can enter the second flow channel 32 from the first flow channel 11 and the liquid guiding hole 53. The second flow channel 32 and the liquid guiding hole 53 are processed by a mold.

[0103] Specifically, the cooling medium can enter the rotating shaft flow channel 21 from one end of the first liquid outlet hole 22 of the rotating shaft facing away from the second liquid outlet hole 23, flow out of the rotating shaft flow channel 21 from the first liquid outlet hole 22, flow into the liquid cavity 111 of the first flow channel 11 near the first liquid outlet hole 22, flow into the first groove inner space 176 of the first sub-flow channel 113, flow into the second groove inner space 184, and flow into the third groove inner space 191. A part of the cooling medium entering the third groove inner space 191 can be collected in the third groove inner space 191, and a part can flow from the first opening 115 to the liquid guiding hole 53 into the second flow channel 32 and flow into the second sub-flow channel 117 of the first flow channel 11 near the second liquid outlet hole 23 through the second opening 116, and then flow out of the rotor assembly through the second sub-flow channel 117 to complete oil slinging to the stator winding and complete the cooling of the stator winding.

[0104] Please refer to Figure 10 and Figure 11 , in some embodiments, the rotor assembly further includes a rotating shaft 20. The rotor core 30 is provided with a first shaft hole 34 for the rotating shaft 20 to pass through, and the end ring 50 is provided with a second shaft hole 54 for the rotating shaft to pass through. The aperture of the second shaft hole 54 is larger than the aperture of the first shaft hole 34. In this way, it is convenient to install the rotating shaft.

[0105] In some embodiments, a stepped mounting position 60 is formed between the hole wall 541 of the second shaft hole 54 and the end face 35 of the rotor core. The rotor assembly further includes a rotor retaining ring 70, which is sleeved on the rotating shaft 20 and mounted in the stepped mounting position 60. The structure is compact, reducing the axial length of the rotor assembly.

[0106] In some embodiments, there is an oil guiding channel 80 between the end face of the rotor retaining ring 70 facing away from the rotor core 30 and the guiding ring 10. The rotating shaft 20 is provided with a rotating shaft flow channel 21, and the oil guiding channel 80 is respectively communicated with the rotating shaft flow channel 21 and the first flow channel 11. The cooling medium can pass through the rotating shaft flow channel 21, the oil guiding channel 80, the first flow channel 11, and the second flow channel 32. It can cool and dissipate heat for the rotor retaining ring 70.

[0107] Specifically, the cooling medium can enter the rotating shaft flow channel 21 from one end of the first liquid outlet hole 22 of the rotating shaft facing away from the second liquid outlet hole 23, flow out of the rotating shaft flow channel 21 from the first liquid outlet hole 22, flow into the oil guiding channel 80, flow into the liquid cavity 111 of the first flow channel 11 close to the first liquid outlet hole 22, flow into the first groove inner space 176 of the first sub-flow channel 113, flow into the second groove inner space 184, and flow into the third groove inner space 191. A part of the cooling medium entering the third groove inner space 191 can be collected in the third groove inner space 191, and a part can flow from the first opening 115 to the second flow channel 32 and flow into the second sub-flow channel 117 of the first flow channel 11 close to the second liquid outlet hole 23 through the second opening 116, and then flow out of the rotor assembly through the second sub-flow channel 117 and flow to the stator winding.

[0108] Figure 22 shows a schematic structural diagram of the flow channel of the cooling medium provided in the exemplary embodiment of the present application. Among them, Figure 22 the structure in is not a physical structure, but the form of each flow channel. For example, Figure 22 shows the rotating shaft flow channel 21, the second flow channel 32, etc.

[0109] In some embodiments, along the axial direction of the rotating shaft, at least part of the end ring 50 protrudes from the rotor retaining ring 70.

[0110] Since the rotor retaining ring 70 is mounted in the stepped mounting position 60 and at least part of the end ring 50 protrudes from the rotor retaining ring 70, the cooling medium in the oil guiding channel 80 can directly cool the end ring 50. Thus, the problem that the high temperature reduces the strength of the conducting bar and the end ring can be solved, enabling the motor to reach a higher speed and operate more safely at high speeds.

[0111] In some embodiments, part of the guiding ring 10 is mounted in the stepped mounting position 60.

[0112] In some embodiments, at least a part of the second convex portion 12 may be located at the stepped mounting position 60 and abut against the hole wall 541 of the second shaft hole 54, making the axial length of the rotor assembly smaller.

[0113] In some embodiments, the end ring 50 is provided with a limiting portion, and the guide ring 10 is provided with a mating portion. The mating portion is connected to the limiting portion in a mating manner and is used to limit the radial movement of the guide ring 10 along the rotor assembly. With such a setting, the first limiting portion can provide radial protection for the guide ring 10 and prevent the guide ring 10 from being damaged due to centrifugal force.

[0114] In some embodiments, the limiting portion includes a third convex portion 51, and the mating portion includes a limiting groove 92. The third convex portion 51 is connected to the limiting groove 92 in a mating manner and is used to limit the radial movement of the guide ring 10 along the rotor assembly. With such a setting, radial protection can be provided for the guide ring 10 to prevent the guide ring 10 from being damaged due to centrifugal force. Since the third convex portion 51 is connected to the limiting groove 92 by means of concave-convex mating, the structure between the guide ring 10 and the end ring 50 is compact, making the axial length of the rotor assembly smaller.

[0115] Through the present application, all-round cooling of the rotor assembly can be achieved, the cooling efficiency of the cooling medium is improved, and it has the advantages of low modification cost, good cooling effect, high feasibility, etc.

[0116] The motor structure of the present application is compact, with a smaller volume, higher torque or power density, higher motor efficiency and cooling efficiency, and can meet the requirements of high speed, high efficiency and low cost of the electric drive system. The cost is lower.

[0117] In some embodiments, there are two guide rings 10. Along the axial direction of the rotor assembly, the two guide rings 10 are respectively arranged at opposite ends of the rotor core 30. The second flow channel 32 is axially provided in the rotor core 30, and the second flow channel 32 is respectively communicated with the two first flow channels 11; the rotor assembly further includes a rotating shaft 20. The rotating shaft 20 is provided with a rotating shaft flow channel 21, a first liquid outlet hole 22 and a second liquid outlet hole 23. The rotating shaft flow channel 21 extends along the axial direction of the rotating shaft 20, and the first liquid outlet hole 22 and the second liquid outlet hole 23 are arranged along the axial direction of the rotating shaft 20. The first liquid outlet hole 22 and the second liquid outlet hole 23 are respectively communicated with the rotating shaft flow channel 21, and the first liquid outlet hole 22 and the second liquid outlet hole 23 are respectively communicated with the first flow channels 11 located at the opposite ends of the rotor core 30 in the axial direction. The cooling medium can enter the rotating shaft flow channel 21 from one end of the first liquid outlet hole 22 of the rotating shaft away from the second liquid outlet hole 23, flow out of the rotating shaft flow channel 21 from the first liquid outlet hole 22, flow into the first flow channel 11 near the first liquid outlet hole 22, and a part of it can enter the second flow channel 32 and flow out of the rotor assembly.

[0118] According to the second aspect of the present application, a motor is provided, which includes the above-mentioned rotor assembly and stator assembly. This motor has all the beneficial effects of the above-mentioned minimum protection subject matter, and the present application will not elaborate here.

[0119] Through the present application, the motor efficiency can be improved, and at the same time, the cruising range of the whole vehicle can be increased. At the same time, the cost of the motor is reduced, achieving the effects of improving the efficiency, speed, and performance of the motor.

[0120] The motor of the present application is an asynchronous motor, and its main structure may include: a stator assembly and a rotor assembly. The stator assembly is the stationary part of the motor and is composed of a frame, a stator core, and a stator winding. The rotor assembly is the rotating part of the motor, and the rotating shaft is generally made of medium carbon steel, which plays the role of supporting, fixing the rotor core, and transmitting power.

[0121] According to the third aspect of the present application, a vehicle is provided, which includes the above-mentioned rotor assembly or includes the above-mentioned motor. This vehicle has all the beneficial effects of the above-mentioned rotor assembly or motor, and the present application will not elaborate here.

[0122] The vehicle can be a fuel vehicle, a plug-in hybrid vehicle, a new energy vehicle, etc., and the present application does not make specific limitations on this.

[0123] In the description of the present application, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more features. In the description of the present application, the meaning of "a plurality" is two or more, unless otherwise specifically defined.

[0124] In the above embodiments, the descriptions of the respective embodiments have their own emphases. For the parts not detailed in a certain embodiment, reference may be made to the relevant descriptions of other embodiments.

[0125] Among the embodiments, implementation manners, and related technical features of the present application, they can be combined and replaced with each other without conflict.

[0126] The above are only the preferred embodiments of the present application, and there is no any form of limitation to the present application. However, any modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application still fall within the scope of the technical solution of the present application.

Claims

1. A rotor assembly, characterized in that, Comprising: A diversion ring provided with a first flow channel; A rotor core, the diversion ring being disposed at an end of the rotor core so that a cooling medium flows through the rotor core from the first flow channel, and / or flows through the first flow channel from the rotor core.

2. The rotor assembly according to claim 1, wherein, A second flow channel is axially provided in the rotor core, and the first flow channel communicates with the second flow channel.

3. The rotor assembly according to claim 1, wherein The cooling medium can flow from the first flow channel to the stator winding.

4. The rotor assembly according to claim 1, characterized in that Axially along the rotor assembly, at least one end of the rotor core is provided with the diversion ring.

5. The rotor assembly according to claim 1, wherein There are two diversion rings. Axially along the rotor assembly, the two diversion rings are respectively disposed at opposite ends of the rotor core. A second flow channel is axially provided in the rotor core, and the second flow channel communicates with the two first flow channels respectively.

6. The rotor assembly according to claim 5, wherein The rotor assembly further includes a rotating shaft, the rotor core and the diversion ring are both sleeved on the rotating shaft, and the rotating shaft is provided with a rotating shaft flow channel, and the rotating shaft flow channel communicates with the first flow channel.

7. The rotor assembly according to claim 6, wherein, The rotating shaft is further provided with a rotating shaft liquid outlet hole, and the rotating shaft liquid outlet hole communicates the rotating shaft flow channel with the first flow channel.

8. The rotor assembly according to claim 7, wherein, The rotating shaft flow channel extends axially along the rotating shaft. The rotating shaft liquid outlet hole includes a first liquid outlet hole and a second liquid outlet hole arranged axially along the rotating shaft. The first liquid outlet hole and the second liquid outlet hole communicate with the rotating shaft flow channel respectively, and the first liquid outlet hole and the second liquid outlet hole communicate with the first flow channels located at opposite axial ends of the rotor core respectively.

9. The rotor assembly according to claim 6, wherein The first flow channel includes a liquid cavity. The diversion ring includes a main body portion and a first convex portion. The main body portion is sleeved on the rotating shaft. The first convex portion is connected to a side of the main body portion facing the rotor core. A liquid cavity is provided between the first convex portion and the rotating shaft, and the liquid cavity communicates with the rotating shaft flow channel.

10. The rotor assembly according to claim 9, wherein, The rotor assembly further includes an end ring for limiting the radial movement of the diversion ring along the rotor assembly.

11. The rotor assembly according to claim 10, characterized in that, The diversion ring includes a first seal, and the first seal is clamped between the end ring and the first convex portion.

12. The rotor assembly according to claim 11, wherein, A first groove is provided on a side of the first convex portion facing away from the rotating shaft, and the first seal is installed in the first groove.

13. The rotor assembly according to claim 9, wherein The first flow channel includes a first sub-flow channel, and the main body portion is provided with the first sub-flow channel, and the first sub-flow channel communicates with the liquid cavity.

14. The rotor assembly according to claim 9, wherein, The diversion ring includes a second convex portion, and the second convex portion is connected to a side of the main body portion facing the rotor core. The second convex portion is located between the rotating shaft and the first convex portion, and the second convex portion and the first convex portion form the liquid cavity.

15. The rotor assembly according to claim 14, wherein The second convex portion is sealingly connected to the outer peripheral side of the rotating shaft.

16. The rotor assembly according to claim 14, characterized in that, The diversion ring includes a second seal, and the second seal is clamped between the rotating shaft and the second convex portion.

17. The rotor assembly according to claim 16, wherein, A second groove is provided on a side of the second convex portion facing the rotating shaft, and the second seal is installed in the second groove.

18. The rotor assembly according to claim 14, characterized in that, The first flow channel includes a first sub-flow channel, and the first sub-flow channel includes a first space in the groove. A portion of the main body portion located between the first convex portion and the second convex portion is axially recessed with the first space in the groove, and the first space in the groove communicates with the liquid cavity.

19. The rotor assembly according to claim 18, characterized in that, The main body includes a first liquid conducting groove, which includes a first groove side wall, a groove bottom wall and a second groove side wall connected in sequence, the first liquid conducting groove is provided with the first groove inner space, the second groove side wall is located on the side of the first groove side wall away from the rotating shaft, the second protrusion is connected to the first groove side wall, and the first protrusion is connected to the second groove side wall.

20. The rotor assembly according to claim 19, characterized in that, The first sub-channel includes a second groove inner space, and the second groove inner space is recessed on the second groove sidewall along the radial outward direction of the main body.

21. The rotor assembly according to claim 20, wherein, The main body includes a second liquid conducting groove, the second liquid conducting groove is provided with a second groove inner space, the second liquid conducting groove includes a first sub-wall and a second sub-wall arranged along the axial direction of the rotating shaft, and a third sub-wall connected between the first sub-wall and the second sub-wall, and the third sub-wall is arranged opposite to the first groove side wall.

22. The rotor assembly according to claim 21, wherein The first sub-channel further includes a third groove space, and the third sub-wall is recessed outwardly along the radial direction of the main body to form the third groove space.

23. The rotor assembly according to claim 22, wherein There are a plurality of third groove spaces, and the plurality of third groove spaces are distributed at intervals along the circumference of the main body.

24. The rotor assembly according to claim 23, characterized in that, A first opening is formed on a side of the main body facing the rotor core, and the first opening communicates the space in the third slot with the second flow channel.

25. The rotor assembly according to claim 24, wherein There are a plurality of first openings, and the first openings are arranged in one-to-one correspondence with the spaces in the third groove.

26. The rotor assembly according to claim 22, wherein, The third sub-wall further includes a plurality of connecting walls, and along the circumference of the main body, any two adjacent third groove spaces are spaced apart by a connecting wall.

27. The rotor assembly according to claim 26, wherein, The first flow channel also includes a second sub-flow channel. A second sub-flow channel is formed on the connecting wall. One end of the second sub-flow channel extends along a side away from the rotating shaft to facilitate the cooling medium to flow from the second sub-flow channel to the stator winding.

28. The rotor assembly according to claim 27, wherein, One end of the second sub-channel close to the rotating shaft is blocked.

29. The rotor assembly according to claim 27, characterized in that, The connecting wall is provided with a second opening, and the second opening connects the second sub-channel and the second channel.

30. The rotor assembly according to claim 26, characterized in that, A plurality of connecting walls extend outwardly along the radial outer side of the main body to form a plurality of teeth, and a limiting groove is formed between any two adjacent teeth. The rotor assembly also includes an end ring, and a plurality of third protrusions are provided on the side of the end ring facing the guide ring. The third protrusions are installed in the limiting grooves, and at least two of the third protrusions are arranged radially along the guide ring.

31. The rotor assembly according to any one of claims 2 to 30, characterized in that, The rotor assembly further includes a guide bar, wherein the guide bar is mounted on the rotor core, and the first flow channel is in communication with the guide bar.

32. The rotor assembly according to claim 31, characterized in that, The rotor core is provided with a mounting groove, the mounting groove penetrates the rotor core along the axial direction of the rotor core, the guide bar is located in the mounting groove, and the mounting groove is communicated with the second flow channel.

33. The rotor assembly according to claim 32, wherein, There are a plurality of mounting grooves, and the plurality of mounting grooves are arranged along the circumferential direction of the rotor core.

34. The rotor assembly according to claim 33, wherein, There are a plurality of the second flow channels, and one of the second flow channels is communicated with one of the mounting grooves.

35. The rotor assembly according to claim 32, characterized in that, The rotor core is further provided with a connecting channel, and the connecting channel is used to connect the mounting groove and the second flow channel.

36. The rotor assembly according to claim 35, characterized in that, The connecting passage penetrates the rotor core along the axial direction of the rotor core.

37. The rotor assembly according to claim 35, characterized in that, There are a plurality of the connecting channels, a plurality of the mounting grooves, and one of the connecting channels is used to connect one of the mounting grooves with one of the second flow channels.

38. The rotor assembly according to claim 35, wherein, In a cross-section perpendicular to the axial direction of the rotor core, the width of the connection channel is smaller than the minimum width of the installation groove.

39. The rotor assembly according to claim 35, characterized in that, The second flow channel is located radially inside the rotor core relative to the installation groove.

40. The rotor assembly according to claim 31, characterized in that, The rotor assembly further includes end rings, which are connected to the ends of the conducting bars and are located at the ends of the rotor core.

41. The rotor assembly according to claim 40, characterized in that, The end rings are provided with liquid guiding holes for communicating the first flow channel and the second flow channel.

42. The rotor assembly according to claim 40, characterized in that, The rotor assembly further includes a rotating shaft. The rotor core is provided with a first shaft hole for the rotating shaft to pass through, and the end ring is provided with a second shaft hole for the rotating shaft to pass through. The aperture of the second shaft hole is larger than that of the first shaft hole.

43. The rotor assembly according to claim 42, characterized in that, The pore wall of the second shaft hole and the end face of the rotor core form a stepped mounting position. The rotor assembly further includes a rotor retaining ring, which is sleeved on the rotating shaft and mounted on the stepped mounting position.

44. The rotor assembly according to claim 43, wherein, There is an oil guiding channel between the end face of the rotor retaining ring facing away from the rotor core and the guide ring. The rotating shaft is provided with a rotating shaft flow channel, and the oil guiding channel is respectively communicated with the rotating shaft flow channel and the first flow channel.

45. The rotor assembly according to claim 43, wherein, Along the axial direction of the rotating shaft, at least part of the end ring protrudes from the rotor retaining ring.

46. The rotor assembly according to claim 43, wherein, Part of the guide ring is mounted on the stepped mounting position.

47. The rotor assembly according to claim 40, wherein, The end ring is provided with a limiting portion, and the guide ring is provided with a mating portion. The mating portion is connected with the limiting portion in a mating manner to limit the radial movement of the guide ring along the rotor assembly.

48. The rotor assembly according to claim 47, wherein, The limiting portion includes a third convex portion, and the mating portion includes a limiting groove. The third convex portion is connected with the limiting groove in a mating manner to limit the radial movement of the guide ring along the rotor assembly.

49. The rotor assembly according to any one of claims 1 to 30, characterized in that, There are two guide rings. Along the axial direction of the rotor assembly, the two guide rings are respectively arranged at opposite ends of the rotor core. The axial direction of the rotor core is provided with a second flow channel, and the second flow channel is respectively communicated with the two first flow channels. The rotor assembly further includes a rotating shaft. The rotating shaft is provided with a rotating shaft flow channel, a first liquid outlet hole and a second liquid outlet hole. The rotating shaft flow channel extends along the axial direction of the rotating shaft. The first liquid outlet hole and the second liquid outlet hole are arranged along the axial direction of the rotating shaft. The first liquid outlet hole and the second liquid outlet hole are respectively communicated with the rotating shaft flow channel. The first liquid outlet hole and the second liquid outlet hole are respectively communicated with the first flow channels located at the axial two ends of the rotor core.

50. A motor, characterized in that, Comprising the rotor assembly and the stator assembly according to any one of claims 1-49.

51. A vehicle, characterized in that, Comprising the rotor assembly according to any one of claims 1-49 or the electric machine according to claim 50.

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