Large-torque and high-heat-dissipation axial magnetic flux motor and rotor manufacturing method

Abstract

The invention relates to the technical field of axial magnetic flux motors, and provides a large-torque and high-heat-dissipation axial magnetic flux motor and a rotor manufacturing method.The large-torque and high-heat-dissipation axial magnetic flux motor comprises a rotor assembly, a stator assembly and an outer shell, the rotor assembly is connected with the outer shell and can drive the outer shell to rotate, and the stator assembly is located on the inner side of the outer shell; the rotor assembly comprises a front rotor disc, a rear rotor disc, a front rotor iron core and a rear rotor iron core, permanent magnets I and permanent magnets II are annularly and uniformly arranged on the front rotor iron core and the rear rotor iron core respectively, a plurality of shaft sleeve paddles distributed in the circumferential direction are arranged on the front rotor iron core, and the permanent magnets I, the front rotor iron core and the shaft sleeve paddles are integrally arranged; the shaft sleeve paddles are coaxially connected with the main shaft, the front rotor iron core can drive the main shaft to rotate, and the main shaft is rotationally arranged on the stator assembly. According to the motor, larger torque output can be provided, and meanwhile, the overall weight of the device is reduced due to selection of high-strength and light-weight materials.

Description

Technical Field

[0001] The present invention relates to the technical field of axial flux motors, and particularly relates to an axial flux motor with high torque and high heat dissipation and a manufacturing method for a rotor thereof. Background Art

[0002] An axial flux motor, also known as a disk motor, has a flux path different from that of a conventional radial motor. Its air gap is planar, and the direction of the air gap magnetic field is parallel to the axis direction of the motor. The core technical advantage of the axial flux motor lies in that the rotating rotor is located on the side of the stator rather than inside the stator in terms of structure. As a result, the rotor has a larger diameter size. Since torque = force × lever arm, a higher torque output can be obtained under the action of the same force.

[0003] In the field of vertical takeoff and landing unmanned aerial vehicles, the motor is one of the core components, directly affecting the performance, stability and efficiency of the unmanned aerial vehicle. The requirements for the motor are more complex and strict than those of traditional unmanned aerial vehicles. The following are the main requirements for the motor of vertical takeoff and landing unmanned aerial vehicles: 1. High torque. During the vertical takeoff and landing stage, it is necessary to overcome gravity. The motor needs to provide high torque and sufficient lift under the conditions of low speed and high load. 2. Lightweight. While ensuring sufficient strength and durability, reducing the weight of the motor itself can improve the endurance time, load capacity and flight performance of the unmanned aerial vehicle.

[0004] Therefore, the axial flux motor can be applied to vertical takeoff and landing unmanned aerial vehicles. However, the current axial flux motor still has the problem of poor cooling effect, resulting in poor overall performance of the axial flux motor. And since the rotor core and the permanent magnet are generally assembled and connected, the rotor is easily damaged at high speeds, and the practicability is poor.

[0005] Therefore, an axial flux motor for unmanned aerial vehicles with high torque and high heat dissipation is proposed to solve the above-mentioned requirements and problems. Summary of the Invention

[0006] In view of the existing requirements and deficiencies in technology, the present invention develops an axial flux motor for unmanned aerial vehicles with high torque and high heat dissipation. The invention can blow air towards the stator assembly by means of the air guiding grooves, heat dissipation fins and the rotation of the side housing fan blades provided on the outer housing. At the same time, the shaft sleeve blades rotate to take out the hot air inside the motor, improving the cooling effect of the axial flux motor. At the same time, the hollow structure and the use of carbon fiber materials reduce the overall weight of the device, and the practicability is better.

[0007] To achieve the above object, the present invention is realized through the following technical solutions: An axial flux motor with high torque and high heat dissipation, comprising a rotor assembly, a stator assembly and a housing. The rotor assembly is connected to the housing and can drive the housing to rotate. The stator assembly is located inside the housing and has no contact with the housing. The rotor assembly includes a front rotor disc, a rear rotor disc, a front rotor core and a rear rotor core. Permanent magnet one and permanent magnet two are respectively circumferentially and evenly arranged on the front rotor core and the rear rotor core. A plurality of circumferentially distributed sleeve blades are arranged on the front rotor core. Permanent magnet one, the front rotor core and the sleeve blades are integrally arranged. The sleeve blades are coaxially connected to the main shaft. The front rotor core can drive the main shaft to rotate, and the main shaft is rotatably arranged on the stator assembly.

[0008] Preferably, the stator assembly includes a stator core and a stator core support. A plurality of groups of winding coils are circumferentially and spacedly arranged on both side surfaces of the stator core. The winding coils on both sides correspond to permanent magnet one and permanent magnet two respectively and there are air gaps between them. The stator core is coaxially connected to the main shaft through a bearing.

[0009] Preferably, both the front rotor disc and the rear rotor disc are arranged as annular discs, with a gas passage for ventilation left in the center. A plurality of corresponding mounting holes are circumferentially opened on the front rotor disc, the rear rotor disc, the front rotor core, the rear rotor core and the housing. The mounting holes can be bolted together. The front rotor disc and the front rotor core are coaxially arranged at one end of the housing, and the rear rotor disc and the rear rotor core are coaxially arranged at the other end of the housing. There are air gaps between the front rotor disc, the rear rotor disc and the stator core.

[0010] Preferably, a plurality of air guide grooves are circumferentially opened on the housing. A plurality of heat dissipation fins are circumferentially arranged on the housing outside the air guide grooves. The heat dissipation fins are coaxially connected to the housing. A plurality of inner fan blades are circumferentially and evenly arranged on the inner side of the housing. The inner fan blades are used to fan the stator assembly to accelerate air flow.

[0011] Preferably, it further includes a limit assembly, including a shaft elastic retaining ring one, a shaft elastic retaining ring two and positioning bolt holes. The diameters of the shaft elastic retaining ring one and the shaft elastic retaining ring two are not less than the outer diameters of the shaft of the sleeve blades and the fixed end of the bearing, and are respectively used to limit the sleeve blades and the bearing. A threaded hole is coaxially opened at one end of the main shaft connected to the sleeve blades for externally connecting the blades of a propeller.

[0012] Preferably, the blades on the sleeve blades are all inclined, and when rotating, the air flow can be made to flow from the stator core towards the front rotor core direction to take out the internal heat.

[0013] Preferably, it further includes an optical encoder, which is coaxially arranged on the main shaft, and a shaft elastic retaining ring two is coaxially arranged on the main shaft between the optical encoder and the bearing for limiting the bearing.

[0014] Preferably, the front rotor core, the rear rotor core, and the stator core all adopt a hollow structure. The stator core is coaxially connected to the main shaft through a stator support and a bearing. The front rotor core is supported by a sleeve blade and coaxially arranged on the main shaft. The front rotor disk is connected to the front rotor core by bolts. The outer housing and the rear rotor disk are connected to the front rotor disk by bolts. The rear rotor core is arranged on the rear rotor disk by bolts.

[0015] Preferably, the front rotor disk, the sleeve blade, the main shaft, the stator support, the inner fan blade, the heat dissipation fins, and the rear rotor disk all adopt carbon fiber materials.

[0016] The present invention also provides a method for manufacturing a rotor of an axial flux motor for manufacturing the rotor of the above-mentioned axial flux motor, including the following steps: Step 1: Mix neodymium iron boron magnetic powder and resin material in a volume ratio of 7:3, and then add 1% by weight of short-cut carbon fiber filaments to the mixture. Disperse the mixture of neodymium iron boron magnetic powder, resin material, and short-cut carbon fiber filaments in a solvent by stirring or ultrasonic treatment to obtain a uniformly mixed slurry. Step 2: Remove the solvent in the uniformly mixed slurry to obtain a uniformly mixed mixture. Step 3: Preheat the rotor mold. Lay a layer of glass fiber prepreg on the inner side of the lower mold of the rotor mold, then lay a layer of carbon fiber prepreg on the glass fiber prepreg, then place sandwich materials at the positions corresponding to the formation of the sleeve blades on the lower mold on the carbon fiber prepreg, lay SMC soft magnetic materials at the positions corresponding to the formation of the front rotor core on the lower mold on the carbon fiber prepreg, lay a mixture of neodymium iron boron magnetic powder, resin material, and short-cut carbon fiber filaments at the positions where the permanent magnet one is formed, then lay a layer of carbon fiber prepreg on the sandwich materials and the mixture, then lay a layer of glass fiber prepreg, and finally connect the upper mold and the lower mold. Step 4: Perform heating and pressure curing, and keep the pressure until it cools and forms, then demold.

[0017] The effects provided in the summary of the invention are only the effects of the embodiments, rather than all the effects of the invention. The above technical solutions have the following advantages: In the present invention, by providing air guiding grooves and inner fan blades on the outer casing, when the outer casing rotates, the air flow passes through the air guiding grooves and is guided by the inner fan blades to blow towards the stator and the winding coils. At the same time, sleeve blades are provided between the front rotor core and the main shaft, so that during the rotation process of the sleeve blades, the hot air inside the motor is taken out, and the heat on the stator assembly is removed, achieving a better cooling effect and providing partial lift for the drone; a number of heat dissipation fins are evenly distributed on the outer circumference of the outer casing, increasing the contact area of the outer casing and improving the heat dissipation effect on the surface of the motor; by using carbon fiber material as the material for the main structures such as the outer casing, the front rotor disc, and the rear rotor disc, while ensuring the overall strength of the motor, the overall weight is greatly reduced; the front rotor core, the rear rotor core, the stator core, the front rotor disc, and the rear rotor disc are all provided with hollow structures, which are lighter in weight under the same mass density, increase the lever arm, and provide space for air circulation; by setting the sleeve blades, the front rotor core, and the permanent magnet into an integrated structure, the integrity is improved, the detachment of the permanent magnet from the front rotor core during too fast rotation is avoided, and the safety and stability are better. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings are used to provide further understanding of the present invention, and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation to the present invention.

[0019] Figure 1 is a schematic diagram of the overall structure of an embodiment of the present invention; Figure 2 is a schematic sectional structure diagram of an embodiment of the present invention; Figure 3 is a schematic structure diagram of the outer casing, the front rotor disc, and the rear rotor disc of an embodiment of the present invention; Figure 4 is a partial exploded view of the rotor assembly and the stator assembly of an embodiment of the present invention; Figure 5 is a partial exploded view of the main shaft and its connections of an embodiment of the present invention.

[0020] In the figures, 1, mounting hole; 2, front rotor disc; 3, positioning bolt hole; 4, front rotor core; 5, permanent magnet 1; 6, sleeve blade; 7, shaft circlip 1; 8, threaded hole; 9, main shaft; 10, bearing; 11, shaft circlip 2; 12, photoelectric encoder; 13, winding coil; 14, stator support; 15, stator core; 16, inner fan blade; 17, outer casing; 18, air guiding groove; 19, heat dissipation fin; 20, permanent magnet 2; 21, rear rotor core; 22, rear rotor disc. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0022] Embodiment 1 As Figures 1 - 5 shown, an axial flux motor with high torque and high heat dissipation includes a rotor assembly, a stator assembly, and a housing 17. The rotor assembly is connected to the housing 17 and can drive the housing 17 to rotate. The stator assembly is located inside the housing 17 and has no contact with the housing 17 to avoid affecting the rotation of the housing 17. The rotor assembly includes a front rotor core 4, a rear rotor core 21, a front rotor disk 2, and a rear rotor disk 22. Both the front rotor core 4 and the rear rotor core 21 are hollow to facilitate gas flow. A plurality of first permanent magnets 5 and second permanent magnets 20 are respectively circumferentially and uniformly arranged on the sides of the front rotor core 4 and the rear rotor core 21 close to the stator assembly. Six circumferentially uniformly distributed sleeve blades 6 are arranged on the front rotor core 4. The sleeve blades 6 can provide a radial supporting force for the front rotor core 4, and the first permanent magnets 5, the front rotor core 4, and the sleeve blades 6 are integrally formed. The second permanent magnets 20 and the rear rotor core 21 are integrally formed. The sleeve blades 6 are coaxially connected to the main shaft 9 to enable the front rotor core 4 to drive the main shaft 9 to rotate. The main shaft 9 is coaxially rotatably arranged on the stator assembly.

[0023] In an alternative embodiment, the stator assembly includes a stator core 15. The stator core 15 is hollow to facilitate gas flow. A stator support 14 is arranged in the middle of the stator core 15. A plurality of groups of winding coils 13 are circumferentially spaced on both sides of the stator core 15 close to the front rotor core 4 and the rear rotor core 21. The winding coils 13 can be energized. The winding coils 13 correspond to the first permanent magnets 5 and the second permanent magnets 20 and there is an air gap between them. The stator support 14 in the middle of the stator core 15 is coaxially connected to the main shaft 9 through a bearing 10. The stator support 14 is used to support the stator core 15.

[0024] In an alternative embodiment, the rotor assembly further includes a front rotor disc 2 and a rear rotor disc 22, both of which are also provided as hollow annular discs with a gas passage for ventilation left in the center. A plurality of corresponding mounting holes 1 are circumferentially formed on the front rotor disc 2, the front rotor iron core 4, the rear rotor iron core 21, the outer housing 17, and the rear rotor disc 22. The corresponding mounting holes 1 can be bolted together. The front rotor disc 2 and the front rotor iron core 4 are coaxially arranged at one end of the outer housing 11, and the rear rotor disc 17 and the rear rotor iron core 21 are coaxially arranged at the other end of the outer housing 11. An air gap is left between the front rotor disc 2 and the rear rotor disc 22 and the stator iron core 15, which facilitates rapid cooling.

[0025] In an alternative embodiment, a plurality of air guiding grooves 18 are circumferentially and uniformly formed on the outer housing 17. The length directions of the air guiding grooves 18 are all parallel to the axis of the outer housing 17, and the length of the air guiding grooves 18 is greater than the thickness of the stator assembly, so that when the motor rotates, the maximum amount of air blows towards the stator iron core 15 and the winding coil 13. A plurality of axially and uniformly arranged heat dissipation fins 19 are circumferentially arranged on the outer housing 17 outside the air guiding grooves 18. The heat dissipation fins 19 are coaxially connected to the outer housing 17 and are used to increase the contact area with the external air of the device, thereby accelerating the heat dissipation speed and improving the cooling efficiency.

[0026] In an alternative embodiment, a limit assembly is further included, which includes a shaft elastic retaining ring one 7, a shaft elastic retaining ring two 11, and a positioning bolt hole 3. The diameter of the shaft elastic retaining ring one 7 is not less than the outer diameter of the shaft of the shaft sleeve blade 6, and the diameter of the shaft elastic retaining ring two 11 is not less than the outer diameter of the shaft of the fixed end of the bearing 10, so as to limit the shaft sleeve blade 6 and the bearing 10 respectively. A threaded hole 8 is coaxially formed at one end of the main shaft 9 connected to the shaft sleeve blade 6 for connecting with the large propeller blade of the drone.

[0027] In an alternative embodiment, the blades on the shaft sleeve blade 6 are all inclined in the same direction, which is used to blow air from the stator iron core 15 towards the front rotor iron core 4 when rotating, or to blow air from the stator iron core 15 towards the rear rotor iron core 21 when rotating. Preferably, the inclination angle of the blades is between 30° and 45°.

[0028] In an alternative embodiment, a photoelectric encoder 12 is further included, which is used for position detection during the rotation of the permanent magnet one 5 and the permanent magnet two 20 and for controlling the energization frequency of the winding coil 13. The photoelectric encoder 12 is coaxially arranged on the main shaft 9, and a shaft elastic retaining ring two 11 is coaxially arranged on the main shaft 9 between the photoelectric encoder 12 and the bearing 10, which is used to limit the position of the bearing 10 and prevent the main shaft 9 from falling off, with better safety.

[0029] In an alternative embodiment, the front rotor disk 2, the sleeve blade 6, the main shaft 9, the stator support 14, the inner fan blade 16, the outer housing 17, the heat dissipation fin 19, and the rear rotor disk 22 are all made of composite carbon fiber material. Preferably, T300 carbon fiber material is selected, with a density of 1.76 g / cm³ and a tensile strength of 3500 Mpa, which is more economical under the premise of meeting the use requirements.

[0030] Working principle: First, when the motor starts, the electrical control system such as the photoelectric encoder 12 supplies power to the motor through a contactor. When current flows through the stator winding coil 13, an electric current magnetic field is generated. This magnetic field interacts with the magnetic fields applied by the permanent magnet one 5 and the permanent magnet two 20 in the motor to generate a combined attractive or repulsive force, thereby driving the front rotor core 4 and the rear rotor core 21 of the motor to rotate in the same direction simultaneously. The permanent magnet one 5, the permanent magnet two 20, and the winding coil 13 of this motor are arranged in a circular pattern and correspond one by one. In this way, the axial magnetic flux will always act together with the attractive or repulsive force, enabling the motor to operate stably and efficiently. Secondly, during the rotation of the motor, the front rotor core 4 drives the sleeve blade 6 to rotate, generating suction and pushing the airflow from the stator core 15 towards the front rotor core 4. At the same time, under the action of the wind pressure, the external airflow of the motor outer housing 17 is guided through the housing air guide groove 18 and the inner fan blade 16 and blows towards the stator core 15 and the winding coil 13, forming an air-cooling effect to take away the heat generated by the energization of the winding coil 13. At the same time, after the motor is fixed on the drone, the end of the sleeve blade 6 faces the ground, driving the airflow to generate a force, and under the reaction of the force, providing part of the thrust for the drone, and the remaining thrust is provided by the external propeller.

[0031] Embodiment Two A method for manufacturing the rotor of an axial flux motor, used to manufacture the rotor of the above-mentioned axial flux motor, includes the following steps: Step One: Mix neodymium iron boron magnetic powder and resin material in a volume ratio of 7:3. The resin material is selected as phenolic resin, and then 1% by weight of short carbon fiber filaments is added to the mixture, which strengthens the strength and stiffness of the material with almost no impact on the magnetic properties. Disperse the mixture of neodymium iron boron magnetic powder, phenolic resin material, and short carbon fiber filaments in a methanol solvent with a weight ratio of 40% through stirring or ultrasonic treatment to obtain a uniformly mixed slurry. Step Two: Remove the solvent in the uniformly mixed slurry to obtain a uniformly mixed mixture. Specifically, spread the mixture in a stainless steel tray into a 4-mm-thick thin layer, heat it in a fume hood at 50 °C for 30 minutes, and then transfer it to a vacuum drying oven at 70 °C and place it for 2 hours to deeply remove methanol. Step 3: Preheat the rotor mold to 60°C. Lay a layer of fiberglass prepreg on the inner side of the lower mold of the rotor mold. The fiberglass prepreg is impregnated with phenolic resin, and the phenolic resin accounts for 35% by volume. Then lay a layer of carbon fiber prepreg on the fiberglass prepreg. The carbon fiber cloth is an ammonia-catalyzed phenolic twill cloth, and the phenolic resin accounts for 40% by volume. Then place sandwich materials at the positions corresponding to the blade forming on the lower mold on the carbon fiber prepreg. The sandwich materials are PMI foam (polymethacrylimide) cut according to the blade shape, which is light in weight, has a temperature resistance higher than 180°C, and a pressure resistance higher than 10 Mpa. Lay SMC soft magnetic material at the positions corresponding to the rotor core on the lower mold on the carbon fiber prepreg. The SMC is spherical or near-spherical atomized iron powder. The iron powder is dried and dehumidified and evenly mixed with the insulating coating. Lay a mixture of neodymium iron boron magnetic powder, resin material, and short carbon fiber filaments at the positions where the permanent magnet is formed. Then lay another layer of carbon fiber prepreg on the sandwich materials and the mixture, and then lay another layer of fiberglass prepreg. Finally, connect the upper mold and the lower mold; Step 4: Conduct preheating. Set the preheating temperature to 80°C and the pressure to 1.5 Mpa and hold for 5 minutes. Then apply a magnetic field while heating and pressurizing for curing. Set the temperature for heating and pressurizing for curing to 160°C and the pressure to 15 Mpa and hold for 30 minutes. Apply an axial magnetic field of 2.0 T at 110°C to magnetize the neodymium iron boron magnetic powder. Then hold the pressure and wait for natural cooling to 60°C. After molding, demold and take out the integrated blade and rotor.

[0032] The experimental test items and data examples of the above rotor manufacturing method are as follows: Magnetic property experiment Traditional silicon steel sheets have high high-frequency losses. The insulating characteristics of SMC materials significantly reduce eddy current losses. During the load test, due to the difference in eddy current losses, the comprehensive efficiency of the above SMC + neodymium iron boron integrally formed motor is 2% - 3% higher than that of the traditional assembly. At the same time, the core and the magnet are integrally formed, reducing the air gap and increasing the air gap magnetic density.

[0033] Environmental tolerance experiment Temperature rise experiment The above axial flux motor with high torque and high heat dissipation has a structure with air guide grooves, heat dissipation fins, and inner fan blades on the outer shell, as well as an integrated structure of the front rotor and the sleeve blade, which greatly increases the heat dissipation efficiency of the motor. Under the same conditions, the temperature rise is significantly reduced. At the same time, the integrated structure reduces the number of parts and the assembly complexity, and can better meet the requirements of lightweight and integration of the UAV motor.

[0034] The details not elaborated in the present invention are all conventional technical means well-known to those skilled in the art.

[0035] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. are based on the orientation or positional relationships shown in the drawings. These are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0036] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality" means two or more, unless otherwise specifically defined.

[0037] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

[0038] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments or perform equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A high-torque, high-heat dissipation axial flux motor, comprising a rotor assembly, a stator assembly and an outer shell (17), characterized in that: The rotor assembly is connected to the outer shell (17) and can drive the outer shell (17) to rotate. The stator assembly is located inside the outer shell (17) and has no contact with the outer shell (17). The rotor assembly comprises a front rotor disk (2), a rear rotor disk (22), a front rotor core (4) and a rear rotor core (21). The front rotor core (4) and the rear rotor core (21) are respectively and evenly provided with a permanent magnet 1 (5) and a permanent magnet 2 (20) in an annular direction. The front rotor core (4) is provided with a plurality of circumferentially distributed shaft sleeve blades (6). The permanent magnet 1 (5), the front rotor core (4) and the shaft sleeve blades (6) are integrally provided. The shaft sleeve blades (6) are coaxially connected to a main shaft (9). The front rotor core (4) can drive the main shaft (9) to rotate. The main shaft (9) is rotatably provided on the stator assembly.

2. The high-torque, high-heat dissipation axial flux motor according to claim 1, characterized in that: The stator assembly comprises a stator core (15) and a stator core support (14). A plurality of groups of winding coils (13) are arranged circumferentially and spaced apart on both side surfaces of the stator core (15). The winding coils (13) on both sides correspond to the permanent magnet 1 (5) and the permanent magnet 2 (20) respectively and an air gap is left between them. The stator core (15) is coaxially connected to the main shaft (9) through a bearing (10).

3. The high-torque, high-heat dissipation axial flux motor according to claim 2, characterized in that: The front rotor disk (2) and the rear rotor disk (22) are both arranged as annular disks, with a gas passage for ventilation in the center. A plurality of corresponding mounting holes (1) are circumferentially arranged on the front rotor disk (2), the rear rotor disk (22), the front rotor core (4), the rear rotor core (21) and the outer shell (17). The mounting holes (1) can be connected by bolts. The front rotor disk (2) and the front rotor core (4) are coaxially arranged at one end of the outer shell (17), and the rear rotor disk (22) and the rear rotor core (21) are coaxially arranged at the other end of the outer shell (17). An air gap is reserved between the front rotor disk (2), the rear rotor disk (22) and the stator core (15).

4. The high-torque, high-heat dissipation axial flux motor according to claim 3, characterized in that: A plurality of air guide grooves (18) are circumferentially provided on the outer shell (17), a plurality of heat dissipation fins (19) are circumferentially provided on the outer shell (17) outside the air guide grooves (18), the heat dissipation fins (19) are coaxially connected to the outer shell (17), a plurality of inner fan blades (16) are evenly provided circumferentially on the inner side of the outer shell (17), and the inner fan blades (16) are used to fan the stator assembly to accelerate air flow.

5. The high-torque, high-heat dissipation axial flux motor according to claim 4, characterized in that: The invention also comprises a limiting assembly, comprising a first shaft elastic retaining ring (7), a second shaft elastic retaining ring (11) and a positioning bolt hole (3). The diameters of the first shaft elastic retaining ring (7) and the second shaft elastic retaining ring (11) are not less than the outer diameter of the shaft at the fixed end of the shaft sleeve blade (6) and the bearing (10), and are respectively used to limit the shaft sleeve blade (6) and the bearing (10). A threaded hole (8) is coaxially provided on one end of the main shaft (9) connected to the shaft sleeve blade (6) for connecting the blade of an external propeller.

6. The high-torque, high-heat dissipation axial flux motor according to claim 5, characterized in that: The blades on the shaft sleeve blades (6) are all arranged at an angle, so that when rotating, the airflow can flow from the stator core (15) to the outside, thereby removing the internal heat.

7. The high-torque, high-heat dissipation axial flux motor according to claim 6, characterized in that: It also includes a photoelectric encoder (12) coaxially arranged on the main shaft (9), and a second shaft elastic retaining ring (11) coaxially arranged on the main shaft (9) between the photoelectric encoder (12) and the bearing (10) for limiting the position of the bearing (10).

8. A high torque, high heat dissipation shaft flux motor according to claim 7, characterized in that: The front rotor core (4), the rear rotor core (21), and the stator core (15) all adopt a hollow structure. The stator core (15) is coaxially connected to the main shaft (9) through a stator support (14) and a bearing (10). The front rotor core (4) is supported by a sleeve blade (6) and is coaxially arranged on the main shaft (9). The front rotor disk (2) is connected to the front rotor core (4) through bolts. The outer shell (17) and the rear rotor disk (22) are connected to the front rotor disk (2) through bolts. The rear rotor core (21) is arranged on the rear rotor disk (22) through bolts.

9. The high-torque, high-heat dissipation axial flux motor according to claim 8, characterized in that: The front rotor disk (2), the shaft sleeve blades (6), the main shaft (9), the stator support (14), the inner fan blades (16), the heat dissipation fins (19) and the rear rotor disk (22) are all made of carbon fiber material.

10. A method for manufacturing a rotor of an axial flux motor, used for manufacturing the rotor of the axial flux motor according to claim 8, characterized in that: The following steps are involved: Step 1: NdFeB magnetic powder and resin material are mixed in a volume ratio of 7:3, and then 1% by weight of chopped carbon fiber filaments are added to the mixture, and the mixture of NdFeB magnetic powder, resin material and chopped carbon fiber filaments is dispersed in a solvent by stirring or ultrasonic treatment to obtain a uniformly mixed slurry; Step 2: removing the solvent in the uniformly mixed slurry to obtain a uniformly mixed mixture; Step 3: Preheat the rotor mold, lay a layer of glass fiber prepreg on the inner side of the lower mold of the rotor mold, and then lay a layer of carbon fiber prepreg on the glass fiber prepreg, and then place the sandwich material on the carbon fiber prepreg at the position corresponding to the sleeve blade forming position on the lower mold, lay SMC soft magnetic material on the carbon fiber prepreg at the position corresponding to the front rotor core forming position on the lower mold, lay NdFeB magnetic powder, resin material and chopped carbon fiber yarn mixture at the position where the permanent magnet is formed, and then lay a layer of carbon fiber prepreg on the sandwich material and the mixture, and then lay a layer of glass fiber prepreg, and finally connect the upper mold with the lower mold; Step 4: Heat and pressurize to solidify, and maintain pressure to wait for cooling and molding before demoulding.

Images