A three-stator hub motor of a wire slot oil cooling structure

Abstract

The utility model discloses a kind of three-stator hub motors of wire slot oil cooling structure, comprising: three stator, wire slot oil cooling structure, iron core end surface oil cooling structure, three rotor and main shaft.Three-stator core is set as: radial stator core, axial left stator core, axial right stator core;Three-stator core uses 1J22 high-permeability magnetic alloy sheet, and amino organosilicon resin sealing is used between iron core sheet;Three-stator wire slot head is closed, and wire slot tail is wired;Radial stator core is set as the nested structure of inside and outside two layers, and the wire slot tail of outer layer core is closed using inner layer core and amino organosilicon resin;Axial left and right stator wire slot tail core are mutually closed, and its wire slot tail is embedded into oil pipe;Oil cooling structure is set along three-stator core wire slot and end surface, and annular oil cooling passage containing coil is formed.Set annular oil cooling passage between the coil of three stator, can improve the heat dissipation efficiency of hub motor iron core and coil.

Description

Technical Field

[0001] This utility model relates to the field of hub motor technology, and is a three-stator hub motor with a grooved oil-cooled structure. Background Technology

[0002] Permanent magnet hub motors, characterized by their compact structure, small size, light weight, and high torque and power density, are widely used in the electric vehicle field. Heat dissipation is a significant issue for hub motors, as they generate high temperatures during operation that are difficult to dissipate. Excessive heat leads to reduced motor efficiency and insulation aging, severely impacting motor performance and lifespan. Therefore, the design of the heat dissipation structure for hub motors is crucial. Currently, the main methods for reducing hub motor temperature rise are air cooling and liquid cooling through cooling channels. Air cooling is simple and low-cost, but its heat dissipation effect is poor. Liquid cooling is more effective, but still falls short of meeting heat dissipation requirements. Designing an efficient heat dissipation structure is a pressing technical problem that needs to be solved in the development of hub motors.

[0003] Regarding the stator core structure, novel materials such as 1J22 high-permeability alloy sheets, thin silicon steel sheets, soft magnetic composite materials, and amorphous alloys can be used. 1J22 is a high-saturation magnetic induction iron-cobalt-vanadium soft magnetic alloy, with a saturation magnetic induction intensity (2.4T) higher than that of silicon steel sheets (1.8T), a high Curie point (980℃), and the largest saturation magnetostriction coefficient (60~100×10⁻⁶). -6 Due to its high saturation magnetic induction, the size of the alloy can be significantly reduced when manufacturing motors of the same power. Its high Curie point allows the alloy to operate at higher temperatures than other soft magnetic materials, while maintaining good magnetic stability.

[0004] With the rapid development of the new energy vehicle industry, the demand for amino silicone resins has increased significantly. This material has a heat resistance range of 200-250℃, with even higher short-term heat resistance. It is also compression resistant and has excellent electrical insulation and waterproof and moisture-proof properties. It is widely used in the manufacture of motors for new energy vehicles as a coating, adhesive, and sealant.

[0005] Currently, the water-cooling structure model for hub motors mainly uses embedded water channels to improve heat dissipation. The effectiveness of this method largely depends on the rationality of the channel design. Conventional water cooling of the casing has limited cooling capacity and is gradually failing to meet the cooling requirements of hub motors. Direct oil cooling is a highly efficient cooling method. It utilizes the excellent insulating properties of oil to directly contact the motor windings, permanent magnets, and other heat-generating components, carrying away heat and shortening the heat transfer path. This effectively increases the upper limit of line load or current density. Chinese utility model patent application CN117639314A discloses a stator heat dissipation structure for a hub motor. Cooling liquid can be introduced into the heat dissipation channels of the stator body to dissipate heat during operation. However, this heat dissipation structure is close to the stator hub, making it difficult to effectively dissipate heat to the coils and core in the center of the stator. Chinese utility model patent application CN117559725A discloses a stator liquid-cooled heat exchange ring structure. Heat exchange is achieved through a liquid-cooled heat exchange structure located within the ring structure, used for heat exchange with each winding assembly. This utility model only dissipates heat at one end of the winding, limiting its effectiveness. Chinese utility model patent application CN... 116436187A discloses a method that allows external oil to enter the rotor oil circuit through a hollow oil passage, and sets an annular oil circuit in the stator body. The oil returns to the oil tank after passing through the hollow oil passage of the main shaft, the rotor oil circuit, the stator oil circuit and the oil storage chamber, forming an oil cooling cycle. This utility model has a complex cooling structure, and the sealing ring set between the inner rotor and the stator is easy to affect the operating efficiency of the hub motor and cause oil leakage. Utility Model Content

[0006] To overcome the shortcomings of existing technologies, this utility model designs a three-stator hub motor with a grooved oil-cooled structure. It involves an annular oil-cooled structure between the coils of the three stators, which utilizes the contact between the cooling oil and the motor windings and iron core for heat dissipation, thereby effectively improving the heat dissipation efficiency of the hub motor.

[0007] The present invention adopts the following technical solution to solve the technical problem:

[0008] This utility model designs a hub motor with a groove as an oil cooling channel, specifically a three-stator hub motor with a groove oil cooling structure, including three stators, a groove oil cooling structure, an iron core end face oil cooling structure, three rotors and a main shaft. The three stator cores are configured as follows: radial stator core, axial left stator core, and axial right stator core. The three stator cores use 1J22 high-permeability alloy sheets, and the sheets are sealed with amino silicone resin. The head of the stator slots is closed, and the tail of the slots is lowered. The radial stator core is configured with an inner and outer nested structure, with the inner core and amino silicone resin sealing the tail of the outer core slot. The tail cores of the axial left and right stator slots are mutually sealed, and oil outlet pipes are embedded at their tails. Oil cooling structures containing coils are installed along the radial and axial slots of the three stator cores, and end-face oil cooling structures containing end-face coils are installed along the end faces of the radial and axial slots of the three stator cores. Using the gap structure between the slots and coils and the end-face oil cooling structure, an annular oil cooling channel containing the coils is formed. Inlet and outlet oil pipes are installed on the main shaft. By utilizing an external circulating cooling device, external cooling oil is channeled through the hollow oil passages of the spindle to directly contact the main heat-generating parts of the three stator coils and the iron core, which can effectively dissipate heat.

[0009] The features of this hub motor with a slotted wire as an oil cooling channel are as follows: the radial stator core is set as an inner and outer nested structure, and the two cores are made of 1J22 high permeability alloy sheet; the slotted wire is set on the outer core, the head of the slotted wire is closed, the distance between the outer surface of the outer core and the head of the slotted wire is 4-20mm, the cross-sectional area of ​​the slotted wire is 1 / 20-1 / 4 larger than the cross-sectional area of ​​the oil cooling structure without slotted wire, the inner surface of the outer core is provided with the tail of the slotted wire, and the coil is embedded in the tail of the slotted wire. There is no slotted wire on the inner core; after the coil is embedded, the outer core and the inner core are sealed and connected by amino silicone resin to form the entire radial stator, and the tail of the slotted wire on the outer core is also sealed; the slotted wire oil cooling structure is generated by the gap between the slotted wire and the coil.

[0010] The radial stator core end-face oil cooling structure includes: an outer radial stator core, an inner radial stator core, a left-end annular oil cooling structure, and a right-end annular oil cooling structure. The left and right annular oil cooling structures are made of aluminum alloy. The inner and outer cores are sealed and connected using amino silicone resin, and the left and right annular oil cooling structures are sealed and connected to the inner and outer cores using bolts. The left and right ends of the radial stator core are configured as annular oil cooling structures containing the end-face coils. The entire oil cooling channel of the radial stator is arranged along the coils, including the slots and the gaps between the coils, and the annular oil cooling structures at both ends.

[0011] The features of this hub motor with a slotted groove as an oil cooling channel are as follows: the left and right axial stator cores are made of 1J22 high-permeability alloy sheets; the heads of the slots on the left and right axial stator cores are closed, and the distance between the outer edge of the left and right stator cores and the head of the slot is set to 4-20mm respectively. The cross-sectional area of ​​the slot is increased by 1 / 20-1 / 4 compared with the cross-sectional area of ​​the oil cooling structure without slot. The coil is embedded in the tail of the slot, and the oil outlet pipe is embedded in the slot at the tail. The tails of the left and right axial stator cores are sealed and connected with amino silicone resin to form the entire axial stator core. The slotted groove oil cooling structure is generated by utilizing the gap between the slot and the coil.

[0012] The axial left and right stator core inner and outer end face oil cooling structure includes: an axial left stator core, an axial right stator core, an axial stator outer sleeve, and an axial stator inner sleeve. The axial left and right stator inner and outer sleeves are made of aluminum alloy. The axial left and right stator cores are sealed and connected using amino silicone resin. The axial left and right stator inner and outer sleeves are sealed and connected to the axial left and right stator cores using bolts. The inner and outer end faces of the axial left and right stator cores are set as annular oil cooling channels containing end face coils. The entire axial left and right stator oil cooling structure includes the gap between the wire slot and the coil, and the annular oil cooling structure at both end faces.

[0013] The hub motor of this utility model with a groove as the oil cooling channel is characterized by the following: the three stator oil cooling channels are configured as follows: main shaft oil inlet → axial stator inner sleeve oil passage → axial stator groove → axial stator outer sleeve → radial stator oil inlet pipe → radial stator left end annular oil cooling structure → radial stator groove → radial stator right end annular oil cooling structure → radial stator oil outlet pipe → axial stator groove tail oil outlet pipe → axial stator inner sleeve → main shaft outlet.

[0014] The features of this hub motor using slotted wires as oil cooling channels are as follows: the three stator cores are made of 1J22 high-permeability alloy sheets, which are sealed and connected by amino silicone resin; the layers of the radial stator are sealed and connected by amino silicone resin; and the left and right stators in the axial direction are sealed and connected by amino silicone resin. The radial and axial end faces of the three stator cores are set as annular oil cooling structures, which are made of aluminum alloy. The oil cooling structure of the three stator cores utilizes amino silicone resin to seal the spaces between the iron sheets, between the layers, and on the end faces, forming annular oil cooling structures between the slotted wires and the coils, as well as on both end faces. By using oil with good insulation properties to directly contact the motor windings, iron core slots, end face iron cores, and other heat-generating components, heat is carried away, shortening the heat transfer path, resulting in a large and uniform heat dissipation area, which can effectively improve the motor load and power density.

[0015] The characteristic of this hub motor with a grooved oil cooling channel is that the three stator cores are made of 1J22 high-permeability alloy sheet; or the three stator cores are made of silicon steel sheet. 1J22 has high saturation magnetic induction intensity, which can greatly reduce the size when manufacturing hub motors of the same power; to reduce manufacturing costs, similar materials can be selected to replace the 1J22 high-permeability alloy sheets.

[0016] The hub motor of this utility model with a groove as an oil cooling channel is characterized by the following: the three stators include a radial stator and axial left and right stators, the radial stator and axial left and right stators are fixedly connected and fixedly connected to the main shaft through an internal frame structure; the main shaft is a hollow main shaft, and an oil inlet and an oil outlet are provided inside the main shaft. One end of the oil inlet and the oil outlet are connected to the inner sleeve of the axial stator, and the other end is connected to an external cooling device.

[0017] The hub motor of this utility model with a groove as an oil cooling channel is characterized in that: the three rotors include a radial rotor and an axial double rotor, the permanent magnet on the radial rotor is fixed to the radial rotor back iron, the permanent magnet on the axial double rotor is fixed to the axial double rotor back iron, the radial rotor back iron and the axial double rotor back iron are fixed to the frame, and the frame is connected to the main shaft by bearings.

[0018] The hub motor of this invention, which uses a groove as an oil cooling channel, is characterized by the following: the hub motor is configured with a three-stator structure, the three stators are configured with an oil cooling structure along the circumference of the coil, and external devices are used to provide circulating cooling; the three rotors are outer rotors, and the three stators and the outer rotors form radial and axial magnetic flux loops.

[0019] Compared with existing technologies, the beneficial effects of this utility model are reflected in: 1. Precise cooling, high heat exchange rate, and excellent heat dissipation. Typically, the heat generated in the middle of the wire groove is large and difficult to dissipate. By using the gaps between the wire grooves as oil cooling channels, and setting up oil cooling channels between the coils where the heat generation is greatest in the hub motor, most of the heat generated by the copper loss of the windings and the iron loss of the iron core is removed, resulting in the most significant heat dissipation effect.

[0020] 2. Uniform heat dissipation. Through evenly distributed wire grooves, including the oil cooling channels of the three stator core end face coils and the core, the heat dissipation area is large and the heat dissipation is uniform. By controlling the circulation oil volume, the motor temperature can be kept stable within the set range.

[0021] 3. Increased power density. 1J22 has a high saturation magnetic induction intensity (2.4T), which is higher than that of silicon steel sheets (1.8T). When manufacturing hub motors with the same power, the size can be greatly reduced.

[0022] 4. Reduced eddy current losses in the iron core. Amino silicone resin has a heat resistance range of 200-250℃, with even higher short-term heat resistance. It is also compression resistant and possesses excellent electrical insulation and waterproof / moisture-proof properties. Using amino silicone resin to bond the iron core and the double-layer iron core reduces eddy current losses in the iron core and lowers the motor temperature.

[0023] 5. Simple structure and easy manufacturing. Multi-channel oil cooling circulation heat dissipation is implemented to address the structural characteristics of hub motors, improving their heat resistance and making them widely applicable. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of a three-stator hub motor. Figure 2 Schematic diagram of radial stator core; Figure 3 Schematic diagram of the left and right stator cores along the axis; Labels in the diagram: 1. Main spindle; 2. Frame; 3. Axial left rotor permanent magnet; 4. Axial stator slot oil outlet pipe; 5. Radial stator oil inlet pipe; 6. Axial stator outer sleeve assembly position; 7. Radial stator coil; 8. Radial stator inner core; 9. Radial stator outer core; 10. Radial rotor permanent magnet; 11. Radial stator oil outlet pipe; 12. Axial right rotor permanent magnet; 13. Rotor back iron; 14. Axial left stator core; 15. Axial right stator core; 16. Axial stator coil; 17. Main spindle oil inlet; 8. Axial stator inner sleeve oil passage; 19. Bearing; 20. Radial stator left end annular oil cooling structure; 21. Connecting screw hole; 22. Radial stator oil inlet; 23. Radial stator right end annular oil cooling structure; 24. Connecting screw hole; 25. Radial stator oil outlet; 26. Axial stator outer sleeve; 27-1. Axial stator outer sleeve oil outlet; 27-2. Axial stator outer sleeve oil outlet pipe channel; 28. Connecting screw hole; 29. ​​Axial stator inner sleeve; 30. Oil outlet; 31. Connecting screw hole; 32. Axial stator oil inlet. Detailed Implementation

[0025] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0026] Furthermore, the terms "first," "second," "third," etc., used in the specification and claims are only for the purpose of distinguishing the description of the same technical features and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated, nor necessarily the order of description or chronological sequence. Where appropriate, the terms are interchangeable. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature.

[0027] Similarly, the term "connection" is used in the specification and claims and should not be construed as limited to a direct connection. Therefore, the expression "device A is connected to device B" should not be limited to device A being directly connected to device B in a device or system; it means that there is a path between device A and device B, which can be a path that includes other devices or tools.

[0028] This utility model relates to a three-stator hub motor with a grooved oil-cooled structure, which mainly includes: a main shaft 1, an axial stator groove tail oil outlet pipe 4, a radial stator oil inlet pipe 5, an axial stator outer sleeve assembly position 6, a radial stator inner core 8, a radial stator outer core 9, a radial stator oil outlet pipe 11, an axial left stator core 14, an axial right stator core 15, an axial stator inner sleeve oil passage 18, a radial stator left end annular oil-cooling structure 20, a radial stator oil inlet 22, a radial stator right end annular oil-cooling structure 23, a radial stator oil outlet 25, an axial stator outer sleeve 26, an axial stator inner sleeve 29, and an oil outlet 30.

[0029] To make the objectives, technical solutions, and advantages of this utility model clearer, the utility model will be further described below with reference to the accompanying drawings.

[0030] See Figure 1-3A three-stator hub motor with a slotted oil-cooled structure is disclosed. The three stators are configured as follows: the radial stator core consists of an inner core 8 and an outer core 9, forming a double-nested structure; the radial stator coil 7 is mounted on the outer core 9, while the inner core 8 is not equipped with a coil; the head of the slot on the outer core 9 is closed, and the coil 7 is inserted into the slot by threading at the tail. The inner core 8 then seals the tail of the slot on the outer core 9 to prevent oil leakage from the head or tail of the slot; the axial left and right stator cores are configured as a left stator core 14 and a right stator core 15, with axial stator coils 16 mounted on the left and right stator cores 14 and 15. The heads of the slots on the left and right stator cores 14 and 15 are also closed. After the coil 16 is embedded in the end of the slot, the left stator 14 and the right stator 15 are relatively closed and connected, and the end of the slot is sealed to prevent oil from leaking from the head or tail of the slot. The slot oil cooling structure containing the coils 7 and 16 is set along the radial and axial slots of the three stator cores 8, 9, 14 and 15. The annular oil cooling structures 20, 23, 26 and 29 containing the end face coils 7 and 16 are set along the radial and axial slots of the three stator cores 8, 9, 14 and 15. The use of the annular oil cooling structures 20, 23, 26 and 29 can prevent oil from leaking from the end face of the core. The annular oil cooling channel containing the coils 7 and 16 is formed by the gap structure between the slot and the coils 7 and 16 and the annular oil cooling structures 20, 23, 26 and 29. The three stators utilize the hollow oil passages of the main shaft 1 and the axial stator inner sleeve oil passages 18 to transmit external cooling oil to the annular oil cooling structures 20, 23, 26, and 29 on the end faces of the three stator cores 8, 9, 14, and 15, directly cooling the main heat-generating parts such as the three stator slotted coils 7 and 16, the slotted cores, the end face coils 7 and 16, and the end face cores.

[0031] See Figure 1-2The radial stator inner and outer cores 8 and 9 are made of 1J22 high-permeability alloy sheets; the head of the slot on the outer core 9 is closed, and the distance between the head of the slot and the outer surface is 4-20mm. The cross-sectional area of ​​the slot is increased by 1 / 20-1 / 4 compared with the cross-sectional area of ​​the oil-cooled structure without slots; after the coil 7 is embedded, the outer core 9 and the inner core 8 are sealed and connected by amino silicone resin to form the entire radial stator cores 8 and 9. The slot oil-cooled structure is generated by the gap between the slot and the coil 7. The radial stator end-face oil cooling structure includes: an outer radial stator core 9, an inner radial stator core 8, a left-end annular oil cooling structure 20, and a right-end annular oil cooling structure 23. The left and right annular oil cooling structures 20 and 23 are made of aluminum alloy. The inner and outer cores 8 and 9 are sealed and connected using amino silicone resin. The left and right annular oil cooling structures 20 and 23 are sealed and connected to the inner and outer cores 8 and 9 using screw holes 21 and 24. The left and right ends of the radial stator cores are configured as annular oil cooling structures 20 and 23 containing the end-face coils. The entire oil cooling channel of the radial stator is arranged along the coil, including the gap between the wire slot and the coil 7, and the annular oil cooling structures 20 and 23 at both ends. Using the above oil cooling structure, the main heat-generating parts such as the radial stator 9 slotted coil 7, slotted iron core 9, end face coil 7, and end face iron cores 8 and 9 can be precisely cooled, and the temperature of the radial stator 8 and 9 can be stabilized within the set range by controlling the circulating oil volume.

[0032] See Figure 1 and Figure 3The axial left and right stator cores 14 and 15 are made of 1J22 high-permeability alloy sheets; the heads of the slots on the axial left and right stator cores 14 and 15 are closed, and the distance between the head of the slot and the outer edge is 4-20mm. The cross-sectional area of ​​the slot is increased by 1 / 20-1 / 4 compared with the cross-sectional area of ​​the oil cooling structure without slot. The coil 16 is embedded in the tail of the slot, and the axial stator slot tail oil outlet pipe 4 is embedded in the slot at its tail. The tails of the axial left and right stator cores 14 and 15 are sealed and connected with amino silicone resin to form the entire axial stator cores 14 and 15. The slot oil cooling structure is generated by utilizing the gap between the slot and the coil 16. The axial left and right stator cores 14 and 15 inner and outer end face oil cooling structure includes: an axial left stator core 14, an axial right stator core 15, an axial stator outer sleeve 26, and an axial stator inner sleeve 29. The axial left and right stator inner and outer sleeves 26 and 29 are made of aluminum alloy. The axial left and right stator cores 14 and 15 are sealed and connected using amino silicone resin. The axial left and right stator inner and outer sleeves 26 and 29 are sealed and connected to the axial left and right stator cores 14 and 15 using screw holes 28 and 31. The inner and outer end faces of the axial left and right stator cores 14 and 15 are set as annular oil cooling channels containing the end face coils 16. The entire oil cooling structure of the axial left and right stators 14 and 15 includes the gap between the wire groove and the coil 16 and the annular oil cooling structures 26 and 29 at both end faces. Using the above oil-cooling structure, the main heat-generating parts such as the axial left and right stator cores 14 and 15, the slotted coil 16, the slotted core, the end face coil 16, and the end face core can be directly cooled and multi-channel oil-cooling circulation heat dissipation can be carried out to improve heat dissipation efficiency.

[0033] See Figure 1-3 The three stator oil cooling channels are configured as follows: main shaft oil inlet 17 → axial stator oil inlet 32 ​​→ axial stator inner sleeve oil passages 18, 29, 30 → axial stator grooves 14, 15 → axial stator outer sleeves 6, 26 → axial stator outer sleeve oil outlet 27-1 → radial stator oil inlet pipes 5, 22 → radial stator left end annular oil cooling structure 20 → radial stator groove → radial stator right end annular oil cooling structure 23 → radial stator oil outlet pipes 11, 25 → axial stator outer sleeve oil outlet pipe channel 27-2 → axial stator groove tail oil outlet pipe 4 → axial stator inner sleeves 18, 29 → oil outlet 30 → main shaft 1 outlet; through circulating cooling oil, the main heat-generating parts of the three stator coils and iron core are directly contacted, and the heat can be carried to the external cooling device.

[0034] See Figure 1The three stator cores 8, 9, 14, and 15 are made of 1J22 high-permeability alloy sheets. The 1J22 high-permeability alloy sheets are sealed and connected with amino silicone resin. The radial stators 8 and 9 are sealed and connected with amino silicone resin between their layers. The axial left and right stators 14 and 15 are also sealed and connected with amino silicone resin. Using amino silicone resin to seal the iron sheets and core layers prevents oil leakage within the core. Simultaneously, amino silicone resin has high heat resistance, compression resistance, and excellent electrical insulation and waterproof / moisture-proof properties. Furthermore, sealing the iron sheets and core layers with amino silicone resin reduces eddy current losses in the core.

[0035] See Figure 1-3 The radial and axial end faces of the three stator cores 8, 9, 14, and 15 are configured as annular oil cooling structures 20, 23, 26, and 29, and the annular oil cooling structures 20, 23, 26, and 29 are made of aluminum alloy.

[0036] See Figure 1 The three stator cores 8, 9, 14, and 15 employ a 1J22 high-permeability alloy sheet structure. 1J22 has high saturation magnetic induction intensity, which can significantly reduce the size when manufacturing hub motors of the same power. The three stator cores can be constructed using either a 1J22 high-permeability alloy sheet structure or a silicon steel sheet structure; to reduce manufacturing costs, similar materials can be selected to replace the 1J22 high-permeability alloy sheets.

[0037] See Figure 1 , Figure 3 The three stator cores—radial inner stator core 8, radial outer stator core 9, axial left stator core 14, and axial right stator core 15—are fixedly connected and connected to the main shaft 1 via an internal frame. The main shaft 1 is a hollow main shaft 1, with an oil inlet 17 and an oil outlet 30 inside. One end of the oil inlet 17 and the oil outlet 30 is connected to the axial inner stator sleeves 18 and 29, and the other end is connected to an external cooling device.

[0038] See Figure 1 The three rotors are configured as follows: the radial rotor is equipped with a radial permanent magnet 10 and a rotor back iron 13; the axial double rotor is configured as an axial left rotor permanent magnet 3 and a rotor back iron 13, and an axial right rotor permanent magnet 12 and a rotor back iron 13; the radial rotor back iron and the axial double rotor back iron 13 are fixedly connected to the frame 2, and the frame 2 is connected to the main shaft 1 through a bearing 19; the three rotors are outer rotors, and the three stators and the outer rotors form radial and axial magnetic flux loops.

[0039] The beneficial effects of this utility model are reflected in the fact that the three stator iron core utilizes the oil cooling structures 20, 23, 26, and 29 of the wire slots and iron core end faces to circulate oil cooling for the heating components such as coils 7 and 16, wire slots, and iron cores 8, 9, 14, and 15, resulting in uniform heat dissipation and a large heat dissipation area, which can effectively improve the heat dissipation performance of the hub motor.

[0040] The structural features of this utility model have been described in detail above with reference to the figures. This utility model is not limited to the scope of implementation shown in the figures. Any changes made in accordance with the concept of this utility model, or equivalent embodiments modified to have equivalent changes, shall be within the protection scope of this utility model as long as they do not exceed the spirit covered by the specification and figures.

Claims

1. A three-stator hub motor with a grooved oil-cooled structure, characterized in that: The system includes three stators, a slotted oil-cooled structure, an iron core end-face oil-cooled structure, three rotors, and a main shaft. The three stator iron cores are configured as follows: a radial stator iron core, an axial left stator iron core, and an axial right stator iron core. The three stator iron cores use 1J22 high-permeability alloy sheets, and the iron sheets are sealed with amino silicone resin. The head of the three stator slots is closed, and the end of the slots is lowered. The radial stator iron core is configured as an inner and outer nested structure, and the end of the slot of the outer core is sealed with the inner core and amino silicone resin. The end cores of the axial left and right stator slots are mutually sealed, and oil outlet pipes are embedded in their slot ends. Slotted oil-cooled structures containing coils are set along the radial and axial slots of the three stator iron cores, and end-face oil-cooled structures containing end-face coils are set along the end faces of the radial and axial slots of the three stator iron cores. The annular oil-cooling channel containing the coils is formed by the gap structure between the slots and the coils and the end-face oil-cooling structure. The main shaft is used to set up inlet and outlet oil pipes.

2. The three-stator hub motor with a grooved oil-cooled structure according to claim 1, characterized in that: The axial left stator core and the axial right stator core are made of 1J22 high-permeability alloy sheet; slots are set on the outer core, the head of the slot is closed, the distance between the outer surface of the outer core and the head of the slot is 4-20mm, the cross-sectional area of ​​the slot is 1 / 20-1 / 4 larger than the cross-sectional area of ​​the oil cooling structure without slots, the inner surface of the outer core has a slot tail, and the coil is embedded in the slot tail. There are no slots on the inner core; after the coil is embedded, the outer core and the inner core are sealed and connected to form the entire radial stator with amino silicone resin, and the slot tail on the outer core is also sealed; the slot oil cooling structure is generated by the gap between the slot and the coil. The radial stator core end-face oil cooling structure includes: a radial stator outer core, a radial stator inner core, a radial stator left-end annular oil cooling structure, and a radial stator right-end annular oil cooling structure. The radial stator left and right end annular oil cooling structures are made of aluminum alloy. The inner and outer cores are sealed and connected using amino silicone resin, and the left and right end annular oil cooling structures are sealed and connected to the inner and outer cores using bolts. The left and right ends of the radial stator core are set as annular oil cooling structures containing end-face coils. The entire oil cooling channel of the radial stator is arranged along the coil, including the slots and the gaps between the coils and the annular oil cooling structures at both ends.

3. The three-stator hub motor with a grooved oil-cooled structure according to claim 1, characterized in that: The axial left and right stator cores are made of 1J22 high-permeability alloy sheets; the heads of the slots on the axial left and right stator cores are closed, and the distance between the outer edge of the left and right stator cores and the head of the slots is set to 4-20mm respectively. The cross-sectional area of ​​the slots is increased by 1 / 20-1 / 4 compared to the cross-sectional area of ​​the oil cooling structure without slots. The coil is embedded in the tail of the slot, and the oil outlet pipe is embedded in the slot at the tail. The tails of the axial left and right stator cores are sealed and connected with amino silicone resin to form the entire axial stator core; the slot oil cooling structure is generated by utilizing the gap between the slot and the coil. The axial left and right stator core inner and outer end face oil cooling structure includes: an axial left stator core, an axial right stator core, an axial stator outer sleeve, and an axial stator inner sleeve. The axial left and right stator inner and outer sleeves are made of aluminum alloy. The axial left and right stator cores are sealed and connected using amino silicone resin. The axial left and right stator inner and outer sleeves are sealed and connected to the axial left and right stator cores using bolts. The inner and outer end faces of the axial left and right stator cores are set as annular oil cooling channels containing end face coils. The entire axial left and right stator oil cooling structure includes the gap between the wire slot and the coil, and the annular oil cooling structure at both end faces.

4. The three-stator hub motor with a grooved oil-cooled structure according to claim 1, characterized in that: The three stator oil cooling channels are configured as follows: spindle oil inlet → axial stator inner sleeve oil passage → axial stator groove → axial stator outer sleeve → radial stator oil inlet pipe → radial stator left end annular oil cooling structure → radial stator groove → radial stator right end annular oil cooling structure → radial stator oil outlet pipe → axial stator groove tail oil outlet pipe → axial stator inner sleeve → spindle outlet.

5. The three-stator hub motor with a grooved oil-cooled structure according to claim 1, 2, or 3, characterized in that: The three stator cores are made of 1J22 high-permeability alloy sheets, which are sealed and connected by amino silicone resin. The layers of the radial stator are sealed and connected by amino silicone resin, and the left and right stators of the axial direction are sealed and connected by amino silicone resin. The radial and axial end faces of the three stator cores are set as annular oil-cooling structures, which are made of aluminum alloy.

6. The three-stator hub motor with a grooved oil-cooled structure according to claim 1, 2, or 3, characterized in that: The three stator cores are made of 1J22 high-permeability alloy sheets or silicon steel sheets.

7. The three-stator hub motor with a grooved oil-cooled structure according to claim 1, characterized in that: The three stators include a radial stator and axial left and right stators; the radial stator and axial left and right stators are fixedly connected and fixedly connected to the main shaft through an internal frame structure; the main shaft is a hollow main shaft, and an oil inlet and an oil outlet are provided inside the main shaft. One end of the oil inlet and the oil outlet are connected to the inner sleeve of the axial stator, and the other end is connected to an external cooling device.

8. The three-stator hub motor with a grooved oil-cooled structure according to claim 1, characterized in that: The three rotors include a radial rotor and an axial double rotor. The permanent magnet on the radial rotor is fixed to the radial rotor back iron, and the permanent magnet on the axial double rotor is fixed to the axial double rotor back iron. The radial rotor back iron and the axial double rotor back iron are fixed to the frame, and the frame is connected to the main shaft by bearings.

9. The three-stator hub motor with a grooved oil-cooled structure according to claim 1, characterized in that: The hub motor is configured with a three-stator structure, and the three stators are configured with an oil-cooled structure along the circumference of the coil, using an external device to provide circulating cooling; the three rotors are outer rotors, and the three stators and the outer rotors form radial and axial magnetic flux loops.

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