Motor rotor and motor

Abstract

The utility model relates to motor technical field, specifically disclose motor rotor and motor. The motor rotor includes axle module, main body module and fan blade, main body module sets up along the working direction, and main body module includes rotor back iron, a plurality of uniform heat plate and a plurality of Halbach array, and rotor back iron has the rotation axis hole and the vent hole along the working direction extension, axle module is threaded in the rotation axis hole, and the number of vent hole is same with uniform heat plate, and the hole wall of each vent hole is embedded with a uniform heat plate, and all vent holes are spaced uniformly around the axis of rotation axis hole, and all Halbach array are spaced uniformly around the axis of rotation axis hole, and are located at the outside of vent hole, and Halbach array is threaded in rotor back iron and extends along the working direction, and the fan blade is provided with two and is separated in the both ends of main body module, and axle module is coaxially threaded fan blade. The motor rotor adopts the composite heat dissipation mechanism of phase change conduction and forced convection, improves the heat dissipation efficiency, and maintains high torque density.

Description

Technical Field

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

[0002] As the core component of an electric motor that enables electromechanical energy conversion, the motor rotor is widely used in industrial fields requiring high power and torque densities, such as new energy vehicle drives and wind power generation. In these applications, the motor rotor typically needs to withstand complex alternating electromagnetic fields, and significant eddy current losses are easily generated inside, especially in the permanent magnet region, which are then converted into a large amount of Joule heat. At the same time, in pursuit of higher torque density, the air gap design of the motor rotor is often quite narrow, which further restricts the space for heat convection and diffusion, causing heat to accumulate rapidly inside the rotor and in the air gap region.

[0003] Heat buildup inside the rotor directly leads to an increase in the operating temperature of the permanent magnet. When the temperature exceeds the tolerance limit of the permanent magnet material, irreversible demagnetization may occur, resulting in a decrease in motor output torque, reduced transmission efficiency, and in severe cases, even motor failure. Therefore, how to achieve rapid and efficient heat dissipation from inside the rotor while ensuring high torque density output capability has been a key technical challenge in this field for a long time.

[0004] On the other hand, to improve heat dissipation inside the rotor, a common approach is to incorporate ventilation paths into the rotor structure to enhance air convection. However, as a crucial component of the magnetic circuit, any reduction in the magnetic cross-sectional area of ​​the rotor back iron directly affects the air gap flux density, thereby reducing the motor's torque density. In other words, the introduction of heat dissipation structures often presents a structural contradiction with the motor's goal of achieving high torque density.

[0005] Furthermore, during high-speed rotation, the uniformity of the mass distribution of the motor rotor has a decisive impact on its dynamic balance characteristics. Any asymmetrical or eccentrically arranged components can cause vibration, noise, and bearing wear, reducing system reliability and lifespan. Therefore, when integrating additional functional components into the rotor, the overall dynamic balance performance must be fully considered. Utility Model Content

[0006] The purpose of this invention is to provide a motor rotor and motor that improves heat dissipation efficiency while maintaining high torque density.

[0007] To achieve this objective, the present invention adopts the following technical solution:

[0008] The motor rotor includes a shaft module, a main body module, and fan blades. The main body module is arranged along the working direction and includes a rotor back iron, multiple heat spreaders, and multiple Halebeck arrays. The rotor back iron has a shaft hole and ventilation holes extending along the working direction. The shaft module passes through the shaft hole. The number of ventilation holes is the same as the number of heat spreaders, and a heat spreader is embedded in the wall of each ventilation hole. All ventilation holes are evenly spaced around the axis of the shaft hole. All Halebeck arrays are evenly spaced around the axis of the shaft hole and located outside the ventilation holes. The Halebeck arrays pass through the rotor back iron and extend along the working direction. Each Halebeck array includes a first permanent magnet, two second permanent magnets, and two third permanent magnets. The first permanent magnet is located between the two second permanent magnets. The first permanent magnet and two second permanent magnets are evenly distributed around the axis of the rotating shaft hole. The magnetization direction of the first permanent magnet is radially away from the rotating shaft hole, and the magnetization direction of the second permanent magnets is radially closer to the rotating shaft hole. Each third permanent magnet is disposed between the first permanent magnet and one of the second permanent magnets. In the direction away from the rotating shaft hole, the width direction of the third permanent magnet gradually approaches the first permanent magnet, and the magnetization direction of the third permanent magnet is radially closer to the first permanent magnet. The fan blades are provided in two and located at both ends of the main body module. The shaft module coaxially passes through the fan blades. One fan blade is used to guide gas into one end of the ventilation hole, and the other fan blade is used to guide the gas out from the other end of the ventilation hole.

[0009] As an optional technical solution for the motor rotor, the heat spreader plate is attached to the side of the ventilation hole wall away from the shaft hole.

[0010] As an optional technical solution for the motor rotor, the cross-section of the ventilation hole is a fan ring, the cross-section of the heat spreader is U-shaped, the middle part of the heat spreader is in contact with the outer arc surface of the ventilation hole, and the two sides of the heat spreader are each in contact with one straight edge surface of the ventilation hole.

[0011] As an optional technical solution for the motor rotor, the number of ventilation holes is the same as that of the Halebeck array, and the center of the ventilation hole corresponds one-to-one with the center of the Halebeck array in the radial direction of the shaft hole.

[0012] As an optional technical solution for the motor rotor, the shaft module includes an input shaft and a first positioning key and two second positioning keys embedded on the input shaft. The rotor back iron is circumferentially positioned and connected to the input shaft through the first positioning key, and each fan blade is circumferentially positioned and connected to the input shaft through one of the second positioning keys.

[0013] As an optional technical solution for the motor rotor, the input shaft is a stepped shaft with a larger outer diameter in the middle section and a smaller outer diameter at both ends. The rotor back iron is sleeved on the middle section of the input shaft. The shaft module also includes two locking rings, which are sleeved on the input shaft and are used to axially fix the fan blades.

[0014] As an optional technical solution for the motor rotor, the heat spreader is attached to the ventilation hole by applying a thin layer of epoxy resin adhesive.

[0015] As an optional technical solution for the motor rotor, the rotor back iron is a cylinder, and the axis of the rotor back iron coincides with the axis of the shaft hole.

[0016] As an optional technical solution for the motor rotor, the first permanent magnet, the second permanent magnet, and the third permanent magnet are all rectangular parallelepipeds.

[0017] An electric motor includes a housing and the aforementioned motor rotor, wherein the motor rotor is disposed within the housing, and the end of the shaft module is rotatably connected to the housing.

[0018] The beneficial effects of this utility model are:

[0019] This motor rotor forms an active and efficient heat dissipation circuit by embedding a heat spreader plate within the ventilation holes of the rotor back iron and installing coaxially driven fan blades at both ends of the main module. One fan blade guides cool air into the ventilation holes, while the other fan blade extracts the hot air that has absorbed heat, forcing airflow across the surface of the heat spreader plate. The heat spreader plate utilizes the phase change principle of its internal working fluid, possessing an extremely high equivalent thermal conductivity, enabling it to rapidly transfer the heat generated inside the motor rotor to the ventilation hole walls, where it is then carried away by the forced convection airflow. This combined phase change conduction and forced convection heat dissipation mechanism helps achieve efficient heat dissipation synergy, effectively solving the problem of narrow air gaps and heat accumulation in magnetic field-modulated motors. Simultaneously, the ventilation holes on the rotor back iron reduce the magnetic cross-sectional area of ​​the motor rotor, leading to a decrease in torque density. This is compensated for by using a Heilbeck array with a specific arrangement and magnetization direction outside the ventilation holes. The Heilbeck array, through its unique magnetization layout, guides and converges the originally radially or parallel magnetized magnetic lines of force to the air gap side, significantly improving the air gap magnetic flux density. Therefore, the aforementioned structure can offset or even compensate for the torque loss caused by the ventilation holes, ensuring that the motor maintains high torque density output while achieving high heat dissipation efficiency, thus meeting the demands of high torque operating conditions. Furthermore, the heat spreader, ventilation holes, and Helbeck array are all integrated onto the rotor back iron and evenly distributed circumferentially, ensuring the dynamic balance characteristics of the motor rotor. The fan blades are coaxially connected to the shaft module, utilizing the motor's own rotational drive, eliminating the need for an additional power source, resulting in a compact and reliable structure.

[0020] The motor's housing, rotor, and fan blades work together to form a closed or semi-closed airflow system that allows air to enter from one end of the motor, flow through ventilation holes, and exit from the other end. This optimizes the organization of cooling airflow, avoids short-circuiting or turbulence, and improves the overall efficiency of the heat dissipation system. This motor solves the long-standing heat dissipation problem of magnetic field modulation motors while maintaining high torque density. It is particularly suitable for applications with confined spaces, difficult heat dissipation, and extremely high torque density requirements, giving it a significant competitive advantage and promising application prospects. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the motor rotor provided in an embodiment of this utility model;

[0022] Figure 2 This is an exploded view of the motor rotor provided in an embodiment of this utility model;

[0023] Figure 3 This is a side view of the motor rotor provided in an embodiment of the present utility model;

[0024] Figure 4 This is a schematic diagram of the motor rotor structure excluding the fan blades provided in this embodiment of the utility model;

[0025] Figure 5 This is a front view of the main module provided in this embodiment of the utility model;

[0026] Figure 6 yes Figure 5 A magnified view of part A in the image.

[0027] In the picture:

[0028] X. Work direction;

[0029] 100. Main module; 110. Rotor back iron; 111. Ventilation hole; 112. Shaft hole; 120. First permanent magnet; 130. Second permanent magnet; 140. Third permanent magnet; 150. Heat spreader;

[0030] 200, Shaft module; 210, Input shaft; 220, Second positioning key; 230, Locking retaining ring;

[0031] 300. Fan blades. Detailed Implementation

[0032] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0033] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions. Moreover, "above," "on top of," and "over" the first feature in relation to the second feature includes the first feature directly above and diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "under," and "below" the first feature in relation to the second feature includes the first feature directly below and diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0034] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to 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 utility model based on the specific circumstances.

[0035] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0036] like Figures 1 to 6As shown, this utility model provides a motor rotor, including a shaft module 200, a main body module 100, and fan blades 300. The main body module 100 is arranged along the working direction X and includes a rotor back iron 110, multiple heat spreaders 150, and multiple Halebeck arrays. The rotor back iron 110 has a shaft hole 112 extending along the working direction X and ventilation holes 111. The shaft module 200 passes through the shaft hole 112. The number of ventilation holes 111 is the same as the number of heat spreaders 150. Each ventilation hole 111 has a heat spreader 150 embedded in its wall. All ventilation holes 111 are evenly spaced around the axis of the rotating shaft hole 112. All Helbeck arrays are evenly spaced around the axis of the rotating shaft hole 112 and located outside the ventilation holes 111. The Helbeck arrays pass through the rotor back iron 110 and extend along the working direction X. The Helbeck array includes a first permanent magnet 120, two second permanent magnets 130, and two third permanent magnets 140. The first permanent magnet 120 is positioned... Between the two second permanent magnets 130, the first permanent magnet 120 and the two second permanent magnets 130 are evenly distributed around the axis of the rotating shaft hole 112. The magnetization direction of the first permanent magnet 120 is radially away from the rotating shaft hole 112, and the magnetization direction of the second permanent magnets 130 is radially closer to the rotating shaft hole 112. Each third permanent magnet 140 is disposed between the first permanent magnet 120 and one second permanent magnet 130, in a direction away from the rotating shaft hole 112. The width direction of the third permanent magnet 140 gradually approaches the first permanent magnet 120, and the magnetization direction of the third permanent magnet 140 approaches the first permanent magnet 120 along the thickness direction of the third permanent magnet 140. There are two fan blades 300, which are located at both ends of the main body module 100. The shaft module 200 is coaxially connected to the fan blades 300. One fan blade 300 is used to guide gas into one end of the ventilation hole 111, and the other fan blade 300 is used to guide gas out from the other end of the ventilation hole 111.

[0037] The motor rotor forms an active and efficient heat dissipation circuit by embedding a heat spreader 150 within the ventilation holes 111 of the rotor back iron 110 and setting coaxially driven fan blades 300 at both ends of the main module 100. The fan blades 300 at one end guide cool air into the ventilation holes 111, while the fan blades 300 at the other end extract the hot air that has absorbed heat, forcing airflow across the surface of the heat spreader 150. The heat spreader 150 utilizes the phase change principle of its internal working fluid, possessing an extremely high equivalent thermal conductivity, enabling it to rapidly transfer the heat generated inside the motor rotor to the wall of the ventilation holes 111, where it is then carried away by the forced convection air. This combined heat dissipation mechanism of phase change conduction and forced convection helps achieve efficient heat dissipation synergy, effectively solving the problem of narrow air gaps and heat accumulation in magnetic field-modulated motors. Simultaneously, the ventilation holes 111 on the rotor back iron 110 reduce the magnetic cross-sectional area of ​​the motor rotor, leading to a decrease in torque density. This is compensated for by using a Heilbeck array with a specific arrangement and magnetization direction on the outside of the ventilation holes 111. The Hellbeck array, through its unique magnetization layout, guides and converges the originally radially or parallel magnetized magnetic lines of force to the air gap side, significantly improving the air gap magnetic flux density. Therefore, this structure can offset or even compensate for the torque loss caused by the ventilation holes 111, ensuring that the motor maintains high torque density output while achieving high heat dissipation efficiency, meeting the demands of high-torque operating conditions. Furthermore, the heat spreader 150, ventilation holes 111, and Hellbeck array are all integrated onto the rotor back iron 110 and are evenly spaced circumferentially, ensuring the dynamic balance characteristics of the motor rotor. The fan blades 300 are coaxially connected to the shaft module 200, driven by the motor's own rotation, requiring no additional power source, resulting in a compact and reliable structure.

[0038] In this embodiment, the gas flow direction within the motor rotor is as follows: Figure 3 As shown.

[0039] Continue to refer to Figures 1 to 6 The heat spreader 150 is in contact with the side of the ventilation hole 111 away from the shaft hole 112.

[0040] Since the side of the ventilation hole 111 furthest from the shaft hole 112 is closer to the outer circumference of the rotor back iron 110, and the Halebec array and motor air gap are the main heat sources, attaching the heat spreader 150 to this side hole wall is equivalent to placing the highly efficient heat dissipation element directly at the position closest to the heat source. This greatly shortens the heat conduction path, reduces thermal resistance, and allows the heat generated inside the motor rotor to be absorbed by the heat spreader 150 and begin phase change heat transfer as quickly as possible, further improving the immediacy of the heat dissipation response and overall efficiency.

[0041] Furthermore, the cross-section of the ventilation hole 111 is a fan ring, the cross-section of the heat spreader 150 is U-shaped, the middle part of the heat spreader 150 is in contact with the outer arc surface of the ventilation hole 111, and the two sides of the heat spreader 150 are each in contact with one straight edge surface of the ventilation hole 111.

[0042] The planar heat spreader 150 is designed in a U-shape, simultaneously conforming to the outer arc surface and two straight edges of the ventilation hole 111, significantly increasing the contact area between the heat spreader 150 and the rotor back iron 110. A larger contact area means more efficient heat transfer, enabling faster transfer of heat accumulated in the rotor back iron 110 to the heat spreader 150. Simultaneously, the multi-faceted conformity between the U-shaped cross-section and the annular ventilation hole 111 provides better support and restraint for the heat spreader 150 under the immense centrifugal force generated by the high-speed rotation of the motor rotor, preventing it from detaching or shifting, thus improving the reliability and structural stability of the motor during high-speed operation.

[0043] In this embodiment, the number of ventilation holes 111 is the same as that of the Hellbeck array, and the center of the ventilation hole 111 corresponds one-to-one with the center of the Hellbeck array in the radial direction of the pivot hole 112.

[0044] By aligning each vent 111 radially with each Hellbeck array, optimized coupling of the heat dissipation structure and the magnetic circuit structure is achieved. The heat generated by each Hellbeck array can be directly transferred radially to the heat spreader 150 within its corresponding vent 111. This one-to-one correspondence avoids lateral heat diffusion within the motor rotor, achieving heat partitioning for precise and rapid heat dissipation. This minimizes the heat dissipation path, maximizes efficiency, and also helps maintain the uniformity of the motor rotor's circumferential temperature and magnetic properties.

[0045] For example, the shaft module 200 includes an input shaft 210 and a first positioning key and two second positioning keys 220 embedded on the input shaft 210. The rotor back iron 110 is circumferentially positioned and connected to the input shaft 210 through the first positioning key, and each fan blade 300 is circumferentially positioned and connected to the input shaft 210 through a second positioning key 220.

[0046] By using independent first and second positioning keys 220, precise circumferential positioning between the rotor back iron 110 and the two fan blades 300 and the input shaft 210 is ensured. This is crucial for ensuring the alignment of the fan blades 300 with the ventilation holes 111, ensuring that one fan blade 300 can accurately force airflow into the ventilation hole 111, and the other fan blade 300 can efficiently extract airflow from the other end of the ventilation hole 111, forming a smooth airflow path. Simultaneously, the keyed connection has a strong torque-bearing capacity, is reliable and durable, and is suitable for harsh operating environments with high torque and high speed.

[0047] Furthermore, the input shaft 210 is a stepped shaft with a larger outer diameter in the middle section and a smaller outer diameter at both ends. The rotor back iron 110 is sleeved on the middle section of the input shaft 210. The shaft module 200 also includes two locking rings 230, which are sleeved on the input shaft 210 and are used to axially fix the fan blades 300.

[0048] The design employs a stepped shaft with a thicker middle section and thinner ends. The middle section provides a precise axial positioning reference surface for the rotor back iron 110, while the thicker shaft section helps to bear the weight of the motor rotor and transmit large torques. The thinner shaft sections at both ends facilitate the installation of the fan blades 300. This structure is compact and provides precise positioning. Furthermore, the use of locking retaining rings 230 to fix the fan blades 300 achieves a simple, effective, and space-saving axial fixation. This prevents the fan blades 300 from axially shifting under high-speed rotation and axial airflow impact, ensuring a constant axial clearance between the fan blades 300 and the ends of the rotor back iron 110, thereby maintaining stable ventilation and operational safety.

[0049] In this embodiment, the heat spreader 150 is attached to the ventilation hole 111 by applying a thin layer of epoxy resin adhesive.

[0050] The use of thin-coat epoxy resin adhesive offers several advantages. Firstly, the epoxy resin adhesive has high bonding strength, firmly fixing the heat spreader 150 within the ventilation hole 111 and resisting centrifugal force. Secondly, while ensuring bonding strength, the thin coating minimizes the contact thermal resistance caused by the adhesive layer, ensuring a good heat conduction path between the heat spreader 150 and the rotor back iron 110. This fixing method is simple, low-cost, and does not damage the heat spreader 150 or the rotor back iron 110.

[0051] For example, the rotor back iron 110 is a cylinder, and the axis of the rotor back iron 110 coincides with the axis of the shaft hole 112.

[0052] A cylinder is the most conventional and balanced shape for rotating machinery, which helps ensure the dynamic balance of the motor rotor during high-speed rotation and reduces wind resistance and vibration noise. At the same time, ensuring that the axis of the rotor back iron 110 coincides with the axis of the shaft hole 112 is a basic requirement for precision machining and assembly. This ensures the overall smoothness of the motor rotor's rotation, avoids additional centrifugal force and unbalanced magnetic pull caused by eccentricity, and improves the stability and lifespan of the motor operation.

[0053] In this embodiment, the first permanent magnet 120, the second permanent magnet 130, and the third permanent magnet 140 are all rectangular parallelepipeds.

[0054] Rectangular permanent magnets are the easiest shape of magnet to produce, procure, and process in industry, offering advantages such as low cost, easily guaranteed dimensional accuracy, and easy control of magnetization direction. By using standardized rectangular magnetic blocks and cleverly arranging and magnetizing them, a magnetizing effect is achieved. Compared to using irregularly shaped magnets, this significantly reduces the manufacturing cost and process difficulty of the motor, improving the industrialization and economic viability of the solution.

[0055] This embodiment also provides a motor, including a housing and the aforementioned motor rotor. The motor rotor is disposed inside the housing, and the end of the shaft module 200 is rotatably connected to the housing.

[0056] The motor's housing, rotor, and fan blades 300 work together to form a closed or semi-closed airflow system that allows air to enter from one end of the motor, flow through ventilation holes 111, and exit from the other end. This optimizes the organization of cooling airflow, avoids short-circuiting or turbulence, and improves the overall efficiency of the heat dissipation system. This motor solves the long-standing heat dissipation problem of magnetic field modulation motors while maintaining high torque density. It is particularly suitable for applications with confined spaces, difficult heat dissipation, and extremely high torque density requirements, giving it a significant competitive advantage and promising application prospects.

[0057] In this embodiment, the aforementioned motor is applied to locations such as the wheel hub and gearbox of a new energy vehicle.

[0058] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. An electric motor rotor, characterized in that, include: Shaft module (200); A main module (100) is arranged along the working direction (X). The main module (100) includes a rotor back iron (110), multiple heat spreaders (150), and multiple Halebec arrays. The rotor back iron (110) has a shaft hole (112) extending along the working direction (X) and a ventilation hole (111). The shaft module (200) passes through the shaft hole (112). The number of ventilation holes (111) is the same as that of the heat spreaders (150), and each ventilation hole... Each of the holes (111) has a heat spreader (150) embedded in its wall. All the ventilation holes (111) are evenly spaced around the axis of the shaft hole (112). All the Helbeck arrays are evenly spaced around the axis of the shaft hole (112) and located outside the ventilation holes (111). The Helbeck arrays pass through the rotor back iron (110) and extend along the working direction (X). The Helbeck arrays include a first permanent magnet (120) and two second permanent magnets (120). A magnet (130) and two third permanent magnets (140), wherein a first permanent magnet (120) is located between the two second permanent magnets (130), the first permanent magnet (120) and the two second permanent magnets (130) are evenly spaced around the axis of the rotating shaft hole (112), the magnetization direction of the first permanent magnet (120) is radially away from the rotating shaft hole (112), and the magnetization direction of the second permanent magnets (130) is radially away from the rotating shaft hole (112). 12) The radial direction of the third permanent magnet (140) is close to the pivot hole (112). Each of the third permanent magnets (140) is disposed between the first permanent magnet (120) and a second permanent magnet (130). In the direction away from the pivot hole (112), the width direction of the third permanent magnet (140) gradually approaches the first permanent magnet (120), and the magnetization direction of the third permanent magnet (140) is close to the first permanent magnet (120) along the thickness direction of the third permanent magnet (140). Two fan blades (300) are provided and located at both ends of the main body module (100). The shaft module (200) is coaxially connected to the fan blades (300). One fan blade (300) is used to guide gas into one end of the ventilation hole (111), and the other fan blade (300) is used to guide the gas out from the other end of the ventilation hole (111).

2. The motor rotor according to claim 1, characterized in that, The heat spreader (150) is in contact with the side of the ventilation hole (111) away from the shaft hole (112).

3. The motor rotor according to claim 2, characterized in that, The cross-section of the ventilation hole (111) is a fan ring, the cross-section of the heat spreader (150) is U-shaped, the middle part of the heat spreader (150) is in contact with the outer arc surface of the ventilation hole (111), and the two sides of the heat spreader (150) are in contact with one straight edge of the ventilation hole (111).

4. The motor rotor according to claim 1, characterized in that, The number of ventilation holes (111) is the same as that of the Heilbeck array, and the center of the ventilation hole (111) corresponds one-to-one with the center of the Heilbeck array in the radial direction of the pivot hole (112).

5. The motor rotor according to claim 1, characterized in that, The shaft module (200) includes an input shaft (210) and a first positioning key and two second positioning keys (220) embedded on the input shaft (210). The rotor back iron (110) is circumferentially positioned and connected to the input shaft (210) through the first positioning key. Each fan blade (300) is circumferentially positioned and connected to the input shaft (210) through one of the second positioning keys (220).

6. The motor rotor according to claim 5, characterized in that, The input shaft (210) is a stepped shaft with a larger outer diameter in the middle section and a smaller outer diameter at both ends. The rotor back iron (110) is sleeved on the middle section of the input shaft (210). The shaft module (200) also includes two locking rings (230), which are sleeved on the input shaft (210) and are used to axially fix the fan blades (300).

7. The motor rotor according to claim 1, characterized in that, The heat spreader (150) is attached to the ventilation hole (111) by applying a thin layer of epoxy resin adhesive.

8. The motor rotor according to claim 1, characterized in that, The rotor back iron (110) is a cylinder, and the axis of the rotor back iron (110) coincides with the axis of the shaft hole (112).

9. The motor rotor according to any one of claims 1-8, characterized in that, The first permanent magnet (120), the second permanent magnet (130) and the third permanent magnet (140) are all rectangular parallelepipeds.

10. An electric motor, characterized in that, It includes a housing and a motor rotor as described in any one of claims 1-9, wherein the motor rotor is disposed within the housing and the end of the shaft module (200) is rotatably connected to the housing.

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