Rotor, motor, electric drive apparatus, electric drive system and electric device

Abstract

The present application provides a rotor (11), a motor (10), an electric drive apparatus (1), an electric drive system, and an electric device. The rotor (11) comprises a first retainer (111), a first magnet (112), and a heat conducting member (113). The first magnet (112) is mounted on the first retainer (111), and the heat conducting member (113) is connected between the first retainer (111) and a rotating shaft (13). The rotor (11) provided by the present application has both good heat dissipation performance and sufficient structural strength, thereby effectively improving the working performance of the motor (10).

Description

Rotors, motors, electric drive units, electric drive systems and electrical equipment

[0001] Cross-referencing

[0002] This application incorporates Chinese Patent Application No. 202411037464.X, filed on July 30, 2024, entitled “Rotor, Motor, Electric Drive Device, Electric Drive System and Electric Equipment”, which is incorporated herein by reference in its entirety. Technical Field

[0003] This application relates to the field of motor technology, specifically to a rotor, motor, electric drive device, electric drive system, and electric equipment. Background Technology

[0004] With increasing environmental pollution, new energy products are gaining popularity. Electric drive systems, as the power source for these products, convert electrical energy from batteries into mechanical energy to power them. As the core component of electric drive systems, improving the performance of the electric motor is a critical technical challenge that needs to be addressed in electric drive technology. Summary of the Invention

[0005] The purpose of this application is to provide a rotor, motor, electric drive device, electric drive system, and electric equipment to solve the technical problem of poor motor performance in related technologies.

[0006] To achieve the above objectives, the technical solution adopted in this application embodiment is: to provide a rotor coaxially connected to a rotating shaft, the rotor comprising:

[0007] First cage;

[0008] The first magnet is mounted on the first cage;

[0009] A heat-conducting component is connected between the first cage and the rotating shaft.

[0010] The rotor provided in this application embodiment has at least the following beneficial effects: By mounting the first magnet on the first cage and connecting the heat-conducting element between the first cage and the rotating shaft, the rotor provided in this application embodiment allows at least part of the heat generated by the first magnet to be conducted to the heat-conducting element through the first cage during rotor operation, and then to the rotating shaft through the heat-conducting element, thereby dissipating heat from the first magnet. At the same time, the first cage can effectively overcome the centrifugal force on the first magnet to fix the first magnet. Thus, the rotor has both good heat dissipation performance and sufficient structural strength, thereby effectively improving the working performance of the motor.

[0011] In some embodiments of this application, the heat-conducting element is coaxially connected to the rotating shaft, and the first retainer is sleeved on the outer periphery of the heat-conducting element.

[0012] By adopting the above technical solution, the heat conduction path between the first magnet and the rotating shaft is effectively shortened, further improving the heat dissipation performance of the rotor, thereby further enhancing the working performance of the motor.

[0013] In some embodiments of this application, the first retainer includes a first support ring and a second support ring. The first support ring is sleeved on the outer periphery of the second support ring and is separated from the second support ring to form an installation space. The first magnet is installed in the installation space, and the heat-conducting element is embedded in the inner ring space of the second support ring.

[0014] By adopting the above technical solution, not only is the heat conduction path between the first magnet and the shaft effectively shortened, but the centrifugal force on the first magnet can also be overcome by the first support ring, so that the rotor has both good heat dissipation performance and sufficient structural strength, thereby effectively improving the working performance of the motor.

[0015] In some embodiments of this application, the first retainer further includes a plurality of first support ribs connected between the first support ring and the second support ring. The plurality of first support ribs are arranged in a space around the central axis of the rotor to divide the installation space into a plurality of first mounting slots. The number of first magnets is plurality of, and the plurality of first magnets are installed in the plurality of first mounting slots one by one.

[0016] By adopting the above technical solutions, the structural strength of the rotor is further improved, thereby further enhancing the working performance of the motor.

[0017] In some embodiments of this application, the first retainer further includes two cover plates, which are disposed on opposite sides of the second support ring along the axial direction of the rotor and are thermally connected to the heat-conducting element.

[0018] By adopting the above technical solution, the contact area between the first cage and the heat-conducting component is effectively increased, further improving the heat dissipation performance of the rotor, thereby further enhancing the working performance of the motor.

[0019] In some embodiments of this application, the rotor further includes a second magnet mounted on a heat-conducting element.

[0020] By adopting the above technical solution, at least part of the heat generated by the second magnet can be directly conducted to the rotating shaft through the heat-conducting component, which further improves the heat dissipation performance of the rotor and thus further enhances the working performance of the motor.

[0021] In some embodiments of this application, the heat-conducting component has multiple second mounting slots, which are arranged around the central axis of the rotor. There are multiple second magnets, which are installed one-to-one in the multiple second mounting slots.

[0022] By adopting the above technical solution, not only can at least part of the heat generated by the second magnet be directly conducted to the rotating shaft through the heat-conducting component, but also, since the first retainer is sleeved on the outer periphery of the heat-conducting component, the first retainer can overcome the centrifugal force on the second magnet, so that the rotor has both good heat dissipation performance and sufficient structural strength, thereby further improving the working performance of the motor.

[0023] In some embodiments of this application, the heat-conducting component includes a heat-conducting body and a second retainer. The heat-conducting body is coaxially connected to the rotating shaft, and the second retainer is sleeved on the outer peripheral side of the heat-conducting body and connected between the outer peripheral wall of the heat-conducting body and the first retainer. A plurality of second mounting slots are formed on the second retainer.

[0024] By adopting the above technical solution, not only can at least part of the heat generated by the second magnet be directly conducted to the rotating shaft through the heat-conducting component, but it is also convenient to assemble the second magnet onto the heat-conducting component.

[0025] In some embodiments of this application, the second retainer includes a third support ring and a plurality of second support ribs. The third support ring is sleeved on the outer periphery of the heat-conducting body, and the plurality of second support ribs are arranged around the central axis of the rotor and connected between the outer peripheral wall of the third support ring and the first retainer to define a plurality of second mounting slots.

[0026] By adopting the above technical solutions, the structural strength of the rotor is further improved, thereby further enhancing the working performance of the motor.

[0027] In some embodiments of this application, the heat-conducting element is coaxially connected to the rotating shaft, and there are two first retainers. The two first retainers are respectively disposed on opposite sides of the heat-conducting element along the axial direction of the rotor and cooperate to clamp the heat-conducting element.

[0028] By adopting the above technical solution, the contact area between the first cage and the heat-conducting component is effectively increased, further improving the heat dissipation performance of the rotor, thereby further enhancing the working performance of the motor.

[0029] In some embodiments of this application, the first magnet is attached to a heat-conducting component.

[0030] By adopting the above technical solution, at least part of the heat generated by the first magnet can be directly conducted to the rotating shaft through the heat-conducting component, which further improves the heat dissipation performance of the rotor and thus further enhances the working performance of the motor.

[0031] In some embodiments of this application, the opposite end faces of the heat-conducting element along the axial direction of the rotor are stepped surfaces, and the first cage and / or the first magnet are in contact with the stepped surfaces.

[0032] By adopting the above technical solution, the contact area between the first cage and the heat-conducting component and / or between the first magnet and the heat-conducting component is effectively increased, further improving the heat dissipation performance of the rotor, thereby further enhancing the working performance of the motor.

[0033] In some embodiments of this application, the height of the stepped surface along the axial direction of the rotor gradually decreases from the center of the heat-conducting element to the edge of the heat-conducting element.

[0034] By adopting the above technical solution, the middle part of the heat-conducting component can have sufficient thickness, which effectively improves the connection strength between the heat-conducting component and the rotating shaft, thereby further improving the working performance of the motor.

[0035] In some embodiments of this application, the first retainer has a plurality of first mounting slots, the heat-conducting component has a plurality of second mounting slots, the plurality of first mounting slots and the plurality of second mounting slots are connected in a one-to-one correspondence to form a mounting cavity, and the number of first magnets is plurality of, the plurality of first magnets being installed in the plurality of mounting cavities in a one-to-one correspondence.

[0036] By adopting the above technical solution, at least part of the heat generated by the first magnet can be directly conducted to the rotating shaft through the heat-conducting component, which further improves the heat dissipation performance of the rotor and thus further enhances the working performance of the motor.

[0037] In some embodiments of this application, the rotor further includes a first magnetic plate and a second magnetic plate, which are respectively disposed on opposite sides of the first magnet along the axial direction of the rotor.

[0038] By adopting the above technical solutions, the leakage flux of the rotor is effectively improved, the eddy current loss of the rotor is reduced, and the magnetic field distribution in the air gap of the motor is optimized, thereby further improving the working performance of the motor.

[0039] In some embodiments of this application, the first cage is directly connected to the rotating shaft.

[0040] By adopting the above technical solution, at least a portion of the heat generated by the first magnet can be conducted to the heat-conducting component through the first cage, and then to the rotating shaft through the heat-conducting component. At least another portion of the heat generated by the first magnet can be directly conducted to the rotating shaft through the first cage. That is, there are at least two heat conduction paths between the first magnet and the rotating shaft, which further improves the heat dissipation performance of the rotor and thus further enhances the working performance of the motor.

[0041] In some embodiments of this application, the thermal conductivity of the heat-conducting element is greater than or equal to 50 W / (m·K).

[0042] By adopting the above technical solution, the heat dissipation performance of the rotor is further improved, thereby further enhancing the working performance of the motor.

[0043] This application also provides an electric motor, including a stator, a shaft, and a rotor as described in any of the above embodiments. The rotor is coaxially connected to the shaft, and the stator is magnetically coupled to the rotor to drive the rotor to rotate.

[0044] The motor provided in this application embodiment has at least the following beneficial effects: the motor provided in this application embodiment effectively improves the working performance of the motor by adopting the rotor described in any of the above embodiments.

[0045] In some embodiments of this application, a cooling channel is formed inside the rotating shaft, and the cooling channel is used to circulate the cooling medium.

[0046] By adopting the above technical solution, the cooling medium can carry away the heat on the shaft during the flow process, thereby effectively improving the heat dissipation performance of the motor.

[0047] This application also provides an electric drive device, including the motor described above.

[0048] The electric drive device provided in this application embodiment has at least the following beneficial effects: the electric drive device provided in this application embodiment effectively improves the working performance of the electric drive device by adopting the above-mentioned motor.

[0049] This application also provides an electric drive system, including a battery and the above-described electric drive device, wherein the battery is electrically connected to a motor.

[0050] The electric drive system provided in this application embodiment has at least the following beneficial effects: the electric drive system provided in this application embodiment effectively improves the working performance of the electric drive system by adopting the above-mentioned electric drive device.

[0051] This application also provides an electric device, including the above-described electric drive device or the above-described electric drive system.

[0052] The electric equipment provided in this application embodiment has at least the following beneficial effects: the electric equipment provided in this application embodiment effectively improves the working performance of the electric equipment by adopting the above-mentioned electric drive device or the above-mentioned electric drive system. Attached Figure Description

[0053] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art 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.

[0054] Figure 1 is a structural schematic diagram of the vehicle provided in an embodiment of this application;

[0055] Figure 2 is a schematic diagram of the exploded structure of the battery provided in an embodiment of this application;

[0056] Figure 3 is a schematic diagram of the structure of the electric drive device provided in an embodiment of this application;

[0057] Figure 4 is a schematic diagram of the structure of the motor provided in an embodiment of this application;

[0058] Figure 5 is a cross-sectional view of the motor shown in Figure 4 along line AA.

[0059] Figure 6 is a schematic diagram of the rotor provided in an embodiment of this application;

[0060] Figure 7 is a schematic diagram of the exploded structure of the rotor shown in Figure 6;

[0061] Figure 8 is a schematic diagram of the main structure of the rotor shown in Figure 6;

[0062] Figure 9 is a schematic cross-sectional view of the rotor shown in Figure 8 along the BB line.

[0063] Figure 10 is an exploded structural diagram of a rotor provided in another embodiment of this application;

[0064] Figure 11 is a schematic diagram of the overall structure of the rotor shown in Figure 10;

[0065] Figure 12 is a schematic cross-sectional view of the rotor shown in Figure 11 along the CC line.

[0066] Figure 13 is an exploded structural diagram of a rotor provided in another embodiment of this application;

[0067] Figure 14 is a schematic diagram of the overall structure of the rotor shown in Figure 13;

[0068] Figure 15 is a schematic cross-sectional view of the rotor shown in Figure 14 along the DD line.

[0069] Figure 16 is an exploded structural diagram of a rotor provided in another embodiment of this application;

[0070] Figure 17 is a schematic diagram of the overall structure of the rotor shown in Figure 16;

[0071] Figure 18 is a schematic cross-sectional view of the rotor shown in Figure 17 along the EE line.

[0072] Figure 19 is a radial cross-sectional view of the rotor provided in another embodiment of this application;

[0073] Figure 20 is a schematic diagram of the heat-conducting component in the rotor shown in Figure 19.

[0074] In the figures, the following reference numerals are used: 1. Electric drive device; 10. Motor; 11. Rotor; 111. First cage; 1111. First support ring; 1112. Second support ring; 1113. First support rib; 1114. Mounting space; 1115. First mounting groove; 1116. Cover plate; 112. First magnet; 113. Heat-conducting component; 1131. Heat-conducting body; 1132. Second cage; 11321. Third support ring; 11322. Second support rib; 11323. Second mounting groove; 1133. Boss; 114. Second magnet; 115. First magnetic guide plate; 116. Second magnetic guide plate; 117. Sleeve; 12. Stator; 13. Rotating shaft; 131. Cooling channel; 20. Controller; 30. Speed ​​change mechanism; 2. Battery; 21. Box body; 211. First part; 212. Second part; 22. Battery cell; 3. Vehicle body. Detailed Implementation

[0075] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0076] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0077] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0078] Furthermore, the terms "first," "second," "third," "fourth," "fifth," "sixth," "seventh," "eighth," "ninth," and "tenth" 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 with "first," "second," "third," "fourth," "fifth," "sixth," "seventh," "eighth," "ninth," and "tenth" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0079] An electric motor is the power unit of an electric device. It is used to convert electrical energy into mechanical energy to drive the operation of the electric device.

[0080] An electric motor typically consists of a stator, a rotor, and a shaft. The stator usually includes an iron core and windings, with the windings wound around the iron core. The rotor typically includes a cage and magnets; the cage is coaxially connected to the shaft, and the magnets are mounted on the cage. During motor operation, current flows through the stator windings, generating a rotating magnetic field. The rotor, situated within this rotating magnetic field, rotates due to the interaction between this field and the magnetic field of the magnets, thus driving the shaft to rotate synchronously. Because the rotating magnetic field changes, induced currents are generated inside the magnets during these changes. These induced currents are commonly referred to as eddy currents. As these eddy currents flow within the magnets, they generate resistive losses, causing the magnets to heat up.

[0081] In related technologies, the heat generated by the magnet is usually conducted to the shaft through the cage to dissipate heat from the magnet. However, in order to effectively fix and support the magnet, the cage is usually made of high-strength material, but high-strength materials generally have low thermal conductivity, which makes it difficult to meet the heat dissipation requirements of the magnet and is not conducive to improving the working performance of the motor.

[0082] To improve the working performance of the motor, the rotor provided in this application mounts a first magnet on a first cage and connects a heat-conducting element between the first cage and the shaft. During the operation of the rotor, at least part of the heat generated by the first magnet can be conducted through the first cage to the heat-conducting element, and then through the heat-conducting element to the shaft, thereby dissipating heat from the first magnet. At the same time, the first cage can effectively overcome the centrifugal force on the first magnet to fix the first magnet. Thus, the rotor has both good heat dissipation performance and sufficient structural strength, thereby effectively improving the working performance of the motor.

[0083] The technical solutions described in this application are applicable to electric drive devices using motors and electric equipment using electric drive devices. The electric equipment can be, but is not limited to, vehicles, ships, spacecraft, and electric toys, etc. Vehicles can be gasoline-powered vehicles, natural gas-powered vehicles, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as electric car toys, electric ship toys, and electric airplane toys, etc.

[0084] For ease of explanation, the following embodiments will use a vehicle as an example of the electric device in one embodiment of this application.

[0085] Please refer to Figure 1, which is a structural schematic diagram of the vehicle provided in this embodiment. The vehicle includes a body 3, a battery 2, and an electric drive unit 1. The body 3 is the main supporting component of the vehicle, and has an engine compartment and a passenger compartment. The engine compartment is used to house the electric drive unit 1, and the passenger compartment provides operating and seating space for the driver and passengers. When the vehicle is a front-wheel drive vehicle, the engine compartment is located at the front of the body 3, i.e., the engine compartment is the front engine compartment; when the vehicle is a rear-wheel drive vehicle, the engine compartment is located at the rear of the body 3, i.e., the engine compartment is the rear engine compartment; when the vehicle is a four-wheel drive vehicle, the engine compartment is divided into a front engine compartment and a rear engine compartment, with the front engine compartment located at the front of the body 3 and the rear engine compartment located at the rear of the body 3. There can be two electric drive units 1, one in the front engine compartment and one in the rear engine compartment. The battery 2 and the electric drive unit 1 together constitute the electric drive system of the vehicle. Battery 2 can be located at the bottom, front, or rear of the vehicle. Battery 2 can supply power to electric drive unit 1 to drive electric drive unit 1. Electric drive unit 1 is used to convert the electrical energy provided by battery 2 into mechanical energy and output the mechanical energy to the wheels of the vehicle to drive the vehicle.

[0086] Please refer to Figure 2, which is an exploded view of the battery 2 provided in an embodiment of this application. The battery 2 includes a housing 21 and a battery cell 22, with the battery cell 22 housed within the housing 21. The housing 21 provides a space for the battery cell 22, and can have various structures. In some embodiments, the housing 21 may include a first portion 211 and a second portion 212, which overlap each other, jointly defining a space for accommodating the battery cell 22. The second portion 212 may be a hollow structure with one open end, and the first portion 211 may be a plate-like structure, covering the open side of the second portion 212 so that the first portion 211 and the second portion 212 jointly define the space. Alternatively, the first portion 211 and the second portion 212 may both be hollow structures with one open side, with the open side of the first portion 211 covering the open side of the second portion 212 so that the first portion 211 and the second portion 212 jointly define the space. Of course, the box 21 formed by the first part 211 and the second part 212 can be of various shapes, such as cylinder, cuboid, etc., and no specific limitation is made here.

[0087] In some embodiments, the housing 21 may be part of the vehicle's chassis structure. For example, a portion of the housing 21 may be at least a portion of the vehicle's floor, or a portion of the housing 21 may be at least a portion of the vehicle's crossbeams and longitudinal beams.

[0088] Of course, in some embodiments, the battery 2 may not include the housing 21, but rather multiple battery cells 22 are electrically connected and assembled into the vehicle after being formed into a whole by necessary fixing structures.

[0089] In battery 2, there can be multiple battery cells 22, which can be connected in series, parallel, or in a mixed manner. A mixed connection means that multiple battery cells 22 are connected in both series and parallel configurations. Multiple battery cells 22 can be directly connected in series, parallel, or in a mixed manner, and then the entire assembly of the multiple battery cells 22 is housed within the casing 21. Alternatively, battery 2 can also consist of multiple battery cells 22 first connected in series, parallel, or in a mixed manner to form a battery module, and then multiple battery modules connected in series, parallel, or in a mixed manner to form a whole, which is also housed within the casing 21. Battery 2 may also include other functional components; for example, it may include a busbar for electrical connection between the multiple battery cells 22.

[0090] Each battery cell 22 can be a secondary battery cell or a primary battery cell. A secondary battery cell refers to a battery cell 22 that can be recharged to activate its active materials and continue to be used after being discharged. A primary battery cell refers to a battery cell 22 that cannot be recharged to activate its active materials and continue to be used after its electrical energy is depleted. The battery cell 22 can also be a lithium-ion battery cell, a sodium-ion battery cell, a sodium-lithium-ion battery cell, a lithium metal battery cell, a sodium metal battery cell, a lithium-sulfur battery cell, a magnesium-ion battery cell, a nickel-metal hydride battery cell, a nickel-cadmium battery cell, a lead-acid battery cell, etc., but is not limited thereto. The battery cell 22 can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell 22 of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic battery cells, such as hexagonal prismatic battery cells, etc. This application does not have any particular limitations.

[0091] Please refer to Figure 3, which is a schematic diagram of the structure of the electric drive device 1 provided in an embodiment of this application. The electric drive device 1 includes a motor 10, which converts the electrical energy provided by the battery 2 into mechanical energy. Specifically, the motor 10 typically includes a stator 12, a rotor 11, and a shaft 13, with the rotor 11 coaxially connected to the shaft 13. During the operation of the motor 10, current flows through the windings of the stator 12, causing the windings to generate a rotating magnetic field. Under the action of the rotating magnetic field, the rotor 11 rotates, driving the shaft 13 to rotate synchronously, thereby converting electrical energy into mechanical energy and outputting the mechanical energy. The motor 10 can be, but is not limited to, an axial flux motor, a radial flux motor, a servo motor, a brushed motor, a brushless motor, etc. In some embodiments, the motor 10 is an axial flux motor. As an example, please refer to Figure 4, where there are two rotors 11, both of which are coaxially connected to the shaft 13 and are located on opposite sides of the stator 12 along the axial direction of the motor 10. As an example, there are two stators 12, which are respectively disposed on opposite sides of the rotor 11 along the axial direction of the motor 10. In some embodiments, there are two motors 10, which are coaxially arranged, that is, the central axes of the two motors 10 coincide. The "central axis" of the motor 10 refers to the axial center line of the rotating shaft 13 (or "rotor shaft") of the motor 10. As an example, the rotating shaft 13 of one motor 10 is connected to one of the left front wheel and the right front wheel of the vehicle, and the rotating shaft 13 of the other motor 10 is connected to the other of the left front wheel and the right front wheel of the vehicle; or, the rotating shaft 13 of one motor 10 is connected to one of the left rear wheel and the right rear wheel of the vehicle, and the rotating shaft 13 of the other motor 10 is connected to the other of the left rear wheel and the right rear wheel of the vehicle. During the operation of the electric drive device 1, the rotational speeds of the two motors 10 can be the same or different.

[0092] Of course, in other embodiments, the number of motors 10 may also be one.

[0093] In some embodiments, the electric drive device 1 may further include a controller 20. The controller 20 is used to convert the direct current output by the battery 2 into alternating current and transmit the alternating current to the motor 10. The controller 20 may also be used to control the operation of the motor 10, for example, to control the start / stop, speed, torque, etc. of the motor 10. In other words, both the motor 10 and the battery 2 are electrically connected to the controller 20. The direct current output by the battery 2 can be transmitted to the controller 20 through the current transmission path between the battery 2 and the controller 20. After the controller 20 converts the direct current into alternating current, the alternating current can be transmitted to the motor 10 through the current transmission path between the controller 20 and the motor 10 to drive the motor 10 to operate. At the same time, the control signal of the controller 20 can be transmitted to the motor 10 through the current transmission path between the controller 20 and the motor 10, and the operating status signal of the motor 10 can be transmitted to the controller 20 through the current transmission path between the controller 20 and the motor 10 to realize the controller 20 controlling the operation of the motor 10.

[0094] In some embodiments, the electric drive device 1 may further include a transmission mechanism 30, which transmits the mechanical energy to the vehicle wheels by changing the rotational speed and torque of the motor 10. For example, the transmission mechanism 30 transmits the mechanical energy to the vehicle wheels by decreasing the rotational speed of the motor 10 and increasing the torque of the motor 10; or, for instance, the transmission mechanism 30 transmits the mechanical energy to the vehicle wheels by increasing the rotational speed of the motor 10 and decreasing the torque of the motor 10. The transmission mechanism 30 may be, but is not limited to, a gear transmission mechanism, a worm gear transmission mechanism, a planetary gear transmission mechanism, a continuously variable transmission mechanism, etc.

[0095] To illustrate the technical solutions provided in this application, the following detailed description is provided in conjunction with specific drawings and embodiments.

[0096] Firstly, please refer to Figures 6 to 9 together. This application provides a rotor 11, including a first cage 111, a first magnet 112 and a heat-conducting element 113. The first magnet 112 is mounted on the first cage 111, and the heat-conducting element 113 is connected between the first cage 111 and the rotating shaft 13.

[0097] The first retainer 111 is a component used to fix and support the first magnet 112. The first retainer 111 can be made of a high-strength material, which can be, but is not limited to, low-carbon steel, stainless steel, bakelite, nylon, etc. The first retainer 111 can be a one-piece molded component; for example, the first retainer 111 can be integrally molded using a casting process. The first retainer 111 can also comprise multiple components, each individually molded and then connected to form a whole.

[0098] In some embodiments, the outer periphery of the first retainer 111 is circular, and the first retainer 111 is coaxially arranged with the rotating shaft 13, that is, the central axis of the first retainer 111 coincides with the central axis of the rotating shaft 13. Of course, considering the existence of manufacturing tolerances, there may be a slight deviation between the central axis of the first retainer 111 and the central axis of the rotating shaft 13.

[0099] The first magnet 112 is a component used to generate a magnetic field. The first magnet 112 can be made of a permanent magnet material, which can be, but is not limited to, neodymium iron boron, cobalt, and alnico. During the operation of the motor 10, current flows through the windings of the stator 12, causing the windings to generate a rotating magnetic field. Under the interaction of the magnetic field of the first magnet 112 and the rotating magnetic field, the rotor 11 rotates, thereby driving the shaft 13 to rotate synchronously.

[0100] In some embodiments, the first retainer 111 has a first mounting groove 1115, and the first magnet 112 is fixedly mounted in the first mounting groove 1115. As an example, the first magnet 112 can be bonded to the first mounting groove 1115 with an adhesive, which can be a thermally conductive adhesive, to conduct the heat generated by the first magnet 112 to the first retainer 111.

[0101] In some embodiments, there are multiple first magnets 112, which are arranged at intervals around the central axis of the rotating shaft 13, with equal spacing between any two adjacent first magnets 112. Correspondingly, there are also multiple first mounting slots 1115, with each of the multiple first magnets 112 corresponding to one of the multiple first mounting slots 1115.

[0102] The heat-conducting component 113 is a component used to conduct heat from the first retainer 111 to the rotating shaft 13. During the operation of the motor 10, at least part of the heat generated by the first magnet 112 can be conducted through the first retainer 111 to the heat-conducting component 113, and then through the heat-conducting component 113 to the rotating shaft 13.

[0103] The heat-conducting component 113 is made of a heat-conducting material. In some embodiments, the heat-conducting material can be a metallic or non-metallic material with a thermal conductivity greater than or equal to 50 W / (m·K), such as copper, aluminum, aluminum alloy, silver, diamond, graphite, etc.

[0104] In some embodiments, the heat-conducting element 113 is made of copper or aluminum, and the first retainer 111 is made of low-carbon steel or stainless steel.

[0105] In some embodiments, the heat-conducting element 113 can be bonded to the rotating shaft 13 by an adhesive, and can also be bonded to the first retainer 111 by an adhesive. The adhesive can be a thermally conductive adhesive, that is, the heat in the first retainer 111 is conducted to the heat-conducting element 113 through the thermally conductive adhesive, and the heat in the heat-conducting element 113 is conducted to the rotating shaft 13 through the thermally conductive adhesive.

[0106] In other embodiments, the heat-conducting element 113 may be welded to the rotating shaft 13 and also to the first retainer 111.

[0107] The rotor 11 provided in this application embodiment has a first magnet 112 mounted on a first cage 111 and a heat-conducting element 113 connected between the first cage 111 and the rotating shaft 13. During the operation of the rotor 11, at least part of the heat generated by the first magnet 112 can be conducted through the first cage 111 to the heat-conducting element 113, and then through the heat-conducting element 113 to the rotating shaft 13, so as to dissipate heat from the first magnet 112. At the same time, the first cage 111 can effectively overcome the centrifugal force on the first magnet 112 to fix the first magnet 112. In this way, the rotor 11 has both good heat dissipation performance and sufficient structural strength, thereby effectively improving the working performance of the motor 10.

[0108] In some embodiments of this application, please refer to FIG9, the heat-conducting element 113 is coaxially connected with the rotating shaft 13, and the first retainer 111 is sleeved on the outer peripheral side of the heat-conducting element 113.

[0109] In some embodiments, the heat-conducting element 113 has a ring structure, and the rotating shaft 13 passes through the inner hole of the heat-conducting element 113 and is coaxially connected to the heat-conducting element 113, that is, the central axis of the heat-conducting element 113 coincides with the central axis of the rotating shaft 13, and the outer peripheral wall of the rotating shaft 13 is connected to the inner hole wall of the heat-conducting element 113. Of course, considering the existence of manufacturing tolerances, there may be a slight deviation between the central axis of the heat-conducting element 113 and the central axis of the rotating shaft 13.

[0110] In some embodiments, both the heat-conducting element 113 and the first retainer 111 are annular structures. The heat-conducting element 113 is disposed in the inner annular space of the first retainer 111 and coaxially connected to the first retainer 111, that is, the central axis of the heat-conducting element 113 coincides with the central axis of the first retainer 111, and the outer peripheral wall of the heat-conducting element 113 is connected to the inner peripheral wall of the first retainer 111. Of course, considering the existence of manufacturing tolerances, there may be a slight deviation between the central axis of the heat-conducting element 113 and the central axis of the first retainer 111.

[0111] By adopting the above technical solution, the heat in the first cage 111 can be conducted to the rotating shaft 13 along the radial direction of the rotor 11 through the heat-conducting element 113, which effectively shortens the heat conduction path between the first magnet 112 and the rotating shaft 13, further improves the heat dissipation performance of the rotor 11, and thus further enhances the working performance of the motor 10.

[0112] In some embodiments of this application, please refer to FIG7. The first retainer 111 includes a first support ring 1111 and a second support ring 1112. The first support ring 1111 is sleeved on the outer periphery of the second support ring 1112 and is separated from the second support ring 1112 to form an installation space 1114. The first magnet 112 is installed in the installation space 1114, and the heat-conducting element 113 is embedded in the inner ring space of the second support ring 1112.

[0113] The first support ring 1111 and the second support ring 1112 together constitute the support body of the first cage 111. The separation of the first support ring 1111 and the second support ring 1112 to form the mounting space 1114 means that, in the radial direction of the rotor 11, there is a gap between the inner peripheral wall of the first support ring 1111 and the outer peripheral wall of the second support ring 1112, and this gap constitutes the aforementioned mounting space 1114. It can be understood that the aforementioned first mounting groove 1115 is a part of this mounting space 1114.

[0114] In some embodiments, the heat-conducting element 113, the first support ring 1111, and the second support ring 1112 are all circular ring structures. The second support ring 1112 is disposed in the inner ring space of the first support ring 1111 and is coaxially disposed with the first support ring 1111, that is, the central axis of the first support ring 1111 coincides with the central axis of the second support ring 1112. The heat-conducting element 113 is disposed in the inner ring space of the second support ring 1112 and is coaxially connected with the second support ring 1112, that is, the central axis of the heat-conducting element 113 coincides with the central axis of the second support ring 1112, and the outer peripheral wall of the heat-conducting element 113 is connected with the inner peripheral wall of the second support ring 1112.

[0115] By adopting the above technical solution, not only is the heat conduction path between the first magnet 112 and the rotating shaft 13 effectively shortened, but the centrifugal force on the first magnet 112 can also be overcome by the first support ring 1111, so that the rotor 11 has both good heat dissipation performance and sufficient structural strength, thereby effectively improving the working performance of the motor 10.

[0116] In some embodiments of this application, please refer to FIG7. The first retainer 111 further includes a plurality of first support ribs 1113 connected between the first support ring 1111 and the second support ring 1112. The plurality of first support ribs 1113 are arranged to surround the central axis of the rotor 11 to divide the mounting space 1114 into a plurality of first mounting slots 1115. The number of first magnets 112 is plurality of, and the plurality of first magnets 112 are installed in the plurality of first mounting slots 1115 in a one-to-one correspondence.

[0117] The first support rib 1113 is used to connect the first support ring 1111 and the second support ring 1112, and to divide the installation space 1114 into multiple first installation grooves 1115. Specifically, one end of the first support rib 1113 is connected to the inner peripheral wall of the first support ring 1111, and the other end of the first support rib 1113 is connected to the outer peripheral wall of the second support ring 1112. The first support rib 1113, the first support ring 1111, and the second support ring 1112 can be integrally formed, for example, the first support rib 1113, the first support ring 1111, and the second support ring 1112 can be integrally formed by casting process, or the first support rib 1113, the first support ring 1111, and the second support ring 1112 can be formed separately and then connected into a whole, for example, the first support rib 1113, the first support ring 1111, and the second support ring 1112 can be formed separately and then welded into a whole. The number of first support ribs 1113 can be determined according to the required number of first magnets 112. For example, if there are 8 first magnets 112, the number of first support ribs 1113 is also 8.

[0118] In some embodiments, the length direction of the first support rib 1113 is parallel to the radial direction of the rotor 11, and a plurality of first support ribs 1113 are evenly distributed around the central axis of the rotor 11, that is, along the circumference of the rotor 11, the spacing between each two adjacent first support ribs 1113 is equal, so that the dimensions of each first mounting groove 1115 are equal.

[0119] By adopting the above technical solution, the structural strength of rotor 11 is further improved, thereby further enhancing the working performance of motor 10.

[0120] In some embodiments of this application, please refer to Figures 10 to 12 together. The first retainer 111 also includes two cover plates 1116. The two cover plates 1116 are respectively disposed on opposite sides of the second support ring 1112 along the axial direction of the rotor 11 and are thermally connected to the heat-conducting element 113.

[0121] Cover plate 1116 is a component used to seal the inner annular space of the second support ring 1112. One cover plate 1116 is disposed on one side of the second support ring 1112 along the axial direction of the shaft 13, and another cover plate 1116 is disposed on the other side of the second support ring 1112 along the axial direction of the shaft 13. Both cover plates 1116 are connected to the second support ring 1112. As an example, cover plate 1116 is bonded to the second support ring 1112. As an example, cover plate 1116 is welded to the second support ring 1112.

[0122] The thermal connection between the cover plate 1116 and the heat-conducting component 113 means that there is a heat conduction path between the cover plate 1116 and the heat-conducting component 113, and the heat generated by the first magnet 112 can be conducted to the heat-conducting component 113 in sequence through the second support ring 1112 and the cover plate 1116.

[0123] In some embodiments, the cover plate 1116 is in direct contact with the heat-conducting element 113. As an example, the surface of the cover plate 1116 facing the heat-conducting element 113 is flat, and the surface of the heat-conducting element 113 facing the cover plate 1116 is also flat. The cover plate 1116 and the heat-conducting element 113 are in close contact with each other so that the heat in the cover plate 1116 can be directly conducted to the heat-conducting element 113.

[0124] In other embodiments, thermally conductive adhesive is provided between the cover plate 1116 and the heat-conducting element 113, and the heat in the cover plate 1116 can be conducted to the heat-conducting element 113 through the thermally conductive adhesive.

[0125] By adopting the above technical solution, the contact area between the first retainer 111 and the heat-conducting component 113 is effectively increased, further improving the heat dissipation performance of the rotor 11, thereby further enhancing the working performance of the motor 10.

[0126] In some embodiments of this application, please refer to Figures 13 to 15 together. The rotor 11 also includes a second magnet 114, which is mounted on the heat-conducting element 113.

[0127] The second magnet 114 is a component used to generate a magnetic field. The magnetic field of the second magnet 114 and the magnetic field of the first magnet 112 are superimposed to form the magnetic field of the rotor 11. The second magnet 114 can be made of permanent magnet material, which can be, but is not limited to, neodymium iron boron, cobalt, and alnico. During the operation of the motor 10, current flows through the windings of the stator 12, causing the windings to generate a rotating magnetic field. Under the interaction of the magnetic field of the rotor 11 and this rotating magnetic field, the rotor 11 rotates, thereby driving the shaft 13 to rotate synchronously.

[0128] The second magnet 114 is mounted on the heat-conducting component 113, meaning that the heat generated by the second magnet 114 can be conducted to the heat-conducting component 113 without passing through the first retainer 111.

[0129] It should be noted that the first retainer 111 is sleeved on the outer periphery of the heat-conducting component 113, and the second magnet 114 is mounted on the heat-conducting component 113. During the rotation of the rotor 11, the first retainer 111 can overcome the centrifugal force on the second magnet 114, thereby reducing the risk of the second magnet 114 being thrown out.

[0130] By adopting the above technical solution, at least part of the heat generated by the second magnet 114 can be directly conducted to the rotating shaft 13 through the heat-conducting component 113, which further improves the heat dissipation performance of the rotor 11 and thus further enhances the working performance of the motor 10.

[0131] In some embodiments of this application, please refer to FIG13. The heat-conducting component 113 has a plurality of second mounting slots 11323. The plurality of second mounting slots 11323 are arranged in a way that surrounds the central axis of the rotor 11. The number of second magnets 114 is plurality of, and the plurality of second magnets 114 are installed in the plurality of second mounting slots 11323 in a one-to-one correspondence.

[0132] The second mounting slot 11323 is used to provide mounting space 1114 for the second magnet 114. The number of second mounting slots 11323 can be determined according to the number of second magnets 114 required. For example, if there are 8 second magnets 114, the number of second mounting slots 11323 is also 8.

[0133] In some embodiments, a plurality of second mounting slots 11323 are evenly distributed around the central axis of the rotor 11, that is, the spacing between each two adjacent second mounting slots 11323 is equal along the circumference of the rotor 11, so that a plurality of second magnets 114 are evenly distributed around the central axis of the rotor 11.

[0134] In some embodiments, a plurality of second mounting slots 11323 and a plurality of first mounting slots 1115 are distributed radially along the rotor 11 in a one-to-one correspondence.

[0135] By adopting the above technical solution, not only can at least part of the heat generated by the second magnet 114 be directly conducted to the rotating shaft 13 through the heat-conducting component 113, but also, since the first retainer 111 is sleeved on the outer periphery of the heat-conducting component 113, the first retainer 111 can overcome the centrifugal force on the second magnet 114, so that the rotor 11 has both good heat dissipation performance and sufficient structural strength, thereby further improving the working performance of the motor 10.

[0136] In some embodiments of this application, please refer to Figures 13 and 15 together. The heat-conducting component 113 includes a heat-conducting body 1131 and a second retainer 1132. The heat-conducting body 1131 is coaxially connected to the rotating shaft 13. The second retainer 1132 is sleeved on the outer peripheral side of the heat-conducting body 1131 and connected between the outer peripheral wall of the heat-conducting body 1131 and the first retainer 111. A plurality of second mounting grooves 11323 are formed on the second retainer 1132.

[0137] The heat-conducting body 1131 is the main part of the heat-conducting component 113. The heat-conducting body 1131 is used to connect the rotating shaft 13 to conduct heat to the rotating shaft 13. The second retainer 1132 is a component used to fix and support the second magnet 114.

[0138] In some embodiments, the heat-conducting body 1131, the second retainer 1132, and the rotating shaft 13 are all coaxially arranged.

[0139] In some embodiments, the heat-conducting body 1131 and the second retainer 1132 are both made of heat-conducting material. The heat-conducting body 1131 and the second retainer 1132 can be formed separately and then connected into a whole. For example, the heat-conducting body 1131 and the second retainer 1132 can be formed separately and then welded into a whole. As an example, the heat-conducting body 1131 and the second retainer 1132 can also be integrally formed. For example, the heat-conducting body 1131 and the second retainer 1132 can be integrally formed by casting process.

[0140] By adopting the above technical solution, not only can at least part of the heat generated by the second magnet 114 be directly conducted to the rotating shaft 13 through the heat-conducting component 113, but it is also convenient to assemble the second magnet 114 onto the heat-conducting component 113.

[0141] In some embodiments of this application, please refer to Figures 13 and 15 together. The second retainer 1132 includes a third support ring 11321 and a plurality of second support ribs 11322. The third support ring 11321 is sleeved on the outer periphery of the heat-conducting body 1131. The plurality of second support ribs 11322 are arranged around the central axis of the rotor 11 and connected between the outer periphery of the third support ring 11321 and the first retainer 111 to define a plurality of second mounting grooves 11323.

[0142] The third support ring 11321 is the main body of the second retainer 1132. The second support rib 11322 is a component used to connect the third support ring 11321 and the first retainer 111. The second support rib 11322 and the third support ring 11321 can be integrally formed, for example, by casting. Alternatively, the second support rib 11322 and the third support ring 11321 can be formed separately and then connected to form a whole, for example, by welding them together after they are formed separately. The connection method between the second support rib 11322 and the first retainer 111 can be, but is not limited to, welding or bonding.

[0143] In some embodiments, the first retainer 111 includes a first support ring 1111, a second support ring 1112, and a plurality of first support ribs 1113. The second support ring 1112 is disposed in the inner ring space of the first support ring 1111 and is separated from the first support ring 1111. A third support ring 11321 is disposed in the inner ring space of the second support ring 1112 and is separated from the second support ring 1112. A heat-conducting body 1131 is disposed in the inner ring space of the third support ring 11321. The first support ring 1111, the second support ring 1112, the third support ring 11321, the heat-conducting body 1131, and the rotating shaft 13 are all coaxially arranged. The plurality of first support ribs 1113 are arranged around the central axis of the rotor 11 and connected between the inner peripheral wall of the first support ring 1111 and the outer peripheral wall of the second support ring 1112 to define a plurality of first mounting grooves 1115. Multiple second support ribs 11322 are arranged around the central axis of rotor 11 and connected between the inner peripheral wall of second support ring 1112 and the outer peripheral wall of third support ring 11321 to define multiple second mounting grooves 11323.

[0144] By adopting the above technical solution, the structural strength of rotor 11 is further improved, thereby further enhancing the working performance of motor 10.

[0145] In some other embodiments of this application, please refer to Figures 16 to 18. The heat-conducting element 113 is coaxially connected to the rotating shaft 13. There are two first retainers 111. The two first retainers 111 are respectively disposed on opposite sides of the heat-conducting element 113 along the axial direction of the rotor 11 and cooperate to clamp the heat-conducting element 113.

[0146] In some embodiments, the outer peripheral contour shape of the heat-conducting element 113 and the outer peripheral contour shape of the two first retainers 111 are both circular, the heat-conducting element 113 and the two first retainers 111 are coaxially arranged, and the diameter of the heat-conducting element 113 is equal to the diameter of the two first retainers 111.

[0147] In some embodiments, the two first retainers 111 may be in direct contact with the heat-conducting element 113 to hold the heat-conducting element 113. As an example, both first retainers 111 are welded to the heat-conducting element 113.

[0148] In some other embodiments, a heat-conducting structure may be provided between the first retainer 111 and the heat-conducting element 113. For example, a heat-conducting adhesive may be provided between the first retainer 111 and the heat-conducting element 113.

[0149] By adopting the above technical solution, the contact area between the first retainer 111 and the heat-conducting component 113 is effectively increased, further improving the heat dissipation performance of the rotor 11, thereby further enhancing the working performance of the motor 10.

[0150] In some embodiments of this application, please refer to FIG18, the first magnet 112 is attached to the heat-conducting component 113.

[0151] The first magnet 112 being attached to the heat-conducting component 113 means that the first magnet 112 is in direct contact with the heat-conducting component 113, and the heat generated by the first magnet 112 can be directly conducted to the heat-conducting component 113.

[0152] In some embodiments, the heat-conducting element 113 has a plate-like structure, and the first magnet 112 mounted on a first retainer 111 is attached to one plate surface of the heat-conducting element 113 along the axial direction of the rotor 11, and the first magnet 112 mounted on another first retainer 111 is attached to another plate surface of the heat-conducting element 113 along the axial direction of the rotor 11.

[0153] By adopting the above technical solution, at least part of the heat generated by the first magnet 112 can be directly conducted to the rotating shaft 13 through the heat-conducting component 113, which further improves the heat dissipation performance of the rotor 11 and thus further enhances the working performance of the motor 10.

[0154] In some embodiments of this application, please refer to Figures 19 and 20 together. The opposite end faces of the heat-conducting element 113 along the axial direction of the rotor 11 are stepped surfaces, and the first retainer 111 is in contact with the stepped surfaces.

[0155] In some other embodiments of this application, please refer to Figures 19 and 20 together. The opposite end faces of the heat-conducting element 113 along the axial direction of the rotor 11 are stepped surfaces, and the first magnet 112 is in contact with the stepped surface.

[0156] In some other embodiments of this application, please refer to Figures 19 and 20 together. The opposite end faces of the heat-conducting element 113 along the axial direction of the rotor 11 are stepped surfaces, and the first retainer 111 and the first magnet 112 are in contact with the stepped surfaces.

[0157] Understandably, the heat-conducting component 113 has multiple bosses 1133 on both opposite end faces along the axial direction of the rotor 11. The height of the multiple bosses 1133 on one end face decreases or increases sequentially along the axial direction of the rotor 11, so that the heat-conducting component 113 has a stepped surface on both opposite end faces along the axial direction of the rotor 11.

[0158] In some embodiments, the surface of the first retainer 111 facing the heat-conducting element 113 is also a stepped surface, and the stepped surface of the first retainer 111 and the stepped surface of the heat-conducting element 113 are in concave-convex fit to make the first retainer 111 and the heat-conducting element 113 fit together.

[0159] In some embodiments, the surface of the first magnet 112 facing the heat-conducting element 113 is also a stepped surface, and the stepped surface of the first magnet 112 and the stepped surface of the heat-conducting element 113 are in concave-convex fit to make the first magnet 112 and the heat-conducting element 113 fit together.

[0160] By adopting the above technical solution, the contact area between the first retainer 111 and the heat-conducting component 113 and between the first magnet 112 and the heat-conducting component 113 is effectively increased, further improving the heat dissipation performance of the rotor 11, thereby further enhancing the working performance of the motor 10.

[0161] In some embodiments of this application, please refer to Figures 19 and 20 together. The height of the stepped surface along the axial direction of the rotor 11 gradually decreases from the center of the heat-conducting element 113 to the edge of the heat-conducting element 113.

[0162] In this embodiment, one end face of the heat-conducting element 113 is used as an example. The first boss 1133 is a protrusion 1133 located in the middle of the heat-conducting element 113. The second boss 1133 surrounds the first boss 1133, the third boss 1133 surrounds the second boss 1133, and so on. The gradual decrease in height of the stepped surface along the axial direction of the rotor 11 from the middle of the heat-conducting element 113 to its edge means that, in the direction from the middle of the heat-conducting element 113 to its edge, the height of the first boss 1133 is greater than the height of the second boss 1133, the height of the second boss 1133 is greater than the height of the third boss 1133, and so on. The rotating shaft 13 can pass through the first boss 1133.

[0163] By adopting the above technical solution, the middle part of the heat-conducting component 113 can have sufficient thickness, which effectively improves the connection strength between the heat-conducting component 113 and the rotating shaft 13, thereby further improving the working performance of the motor 10.

[0164] In some embodiments of this application, please refer to Figures 16 to 18 together. The first retainer 111 has a plurality of first mounting slots 1115, and the heat-conducting component 113 has a plurality of second mounting slots 11323. The plurality of first mounting slots 1115 and the plurality of second mounting slots 11323 are connected in a one-to-one correspondence to form mounting cavities. The number of first magnets 112 is plurality of, and the plurality of first magnets 112 are installed in the plurality of mounting cavities in a one-to-one correspondence.

[0165] Understandably, the multiple first mounting slots 1115 of one first retainer 111 and the multiple first mounting slots 1115 of another first retainer 111 are connected one-to-one with the multiple second mounting slots 11323 of the heat-conducting element 113 along the axial direction of the rotor 11 to form multiple mounting cavities. The first magnet 112 is sequentially inserted into the first mounting slots 1115 of one first retainer 111, the second mounting slots 11323 of the heat-conducting element 113, and the first mounting slots 1115 of the other first retainer 111 along the axial direction of the rotor 11 to be installed in the mounting cavity. That is, one first retainer 111 is used to fix and support one end of the first magnet 112, and the other first retainer 111 is used to fix and support the other end of the first magnet 112. The heat generated by the first magnet 112 can be directly conducted to the heat-conducting element 113 through the middle part of the first magnet 112 along the axial direction of the rotor 11.

[0166] By adopting the above technical solution, at least part of the heat generated by the first magnet 112 can be directly conducted to the rotating shaft 13 through the heat-conducting component 113, which further improves the heat dissipation performance of the rotor 11 and thus further enhances the working performance of the motor 10.

[0167] In some embodiments of this application, please refer to Figures 7 and 9 together. The rotor 11 also includes a first magnetic plate 115 and a second magnetic plate 116. The first magnetic plate 115 and the second magnetic plate 116 are respectively disposed on opposite sides of the first magnet 112 along the axial direction of the rotor 11.

[0168] The first magnetic plate 115 and the second magnetic plate 116 are components used to guide magnetic lines of force to be transmitted in a preset direction. The materials of the first magnetic plate 115 and the second magnetic plate 116 can be, but are not limited to, iron, silicon steel, etc.

[0169] In some embodiments, a first retainer 111 is sleeved on the outer periphery of the heat-conducting member 113, a first magnet 112 is mounted on the first retainer 111, and a first magnetic plate 115 and a second magnetic plate 116 are respectively disposed on opposite sides of the first magnet 112 along the axial direction of the rotor 11.

[0170] In other embodiments, there are two first retainers 111, which are respectively disposed on opposite sides of the heat-conducting element 113 along the axial direction of the rotor 11 and cooperate to clamp the heat-conducting element 113. At least a portion of the first magnets 112 are mounted on one first retainer 111, and at least another portion of the first magnets 112 are mounted on the other first retainer 111. A first magnetic plate 115 is disposed on the side of one first retainer 111 opposite to the heat-conducting element 113, and a second magnetic plate 116 is disposed on the side of the other first retainer 111 opposite to the heat-conducting element 113.

[0171] In some embodiments, as an example, the rotor 11 further includes a sleeve 117. The first magnetic plate 115, the second magnetic plate 116, the first cage 111, and the heat-conducting element 113 can be assembled into a single unit first, and then the sleeve 117 can be fitted onto the outer periphery of this unit to securely assemble the first magnetic plate 115, the second magnetic plate 116, the first cage 111, and the heat-conducting element 113 together. The sleeve 117 can be formed from a high-strength fiber material and resin composite.

[0172] By adopting the above technical solution, the leakage flux of rotor 11 is effectively improved, the eddy current loss of rotor 11 is reduced, and the magnetic field distribution of air gap of motor 10 is optimized, thereby further improving the working performance of motor 10.

[0173] In some embodiments of this application, the first retainer 111 is directly connected to the rotating shaft 13.

[0174] The direct connection between the first retainer 111 and the rotating shaft 13 means that the first retainer 111 is in direct contact with the rotating shaft 13, and the heat generated by the first magnet 112 can be conducted to the rotating shaft 13 through the first retainer 111.

[0175] In some embodiments, referring to Figures 10 and 12 together, the first retainer 111 includes a first support ring 1111, a second support ring 1112, a plurality of first support ribs 1113, and two cover plates 1116. The second support ring 1112 is disposed in the inner ring space of the first support ring 1111 and is coaxially arranged with the first support ring 1111. The heat-conducting element 113 is disposed in the inner ring space of the second support ring 1112 and is coaxially arranged with the second support ring 1112. The plurality of first support ribs 1113 are arranged around the central axis of the rotating shaft 13 and connected between the inner peripheral wall of the first support ring 1111 and the outer peripheral wall of the second support ring 1112 to define a plurality of first mounting grooves 1115. One cover plate 1116 is placed on one side of the second support ring 1112 along the axis of the rotor 11, and another cover plate 1116 is placed on the other side of the second support ring 1112 along the axis of the rotor 11. The rotating shaft 13 passes through the two cover plates 1116 and is connected to the two cover plates 1116.

[0176] In other embodiments, there are two first retainers 111, which are respectively disposed on opposite sides of the heat-conducting element 113 along the axial direction of the rotor 11 and cooperate to clamp the heat-conducting element 113. Each first retainer 111 includes a first support ring 1111, a second support ring 1112, and a plurality of first support ribs 1113. The second support ring 1112 is disposed in the inner ring space of the first support ring 1111 and is coaxially arranged with the first support ring 1111. The plurality of first support ribs 1113 are spaced around the central axis of the rotating shaft 13 and connected between the inner peripheral wall of the first support ring 1111 and the outer peripheral wall of the second support ring 1112 to define a plurality of first mounting grooves 1115. The rotating shaft 13 passes through the second support ring 1112 and is connected to the second support ring 1112.

[0177] By adopting the above technical solution, at least a portion of the heat generated by the first magnet 112 can be conducted to the heat-conducting component 113 through the first retainer 111, and then to the rotating shaft 13 through the heat-conducting component 113. At least another portion of the heat generated by the first magnet 112 can be directly conducted to the rotating shaft 13 through the first retainer 111. That is, there are at least two heat conduction paths between the first magnet 112 and the rotating shaft 13, which further improves the heat dissipation performance of the rotor 11 and thus further enhances the working performance of the motor 10.

[0178] Secondly, please refer to Figure 4. This application provides a motor 10, including a stator 12, a rotating shaft 13 and a rotor 11 as described in any of the above embodiments. The rotor 11 is coaxially connected to the rotating shaft 13, and the stator 12 is magnetically coupled to the rotor 11 to drive the rotor 11 to rotate.

[0179] The motor 10 provided in this application embodiment effectively improves the working performance of the motor 10 by adopting the rotor 11 described in any of the above embodiments.

[0180] In some embodiments of this application, please refer to FIG5. A cooling channel 131 is formed inside the rotating shaft 13, and the cooling channel 131 is used for the flow of cooling medium.

[0181] Cooling channel 131 is used to provide a flow path for the cooling medium. Understandably, cooling channel 131 is connected to a medium supply device, and the cooling medium output by the medium supply device enters the cooling channel 131 to remove the heat from the rotating shaft 13.

[0182] In some embodiments, the cooling channel 131 extends along the axial direction of the rotating shaft 13.

[0183] In some embodiments, the cooling channel 131 extends through the opposite ends of the rotating shaft 13. One end of the rotating shaft 13 is connected to the output end of the medium supply device, and the other end of the rotating shaft 13 is connected to the return end of the medium supply device. The cooling medium enters the cooling channel 131 through one end of the rotating shaft 13 and then flows back to the medium supply device through the other end of the rotating shaft 13, so that the cooling medium circulates in the cooling channel 131.

[0184] By adopting the above technical solution, the cooling medium can carry away the heat on the rotating shaft 13 during the flow process, thereby effectively improving the heat dissipation performance of the motor 10.

[0185] Thirdly, referring to Figure 3, this application embodiment provides an electric drive device 1, including the motor 10 described above.

[0186] The electric drive device 1 provided in this application embodiment effectively improves the working performance of the electric drive device 1 by adopting the above-mentioned motor 10.

[0187] Fourthly, referring to Figure 1, this application embodiment provides an electric drive system, including a battery 2 and the aforementioned electric drive device 1, wherein the battery 2 is electrically connected to the motor 10.

[0188] The electric drive system provided in this application embodiment effectively improves the working performance of the electric drive system by adopting the above-mentioned electric drive device 1.

[0189] Fifthly, referring to Figure 1, this application embodiment provides an electric device, including the above-described electric drive device 1 or the above-described electric drive system.

[0190] The electric equipment provided in this application embodiment effectively improves the working performance of the electric equipment by adopting the above-mentioned electric drive device 1 or the above-mentioned electric drive system.

[0191] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A rotor coaxially connected to a rotation shaft, characterized in that, The rotor comprises: a first holder; a first magnet mounted on the first holder; a heat conducting member connected between the first holder and the rotating shaft.

2. The rotor of claim 1, wherein The heat conducting member is coaxially connected with the rotating shaft, and the first holder is sleeved on the outer circumferential side of the heat conducting member.

3. The rotor of claim 2, wherein The first holder comprises a first support ring and a second support ring, the first support ring is sleeved on the outer circumferential side of the second support ring and is separated from the second support ring to form a mounting space, the first magnet is mounted in the mounting space, and the heat conducting member is embedded in the inner ring space of the second support ring.

4. The rotor of claim 3, wherein The first holder further comprises a plurality of first support ribs connected between the first support ring and the second support ring, the plurality of first support ribs are arranged around the central axis of the rotor to separate the mounting space into a plurality of first mounting grooves, the number of the first magnets is a plurality, and the plurality of first magnets are correspondingly mounted in the plurality of first mounting grooves.

5. The rotor of claim 3, wherein The first holder further comprises two cover plates, the two cover plates are arranged on opposite sides of the second support ring along the axial direction of the rotor and are in thermal conductive connection with the heat conducting member.

6. The rotor of any one of claims 2-4, wherein, The rotor further comprises a second magnet mounted on the heat conducting member.

7. The rotor of claim 6, wherein The heat conducting member is provided with a plurality of second mounting grooves, the plurality of second mounting grooves are arranged around the central axis of the rotor, the number of the second magnets is a plurality, and the plurality of second magnets are correspondingly mounted in the plurality of second mounting grooves.

8. The rotor of claim 7, wherein The heat conducting member comprises a heat conducting main body and a second holder, the heat conducting main body is coaxially connected with the rotating shaft, the second holder is sleeved on the outer circumferential side of the heat conducting main body and is connected between the outer circumferential wall of the heat conducting main body and the first holder, and the plurality of second mounting grooves are provided on the second holder.

9. The rotor of claim 8, wherein The second holder comprises a third support ring and a plurality of second support ribs, the third support ring is sleeved on the outer circumferential side of the heat conducting main body, the plurality of second support ribs are arranged around the central axis of the rotor and are connected between the outer circumferential wall of the third support ring and the first holder, so as to define the plurality of second mounting grooves.

10. The rotor of claim 1, wherein The heat conducting member is coaxially connected with the rotating shaft, the number of the first holders is two, and the two first holders are arranged on opposite sides of the heat conducting member along the axial direction of the rotor and are used for clamping the heat conducting member.

11. The rotor of claim 10, wherein The first magnet is attached to the heat conducting member.

12. The rotor of claim 11, wherein The opposite end faces of the heat conducting member along the axial direction of the rotor are stepped faces, and the first holder and / or the first magnet are attached to the stepped faces.

13. The rotor of claim 12, wherein The height of the stepped face along the axial direction of the rotor gradually decreases from the middle part of the heat conducting member to the edge of the heat conducting member.

14. The rotor of claim 10, wherein The first holder is provided with a plurality of first mounting grooves, the heat conducting member is provided with a plurality of second mounting grooves, the plurality of first mounting grooves and the plurality of second mounting grooves are in one-to-one correspondence to form mounting cavities, the number of the first magnets is a plurality, and the plurality of first magnets are correspondingly mounted in the plurality of mounting cavities.

15. The rotor of any one of claims 1-14, wherein, The rotor further comprises a first magnetic conducting plate and a second magnetic conducting plate, which are arranged on opposite sides of the first magnet along the axial direction of the rotor.

16. The rotor of any one of claims 1-15, wherein, The first retainer is directly connected with the rotating shaft.

17. The rotor of any one of claims 1-16, wherein, The thermal conductivity of the heat conducting member is greater than or equal to 50 W / (m·K).

18. An electric machine characterized by The motor comprises a stator, a rotating shaft and the rotor as claimed in any one of claims 1-17, the rotor is coaxially connected with the rotating shaft, and the stator is magnetically coupled with the rotor to drive the rotor to rotate.

19. The electric machine of claim 18, wherein, The rotating shaft is internally formed with a cooling flow channel for circulating cooling medium.

20. An electric drive device characterized by comprising: The electric driving device comprises the motor as claimed in claim 18 or 19.

21. An electric drive system, characterized by The electric driving system comprises a battery and the electric driving device as claimed in claim 20, and the battery is electrically connected with the motor.

22. An electrically powered device, characterized by The electrically driven equipment comprises the electric driving device as claimed in claim 20 or the electric driving system as claimed in claim 21.

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