Rotor assembly for an electric machine, electric machine and vehicle
By setting multiple cooling channels on the motor rotor, direct cooling of the magnets is achieved, solving the problem of thermal demagnetization caused by excessive magnet temperature, and improving the motor's operational reliability and rated power.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- BEIJING ELECTRIC VEHICLE
- Filing Date
- 2025-05-13
- Publication Date
- 2026-07-17
AI Technical Summary
In existing technologies, excessively high temperatures of the motor rotor's magnets can easily lead to thermal demagnetization, causing thermal failure of the motor and making direct cooling ineffective.
A rotor assembly is designed, which forms cooling channels by setting multiple laminations on the rotor, so that the cooling medium can directly cool the magnets. The assembly includes a first cooling channel, a second cooling channel, a third cooling channel, and a fourth cooling channel. The interconnected structure ensures that the cooling medium can effectively flow into the magnet slot, thereby achieving direct cooling of the magnets.
The rated power of the motor has been increased, the risk of thermal demagnetization due to excessive magnet temperature has been reduced, the reliability and stability of the motor have been improved, and the service life of the magnets has been extended.
Smart Images
Figure CN224520797U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of motor technology, and in particular to a rotor assembly for a motor, a motor having the rotor assembly, and a vehicle having the motor. Background Technology
[0002] In related technologies, the rotor is cooled by making holes in it so that the cooling medium can flow through the holes. However, this method cannot directly cool the heat source of the motor rotor—the magnets. If the magnets are too hot, they are prone to thermal demagnetization, which can lead to thermal failure of the motor. 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, in which the cooling medium can directly cool the magnets assembled in the magnet slots, reducing the risk of thermal demagnetization due to excessive magnet temperature and improving the operational reliability of the motor.
[0004] This utility model further proposes an electric motor.
[0005] This utility model further proposes a vehicle.
[0006] The rotor assembly according to an embodiment of the present invention includes: a rotating shaft having a first cooling channel; a plurality of first laminations, each first lamination being sleeved on the rotating shaft and arranged along the axial direction of the rotating shaft, each first lamination having a magnet groove extending through the first lamination along the axial direction of the rotating shaft, the magnet groove being used to install a magnet, and the magnet grooves of any two adjacent first laminations being connected; and a second lamination being sleeved on the rotating shaft, with a second lamination provided between at least two adjacent first laminations, the second lamination having a second cooling channel connecting the first cooling channel and the magnet groove of the adjacent first lamination.
[0007] According to the rotor assembly of this utility model embodiment, by providing a second cooling channel, and the second cooling channel connecting the first cooling channel and the magnet slot of the adjacent first lamination, the cooling medium in the first cooling channel can flow into the magnet slot through the second cooling channel. This is beneficial for the cooling medium to directly cool the magnet assembled in the magnet slot, thereby increasing the rated power of the motor, and also reducing the risk of thermal demagnetization due to excessive magnet temperature, thereby reducing the risk of motor thermal failure and improving the working reliability of the motor.
[0008] In some embodiments of this utility model, a third cooling channel is formed in the magnet groove of each first stack, extending through the first stack along the axis of rotation. The third cooling channels of two adjacent first stacks are opposite to and connected along the axis of rotation. The second cooling channel connects the first cooling channel and the adjacent third cooling channel.
[0009] In some embodiments of the present invention, the rotor assembly further includes: a rotor housing, which is sleeved on the second lamination and a plurality of first laminations. The rotor housing and each first lamination together define at least one fourth cooling channel that extends through the first lamination along the axial direction of the rotating shaft. The fourth cooling channels of two adjacent first laminations are opposite to and connected along the axial direction of the rotating shaft. The second cooling channel connects the first cooling channel and the adjacent fourth cooling channel.
[0010] In some embodiments of this utility model, the second cooling channel includes: a connecting channel, a first sub-cooling channel and a second sub-cooling channel. The first sub-cooling channel and the second sub-cooling channel are both connected to the first cooling channel through the connecting channel. The first sub-cooling channel is connected to the third cooling channel and the connecting channel, and the second sub-cooling channel is connected to the fourth cooling channel and the connecting channel.
[0011] In some embodiments of this utility model, along the radial direction of the second stack, the first sub-cooling channel and the second sub-cooling channel are both located radially outside the connecting channel, the connecting channel extends circumferentially along the second stack, and the first sub-cooling channel and the second sub-cooling channel are arranged circumferentially along the second stack and both extend radially along the second stack.
[0012] In some embodiments of this utility model, there are multiple first sub-cooling channels and multiple third cooling channels, all of which are arranged circumferentially along the axis of rotation and are connected in a one-to-one correspondence; and / or
[0013] There are multiple second and fourth cooling channels, and these multiple second and fourth cooling channels are arranged circumferentially along the axis of rotation and are connected one-to-one.
[0014] In some embodiments of this utility model, the rotating shaft is formed with a through hole, which connects the second cooling channel and the first cooling channel.
[0015] In some embodiments of this utility model, there are multiple through holes, and the multiple through holes and multiple second cooling channels are connected in a one-to-one correspondence.
[0016] The motor according to an embodiment of the present invention includes the rotor assembly described in the above embodiment.
[0017] The vehicle according to an embodiment of the present invention includes the motor described in the above embodiment.
[0018] 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
[0019] 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:
[0020] Figure 1 This is a schematic diagram of the rotor assembly according to an embodiment of the present utility model;
[0021] Figure 2 This is a cross-sectional view of the rotor assembly according to an embodiment of the present utility model;
[0022] Figure 3 This is a schematic diagram of the structure of the rotating shaft according to an embodiment of the present utility model;
[0023] Figure 4 This is a schematic diagram of the structure of the second stacked sheet according to an embodiment of the present utility model.
[0024] Figure label:
[0025] Rotor assembly 100;
[0026] Shaft 1; First cooling channel 11; Through hole 12;
[0027] First stack 2; Magnet slot 21; Third cooling channel 211; Fourth cooling channel 212; First assembly hole 22;
[0028] Second stack 3; Second cooling channel 31; Connecting channel 311; First sub-cooling channel 312; Second sub-cooling channel 313; Second mounting hole 32; Clearance hole 33;
[0029] Rotor housing 4;
[0030] Magnet 200. Detailed Implementation
[0031] 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.
[0032] The following is for reference. Figures 1-4 The rotor assembly 100 according to an embodiment of the present utility model is described.
[0033] like Figures 1-4As shown, the rotor assembly 100 according to an embodiment of the present invention includes: a rotating shaft 1, the rotating shaft 1 having a first cooling channel 11; a plurality of first laminations 2, the plurality of first laminations 2 being sleeved on the rotating shaft 1 and arranged along the axial direction of the rotating shaft 1, each first lamination 2 having a magnet groove 21 extending through the first lamination 2 along the axial direction of the rotating shaft 1, the magnet groove 21 being used to install magnets 200, and the magnet grooves 21 of any two adjacent first laminations 2 being connected; a second lamination 3, the second lamination 3 being sleeved on the rotating shaft 1, the second lamination 3 being provided between at least two adjacent first laminations 2, the second lamination 3 having a second cooling channel 31, the second cooling channel 31 being connected to the first cooling channel 11 and the magnet groove 21 of the adjacent first lamination 2.
[0034] The rotating shaft 1 has a first cooling channel 11, which extends through the rotating shaft 1 along its axial direction. Cooling medium can flow within the first cooling channel 11. In some embodiments of this application, the cooling medium can be cooling oil. Multiple first laminations 2 can be provided, for example, two, three, or more. Each of the multiple first laminations 2 can have a first mounting hole 22. The rotating shaft 1 passes through the first mounting holes 22 of the multiple first laminations 2 sequentially, so that the multiple first laminations 2 are all fitted onto the rotating shaft 1, and the multiple first laminations 2 are arranged along the axial direction of the rotating shaft 1.
[0035] Each first stack 2 has a magnetic groove 21 for mounting a magnet 200. The magnetic groove 21 passes through the first stack 2 along the axial direction of the rotating shaft 1. A second stack 3 is fitted onto the rotating shaft 1. The second stack 3 may have a second mounting hole 32. The rotating shaft 1 passes through the second mounting hole 32 so that the second stack 3 is fitted onto the rotating shaft 1. At least one second stack 3 is provided between any two adjacent first stacks 2. For example, there may be one, two, or more second stacks 3, and each second stack 3 has first stacks 2 at both ends along the axial direction. As some embodiments of this application, a second stack 3 is provided between any two adjacent first stacks 2. As some embodiments of this application, a second stack 3 is provided in the middle of any four adjacent first stacks 2. The second lamination 3 has a second cooling channel 31, which connects the first cooling channel 11 and the magnet groove 21 of the adjacent first lamination 2, so that the cooling medium in the first cooling channel 11 can enter the magnet groove 21 of the adjacent first lamination 2 through the second cooling channel 31.
[0036] The magnet slots 21 of any two adjacent first laminations 2 are connected so that the cooling medium can flow smoothly in the magnet slots 21 of multiple first laminations 2. This facilitates direct contact between the cooling medium and the magnets 200 assembled in the magnet slots 21, and generates convective heat transfer between them. This achieves efficient and direct cooling of the magnets 200 by the cooling medium, thereby increasing the rated power of the motor. Alternatively, it can reduce the size of the motor while keeping the rated power unchanged, thereby reducing the amount of material used per unit power of the motor. This helps to reduce the production cost of the motor and also reduces the risk of thermal demagnetization due to excessive temperature of the magnets 200, thus reducing the risk of thermal failure of the motor and improving the working reliability of the motor.
[0037] Specifically, two first laminations 2 are fitted onto the rotating shaft 1, and the two first laminations 2 are arranged along the axial direction of the rotating shaft 1. A second lamination 3 is fitted onto the rotating shaft 1, and along the axial direction of the rotating shaft 1, the second lamination 3 is positioned between the two first laminations 2. That is, along the axial direction of the rotating shaft 1, the first lamination 2, the second lamination 3, and another first lamination 2 are arranged sequentially. Each of the two first laminations 2 forms a magnet groove 21 that penetrates the first lamination 2 along the axial direction of the rotating shaft 1. Magnets 200 are installed in the magnet groove 21, and the magnet grooves 21 of the two first laminations 2 are connected. The rotating shaft 1 forms a first cooling channel 11, and the second lamination 3 forms a second cooling channel 31. The second cooling channel 31 connects the first cooling channel 11 and the magnet grooves 21 of the two adjacent first laminations 2.
[0038] Therefore, by setting a second cooling channel 31, and the second cooling channel 31 connecting the first cooling channel 11 and the magnet slot 21 of the adjacent first lamination 2, the cooling medium in the first cooling channel 11 can flow into the magnet slot 21 through the second cooling channel 31. This is beneficial for the cooling medium to directly cool the magnet 200 assembled in the magnet slot 21, thereby increasing the rated power of the motor. It can also reduce the risk of thermal demagnetization due to excessive temperature of the magnet 200, thereby reducing the risk of motor thermal failure and improving the working reliability of the motor.
[0039] In some embodiments of this utility model, such as Figure 1 and Figure 2 As shown, each first stack 2 has a third cooling channel 211 formed in the magnet groove 21, which runs through the first stack 2 along the axis of the rotating shaft 1. The third cooling channels 211 of two adjacent first stacks 2 are opposite to each other along the axis of the rotating shaft 1 and are connected. The second cooling channel 31 connects the first cooling channel 11 and the adjacent third cooling channel 211.
[0040] Each of the first laminations 2 has a third cooling channel 211 formed within its magnet groove 21. Multiple third cooling channels 211 are evenly arranged along the circumference of the first laminations 2. The third cooling channels 211 can be formed by the magnet 200 and the first laminations 2 together. The third cooling channels 211 penetrate the first laminations 2 along the axial direction of the rotating shaft 1. The third cooling channels 211 of two adjacent first laminations 2 are arranged opposite each other along the axial direction of the rotating shaft 1, and are interconnected. Furthermore, any two adjacent third cooling channels 211 are interconnected so that the cooling medium can flow within any two adjacent third cooling channels 211.
[0041] The second cooling channel 31 connects the first cooling channel 11 and the adjacent third cooling channel 211, so that the cooling medium in the first cooling channel 11 can flow into the adjacent third cooling channel 211 through the second cooling channel 31. Since any two adjacent third cooling channels 211 are opposite to each other along the axial direction of the rotating shaft 1 and are connected, it is beneficial for the cooling medium to flow smoothly in multiple third cooling channels 211, thereby achieving the effect that the cooling medium can directly cool any magnet 200 of the first stack 2.
[0042] By setting up a third cooling channel 211, the cooling medium can flow smoothly within the third cooling channel 211, reducing the risk of the cooling medium clogging the magnet slot 21 due to the gap between the magnet 200 and the first lamination 2. This achieves a reliable cooling effect on the magnet 200, reduces the risk of thermal demagnetization due to excessive temperature of the magnet 200, and thus reduces the risk of motor thermal failure.
[0043] In some embodiments of this utility model, such as Figure 1 and Figure 2 As shown, the rotor assembly 100 may further include: a rotor housing 4, which is sleeved on the second lamination 3 and a plurality of first laminations 2. The rotor housing 4 and each first lamination 2 together define at least one fourth cooling channel 212 that extends through the first lamination 2 along the axial direction of the shaft 1. The fourth cooling channels 212 of two adjacent first laminations 2 are opposite to and connected along the axial direction of the shaft 1. The second cooling channel 31 connects the first cooling channel 11 and the adjacent fourth cooling channel 212.
[0044] In some embodiments of this application, the rotor housing 4 can be constructed of carbon fiber. In some embodiments of this application, the rotor housing 4 can be constructed of metal. The rotor housing 4 is sleeved on the second lamination 3 and the plurality of first laminations 2. The rotor housing 4 can provide support for the second lamination 3 and the plurality of first laminations 2, so that the second lamination 3 and the plurality of first laminations 2 can work stably and reduce the risk of vibration or even damage to the second lamination 3 and the plurality of first laminations 2.
[0045] The rotor housing 4 and the first lamination 2 together define a fourth cooling channel 212. The fourth cooling channel 212 can be at least one, for example, one, two, or more. When there are multiple fourth cooling channels 212, they are evenly arranged circumferentially along the first lamination 2. The fourth cooling channel 212 can be formed by the rotor housing 4, the magnet 200, and the first lamination 2 together surrounding it. The fourth cooling channel 212 penetrates the first lamination 2 along the axial direction of the shaft 1. The fourth cooling channels 212 of two adjacent first laminations 2 are arranged opposite each other along the axial direction of the shaft 1, and the fourth cooling channels 212 of two adjacent first laminations 2 are interconnected, so that the cooling medium can flow within any two adjacent fourth cooling channels 212.
[0046] The second cooling channel 31 connects the first cooling channel 11 and the adjacent fourth cooling channel 212, so that the cooling medium in the first cooling channel 11 can flow into the adjacent fourth cooling channel 212 through the second cooling channel 31. Since any two adjacent fourth cooling channels 212 are opposite to each other along the axial direction of the rotating shaft 1 and are connected, it is beneficial for the cooling medium to flow smoothly in multiple fourth cooling channels 212, thereby achieving the effect that the cooling medium can directly cool any magnet 200 of the first stack 2.
[0047] By setting up the fourth cooling channel 212, the cooling medium can flow smoothly within it, further reducing the risk of the cooling medium clogging the magnet slot 21 due to gap flow between the magnet 200 and the first lamination 2. This achieves reliable cooling of the magnet 200, reducing the risk of thermal demagnetization due to excessive temperature and thus lowering the risk of motor thermal failure. The magnet 200 has one end facing the third cooling channel 211 and the other end facing the fourth cooling channel 212. The arrangement of the third and fourth cooling channels 211 and 212 also facilitates uniform heat exchange between the two ends of the magnet 200, reducing the risk of performance degradation due to large temperature differences between different parts of the magnet 200 during operation, thereby extending the service life of the magnet 200.
[0048] In some embodiments of this utility model, such as Figure 4 As shown, the second cooling channel 31 may include: a connecting channel 311, a first sub-cooling channel 312, and a second sub-cooling channel 313. The first sub-cooling channel 312 and the second sub-cooling channel 313 are both connected to the first cooling channel 11 through the connecting channel 311. The first sub-cooling channel 312 is connected to the third cooling channel 211 and the connecting channel 311, and the second sub-cooling channel 313 is connected to the fourth cooling channel 212 and the connecting channel 311.
[0049] The first sub-cooling channel 312 and the second sub-cooling channel 313 are both connected to the connecting channel 311, and the connecting channel 311 is connected to the first cooling channel 11, so that the first sub-cooling channel 312 and the second sub-cooling channel 313 are both connected to the first cooling channel 11 through the connecting channel 311. For example, the second mounting hole 32 is connected to the connecting channel 311 through the clearance hole 33, and the rotating shaft 1 is formed with a through hole 12. As some embodiments of this application, when there is one clearance hole 33, there is one connecting channel 311. The connecting channel 311 extends along the circumference of the second lamination 3, and the through hole 12 can also be set as one. When the second lamination 3 is assembled on the rotating shaft 1, the through hole 12 and the clearance hole 33 are arranged opposite to each other. As some embodiments of this application, when there are multiple clearance holes 33, there are multiple connecting channels 311. The multiple connecting channels 311 are arranged along the circumference of the second stack 3, and multiple through holes 12 are also provided. When the second stack 3 is assembled on the rotating shaft 1, the multiple through holes 12 are corresponding to and opposite to the multiple clearance holes 33, so that the cooling medium in the first cooling channel 11 can flow into the corresponding connecting channel 311 through the corresponding through holes 12 and the corresponding clearance holes 33 in sequence, thereby achieving the effect of connecting the connecting channel 311 and the first cooling channel 11.
[0050] The first sub-cooling channel 312 connects to the third cooling channel 211 and the connecting channel 311, allowing the cooling medium flowing into the first sub-cooling channel 312 through the connecting channel 311 to flow smoothly into the third cooling channel 211. The second sub-cooling channel 313 connects to the fourth cooling channel 212 and the connecting channel 311, allowing the cooling medium flowing into the second sub-cooling channel 313 through the connecting channel 311 to flow smoothly into the fourth cooling channel 212. This enables the cooling medium to flow smoothly into the magnet slot 21 and directly contact the magnet 200, generating convective heat transfer between the cooling medium and the magnet 200. This achieves efficient and direct cooling of the magnet 200 by the cooling medium, increasing the rated power of the motor, or reducing the motor size while maintaining the rated power, thereby reducing the material usage per unit power of the motor. This helps reduce the production cost of the motor and also reduces the risk of thermal demagnetization due to excessive temperature of the magnet 200, thus reducing the risk of motor thermal failure and improving the reliability of the motor.
[0051] In some embodiments of this utility model, such as Figure 4 As shown, along the radial direction of the second stack 3, the first sub-cooling channel 312 and the second sub-cooling channel 313 are both located radially outside the connecting channel 311. The connecting channel 311 extends circumferentially along the second stack 3. The first sub-cooling channel 312 and the second sub-cooling channel 313 are arranged circumferentially along the second stack 3 and both extend radially along the second stack 3.
[0052] Along the radial direction of the second stack 3, the first sub-cooling channel 312 and the second sub-cooling channel 313 are both located radially outside the connecting channel 311. This arrangement allows for a reasonable positioning of the first sub-cooling channel 312 and the second sub-cooling channel 313, which is beneficial for the first sub-cooling channel 312 to be aligned with the third cooling channel 211, and for the second sub-cooling channel 313 to be aligned with the fourth cooling channel 212. This facilitates the smooth flow of the cooling medium to the third cooling channel 211 and the fourth cooling channel 212.
[0053] The connecting channel 311 extends circumferentially along the second lamination 3 so that the cooling medium can flow circumferentially along the second lamination 3. The first sub-cooling channel 312 and the second sub-cooling channel 313 are arranged circumferentially along the second lamination 3, and both the first sub-cooling channel 312 and the second sub-cooling channel 313 extend radially along the second lamination 3. This helps to improve the uniformity of the distribution of the cooling medium in the circumferential direction of the second lamination 3. The medium flows radially to the radial outer ends of the first sub-cooling channel 312 and the second sub-cooling channel 313, respectively, and then flows into the corresponding third cooling channel 211 and fourth cooling channel 212. This helps to improve the uniformity of the distribution of the cooling medium in the multiple third cooling channels 211 and multiple fourth cooling channels 212, thereby uniformly heat-exchanging the multiple magnets 200, reducing the risk of excessive temperature difference between different magnets 200, thereby reducing the temperature gradient in different parts of the rotor assembly 100 and improving the working stability of the rotor assembly 100.
[0054] In some embodiments of this utility model, such as Figure 4 As shown, there are multiple first sub-cooling channels 312 and multiple third cooling channels 211. These multiple first sub-cooling channels 312 and multiple third cooling channels 211 are arranged circumferentially along the rotating shaft 1 and are connected in a one-to-one correspondence; and / or
[0055] There are multiple second sub-cooling channels 313 and multiple fourth cooling channels 212. The multiple second sub-cooling channels 313 and multiple fourth cooling channels 212 are arranged circumferentially along the rotating shaft 1 and are connected in a one-to-one correspondence.
[0056] In some embodiments of this application, there are multiple first sub-cooling channels 312 and multiple third cooling channels 211, all of which are arranged circumferentially along the rotating shaft 1 and are connected in a one-to-one correspondence. In some embodiments of this application, there are multiple second sub-cooling channels 313 and multiple fourth cooling channels 212, all of which are arranged circumferentially along the rotating shaft 1 and are connected in a one-to-one correspondence. In some embodiments of this application, there are multiple first sub-cooling channels 312 and multiple third cooling channels 211, all of which are arranged circumferentially along the rotating shaft 1 and are connected in a one-to-one correspondence. Furthermore, there are multiple second sub-cooling channels 313 and multiple fourth cooling channels 212, all of which are arranged circumferentially along the rotating shaft 1 and are connected in a one-to-one correspondence.
[0057] Both the first sub-cooling channel 312 and the third cooling channel 211 can be configured in multiple ways. For example, the first sub-cooling channel 312 and the third cooling channel 211 can be configured in two, three, six or more ways. The multiple first sub-cooling channels 312 and the multiple third cooling channels 211 are arranged circumferentially along the rotating shaft 1, and the multiple first sub-cooling channels 312 and the multiple third cooling channels 211 are connected in a one-to-one correspondence. That is, one first sub-cooling channel 312 and one third cooling channel 211 are connected in a one-to-one correspondence, so that the cooling medium can flow from the first cooling channel 11 into the connected channel 311 through the through hole 12 and the clearance hole 33 in sequence. The cooling medium flows along the connected channel 311 so that the cooling medium flows evenly in the circumferential direction and flows towards the radial outer end of the corresponding first sub-cooling channel 312, and flows through the first sub-cooling channel 312 to the corresponding third cooling channel 211, so as to uniformly cool the multiple magnets 200.
[0058] Both the second sub-cooling channel 313 and the fourth cooling channel 212 can be configured in multiple ways. For example, the second sub-cooling channel 313 and the fourth cooling channel 212 can be configured in two, three, six or more ways. The multiple second sub-cooling channels 313 and the multiple fourth cooling channels 212 are arranged circumferentially along the rotating shaft 1, and the multiple second sub-cooling channels 313 and the multiple fourth cooling channels 212 are connected in a one-to-one correspondence. That is, one second sub-cooling channel 313 and one fourth cooling channel 212 are connected in a one-to-one correspondence, so that the cooling medium can flow from the first cooling channel 11 into the connecting channel 311 through the through hole 12 and the clearance hole 33 in sequence. The cooling medium flows along the connecting channel 311 so that the cooling medium flows evenly in the circumferential direction, and flows towards the radial outer end of the corresponding second sub-cooling channel 313, and flows through the second sub-cooling channel 313 to the corresponding fourth cooling channel 212, so as to uniformly cool the multiple magnets 200.
[0059] In some embodiments of this utility model, such as Figure 3 As shown, the rotating shaft 1 has a through hole 12, which connects the second cooling channel 31 and the first cooling channel 11.
[0060] The rotating shaft 1 has a through hole 12, which is arranged radially through the rotating shaft 1. The through hole 12 connects the second cooling channel 31 and the first cooling channel 11. For example, the second assembly hole 32 is connected to the connecting channel 311 through the clearance hole 33. When the second lamination 3 is assembled on the rotating shaft 1, the through hole 12 and the clearance hole 33 are arranged opposite to each other so that the through hole 12 connects the second cooling channel 31 and the first cooling channel 11. Furthermore, the through hole 12 connects the connecting channel and the first cooling channel 11 so that the cooling medium can flow into the corresponding connecting channel 311 through the corresponding through hole 12 and the corresponding clearance hole 33 in sequence. This allows the cooling medium to flow smoothly into the corresponding third cooling channel 211 and fourth cooling channel 212 through the second cooling channel 31, so that the cooling medium can smoothly enter the magnet groove 21 to cool the magnet 200.
[0061] In some embodiments of this utility model, such as Figure 3 and Figure 4 As shown, there are multiple through holes 12, and the multiple through holes 12 are connected to the multiple second cooling channels 31 in a one-to-one correspondence.
[0062] The through holes 12 can be multiple, for example, two, three or more. The number of second cooling channels 31 can be adapted to the number of through holes 12. Multiple through holes 12 and multiple second cooling channels 31 are connected in a one-to-one correspondence. That is, one through hole 12 and one second cooling channel 31 are connected in a corresponding manner. This arrangement allows the cooling medium in the first cooling channel 11 to flow into the corresponding second cooling channel 31 through the corresponding through holes 12, which is beneficial for the uniform distribution of the cooling medium in the multiple second cooling channels 31. This allows the cooling medium to flow into the corresponding third cooling channel 211 and fourth cooling channel 212 through the multiple second cooling channels 31, which is beneficial for improving the uniformity of the distribution of the cooling medium in the multiple third cooling channel 211 and multiple fourth cooling channel 212. This results in uniform heat exchange for the multiple magnets 200, reduces the risk of excessive temperature difference between different magnets 200, reduces the temperature gradient in different parts of the rotor assembly 100, and improves the working stability of the rotor assembly 100.
[0063] The motor according to an embodiment of the present invention includes the rotor assembly 100 of the above embodiment. By providing a second cooling channel 31, and the second cooling channel 31 connecting the first cooling channel 11 and the magnet slot 21 of the adjacent first lamination 2, the cooling medium in the first cooling channel 11 can flow into the magnet slot 21 through the second cooling channel 31. This facilitates the cooling medium to directly cool the magnet 200 assembled in the magnet slot 21, thereby increasing the rated power of the motor. It also reduces the risk of thermal demagnetization due to excessive temperature of the magnet 200, thereby reducing the risk of motor thermal failure and improving the working reliability of the motor.
[0064] The vehicle according to this utility model embodiment includes the motor described in the above embodiment. The vehicle can be an electric vehicle or a hybrid vehicle. By providing a second cooling channel 31, and the second cooling channel 31 connecting the first cooling channel 11 and the magnet groove 21 of the adjacent first lamination 2, the cooling medium in the first cooling channel 11 can flow into the magnet groove 21 through the second cooling channel 31. This facilitates the cooling medium to directly cool the magnet 200 assembled in the magnet groove 21, thereby increasing the rated power of the motor. It also reduces the risk of thermal demagnetization due to excessive temperature of the magnet 200, thereby reducing the risk of motor thermal failure, improving the motor's operational reliability, and ultimately improving the vehicle's performance and service life, thus enhancing the vehicle's competitiveness.
[0065] 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.
[0066] 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 machine, characterized by include: A rotating shaft (1) having a first cooling channel (11) formed thereon; Multiple first stacked plates (2) are sleeved on the rotating shaft (1) and arranged along the axial direction of the rotating shaft (1). Each first stacked plate (2) forms a magnet groove (21) that passes through the first stacked plate (2) along the axial direction of the rotating shaft (1). The magnet groove (21) is used to install magnets (200). The magnet grooves (21) of any two adjacent first stacked plates (2) are connected. The second stack (3) is sleeved on the rotating shaft (1). The second stack (3) is provided between at least two adjacent first stacks (2). The second stack (3) forms a second cooling channel (31). The second cooling channel (31) connects the first cooling channel (11) and the magnet groove (21) of the adjacent first stack (2).
2. The rotor assembly (100) of claim 1, wherein Each of the first stack (2) has a third cooling channel (211) formed in the magnet groove (21) that runs through the first stack (2) along the axis of the rotating shaft (1). The third cooling channels (211) of two adjacent first stacks (2) are opposite to and connected along the axis of the rotating shaft (1). The second cooling channel (31) connects the first cooling channel (11) and the adjacent third cooling channel (211).
3. The rotor assembly (100) of claim 2, characterized in that Also includes: A rotor housing (4) is fitted onto the second lamination (3) and a plurality of first laminations (2). The rotor housing (4) and each of the first laminations (2) together define at least one fourth cooling channel (212) that penetrates the first lamination (2) along the axial direction of the rotating shaft (1). The fourth cooling channels (212) of two adjacent first laminations (2) are opposite to and connected along the axial direction of the rotating shaft (1). The second cooling channel (31) connects the first cooling channel (11) and the adjacent fourth cooling channel (212).
4. The rotor assembly (100) of claim 3, wherein The second cooling channel (31) includes: a connecting channel (311), a first sub-cooling channel (312), and a second sub-cooling channel (313). The first sub-cooling channel (312) and the second sub-cooling channel (313) are both connected to the first cooling channel (11) through the connecting channel (311). The first sub-cooling channel (312) connects the third cooling channel (211) and the connecting channel (311). The second sub-cooling channel (313) connects the fourth cooling channel (212) and the connecting channel (311).
5. The rotor assembly (100) of claim 4, wherein, Along the radial direction of the second stack (3), the first sub-cooling channel (312) and the second sub-cooling channel (313) are both located radially outside the connecting channel (311), the connecting channel (311) extends circumferentially along the second stack (3), the first sub-cooling channel (312) and the second sub-cooling channel (313) are arranged circumferentially along the second stack (3) and both extend radially along the second stack (3).
6. The rotor assembly (100) of claim 4, wherein, There are multiple first sub-cooling channels (312) and multiple third cooling channels (211), and the multiple first sub-cooling channels (312) and multiple third cooling channels (211) are arranged circumferentially along the rotating shaft (1) and are connected one-to-one; and / or There are multiple second sub-cooling channels (313) and multiple fourth cooling channels (212). The multiple second sub-cooling channels (313) and multiple fourth cooling channels (212) are arranged circumferentially along the rotating shaft (1) and are connected to each other.
7. The rotor assembly (100) according to any one of claims 1-6, characterized in that The rotating shaft (1) has a through hole (12) that connects the second cooling channel (31) and the first cooling channel (11).
8. The rotor assembly (100) of claim 7, wherein There are multiple through holes (12), and the multiple through holes (12) and the multiple second cooling channels (31) are connected in a one-to-one correspondence.
9. An electric machine characterized by Includes the rotor assembly (100) according to any one of claims 1-8.
10. A vehicle characterized by comprising: Includes the motor according to claim 9.