Rotor assembly of an electric machine and electric machine

Abstract

The utility model discloses a rotor assembly of motor and motor, the utility model relates to motor technical field, and rotor assembly includes: rotor core is sleeved in the outer wall of rotating shaft, and rotating shaft forms the first axial oil cooling channel and first radial oil cooling channel of intercommunication, and rotor core forms the second axial oil cooling channel and second radial oil cooling channel of intercommunication, and the outer wall surface of rotating shaft and the inner wall of rotor core form intercommunication channel, and intercommunication channel is annular and sets up along the circumferential of rotating shaft and surrounds rotating shaft, and first radial oil cooling channel and second radial oil cooling channel all are opposite to set up with intercommunication channel to make intercommunication channel intercommunication first radial oil cooling channel and second radial oil cooling channel. Therefore, when assembling rotor core and rotating shaft, first radial oil cooling channel and second radial oil cooling channel do not need to be aligned and positioned one by one, and the number of first radial oil cooling channel and second radial oil cooling channel does not need to keep consistent, and the manufacturing and assembly difficulty of rotor assembly is reduced.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, and in particular to a rotor assembly and a motor. Background Technology

[0002] In related technologies, an electric motor is a device that converts electrical energy into mechanical energy. During continuous rotation, the rotor structure of an electric motor generates a large amount of heat, making it susceptible to overheating that can affect the motor's performance, lifespan, and stability. Therefore, cooling of the rotor structure is necessary. However, the rotor assembly structure of existing electric motors is complex and difficult to manufacture, leading to complicated installation procedures. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. Therefore, one objective of this invention is to provide a rotor assembly for an electric motor with a simple structure. During assembly, the rotor core and shaft do not require the circumferential alignment and positioning of the first and second radial oil cooling channels, greatly reducing the manufacturing and assembly difficulty of the rotor assembly.

[0004] This invention further proposes a motor having the above-mentioned rotor assembly.

[0005] According to an embodiment of the present invention, a rotor assembly of a motor includes a rotating shaft and a rotor core. The rotor core is sleeved on the outer peripheral wall of the rotating shaft. The rotating shaft forms a first axial oil cooling channel and a first radial oil cooling channel. The rotor core forms a second axial oil cooling channel and a second radial oil cooling channel. A connecting channel is formed between the outer wall of the rotating shaft and the inner peripheral wall of the rotor core. The connecting channel is annular and is arranged around the rotating shaft along the circumference. Along the radial direction of the rotating shaft, the first radial oil cooling channel and the second radial oil cooling channel are both arranged opposite to the connecting channel so that the connecting channel connects the first radial oil cooling channel and the second radial oil cooling channel.

[0006] According to an embodiment of the present invention, the rotor assembly of the motor has a connecting channel formed between the outer wall of the rotating shaft and the inner peripheral wall of the rotor core. The connecting channel is annular and arranged around the rotating shaft in the circumferential direction. In the radial direction of the rotating shaft, the first radial oil cooling channel and the second radial oil cooling channel are both arranged opposite to the connecting channel, so that the connecting channel connects the first radial oil cooling channel and the second radial oil cooling channel. This eliminates the need to align and position the first radial oil cooling channel and the second radial oil cooling channel one by one in the circumferential direction when assembling the rotor core and the rotating shaft, and the number of the first radial oil cooling channel and the second radial oil cooling channel does not need to be consistent. The structure is simple and greatly reduces the manufacturing and assembly difficulty of the rotor assembly.

[0007] According to some embodiments of the present invention, a first annular groove is formed on the outer peripheral wall of the rotating shaft, and the rotating shaft and the rotor core form a communication channel through the first annular groove.

[0008] According to some embodiments of the present invention, the end of the first radial oil cooling channel away from the first axial oil cooling channel extends to the bottom wall of the first annular groove, so that the first annular groove communicates with the first radial oil cooling channel.

[0009] According to some embodiments of the present invention, a second annular groove is formed on the inner peripheral wall of the rotor core facing the rotating shaft, and the rotating shaft and the rotor core form a communication channel through the second annular groove.

[0010] According to some embodiments of the present invention, the end of the second radial oil cooling channel away from the second axial oil cooling channel extends to the bottom wall of the second annular groove, so that the second annular groove communicates with the second radial oil cooling channel.

[0011] According to some embodiments of the present invention, the rotor core includes a plurality of rotor laminations, which are arranged sequentially along the axial direction of the shaft to form the rotor core. The plurality of rotor laminations form a first rotor lamination portion, a second rotor lamination portion, and a third rotor lamination portion. The second rotor lamination portion is located between the first rotor lamination portion and the third rotor lamination portion. The inner diameter of the second rotor lamination portion is larger than the inner diameters of the first rotor lamination portion and the third rotor lamination portion, so that the first rotor lamination portion, the second rotor lamination portion, and the third rotor lamination portion together define a second annular groove.

[0012] According to some embodiments of the present invention, there are multiple first radial oil cooling channels, which are arranged sequentially along the circumference of the rotating shaft, and the connecting channel is connected to all of the multiple first radial oil cooling channels.

[0013] According to some embodiments of the present invention, the second axial oil cooling channel includes two sub-oil cooling channels along the axial direction of the rotating shaft. The two sub-oil cooling channels are located on both sides of the second radial oil cooling channel. The inner end of the sub-oil cooling channel is connected to the second radial oil cooling channel, and the outer end of the sub-oil cooling channel extends to the end of the rotor core.

[0014] According to some embodiments of the present invention, there are multiple second axial oil cooling channels and multiple second radial oil cooling channels. The multiple second axial oil cooling channels and multiple second radial oil cooling channels are arranged sequentially along the circumference of the rotating shaft, and each second radial oil cooling channel is connected to at least one second axial oil cooling channel.

[0015] The motor according to an embodiment of the present invention includes the rotor assembly of the motor described in the above embodiment.

[0016] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0018] Figure 1 This is an axial sectional view of the rotor assembly according to an embodiment of the present invention;

[0019] Figure 2 This is a schematic diagram of the structure of the first embodiment of the rotating shaft of this utility model;

[0020] Figure 3 This is a schematic diagram of the structure of the second embodiment of the rotating shaft of this utility model;

[0021] Figure 4 This is a schematic diagram of the first embodiment of the second rotor lamination section of this utility model;

[0022] Figure 5 This is a radial sectional view of a first embodiment of the rotor assembly of this utility model;

[0023] Figure 6 This is a schematic diagram of a second embodiment of the second rotor lamination section of this utility model;

[0024] Figure 7 This is a radial sectional view of a second embodiment of the rotor assembly of this utility model;

[0025] Figure 8 This is a schematic diagram of the first embodiment of the first rotor lamination section of this utility model;

[0026] Figure 9 This is a schematic diagram of a second embodiment of the first rotor lamination section of this utility model;

[0027] Figure 10 This is a schematic diagram of a third embodiment of the first rotor lamination section of this utility model.

[0028] Figure label:

[0029] Rotor assembly 100;

[0030] Rotating shaft 10; First axial oil cooling channel 11; First radial oil cooling channel 12; First annular groove 30a;

[0031] Rotor core 20;

[0032] Second axial oil cooling channel 21; Sub-oil cooling channel 211;

[0033] Second radial oil cooling channel 22; strip-shaped oil cooling channel 221; arc-shaped oil cooling channel 222;

[0034] Second annular groove 30b;

[0035] Connecting channel 30;

[0036] Rotor lamination 40; first rotor lamination section 41; second rotor lamination section 42; third rotor lamination section 43. Detailed Implementation

[0037] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0038] The following is for reference. Figures 1-10 The present invention describes a rotor assembly 100 of an electric motor and an electric motor according to an embodiment of the present invention.

[0039] According to an embodiment of the present invention, a rotor assembly 100 of a motor includes a rotating shaft 10 and a rotor core 20. The rotor core 20 is sleeved on the outer peripheral wall of the rotating shaft 10. The rotating shaft 10 forms a first axial oil cooling channel 11 and a first radial oil cooling channel 12 that are connected. The rotor core 20 forms a second axial oil cooling channel 21 and a second radial oil cooling channel 22 that are connected. A connecting channel 30 is formed between the outer wall surface of the rotating shaft 10 and the inner peripheral wall of the rotor core 20. The connecting channel 30 is annular and is arranged around the rotating shaft 10 along the circumference of the rotating shaft 10. Along the radial direction of the rotating shaft 10, the first radial oil cooling channel 12 and the second radial oil cooling channel 22 are both arranged opposite to the connecting channel 30 so that the connecting channel 30 connects the first radial oil cooling channel 12 and the second radial oil cooling channel 22.

[0040] The rotor core 20 is sleeved on the outer peripheral wall of the rotating shaft 10. The rotor core 20 and the rotating shaft 10 can be assembled with an interference fit or a key connection to ensure efficient torque transmission from the rotating shaft 10 to the rotor core 20. The rotor core 20 and the rotating shaft 10 can be fixedly connected by welding, riveting, or other methods.

[0041] The rotating shaft 10 has a first axial oil cooling channel 11 and a first radial oil cooling channel 12 that are connected. The first axial oil cooling channel 11 extends along the center line of the rotating shaft 10, and the first radial oil cooling channel 12 extends radially along the rotating shaft 10. The first radial oil cooling channel 12 is evenly distributed along the circumference of the rotating shaft 10, and the first axial oil cooling channel 11 and the first radial oil cooling channel 12 are connected. Cooling oil can enter the first axial oil cooling channel 11 from the oil inlet and then be diverted to the first radial oil cooling channel 12, thereby achieving the effect of uniform cooling of the rotating shaft 10. This allows the cooling oil to directly act on the key parts of the rotating shaft 10, achieving precise cooling without the need for a complex cooling system or additional cooling equipment.

[0042] The rotor core 20 has a connected second axial oil cooling channel 21 and a second radial oil cooling channel 22. Specifically, the second axial oil cooling channel 21 extends along the axial direction of the rotor core 20 and is evenly distributed along the circumference of the rotor core 20. The second radial oil cooling channel 22 extends along the radial direction of the rotor core 20 and is also evenly distributed along the circumference of the rotor core 20. The second axial oil cooling channel 21 and the second radial oil cooling channel 22 are connected, allowing the cooling oil to flow along the radial and axial directions of the rotor core 20. This effectively removes the heat generated in the axial direction by the rotor core 20, ensuring that the cooling oil is evenly distributed in different parts of the rotor core 20. This avoids local overheating and improves the uniformity of heat dissipation. The uniform temperature distribution and effective heat dissipation help extend the service life of the internal components of the motor and reduce maintenance costs.

[0043] A connecting channel 30 is formed between the outer wall of the rotating shaft 10 and the inner peripheral wall of the rotor core 20. The connecting channel 30 is annular and is arranged around the rotating shaft 10 in the circumferential direction so that the rotating shaft 10 and the rotor core 20 are connected in the circumferential direction. In the radial direction of the rotating shaft 10, the first radial oil cooling channel 12 and the second radial oil cooling channel 22 are arranged opposite to the connecting channel 30 so that the connecting channel 30 connects the first radial oil cooling channel 12 and the second radial oil cooling channel 22, thereby enabling the cooling oil to flow from the first radial oil cooling channel 12 to the second radial oil cooling channel 22, and realizing the cooling effect of the cooling oil flowing in the rotating shaft 10 and the rotor core 20.

[0044] It can be explained that the fact that the first radial oil cooling channel 12 and the second radial oil cooling channel 22 are both arranged opposite to the connecting channel 30 means that along the axial direction of the rotating shaft 10, the first radial oil cooling channel 12 and the second radial oil cooling channel 22 are both corresponding to the connecting channel 30, so that the connecting channel 30 is connected to both the first radial oil cooling channel 12 and the second radial oil cooling channel 22, thereby enabling the connecting channel 30 to connect the first radial oil cooling channel 12 and the second radial oil cooling channel 22.

[0045] Furthermore, it eliminates the need for a one-to-one correspondence and connection between the first radial oil cooling channel 12 and the second radial oil cooling channel 22. This means that during the installation of the rotor core 20 and the shaft 10, it is not necessary to align and position the first radial oil cooling channel 12 and the second radial oil cooling channel 22 one-to-one in the circumferential direction. When assembling the rotor core 20 and the shaft 10, it is only necessary to ensure that the first radial oil cooling channel 12 and the second radial oil cooling channel 22 correspond to the axial position of the connecting channel 30. The first radial oil cooling channel 12 and the second radial oil cooling channel 22 can then be connected through the connecting channel 30, ensuring that the first radial oil cooling channel 12 and the second radial oil cooling channel 22 are always connected. This eliminates the need for circumferential positioning of the first radial oil cooling channel 12 and the second radial oil cooling channel 22 during the assembly of the rotor core 20 and the shaft 10, reducing the assembly difficulty of the rotor assembly 100. The first radial oil cooling channel 12 and the second radial oil cooling channel 22 do not need to be deliberately aligned, which also reduces the machining accuracy, making the machining of the rotor assembly 100 simpler and more flexible, thereby reducing machining costs and time.

[0046] The number of the first radial oil cooling channel 12 and the second radial oil cooling channel 22 do not need to be the same. As long as the cooling oil can flow from the first radial oil cooling channel 12 to the connecting channel 30, the cooling oil can flow from the inside of the rotating shaft 10 to the inside of the rotor core 20. The number of the first radial oil cooling channel 12 can be set according to the actual situation. As long as there is at least one first radial oil cooling channel 12, the cooling oil can flow from the inside of the rotating shaft 10 to the inside of the rotor core 20. Therefore, it can effectively reduce the number of the first radial oil cooling channels 12, simplify the structural composition of the rotor assembly 100, and thus reduce the manufacturing difficulty of the rotor assembly 100.

[0047] According to an embodiment of the present invention, the rotor assembly 100 of the motor has a connecting channel 30 formed between the rotating shaft 10 and the rotor core 20. The connecting channel 30 is annular and arranged around the rotating shaft 10 in the circumferential direction. In the radial direction of the rotating shaft 10, the first radial oil cooling channel 12 and the second radial oil cooling channel 22 are both arranged opposite to the connecting channel 30, so that the connecting channel 30 connects the first radial oil cooling channel 12 and the second radial oil cooling channel 22. This eliminates the need to align and position the first radial oil cooling channel 12 and the second radial oil cooling channel 22 one by one in the circumferential direction when assembling the rotor core 20 and the rotating shaft 10, and the number of the first radial oil cooling channel 12 and the second radial oil cooling channel 22 does not need to be consistent. The structure is simple and greatly reduces the manufacturing and assembly difficulty of the rotor assembly 100.

[0048] According to some embodiments of the present invention, such as Figure 2As shown, the outer peripheral wall of the rotating shaft 10 can be formed with a first annular groove 30a, and the rotating shaft 10 and the rotor core 20 form a communication channel 30 through the first annular groove 30a.

[0049] Among them, such as Figure 2 As shown, in the first embodiment of the rotating shaft 10 of this utility model, the first annular groove can be located at the middle of the rotating shaft 10, which facilitates the uniform dispersion of cooling oil. The first annular groove 30a is arranged around the rotating shaft 10 along its circumference and communicates with the first radial oil cooling channel 12. The first annular groove 30a forms a communicating channel 30, which can collect cooling oil from the first radial oil cooling channel 12 into the communicating channel 30. The cooling oil then flows from the communicating channel 30 to the second radial oil cooling channel 22. Therefore, it is not necessary to arrange the first radial oil cooling channel 12 and the second radial oil cooling channel 22 in a one-to-one correspondence; it is only necessary to ensure that the first radial oil cooling channel 12 and the second radial oil cooling channel 22 are properly aligned. All of these correspond to the axial positions of the connecting channel 30, which connects the first radial oil cooling channel 12 and the second radial oil cooling channel 22. This ensures that the first radial oil cooling channel 12 and the second radial oil cooling channel 22 are always connected, eliminating the need for circumferential positioning of the first radial oil cooling channel 12 and the second radial oil cooling channel 22 during the assembly of the rotor core 20 and the shaft 10. This further reduces the assembly difficulty of the rotor assembly 100. The first radial oil cooling channel 12 and the second radial oil cooling channel 22 do not need to be deliberately aligned, which also reduces the machining accuracy. This makes the machining of the rotor assembly 100 simpler and more flexible, thereby further reducing machining costs and time.

[0050] Furthermore, the outer peripheral wall of the rotating shaft 10 can be formed with a first annular groove 30a, which forms a connecting channel 30. This allows the cooling oil to further cool the rotating shaft 10 and the rotor core 20 on the outer peripheral wall of the rotating shaft 10 and the inner peripheral wall of the rotor core 20, thereby improving the cooling effect of the rotor assembly 100, effectively enhancing the safety and reliability of the rotor assembly 100, and also helping to extend the service life of the rotor assembly 100.

[0051] According to some embodiments of the present invention, such as Figure 5As shown, in the first embodiment of the rotor assembly 100 of this utility model, the end of the first radial oil cooling channel 12 away from the first axial oil cooling channel 11 extends to the bottom wall of the first annular groove 30a, so that the first annular groove 30a communicates with the first radial oil cooling channel 12, and the first annular groove 30a is arranged around the outer peripheral wall of the rotating shaft 10, so that the first annular groove 30a always corresponds to and communicates with the second radial oil cooling channel 22, thereby enabling the first radial oil cooling channel 12 and the second radial oil cooling channel 22 to be connected through the first annular groove 30a. During assembly, as long as the rotor core 20 and the shaft 10 are aligned axially, the first radial oil cooling channel 12 and the second radial oil cooling channel 22 can be connected through the first annular groove 30a. There is no need to design the relative position of the first radial oil cooling channel 12 and the second radial oil cooling channel 22 during processing, nor is there a need to adjust and position the first radial oil cooling channel 12 and the second radial oil cooling channel 22 circumferentially during assembly. It can also reduce the number of the first radial oil cooling channel 12 and the second radial oil cooling channel 22, simplify the design layout of the oil cooling channel, reduce the complexity of the oil cooling channel, and thus reduce the processing cost.

[0052] According to some embodiments of the present invention, such as Figure 6 and Figure 7 As shown, a second annular groove 30b can be formed on the inner peripheral wall of the rotor core 20 facing the rotating shaft 10, and the rotating shaft 10 and the rotor core 20 form a communication channel 30 through the second annular groove 30b.

[0053] Among them, such as Figure 6 The image shown is a second embodiment of the second rotor lamination section 42 of this utility model. Figure 7The image shows a second embodiment of the rotor assembly 100 of this utility model. A second annular groove 30b can be formed on the inner peripheral wall of the rotor core 20 facing the rotating shaft 10. Specifically, the inner diameter of the inner peripheral wall of the rotor core 20 facing the rotating shaft 10 can be larger than the outer diameter of the rotating shaft 10. When the rotor core 20 is fitted onto the outer peripheral wall of the rotating shaft 10, a gap is formed between the rotor core 20 and the rotating shaft 10 to form the second annular groove 30b. The second radial oil cooling channel 22 is correspondingly connected to the second annular groove 30b. The second annular groove 30b is arranged around the rotating shaft 10 along its circumference, and it is correspondingly connected to the second radial oil cooling channel 22, thus forming a communication between the second annular groove 30b and the second radial oil cooling channel 22. The connecting channel 30 allows cooling oil to be collected from the first radial oil cooling channel 12 into the connecting channel 30, and then the cooling oil flows from the connecting channel 30 to the second radial oil cooling channel 22. It is not necessary to set the first radial oil cooling channel 12 and the second radial oil cooling channel 22 in a one-to-one correspondence. It is only necessary to ensure that the first radial oil cooling channel 12 and the second radial oil cooling channel 22 are axially aligned with the connecting channel 30. The first radial oil cooling channel 12 and the second radial oil cooling channel 22 can be connected through the connecting channel 30, so that the first radial oil cooling channel 12 and the second radial oil cooling channel 22 are always connected. This eliminates the step of circumferentially positioning the first radial oil cooling channel 12 and the second radial oil cooling channel 22 when assembling the rotor core 20 and the shaft 10, and further reduces the assembly difficulty of the rotor assembly 100.

[0054] Due to the presence of the second annular groove 30b, both the first radial oil cooling channel 12 and the second radial oil cooling channel 22 are connected to the second annular groove 30b. When assembling the rotor core 20 and the shaft 10, it is not necessary to precisely align the first radial oil cooling channel 12 and the second radial oil cooling channel 22 for assembly. This reduces the precision requirements of the rotor assembly 100 during processing, making the processing of the rotor assembly 100 simpler and more flexible, thereby further reducing processing costs and time.

[0055] According to some embodiments of the present invention, such as Figure 6 and Figure 7As shown, the end of the second radial oil cooling channel 22 away from the second axial oil cooling channel 21 extends to the bottom wall of the second annular groove 30b, so that the second annular groove 30b communicates with the second radial oil cooling channel 22. The second annular groove 30b is arranged around the rotating shaft 10 in the circumferential direction, so that the second annular groove 30b always corresponds to and communicates with the first radial oil cooling channel 12, thereby enabling the first radial oil cooling channel 12 and the second radial oil cooling channel 22 to be connected through the second annular groove 30b. During assembly, as long as the rotor core 20 and the shaft 10 are aligned axially, the first radial oil cooling channel 12 and the second radial oil cooling channel 22 can be connected through the first annular groove 30a. There is no need to design the relative position of the first radial oil cooling channel 12 and the second radial oil cooling channel 22 during processing, nor is there a need to adjust and position the first radial oil cooling channel 12 and the second radial oil cooling channel 22 circumferentially during assembly. It can also reduce the number of the first radial oil cooling channel 12 and the second radial oil cooling channel 22, simplify the design layout of the oil cooling channel, reduce the complexity of the oil cooling channel, and thus reduce the processing cost.

[0056] According to some embodiments of the present invention, such as Figure 1 , Figure 4 , Figures 8-10 As shown, the rotor core 20 may include a plurality of rotor laminations 40, which are arranged sequentially along the axial direction of the shaft 10 to form the rotor core 20. The plurality of rotor laminations 40 form a first rotor lamination portion 41, a second rotor lamination portion 42, and a third rotor lamination portion 43. The second rotor lamination portion 42 is located between the first rotor lamination portion 41 and the third rotor lamination portion 43. The inner diameter of the second rotor lamination portion 42 is larger than the inner diameters of the first rotor lamination portion 41 and the third rotor lamination portion 43, so that the first rotor lamination portion 41, the second rotor lamination portion 42, and the third rotor lamination portion 43 together define a second annular groove 30b.

[0057] The rotor core 20 may include a plurality of rotor laminations 40. In some embodiments of the present invention, the rotor core 20 may include two, three, four or other numbers of rotor laminations 40. However, the present invention is not limited to this. The rotor core 20 may also include other numbers of rotor laminations 40, as long as the rotor core 20 includes a plurality of rotor laminations 40.

[0058] Multiple rotor laminations 40 are arranged and stacked sequentially along the axial direction of the shaft 10 to form a rotor core 20, which can improve the mechanical strength and deformation resistance of the rotor core 20. Furthermore, the stacked structure of the rotor core 20 formed by multiple rotor laminations 40 helps to disperse the stress generated by the rotor assembly 100 during high-speed rotation, reducing damage caused by stress concentration.

[0059] Multiple rotor laminations 40 can form a first rotor lamination section 41, a second rotor lamination section 42, and a third rotor lamination section 43. The materials and structures of the first rotor lamination section 41, the second rotor lamination section 42, and the third rotor lamination section 43 can be reasonably set according to actual conditions (the materials and structures of the first rotor lamination section 41, the second rotor lamination section 42, and the third rotor lamination section 43 can be different or the same), which can optimize the electromagnetic performance of the rotor core 20, such as increasing the permeability and reducing eddy current losses.

[0060] The second rotor lamination 42 is located between the first rotor lamination 41 and the third rotor lamination 43. The inner diameter of the second rotor lamination 42 can be larger than the inner diameters of the first rotor lamination 41 and the third rotor lamination 43, and the inner diameters of the first rotor lamination 41 and the third rotor lamination 43 can be the same. When the rotor core 20 is sleeved on the outer peripheral wall of the rotating shaft 10, the inner walls of the first rotor lamination 41 and the third rotor lamination 43 can abut against the outer peripheral wall of the rotating shaft 10, and the inner wall of the second rotor lamination 42 is spaced apart from the outer peripheral wall of the rotating shaft 10, so that the first rotor lamination 41, the second rotor lamination 42 and the third rotor lamination 43 together define the second annular groove 30b. The second radial oil cooling channel 22 can be formed in the second rotor lamination portion 42, and the second radial oil cooling channel 22 is connected to the second annular groove 30b. The second annular groove 30b is arranged around the outer peripheral wall of the rotating shaft 10. The second annular groove 30b is connected to the first radial oil cooling channel 12, and thus the first radial oil cooling channel 12 and the second radial oil cooling channel 22 can be connected through the second annular groove 30b.

[0061] When assembling the rotor assembly 100, as long as the rotor core 20 and the shaft 10 are aligned axially, the first radial oil cooling channel 12 and the second radial oil cooling channel 22 can be connected through the second annular groove 30b. There is no need to design the relative position of the first radial oil cooling channel 12 and the second radial oil cooling channel 22 during processing, nor is there a need to adjust and position the first radial oil cooling channel 12 and the second radial oil cooling channel 22 circumferentially during assembly. It can also reduce the number of the first radial oil cooling channel 12 and the second radial oil cooling channel 22, simplify the design layout of the oil cooling channel, reduce the complexity of the oil cooling channel, and thus reduce processing costs.

[0062] According to some embodiments of the present invention, such as Figures 1-3 As shown, there can be multiple first radial oil cooling channels 12, and the multiple first radial oil cooling channels 12 are arranged sequentially along the circumference of the rotating shaft 10. The connecting channel 30 is connected to the multiple first radial oil cooling channels 12.

[0063] The first radial oil cooling channel 12 can be multiple. In some embodiments of this invention, there can be two, three, four, or other numbers of first radial oil cooling channels 12. However, this invention is not limited to these numbers, and other numbers of first radial oil cooling channels 12 are also possible, as long as there are multiple first radial oil cooling channels 12. The multiple first radial oil cooling channels 12 are arranged sequentially along the circumference of the rotating shaft 10. The connecting channel 30 is connected to all the multiple first radial oil cooling channels 12, enabling the cooling oil in the first axial oil cooling channel 11 to flow quickly and evenly from the multiple first radial oil cooling channels 12 into the connecting channel 30. This increases the heat exchange area between the cooling oil and the rotating shaft 10, improving the cooling effect of the rotating shaft 10. The cooling oil can carry away the heat generated by the rotating shaft 10 during operation, reducing its temperature and ensuring stable operation of the motor. Furthermore, the connecting channel 30 and the multiple first radial oil cooling channels 12 can also guide the cooling oil to form a reasonable flow path inside the rotor core 20, helping to reduce the flow resistance of the cooling oil and improve cooling efficiency.

[0064] According to some embodiments of the present invention, such as Figure 1 As shown, the second axial oil cooling channel 21 may include two sub-oil cooling channels 211. Along the axial direction of the rotating shaft 10, the two sub-oil cooling channels 211 are located on both sides of the second radial oil cooling channel 22. The inner end of the sub-oil cooling channel 211 is connected to the second radial oil cooling channel 22, and the outer end of the sub-oil cooling channel 211 extends to the end of the rotor core 20.

[0065] Among them, such as Figure 1 As shown, along the axial direction of the rotating shaft 10, two sub-oil cooling channels 211 are located on both sides of the second radial oil cooling channel 22. The inner end of the sub-oil cooling channel 211 is connected to the second radial oil cooling channel 22, and the outer end of the sub-oil cooling channel 211 extends to the end of the rotor core 20. This allows cooling oil to be guided from the second radial oil cooling channel 22 to the sub-oil cooling channel 211 and the end of the rotor core 20, thereby cooling the end of the rotor core 20 and the squirrel cage structure outside the rotor core. This improves the temperature distribution inside the motor, reduces the risk of local overheating, and thus improves the reliability and lifespan of the motor. It also reduces temperature fluctuations and thermal stress concentration during motor operation, thereby reducing the occurrence of failures.

[0066] According to some embodiments of the present invention, such as Figure 5 and Figure 7 As shown, there can be multiple second axial oil cooling channels 21 and multiple second radial oil cooling channels 22. The multiple second axial oil cooling channels 21 and multiple second radial oil cooling channels 22 are arranged sequentially along the circumference of the rotating shaft 10. Each second radial oil cooling channel 22 is connected to at least one second axial oil cooling channel 21.

[0067] In this invention, there can be multiple second axial oil cooling channels 21 and multiple second radial oil cooling channels 22. In some embodiments of this invention, there can be two, three, four, or other numbers of second axial oil cooling channels 21 and second radial oil cooling channels 22. However, this invention is not limited to this and other numbers of second axial oil cooling channels 21 and second radial oil cooling channels 22 are also possible, as long as there are multiple second axial oil cooling channels 21 and multiple second radial oil cooling channels 22. This arrangement can increase the heat exchange area between the rotor core 20 and the cooling oil, thereby improving the cooling effect of the rotor core 20, ensuring that the rotor core 20 can operate normally at a suitable temperature, and thus improving the working safety and reliability of the motor.

[0068] Multiple second axial oil cooling channels 21 and multiple second radial oil cooling channels 22 are arranged sequentially along the circumference of the rotating shaft 10. Each second radial oil cooling channel 22 is connected to at least one second axial oil cooling channel 21. In some embodiments of this invention, each second radial oil cooling channel 22 may be connected to one, two, three, four, or other numbers of second axial oil cooling channels 21. However, this invention is not limited to this; each second radial oil cooling channel 22 may also be connected to other numbers of second axial oil cooling channels 21, as long as each second radial oil cooling channel 22 is connected to at least one second axial oil cooling channel 21. This arrangement ensures that each second radial oil cooling channel 22 is connected to a second axial oil cooling channel 21, allowing the cooling oil to be evenly distributed inside the rotor core 20. This more effectively removes the heat generated by the rotor core 20 during operation, thereby improving the cooling effect of the rotor core 20.

[0069] Furthermore, each second radial oil cooling channel 22 may include: a strip-shaped oil cooling channel 221 and an arc-shaped oil cooling channel 222. One end of the strip-shaped oil cooling channel 221 is connected to the arc-shaped oil cooling channel 222, and the other end of the strip-shaped oil cooling channel 221 is connected to the connecting channel 30. The arc-shaped oil cooling channel 222 extends circumferentially along the rotating shaft 10. The second radial oil cooling channels 22 are arranged sequentially along the circumferential direction of the rotating shaft 10. Along the axial direction of the rotating shaft 10, the arrangement position of the arc-shaped oil cooling channels 222 is the same as the arrangement position of the second axial oil cooling channels 21. The overlap between the second radial oil cooling channel 22 and the second axial oil cooling channel 21 increases the overlapping area. This not only allows each second radial oil cooling channel 22 to connect with more second axial oil cooling channels 21, but also increases the area of ​​the second radial oil cooling channels 22. This collectively increases the heat exchange area between the cooling oil and the rotor core 20, which can more effectively remove the heat generated by the rotor core 20 during operation, ensuring that the rotor core 20 is adequately cooled, avoiding local overheating, and thus improving heat dissipation efficiency.

[0070] Furthermore, the cross-sectional shape of the second axial oil cooling channel 21 can be reasonably set according to actual conditions. In some embodiments of this utility model, the cross-sectional shape of the second axial oil cooling channel 21 can be circular, triangular, or strip-shaped, such as... Figure 8 In a first embodiment of the first rotor lamination 41 of this utility model, the cross-sectional shape of the second axial oil cooling channel 21 can be circular. Figure 9 In a second embodiment of the first rotor lamination 41 of this utility model, the cross-sectional shape of the second axial oil cooling channel 21 can be triangular. Figure 10 In the third embodiment of the first rotor lamination 41 of this utility model, the cross-sectional shape of the second axial oil cooling channel 21 can be strip-shaped.

[0071] Furthermore, it can be explained that, as Figure 2 The first embodiment of the rotating shaft 10 shown in the present utility model embodiment and the following are examples of the present utility model. Figure 4 The first embodiment of the second rotor lamination 42 shown in the present invention can define the following: Figure 5 The first embodiment of the rotor assembly 100 of this utility model is shown. The structures of the first rotor lamination 41 and the third rotor lamination 43 can be identical, as shown below. Figures 8-10 The first, second, and third embodiments of the first rotor lamination 41 are shown. The first, second, and third embodiments of the first rotor lamination 41 and the third rotor lamination 43 can all be used in the first embodiment of the rotor assembly 100 of this utility model.

[0072] like Figure 3 The second embodiment of the rotating shaft 10 shown in the present utility model embodiment and as shown in the figure Figure 6 The second embodiment of the second rotor lamination portion 42 shown in the present invention can define the following: Figure 7 The second embodiment of the rotor assembly 100 shown in this utility model embodiment, wherein the structures of the first rotor lamination 41 and the third rotor lamination 43 can be the same, such as... Figures 8-10 The first, second, and third embodiments of the first rotor lamination 41 are shown. The first, second, and third embodiments of the first rotor lamination 41 and the third rotor lamination 43 can all be used in the second embodiment of the rotor assembly 100 of this utility model.

[0073] According to the present invention, the motor includes the rotor assembly 100 of the motor in the above embodiment. A connecting channel 30 is formed between the rotating shaft 10 and the rotor core 20. The connecting channel 30 is annular and arranged around the rotating shaft 10 in the circumferential direction. In the radial direction of the rotating shaft 10, the first radial oil cooling channel 12 and the second radial oil cooling channel 22 are both arranged opposite to the connecting channel 30, so that the connecting channel 30 connects the first radial oil cooling channel 12 and the second radial oil cooling channel 22. This eliminates the need for circumferential positioning of the first radial oil cooling channel 12 and the second radial oil cooling channel 22 when assembling the rotor core 20 and the rotating shaft 10, and the number of the first radial oil cooling channel 12 and the second radial oil cooling channel 22 does not need to be consistent. The structure is simple and greatly reduces the manufacturing and assembly difficulty of the rotor assembly 100.

[0074] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0075] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A rotor assembly (100) for an electric motor, characterized in that, The rotor assembly (100) includes: A rotating shaft (10) and a rotor core (20) are provided. The rotor core (20) is sleeved on the outer peripheral wall of the rotating shaft (10). The rotating shaft (10) forms a first axial oil cooling channel (11) and a first radial oil cooling channel (12) that are connected. The rotor core (20) forms a second axial oil cooling channel (21) and a second radial oil cooling channel (22) that are connected. A connecting channel (30) is formed between the outer wall surface of the rotating shaft (10) and the inner peripheral wall of the rotor core (20). The connecting channel (30) is annular and is arranged around the rotating shaft (10) along the circumference. Along the radial direction of the rotating shaft (10), the first radial oil cooling channel (12) and the second radial oil cooling channel (22) are both arranged opposite to the connecting channel (30) so that the connecting channel (30) connects the first radial oil cooling channel (12) and the second radial oil cooling channel (22).

2. The rotor assembly (100) of the motor according to claim 1, characterized in that, The outer peripheral wall of the rotating shaft (10) is formed with a first annular groove (30a), and the rotating shaft (10) and the rotor core (20) form the communication channel (30) through the first annular groove (30a).

3. The rotor assembly (100) of the motor according to claim 2, characterized in that, The first radial oil cooling channel (12) extends from the end opposite to the first axial oil cooling channel (11) to the bottom wall of the first annular groove (30a) so that the first annular groove (30a) communicates with the first radial oil cooling channel (12).

4. The rotor assembly (100) of the motor according to claim 1, characterized in that, The rotor core (20) has a second annular groove (30b) formed on the inner peripheral wall facing the rotating shaft (10). The second annular groove (30b) is arranged around the rotating shaft (10) along the circumference and communicates with the second radial oil cooling channel (22). The rotating shaft (10) and the rotor core (20) form the communication channel (30) through the second annular groove (30b).

5. The rotor assembly (100) of the motor according to claim 4, characterized in that, The second radial oil cooling channel (22) extends from the end opposite to the second axial oil cooling channel (21) to the bottom wall of the second annular groove (30b) so that the second annular groove (30b) communicates with the second radial oil cooling channel (22).

6. The rotor assembly (100) of the motor according to claim 4, characterized in that, The rotor core (20) includes a plurality of rotor laminations (40), which are arranged sequentially along the axial direction of the shaft (10) to form the rotor core (20). The plurality of rotor laminations (40) form a first rotor lamination portion (41), a second rotor lamination portion (42), and a third rotor lamination portion (43). The second rotor lamination portion (42) is located between the first rotor lamination portion (41) and the third rotor lamination portion (43). The inner diameter of the second rotor lamination portion (42) is larger than the inner diameter of the first rotor lamination portion (41) and the inner diameter of the third rotor lamination portion (43), so that the first rotor lamination portion (41), the second rotor lamination portion (42), and the third rotor lamination portion (43) together define the second annular groove (30b).

7. The rotor assembly (100) of the motor according to any one of claims 1-6, characterized in that, There are multiple first radial oil cooling channels (12), and the multiple first radial oil cooling channels (12) are arranged sequentially along the circumference of the rotating shaft (10). The connecting channel (30) is connected to the multiple first radial oil cooling channels (12).

8. The rotor assembly (100) of the motor according to any one of claims 1-6, characterized in that, The second axial oil cooling channel (21) includes two sub-oil cooling channels (211) along the axial direction of the rotating shaft (10). The two sub-oil cooling channels (211) are located on both sides of the second radial oil cooling channel (22). The inner end of the sub-oil cooling channel (211) is connected to the second radial oil cooling channel (22), and the outer end of the sub-oil cooling channel (211) extends to the end of the rotor core (20).

9. The rotor assembly (100) of the motor according to any one of claims 1-6, characterized in that, There are multiple second axial oil cooling channels (21) and multiple second radial oil cooling channels (22). The multiple second axial oil cooling channels (21) and multiple second radial oil cooling channels (22) are arranged sequentially along the circumference of the rotating shaft (10). Each second radial oil cooling channel (22) is connected to at least one second axial oil cooling channel (21).

10. An electric motor, characterized in that, Includes the rotor assembly (100) of the motor according to any one of claims 1-9.

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