Rotor assembly for an axial motor, axial flux motor and vehicle

Abstract

This disclosure relates to a rotor assembly for an axial motor, an axial flux motor, and a vehicle. The rotor assembly includes a shaft, a rotor back plate, and an iron core. The shaft has a first cooling channel for supplying cooling medium. The rotor back plate has a connecting hole at its center, through which the shaft passes, and the shaft rotates coaxially with the rotor back plate. The rotor back plate has a second cooling channel for supplying cooling medium and is connected to the first cooling channel. The iron core is connected to one side of the rotor back plate. The iron core and / or the rotor back plate have a third cooling channel for supplying cooling medium, which exchanges heat with the iron core. The third cooling channel is connected to the second cooling channel. This rotor assembly can effectively dissipate heat from the iron core with a simple structure, improving the heat dissipation efficiency of the cooling medium for the axial motor rotor assembly.

Description

Technical Field

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

[0002] In related technologies, the cooling structure of the rotor assembly of the axial flux motor cannot effectively dissipate heat from the rotor core, resulting in low heat dissipation efficiency and consequently, a high temperature of the rotor assembly, which affects the performance and operational stability of the entire axial flux motor. Summary of the Invention

[0003] The purpose of this disclosure is to provide a rotor assembly for an axial motor, an axial flux motor, and a vehicle to solve the problems in the aforementioned related technologies.

[0004] To achieve the above objectives, one aspect of this disclosure provides a rotor assembly for an axial motor, comprising:

[0005] A rotating shaft is provided with a first cooling channel, which is used to supply cooling medium flow. The rotor back plate has a connecting hole at its axis, through which the rotating shaft passes and rotates coaxially with the rotor back plate. The rotor back plate is provided with a second cooling channel for supplying cooling medium flow, and the second cooling channel is connected to the first cooling channel. The iron core is connected to one side of the rotor back plate. The iron core and / or the rotor back plate are provided with a third cooling channel for the flow of cooling medium. The cooling medium can exchange heat with the iron core. The third cooling channel is connected to the second cooling channel.

[0006] In the above technical solution, the first cooling channel, the second cooling channel, and the third cooling channel are connected in sequence. As the rotor assembly rotates, centrifugal force is generated, allowing the cooling medium in the first cooling channel to flow into the second and third cooling channels. Since the third cooling channel is located on the iron core and / or the rotor back plate, the cooling medium in the third cooling channel can directly exchange heat with the iron core. Thus, effective heat dissipation of the iron core is achieved with a simple structure, enabling targeted heat dissipation of the iron core and ensuring its heat dissipation effect. This improves the heat dissipation efficiency of the cooling medium on the rotor assembly of the axial motor, reduces the operating temperature of the rotor assembly, and ensures the stability of the axial motor during operation.

[0007] In some possible implementations, at least a portion of the third cooling channel extends radially along the rotor assembly and to the outer edge of the rotor backplate, such that rotation of the rotor assembly can drive the cooling medium out through the third cooling channel.

[0008] With this configuration, the cooling medium that has exchanged heat with the iron core can be thrown out by the centrifugal force generated by the rotation of the rotor assembly. Thus, the flow of the cooling medium in the rotor assembly does not require a power source, and the thrown-out cooling medium can be collected at the bottom of the axial motor housing, and the cooling medium can be recycled.

[0009] In some possible implementations, the third cooling channel includes a first channel section and a second channel section, which are interconnected. The first channel section extends along the circumferential direction of the rotor assembly, and the second channel section extends along the radial direction of the rotor assembly. The first channel section is connected to the second cooling channel, and the cooling medium flows out from the second channel section.

[0010] This configuration allows the first flow channel to act as a diversion channel, while the cooling medium for the second flow channel can be transported through the first flow channel. This reduces the number of second cooling channels, decreases the machining steps on the rotor back plate, and lowers manufacturing costs. The cooling medium can be ejected after heat exchange with the iron core, which helps to quickly remove the heat from the iron core.

[0011] In some possible implementations, the rotor back plate includes a plate and a boss formed in the middle of one side of the plate, the iron core is connected to the plate, and the iron core is located on the side of the boss in the radial direction of the rotor assembly. Wherein, a gap is left between the inner side of the iron core in the radial direction of the rotor assembly and the side of the boss in the radial direction of the rotor assembly, and the gap is set as the first flow channel section; The iron core is configured to be multiple and interconnected in a ring shape, and is fitted onto the boss. The first flow channel segment is multiple and interconnected in a ring shape. The second flow channel segment is multiple and is distributed radially.

[0012] This design allows the cooling medium in the first flow channel section to be distributed to the second flow channel section. In addition, the cooling medium in the first flow channel section can exchange heat with the iron core, increasing the contact area between the cooling medium and the inner surface of the iron core and improving the heat dissipation effect on the iron core.

[0013] In some possible implementations, a first groove is provided on the side of the iron core facing the plate and / or on the side of the plate facing the iron core. The iron core is connected to the plate to close the opening of the first groove, so that the first groove is configured as the second flow channel segment. The first groove extends along the radial direction of the rotor assembly, and both ends of the first groove in the radial direction of the rotor assembly are configured as open ends.

[0014] This design facilitates the formation of the second flow channel section, making manufacturing easier. Additionally, it allows the cooling medium that exchanges heat with the iron core to be ejected from the first groove, enabling the collection and recycling of the cooled medium after heat exchange.

[0015] In some possible implementations, the groove wall of the first groove is configured to be straight, serpentine, or irregular.

[0016] This design increases the contact area between the cooling medium in the first groove and the iron core, thereby improving the heat exchange effect of the cooling medium.

[0017] In some possible implementations, the core is integrally formed from a soft magnetic composite material; or, the core comprises multiple silicon steel sheets stacked together.

[0018] With this configuration, the production process of the iron core can be simplified by using soft magnetic composite material integral molding, ensuring the integrity and structural strength of the iron core, reducing the weight of the rotor assembly, avoiding magnetic circuit discontinuity problems, and overcoming iron loss and eddy current loss; while the iron core composed of multiple silicon steel sheets stacked together can ensure the magnetic performance of the iron core, thereby ensuring the magnetic performance of the axial flux motor.

[0019] In some possible implementations, there are multiple iron cores, which are spliced ​​together in a ring shape, and a third cooling channel is provided between two adjacent iron cores.

[0020] With this configuration, the third cooling channel is placed between two adjacent iron cores, which can simultaneously cool the two adjacent iron cores, thereby improving the cooling efficiency of the iron cores.

[0021] In some possible implementations, the rotor back plate is provided with a first positioning part, and the iron core is provided with a second positioning part. The rotor back plate and the iron core are positioned by the cooperation of the first positioning part and the second positioning part, and the movement of the iron core relative to the rotor back plate in the radial or circumferential direction of the rotor assembly is restricted.

[0022] This configuration allows for effective positioning and stable connection between the rotor backplate and the iron core.

[0023] In some possible implementations, the rotor assembly further includes a magnet connected to the iron core, a fourth cooling channel is provided between the magnet and the iron core for the flow of a cooling medium, the cooling medium being capable of heat exchange with the magnet and the iron core, and the fourth cooling channel being connected to the third cooling channel. The fourth cooling channel extends radially along the rotor assembly and extends to the outer edge of the rotor back plate, so that the rotation of the rotor assembly can drive the cooling medium to flow out through the fourth cooling channel.

[0024] With this configuration, the cooling medium can not only cool the iron core through the third cooling channel, but also cool the magnet and iron core through the fourth cooling channel, achieving targeted heat dissipation of the magnet, thereby effectively reducing the temperature of the rotor assembly during operation and ensuring the stability of the axial motor during operation.

[0025] In some possible implementations, a second groove is provided on the side of the magnet facing the iron core and / or on the side of the iron core facing the magnet. The iron core is connected to the magnet to close the opening of the second groove, so that the second groove is configured as the fourth cooling channel. The second groove extends in the radial direction of the rotor assembly, and both ends of the second groove in the radial direction of the rotor assembly are configured as open ends.

[0026] This design facilitates the formation of the fourth cooling channel, making manufacturing easier. Additionally, it allows the cooling medium that exchanges heat with the magnet and iron core to be ejected from the second groove, enabling the collection and recycling of the cooled medium after heat exchange.

[0027] In some possible implementations, the side of the iron core facing the magnet is provided with a second groove.

[0028] The iron core has a first groove on the side facing away from the magnet. The iron core is connected to one side of the rotor back plate to close the opening of the first groove, so that the first groove is configured as at least part of the third cooling channel.

[0029] In the axial direction of the rotor assembly, the first groove and the second groove on the iron core are misaligned.

[0030] This design ensures the thickness of the iron core, thereby guaranteeing its structural strength.

[0031] In some possible implementations, the rotor back plate includes a plate and a boss formed in the middle of one side of the plate, the connecting hole penetrating the plate and the boss, the second cooling channel penetrating the boss in the radial direction of the rotor assembly, the iron core being connected to the plate, and the iron core being located on the side of the boss in the radial direction of the rotor assembly.

[0032] This design facilitates the arrangement of the second cooling channel, allows for connection between the second and third cooling channels, and avoids increasing the axial dimension.

[0033] In some possible implementations, the second cooling channel extends radially along the rotor assembly, with one end of the second cooling channel disposed on the wall of the connecting hole and the other end of the second cooling channel disposed on the side of the boss in the radial direction of the rotor assembly.

[0034] This configuration facilitates the connection between the second cooling channel and the first and third cooling channels. The centrifugal force generated by the rotating rotor back plate allows the cooling medium to be thrown out of the second cooling channel and into the third cooling channel along the extension direction of the second cooling channel. Therefore, it is not necessary to set up a drive source to drive the cooling medium to flow in the second and third cooling channels.

[0035] In some possible implementations, a cavity is provided inside the rotating shaft, and the outer peripheral wall of the rotating shaft is in contact with the wall of the connecting hole. The cavity is used for the flow of cooling medium. The rotating shaft has a through hole, the axis of which extends along the radial direction of the rotor assembly and communicates with the cavity. The cavity and the through hole cooperate to form the first cooling channel, and one end of the second cooling channel communicates with the through hole.

[0036] With this configuration, when the shaft rotates, the cooling medium inside the cavity can enter the through hole under the action of centrifugal force and be transported to the second cooling channel through the through hole.

[0037] In some possible implementations, the number of through holes is set to an even number, with each pair of through holes forming a group, and the two through holes in a group being symmetrically arranged about the axis of the rotor assembly as an axis of symmetry; The number of the second cooling channels is set to an even number, and each channel corresponds to one of the through holes.

[0038] This design prevents the cooling medium from affecting the dynamic balance of the rotor assembly after flowing into the through-hole and the second cooling channel, thus ensuring the normal operation of the rotor assembly.

[0039] In some possible implementations, the shaft has an inlet at at least one end in the axial direction of the rotor assembly, the inlet communicating with the cavity, and the inlet being used to allow the cooling medium to enter the cavity.

[0040] This design facilitates the entry of cooling medium into the cavity.

[0041] In some possible implementations, the rotor assembly further includes a magnet and a sealing cover. The magnet is connected to the side of the iron core facing away from the rotor back plate, and the sealing cover is connected to the rotor back plate. In the axial direction of the rotor assembly, the sealing cover is located on one side of the magnet, covering the magnet, and is close to the stator assembly. The sealing cover is used to restrict the flow of the cooling medium toward the stator assembly.

[0042] This configuration prevents the cooling medium from flowing towards the stator assembly and from entering the air gap between the rotor assembly and the stator assembly, thus avoiding interference with the air gap magnetic field.

[0043] In some possible implementations, the circumferential edge of the sealing cover protrudes from the magnet in the radial direction of the rotor assembly.

[0044] This design further prevents the cooling medium from flowing into the air gap between the rotor assembly and the stator assembly, thus avoiding any impact on the air gap magnetic field.

[0045] In some possible implementations, the sealing cover is provided with reinforcing ribs that extend in the radial direction of the rotor assembly.

[0046] This design improves the structural strength of the sealing cover, ensures sealing performance, and further enhances the structural strength of the rotor assembly.

[0047] In some possible implementations, the side of the magnet facing away from the iron core is provided with a receiving step, and a portion of the side of the sealing cover facing the magnet can be connected to the receiving step.

[0048] The receiving step is provided with an adhesive part, and the receiving step is bonded to a part of the sealing cover plate through the adhesive part.

[0049] This design improves the assembly efficiency of the rotor assembly, enhances the limiting effect of the sealing cover on the magnet, and avoids an increase in the axial dimension of the rotor assembly.

[0050] A second aspect of this disclosure also provides an axial flux motor, including the rotor assembly of the aforementioned axial motor.

[0051] The above technical solution can improve the heat dissipation effect of the rotor assembly, thereby ensuring the performance of the rotor assembly.

[0052] A third aspect of this disclosure also provides a vehicle that includes a rotor assembly of the aforementioned axial motor, or a vehicle that includes the aforementioned axial flux motor.

[0053] The above technical solutions can improve vehicle performance.

[0054] Other features and advantages of this disclosure will be described in detail in the following detailed description section. Attached Figure Description

[0055] The accompanying drawings are provided to further illustrate the present disclosure and form part of the specification. They are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation thereof. In the drawings: Figure 1 This is an exploded schematic diagram of a rotor assembly provided in one embodiment of the present disclosure.

[0056] Figure 2 This is a cross-sectional schematic diagram of the shaft of a rotor assembly provided in one embodiment of the present disclosure.

[0057] Figure 3 This is a schematic diagram of the rotor back plate of a rotor assembly provided in one embodiment of the present disclosure.

[0058] Figure 4 This is a cross-sectional schematic diagram of a rotor assembly provided in one embodiment of the present disclosure at a first angle.

[0059] Figure 5 This is a cross-sectional schematic diagram of a rotor assembly provided in one embodiment of the present disclosure at a second angle.

[0060] Figure 6 This is a schematic diagram of the iron core according to the first embodiment of this disclosure.

[0061] Figure 7 This is a schematic diagram of the iron core according to the second embodiment of this disclosure.

[0062] Figure 8 This is a structural diagram of a magnet provided in one embodiment of the present disclosure.

[0063] Explanation of reference numerals in the attached figures 1. Rotating shaft; 11. First cooling channel; 12. Cavity; 13. Through hole; 2. Rotor back plate; 21. Connecting hole; 22. Second cooling channel; 23. Plate; 24. Boss; 3. Iron core; 31. Third cooling channel; 311. First channel section; 312. Second channel section; 4. First groove; 5. Magnet; 51. Fourth cooling channel; 52. Receiving step; 6. Second groove; 7. Sealing cover plate. Detailed Implementation

[0064] The specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0065] In this disclosure, unless otherwise stated, "inner" and "outer" refer to the inner and outer parts of the relevant components. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0066] In the description of this disclosure, it should also be noted that, unless otherwise expressly specified and limited, the terms "setup" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can be a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0067] An axial flux motor is a type of motor in which the main magnetic field is along the axis of rotation. It features high torque, high efficiency, and a compact structure, and offers higher power and torque density compared to radial flux motors. Heat dissipation is particularly important for axial flux motors, as it significantly impacts their performance.

[0068] In related technologies, the cooling structure of the rotor assembly of the axial flux motor cannot effectively dissipate heat from the rotor core, resulting in low heat dissipation efficiency and consequently, a high temperature of the rotor assembly, which affects the performance and operational stability of the entire axial flux motor.

[0069] The rotor assembly of the axial motor in the exemplary embodiments of this disclosure will now be described with reference to the accompanying drawings.

[0070] refer to Figures 1 to 8 As shown, one aspect of this disclosure provides a rotor assembly for an axial motor, including a shaft 1, a rotor back plate 2, and an iron core 3.

[0071] The rotor shaft 1 is provided with a first cooling channel 11 for the flow of cooling medium. The rotor back plate 2 has a connecting hole 21 at its axis, through which the rotor shaft 1 passes. The rotor shaft 1 rotates coaxially with the rotor back plate 2. The rotor back plate 2 is provided with a second cooling channel 22 for the flow of cooling medium, and the second cooling channel 22 is connected to the first cooling channel 11. The iron core 3 is connected to one side of the rotor back plate 2. The iron core 3 and / or the rotor back plate 2 are provided with a third cooling channel 31 for the flow of cooling medium, which can exchange heat with the iron core 3. The third cooling channel 31 is connected to the second cooling channel 22.

[0072] In the above technical solution, after the rotating shaft 1 is connected to the rotor back plate 2 through the connecting hole 21, the second cooling channel 22 on the rotor back plate 2 and the first cooling channel 11 on the rotating shaft 1 can be interconnected. An iron core 3 is provided on one side of the rotor back plate 2. It can be understood that the third cooling channel 31 can be directly provided on the iron core 3 so that the cooling medium in the third cooling channel 31 can exchange heat with the iron core 3. Alternatively, the third cooling channel 31 can be provided on the rotor back plate 2 so that the cooling medium in the third cooling channel 31 can exchange heat with the iron core 3. Alternatively, the third cooling channel 31 can be simultaneously disposed on the rotor back plate 2 and the iron core 3 to increase the area where the third cooling channel 31 can exchange heat with the iron core 3, thereby ensuring the cooling effect of the third cooling channel 31 on the iron core 3. Thus, when the axial motor is working, the centrifugal force generated when the rotor assembly rotates will cause the cooling medium in the shaft 1 to first enter the second cooling channel 22 of the rotor back plate 2 through the first cooling channel 11, and then enter the third cooling channel 31, thereby achieving heat dissipation of the iron core 3.

[0073] The rotating shaft 1 can be press-fitted with the connecting hole 21, or it can be keyed or fitted.

[0074] The rotor assembly is provided with a first cooling channel 11, a second cooling channel 22, and a third cooling channel 31 that are connected and used for the flow of cooling medium. The cooling medium in the third cooling channel 31 can directly exchange heat with the iron core 3. Based on this, the rotor assembly of this disclosure can effectively dissipate heat from the iron core 3 with a simple structure. It can specifically dissipate heat from the iron core 3, ensure the heat dissipation effect of the iron core 3, thereby improving the heat dissipation efficiency of the cooling medium on the rotor assembly of the axial motor, reducing the operating temperature of the rotor assembly, and ensuring the stability of the axial motor during operation.

[0075] It is understandable that, in order to facilitate the flow of the cooling medium between the first cooling channel 11, the second cooling channel 22 and the third cooling channel 31, at least a portion of the channel sections of the first cooling channel 11, the second cooling channel 22 and the third cooling channel 31 can extend radially in the axial direction of the motor; in order to facilitate the connection between the rotor back plate 2 and the iron core 3, the side of the iron core 3 connected to the rotor back plate 2 can be the side of the rotor back plate 2 in the axial direction of the axial motor.

[0076] In addition, the cooling medium mentioned above can be configured as cooling oil or coolant.

[0077] Alternatively, one embodiment of this disclosure, such as Figure 4 and Figure 5As shown, at least a portion of the third cooling channel 31 extends in the radial direction of the rotor assembly and extends to the outer edge of the rotor back plate 2, so that the rotation of the rotor assembly can drive the cooling medium to flow out through the third cooling channel 31.

[0078] Understandably, when shaft 1 rotates, the resulting centrifugal force causes the cooling medium to be thrown radially outward along the third cooling channel 31 from the outer periphery of the rotor assembly. This removes heat from the core 3 from the rotor assembly, ensuring its normal operation. Thus, the cooling medium, after heat exchange with the core 3, can be thrown out by the centrifugal force generated by the rotor assembly's rotation, eliminating the need for a power source for the flow of cooling medium within the rotor assembly. Furthermore, the thrown-out cooling medium can collect at the bottom of the axial motor housing and flow back to the oil cooler for further cooling, achieving the recycling of the cooling medium.

[0079] Alternatively, one embodiment of this disclosure, such as Figures 4 to 7 As shown, the third cooling channel 31 may include a first channel section 311 and a second channel section 312. The first channel section 311 and the second channel section 312 are interconnected. The first channel section 311 extends along the circumferential direction of the rotor assembly, and the second channel section 312 extends along the radial direction of the rotor assembly. The first channel section 311 is connected to the second cooling channel 22, and the cooling medium flows out from the second channel section 312.

[0080] In this system, the cooling medium flowing out of the second cooling channel 22 enters the first channel section 311 and flows circumferentially along the rotor assembly. This allows the first channel section 311 to act as a flow divider, enabling the cooling medium in the second channel section 312 to be transported through the first channel section 311. This reduces the number of second cooling channels 22 required, decreases the number of machining steps on the rotor back plate 2, and lowers manufacturing costs. Furthermore, the cooling medium in the first channel section 311 can cool a portion of the core 3. Subsequently, the cooling medium in the first channel section 311 can enter the second channel section 312 and flow radially along the rotor assembly to cool another portion of the core 3. Thus, the first channel section 311 and the second channel section 312 can contact different surfaces of the core 3 for heat exchange, increasing the contact area between the cooling medium and the core 3 to a certain extent and improving the heat dissipation effect of the cooling medium on the core 3.

[0081] In addition, the second flow channel section 312 can also allow the cooling medium to be thrown out of the rotor assembly under the action of centrifugal force, so that the cooling medium can be thrown out after heat exchange with the iron core 3, which is conducive to quickly removing the heat of the iron core 3 and also facilitates the subsequent recycling of the cooling medium.

[0082] Alternatively, one embodiment of this disclosure, such as Figure 1 and Figure 3As shown, the rotor back plate 2 may include a plate 23 and a boss 24 formed in the middle of one side of the plate 23. The iron core 3 is connected to the plate 23 and is located on the side of the boss 24 in the radial direction of the rotor assembly. There is a gap between the inner side of the iron core 3 in the radial direction of the rotor assembly and the side of the boss 24 in the radial direction of the rotor assembly. The gap is set as a first flow channel section 311.

[0083] Optionally, in some examples, the number of iron cores 3 is set to be multiple and interconnected in a ring shape, and fitted onto the boss 24. The number of first flow channel sections 311 is multiple and interconnected in a ring shape, and the number of second flow channel sections 312 is multiple and distributed radially. Optionally, in other examples, the iron core 3 may be ring-shaped and fitted onto the boss 24, so that the first flow channel sections 311 are ring-shaped. The number of second flow channel sections 312 is multiple and distributed radially.

[0084] It is understandable that after the cooling medium flows out from the second cooling channel 22, it can first flow between the boss 24 and the inner side of the iron core 3, thereby realizing the distribution of the cooling medium. The annular first channel section 311 can distribute the cooling medium to multiple second channel sections 312.

[0085] In some examples, the number of iron cores 3 is set to be multiple and connected to each other in a ring shape, so that there are multiple first flow channel sections 311 between the iron cores 3 and the bosses 24, which can be spliced ​​to form a ring. And each iron core 3 can be provided with a second flow channel section 312 between it and the plate 23.

[0086] In addition, the cooling medium in the first flow channel section 311 can dissipate heat to the inner surface of the iron core 3. This increases the contact area between the cooling medium and the inner surface of the iron core 3, thereby improving the heat dissipation effect on the iron core 3.

[0087] The boss 24 can extend axially in the rotor assembly. The boss 24 is located in the middle of one side of the plate 23. In the radial direction of the rotor assembly, at least a portion of the outer side of the boss 24 and the inner side of the core 3 can form the wall of the first flow channel section 311, thereby ensuring the stability of the cooling medium when it flows in the first flow channel section 311, facilitating the distribution of the cooling medium, and also allowing the cooling medium to fully contact the inner side of the core 3, increasing the contact area between the cooling medium and the inner side of the core 3, and improving the heat dissipation effect on the core 3.

[0088] For example, the boss 24 is constructed as an annular boss. A recessed portion is formed on the outer circumferential surface of the boss 24, recessed towards the central axis of the rotor assembly, which can be used to mate with the iron core 3. After the iron core 3 is disposed on the side of the boss 24, the inner surface of the iron core 3 can close the opening of the recessed portion in the radial direction of the rotor assembly, so that a first flow channel section 311 for the flow of cooling medium can be formed between the recessed portion and the inner surface of the iron core 3. A protrusion protruding along the axial direction of the rotor assembly can be formed on the end face of the boss 24 in the axial direction of the rotor assembly, and the protrusion can mate with the rotating shaft 1.

[0089] Alternatively, one embodiment of this disclosure, such as Figure 6 and Figure 7 As shown, a first groove 4 is provided on the side of the iron core 3 facing the plate 23 and / or the side of the plate 23 facing the iron core 3. The iron core 3 is connected to the plate 23 to close the opening of the first groove 4, so that the first groove 4 is set as the second flow channel section 312. The first groove 4 extends along the radial direction of the rotor assembly, and the two ends of the first groove 4 in the radial direction of the rotor assembly are set as open ends.

[0090] Among them, the side of the iron core 3 facing the plate 23 can be the first side, the end of the first groove 4 near the first flow channel section 311 can be the first end, and the end of the first groove 4 away from the first flow channel section 311 can be the second end. Both the first end and the second end are set as open ends.

[0091] In some examples, the first groove 4 can be disposed on the first surface. In this case, the side of the plate 23 facing the iron core 3 can be used to close the slot of the first groove 4 in the axial direction of the rotor assembly. Thus, the first groove 4 and the side of the plate 23 facing the iron core 3 can jointly form a second flow channel section 312 for the flow of cooling medium. This allows the cooling medium in the first flow channel section 311 to enter the first groove 4 through the first end and flow towards the second end along the extension direction of the first groove 4 under the action of centrifugal force until it is thrown out from the second end of the first groove 4. During this process, the cooling medium can contact the groove wall of the first groove 4, thereby realizing heat exchange between the cooling medium and the iron core 3.

[0092] In other examples, the first groove 4 can be provided on the side of the plate 23 facing the iron core 3. In this case, the first surface of the iron core 3 can be used to close the slot of the first groove 4 in the axial direction of the rotor assembly. In this way, the first groove 4 and the first surface of the iron core 3 can jointly form a second flow channel section 312 for the flow of cooling medium. When the cooling medium flows in the first groove 4, the cooling medium can come into contact with the first surface of the iron core 3, thereby realizing heat exchange between the cooling medium and the iron core 3.

[0093] In other examples, the first groove 4 can be provided on both the first surface and the side of the plate 23 facing the iron core 3. This increases the area of ​​the first groove 4, thereby increasing the contact area between the cooling medium and the iron core 3 and improving the heat dissipation efficiency of the cooling medium for the iron core 3.

[0094] Furthermore, the number of first grooves 4 provided on the plate 23 and / or the iron core 3 can be multiple, which can further increase the contact area between the cooling medium and the iron core 3, thereby further improving the heat exchange efficiency of the cooling medium for the iron core 3. That is to say, the number of second flow channel sections 312 between each iron core 3 and the plate 23 can be multiple.

[0095] Furthermore, the first ends of the plurality of first grooves 4 can all be connected to the annular first flow channel section 311. Therefore, different numbers of first grooves 4 can be provided as needed without changing the structure of the first flow channel section 311, simplifying the structure of the third cooling flow channel 31 and reducing the cost of the rotor assembly. Moreover, the first grooves 4 extend radially along the rotor assembly, which also facilitates the ejection of the cooling medium from the first grooves 4, thereby enabling the collection and recycling of the cooled medium after heat exchange.

[0096] Alternatively, one embodiment of this disclosure, such as Figure 6 and Figure 7 As shown, the groove wall of the first groove 4 is configured as a straight, serpentine, or irregular shape. Therefore, different designs of the groove wall of the first groove 4 can increase the contact area between the cooling medium in the first groove 4 and the iron core 3 as needed, thereby improving the heat exchange effect of the cooling medium.

[0097] The straight wall of the first groove 4 facilitates the flow of the cooling medium and improves its efficiency. Conversely, a serpentine or irregular shape on the wall of the first groove 4 increases the contact area between the cooling medium and the iron core 3, thus improving the heat exchange effect of the cooling medium.

[0098] Alternatively, in another embodiment of this disclosure (not shown), the rotor back plate 2 may include a plate body 23, on the surface of the plate body 23, a second cooling channel 22 is formed, the second cooling channel 22 is located near the connection hole 21 of the plate body 23, so as to communicate with the first cooling channel 11.

[0099] Optionally, in one embodiment of this disclosure, the iron core 3 can be integrally molded from a soft magnetic composite material. This simplifies the production process of the iron core 3 and ensures its integrity and structural strength. Furthermore, the soft magnetic composite material has a lower density, and integral molding of the iron core 3 from this material can reduce the weight of the rotor assembly, thereby reducing the overall weight of the axial flux motor, avoiding magnetic circuit discontinuity problems, and overcoming iron loss and eddy current loss.

[0100] In some examples, the core 3 comprises multiple silicon steel sheets stacked together. This ensures the magnetic properties of the core 3, thereby guaranteeing the magnetic properties of the axial flux motor.

[0101] Optionally, in one embodiment of this disclosure, there can be multiple iron cores 3, which are spliced ​​together in a ring shape, with a third cooling channel 31 provided between two adjacent iron cores 3. It is understood that the third cooling channel 31 can also be located between two adjacent iron cores 3 along the circumference of the rotor assembly; that is, the third cooling channel 31 can be located at the splice point of two adjacent iron cores 3 to simultaneously cool the two adjacent iron cores 3, thereby improving the cooling efficiency of the iron cores 3.

[0102] For example, two adjacent iron cores 3 can be iron core a and iron core b, wherein the side of iron core a used to splice with iron core b can be a first splicing surface, and the side of iron core b used to splice with iron core a can be a second splicing surface, and a third cooling channel 31 can be provided on at least one of the first splicing surface and the second splicing surface.

[0103] For example, when a third groove is provided on the first splicing surface, the second splicing surface of iron core b and the first splicing surface of iron core a are connected to close the opening of the third groove, so as to form a third cooling channel 31 on iron core a. In this way, when the cooling medium flows in the third groove, it can cool iron core a and iron core b at the same time.

[0104] Alternatively, when a third groove is provided on the second splicing surface, the first splicing surface of iron core a and the second splicing surface of iron core b are connected to close the opening of the third groove, so as to form a third cooling channel 31 on iron core b. In this way, when the cooling medium flows in the third groove, it can cool iron core a and iron core b at the same time.

[0105] In some examples, when a third groove is provided on both the first splicing surface and the second splicing surface, the third groove on the first splicing surface and the third groove on the second splicing surface can be arranged opposite to each other to form a third cooling channel 31; or, the third groove on the first splicing surface and the third groove on the second splicing surface can be staggered to form a third cooling channel 31 respectively, thereby improving the cooling effect on the iron core 3.

[0106] In addition, the third cooling channel 31 can be arranged on the end face of the iron core 3 in the axial direction of the rotor assembly and at the connection of two adjacent iron cores 3, thereby increasing the coverage area of ​​the third cooling channel 31 and improving the cooling effect on the iron core 3.

[0107] Optionally, in one embodiment of this disclosure, the rotor back plate 2 may be provided with a first positioning part, and the iron core 3 may be provided with a second positioning part. The rotor back plate 2 and the iron core 3 are positioned by the cooperation of the first positioning part and the second positioning part, and the movement of the iron core 3 relative to the rotor back plate 2 in the radial or circumferential direction of the rotor assembly is restricted.

[0108] It is understandable that the first positioning part and the second positioning part can realize the effective positioning and stable connection between the rotor back plate 2 and the iron core 3, thereby ensuring that the first cooling channel 11, the second cooling channel 22 and the third cooling channel 31 can be accurately connected, which is conducive to the flow of the cooling medium in the rotor assembly.

[0109] For example, one of the first positioning part and the second positioning part can be a protruding structure and the other can be a groove structure. The protruding structure and the groove structure can be connected by snap-fit ​​to achieve precise positioning between the rotor back plate 2 and the iron core 3 and restrict the relative movement between them. Subsequently, they can be connected by means of adhesive bonding, thereby achieving the positioning connection between the rotor back plate 2 and the iron core 3.

[0110] Alternatively, one embodiment of this disclosure, such as Figure 1 , Figure 4 , Figures 6 to 8 As shown, the rotor assembly may further include a magnet 5, which is connected to the side of the iron core 3 facing away from the rotor back plate 2. A fourth cooling channel 51 is provided between the magnet 5 and the iron core 3. The fourth cooling channel 51 is used for the flow of cooling medium, which exchanges heat with the magnet 5 and the iron core 3. The fourth cooling channel 51 is connected to the third cooling channel 31. The cooling medium entering the third cooling channel 31 can also enter the fourth cooling channel 51 to exchange heat with the magnet 5 and the iron core 3, thereby cooling the magnet 5. In other words, in addition to cooling the iron core 3 through the third cooling channel 31, the cooling medium can also cool the magnet 5 and the iron core 3 through the fourth cooling channel 51, thereby effectively reducing the temperature of the rotor assembly during operation and ensuring the stability of the axial motor during operation.

[0111] The fourth cooling channel 51 extends radially along the rotor assembly and reaches the outer edge of the rotor back plate 2, so that the rotation of the rotor assembly can drive the cooling medium to flow out through the fourth cooling channel 51. As a result, the cooled medium after heat exchange will be thrown out from the fourth cooling channel 51 under the action of centrifugal force, which can quickly remove the heat and facilitate the subsequent recycling of the cooling medium.

[0112] The fourth cooling channel 51 can be connected to the first channel section 311 of the third cooling channel 31. In this way, the cooling medium can also flow into the fourth cooling channel 51 during the process of flowing from the first channel section 311 to the second channel section 312, thereby achieving simultaneous cooling of the iron core 3 and the magnet 5.

[0113] Alternatively, one embodiment of this disclosure, such as Figure 1 , Figure 4 , Figures 6 to 8 As shown, a second groove 6 is provided on the side of the magnet 5 facing the iron core 3 and / or the side of the iron core 3 facing the magnet 5. The iron core 3 is connected to the magnet 5 to close the opening of the second groove 6, so that the second groove 6 is configured as a fourth cooling channel 51. The second groove 6 extends along the radial direction of the rotor assembly, and the two ends of the second groove 6 in the radial direction of the rotor assembly are set as open ends.

[0114] A second groove 6 is provided on the magnet 5 and / or the iron core 3, so that the cooling medium flowing in the second groove 6 can dissipate heat on both the magnet 5 and the iron core 3 at the same time, thereby improving the heat dissipation efficiency of the cooling medium. The side of the iron core 3 facing away from the plate 23 can be the second side.

[0115] In some examples, the second groove 6 can be located on the side of the magnet 5 facing the iron core 3. In this case, the second surface of the iron core 3 can be used to close the slot of the second groove 6 in the axial direction of the rotor assembly. Thus, the second groove 6 and the second surface of the iron core 3 can jointly form a fourth cooling channel 51 for the flow of cooling medium, so that the cooling medium in the third cooling channel 31 can enter the second groove 6 and flow along the extension direction of the second groove 6 under the action of centrifugal force until it is thrown out from the second groove 6. During this process, the cooling medium can simultaneously contact the groove wall of the second groove 6 and the second surface of the iron core 3, thereby realizing the heat dissipation of the cooling medium on the iron core 3 and the magnet 5.

[0116] In other examples, the second groove 6 can be disposed on the second surface of the iron core 3. In this case, the side of the magnet 5 facing the second surface can be used to close the slot of the second groove 6 in the axial direction of the rotor assembly. Thus, the second groove 6 and the side of the magnet 5 facing the iron core 3 can jointly form a fourth cooling channel 51 for the flow of cooling medium, so that the cooling medium in the third cooling channel 31 can enter the second groove 6 and flow along the extension direction of the second groove 6 under the action of centrifugal force until it is thrown out from the second groove 6. During this process, the cooling medium can simultaneously contact the groove wall of the second groove 6 and the side of the magnet 5 facing the iron core 3, thereby realizing the heat dissipation of the cooling medium on the iron core 3 and the magnet 5.

[0117] In other examples, the second groove 6 can be provided on both the side of the magnet 5 facing the second surface and the second surface of the iron core 3. This increases the area of ​​the second groove 6, thereby increasing the contact area between the cooling medium and the iron core 3 and the magnet 5, and improving the heat dissipation effect of the cooling medium on the iron core 3 and the magnet 5.

[0118] Optionally, in one embodiment of this disclosure, a second groove 6 is provided on the side of the iron core 3 facing the magnet 5; a first groove 4 is provided on the side of the iron core 3 away from the magnet 5, and the side of the iron core 3 is connected to the rotor back plate 2 to close the opening of the first groove 4, so that the first groove 4 is configured as at least part of the third cooling channel 31; wherein, in the axial direction of the rotor assembly, the first groove 4 and the second groove 6 on the iron core 3 are misaligned.

[0119] In other words, a first groove 4 is provided on the first surface of the iron core 3, which can form at least part of the third cooling channel 31, and a second groove 6 is provided on the second surface of the iron core 3, which can form at least part of the fourth cooling channel 51. Thus, while ensuring that the cooling medium can dissipate heat to the iron core 3 and the magnet 5, the heat dissipation effect of the cooling medium on the iron core 3 is improved. It can be understood that in order to ensure the structural strength of the iron core 3, the first groove 4 and the second groove 6 on the iron core 3 are staggered in the axial direction of the rotor assembly, which can ensure the thickness of the iron core 3 and avoid the local thickness of the iron core 3 being too small.

[0120] In addition, the second groove 6 can be constructed as a square groove, a wedge-shaped groove, or a dovetail-shaped groove, etc.

[0121] Furthermore, there can be multiple second grooves 6 provided on the magnet 5 and / or the iron core 3. The number of second grooves 6 increases the contact area between the cooling medium and the magnet 5 and the iron core 3, thereby further improving the heat dissipation effect on the magnet 5 and the iron core 3. Moreover, the second grooves 6 extend radially along the rotor assembly, which also facilitates the dissipation of the cooling medium in the fourth cooling channel 51 from the second grooves 6, thus achieving the collection and recycling of the cooled medium after heat exchange.

[0122] The number of magnets 5 is multiple, and they can correspond one-to-one with the iron cores 3. That is to say, there can be multiple second grooves 6 between each iron core 3 and each magnet 5. The magnets 5 can be made of magnetic steel.

[0123] Alternatively, in another embodiment of this disclosure (not shown), the rotor assembly may further include a magnet 5, which is arranged side by side with the iron core 3 in the circumferential or radial direction of the rotor assembly. A fourth cooling channel 51 is provided between the magnet 5 and the iron core 3. The fourth cooling channel 51 is used for the flow of cooling medium, and the cooling medium exchanges heat with the magnet 5 and the iron core 3. The fourth cooling channel 51 is connected to the third cooling channel 31.

[0124] Alternatively, one embodiment of this disclosure, such as Figure 1 , Figure 3 as well as Figure 4 As shown, the rotor back plate 2 may include a plate 23 and a boss 24 formed in the middle of one side of the plate 23. A connecting hole 21 penetrates the plate 23 and the boss 24. A second cooling channel 22 penetrates the boss 24 in the radial direction of the rotor assembly. An iron core 3 is connected to the plate 23. In the radial direction of the rotor assembly, the iron core 3 is located on the side of the boss 24.

[0125] The boss 24 can extend axially in the rotor assembly and be arranged around the outer periphery of the connecting hole 21. In this way, when the rotating shaft 1 is connected to the rotor back plate 2 through the connecting hole 21, the contact area between the rotating shaft 1 and the rotor back plate 2 can be increased, thereby ensuring the stability of the rotating shaft 1 after it is connected to the rotor back plate 2.

[0126] In addition, the boss 24 can provide sufficient space for the second cooling channel 22, which is conducive to the formation of the second cooling channel 22, so that the second cooling channel 22 can be connected with the first cooling channel 11 on the rotating shaft 1, and also facilitates the connection between the second cooling channel 22 and the third cooling channel 31, while avoiding the increase of the axis dimension.

[0127] The shaft 1 and the connecting hole 21 of the rotor back plate 2 can be connected by an interference fit to ensure the stability of the connection. In addition, the shaft 1 and the connecting hole 21 can be sealed to ensure a sealed connection between the first cooling channel 11 and the second cooling channel 22, preventing the cooling medium from leaking from the connection between the first cooling channel 11 and the second cooling channel 22.

[0128] Optionally, in one embodiment of this disclosure, the second cooling channel 22 may extend radially along the rotor assembly. One end of the second cooling channel 22 is disposed on the wall of the connecting hole 21, and the other end of the second cooling channel 22 is disposed on the side of the boss 24 in the radial direction of the rotor assembly. This facilitates communication between the second cooling channel 22 and the first cooling channel 11 and the third cooling channel 31.

[0129] In this way, when the rotor assembly is working, the centrifugal force generated by the rotating rotor back plate 2 can cause the cooling medium to be thrown out of the second cooling channel 22 along the extension direction of the second cooling channel 22. That is, it is beneficial for the cooling medium to be thrown out from the side of the boss 24 in the radial direction of the rotor assembly, and then enter the third cooling channel 31. This ensures the flow efficiency of the cooling medium in the second cooling channel 22, and it is not necessary to set up a drive source to drive the cooling medium to flow in the second cooling channel 22 and the third cooling channel 31.

[0130] Alternatively, one embodiment of this disclosure, such as Figure 2As shown, a cavity 12 can be provided inside the rotating shaft 1, and the outer peripheral wall of the rotating shaft 1 is in contact with the wall of the connecting hole 21. The cavity 12 is used for the flow of cooling medium. The rotating shaft 1 has a through hole 13, the axis of which extends along the radial direction of the rotor assembly and communicates with the cavity 12. The cavity 12 and the through hole 13 cooperate to form a first cooling channel 11, and one end of the second cooling channel 22 communicates with the through hole 13. Thus, the cavity 12 can temporarily store the cooling medium to ensure the supply of cooling medium.

[0131] When the rotor assembly is working, the centrifugal force generated by the rotating shaft 1 during rotation will cause the cooling medium in the cavity 12 to be thrown to the through hole 13 and enter the second cooling channel 22 through the through hole 13, thereby ensuring the flow efficiency of the cooling medium in the first cooling channel 11.

[0132] The number of through holes 13 can be adjusted adaptively according to requirements.

[0133] In addition, the contact between the outer peripheral wall of the rotating shaft 1 and the wall of the connecting hole 21 can improve the stability of the connection between the rotating shaft 1 and the connecting hole 21 by means of, for example, interference fit.

[0134] Alternatively, one embodiment of this disclosure, such as Figure 2 As shown, the number of through holes 13 is set to an even number, with every two through holes 13 forming a group. The two through holes 13 in a group are symmetrically arranged with the axis of the rotor assembly as the axis of symmetry. The number of second cooling channels 22 is also set to an even number, and they correspond one-to-one with the through holes 13.

[0135] It is understandable that the through-holes 13 and the second cooling channel 22 are symmetrically arranged about the axis of the rotor assembly. This avoids the cooling medium from affecting the dynamic balance of the rotor assembly after flowing into the through-holes 13 and the second cooling channel 22, thus ensuring the normal operation of the rotor assembly. It should be noted that the specific number of through-holes 13 can be adjusted adaptively according to requirements, and no further restrictions are imposed here.

[0136] Optionally, in one embodiment of this disclosure, the rotating shaft 1 may have an inlet at at least one end in the axial direction of the rotor assembly, the inlet being connected to the cavity 12, and the inlet being used to allow cooling medium to enter the cavity 12.

[0137] The inlet configuration facilitates the entry of cooling medium into cavity 12. The cooling medium can enter cavity 12 of shaft 1 in various ways. For example, the cooling medium can be sprayed into cavity 12 through oil pipe or directly introduced into cavity 12 through pipeline.

[0138] Alternatively, one embodiment of this disclosure, such as Figure 1As shown, the rotor assembly also includes a magnet 5 and a sealing cover 7. The magnet 5 is connected to the side of the iron core 3 away from the rotor back plate 2. The sealing cover 7 is connected to the rotor back plate 2. In the axial direction of the rotor assembly, the sealing cover 7 is located on one side of the magnet 5. The sealing cover 7 covers the magnet 5 and is close to the stator assembly. The sealing cover 7 is used to restrict the flow of the cooling medium toward the stator assembly.

[0139] The iron core 3 is connected to the plate 23 of the rotor back plate 2 on one side, and to the magnet 5 on the other side. Multiple magnets 5 can be arranged at intervals around the circumference of the iron core 3. Since the rotor assembly and stator assembly are arranged adjacent to each other on the rotor assembly axis, and there is an air gap between them, the air gap magnetic field is crucial for the axial motor. Therefore, after the sealing cover 7 is connected to the rotor back plate 2, the sealing cover 7 can prevent the cooling medium of the rotor assembly from flowing towards the stator assembly, and prevent the cooling medium from entering the air gap between the rotor assembly and the stator assembly, thus affecting the air gap magnetic field. The sealing cover 7 and the rotor back plate 2 can be connected by fasteners such as bolts or screws. Thus, the sealing cover 7 can constrain the magnet 5 in the axial direction of the rotor assembly, limiting the movement of the magnet 5 in that direction.

[0140] Optionally, in one embodiment of this disclosure, the circumferential edge of the sealing cover 7 protrudes beyond the magnet 5 in the radial direction of the rotor assembly. That is, the outer diameter of the sealing cover 7 is larger than the outer diameters of the magnet 5 and the iron core 3. This further prevents the cooling medium from flowing into the air gap between the rotor assembly and the stator assembly, avoiding affecting the air gap magnetic field and thus avoiding affecting the performance of the motor.

[0141] Optionally, in one embodiment of this disclosure, the sealing cover 7 may be provided with reinforcing ribs extending radially along the rotor assembly. The addition of reinforcing ribs can improve the structural strength of the sealing cover 7, thereby further improving the structural strength of the rotor assembly. The sealing cover 7 may be made of a non-magnetic, non-conductive non-metallic composite material. In some examples, the sealing cover 7 may be an annular plate, with one end of the reinforcing rib extending to the inner annular wall of the sealing cover 7 and the other end extending to the outer annular wall of the sealing cover 7, thereby improving overall rigidity.

[0142] Optionally, in one embodiment of this disclosure, a receiving step 52 is provided on the side of the magnet 5 facing away from the iron core 3. A portion of the side of the sealing cover 7 covering the magnet 5 can connect with the receiving step 52. The receiving step 52 facilitates the positioning connection between the sealing cover 7 and the magnet 5, thereby improving the assembly efficiency of the rotor assembly and enhancing the limiting effect of the sealing cover 7 on the magnet 5. In addition, this arrangement can also avoid increasing the axial dimension of the rotor assembly, thereby saving the space occupied by the rotor assembly in the axial direction.

[0143] In some examples, the receiving step 52 may be provided with an adhesive portion, through which the receiving step 52 can be bonded to a portion of the sealing cover plate 7. The adhesive connection between the receiving step 52 and the sealing cover plate 7 further improves the connection stability between them. Furthermore, it eliminates the need for other connecting components and structures, simplifying the structure of the sealing cover plate 7 and the magnet 5. A second aspect of this disclosure also provides an axial flux motor, including the rotor assembly of the aforementioned axial motor.

[0144] A third aspect of this disclosure also provides a vehicle that includes a rotor assembly of the aforementioned axial motor, or a vehicle that includes the aforementioned axial flux motor.

[0145] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this disclosure.

[0146] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0147] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. A rotor assembly for an axial motor, characterized in that, include: A rotating shaft is provided with a first cooling channel, which is used to supply cooling medium flow. The rotor back plate has a connecting hole at its axis, through which the rotating shaft passes and rotates coaxially with the rotor back plate. The rotor back plate is provided with a second cooling channel for supplying cooling medium flow, and the second cooling channel is connected to the first cooling channel. The iron core is connected to one side of the rotor back plate. The iron core and / or the rotor back plate are provided with a third cooling channel for the flow of cooling medium. The cooling medium can exchange heat with the iron core. The third cooling channel is connected to the second cooling channel.

2. The rotor assembly of the axial motor according to claim 1, characterized in that, At least a portion of the third cooling channel extends radially along the rotor assembly and to the outer edge of the rotor back plate, such that rotation of the rotor assembly can drive the cooling medium to flow out through the third cooling channel.

3. The rotor assembly of the axial motor according to claim 2, characterized in that, The third cooling channel includes a first channel section and a second channel section, which are interconnected. The first channel section extends along the circumferential direction of the rotor assembly, and the second channel section extends along the radial direction of the rotor assembly. The first channel section is connected to the second cooling channel, and the cooling medium flows out from the second channel section.

4. The rotor assembly of the axial motor according to claim 3, characterized in that, The rotor back plate includes a plate and a boss formed in the middle of one side of the plate. The iron core is connected to the plate and the iron core is located on the side of the boss in the radial direction of the rotor assembly. Wherein, a gap is left between the inner side of the iron core in the radial direction of the rotor assembly and the side of the boss in the radial direction of the rotor assembly, and the gap is set as the first flow channel section; The iron core is configured to be multiple and interconnected in a ring shape, and is fitted onto the boss. The first flow channel segment is multiple and interconnected in a ring shape. The second flow channel segment is multiple and is distributed radially.

5. The rotor assembly of the axial motor according to claim 4, characterized in that, The iron core is provided with a first groove on the side facing the plate and / or the side facing the iron core. The iron core is connected to the plate to close the opening of the first groove, so that the first groove is set as the second flow channel section. The first groove extends along the radial direction of the rotor assembly, and the two ends of the first groove in the radial direction of the rotor assembly are set as open ends.

6. The rotor assembly of the axial motor according to claim 5, characterized in that, The groove wall of the first groove is configured to be straight, serpentine, or irregular.

7. The rotor assembly of the axial motor according to claim 1, characterized in that, The iron core is integrally molded from a soft magnetic composite material; or... The iron core comprises multiple silicon steel sheets, which are stacked together.

8. The rotor assembly of the axial motor according to claim 1, characterized in that, The number of iron cores is multiple, and the multiple iron cores are spliced ​​together to form a ring. The third cooling channel is provided between two adjacent iron cores.

9. The rotor assembly of the axial motor according to claim 1, characterized in that, The rotor back plate is provided with a first positioning part, and the iron core is provided with a second positioning part. The rotor back plate and the iron core are positioned by the cooperation of the first positioning part and the second positioning part, and the movement of the iron core relative to the rotor back plate in the radial or circumferential direction of the rotor assembly is restricted.

10. The rotor assembly of the axial motor according to claim 1, characterized in that, The rotor assembly also includes a magnet connected to the iron core. A fourth cooling channel is provided between the magnet and the iron core. The fourth cooling channel is used for the flow of cooling medium. The cooling medium can exchange heat with the magnet and the iron core. The fourth cooling channel is connected to the third cooling channel. The fourth cooling channel extends radially along the rotor assembly and extends to the outer edge of the rotor back plate, so that the rotation of the rotor assembly can drive the cooling medium to flow out through the fourth cooling channel.

11. The rotor assembly of the axial motor according to claim 10, characterized in that, A second groove is provided on the side of the magnet facing the iron core and / or on the side of the iron core facing the magnet. The iron core is connected to the magnet to close the opening of the second groove, so that the second groove is configured as the fourth cooling channel. The second groove extends along the radial direction of the rotor assembly, and the two ends of the second groove in the radial direction of the rotor assembly are set as open ends.

12. The rotor assembly of the axial motor according to claim 11, characterized in that, The iron core has a second groove on the side facing the magnet; The iron core has a first groove on the side facing away from the magnet. The iron core is connected to one side of the rotor back plate to close the opening of the first groove, so that the first groove is configured as at least part of the third cooling channel. In the axial direction of the rotor assembly, the first groove and the second groove on the iron core are misaligned.

13. The rotor assembly of the axial motor according to claim 1, characterized in that, The rotor back plate includes a plate and a boss formed in the middle of one side of the plate. The connecting hole penetrates the plate and the boss. The second cooling channel penetrates the boss in the radial direction of the rotor assembly. The iron core is connected to the plate. In the radial direction of the rotor assembly, the iron core is located on the side of the boss.

14. The rotor assembly of the axial motor according to claim 13, characterized in that, The second cooling channel extends along the radial direction of the rotor assembly, one end of the second cooling channel is disposed on the hole wall of the connecting hole, and the other end of the second cooling channel is disposed on the side of the boss in the radial direction of the rotor assembly.

15. The rotor assembly of the axial motor according to claim 1, characterized in that, The rotating shaft has a cavity, and the outer peripheral wall of the rotating shaft is in contact with the wall of the connecting hole. The cavity is used for the flow of cooling medium. The rotating shaft has a through hole, the axis of which extends along the radial direction of the rotor assembly and communicates with the cavity. The cavity and the through hole cooperate to form the first cooling channel, and one end of the second cooling channel communicates with the through hole.

16. The rotor assembly of the axial motor according to claim 15, characterized in that, The number of through holes is set to an even number, and every two through holes form a group. The two through holes in a group are symmetrically arranged with the axis of the rotor assembly as the axis of symmetry. The number of the second cooling channels is set to an even number, and each channel corresponds to one of the through holes.

17. The rotor assembly of the axial motor according to claim 15, characterized in that, The rotating shaft has an inlet at at least one end in the axial direction of the rotor assembly, the inlet is in communication with the cavity, and the inlet is used to allow the cooling medium to enter the cavity.

18. The rotor assembly of the axial motor according to any one of claims 1-17, characterized in that, The rotor assembly further includes a magnet and a sealing cover. The magnet is connected to the side of the iron core facing away from the rotor back plate. The sealing cover is connected to the rotor back plate. In the axial direction of the rotor assembly, the sealing cover is located on one side of the magnet and covers the magnet. The sealing cover is close to the stator assembly and is used to restrict the flow of the cooling medium toward the stator assembly.

19. The rotor assembly of the axial motor according to claim 18, characterized in that, In the radial direction of the rotor assembly, the circumferential edge of the sealing cover protrudes from the magnet.

20. The rotor assembly of the axial motor according to claim 18, characterized in that, The sealing cover is provided with reinforcing ribs that extend in the radial direction of the rotor assembly.

21. The rotor assembly of the axial motor according to claim 18, characterized in that, The magnet has a receiving step on the side facing away from the iron core, and a portion of the sealing cover facing the magnet can be connected to the receiving step. The receiving step is provided with an adhesive part, and the receiving step is bonded to a part of the sealing cover plate through the adhesive part.

22. An axial flux motor, characterized in that, The rotor assembly of the axial motor as described in any one of claims 1-21.

23. A vehicle, characterized in that, The rotor assembly includes the axial motor as described in any one of claims 1-21, or the axial flux motor as described in claim 22.

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