Rotor assemblies, motors and vehicles

Abstract

This application relates to a rotor assembly, a motor, and a vehicle, specifically in the field of electric motor technology. The rotor assembly includes a guide ring with a first flow channel; a rotor core, with the guide ring disposed at the end of the rotor core to facilitate the flow of cooling medium from the first flow channel through the rotor core, and / or from the rotor core through the first flow channel. Compared to solutions that involve setting the flow channel in the middle of the rotor core, this application only requires one set of rotor lamination dies, resulting in minimal die modifications and lower costs.

Description

Technical Field

[0001] This application relates to the field of electric motor technology, and more particularly to a rotor assembly, an electric motor, and a vehicle. Background Technology

[0002] The rotor core is an important component of an electric motor and is part of the motor's magnetic circuit. It is generally made by stamping and stacking rotor laminations of a certain thickness that are mutually insulated. The outer circle of the rotor laminations has evenly distributed slots for housing the rotor windings.

[0003] Excessive rotor core temperature can lead to reduced motor efficiency and weakened rotor strength, and may even cause failure of the rotor core and rotor windings, affecting the normal operation and output power of the motor. In order to cool the rotor core, related technologies have set up flow channels in the middle of the rotor core so that the cooling medium passes through the rotor core and the heat is dissipated through the heat transfer between the cooling medium and the rotor core. This requires two sets of rotor lamination dies, which results in a high overall cost. Summary of the Invention

[0004] This application provides a rotor assembly, a motor, and a vehicle to at least partially solve the aforementioned technical problems.

[0005] To achieve the above objectives, according to a first aspect of this application, a rotor assembly is provided, comprising: a guide ring having a first flow channel;

[0006] The rotor core has a flow guide ring disposed at its end to facilitate the flow of cooling medium from the first flow channel through the rotor core and / or from the rotor core through the first flow channel.

[0007] According to a second aspect of this application, an electric motor is provided, including the rotor assembly and stator assembly described above.

[0008] According to a third aspect of this application, a vehicle is also provided, including the rotor assembly described above or including the motor described above.

[0009] In the rotor assembly of this application embodiment, a guide ring is provided at the 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 flow of cooling medium. The cooling medium can flow through the first flow channel through the rotor core, 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 to the scheme of setting the flow channel in the middle of the rotor core, in this application, the rotor core only requires one set of rotor lamination molds, which requires less modification to the molds and has lower costs.

[0010] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0013] Figure 1 This is a schematic diagram of the overall structure of the rotor assembly provided in an exemplary embodiment of this application.

[0014] Figure 2 yes Figure 1 An enlarged schematic diagram of part A in the middle.

[0015] Figure 3 yes Figure 1 Cross-sectional view.

[0016] Figure 4 yes Figure 1 Further details of the cross-sectional view.

[0017] Figure 5 yes Figure 4 Enlarged schematic diagram of part B.

[0018] Figure 6 yes Figure 4 An enlarged schematic diagram of section C.

[0019] Figure 7 This is an exploded view of the rotor assembly provided in an exemplary embodiment of this application.

[0020] Figure 8 yes Figure 7 An enlarged schematic diagram of part D in the middle.

[0021] Figure 9 yes Figure 7 An enlarged schematic diagram of section E in the middle.

[0022] Figure 10 yes Figure 1 A schematic diagram of the structure of the rotor core, guide bars, and end rings.

[0023] Figure 11 yes Figure 10 Enlarged schematic diagram of section F in the middle.

[0024] Figure 12 yes Figure 1 A partial structural schematic diagram of the guide ring provided in an exemplary embodiment of this application.

[0025] Figure 13 yes Figure 12 An enlarged schematic diagram of section G in the middle.

[0026] Figure 14 yes Figure 1 A cross-sectional view of the guide ring provided in an exemplary embodiment of this application.

[0027] Figure 15 yes Figure 14 Enlarged schematic diagram of section H in the middle.

[0028] Figure 16 This is a schematic diagram of the rotor lamination provided in an exemplary embodiment of this application.

[0029] Figure 17 This is a schematic diagram of the rotor core provided in an exemplary embodiment of this application.

[0030] Figure 18 yes Figure 17 Enlarged schematic diagram of section I.

[0031] Figure 19 yes Figure 1 A schematic diagram of the structure of the guide bar and end ring.

[0032] Figure 20 yes Figure 19 An enlarged schematic diagram of section J in the middle.

[0033] Figure 21 yes Figure 19 An enlarged diagram of section K in the middle.

[0034] Figure 22 This is a schematic diagram of the flow channel of the cooling medium provided in an exemplary embodiment of this application.

[0035] Explanation of reference numerals in the attached figures:

[0036] 10. 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 protrusion; 121. Second groove; 13. Second seal; 14. First protrusion; 141. First groove; 15. Main body; 16. First seal; 17. First liquid guide groove; 171. First groove sidewall; 173. Groove bottom wall; 175. Second groove sidewall; 176. First groove internal space; 18. Second liquid guide groove; 181. First sub-wall; 183. Second sub-wall; 182. Third sub-wall; 184. Second groove 19. Internal space; 19. Third liquid guide groove; 191. Internal space of the third groove; 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 lamination; 31. Mounting groove; 32. Second flow channel; 33. Connecting channel; 34. First shaft hole; 35. End face of rotor core; 40. Guide bar; 50. End ring; 53. Liquid guide hole; 51. End ring protrusion; 54. Second shaft hole; 541. Hole wall; 60. Step mounting position; 70. Rotor pressure ring; 80. Oil guide channel; 90. Connecting wall; 91. Tooth; 92. Limiting groove. Detailed Implementation

[0037] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0038] The rotor core is an important component of an electric motor and is part of the motor's magnetic circuit. It is generally made by stamping and stacking rotor laminations of a certain thickness that are mutually insulated. The outer circle of the rotor laminations has evenly distributed slots for housing the rotor windings.

[0039] Excessive rotor core temperature 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, related technologies have set up flow channels in the middle of the rotor core so that the cooling medium passes through the rotor core and the heat is dissipated through the heat transfer between the cooling medium and the rotor core. This requires two sets of rotor lamination dies, resulting in a high overall cost.

[0040] To at least partially solve the aforementioned technical problems, according to the first aspect of this application, with reference to Figure 1 , Figure 2 , Figure 3 as well as Figure 4This application provides a rotor assembly. In some embodiments, the rotor assembly includes: a guide ring 10 with a first flow channel 11; and a rotor core 30. The guide ring 10 is disposed at the end of the rotor core 30 to facilitate the flow of cooling medium from the first flow channel 11 through the rotor core 30, 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 having a first flow channel 11 formed on the guide ring 10, the first flow channel 11 serves as a channel for the flow of cooling medium. 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 to the scheme of setting the flow channel in the middle of the rotor core 30, in this application, the rotor core 30 only requires one set of rotor lamination molds, resulting in minimal mold modifications and lower costs.

[0041] The guide ring 10 can be made of a low-strength material, such as plastic. The cooling medium can be oil. Cooling can be achieved as long as the cooling medium can flow from the first flow channel 11 through the rotor core 30, and / or from the rotor core 30 through the first flow channel 11.

[0042] Please combine Figure 16 The rotor core 30 is part of the motor magnetic circuit. It can be made into a cylindrical shape by stacking rotor laminations 36 and fitted onto the shaft. The rotor winding is embedded in the slot of the outer circle of the rotor core.

[0043] In some embodiments, the rotor core 30 is provided with a second flow channel 32 along its axial direction, and the first flow channel 11 is connected to the second flow channel 32. This arrangement allows the cooling medium to flow between the first flow channel 11 and the second flow channel 32, thereby enabling sufficient cooling of the rotor core 30 along its axial direction.

[0044] In some embodiments, the cooling medium can flow from the first flow channel 11 to the stator windings. This arrangement allows the cooling medium in the first flow channel 11 to cool the stator windings. This results in a lower stator winding temperature, improving the motor's cooling capacity and enabling stronger power output with the same cooling capacity.

[0045] Please combine Figure 7 , Figure 8 as well as Figure 9 In some embodiments, at least one end of the rotor core 30 is provided with a flow guide ring 10 along the axial direction of the rotor assembly. In some embodiments, there are two flow guide rings 10, which are respectively disposed at opposite ends of the rotor core 30 along the axial direction of the rotor assembly. The rotor core 30 is provided with a second flow channel 32 along the axial direction, and the second flow channel 32 is respectively connected to two first flow channels 11.

[0046] The cooling medium can enter the second flow channel 32 of the rotor core 30 through the first flow channel 11 of one guide ring 10, and then enter the first flow channel 11 of another guide ring 10. This allows for more complete axial contact with the rotor core 30, resulting in better heat exchange with the rotor core 30.

[0047] Please combine Figure 7 In some embodiments, the rotor assembly also includes a rotating shaft 20, a rotor core 30 and a flow guide ring 10, all of which are sleeved on the rotating shaft 20. The rotating shaft 20 has a rotating shaft flow channel 21, which is connected to the first flow channel 11.

[0048] The cooling medium flows through the shaft flow channel 21 of the shaft 20, enters the first flow channel 11 of a guide ring 10, enters the second flow channel 32 of the rotor core 30, enters the first flow channel 11 of another guide ring 10, and then flows out of the rotor assembly. After flowing out of the rotor assembly, the cooling medium can cool the stator windings.

[0049] In some embodiments, the rotating shaft 20 is further provided with a rotating shaft liquid outlet hole 24, which connects the rotating shaft flow channel 21 and the first flow channel 11.

[0050] The cooling medium can include a first cooling medium outlet 22 and a second cooling medium outlet 23. After entering the shaft flow channel 21, the cooling medium flows out of the shaft flow channel 21 through the cooling medium outlet 24.

[0051] In some embodiments, the shaft flow channel 21 extends along the axial direction of the shaft 20, and the shaft liquid outlet hole 24 includes a first liquid outlet hole 22 and a second liquid outlet hole 23 arranged along the axial direction of the shaft 20. The first liquid outlet hole 22 and the second liquid outlet hole 23 are respectively connected to the shaft flow channel 21, and the first liquid outlet hole 22 and the second liquid outlet hole 23 are respectively connected to the first flow channel 11 located at both ends of the rotor core 30 along the axial direction.

[0052] The direction from the first liquid outlet 22 to the second liquid outlet 23 can be a first direction, and the direction from the second liquid outlet 23 to the first liquid outlet 22 can be a second direction. The cooling medium can enter the shaft flow channel 21 from the end of the first liquid outlet 22 away from the second liquid outlet 23. The flow path of the cooling medium can be divided into the following paths:

[0053] A portion of the cooling medium may flow as follows: into the shaft flow channel 21, out of the shaft flow channel 21 from the first outlet hole 22, into the first flow channel 11 near the first outlet hole 22, into the second flow channel 32, into the first flow channel 11 near the second outlet hole 23, and out of the rotor assembly from the first flow channel 11 near the second outlet hole 23. The arrangement direction of the first flow channel 11 near the first outlet hole 22, the second flow channel 32, and the first flow channel 11 near the second outlet hole 23 is the first direction, and the overall flow direction of this portion of the cooling medium is also the first direction.

[0054] Another portion of the cooling medium can flow as follows: it flows into the shaft channel 21, along the first direction to the second outlet 23, into the first channel 11 near the second outlet 23, into the second channel 32, along the second direction through the second channel 32, into the first channel 11 near the first outlet 22, and finally out of the rotor assembly from the first channel 11 near the first outlet 22. This portion of the cooling medium enters the shaft channel 21 from the end of the first outlet 22 opposite to the second outlet 23, first flows along the first direction in the shaft to the second outlet 23, then enters the second channel 32 from the second outlet 23, and flows along the second direction in the second channel 32 into the first channel 11 near the first outlet 22, finally out of the rotor assembly from the first channel 11 near the first outlet 22. The two cooling media flow in opposite directions in the second channel 32, thus enabling more efficient heat dissipation for the rotor core 30.

[0055] Please combine Figure 5 In some embodiments, the first flow channel 11 includes a liquid cavity 111, and the guide ring 10 includes a main body 15 and a first protrusion 14. The main body 15 is sleeved on the rotating shaft 20, and the first protrusion 14 is connected to the side of the main body 15 facing the rotor core 30. A liquid cavity 111 is provided between the first protrusion 14 and the rotating shaft 20, and the liquid cavity 111 communicates with the rotating shaft flow channel 21.

[0056] A liquid cavity 111 is provided between the first protrusion 14 and the rotating shaft 20, so that the cooling medium can flow directly into the liquid cavity 111 after flowing out of the rotating shaft flow channel 21.

[0057] The cooling medium can enter the shaft flow channel 21 from the end of the first outlet hole 22 of the shaft away from the second outlet hole 23, flow out of the shaft flow channel 21 from the first outlet hole 22, and flow into the liquid chamber 111 of the first flow channel 11 near the first outlet hole 22. In the cross-section perpendicular to the axial direction of the guide ring 10, the first protrusion 14 can be annular.

[0058] In some embodiments, the rotor assembly further includes an end ring 50 for limiting the radial movement of the guide ring 10 along the rotor assembly. This arrangement allows the end ring 50 to provide radial protection for the guide ring 10, preventing damage to the guide ring 10 due to centrifugal force.

[0059] In some embodiments, the rotor assembly further includes an end ring 50, and the guide ring 10 includes a first seal 16 sandwiched between the end ring 50 and the first protrusion 14. This seals the space between the end ring 50 and the first protrusion 14 to prevent leakage of the cooling medium. The first seal 16 may be a sealing ring.

[0060] In some embodiments, the first protrusion 14 has a first groove 141 on the side opposite to the rotating shaft 20, and the first seal 16 is installed in the first groove 141. This ensures that the first seal 16 is confined within the first groove 141, preventing it from moving and maintaining good sealing performance.

[0061] In some embodiments, the first flow channel 11 includes a first sub-flow channel 113, and the main body 15 has the first sub-flow channel 113, which communicates with the liquid chamber 111. 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 chamber 111 near the first flow channel 11 of the first liquid outlet 22, and flow into the first sub-flow channel 113.

[0062] In some embodiments, the guide ring 10 includes a second protrusion 12 connected to the side of the main body 15 facing the rotor core 30. The second protrusion 12 is located between the rotating shaft 20 and the first protrusion 14, and the second protrusion 12 and the first protrusion 14 form a liquid cavity 111.

[0063] A liquid cavity 111 is provided between the second protrusion 12 and the first protrusion 14, allowing the cooling medium to flow directly into the liquid cavity 111 after exiting the shaft flow channel 21. The second protrusion 12 can be ring-shaped around the outer periphery of the shaft 20, and can also be used to position the shaft 20 during installation. It also limits the shaft during operation to prevent wobbling. In a cross-section perpendicular to the axial direction of the guide ring 10, the second protrusion 12 can be annular.

[0064] In some embodiments, the second protrusion 12 is sealed to the outer peripheral side of the shaft 20. This prevents the cooling medium from leaking between the second protrusion 12 and the shaft 20.

[0065] In some embodiments, the guide ring 10 includes a second seal 13, which is sandwiched between the rotating shaft 20 and the second protrusion 12. The second seal 13 may be a sealing ring. The second seal 13 sandwiched between the rotating shaft 20 and the second protrusion 12 provides good sealing performance between the rotating shaft 20 and the second protrusion 12.

[0066] In some embodiments, the second protrusion 12 has a second groove 121 on the side facing the rotating shaft 20, and the second seal 13 is installed in the second groove 121. This ensures that the second seal 13 is confined within the second groove 121, preventing it from moving and maintaining good sealing performance.

[0067] In this application, the processing technology is simple and the assembly process is easy. By setting the second sealing element 13 and the first sealing element 16, the reliability of the seal is increased, so that the cooling medium is not easy to leak under high-speed operation.

[0068] In some embodiments, the first flow channel 11 includes a first sub-flow channel 113, the first sub-flow channel 113 includes a first groove space 176, the portion of the main body 15 located between the first protrusion 14 and the second protrusion 12 is axially recessed with the first groove space 176, and the first groove space 176 communicates with the liquid cavity 111.

[0069] The cooling medium can enter the shaft flow channel 21 from the end of the first outlet hole 22 of the shaft away from the second outlet hole 23, flow out of the shaft flow channel 21 from the first outlet hole 22, flow into the liquid cavity 111 of the first flow channel 11 near the first outlet hole 22, and flow into the first groove space 176 of the first sub-flow channel 113. The first groove space 176 and the liquid cavity 111 can be arranged along the axial direction of the main body 15.

[0070] Please combine Figure 12 as well as Figure 13 In some embodiments, the main body 15 includes a first liquid guiding groove 17, which includes a first groove sidewall 171, a groove bottom wall 173, and a second groove sidewall 175 connected in sequence. The first liquid guiding groove 17 is provided with a first groove inner space 176. The second groove sidewall 175 is located on the side of the first groove sidewall 171 away from the rotating shaft 20. A second protrusion 12 is connected to the first groove sidewall 171, and a first protrusion 14 is connected to the second groove sidewall 175.

[0071] The second protrusion 12 is connected to the first groove sidewall 171, and the first protrusion 14 is connected to the second groove sidewall 175, thereby enabling the first groove space 176 to communicate with the liquid chamber 111. Cooling medium can flow from the liquid chamber 111 into the first groove space 176. The first groove sidewall 171 and the second groove sidewall 175 can be arranged radially along the main body 15.

[0072] Please combine Figure 14 as well as Figure 15 In some embodiments, the first sub-channel 113 includes a second groove space 184, and the second groove sidewall 175 is recessed in the direction of radial outward of the main body 15 to form the second groove space 184.

[0073] The cooling medium can enter the shaft flow channel 21 from the end of the first liquid outlet 22 of the shaft away from the second liquid outlet 23, flow out of the 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 tank space 176 of the first sub-flow channel 113, and flow into the second tank space 184.

[0074] The second groove sidewall 175 is recessed in a radially outward direction along the main body 15, providing a second groove inner space 184. This ensures that the second groove inner space 184 is located outside the first groove inner space 176. The second groove inner space 184 and the first groove inner space 176 are arranged radially along the main body 15.

[0075] In some embodiments, the main body 15 includes a second liquid guiding groove 18, the second liquid guiding groove 18 is provided with a second groove space 184, the second liquid guiding 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, the third sub-wall 182 being disposed opposite to the first groove sidewall 171.

[0076] In some embodiments, the first sub-channel 113 further includes a third inner space 191, and the third sub-wall 182 is recessed radially outward along the main body 15 to form the third inner space 191. The main body 15 includes a third liquid guiding channel 19, and the third liquid guiding channel 19 is provided with the third inner space 191.

[0077] The cooling medium enters the shaft flow channel 21 from the end of the shaft opposite to the second outlet 23 through the first outlet 22, flows out of the shaft flow channel 21 through the first outlet 22, flows into the liquid chamber 111 of the first flow channel 11 near the first outlet 22, flows into the first groove space 176 of the first sub-flow channel 113, flows into the second groove space 184, and flows into the third groove space 191. The third groove space 191 and the second groove space 184 can be arranged radially along the main body 15. The first groove space 176, the second groove space 184, and the third groove space 191 can be arranged radially along the main body 15 in sequence. The third groove space 191 has an oil collecting function, which can collect a portion of the cooling medium.

[0078] In some embodiments, there are multiple third tank spaces 191, which are distributed circumferentially along the main body 15. This allows the third tank spaces 191 to collect more cooling medium.

[0079] In some embodiments, the main body 15 has a first opening 115 on the side facing the rotor core 30, and the first opening 115 connects the third groove space 191 and the second flow channel 32. The cooling medium can enter the shaft flow channel 21 from the end of the first liquid outlet 22 of the shaft away from the second liquid outlet 23, flow out of the 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 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. Part of the cooling medium entering the third groove space 191 can be collected in the third groove space 191, and part can flow from the first opening 115 to the second flow channel 32.

[0080] In some embodiments, there are multiple first openings 115, and each first opening 115 corresponds to a third groove space 191. In this way, the cooling medium in multiple third groove spaces 191 can flow out from multiple first openings 115 simultaneously, thereby improving the cooling efficiency of the cooling medium.

[0081] In some embodiments, the third sub-wall 182 further includes a plurality of connecting walls 90, which are arranged along the circumference of the main body 15, with any two adjacent third tank spaces 191 spaced apart by a connecting wall 90. The connecting walls 90 facilitate the collection of cooling medium within the third tank spaces 191.

[0082] Please combine Figure 6 In some embodiments, the first flow channel 11 further includes a second sub-flow channel 117. A connecting wall 90 has a second sub-flow channel 117, one end of which extends away from the side of 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 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 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. A portion of the cooling medium entering the third tank space 191 can be collected within the third tank space 191, while another portion can flow from the first opening 115 to the second flow channel 32, and from the second flow channel 32 into the second sub-flow channel 117 of the first flow channel 11 near the second liquid outlet 23. The medium then flows out of the rotor assembly via the second sub-flow channel 117 and into the stator windings, thereby cooling the stator windings. The second sub-flow channel 117 extends radially along the main body 15.

[0083] In some embodiments, the end of the second sub-channel 117 near the shaft 20 is blocked. This allows the cooling medium flowing into the second sub-channel 117 to flow out of the rotor assembly and into the stator windings. The second sub-channel 117 extends radially along the main body 15. The end of the second sub-channel 117 near the shaft 20 is blocked, meaning the end of the second sub-channel 117 near the first sub-channel 113 is blocked. Cooling medium will not flow from the second sub-channel 117 into the first sub-channel 113.

[0084] In some embodiments, the connecting wall 90 has a second opening 116, which connects the second sub-channel 117 and the second channel 32. Cooling medium can enter the shaft channel 21 from the end of the first outlet hole 22 of the shaft opposite to the second outlet hole 23, flow out of the shaft channel 21 from the first outlet hole 22, flow into the liquid cavity 111 of the first channel 11 near the first outlet hole 22, flow into the first groove space 176 of the first sub-channel 113, flow into the second groove space 184, and flow into the third groove space 191. A portion of the cooling medium entering the third groove space 191 can be collected in the third groove space 191, while a portion can flow from the first opening 115 to the second channel 32, and then from the second opening 116 into the second sub-channel 117 of the first channel 11 near the second outlet hole 23. It then flows out of the rotor assembly via the second sub-channel 117 and into the stator winding, thereby cooling the stator winding.

[0085] In some embodiments, multiple connecting walls 90 extend radially outward along the main body 15, forming multiple teeth 91. A limiting groove 92 is formed between any two adjacent teeth 91. The rotor assembly also includes an end ring 50, which has multiple end ring protrusions 51 facing the guide ring 10. The end ring protrusions 51 are mounted in the limiting groove 92, and at least two end ring protrusions 51 are arranged radially along the guide ring 10. This arrangement provides radial protection for the guide ring 10, preventing damage to the guide ring 10 due to centrifugal force.

[0086] Because the end ring protrusion 51 and the limiting groove 92 are connected by a concave-convex fit, the structure between the guide ring 10 and the end ring 50 is compact, resulting in a smaller axial length of the rotor assembly.

[0087] In some embodiments, the rotor assembly further includes a guide bar 40 mounted on the rotor core 30, and the first flow channel 11 communicates with the guide bar 40.

[0088] The rotor winding of the rotor assembly can be a squirrel-cage type rotor winding: when the rotor core 30 is removed, the shape of the entire rotor winding is close to that of a squirrel cage.

[0089] Currently, electric drive products are developing towards higher speeds and higher efficiency. Asynchronous motors are relatively less efficient than synchronous motors, mainly due to the greater losses in the rotor squirrel cage. Rotor squirrel cage losses are positively correlated with temperature; the greater the losses and the higher the temperature, the lower the efficiency. The rotor squirrel cage consists of guide bars running through the rotor core and end rings at both ends of the guide bars, with several guide bars arranged circumferentially. The additional losses of the cast aluminum rotor are proportional to the resistance of the guide bars. Since the resistance of the guide bars increases with temperature, the motor's losses increase with temperature during operation, and its efficiency decreases, affecting the normal operation of the motor and even the vehicle's driving range. At the same time, the strength of the guide bars and end rings decreases with increasing temperature, posing a safety hazard when the motor operates at high speeds.

[0090] The rotor assembly proposed in this application can directly cool the conductor bars, providing excellent cooling. It can also cool the end rings, rotor core, and stator windings. The oil circuit structure is complete, the cooling medium utilization rate is high, the cooling speed is accelerated, and the heat dissipation efficiency is improved.

[0091] Please combine Figure 17 as well as Figure 18 In some embodiments, the rotor core 30 is provided with a mounting groove 31, which extends through the rotor core 30 along its axial direction. (Please refer to...) Figure 19 The guide bar 40 is located in the mounting groove 31, which is connected to the second flow channel 32.

[0092] The cooling medium enters the shaft flow channel 21 through the end of the shaft opposite to the second outlet 23 via the first outlet 22, flows out of the shaft flow channel 21 via the first outlet 22, flows into the liquid chamber 111 of the first flow channel 11 near the first outlet 22, flows into the first groove space 176 of the first sub-flow channel 113, flows into the second groove space 184, and flows into the third groove space 191. Part of the cooling medium entering the third groove space 191 can be collected there, while another part can flow through the first opening 115 to the second flow channel 32 and then to the mounting groove 31. This arrangement allows the cooling medium to directly cool the guide bars in the mounting groove from the second flow channel, resulting in good cooling performance.

[0093] It is easy to understand that the cooling efficiency of the cooling structure determines the performance, reliability, and upper limit of the motor's insulation life. The rotor assembly of this application can be the rotor assembly of an asynchronous motor. By directly cooling the guide bars in the rotor assembly, the efficiency and strength of the motor at high speeds can be improved, thereby increasing the vehicle's range and maximum speed, and achieving the goals of cost reduction, efficiency improvement, speed increase, and performance enhancement for asynchronous motors.

[0094] In some embodiments, the rotor core 30 is provided with mounting slots 31, each slot 31 containing a copper or aluminum conductor bar as a rotor conductor. The two ends of the conductor bar are short-circuited with end rings to form a closed loop. In some examples, during manufacturing, bare copper bars are inserted into the mounting slots 31 of the rotor core 30, and then end rings are fitted onto the ends of the copper bars and welded together. In some examples, the stacked rotor core 30 can be cast in an aluminum mold during manufacturing.

[0095] In some embodiments, there are multiple mounting slots 31, which are arranged circumferentially along the rotor core 30.

[0096] In some embodiments, there are multiple second flow channels 32, and one second flow channel 32 is connected to a mounting groove 31. This allows for cooling of the guide bars in the multiple mounting grooves 31 respectively, improving cooling efficiency.

[0097] In some embodiments, the rotor core 30 is further provided with a connecting channel 33 for connecting the mounting slot 31 and the second flow channel 32.

[0098] The cooling medium can enter the shaft flow channel 21 from the end of the shaft opposite to the second outlet 23 through the first outlet 22, flow out of the shaft flow channel 21 through the first outlet 22, flow into the liquid chamber 111 of the first flow channel 11 near the first 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. Part of the cooling medium entering the third slot space 191 can be collected in the third slot space 191, and part can flow from the first opening 115 to the second flow channel 32, the connecting channel 33, and the mounting slot 31.

[0099] In some embodiments, the connecting channel 33 extends through the rotor core 30 along the axial direction of the rotor core 30.

[0100] It can cool the guide bars along the axial direction of the rotor core 30, thereby improving cooling efficiency.

[0101] In some embodiments, there are multiple connecting channels 33 and multiple mounting slots 31, with one connecting channel 33 used to connect one mounting slot 31 to a second flow channel 32. This facilitates cooling of the guide bars in the multiple mounting slots 31 respectively, improving cooling efficiency.

[0102] In some embodiments, the width of the connecting channel 33 is less than the minimum width of the mounting groove 31 in a cross section perpendicular to the axial direction of the rotor core 30. This facilitates the distinction between 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, followed by demolding and debris removal, this design is beneficial for demolding and debris removal.

[0103] In some embodiments, the second flow channel 32 is located radially inside the rotor core 30 relative to the mounting groove 31. The cooling medium can simultaneously and adequately cool both the guide bar 40 and the rotor core 30.

[0104] In some embodiments, the rotor assembly further includes an end ring 50, which is connected to the end of the guide bar 40 and located at the end of the rotor core 30.

[0105] The rotor assembly also includes an end ring 50, which is connected to the end of the guide bar 40, thus forming a rotor squirrel cage structure. The end ring 50, guide bar 40, and rotor core 30 can be machined by casting. During assembly, the end ring 50, guide bar 40, and rotor core 30 can be machined and installed first, then the shaft 20 is installed, the rotor pressure ring 70 is pressed in, and then the second seal 13, the first seal 16, and the guide ring 10 are installed to complete the assembly of the entire rotor assembly.

[0106] Please combine Figure 20 as well as Figure 21 In some embodiments, the end ring 50 is provided with a liquid guiding hole 53, which connects 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 connects the first flow channel 11 and the second flow channel 32, thereby allowing the cooling medium to 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 machined using a mold.

[0107] Specifically, the cooling medium can enter the shaft flow channel 21 from the end of the first outlet hole 22 of the shaft away from the second outlet hole 23, flow out of the shaft flow channel 21 from the first outlet hole 22, flow into the liquid chamber 111 of the first flow channel 11 near the first 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. Part of the cooling medium entering the third groove space 191 can be collected in the third groove space 191, and part of it can flow from the first opening 115 into the guide hole 53 into the second flow channel 32, and then flow from the second opening 116 into the second sub-flow channel 117 of the first flow channel 11 near the second outlet hole 23, and then flow out of the rotor assembly through the second sub-flow channel 117, completing the oil throwing to the stator winding and completing the cooling of the stator winding.

[0108] Please combine Figure 10 as well as Figure 11 In some embodiments, the rotor assembly further includes a shaft 20, the rotor core 30 having a first shaft hole 34 through which the shaft 20 passes, and the end ring 50 having a second shaft hole 54 through which the shaft passes. The diameter of the second shaft hole 54 is larger than the diameter of the first shaft hole 34. This facilitates the installation of the shaft.

[0109] In some embodiments, the bore wall 541 of the second shaft hole 54 forms a stepped mounting position 60 with the end face 35 of the rotor core. The rotor assembly also includes a rotor pressure 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.

[0110] In some embodiments, the rotor pressure ring 70 has an oil channel 80 between its end face away from the rotor core 30 and the guide ring 10, and the rotating shaft 20 has a shaft flow channel 21. The oil channel 80 is connected to the shaft flow channel 21 and the first flow channel 11. The cooling medium can pass through the shaft flow channel 21, the oil channel 80, the first flow channel 11, and the second flow channel 32, thereby cooling the rotor pressure ring 70.

[0111] Specifically, the cooling medium can enter the shaft flow channel 21 from the end of the first outlet hole 22 of the shaft away from the second outlet hole 23, flow out of the shaft flow channel 21 from the first outlet hole 22, flow into the oil guide channel 80, flow into the liquid chamber 111 of the first flow channel 11 near the first 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. Part of the cooling medium entering the third slot space 191 can be collected in the third slot space 191, and part can flow from the first opening 115 to the second flow channel 32, and then flow from the second opening 116 into the second sub-flow channel 117 of the first flow channel 11 near the second outlet hole 23, and then flow out of the rotor assembly via the second sub-flow channel 117 to the stator winding.

[0112] Figure 22 The diagram illustrates the flow channel structure of the cooling medium provided in an exemplary embodiment of this application. Figure 22 The structure within is not the structure of a solid entity, but rather the morphology of each flow channel. For example, Figure 22 The diagram shows the rotating shaft flow channel 21, the second flow channel 32, etc.

[0113] In some embodiments, at least a portion of the end ring 50 protrudes beyond the rotor pressure ring 70 along the axial direction of the shaft.

[0114] Because the rotor pressure ring 70 is installed at the stepped mounting position 60, at least part of the end ring 50 protrudes from the rotor pressure ring 70, and the cooling medium in the oil guide channel 80 can directly cool the end ring 50. This solves the problem of reduced strength of the guide bar and end ring due to high temperature, allowing the motor to reach higher speeds and operate more safely at high speeds.

[0115] In some embodiments, a portion of the guide ring 10 is mounted at the stepped mounting position 60.

[0116] In some embodiments, at least a portion of the second protrusion 12 may be located at the stepped mounting position 60 and abut against the bore wall 541 of the second shaft bore 54. This results in a smaller axial length of the rotor assembly.

[0117] 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 to limit the radial movement of the guide ring 10 along the rotor assembly. This arrangement allows the first limiting portion to provide radial protection for the guide ring 10, preventing the guide ring 10 from being damaged by centrifugal force.

[0118] In some embodiments, the limiting portion includes an end ring protrusion 51, and the mating portion includes a limiting groove 92. The end ring protrusion 51 and the limiting groove 92 are mated and connected to limit the radial movement of the guide ring 10 along the rotor assembly. This arrangement provides radial protection for the guide ring 10, preventing damage due to centrifugal force. Because the end ring protrusion 51 and the limiting groove 92 are mated through a convex-concave fit, the structure between the guide ring 10 and the end ring 50 is compact, resulting in a smaller axial length of the rotor assembly.

[0119] This application enables all-round cooling of the rotor assembly, improves the cooling efficiency of the cooling medium, and has the advantages of low modification cost, good cooling effect, and high feasibility.

[0120] The motor described in this application has a compact structure, smaller size, higher torque or power density, and higher motor and cooling efficiency, which can meet the requirements of high speed, high efficiency, and low cost for electric drive systems. It also offers lower cost.

[0121] 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. The rotor core 30 is provided with a second flow channel 32 along its axial direction. The second flow channel 32 is respectively connected to two first flow channels 11. The rotor assembly also 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. 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 connected to the rotating shaft flow channel 21. The first liquid outlet hole 22 and the second liquid outlet hole 23 are respectively connected to the first flow channels 11 located at both ends of the rotor core 30 along its axial direction. The cooling medium can enter the shaft flow channel 21 from the end of the first outlet hole 22 of the shaft away from the second outlet hole 23, flow out of the shaft flow channel 21 from the first outlet hole 22, flow into the first flow channel 11 near the first outlet hole 22, and a portion can enter the second flow channel 32 and flow out of the rotor assembly.

[0122] According to a second aspect of this application, an electric motor is provided, comprising the rotor assembly and stator assembly described above. This motor possesses all the beneficial effects of the aforementioned minimal protection subject matter, which will not be elaborated further herein.

[0123] This application improves motor efficiency and increases the vehicle's driving range. It also reduces motor costs, achieving the effects of increased efficiency, speed, and performance.

[0124] The motor described in this 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, consisting of a frame, a stator core, and stator windings. The rotor assembly is the rotating part of the motor, and its shaft is generally made of medium carbon steel, serving to support and fix the rotor core and transmit power.

[0125] According to a third aspect of this application, a vehicle is provided that includes the aforementioned rotor assembly or the aforementioned motor. The vehicle possesses all the beneficial effects of the aforementioned rotor assembly or motor, which will not be elaborated further herein.

[0126] The vehicle may be a gasoline-powered vehicle, a plug-in hybrid electric vehicle, or a new energy vehicle, etc., and this application does not make any specific restrictions.

[0127] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0128] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0129] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0130] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any modifications, equivalent changes, or alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A rotor assembly, characterized in that, include: The flow guide ring has a first flow channel; The rotor core has a second flow channel and a mounting groove in its axial direction. The mounting groove is connected to the second flow channel. The guide ring is disposed at the end of the rotor core. The first flow channel is connected to the second flow channel so that the cooling medium can flow from the first flow channel through the second flow channel of the rotor core, and / or flow from the second flow channel of the rotor core through the first flow channel. The guide bar is located within the mounting slot; as well as An end ring is located at the end of the rotor core and between the guide ring and the rotor core. The end ring has a limiting part, and the guide ring has a mating part. The mating part is connected to the limiting part to limit the radial movement of the guide ring along the rotor assembly.

2. The rotor assembly according to claim 1, characterized in that, The cooling medium can flow from the first flow channel to the stator winding.

3. The rotor assembly according to claim 1, characterized in that, Along the axial direction of the rotor assembly, at least one end of the rotor core is provided with the flow guide ring.

4. The rotor assembly according to claim 1, characterized in that, There are two flow guide rings, which are arranged along the axial direction of the rotor assembly at opposite ends of the rotor core. The second flow channel is connected to the two first flow channels respectively.

5. The rotor assembly according to claim 4, characterized in that, The rotor assembly also includes a rotating shaft, and the rotor core and the guide ring are both sleeved on the rotating shaft. The rotating shaft has a rotating shaft flow channel, and the rotating shaft flow channel is connected to the first flow channel.

6. The rotor assembly according to claim 5, characterized in that, The rotating shaft is also provided with a rotating shaft liquid outlet hole, which connects the rotating shaft flow channel and the first flow channel.

7. The rotor assembly according to claim 6, characterized in that, The shaft flow channel extends along the axial direction of the shaft, and the shaft outlet hole includes a first outlet hole and a second outlet hole arranged along the axial direction of the shaft. The first outlet hole and the second outlet hole are respectively connected to the shaft flow channel, and the first outlet hole and the second outlet hole are respectively connected to the first flow channel located at both ends of the rotor core along the axial direction.

8. The rotor assembly according to claim 5, characterized in that, The first flow channel includes a liquid cavity, and the flow guide ring includes a main body and a first protrusion. The main body is sleeved on the rotating shaft, and the first protrusion is connected to the side of the main body facing the rotor core. The liquid cavity is provided between the first protrusion and the rotating shaft, and the liquid cavity communicates with the flow channel of the rotating shaft.

9. The rotor assembly according to claim 8, characterized in that, The guide ring includes a first sealing element, which is sandwiched between the end ring and the first protrusion.

10. The rotor assembly according to claim 9, characterized in that, The first protrusion has a first groove on the side opposite to the rotating shaft, and the first seal is installed in the first groove.

11. The rotor assembly according to claim 8, characterized in that, The first flow channel includes a first sub-flow channel, and the main body has the first sub-flow channel, which is connected to the liquid cavity.

12. The rotor assembly according to claim 8, characterized in that, The flow guide ring includes a second protrusion, which is connected to the side of the main body facing the rotor core. The second protrusion is located between the rotating shaft and the first protrusion, and the second protrusion and the first protrusion form the liquid cavity.

13. The rotor assembly according to claim 12, characterized in that, The second protrusion is sealed to the outer peripheral side of the rotating shaft.

14. The rotor assembly according to claim 12, characterized in that, The guide ring includes a second seal, which is sandwiched between the rotating shaft and the second protrusion.

15. The rotor assembly according to claim 14, characterized in that, The second protrusion has a second groove on the side facing the rotating shaft, and the second seal is installed in the second groove.

16. The rotor assembly according to claim 12, characterized in that, The first flow channel includes a first sub-flow channel, the first sub-flow channel includes a first groove space, and the portion of the main body located between the first protrusion and the second protrusion is recessed along the axial direction with the first groove space, the first groove space being in communication with the liquid cavity.

17. The rotor assembly according to claim 16, characterized in that, The main body includes a first liquid guiding groove, which includes a first groove sidewall, a groove bottom wall, and a second groove sidewall connected in sequence. The first liquid guiding groove has a first groove inner space. The second groove sidewall is located on the side of the first groove sidewall away from the rotating shaft. The second protrusion is connected to the first groove sidewall, and the first protrusion is connected to the second groove sidewall.

18. The rotor assembly according to claim 17, characterized in that, The first sub-channel includes a second groove space, and the second groove space is recessed in the sidewall of the second groove in a radially outward direction along the main body.

19. The rotor assembly according to claim 18, characterized in that, The main body includes a second liquid guiding groove, which has a second groove space. The second liquid guiding groove includes a first sub-wall and a second sub-wall arranged axially along the rotating shaft, and a third sub-wall connected between the first sub-wall and the second sub-wall. The third sub-wall is disposed opposite to the side wall of the first groove.

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

21. The rotor assembly according to claim 20, characterized in that, The third groove contains multiple spaces, which are distributed at intervals along the circumference of the main body.

22. The rotor assembly according to claim 21, characterized in that, The main body has a first opening on the side facing the rotor core, and the first opening connects the space inside the third slot with the second flow channel.

23. The rotor assembly according to claim 22, characterized in that, There are multiple first openings, and each first opening corresponds to a space in the third groove.

24. The rotor assembly according to claim 20, characterized in that, The third sub-wall also includes multiple connecting walls, which are spaced apart along the circumference of the main body, with any two adjacent spaces in the third groove separated by one of the connecting walls.

25. The rotor assembly according to claim 24, characterized in that, The first flow channel further includes a second sub-flow channel, and a second sub-flow channel is provided in one of the connecting walls. One end of the second sub-flow channel extends along a side away from the rotating shaft so that the cooling medium can flow from the second sub-flow channel to the stator winding.

26. The rotor assembly according to claim 25, characterized in that, The second sub-channel is blocked at one end near the rotating shaft.

27. The rotor assembly according to claim 25, characterized in that, The connecting wall has a second opening, which connects the second sub-channel and the second channel.

28. The rotor assembly according to claim 24, characterized in that, Multiple connecting walls extend radially outward from the main body to form multiple teeth, and a limiting groove is formed between any two adjacent teeth. The end ring is provided with multiple end ring protrusions on the side facing the guide ring. The end ring protrusions are installed in the limiting groove, and at least two end ring protrusions are arranged radially along the guide ring.

29. The rotor assembly according to any one of claims 1 to 28, characterized in that, The mounting groove extends through the rotor core along its axial direction and is connected to the second flow channel.

30. The rotor assembly according to claim 29, characterized in that, There are multiple mounting slots, which are arranged circumferentially along the rotor core.

31. The rotor assembly according to claim 30, characterized in that, There are multiple second flow channels, and one of the second flow channels is connected to one of the mounting slots.

32. The rotor assembly according to claim 29, characterized in that, The rotor core is also provided with a connecting channel, which is used to connect the mounting slot and the second flow channel.

33. The rotor assembly according to claim 32, characterized in that, The connecting channel extends through the rotor core along its axial direction.

34. The rotor assembly according to claim 32, characterized in that, There are multiple connection channels and multiple mounting slots. One of the connection channels is used to connect one of the mounting slots with a second flow channel.

35. The rotor assembly according to claim 32, characterized in that, In a cross section perpendicular to the axial direction of the rotor core, the width of the connecting channel is less than the minimum width of the mounting slot.

36. The rotor assembly according to claim 32, characterized in that, The second flow channel is located radially inside the rotor core relative to the mounting slot.

37. The rotor assembly according to any one of claims 1 to 28, characterized in that, The end ring is connected to the end of the guide bar.

38. The rotor assembly according to claim 37, characterized in that, The end ring is provided with a liquid guiding hole, which is used to connect the first flow channel and the second flow channel.

39. The rotor assembly according to claim 37, characterized in that, The rotor assembly also includes a rotating shaft. The rotor core has a first shaft hole through which the rotating shaft passes, and the end ring has a second shaft hole through which the rotating shaft passes. The diameter of the second shaft hole is larger than the diameter of the first shaft hole.

40. The rotor assembly according to claim 39, characterized in that, The wall of the second shaft hole forms a stepped mounting position with the end face of the rotor core. The rotor assembly also includes a rotor pressure ring, which is sleeved on the rotating shaft and installed in the stepped mounting position.

41. The rotor assembly according to claim 40, characterized in that, The rotor pressure ring has an oil guide channel between its end face away from the rotor core and the guide ring. The rotating shaft has a rotating shaft flow channel, and the oil guide channel is connected to the rotating shaft flow channel and the first flow channel respectively.

42. The rotor assembly according to claim 40, characterized in that, Along the axial direction of the shaft, at least a portion of the end ring protrudes from the rotor pressure ring.

43. The rotor assembly according to claim 40, characterized in that, Part of the flow guide ring is installed at the stepped mounting position.

44. The rotor assembly according to any one of claims 1 to 28, characterized in that, The limiting part includes an end ring protrusion, and the mating part includes a limiting groove. The end ring protrusion and the limiting groove are mated and connected to limit the radial movement of the guide ring along the rotor assembly.

45. The rotor assembly according to any one of claims 1 to 28, characterized in that, There are two flow guide rings along the axial direction of the rotor assembly. The two flow guide rings are respectively disposed at opposite ends of the rotor core. The rotor core has a second flow channel along its axial direction, and the second flow channel is respectively connected to the two first flow channels. The rotor assembly also includes a rotating shaft, which has 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, and 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 connected to the rotating shaft flow channel, and the first liquid outlet hole and the second liquid outlet hole are respectively connected to the first flow channel located at both ends of the rotor core along the axial direction.

46. ​​An electric motor, characterized in that, Includes the rotor assembly and stator assembly as described in any one of claims 1-45.

47. A vehicle, characterized in that, It includes the rotor assembly as described in any one of claims 1-45 or the motor as described in claim 46.

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