A heat dissipation device of an in-wheel motor

Abstract

The application relates to a heat dissipation device of a wheel hub motor, which comprises a mandrel, a stator support, a stator core, the stator support is sleeved and fixed on the mandrel, the stator core comprises a plurality of stator teeth, windings are wound on the stator teeth, a plurality of cooling water channels are further arranged, a plurality of heat dissipation fins are arranged on the side surface of the stator support, the two ends of the mandrel are respectively provided with a mandrel water inlet for feeding cooling liquid and a mandrel water outlet for discharging the cooling liquid, the cooling water channels are arranged in the mandrel, the stator support and the heat dissipation fins, the two ends of the cooling water channels are respectively communicated with the mandrel water inlet and the mandrel water outlet, the stator core is nested on the stator support, the stator teeth are located between the two adjacent heat dissipation fins, and the windings are directly or indirectly contacted with the heat dissipation fins. The cooling water channels arranged in the mandrel, the stator support and the heat dissipation fins can conduct overall heat dissipation of the motor, the heat dissipation area is large, the heat dissipation effect is good, the temperature of the motor is reduced, and the efficiency of the motor is improved.

Description

TECHNICAL FIELD

[0001] The application relates to a heat dissipation device of a wheel hub motor and belongs to the technical field of wheel hub motors. BACKGROUND

[0002] The wheel hub motor is widely applied in many fields such as electric vehicles, but with the increase of power and the complexity of working conditions, heat dissipation becomes a key problem. A large amount of heat is generated by the winding, the core and the permanent magnet during the operation of the wheel hub motor. The traditional natural cooling and air cooling mode is difficult to meet the heat dissipation demand of the high-power motor due to low efficiency and structural limitations. The existing liquid cooling scheme also has problems such as cooling liquid distribution, heat exchange and sealing, so that there is a lack of efficient and reliable heat dissipation device in the wheel hub motor, which cannot meet the demand of motor heat dissipation. SUMMARY

[0003] The application aims at the shortcomings of the prior art and provides a heat dissipation device of a wheel hub motor with good heat dissipation effect.

[0004] To achieve the purpose, the application adopts the technical scheme of:

[0005] A heat dissipation device of a wheel hub motor, comprising a core shaft, a stator support and a stator core, the stator support is fixedly sleeved on the core shaft, the stator core comprises a plurality of stator teeth, windings are wound on the stator teeth, a plurality of cooling water channels are further included, a plurality of heat dissipation fins are arranged on the side surface of the stator support, a core shaft water inlet for introducing cooling liquid and a core shaft water outlet for discharging cooling liquid are arranged at the two ends of the core shaft respectively, the cooling water channels are arranged in the core shaft, the stator support and the heat dissipation fins, the two ends of the cooling water channels are in communication with the core shaft water inlet and the core shaft water outlet respectively, the stator core is nested on the stator support, the stator teeth are located between the adjacent two heat dissipation fins, and the windings are in direct or indirect contact with the heat dissipation fins.

[0006] As a further optimization of the above technical scheme, the stator support comprises a support inner ring, a heat dissipation ring, a support outer ring and a plurality of connecting strips, the support inner ring is fixedly sleeved on the core shaft, the support outer ring is fixedly connected with the support inner ring through a plurality of connecting strips, the heat dissipation ring is sleeved on the connecting strips and located on the side surface of the support outer ring, and a plurality of heat dissipation fins are uniformly distributed on the side surface of the support outer ring and arranged around the heat dissipation ring.

[0007] As a further optimization of the above technical solutions: the cooling water channel on the stator support is distributed on the inner ring of the support, the connecting strip, the heat dissipation ring and the outer ring of the support, the water channel in the outer ring of the support is communicated with the water channel in the heat dissipation fin, the water channel in the outer ring of the support and the water channel in the heat dissipation ring are communicated with the water channel in the connecting strip, the water channel in the connecting strip is communicated with the water channel in the inner ring of the support, the water channel in the inner ring of the support is communicated with the water channel in the mandrel, the water channel in the mandrel is communicated with the water inlet of the mandrel and the water outlet of the mandrel, and the water channel in the outer ring of the support and the water channel in the heat dissipation ring are separated from each other.

[0008] As a further optimization of the above technical solutions: after the cooling liquid is introduced from the water inlet of the mandrel, it flows through the mandrel, the inner ring of the support, the connecting strip, the heat dissipation ring, and finally is discharged through the water outlet of the mandrel, forming a complete cooling water channel; after the cooling liquid is introduced from the water inlet of the mandrel, it flows through the mandrel, the inner ring of the support, the connecting strip, the outer ring of the support, the heat dissipation fin, and finally is discharged through the water outlet of the mandrel, forming a second complete cooling water channel, and the two cooling water channels simultaneously cool.

[0009] As a further optimization of the above technical solutions: the cooling water channel includes a plurality of support water inlets, a plurality of support water outlets, a first support water channel and a plurality of second support water channels in the outer ring of the support, the support water inlets and the support water outlets are communicated with the water channel in the connecting strip, the first support water channel is communicated with all the support water outlets, a plurality of second support water channels are arranged separately and each second support water channel is communicated with the support water inlet, a U-shaped communication water channel is formed in the heat dissipation fin, and two ends of the communication water channel are communicated with the first support water channel and the second support water channel.

[0010] As a further optimization of the above technical solutions: the two ends of the mandrel are hollow, the cooling water channel includes a plurality of water inlet channels, a plurality of water outlet channels, a plurality of water inlet hole groups and a plurality of water outlet hole groups in the middle section of the mandrel, the water inlet channels are communicated with the water inlet of the mandrel, the water outlet channels are communicated with the water outlet of the mandrel, the water inlet hole groups are communicated with the water inlet channels, the water outlet hole groups are communicated with the water outlet channels, the water inlet hole groups include a plurality of first water inlet holes and a plurality of second water inlet holes, and the water outlet hole groups include a plurality of first water outlet holes and a plurality of second water outlet holes.

[0011] As a further optimization of the above technical solutions: the cooling water channel further comprises a plurality of first support water inlet channels, a plurality of second support water inlet channels, a plurality of first support water outlet channels and a plurality of second support water outlet channels penetrating through the support inner ring and the connecting strip, the first support water inlet channels are in communication with the first water inlet through holes, the second support water inlet channels are in communication with the second water inlet through holes and the support water inlet holes, the first support water outlet channels are in communication with the first water outlet through holes, and the second support water outlet channels are in communication with the second water outlet through holes and the support water outlet holes.

[0012] As a further optimization of the above technical solutions: the cooling water channel further comprises a plurality of heat dissipation water inlet holes, a plurality of heat dissipation water outlet holes and two groups of heat dissipation water channels located in the heat dissipation ring, the heat dissipation water inlet holes are in communication with the first support water inlet channels, the heat dissipation water outlet holes are in communication with the first support water outlet channels, and the two groups of heat dissipation water channels are arranged in parallel and separated, and each group of heat dissipation water channels is in communication with different heat dissipation water inlet holes and different heat dissipation water outlet holes.

[0013] As a further optimization of the above technical solutions: a plurality of guide vanes are further arranged inside the heat dissipation ring, the guide vanes are located in the heat dissipation water inlet holes and the heat dissipation water outlet holes, and the cooling liquid flowing into the heat dissipation water inlet holes is divided by the guide vanes and then moves to the heat dissipation water channels located on both sides of the guide vanes.

[0014] As a further optimization of the above technical solutions: the water inlet channel and the water outlet channel are each provided with three groups, the water inlet hole group is provided with three groups, each group of the water inlet hole group comprises two first water inlet through holes and one second water inlet through hole; the water outlet hole group is also provided with three groups, each group of the water outlet hole group comprises two first water outlet through holes and one second water outlet through hole, and the three groups of water inlet hole groups and the three groups of water outlet hole groups are arranged alternately.

[0015] As a further optimization of the above technical solutions: a water-cooled radiator is further included, the water outlet of the water-cooled radiator is connected with the core shaft water inlet, and the water inlet of the water-cooled radiator is connected with the core shaft water outlet.

[0016] As a further optimization of the above technical solutions: the heat dissipation ring and the connecting strip, and the heat dissipation fins and the support outer ring are fixed by welding.

[0017] As a further optimization of the above technical solutions: when the winding is in indirect contact with the heat dissipation fins, a heat conduction medium is arranged between the winding and the heat dissipation fins.

[0018] As a further optimization of the above technical solutions: the cooling water channel connection between the stator support and the mandrel, and the cooling water channel connection between the stator support and the heat sink are all sealed by sealing glue.

[0019] As a further optimization of the above technical solutions: the winding is a flat wire winding.

[0020] As a further optimization of the above technical solutions: further comprising a rotor and end covers located on both sides of the rotor, the rotor is sleeved on the stator core, the inner circumferential surface of the rotor is pasted with a plurality of permanent magnets, and the two end covers are respectively fixed on the two side surfaces of the rotor by a plurality of screws.

[0021] Compared with the prior art, the present application can cool the motor as a whole by providing cooling water channels in the mandrel, stator support and heat sink, has a large heat dissipation area, good heat dissipation effect, reduces the temperature of the motor, and provides strong support for further optimization of the performance of the motor, ensures that the motor can maintain a stable and excellent working state under high load operation, and improves the efficiency of the motor; the heat sink makes full use of the space between the two adjacent stator teeth, the winding directly contacts the heat sink or indirectly contacts the heat sink through a heat conduction medium, the communication water channel in the heat sink can quickly take away a large amount of heat generated by the winding, ensuring rapid heat dissipation of the winding, and the heat dissipation is more efficient, significantly improving the heat dissipation efficiency of the motor; the mandrel, the inner ring of the support, the connecting strip and the heat dissipation ring form a complete cooling water channel, and the mandrel, the inner ring of the support, the connecting strip, the outer ring of the support and the heat sink form a second complete cooling water channel, the two cooling water channels are cooled at the same time, the heat exchange contact area is increased, the heat exchange effect is enhanced, the cooling liquid is more effective, and the heat generated during the operation of the motor is quickly taken away; the heat dissipation ring is provided with two groups of parallel and separated heat dissipation water channels that are not connected to each other, ensuring that the inner and outer circumferential surfaces of the heat dissipation ring can play a role in heat dissipation; the flow guide fins play a role in dividing the cooling liquid, reducing the degree of turbulence of the water flow, improving the efficiency of heat exchange, and reducing water flow resistance; the water-cooled radiator realizes liquid cooling circulation, is energy-saving and environmentally friendly, and solves the problems of water inlet and water outlet of the cooling liquid; the sealing glue ensures the sealing between the cooling water channel connections, preventing the cooling liquid from leaking out of the gap; the winding is a flat wire winding, which has a higher slot fill rate than the traditional round wire winding, and the flat wire winding has better adhesion between the winding and the stator core, smaller thermal resistance, and is beneficial to the transfer of heat from the winding to the stator core and then dissipation, thereby effectively reducing the temperature rise of the motor and improving the reliability and service life of the motor. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a schematic diagram of the three-dimensional structure of the present application.

[0023] Figure 2 is a schematic diagram of the explosion structure of the present application.

[0024] Figure 3 is the schematic diagram of the exploded structure of the stator support and the stator core in the present application.

[0025] Figure 4 is the schematic diagram of the cross-sectional structure in the present application.

[0026] Figure 5 is another schematic diagram of the cross-sectional structure in the present application.

[0027] Figure 6 is another schematic diagram of the cross-sectional structure in the present application.

[0028] Figure 7 is another schematic diagram of the cross-sectional structure in the present application.

[0029] In the figure: 1, rotor; 2, winding; 3, stator core; 4, stator support; 41, inner ring of the support; 42, heat dissipation ring; 421, water inlet hole for heat dissipation; 422, water outlet hole for heat dissipation; 423, water channel for heat dissipation; 43, outer ring of the support; 431, water inlet hole of the support; 432, water outlet hole of the support; 433, first water channel of the support; 434, second water channel of the support; 44, heat dissipation fin; 441, communication water channel; 45, connecting strip; 46, flow guide fin; 47, first water inlet passage of the support; 48, second water inlet passage of the support; 49, first water outlet passage of the support; 410, second water outlet passage of the support; 5, end cover; 6, screw; 8, mandrel; 81, water inlet of the mandrel; 82, water outlet of the mandrel; 83, water inlet passage; 84, water outlet passage; 85, first water inlet through hole; 86, second water inlet through hole; 87, first water outlet through hole; 88, second water outlet through hole. DETAILED DESCRIPTION

[0030] The present application will be further described below in conjunction with the drawings and specific embodiments. As shown in the drawings: Figures 1-7As shown, a heat dissipation device of a wheel hub motor includes a mandrel 8, a stator support 4, a stator core 3 and a plurality of cooling water channels. The stator support 4 is sleeved and fixed on the mandrel 8, and can be positioned and installed through a key groove or directly welded and fixed between the stator support 4 and the mandrel 8. The side surface of the stator support 4 is provided with a plurality of cooling fins 44, and the two ends of the mandrel 8 are respectively provided with a mandrel water inlet 81 for entering cooling liquid and a mandrel water outlet 82 for discharging cooling liquid. The cooling water channels are distributed in the mandrel 8, the stator support 4 and the cooling fins 44, and the two ends of the cooling water channels are respectively communicated with the mandrel water inlet 81 and the mandrel water outlet 82. The stator core 3 includes a plurality of stator teeth, and the stator teeth are wound with windings 2. The stator core 3 is nested on the stator support 4, so that the stator teeth are located between the adjacent two cooling fins 44, and the windings 2 are in direct or indirect contact with the cooling fins 44. When the windings 2 and the cooling fins 44 are in indirect contact, a heat conduction medium for enhancing heat conduction is arranged between the windings 2 and the cooling fins 44. The heat conduction medium can be selected from heat-conducting silicone grease, graphene heat-conducting sheet, heat-conducting glue, pcm phase change material and the like to assist the heat transfer process from the windings 2 to the cooling fins 44. The cooling water channels in the mandrel 8, the stator support 4 and the cooling fins 44 can conduct overall heat dissipation of the motor, have large heat dissipation area, good heat dissipation effect, reduce the temperature of the motor, thereby providing strong support for further optimization of the performance of the motor, ensuring that the motor can also maintain stable and excellent working state under high load operation, and improving the efficiency of the motor. The stator support 4 not only plays a role of fixing the stator core 3, but also plays a role of cooling the motor, reducing the temperature of the motor and improving the efficiency of the motor. The cooling fins 44 make full use of the space between the adjacent two stator teeth, and the cooling water channels located in the cooling fins 44 can better take away the heat generated by the windings 2, thereby ensuring rapid heat dissipation of the windings 2.

[0031] In the above technical solution: the stator support 4 includes a support inner ring 41, a heat dissipation ring 42, a support outer ring 43 and a plurality of connecting strips 45. The support inner ring 41 is sleeved and fixed on the mandrel 8. The support outer ring 43 is fixedly connected with the support inner ring 41 through the plurality of connecting strips 45. The heat dissipation ring 42 is sleeved on the connecting strips 45 and located at the side surface of the support outer ring 43. The plurality of cooling fins 44 are uniformly distributed at the side surface of the support outer ring 43 and arranged around the heat dissipation ring 42. The connecting strips 45 are provided with six connecting strips.

[0032] In the above technical solution: the cooling water channel on the stator support 4 is distributed on the support inner ring 41, the connecting strip 45, the heat dissipation ring 42 and the support outer ring 43, the water channel in the support outer ring 43 is communicated with the water channel in the heat dissipation fin 44, the water channel in the support outer ring 43 and the water channel in the heat dissipation ring 42 are communicated with the water channel in the connecting strip 45, the water channel in the connecting strip 45 is communicated with the water channel in the support inner ring 41, the water channel in the support inner ring 41 is communicated with the water channel in the mandrel 8, the water channel in the mandrel 8 is communicated with the mandrel water inlet 81 and the mandrel water outlet 82, and the water channel in the support outer ring 43 and the water channel in the heat dissipation ring 42 are separated from each other. After the cooling liquid is introduced from the mandrel water inlet 81, it flows through the mandrel 8, the support inner ring 41, the connecting strip 45, the heat dissipation ring 42 and is finally discharged through the mandrel water outlet 82, forming a complete cooling water channel; after the cooling liquid is introduced from the mandrel water inlet 81, it flows through the mandrel 8, the support inner ring 41, the connecting strip 45, the support outer ring 43 and the heat dissipation fin 44 and is finally discharged through the mandrel water outlet 82, forming a second complete cooling water channel, and the two cooling water channels simultaneously perform cooling, increase the heat exchange contact area, enhance the heat exchange effect, and make the cooling liquid more effectively and rapidly take away the heat generated during the operation of the motor.

[0033] In the above technical solution: the two ends of the mandrel 8 are internally hollow, and the cooling water channel includes a plurality of water inlet passages 83, a plurality of water outlet passages 84, a plurality of water inlet hole groups and a plurality of water outlet hole groups located in the middle section of the mandrel 8. The water inlet passage 83 is communicated with the mandrel water inlet 81, and the water outlet passage 84 is communicated with the mandrel water outlet 82. The water inlet hole group is communicated with the water inlet passage 83, and the water outlet hole group is communicated with the water outlet passage 84. The water inlet hole group includes a plurality of first water inlet through holes 85 and a plurality of second water inlet through holes 86, and the water outlet hole group includes a plurality of first water outlet through holes 87 and a plurality of second water outlet through holes 88. As shown in Figure 6 、 7 The water inlet passage 83 and the water outlet passage 84 are each provided with three groups. The water inlet hole group is provided with three groups in total, and each group of the water inlet hole group includes two first water inlet through holes 85 and one second water inlet through hole 86; the water outlet hole group is also provided with three groups, and each group of the water outlet hole group includes two first water outlet through holes 87 and one second water outlet through hole 88. The three groups of water inlet hole groups and the three groups of water outlet hole groups are alternately arranged.

[0034] In the above technical solution: the cooling water channel further includes a plurality of first support water inlet passages 47, a plurality of second support water inlet passages 48, a plurality of first support water outlet passages 49 and a plurality of second support water outlet passages 410 penetrating through the support inner ring 41 and the connecting strip 45. The first support water inlet passage 47 is communicated with the first water inlet through hole 85, the second support water inlet passage 48 is communicated with the second water inlet through hole 86, the first support water outlet passage 49 is communicated with the first water outlet through hole 87, and the second support water outlet passage 410 is communicated with the second water outlet through hole 88.

[0035] The technical scheme is characterized in that: the cooling water channel further comprises a plurality of heat dissipation water inlets 421, a plurality of heat dissipation water outlets 422 and two groups of heat dissipation water channels 423 located in the heat dissipation ring 42. The heat dissipation water inlets 421 are communicated with the first support water inlet passages 47, and the heat dissipation water outlets 422 are communicated with the first support water outlet passages 49. The two groups of heat dissipation water channels 423 are arranged in parallel and are separated from each other and are not communicated with each other. The two groups of heat dissipation water channels 423 are both communicated with different heat dissipation water inlets 421 and different heat dissipation water outlets 422, so as to ensure that the inner and outer circumferential surfaces of the heat dissipation ring 42 can play a role in heat dissipation.

[0036] The technical scheme is characterized in that: the heat dissipation ring 42 further comprises a plurality of guide vanes 46. The guide vanes 46 are triangular. The guide vanes 46 are located in the heat dissipation water inlets 421 and the heat dissipation water outlets 422. The cooling liquid flowing into the heat dissipation water inlets 421 is divided by the guide vanes 46 and then moves to the heat dissipation water channels 423 located on both sides of the guide vanes 46. The guide vanes 46 play a role in dividing the cooling liquid, reduce the degree of turbulence of the water flow, improve the efficiency of heat exchange, and reduce the water flow resistance. The guide vanes 46 can also be arranged in other cooling water channels, such as the first support water inlet passages 47, the plurality of second support water inlet passages 48, the plurality of first support water outlet passages 49 and the plurality of second support water outlet passages 410.

[0037] The technical scheme is characterized in that: as shown in Figure 7 The cooling water channel comprises a plurality of support water inlets 431, a plurality of support water outlets 432, a first support water channel 433 and a plurality of second support water channels 434 located in the support outer ring 43. The support water inlets 431 are communicated with the second support water inlet passages 48 in the connecting strips 45, and the support water outlets 432 are communicated with the second support water outlet passages 410 in the connecting strips 45. The first support water channel 433 is communicated with all the support water outlets 432. The plurality of second support water channels 434 are arranged in parallel and are separated from each other, and each second support water channel 434 is communicated with the support water inlets 431. As shown in Figure 5 The U-shaped communication water channel 441 is arranged in the heat dissipation fins 44 located on the side surface of the support outer ring 43. The two ends of the communication water channel 441 are communicated with the first support water channel 433 and the second support water channel 434, respectively. The communication water channel 441 located in the heat dissipation fins 44 can quickly take away a large amount of heat generated by the winding 2, and the heat dissipation is more efficient, which significantly improves the heat dissipation efficiency of the motor.

[0038] The cooling liquid is introduced from the core shaft water inlet 81, passes through the water inlet channel 83 in the core shaft 8, and flows to the first support water inlet channel 47 through the first water inlet through hole 85 and to the second support water inlet channel 48 through the second water inlet through hole 86; the cooling liquid in the first support water inlet channel 47 enters the heat dissipation ring 42 through the heat dissipation water inlet hole 421, is divided into two parts by the guide vane 46 and enters the heat dissipation water channel 423, then flows through the heat dissipation water outlet hole 422, the first support water outlet channel 49, the first water outlet through hole 87, the water outlet channel 84, and finally is discharged through the core shaft water outlet 82; the cooling liquid in the second support water inlet channel 48 enters all the second support water channels 434 in the support outer ring 43 through the support water inlet hole 431, enters the first support water channel 433 through the connecting water channel 441 in the heat dissipation fin 44, then flows through the support water outlet hole 432, the second support water outlet channel 410, the second water outlet through hole 88, the water outlet channel 84, and finally is discharged through the core shaft water outlet 82.

[0039] In the above technical solution: the water cooling radiator is further included, the water outlet of the water cooling radiator is connected with the core shaft water inlet 81, the water inlet of the water cooling radiator is connected with the core shaft water outlet 82, and the water discharged from the core shaft water outlet 82 is cooled by the water cooling radiator and then introduced into the core shaft water inlet 81, thereby forming a forced liquid cooling circulation structure, which is energy-saving and environmentally friendly. The water cooling radiator can be directly purchased from the market. The cooling liquid can be selected from water, ethylene glycol solution, cooling oil and the like, and the non-magnetic and non-conductive cooling oil is the best.

[0040] In the above technical solution: the heat dissipation ring 42 and the connecting strip 45 are fixed by welding, and the heat dissipation fin 44 and the support outer ring 43 are also fixed by welding. The heat dissipation fin 44 and the support outer ring 43 can also be integrally formed.

[0041] In the above technical solution: the connection positions of the cooling water channels between the stator support 4 and the core shaft 8 and between the stator support 4 and the heat dissipation fin 44 are sealed by sealing glue to prevent the cooling liquid from leaking outwards from the contact gaps. The connection positions of the cooling water channels between the heat dissipation ring 42 and the connecting strip 45 in the stator support 4 are also sealed by sealing glue.

[0042] In the above technical solution: the winding 2 is specifically a flat wire winding. Compared with the traditional round wire winding, the flat wire winding has a higher slot fill rate, and the flat wire winding has a better fit with the stator core 3 and a smaller thermal resistance, which is beneficial to the heat transfer from the winding 2 to the stator core 3 and then to the air, thereby effectively reducing the temperature rise of the motor and improving the reliability and service life of the motor.

[0043] In the above technical solution: further comprising a rotor 1 and end covers 5 located on both sides of the rotor 1, the rotor 1 is sleeved on the stator core 3, and the inner circumferential surface of the rotor 1 is pasted with a plurality of permanent magnets. Two end covers 5 are fixed on the two side surfaces of the rotor 1 through a plurality of screws 6. The motor in the application is specifically a brushless permanent magnet synchronous flat wire hub motor.

[0044] The preferred embodiments of the application are described in detail above. It should be understood that those of ordinary skill in the art can make many modifications and changes without creative work based on the concept of the present application. Therefore, any technical solution obtained by logical analysis, reasoning or limited experiment based on the prior art within the technical field of those skilled in the art according to the concept of the present application shall fall within the protection scope of the present application.

Claims

1. A heat dissipation device of an in-wheel motor, comprising a mandrel (8), a stator support (4), and a stator core (3), the stator support (4) being fixedly sleeved on the mandrel (8), and the stator core (3) comprising a plurality of stator teeth, the stator teeth being wound with windings (2), characterized in that The stator support (4) is provided with a plurality of cooling fins (44), and the two ends of the mandrel (8) are respectively provided with a mandrel water inlet (81) for entering cooling liquid and a mandrel water outlet (82) for discharging cooling liquid. Cooling channels are arranged in the mandrel (8), the stator support (4) and the cooling fins (44), and the two ends of the cooling channels are respectively communicated with the mandrel water inlet (81) and the mandrel water outlet (82). The stator core (3) is nested on the stator support (4), so that the stator teeth are located between two adjacent cooling fins (44), and the winding (2) is in direct or indirect contact with the cooling fins (44). The stator support (4) comprises a support inner ring (41), a heat dissipation ring (42), a support outer ring (43) and a plurality of connecting strips (45). The support inner ring (41) is sleeved and fixed on the mandrel (8). The support outer ring (43) is fixedly connected with the support inner ring (41) through a plurality of connecting strips (45). The heat dissipation ring (42) is sleeved on the connecting strips (45) and located on the side of the support outer ring (43). A plurality of cooling fins (44) are uniformly distributed on the side of the support outer ring (43) and arranged around the heat dissipation ring (42). The cooling channels on the stator support (4) are arranged in the support inner ring (41), the connecting strips (45), the heat dissipation ring (42) and the support outer ring (43). The water channels in the support outer ring (43) are communicated with the water channels in the cooling fins (44). The water channels in the support outer ring (43) and the heat dissipation ring (42) are communicated with the water channels in the connecting strips (45). The water channels in the connecting strips (45) are communicated with the water channels in the support inner ring (41). The water channels in the support inner ring (41) are communicated with the water channels in the mandrel (8). The water channels in the mandrel (8) are communicated with the mandrel water inlet (81) and the mandrel water outlet (82). The water channels in the support outer ring (43) and the heat dissipation ring (42) are separated from each other. After the cooling liquid enters the mandrel water inlet (81), it flows through the mandrel (8), the support inner ring (41), the connecting strips (45) and the heat dissipation ring (42), and is finally discharged through the mandrel water outlet (82), forming a complete cooling channel. After the cooling liquid enters the mandrel water inlet (81), it flows through the mandrel (8), the support inner ring (41), the connecting strips (45), the support outer ring (43) and the cooling fins (44), and is finally discharged through the mandrel water outlet (82), forming a second complete cooling channel. The two cooling channels simultaneously perform cooling.

2. The heat dissipation device of a wheel hub motor according to claim 1, characterized in that The cooling water channel comprises a plurality of support water inlet holes (431), a plurality of support water outlet holes (432), a first support water channel (433) and a plurality of second support water channels (434) in the outer ring (43) of the support, the support water inlet holes (431) and the support water outlet holes (432) are communicated with the water channel in the connecting strip (45), the first support water channel (433) is communicated with all the support water outlet holes (432), the plurality of second support water channels (434) are arranged separately from each other and each of the second support water channels (434) is communicated with the support water inlet hole (431), a U-shaped communication water channel (441) is formed in the cooling fin (44), and two ends of the communication water channel (441) are communicated with the first support water channel (433) and the second support water channel (434) respectively.

3. The heat dissipation device of a wheel hub motor according to claim 2, characterized in that The two end portions of the mandrel (8) are hollow, and the cooling water channel comprises a plurality of water inlet channels (83), a plurality of water outlet channels (84), a plurality of water inlet hole groups and a plurality of water outlet hole groups in the middle section of the mandrel (8), the water inlet channels (83) are communicated with the mandrel water inlet (81), the water outlet channels (84) are communicated with the mandrel water outlet (82), the water inlet hole groups are communicated with the water inlet channels (83), the water outlet hole groups are communicated with the water outlet channels (84), the water inlet hole groups comprise a plurality of first water inlet through holes (85) and a plurality of second water inlet through holes (86), and the water outlet hole groups comprise a plurality of first water outlet through holes (87) and a plurality of second water outlet through holes (88).

4. The heat dissipation device of a wheel hub motor according to claim 3, characterized in that The cooling water channel further comprises a plurality of first support water inlet channels (47), a plurality of second support water inlet channels (48), a plurality of first support water outlet channels (49) and a plurality of second support water outlet channels (410) penetrating through the inner ring (41) of the support and the connecting strip (45), the first support water inlet channels (47) are communicated with the first water inlet through holes (85) correspondingly, the second support water inlet channels (48) are communicated with the second water inlet through holes (86) and the support water inlet holes (431), the first support water outlet channels (49) are communicated with the first water outlet through holes (87), and the second support water outlet channels (410) are communicated with the second water outlet through holes (88) and the support water outlet holes (432).

5. The heat dissipation device of a wheel hub motor according to claim 4, characterized in that The cooling water channel further comprises a plurality of heat dissipation water inlet holes (421), a plurality of heat dissipation water outlet holes (422) and two groups of heat dissipation water channels (423) in the heat dissipation ring (42), the heat dissipation water inlet holes (421) are communicated with the first support water inlet channels (47), the heat dissipation water outlet holes (422) are communicated with the first support water outlet channels (49), and the two groups of heat dissipation water channels (423) are arranged separately side by side, and the two groups of heat dissipation water channels (423) are communicated with different heat dissipation water inlet holes (421) and different heat dissipation water outlet holes (422).

6. The heat dissipation device of a wheel hub motor according to claim 5, characterized in that The heat dissipation ring (42) is internally provided with a plurality of guide vanes (46), the guide vanes (46) are located in the heat dissipation water inlet hole (421) and the heat dissipation water outlet hole (422), and the cooling liquid flowing into the heat dissipation water inlet hole (421) is divided into two parts by the guide vanes (46) and then moves to the heat dissipation water channel (423) on both sides of the guide vanes (46).

7. The heat dissipation device of a wheel hub motor according to claim 5, characterized in that The water inlet channel (83) and the water outlet channel (84) are each provided with three groups, the water inlet hole group is provided with three groups, each of the water inlet hole groups comprises two first water inlet through holes (85) and one second water inlet through hole (86), the water outlet hole group is also provided with three groups, each of the water outlet hole groups comprises two first water outlet through holes (87) and one second water outlet through hole (88), and the three groups of water inlet hole groups and the three groups of water outlet hole groups are alternately arranged.

8. The heat dissipation device of a wheel hub motor according to claim 1, characterized in that The water cooling radiator is further connected with the water outlet of the water cooling radiator and the water inlet of the mandrel (81), and the water inlet of the water cooling radiator is connected with the water outlet of the mandrel (82).

9. The heat dissipation device of a wheel hub motor according to claim 1, characterized in that The heat dissipation ring (42) and the connecting strip (45) and the heat dissipation fin (44) and the support outer ring (43) are fixed by welding.

10. The heat dissipation device of a wheel hub motor according to claim 1, characterized in that When the winding (2) is indirectly in contact with the heat dissipation fin (44), a heat conduction medium is arranged between the winding (2) and the heat dissipation fin (44).

11. The heat dissipation device of a wheel hub motor according to claim 1, characterized in that The cooling water channel connection between the stator support (4) and the mandrel (8) and the cooling water channel connection between the stator support (4) and the heat dissipation fin (44) are sealed by sealing glue.

12. The heat dissipation device of a wheel hub motor according to claim 1, characterized in that The winding (2) is a flat wire winding.

13. The heat dissipation device of a wheel hub motor according to claim 1, characterized in that The rotor (1) and the end cover (5) located on both sides of the rotor (1) are further included, the rotor (1) is sleeved on the stator core (3), the inner circumferential surface of the rotor (1) is attached with a plurality of permanent magnets, and the two end covers (5) are respectively fixed on the two side surfaces of the rotor (1) through a plurality of screws (6).

Images