Rotor assembly and electric machine

Abstract

The utility model provides a kind of rotor assembly and motor, rotor assembly includes rotating shaft, support structure, magnetic steel structure and heat conduction structure, support structure is fixed in rotating shaft, magnetic steel structure is set to the outer periphery of rotating shaft and and rotating shaft interval, the space between rotating shaft and magnetic steel structure forms the magnetic steel cooling channel for ventilation, heat conduction structure and support structure, magnetic steel structure are fixedly connected, the heat conductivity of heat conduction structure is greater than magnetic steel structure, heat conduction structure is used to support magnetic steel structure and carries out heat dissipation to magnetic steel structure.In the present scheme, magnetic steel structure is arranged at the outer periphery of rotating shaft, and the interval setting with rotating shaft is realized by support structure and heat conduction structure, avoid magnetic steel structure and rotating shaft direct contact and affect the heat dissipation effect of the inner surface of magnetic steel structure, the magnetic steel cooling channel formed between magnetic steel structure and rotating shaft realizes that cooling wind is directly sent to magnetic steel structure surface, reduce the heat accumulation of magnetic steel structure when motor operates, improve heat dissipation efficiency.

Description

Technical Field

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

[0002] High-speed motors, characterized by their high speed, high power density, and high efficiency, have been widely used in aerospace, rail transportation, and new energy power generation. However, during operation, high-speed motors generate a large amount of heat due to the superposition of electromagnetic losses, eddy current losses, and mechanical losses. In particular, temperature control of the stator windings, core, and rotor magnets has become a key issue restricting performance improvement.

[0003] Traditional air-cooled systems primarily remove heat generated by the motor through forced air circulation. However, high-speed motors have a much higher heat flux density than ordinary motors, and their internal space is limited. Traditional air-cooled systems struggle to effectively address localized overheating issues. As motor speed increases, the rotor assembly becomes more complex, and its temperature rise also increases. Due to the limitations of the rotor assembly and cooling airflow, stable heat dissipation from the magnet structure is impossible, impacting motor efficiency and lifespan. Utility Model Content

[0004] This invention provides a rotor assembly and a motor to solve the problem that existing motors cannot stably dissipate heat from the magnet structure in the rotor assembly.

[0005] To address the aforementioned problems, according to one aspect of this utility model, a rotor assembly is provided, comprising a rotating shaft, a support structure, a magnet structure, and a heat-conducting structure. The support structure is fixed to the rotating shaft, and the magnet structure is disposed on the outer periphery of the rotating shaft and spaced apart from the rotating shaft. The space between the rotating shaft and the magnet structure forms a magnet cooling channel for ventilation. The heat-conducting structure is fixedly connected to the support structure and the magnet structure. The thermal conductivity of the heat-conducting structure is greater than that of the magnet structure. The heat-conducting structure is used to support the magnet structure and dissipate heat from the magnet structure.

[0006] Furthermore, the heat-conducting structure includes multiple heat-conducting rods distributed circumferentially along the axis of rotation. Each heat-conducting rod passes through the magnetic steel structure and the support structure, and the end of the heat-conducting rod protrudes outside the support structure.

[0007] Furthermore, the magnetic steel structure includes multiple arc-shaped magnetic steel blocks, which are sequentially spliced ​​to form a ring structure. Each magnetic steel block has a through-hole, through which the heat-conducting rod passes.

[0008] Furthermore, the support structure includes two support rings, which are fixed at a distance from the rotating shaft. Each end of the heat-conducting rod passes through one support ring, and the magnetic steel structure is located between the two support rings.

[0009] Furthermore, the support structure has an air outlet that runs through the axis of rotation, and the air outlet is connected to the magnetic steel cooling channel; the support structure and the rotating shaft are either an integral structure or separate structures.

[0010] Furthermore, there are at least two magnet structures, with two adjacent magnet structures spaced apart axially on the rotating shaft. The space between two adjacent magnet structures forms a rotor input channel for air intake, and the rotor input channel is connected to the magnet cooling channel.

[0011] Furthermore, the heat-conducting structure is made of titanium alloy, and the rotor assembly also includes a rotor sheath fitted over the magnet structure; and / or, the magnet structure has ventilation and cooling holes that extend through the shaft along the axis of rotation.

[0012] According to another aspect of the present invention, the present invention also provides an electric motor, the electric motor including a stator assembly and the aforementioned rotor assembly, the rotor assembly passing through the stator assembly.

[0013] Furthermore, the stator assembly includes a first stator core, a second stator core, and a connecting structure. The first stator core and the second stator core are axially spaced apart on the rotating shaft, and the connecting structure is fixedly connected to both the first stator core and the second stator core. The space between the first stator core and the second stator core forms a stator input channel for air intake. The stator input channel is connected to the magnet cooling channel, and the air gap between the stator assembly and the rotor assembly is connected to the stator input channel.

[0014] Furthermore, both the first stator core and the second stator core have multiple stator slots distributed circumferentially, and the stator slots are connected to the stator input channel; the axial dimension of the stator input channel in the rotating shaft is 15mm-20mm, and / or the axial dimension of the magnet cooling channel in the rotating shaft is 15mm-20mm.

[0015] Furthermore, the first stator core has a plurality of first slots circumferentially distributed on the side facing the second stator core, and the second stator core has a plurality of second slots circumferentially distributed on the side facing the first stator core; the connection structure includes a plurality of plug-in components, one end of each plug-in component is inserted into a corresponding first slot, and the other end is inserted into a corresponding second slot.

[0016] Furthermore, the stator assembly also includes a spacer block sandwiched between the first stator core and the second stator core, and the connection structure includes multiple connecting rods that pass through the first stator core, the spacer block, and the second stator core.

[0017] Furthermore, the first stator core, the spacer block, and the second stator core all have through trapezoidal slots, and the radial section of the connecting rod matches the trapezoidal slot, with the connecting rod passing through the corresponding trapezoidal slot; or, the first stator core, the spacer block, and the second stator core all have connecting holes, and the radial section of the connecting rod matches the connecting hole, with the connecting rod passing through the corresponding connecting hole.

[0018] Furthermore, the motor also includes a housing, in which the stator assembly and rotor assembly are both installed. The housing has an air inlet at its axial center and air outlets at both axial ends. The air inlet is connected to the stator input channel, the magnet cooling channel, and the air gap is connected to the air outlet.

[0019] In this design, the support structure is fixed to the rotating shaft, providing support and fixation for the magnet structure while maintaining a distance between them. The magnet structure is positioned on the outer periphery of the rotating shaft, avoiding direct contact between the magnet structure and the shaft, which would affect the heat dissipation of the inner surface of the magnet structure. The cooling channel formed between the magnet structure and the rotating shaft allows cooling air to be directly delivered to the surface of the magnet structure for direct heat exchange, reducing heat accumulation on the magnet structure during motor operation and ensuring motor efficiency. The heat-conducting structure supports the magnet structure, maintaining a distance between it and the rotating shaft. Furthermore, its thermal conductivity is greater than that of the magnet structure, allowing for further heat dissipation from the magnet structure, thereby improving motor efficiency and safety, and extending its service life. Attached Figure Description

[0020] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0021] Figure 1 A schematic diagram of the rotor assembly provided in an embodiment of the present invention is shown;

[0022] Figure 2 It shows Figure 1 Radial sectional view of the central rotor assembly at the magnet structure;

[0023] Figure 3 It shows Figure 1 A schematic diagram of the rotor assembly without the magnet structure and rotor sheath;

[0024] Figure 4 It shows Figure 1 A schematic diagram of the structure of the magnet block in the rotor assembly;

[0025] Figure 5 A schematic diagram of the cooling airflow path of the motor provided in an embodiment of this utility model is shown;

[0026] Figure 6 A schematic diagram of the structure of a stator assembly provided by an embodiment of the present invention is shown;

[0027] Figure 7 A schematic diagram of another stator assembly provided by an embodiment of the present invention is shown;

[0028] Figure 8 A schematic diagram of another stator assembly provided by an embodiment of the present invention is shown.

[0029] The above figures include the following reference numerals:

[0030] 10. Shaft;

[0031] 20. Support structure; 21. Support ring;

[0032] 30. Magnetic steel structure; 31. Magnetic steel block; 311. Mating hole;

[0033] 40. Thermally conductive structure; 41. Thermally conductive rod;

[0034] 51. Magnet cooling channel; 52. Air outlet; 53. Rotor input channel; 54. Stator input channel; 55. Stator slot;

[0035] 60. Rotor sheath;

[0036] 71. First stator core; 72. Second stator core; 721. Second slot; 73. Connecting structure; 731. Connector; 732. Connecting rod; 74. Spacer block; 75. Trapezoidal slot; 76. Connecting hole. Detailed Implementation

[0037] The technical solutions in at least one embodiment will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. The following description of at least one embodiment is merely illustrative and is not intended to limit this application or its applications. Other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are all within the scope of protection of this application.

[0038] like Figures 1 to 4As shown, an embodiment of this utility model provides a rotor assembly, including a rotating shaft 10, a support structure 20, a magnet structure 30, and a heat-conducting structure 40. The support structure 20 is fixed to the rotating shaft 10, and the magnet structure 30 is disposed on the outer periphery of the rotating shaft 10 and spaced apart from the rotating shaft 10. The space between the rotating shaft 10 and the magnet structure 30 forms a magnet cooling channel 51 for ventilation. The heat-conducting structure 40 is fixedly connected to the support structure 20 and the magnet structure 30. The thermal conductivity of the heat-conducting structure 40 is greater than that of the magnet structure 30. The heat-conducting structure 40 is used to support the magnet structure 30 and dissipate heat from the magnet structure 30.

[0039] In this design, the support structure 20 is fixed to the rotating shaft 10, providing support and fixation for the magnet structure 30, and is spaced apart from the support structure 20. The magnet structure 30 is set on the outer periphery of the rotating shaft 10 and spaced apart from it, avoiding direct contact between the magnet structure 30 and the rotating shaft 10, which would affect the heat dissipation effect of the inner surface of the magnet structure 30. The magnet cooling channel 51 formed between the magnet structure 30 and the rotating shaft 10 allows cooling air to be directly delivered to the surface of the magnet structure 30, enabling direct heat exchange and reducing heat accumulation in the magnet structure 30 during motor operation, thus ensuring the operating efficiency of the motor. The heat-conducting structure 40 is used to support the magnet structure 30, achieving the spaced arrangement between the magnet structure 30 and the rotating shaft 10. At the same time, its thermal conductivity is greater than that of the magnet structure 30, and the heat-conducting structure 40 can further dissipate heat from the magnet structure 30, thereby improving the operating efficiency and safety of the motor and extending its service life.

[0040] like Figure 1 As shown, the heat-conducting structure 40 includes multiple heat-conducting rods 41, which are distributed circumferentially along the rotating shaft 10. Each heat-conducting rod 41 passes through the magnet structure 30 and the support structure 20, with its end protruding outside the support structure 20. The heat-conducting rods 41 act as heat transfer media, transferring heat from the magnet structure 30. Their circumferential distribution along the rotating shaft 10 and their protruding ends improve the heat dissipation of the rotor assembly, prevent localized high temperatures in the magnets, and enhance the overall efficiency and reliability of the motor.

[0041] like Figure 1 , Figure 4 As shown, the magnetic steel structure 30 includes multiple arc-shaped magnetic steel blocks 31, which are sequentially spliced ​​to form a ring structure. Each magnetic steel block 31 has a through-hole 311 through which the heat-conducting rod 41 passes. The tight connection between the mating holes 311 of the magnetic steel blocks 31 and the heat-conducting rod 41 effectively transfers heat from the magnetic steel blocks 31 to the heat-conducting rod 41. The arc-shaped design and splicing method of the magnetic steel blocks 31 improve the flexibility of the magnetic steel structure 30. This arrangement ensures uniform cooling of the magnetic steel blocks 31, avoiding performance degradation caused by localized overheating.

[0042] like Figure 1 , Figure 3 As shown, the support structure 20 includes two support rings 21, which are fixed to the rotating shaft 10 at intervals. Each end of the heat-conducting rod 41 passes through one support ring 21, and the magnet structure 30 is located between the two support rings 21. The connection between the support rings 21, the rotating shaft 10, and the magnet structure 30 forms a stable frame structure, providing positioning and support for the magnet structure 30, ensuring the stability of the heat-conducting rods 41, guaranteeing the smooth flow of cooling air in the magnet cooling channel 51, enhancing the structural strength of the rotor assembly, promoting uniform heat distribution, and helping the motor maintain good performance during high-speed operation.

[0043] In some embodiments, the support structure 20 has an air outlet 52 extending axially along the shaft 10, and the air outlet 52 is connected to the magnet cooling channel 51; the support structure 20 and the shaft 10 are either an integral structure or separate structures. The design of the air outlet 52 allows the cooling air to be smoothly discharged after cooling, avoiding the retention of high-temperature cooling air inside the rotor assembly; the choice between an integral or separate structure for the support structure 20 and the shaft 10 can meet the needs of different application scenarios. If it is an integral structure, it helps to improve the overall structure and enhance the structural strength and stability; if it is a separate structure, it is easy to disassemble and maintain, improving the convenience of maintenance.

[0044] Optionally, the air outlet 52 is arc-shaped, and multiple outlets are arranged along the circumference of the rotating shaft 10. This arrangement ensures smooth airflow, improves cooling efficiency, and promptly discharges the high-temperature cooling air after cooling is complete.

[0045] like Figure 2 , Figure 5 As shown, there are at least two magnet structures 30, with adjacent magnet structures 30 spaced axially along the rotating shaft 10. The space between two adjacent magnet structures 30 forms a rotor input channel 53 for air intake, which is connected to the magnet cooling channel 51. The segmented design of the magnet structure 30 increases the flow area of ​​the cooling air, allowing the cooling air to directly enter the magnet cooling channel 51 through the rotor input channel 53, accelerating heat dissipation, optimizing the flow path of the cooling air, reducing the temperature of the magnet structure 30, and improving the operating stability and efficiency of the motor.

[0046] like Figure 1 , Figure 2As shown, the heat-conducting structure 40 is made of titanium alloy, and the rotor assembly also includes a rotor sleeve 60, which is fitted onto the magnet structure 30; and / or, the magnet structure 30 has ventilation and cooling holes that extend through the shaft 10 axially. Titanium alloy possesses excellent thermal conductivity and lightweight characteristics, which helps improve heat transfer efficiency while reducing the weight of the rotor assembly; the rotor sleeve 60 protects the magnet structure 30, preventing external environmental factors from affecting the normal operation of the rotor assembly; the ventilation and cooling holes allow cooling air to circulate within the magnet structure 30, enhancing the cooling performance of the rotor assembly and improving the motor's speed and operational stability.

[0047] like Figures 5 to 8 As shown, an embodiment of this utility model also provides an electric motor, which includes a stator assembly and the aforementioned rotor assembly, with the rotor assembly passing through the stator assembly. The magnet cooling channel 51 of the rotor assembly is connected to the air gap of the stator assembly, forming an efficient ventilation path. The cooling air directly enters the rotor assembly for cooling after passing through the stator assembly, achieving direct cooling of key parts of the motor, improving the cooling efficiency of the motor, enhancing the stability of the motor, and extending its service life.

[0048] like Figure 5 , Figure 6 As shown, the stator assembly includes a first stator core 71, a second stator core 72, and a connecting structure 73. The first stator core 71 and the second stator core 72 are axially spaced apart on the rotating shaft 10. The connecting structure 73 is fixedly connected to both the first stator core 71 and the second stator core 72. The space between the first stator core 71 and the second stator core 72 forms a stator input channel 54 for air intake. The stator input channel 54 is connected to the magnet cooling channel 51, and the air gap between the stator assembly and the rotor assembly is connected to the stator input channel 54. The segmented design of the stator core and the use of the connecting structure 73, along with the connection between the stator input channel 54 and the magnet cooling channel 51, form the stator input channel 54. This allows cooling air to directly enter the rotor assembly after passing through the stator assembly, achieving efficient cooling of key parts of the motor.

[0049] like Figure 5 , Figure 6 As shown, both the first stator core 71 and the second stator core 72 have multiple stator slots 55 distributed circumferentially, and the stator slots 55 are connected to the stator input channel 54. The axial dimension of the stator input channel 54 in the rotating shaft 10 is 15mm-20mm, and / or the axial dimension of the magnet cooling channel 51 in the rotating shaft 10 is 15mm-20mm. The axial dimension design of the stator input channel 54 and the magnet cooling channel 51 optimizes the flow path of the cooling air. The reasonable size range helps to optimize the distribution of cooling air, improve the cooling efficiency of the motor, reduce the overall temperature rise of the motor, enhance the stability of the motor, and extend its service life.

[0050] In some embodiments, such as Figure 6 As shown, the first stator core 71 has multiple first slots circumferentially distributed on the side facing the second stator core 72, and the second stator core 72 has multiple second slots 721 circumferentially distributed on the side facing the first stator core 71. The connection structure 73 includes multiple connectors 731, one end of each connector 731 is inserted into a corresponding first slot, and the other end is inserted into a corresponding second slot 721. The arrangement of the first and second slots 721 and the use of the connectors 731 ensure a stable connection between the first stator core 71 and the second stator core 72. The insertion depth of the connectors 731 in the first and second slots 721 determines the width of the stator input channel 54. The first stator core 71 and the second stator core 72 are spaced apart by the connectors 731 to form the stator input channel 54, realizing smooth flow of cooling air in the stator input channel 54 and improving the flow efficiency of cooling air.

[0051] Optionally, the connector 731 is an L-shaped plate with a clearance fit, and is fixed with epoxy resin AB glue after insertion. This design improves the stable connection between the connector 731 and the first and second slots, reduces the risk of stator assembly structural deformation during high-speed motor operation, and improves the stability and operating efficiency of the electronic assembly.

[0052] In some embodiments, such as Figure 7 , Figure 8 As shown, the stator assembly also includes a spacer block 74, which is sandwiched between the first stator core 71 and the second stator core 72. The connecting structure 73 includes multiple connecting rods 732, which pass through the first stator core 71, the spacer block 74, and the second stator core 72. The spacer block 74 ensures an appropriate distance between the first stator core 71 and the second stator core 72, forming the stator input channel 54. The use of the connecting rods 732 enhances the structural stability of the stator assembly, ensures uniform distribution of cooling air, and improves cooling efficiency and operational stability.

[0053] In some embodiments, such as Figure 7 As shown, the first stator core 71, the spacer block 74, and the second stator core 72 all have through trapezoidal slots 75. The radial section of the connecting rod 732 matches the trapezoidal slot 75, and the connecting rod 732 passes through the corresponding trapezoidal slot 75. The design of the trapezoidal slot 75 and the matching use of the connecting rod 732 ensure the stability and strength of the connection structure 73. The tight fit between the connecting rod 732 and the trapezoidal slot 75 not only enhances the structural stability of the stator assembly but also ensures the smooth flow of cooling air in the stator input channel 54, improving the efficiency of cooling air flow.

[0054] In some embodiments, such as Figure 8 As shown, the first stator core 71, the spacer block 74, and the second stator core 72 all have connecting holes 76. The radial section of the connecting rod 732 matches the connecting hole 76, and the connecting rod 732 passes through the corresponding connecting hole 76. The setting of the connecting hole 76 and the matching use of the connecting rod 732 ensure the stability and strength of the connection structure 73. The tight fit between the connecting rod 732 and the connecting hole 76 not only enhances the structural stability of the stator assembly but also ensures the smooth flow of cooling air in the stator input channel 54, improving the flow efficiency of the cooling air.

[0055] In some embodiments, the motor further includes a housing, within which both the stator assembly and the rotor assembly are mounted. The housing has an air inlet at its axial center and air outlets at both axial ends. The air inlet is connected to the stator input channel 54, the magnet cooling channel 51, and the air gap, all of which are connected to the air outlets. This connection between the air inlet and the stator input channel 54, and between the magnet cooling channel 51, the air gap, and the air outlets, creates a circulation path where cooling air enters from the inlet, undergoes heat exchange with the stator assembly and rotor assembly, and exits from the outlet. This achieves efficient cooling of critical motor components, improves cooling efficiency, reduces overall motor temperature rise, enhances motor stability, and extends equipment lifespan.

[0056] When the motor starts and runs, cooling air enters through the axial central air inlet of the housing. It first passes through the stator input channel 54 between the first stator core 71 and the second stator core 72 of the stator assembly, where it exchanges heat with the stator cores and windings, absorbing the heat generated. Subsequently, the cooling air passes through the gap between the stator assembly and the rotor assembly, the magnet cooling channel 51 of the rotor assembly, and other cooling channels, exchanging heat with components that experience significant temperature rise, such as the magnet structure 30. Finally, the heated cooling air is discharged from the axial air outlets at both ends of the housing through the air outlet 52 of the support structure 20 and the heat-conducting structure 40, achieving efficient cooling of critical parts of the motor. Throughout the entire operation, the cooling air flow path is carefully designed to ensure uniform heat distribution and efficient heat dissipation, thereby improving the motor's operational stability and efficiency, and extending its service life.

[0057] The above descriptions are merely some embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

[0058] The technical features of the embodiments described above can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combination of these technical features does not contradict each other, it should be considered to be within the scope of this specification.

[0059] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0060] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as exemplary only and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0061] In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms 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, and therefore should not be construed as a limitation on the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0062] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0063] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this application.

Claims

1. A rotor assembly, characterized in that, The device includes a rotating shaft (10), a supporting structure (20), a magnetic steel structure (30), and a heat-conducting structure (40). The supporting structure (20) is fixed to the rotating shaft (10). The magnetic steel structure (30) is disposed on the outer periphery of the rotating shaft (10) and spaced apart from the rotating shaft (10). The space between the rotating shaft (10) and the magnetic steel structure (30) forms a magnetic steel cooling channel (51) for ventilation. The heat-conducting structure (40) is fixedly connected to the supporting structure (20) and the magnetic steel structure (30). The thermal conductivity of the heat-conducting structure (40) is greater than that of the magnetic steel structure (30). The heat-conducting structure (40) is used to support the magnetic steel structure (30) and dissipate heat from the magnetic steel structure (30).

2. The rotor assembly according to claim 1, characterized in that, The heat-conducting structure (40) includes a plurality of heat-conducting rods (41), which are distributed circumferentially along the rotating shaft (10). Each heat-conducting rod (41) passes through the magnet structure (30) and the support structure (20), and the end of the heat-conducting rod (41) protrudes outside the support structure (20).

3. The rotor assembly according to claim 2, characterized in that, The magnetic steel structure (30) includes multiple arc-shaped magnetic steel blocks (31), which are sequentially spliced ​​to form a ring structure. Each magnetic steel block (31) has a through mating hole (311), and the heat-conducting rod (41) passes through the corresponding mating hole (311).

4. The rotor assembly according to claim 2, characterized in that, The support structure (20) includes two support rings (21), which are fixed at intervals to the rotating shaft (10). The two ends of each heat-conducting rod (41) pass through one of the support rings (21), and the magnetic steel structure (30) is located between the two support rings (21).

5. The rotor assembly according to claim 1, characterized in that, The support structure (20) has an air outlet (52) that extends through the axis of the rotating shaft (10), and the air outlet (52) is connected to the magnetic steel cooling channel (51); the support structure (20) and the rotating shaft (10) are an integral structure or a separate structure.

6. The rotor assembly according to claim 1, characterized in that, There are at least two magnet structures (30), and two adjacent magnet structures (30) are arranged axially at intervals on the rotating shaft (10). The space between two adjacent magnet structures (30) forms a rotor input channel (53) for air intake. The rotor input channel (53) and the magnet cooling channel (51) are connected.

7. The rotor assembly according to claim 1, characterized in that, The heat-conducting structure (40) is made of titanium alloy, and the rotor assembly also includes a rotor sleeve (60), which is fitted onto the magnet structure (30); and / or, the magnet structure (30) has ventilation and cooling holes that are axially disposed along the shaft (10).

8. An electric motor, characterized in that, The motor includes a stator assembly and a rotor assembly according to any one of claims 1 to 7, the rotor assembly passing through the stator assembly.

9. The motor according to claim 8, characterized in that, The stator assembly includes a first stator core (71), a second stator core (72), and a connecting structure (73). The first stator core (71) and the second stator core (72) are axially spaced on the rotating shaft (10). The connecting structure (73) is fixedly connected to both the first stator core (71) and the second stator core (72). The space between the first stator core (71) and the second stator core (72) forms a stator input channel (54) for air intake. The stator input channel (54) is connected to the magnet cooling channel (51), and the air gap between the stator assembly and the rotor assembly is connected to the stator input channel (54).

10. The motor according to claim 9, characterized in that, The first stator core (71) and the second stator core (72) are both circumferentially distributed with multiple stator slots (55), and the stator slots (55) are connected to the stator input channel (54); the stator input channel (54) has an axial dimension of 15mm-20mm in the rotating shaft (10), and / or the magnet cooling channel (51) has an axial dimension of 15mm-20mm in the rotating shaft (10).

11. The motor according to claim 9, characterized in that, The first stator core (71) has a plurality of first slots distributed circumferentially on the side facing the second stator core (72), and the second stator core (72) has a plurality of second slots (721) distributed circumferentially on the side facing the first stator core (71); the connection structure (73) includes a plurality of plug-in pieces (731), one end of each plug-in piece (731) is inserted into a corresponding first slot, and the other end is inserted into a corresponding second slot (721).

12. The motor according to claim 9, characterized in that, The stator assembly further includes a spacer block (74) sandwiched between the first stator core (71) and the second stator core (72). The connection structure (73) includes a plurality of connecting rods (732) that pass through the first stator core (71), the spacer block (74), and the second stator core (72).

13. The motor according to claim 12, characterized in that, The first stator core (71), the spacer block (74) and the second stator core (72) all have through trapezoidal slots (75), the radial section of the connecting rod (732) matches the trapezoidal slot (75), and the connecting rod (732) passes through the corresponding trapezoidal slot (75). Alternatively, the first stator core (71), the spacer block (74), and the second stator core (72) all have connecting holes (76), the radial section of the connecting rod (732) matches the connecting hole (76), and the connecting rod (732) passes through the corresponding connecting hole (76).

14. The motor according to claim 9, characterized in that, The motor also includes a housing, in which the stator assembly and the rotor assembly are both installed. The housing has an air inlet at its axial center and air outlets at both axial ends. The air inlet is connected to the stator input channel (54), the magnet cooling channel (51), and the air gap is connected to the air outlet.

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