Efficient oil-cooling modular stator axial magnetic flux permanent magnet hub motor and cooling method thereof

Abstract

The invention discloses a high-efficiency oil-cooling modularized stator axial magnetic flux permanent magnet hub motor and a cooling method thereof. The motor comprises a stator mechanism, a rotor mechanism is arranged on the outer side of the stator mechanism, and a circulating cooling mechanism and a cooling sealing mechanism are arranged on the stator mechanism and the rotor mechanism; the circulating cooling mechanism is used for circularly cooling the stator mechanism and the rotor mechanism; according to the axial magnetic flux permanent magnet wheel hub motor, efficient oil cooling heat exchange is achieved in the motor in an oil cooling injection cooling mode, heat generated by a stator iron core and a stator winding in the motor is effectively taken away, and therefore the axial magnetic flux permanent magnet wheel hub motor can be effectively cooled. Meanwhile, the overall structure of the motor is compact, the cooling effect is effectively improved without increasing the size of the motor, the heat dissipation efficiency of the motor is improved, and the cooling cost is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of motors, and in particular relates to a high-efficiency oil-cooled modular stator axial flux permanent magnet hub motor and a cooling method thereof. Background Art

[0002] The advantages of wheel hub motors, such as compact structure, high transmission performance, high flexibility, adoption of new energy technologies, and energy conservation and environmental protection, make them have broad application prospects in the field of new energy vehicle motors. The modular stator axial flux permanent magnet wheel hub motor has high power density and compact design, effectively utilizes space and provides powerful output; its modular characteristics simplify the assembly and maintenance process and reduce long-term operating costs; the axial flux layout reduces the length of the magnetic circuit, improves efficiency and reduces material consumption; in addition, the design also brings lower operating noise. These characteristics make it an ideal choice for electric vehicles and other high-efficiency power systems. However, with the increase in motor power, its heat dissipation problem has become increasingly prominent, and the cooling method of the wheel hub motor has also received widespread attention.

[0003] The existing wheel hub motor has the following problems: 1. The existing wheel hub motor cooling methods mainly use air cooling and wind cooling, but the heat dissipation area is relatively low, which greatly affects the heat dissipation efficiency. In addition, the installation position of the wheel hub motor is relatively closed, and the heat dissipation space is limited. Especially under high load conditions, the wheel hub motor is prone to overheating, which affects its service life; 2. The existing hub motor cooling method still uses oil immersion cooling, which has the problems of poor sealing and difficult maintenance. In addition, in order to pursue higher power density, the structure of axial flux permanent magnet hub motor is often very compact, which limits the effective area of ​​the heat dissipation path, thereby increasing the risk of heat accumulation; 3. Oil cooling has the problem of easy leakage of cooling oil. Air cooling and wind cooling require additional power sources (such as fans). Failure of the above additional components may cause cooling failure, thus affecting the safety and reliability of the hub motor. To this end, we propose a high-efficiency oil-cooled modular stator axial flux permanent magnet hub motor and its cooling method. Summary of the invention

[0004] The object of the present invention is to provide a high-efficiency oil-cooled modular stator axial flux permanent magnet hub motor and a cooling method thereof, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions: a high-efficiency oil-cooled modular stator axial flux permanent magnet hub motor, comprising a stator mechanism, a rotor mechanism is arranged outside the stator mechanism, and a circulating cooling mechanism and a cooling sealing mechanism are arranged on the stator mechanism and the rotor mechanism; The circulating cooling mechanism is used to cyclically cool the stator mechanism and the rotor mechanism; The cooling sealing mechanism is used to seal and connect the stator mechanism and the rotor mechanism, thereby achieving sealing of the axial flux permanent magnet hub motor.

[0006] Preferably, the stator mechanism comprises a stator base, stator cooling teeth, a stator core and a stator winding; There are a plurality of stator cooling teeth, which are distributed in a ring shape on the outer periphery of the stator base, and the stator core and the stator winding are arranged between adjacent stator cooling teeth.

[0007] Preferably, the rotor mechanism comprises a rotor housing, an end cover, a magnetic steel back plate and a permanent magnet; The rotor housing is arranged on the outside of the stator mechanism, and the end covers are arranged on both sides of the rotor housing. The end covers are rotatably arranged on the stator base through a rotating shaft and a bearing, and the magnetic steel back plate and the permanent magnet are arranged in sequence on the inner side of the end covers.

[0008] Preferably, the circulating cooling mechanism comprises a cooling oil inlet port and a cooling oil outlet port; The stator base is provided with an isolated semi-annular cooling oil inlet cavity and a semi-annular cooling oil outlet cavity, the cooling oil inlet port and the cooling oil outlet port are respectively arranged at positions on the stator base corresponding to the semi-annular cooling oil inlet cavity and the semi-annular cooling oil outlet cavity, and the cooling oil inlet port is located above the cooling oil outlet port, the cooling oil inlet port is communicated with the semi-annular cooling oil inlet cavity, the cooling oil outlet port is communicated with the semi-annular cooling oil outlet cavity, and the cooling oil inlet port and the cooling oil outlet port are externally connected to an oil cooling circulation system; A plurality of stator cooling tooth oil inlet channels are provided inside the stator cooling tooth corresponding to the semi-annular cooling oil inlet channel portion, the stator cooling tooth oil inlet channel is communicated with the semi-annular cooling oil inlet channel, and an injection port communicated with the stator cooling tooth oil inlet channel is provided at the end of the stator cooling tooth in this portion; A plurality of positioning cooling tooth oil outlet channels are provided inside the stator cooling tooth corresponding to the semi-annular cooling oil outlet channel portion, the positioning cooling tooth oil outlet channels are connected to the semi-annular cooling oil outlet channel, and an oil outlet connected to the positioning cooling tooth oil outlet channel is provided at the end of the stator cooling tooth of this portion; An annular cooling channel is formed between the stator mechanism and the rotor mechanism; A circulating cooling channel is formed between the semi-annular cooling oil inlet channel, the stator cooling tooth oil inlet channel, the injection port, the annular cooling channel, the oil outlet, the positioning cooling tooth oil outlet channel and the semi-annular cooling oil outlet channel.

[0009] Preferably, the inner diameter of the cooling oil inlet port is larger than the inner diameter of the stator cooling tooth oil inlet passage.

[0010] Preferably, the cooling sealing mechanism comprises two oil baffles, and the two oil baffles are spliced ​​and arranged between the stator mechanism and the rotor mechanism, and the annular cooling channel is formed between the two oil baffles.

[0011] Preferably, the two oil baffles are sealed and connected via a sealing bolt, and the connection between the two oil baffles is sealed and connected via a sealant.

[0012] Preferably, the thickness of the oil baffle is 0.8-1.2 mm.

[0013] Preferably, the cooling sealing mechanism further includes a UVW three-phase outlet seal, a thermistor outlet seal and an oil-proof breathable valve; The UVW three-phase outlet seal is an M1205 cable gland, and the UVW three-phase outlet seal seals the UVW three-phase outlet port arranged on the stator base; The thermistor outlet seal is an M805 cable gland, and the thermistor outlet seal seals the thermistor outlet provided on the stator base; The oil-proof breathable valve is sealingly arranged on the stator base.

[0014] A cooling method for a high-efficiency oil-cooled modular stator axial flux permanent magnet hub motor comprises the following steps: A: When the axial flux permanent magnet hub motor is running, the oil cooling circulation system introduces 9L / min of cooling oil into the cooling oil inlet port, and the cooling oil enters the semi-annular cooling oil inlet cavity, and then is transported by the stator cooling tooth oil inlet channel inside the stator cooling tooth corresponding to the semi-annular cooling oil inlet cavity. Since the inner diameter of the cooling oil inlet port is larger than the inner diameter of the stator cooling tooth oil inlet channel, under the action of continuous circulating cooling oil supply, the cooling oil generates pressure at the injection port, so that the cooling oil is sprayed into the annular cooling channel through the injection port, and then quickly diffuses and fully mixes on the stator core and stator winding, so as to cool down the axial flux permanent magnet hub motor; B: After the cooling oil absorbs heat in the axial flux permanent magnet hub motor, under the action of gravity and pressure, the cooling oil reaches the stator cooling tooth position corresponding to the semi-annular cooling oil outlet channel through the annular cooling channel, enters the cooling tooth oil outlet channel in the stator cooling tooth corresponding to the semi-annular cooling oil outlet channel through the oil outlet, then enters the semi-annular cooling oil outlet channel, and finally circulates from the cooling oil outlet port to the oil cooling circulation system to complete the circulating cooling of the axial flux permanent magnet hub motor.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. In the present invention, a circulating cooling mechanism is provided on the stator mechanism and the rotor mechanism, so that the cooling oil forms a circulating cooling and cooling between the semi-annular cooling oil inlet cavity, the stator cooling tooth oil inlet channel, the injection port, the annular cooling channel, the oil outlet, the positioning cooling tooth oil outlet channel and the semi-annular cooling oil outlet cavity. An annular cooling channel is provided on the inner side of the oil baffle plate. Through the cooling method of oil cooling injection, efficient oil cooling heat exchange is achieved inside the motor, and the heat generated by the stator core and the stator winding inside the motor is effectively taken away. At the same time, the overall structure of the motor is compact, and the cooling effect is effectively improved without increasing the volume of the motor, which greatly improves the heat dissipation efficiency of the motor, improves the power / torque density of the motor, effectively reduces the cooling cost, and further improves the power performance of the vehicle; 2. The present invention adopts an oil baffle seal, a UVW three-phase outlet seal, a thermistor outlet seal and an oil-proof breathable valve to achieve high sealing of the motor, provide a sealing ring for the heat dissipation of the motor cooling oil, avoid leakage of the motor cooling oil, and ensure the normal operation of the motor cooling and heat dissipation; 3. In the present invention, the two oil baffles are sealed and connected by sealing bolts, and the connection between the two oil baffles is sealed and connected by sealant, so as to achieve effective sealing of the two oil baffles, avoid sealing failure problems on the connection surfaces of the two oil baffles, and further avoid cooling oil from entering the rotor mechanism and causing the risk of oil leakage in the rotor mechanism, thereby improving the sealing performance of the interval between the motor rotor mechanism and the stator mechanism, and ensuring the normal use of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present invention; Figure 2 It is a schematic diagram of the overall cross-sectional structure of the present invention; Figure 3 It is a schematic diagram of the three-dimensional structure of the oil baffle connection of the present invention; Figure 4 It is a partial three-dimensional structural schematic diagram of the present invention; Figure 5 It is a schematic diagram of a partial decomposition structure of the present invention; Figure 6 It is a cross-sectional structural schematic diagram of the present invention; Figure 7 It is a schematic diagram of the cross-sectional structure of the present invention.

[0017] In the figure: 1. stator base; 2. stator cooling teeth; 3. stator core; 4. stator winding; 5. rotor housing; 6. end cover; 7. magnetic steel back plate; 8. permanent magnet; 9. rotating shaft; 10. bearing; 11. cooling oil inlet port; 12. cooling oil outlet port; 13. semi-annular cooling oil inlet cavity; 14. semi-annular cooling oil outlet cavity; 15. stator cooling tooth oil inlet channel; 16. injection port; 17. positioning cooling tooth oil outlet channel; 18. oil outlet; 19. annular cooling channel; 20. oil baffle; 21. sealing bolt; 22. UVW three-phase outlet seal; 23. thermistor outlet seal; 24. oil-proof breathable valve. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] See also Figure 1-Figure 7 The high-efficiency oil-cooled modular stator axial flux permanent magnet hub motor provided by the present invention comprises a stator mechanism, which comprises a stator base 1, a stator cooling tooth 2, a stator core 3 and a stator winding 4; a plurality of stator cooling teeth 2 are annularly distributed on the outer periphery of the stator base 1, and a stator core 3 and a stator winding 4 are arranged between adjacent stator cooling teeth 2; The stator cooling teeth 2 serve as modular fixings of the stator mechanism, improving the rigidity and strength of the entire stator mechanism; The rotor mechanism is arranged outside the stator mechanism, and the rotor mechanism includes a rotor housing 5, an end cover 6, a magnetic steel back plate 7 and a permanent magnet 8; the rotor housing 5 is arranged outside the stator mechanism, and end covers 6 are arranged on both sides of the rotor housing 5, and the end covers 6 are rotatably arranged on the stator base 1 through a rotating shaft 9 and a bearing 10, and the magnetic steel back plate 7 and the permanent magnet 8 are arranged on the inner side of the end cover 6 in sequence, and a circulating cooling mechanism and a cooling sealing mechanism are arranged on the stator mechanism and the rotor mechanism; The circulating cooling mechanism is used for circulating and cooling the stator mechanism and the rotor mechanism, and the circulating cooling mechanism includes a cooling oil inlet port 11 and a cooling oil outlet port 12; a semi-annular cooling oil inlet cavity 13 and a semi-annular cooling oil outlet cavity 14 are provided in the stator base 1, and the cooling oil inlet port 11 and the cooling oil outlet port 13 are respectively arranged at positions corresponding to the semi-annular cooling oil inlet cavity 13 and the semi-annular cooling oil outlet cavity 13 on the stator base 1, and the cooling oil inlet port 11 is located above the cooling oil outlet port 13, the cooling oil inlet port 11 is connected to the semi-annular cooling oil inlet cavity 13, the cooling oil outlet port 12 is connected to the semi-annular cooling oil outlet cavity 14, and the cooling oil inlet port 11 and the cooling oil outlet port 12 are externally connected to an oil cooling circulation system; A plurality of stator cooling tooth oil inlet passages 15 are provided inside the stator cooling tooth 2 corresponding to the semi-annular cooling oil inlet passage 13. The stator cooling tooth oil inlet passage 15 is connected to the semi-annular cooling oil inlet passage 13, and an injection port 16 connected to the stator cooling tooth oil inlet passage 15 is provided at the end of the stator cooling tooth 2. The inner diameter of the cooling oil inlet port 11 is larger than the inner diameter of the stator cooling tooth oil inlet passage 15. Since the inner diameter of the cooling oil inlet port 11 is larger than the inner diameter of the stator cooling tooth oil inlet passage 15, under the action of continuous circulating cooling oil supply, the cooling oil generates pressure at the injection port 16, so that the cooling oil is injected into the annular cooling passage 19 through the injection port 16, thereby improving the heat exchange efficiency of the cooling oil. A plurality of positioning cooling tooth oil outlet passages 17 are provided inside the stator cooling tooth 2 corresponding to the semi-annular cooling oil outlet passage 14, and the positioning cooling tooth oil outlet passage 17 is connected to the semi-annular cooling oil outlet passage 14, and an oil outlet 18 connected to the positioning cooling tooth oil outlet passage 17 is provided at the end of the stator cooling tooth 2 of this part; An annular cooling channel 19 is formed between the stator mechanism and the rotor mechanism, and an annular cooling channel 19 is formed between the two oil baffles 20; A circulating cooling channel is formed between the semi-annular cooling oil inlet channel 13, the stator cooling gear oil inlet channel 15, the injection port 16, the annular cooling channel 19, the oil outlet 18, the positioning cooling gear oil outlet channel 17 and the semi-annular cooling oil outlet channel 14; In the present invention, a circulating cooling mechanism is provided on the stator mechanism and the rotor mechanism, so that the cooling oil forms a circulating cooling and cooling process between the semi-annular cooling oil inlet cavity 13, the stator cooling tooth oil inlet cavity 15, the injection port 16, the annular cooling channel 19, the oil outlet 18, the positioning cooling tooth oil outlet cavity 17 and the semi-annular cooling oil outlet cavity 14. The annular cooling channel 19 is provided on the inner side of the oil baffle plate. Through the cooling method of oil cooling injection, efficient oil cooling heat exchange is achieved inside the motor, and the heat generated by the stator core and the stator winding inside the motor is effectively taken away. At the same time, the overall structure of the motor is compact, and the cooling effect is effectively improved without increasing the volume of the motor, which greatly improves the heat dissipation efficiency of the motor, improves the power / torque density of the motor, effectively reduces the cooling cost, and further improves the power performance of the vehicle. The cooling sealing mechanism is used to seal the stator mechanism and the rotor mechanism to achieve the sealing of the axial flux permanent magnet hub motor. The cooling sealing mechanism includes two oil baffles 20, which are spliced ​​and arranged between the stator mechanism and the rotor mechanism. The two oil baffles 20 are sealed and connected by sealing bolts 21, and the connection between the two oil baffles 20 is sealed and connected by sealant. The contact area is large and the connectivity is good, which can effectively prevent the leakage of oil and the impact pressure caused by its injection. The thickness of the oil baffle 20 is 0.8-1.2mm, which meets the common requirements of the electromagnetic and strength of the motor. In the present invention, the two oil baffles 20 are sealed and connected by the sealing bolts 21, and the connection of the two oil baffles 20 is sealed and connected by the sealant, so as to achieve effective sealing of the two oil baffles, avoid the sealing failure problem on the connection surface of the two oil baffles 20, and further avoid the cooling oil from entering the rotor mechanism, resulting in the risk of the rotor mechanism losing oil, improve the interval sealing between the motor rotor mechanism and the stator mechanism, and ensure the normal use of the motor; The cooling sealing mechanism also includes a UVW three-phase outlet seal 22, a thermistor outlet seal 23 and an oil-proof breathable valve 24; The UVW three-phase outlet seal 22 is an M1205 cable gland. The UVW three-phase outlet seal 22 seals the UVW three-phase outlet port on the stator base 1 to ensure the safe fixation and sealing of the cable in the motor or structure, and provides necessary protection to prevent dust, water vapor and other foreign substances from entering the motor. The thermistor outlet seal 23 is an M805 cable gland, and the thermistor outlet seal 23 seals the thermistor outlet arranged on the stator base 1 to ensure the safe fixation and sealing of the cable in the motor or structure, and provides necessary protection to prevent dust, water vapor and other foreign substances from entering the motor; The oil-proof breathable valve 24 is sealed and arranged on the stator base 1. The oil-proof breathable valve 24 provides a controlled ventilation path between the inside and outside of the motor. When the internal pressure of the motor increases, the oil-proof breathable valve 24 allows excess gas to be discharged; when the internal pressure of the motor decreases, the oil-proof breathable valve 24 allows air to enter to prevent the formation of a vacuum. At the same time, the oil-proof breathable valve 24 is designed with a filter or other filtering mechanism to prevent external pollutants from entering the device; The present invention adopts an oil baffle plate 20 seal, a UVW three-phase outlet seal 22, a thermistor outlet seal 23 and an oil-proof breathable valve 24 to achieve high sealing of the motor, provide a sealing ring for the heat dissipation of the motor cooling oil, avoid leakage of the motor cooling oil, and ensure the normal operation of the motor cooling and heat dissipation.

[0020] like Figure 6 and Figure 7 As shown, the cooling method of the high-efficiency oil-cooled modular stator axial flux permanent magnet hub motor provided by the present invention comprises the following steps: A: When the axial flux permanent magnet hub motor is running, the oil cooling circulation system introduces 9L / min of cooling oil into the cooling oil inlet port 11, and the cooling oil enters the semi-annular cooling oil inlet cavity 13, and is then transported by the stator cooling tooth oil inlet channel 15 inside the stator cooling tooth 2 corresponding to the semi-annular cooling oil inlet cavity 13. Since the inner diameter of the cooling oil inlet port 11 is larger than the inner diameter of the stator cooling tooth oil inlet channel 15, under the action of continuous circulating cooling oil supply, the cooling oil generates pressure at the injection port 16, so that the cooling oil is sprayed into the annular cooling channel 19 through the injection port 16, and then quickly diffuses and fully mixes on the stator core 3 and the stator winding 4, so as to cool the inside of the axial flux permanent magnet hub motor; B: After the cooling oil absorbs heat in the axial flux permanent magnet hub motor, under the action of gravity and pressure, the cooling oil passes through the annular cooling channel 19 to reach the position of the stator cooling tooth 2 corresponding to the semi-annular cooling oil outlet cavity 14, enters the cooling tooth oil outlet channel 17 in the stator cooling tooth 2 corresponding to the semi-annular cooling oil outlet cavity 14 through the oil outlet 18, then enters the semi-annular cooling oil outlet cavity 14, and finally circulates from the cooling oil outlet port 12 to the oil cooling circulation system, completing the circulating cooling of the axial flux permanent magnet hub motor.

[0021] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-efficiency oil-cooled modular stator axial flux permanent magnet hub motor, characterized in that: It comprises a stator mechanism, a rotor mechanism is arranged outside the stator mechanism, and a circulating cooling mechanism and a cooling sealing mechanism are arranged on the stator mechanism and the rotor mechanism; The circulating cooling mechanism is used to cyclically cool the stator mechanism and the rotor mechanism; The cooling sealing mechanism is used to seal and connect the stator mechanism and the rotor mechanism, thereby achieving sealing of the axial flux permanent magnet hub motor.

2. The high-efficiency oil-cooled modular stator axial flux permanent magnet hub motor according to claim 1, characterized in that: The stator structure comprises a stator base (1), stator cooling teeth (2), a stator core (3) and a stator winding (4); There are a plurality of stator cooling teeth (2), which are distributed in a ring shape on the outer periphery of the stator base (1), and the stator core (3) and the stator winding (4) are arranged between adjacent stator cooling teeth (2).

3. The high-efficiency oil-cooled modular stator axial flux permanent magnet hub motor according to claim 2, characterized in that: The rotor mechanism comprises a rotor housing (5), an end cover (6), a magnetic steel back plate (7) and a permanent magnet (8); The rotor housing (5) is arranged on the outside of the stator mechanism, and the end covers (6) are arranged on both sides of the rotor housing (5). The end covers (6) are rotatably arranged on the stator base (1) via a rotating shaft (9) and a bearing (10), and the magnetic steel back plate (7) and the permanent magnet (8) are arranged in sequence on the inner side of the end covers (6).

4. The high-efficiency oil-cooled modular stator axial flux permanent magnet hub motor according to claim 3, characterized in that: The circulating cooling mechanism comprises a cooling oil inlet port (11) and a cooling oil outlet port (12); The stator base (1) is provided with a semi-annular cooling oil inlet cavity (13) and a semi-annular cooling oil outlet cavity (14) which are isolated from each other; the cooling oil inlet port (11) and the cooling oil outlet port (13) are respectively arranged at positions on the stator base (1) corresponding to the semi-annular cooling oil inlet cavity (13) and the semi-annular cooling oil outlet cavity (13); the cooling oil inlet port (11) is located above the cooling oil outlet port (13); the cooling oil inlet port (11) and the semi-annular cooling oil inlet cavity (13) are in communication; the cooling oil outlet port (12) and the semi-annular cooling oil outlet cavity (14) are in communication; and the cooling oil inlet port (11) and the cooling oil outlet port (12) are externally connected to an oil cooling circulation system; A plurality of stator cooling tooth oil inlet passages (15) are provided inside the stator cooling tooth (2) corresponding to the semi-annular cooling oil inlet passage (13), the stator cooling tooth oil inlet passage (15) is connected to the semi-annular cooling oil inlet passage (13), and an injection port (16) connected to the stator cooling tooth oil inlet passage (15) is provided at the end of the stator cooling tooth (2) in this portion; A plurality of positioning cooling tooth oil outlet passages (17) are provided inside the stator cooling tooth (2) corresponding to the semi-annular cooling oil outlet passage (14), the positioning cooling tooth oil outlet passages (17) are connected to the semi-annular cooling oil outlet passage (14), and an oil outlet (18) connected to the positioning cooling tooth oil outlet passage (17) is provided at the end of the stator cooling tooth (2) in this portion; An annular cooling channel (19) is formed between the stator mechanism and the rotor mechanism; A circulating cooling channel is formed between the semi-annular cooling oil inlet channel (13), the stator cooling tooth oil inlet channel (15), the injection port (16), the annular cooling channel (19), the oil outlet (18), the positioning cooling tooth oil outlet channel (17) and the semi-annular cooling oil outlet channel (14).

5. The high-efficiency oil-cooled modular stator axial flux permanent magnet hub motor according to claim 4, characterized in that: The inner diameter of the cooling oil inlet port (11) is greater than the inner diameter of the stator cooling tooth oil inlet passage (15).

6. The high-efficiency oil-cooled modular stator axial flux permanent magnet hub motor according to claim 2, characterized in that: The cooling sealing mechanism comprises two oil baffles (20), the two oil baffles (20) being spliced ​​and arranged between the stator mechanism and the rotor mechanism, and the annular cooling channel (19) is formed between the two oil baffles (20).

7. The high-efficiency oil-cooled modular stator axial flux permanent magnet hub motor according to claim 6, characterized in that: The two oil baffles (20) are sealed and connected via a sealing bolt (21), and the connection between the two oil baffles (20) is sealed and connected via a sealant.

8. The high-efficiency oil-cooled modular stator axial flux permanent magnet hub motor according to claim 7, characterized in that: The thickness of the oil baffle plate (20) is 0.8-1.2 mm.

9. The high-efficiency oil-cooled modular stator axial flux permanent magnet hub motor according to claim 2, characterized in that: The cooling sealing mechanism further comprises a UVW three-phase outlet seal (22), a thermistor outlet seal (23) and an oil-proof breathable valve (24); The UVW three-phase outlet seal (22) is an M1205 cable gland, and the UVW three-phase outlet seal (22) seals the UVW three-phase outlet port provided on the stator base (1); The thermistor outlet seal (23) is an M805 cable gland, and the thermistor outlet seal (23) seals the thermistor outlet port arranged on the stator base (1); The oil-proof breathable valve (24) is sealingly arranged on the stator base (1).

10. A cooling method for a high-efficiency oil-cooled modular stator axial flux permanent magnet hub motor according to any one of claims 1 to 9, characterized in that: The steps include: A: When the axial flux permanent magnet hub motor is running, the oil cooling circulation system introduces 9L / min of cooling oil into the cooling oil inlet port (11), and the cooling oil enters the semi-annular cooling oil inlet cavity (13), and is then transported by the stator cooling tooth oil inlet channel (15) inside the stator cooling tooth (2) corresponding to the semi-annular cooling oil inlet cavity (13). Since the inner diameter of the cooling oil inlet port (11) is larger than the inner diameter of the stator cooling tooth oil inlet channel (15), under the action of continuous circulating cooling oil supply, the cooling oil generates pressure at the injection port (16), so that the cooling oil is injected into the annular cooling channel (19) through the injection port (16), and then quickly diffuses and is fully mixed on the stator core (3) and the stator winding (4), thereby cooling the axial flux permanent magnet hub motor; B: After the cooling oil absorbs heat in the axial flux permanent magnet hub motor, under the action of gravity and pressure, the cooling oil passes through the annular cooling channel (19) to the position of the stator cooling tooth (2) corresponding to the semi-annular cooling oil outlet channel (14), enters the cooling tooth oil outlet channel (17) in the stator cooling tooth (2) corresponding to the semi-annular cooling oil outlet channel (14) through the oil outlet (18), then enters the semi-annular cooling oil outlet channel (14), and finally circulates through the cooling oil outlet port (12) to the oil cooling circulation system, thereby completing the circulation cooling of the axial flux permanent magnet hub motor.

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