Hub motor with ceramic oil cooling structure

Abstract

The utility model relates to a hub motor with a ceramic oil cooling structure. The hub motor comprises a stator with a ceramic structure, an outer rotor, a central shaft and a casing. Ceramic stripes are arranged on the surface of a stator iron core silicon steel sheet, a ceramic coating is adopted on the conductor surface of a stator coil, the stator iron core and the coil are packaged by adopting a soft magnetic composite material box body, and the iron core and the coil in the soft magnetic composite material box body are subjected to circulating oil cooling by utilizing ceramic pores. A carbon nanotube-ceramic composite material pore air cooling structure is adopted around a permanent magnet on the outer rotor, and an oil cooling channel and an air cooling channel are arranged by utilizing a central shaft. The oil cooling channel is provided with a cooling heat dissipation pipe outside the machine, and the vehicle-mounted air conditioner provides air cooling gas into the machine. According to the utility model, the cooling channel with a nano structure is adopted, and uniform heat dissipation is realized, so that the function of the hub motor is improved.

Description

Technical Field

[0001] The utility model relates to a wheel hub motor cooling structure, in particular to a wheel hub motor with a ceramic oil cooling structure. Background Art

[0002] The life of the hub motor mainly depends on the life of the insulation material. For every 10°C increase in the temperature of the motor insulation structure, the expected life will be shortened by half. Therefore, improving the heat resistance and thermal conductivity of the insulation structure has become one of the urgent problems to be solved in the hub motor. The stator winding and iron core of the hub motor generate a lot of heat, and the heat generated by the winding and iron core is difficult to transfer through the insulation layer. Most polymer materials do not have good thermal conductivity, while ceramics as insulation materials have the advantages of thin insulation layer, heat resistance and good thermal conductivity. Therefore, it is necessary to develop polymer-ceramic composite materials to improve the thermal conductivity of the motor.

[0003] The eddy current loss generated by soft magnetic composite materials is much lower than that generated by laminated silicon steel sheets. Soft magnetic composite materials have lower coercive force and magnetic loss, as well as higher saturation magnetization, resistivity and permeability, and can be directly pressed into the desired shape in different molds. In order to reduce the heat loss caused by eddy current, soft magnetic composite materials can be prepared to replace silicon steel sheets. Soft magnetic composite materials are prepared by adding a layer of insulating medium on the surface of magnetic materials. At present, the most widely used soft magnetic material is the alloy with the grade of 1J22 in the Fe-Co series. The saturation magnetization of the alloy can reach 2.4T, the initial magnetic permeability is 1000, the maximum magnetic permeability is as high as 8000H / m, and the coercive force is less than 60A / m, which has broad application prospects. Another commonly used nanocrystalline alloy is a nanocrystalline alloy with FeSiB amorphous alloy as the matrix, a small amount of copper, tungsten, etc. added to it, and a high magnetic permeability and high saturation magnetization are obtained by heat treatment at an appropriate temperature.

[0004] The highest temperature of the hub motor is located in the middle of the stator slot, and the heat is difficult to dissipate. During the operation of the motor, the enameled wire is difficult to dissipate heat, and the winding will continue to heat up; the core laminations are subjected to the long-term effects of electrical, magnetic, thermal, and mechanical forces, and the insulation between the laminations is damaged, and the slot insulation is destroyed, resulting in motor damage. To solve the heat dissipation problem of the stator, polymer-ceramic composite materials can be introduced, nano-scale heat dissipation structures between stator windings and core laminations can be designed, and a box made of soft magnetic composite materials can be used to encapsulate the stator, and oil cooling can be used to dissipate heat to improve the performance of the hub motor.

[0005] Carbon nanotubes have good heat transfer properties and high heat exchange performance along the length direction, which can optimize the design of heat-conducting carbon nanotube-ceramic composite materials. As long as a small amount of carbon nanotubes is doped into the composite material, the thermal conductivity of the composite material will be greatly improved. Carbon nanotubes also have excellent mechanical properties: tensile strength of 50 to 200GPa, equivalent to 100 times that of steel, but the specific gravity is only one-sixth of that of steel, so they are called "super fibers". Carbon nanotube-ceramic composite materials are used in the air-cooled structure of the hub motor rotor, which has the advantages of good thermal conductivity, light weight and high strength.

[0006] Common cooling methods for hub motors include air cooling, water cooling, and oil cooling. Air cooling requires the addition of cooling structures such as heat dissipation ribs or fins, and the heat dissipation effect is poor. Water cooling and oil cooling have better effects. Oil cooling has a large thermal conductivity and high insulation strength. Transformer oil with a low viscosity coefficient can be used as a cooling medium to dissipate heat from the motor. Existing oil cooling directly injects heat transfer oil into the hub motor. During the operation of the motor, heat and pressure are generated due to friction, which will cause air and oil leakage at the sealed oil seal. Therefore, how to design the oil cooling structure to improve the cooling effect has become an urgent problem to be solved.

[0007] Chinese patents CN 220220390 U, CN 115276323 A and CN 220254265 U provide motors with several different cooling schemes.

[0008] CN 220220390 U discloses a liquid-cooled hub motor with high sealing performance. A cooling duct is arranged along the circumference of a stator bracket, the cooling duct and the bracket are integrally cast, and the cooling duct body comprises a plurality of annular structures and a partition structure connected in sequence; one end of the plurality of annular structures connected in sequence is connected to a liquid inlet, the other end is connected to the partition structure, and the liquid outlet is connected to the end of the partition structure. The liquid cooling structure has good sealing performance, but the cooling effect is limited.

[0009] CN 115276323 A discloses a single-bearing water-cooled hub motor, which forms a cooling cavity between the hub outer frame, the inner side of the cover and the motor outer frame and the outer side of the motor cover by setting a water cooling mechanism, and realizes continuous circulation of coolant in multiple circulation pipes and connecting pipes through a coolant circulation pump mechanism, and conducts heat dissipation of the stator assembly through the continuously circulating coolant. The water cooling mechanism can effectively dissipate heat, but the structure is relatively complex.

[0010] CN 220254265 U discloses a hybrid heat dissipation outer rotor hub motor, wherein the heat dissipation system comprises a heat pipe and a liquid cooling heat dissipation component, wherein the liquid cooling heat dissipation component is arranged on the rear end cover, the heat pipe is arranged in the wire embedding groove, and the heat pipe extends into the liquid cooling heat dissipation component; the heat pipe has a cavity inside, the tube core is distributed on the inner wall of the cavity, the tube core is a capillary mechanism and is distributed on the inner wall of the metal tube, and the working medium is a liquid medium. The heat dissipation system can directly dissipate heat from the winding, prevent heat accumulation, and improve heat dissipation efficiency. Utility Model Content

[0011] Based on this, the purpose of the utility model is to provide a hub motor with a ceramic oil cooling structure, wherein the stator core and coil are packaged in a soft magnetic composite material box, the stator core and coil in the soft magnetic composite material box are provided with a ceramic pore circulation oil cooling structure, and the permanent magnet on the outer rotor adopts a carbon nanotube-ceramic composite material pore air cooling structure. The utility model provides a technical solution to the heat dissipation problem of the hub motor, and meets the heat dissipation requirements of high-power hub motors.

[0012] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0013] A hub motor with a ceramic oil cooling structure, characterized in that: it comprises a stator with a ceramic oil cooling structure and an outer rotor with a carbon nanotube air cooling structure; the stator and the outer rotor form an axial magnetic flux closed loop; the stator is fixed on the central shaft, and the outer rotor is arranged on the outside of the stator and connected to the central shaft through a bearing; characterized in that:

[0014] The stator core adopts at least one of the following three ceramic oil-cooling structure models: (1) a silicon steel sheet stator core with ceramic stripes arranged on the surface of the silicon steel sheet, (2) a narrow silicon steel sheet stator core with pores arranged between the narrow silicon steel sheets, and (3) a soft magnetic composite material-honeycomb structure is adopted for the stator core.

[0015] The stator coil adopts at least one of the following two ceramic oil-cooling structure models: (1) a ceramic coating is provided on the conductor surface of the stator coil, (2) the stator coil adopts a honeycomb structure of soft magnetic composite material;

[0016] The stator core and the coil as a whole are packaged by a soft magnetic composite material box to form a stator box.

[0017] Furthermore, the stator is enclosed by a soft magnetic composite material box, a circulating oil inlet and a circulating oil outlet are arranged on the stator box, and the stator box is fixed on the main shaft. The soft magnetic composite material of the stator box adopts a 1J22 alloy and a resin composite material in the Fe-Co series, wherein the resin is an insulating coating material. Of course, it also includes the use of other soft magnetic composite materials or insulating coating materials, and the wall thickness of the soft magnetic composite material box is 2mm-10cm. The soft magnetic composite material has a high saturation magnetization intensity and can be directly pressed into the desired stator box shape. The soft magnetic composite material can improve the performance of the motor and reduce energy loss.

[0018] Furthermore, in the stator core model (1), ceramic coating is performed on the surface of the silicon steel sheet, including ceramic-resin composite material coating, the coating thickness is 30nm-100μm, and ceramic stripes are arranged at intervals, and the ceramic stripes include straight stripes and / or curved stripes; in the stator core model (2), the narrow silicon steel sheet width is set to 4-20mm, and pores are left between the narrow silicon steel sheets, and the pore width is 50nm-200μm, and then assembled into a stator core with an oil cooling structure; in the stator core model (3), the stator core adopts a soft magnetic composite honeycomb structure and is provided with pore oil cooling. The distributed heat dissipation structure is set by using ceramic pores-cooling oil to improve the insulation and heat dissipation effects.

[0019] Furthermore, in the model (1) of the stator coil, a ceramic coating is performed on the conductor surface of the stator coil, which also includes the use of ceramic-resin composite material coating, and the coating thickness is 8μm-400μm; in the model (2) of the stator coil, the stator coil adopts a soft magnetic composite honeycomb structure and is provided with oil cooling pores. The hub motor winding generates the most heat, and the thermal conductivity of the insulating material is low. The heat generated by the coil is difficult to transfer through the insulating layer. The stator coil is set as a ceramic pore oil cooling structure, which can improve the thermal conductivity of the motor.

[0020] Furthermore, the outer rotor includes a left rotor and a right rotor, the left rotor and the right rotor are both arranged on the outside of the stator case, and the outer rotor is connected to the central axis through a bearing; the left rotor and the right rotor are connected through a casing; the permanent magnets are both arranged on the inner sides of the left rotor and the right rotor, and the permanent magnets adopt a carbon nanotube-ceramic composite air-cooled connection structure.

[0021] Furthermore, the central shaft is provided with oil cooling and air cooling channels, the circulating oil inlet and outlet are connected to the heat dissipation pipeline outside the motor, and the casing is provided with an exhaust outlet.

[0022] Furthermore, a carbon nanotube-ceramic composite air-cooling structure is arranged around the permanent magnet, and a carbon nanotube-ceramic-resin composite material structure is also arranged, the carbon nanotube diameter is 16-100nm, and the composite air-cooling structure thickness is 5-20mm. By utilizing the ventilation cooling of the carbon nanotube holes, the carbon nanotubes can be synthesized into a highly anisotropic thermal conductive material. As long as a trace amount of carbon nanotubes is doped in the composite material, the thermal conductivity of the composite material will be greatly improved.

[0023] Furthermore, it also includes a vehicle air conditioner, wherein the vehicle air conditioner port is connected to the ventilation inlet of the central axis. Cooling gas is provided to the machine through the ventilation inlet to improve the cooling effect, and hot air is discharged to the outside through the exhaust outlet.

[0024] The beneficial effects of the utility model are mainly in five aspects: First, ceramic oil-cooling pores are set on the surface of the silicon steel sheet to distribute the heat and improve the heat dissipation effect. Second, a ceramic coating structure is adopted on the surface of the conductor in the stator coil, and its pores are used for air cooling, which can effectively reduce the temperature of the stator coil. Third, a soft magnetic composite material composed of 1J22 alloy and resin in the Fe-Co series is used to construct a magnetic sealing box outside the stator core and coil. The soft magnetic composite material can be pressed into the shape of the stator by a mold and has good sealing performance. Fourth, a carbon nanotube-ceramic composite air-cooling connection structure is set on the outer rotor permanent magnet. The carbon nanotube-ceramic composite material is used in the rotor air-cooling structure, which has the advantages of good thermal conductivity, light weight and high strength. Fifth, the hub motor with a ceramic oil-cooling structure utilizes the above-mentioned composite material with good thermal conductivity and adopts a nanostructured cooling channel to dissipate heat quickly and improve the performance of the motor.

[0025] In order to better understand and implement the present invention, the present invention is described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic diagram of a hub motor structure with a ceramic oil cooling structure;

[0027] Figure 2 Schematic diagram of stator core structure;

[0028] Figure 3 Schematic diagram of stator coil structure;

[0029] Figure 4 Schematic diagram of permanent magnet structure;

[0030] Figure 5 Schematic diagram of the soft magnetic composite material box;

[0031] Figure numerals: 1-central axis; 2-left rotor; 3-permanent magnet; 4-stator coil; 5-stator core; 6-ceramic coating; 7-ceramic stripes; 8-soft magnetic composite material stator housing; 9-right rotor; 10-carbon nanotube-ceramic composite material air-cooling structure; 11-oil cooling pores; 12 circulating oil inlet; 13-circulating oil outlet; 14-ventilation inlet; 15-casing; 16-exhaust outlet; 17-bearing; DETAILED DESCRIPTION

[0032] like Figure 1 As shown, a hub motor with a ceramic oil cooling structure comprises a stator core 5 and a stator coil 4 of a ceramic oil cooling structure, a stator encapsulated in a soft magnetic composite material housing, the stator comprises a stator coil 4 and a stator core 5, an outer rotor of a carbon nanotube-ceramic composite air cooling structure 10, and the outer rotor comprises a left rotor 2 and a right rotor; the stator 4 (5) and the outer rotor 2 (9) constitute an axial magnetic flux closed loop; the stator housing 8 is fixed on the central shaft 1, the outer rotor 2 (9) is arranged on the outer side of the stator 4 (5) and is connected to the central shaft 1 ( Figure 1 );

[0033] like Figure 2 As shown, the stator core 5 adopts at least one of the following three ceramic oil-cooling structure models: (1) a silicon steel sheet stator core 5 is adopted, and ceramic stripes 7 are arranged on the surface of the silicon steel sheet; (2) a narrow silicon steel sheet stator core 5 is adopted, and pores 11 are arranged between the narrow silicon steel sheets; (3) the stator core 5 adopts a soft magnetic composite material-honeycomb structure.

[0034] Specifically, in some embodiments, the stator core 5 adopts the first model, see Figure 1 and Figure 2 The stator core 5 is made of silicon steel sheets. In the stator core model (1), ceramic stripes 7 are used on the surface of the silicon steel sheets, including a ceramic-resin composite material coating with a coating thickness of 30nm-100μm, and the ceramic stripes 7 are arranged at intervals. The ceramic stripes 7 include straight stripes and / or curved stripes.

[0035] In other embodiments, the stator core model can also adopt the second model, in which the stator core is made of narrow silicon steel sheets, the narrow silicon steel sheets are set to have a width of 4-20 mm, and pores 11 are left between the narrow silicon steel sheets, the pores 11 have a width of 50 nm-200 μm, and are assembled into a stator core 5 of an oil-cooled structure.

[0036] In other embodiments, the stator core model may also adopt the third model, where the stator core 5 adopts a soft magnetic composite material-honeycomb structure and is provided with oil cooling pores 11. The distributed heat dissipation structure is provided by using ceramic-cooling oil to improve the insulation and heat dissipation effects.

[0037] In some embodiments, the stator coil 4 adopts at least one of the following two ceramic oil-cooling structure models: (1) a ceramic coating 6 is provided on the conductor surface of the stator coil 4, (2) the stator coil 4 adopts a soft magnetic composite material-honeycomb structure;

[0038] In this embodiment, the stator coil 4 adopts the first model, see Figure 3 ; In the model (1) of the stator coil 4 ( Figure 3 ), the conductor surface of the stator coil 4 is coated with ceramic stripes, which also includes ceramic-resin composite material coating, and the coating thickness is 8μm-400μm

[0039] In other embodiments, the stator coil 4 may also adopt the second model. In the model (2) of the stator coil 4, the stator coil 4 adopts a soft magnetic composite material-honeycomb structure and is provided with oil cooling pores 11.

[0040] The stator coil 4 of the wheel hub motor generates the most heat. The thermal conductivity of the insulating material is low. The heat generated by the stator coil 4 is difficult to transfer through the insulating layer. The stator coil 4 is set as a ceramic pore oil cooling 7 structure to improve the thermal conductivity of the motor. It also includes setting a polymer-ceramic composite material to enable the stator coil 4 to continuously dissipate heat.

[0041] The stator includes a stator core 5 and a stator coil 4. The stator as a whole is packaged with a soft magnetic composite material box to form a soft magnetic composite material stator box 8. Figure 5 The stator is set to a closed oil cooling box structure to prevent the cooling oil from generating heat and pressure due to friction during the rotation of the outer rotor 2 (9), resulting in air leakage and oil leakage. The rotor permanent magnet 3 adopts a carbon nanotube-ceramic composite air cooling structure 10, please refer to Figure 1 and Figure 4 The outer rotor 2 (9) is air-cooled by carbon nanotubes. By providing the ceramic stripes 7, not only oil cooling channels are formed between silicon steel sheets, but also the eddy current loss between silicon steel sheets can be greatly reduced, thus achieving continuous distributed heat dissipation.

[0042] The stator 4 (5) is enclosed by a stator housing 8 made of a soft magnetic composite material, see Figure 1 and Figure 5, the stator housing is provided with a circulating oil inlet 12 and a circulating oil outlet 13, and the stator housing is fixed on the main shaft 1. In the present embodiment, the soft magnetic composite material of the stator housing adopts a composite material of alloy and resin with a grade of 1J22 in the Fe-Co series, wherein the resin is an insulating coating material. The wall thickness of the soft magnetic composite material stator housing 8 is 2mm-10cm. While the soft magnetic composite material has a lower coercive force and magnetic loss, it also has a higher saturation magnetization, resistivity and magnetic permeability, and can be directly pressed into the desired stator housing shape. The alloy of the soft magnetic material 1J22, the saturation magnetization of the alloy can reach 2.4T. The nanocrystalline alloy is a nanocrystalline alloy obtained by heat treatment at an appropriate temperature with FeSiB as the main component, and obtains high magnetic permeability and high saturation magnetization. In other embodiments, the stator housing can also adopt other soft magnetic composite materials or insulating coating materials.

[0043] The outer rotor includes a left rotor 2 and a right rotor 9. Figure 1 and Figure 2 The left rotor 2 and the right rotor 9 are both arranged on the outside of the stator housing 8, and the outer rotor 2 (9) is connected to the central shaft 1 through a bearing 17; the left rotor 2 and the right rotor 9 are connected through a housing 15; the inner sides of the left rotor 2 and the right rotor 9 are both provided with the permanent magnet 3, and the permanent magnet 3 adopts a carbon nanotube-ceramic composite air-cooled connection structure 10, please refer to Figure 1 and Figure 4 .

[0044] A carbon nanotube-ceramic composite air cooling structure 10 is arranged around the permanent magnet 9. Figure 1 and Figure 4 , including setting up a carbon nanotube-ceramic-resin composite material structure, the diameter of the carbon nanotube is 16-100nm, and the thickness of the composite material air-cooling structure is 5-20mm. Utilizing the hole ventilation cooling of the carbon nanotube, the carbon nanotube can synthesize a highly anisotropic thermal conductive material. As long as a trace amount of carbon nanotubes is doped into the composite material, the thermal conductivity of the composite material will be greatly improved. In addition, carbon nanotubes have excellent mechanical properties, and their specific gravity is only one-sixth of that of steel. The carbon nanotube-ceramic composite air-cooling structure 10 is used in the hub motor rotor air-cooling structure, and has the advantages of good thermal conductivity, light weight and high strength.

[0045] The central shaft 1 is provided with oil cooling and air cooling channels. Figure 1 The circulating oil inlet 12 and the circulating oil outlet 13 are connected to the heat dissipation pipe outside the motor, and the housing 15 is provided with an exhaust outlet 16 ( Figure 4 ).

[0046] A vehicle air conditioner is provided, and the vehicle air conditioner port is connected to the ventilation inlet 14 of the central axis. Cooling gas is provided to the machine through the ventilation inlet 14 to improve the cooling effect, and hot air is discharged to the outside from the exhaust outlet 16 of the housing 15. Figure 1 and Figure 4 .

[0047] In this embodiment, the utility model adopts a ceramic structure cooling channel, see Figure 1-Figure 5 The stator core 5 adopts the first model, and ceramic stripes 7 are arranged on the surface of the silicon steel sheet of the stator core 5. The stator coil 4 adopts the first model, and a ceramic coating 6 is applied on the conductor surface of the stator coil 4. The stator core 5 and the stator coil 4 are packaged into an integral structure by a soft magnetic composite material stator box 8. The stator core 5 and the stator coil 4 in the soft magnetic composite material stator box 8 are circulated oil-cooled by a ceramic pore oil cooling 11 structure; the outer rotor 2 (9) is air-cooled by a carbon nanotube pipe; the composite material with good thermal conductivity and the cooling channel with nanostructure are used to evenly distribute the heat, which can effectively improve the cooling effect of the hub motor.

[0048] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, and the utility model is also intended to include these modifications and modifications.

Claims

1. A hub motor with a ceramic oil cooling structure, characterized in that: It comprises a stator with a ceramic oil cooling structure and an outer rotor with a carbon nanotube air cooling structure; the stator and the outer rotor form an axial magnetic flux closed loop; the stator is fixed on a central shaft, and the outer rotor is arranged on the outside of the stator and connected to the central shaft through a bearing; The stator core adopts at least one of the following three ceramic oil-cooling structure models: (1) a silicon steel sheet stator core is adopted, and ceramic stripes are arranged on the surface of the silicon steel sheet, (2) a narrow silicon steel sheet stator core is adopted, and pores are arranged between the narrow silicon steel sheets, (3) a soft magnetic composite material-honeycomb structure is adopted for the stator core; The stator coil adopts at least one of the following two ceramic oil-cooling structure models: (1) a ceramic coating is provided on the conductor surface of the stator coil, (2) the stator coil adopts a soft magnetic composite material honeycomb structure; The stator core and the coil as a whole are enclosed by a soft magnetic composite material box to form a stator box. The outer rotor includes a left rotor and a right rotor. The left rotor and the right rotor are connected by a casing. Permanent magnets are arranged on the inner sides of the left rotor and the right rotor. The permanent magnets adopt a carbon nanotube-ceramic composite air-cooled structure.

2. The hub motor with ceramic oil cooling structure according to claim 1 is characterized in that: The stator is enclosed by a soft magnetic composite material stator box, a circulating oil inlet and a circulating oil outlet are arranged on the stator box, and the stator box is fixed on the main shaft; the wall thickness of the soft magnetic composite material stator box is 2mm-10cm.

3. The hub motor with ceramic oil cooling structure according to claim 1 is characterized in that: In the stator core model (1), ceramic coating is performed on the surface of the silicon steel sheet, including using a ceramic-resin composite material coating, the coating thickness is 30nm-100μm, and ceramic stripes are arranged at intervals, and the ceramic stripes include straight stripes and / or curved stripes; In the stator core model (2), the width of the narrow silicon steel sheet is set to 4-20 mm, and pores are left between the narrow silicon steel sheets. The pore width is 50 nm-200 μm and then assembled into a stator core with an oil cooling structure; In the stator core model (3), the stator core adopts a soft magnetic composite material-honeycomb structure and is provided with pore oil cooling.

4. The hub motor with ceramic oil cooling structure according to claim 1 is characterized in that: In the stator coil model (1), ceramic coating is performed on the conductor surface of the stator coil, which also includes coating with a ceramic-resin composite material, and the coating thickness is 8 μm-400 μm; In the stator coil model (2), the stator coil adopts a soft magnetic composite material-honeycomb structure and is provided with oil cooling pores.

5. The hub motor with ceramic oil cooling structure according to claim 1 is characterized in that: The left rotor and the right rotor are both arranged on the outside of the stator housing, and the outer rotor is connected to the central shaft through a bearing.

6. The hub motor with ceramic oil cooling structure according to claim 2, characterized in that: The central shaft is provided with oil cooling and air cooling channels, the circulating oil inlet and outlet are connected to the heat dissipation pipeline outside the motor, and the casing is provided with an exhaust outlet.

7. The hub motor with ceramic oil cooling structure according to claim 1 or 5, characterized in that: A carbon nanotube-ceramic composite air-cooling structure is arranged around the permanent magnet, and also includes a carbon nanotube-ceramic-resin composite material structure. The diameter of the carbon nanotube is 16-100nm, and the thickness of the composite material air-cooling structure is 5-20mm.

8. The hub motor with ceramic oil cooling structure according to claim 1 or 6, characterized in that: It also includes a vehicle air conditioner, wherein the vehicle air conditioner port is communicated with the ventilation inlet of the central shaft.

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