Radiating device of hub motor

Abstract

The invention relates to a heat dissipation device of a hub motor, which comprises a mandrel, a stator support and 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, the heat dissipation device further comprises a plurality of cooling water channels, and a plurality of cooling fins are arranged on the side surface of the stator support. The two ends of the core shaft are provided with a core shaft water inlet used for leading in cooling liquid and a core shaft water outlet used for discharging the cooling liquid respectively, the cooling water channels are distributed in the core shaft, the stator support and the cooling fins, the two ends of the cooling water channels are communicated with the core shaft water inlet and the core shaft water outlet respectively, and the stator iron core is nested on the stator support. The stator teeth are located between two adjacent radiating fins, and the winding and the radiating fins are in direct contact or indirect contact. The cooling water channels are arranged in the mandrel, the stator support and the cooling fins, so that the motor can be integrally cooled, the cooling area is large, the cooling effect is good, the temperature of the motor is reduced, and the efficiency of the motor is improved.

Description

Technical Field

[0001] The invention relates to a heat dissipation device for a hub motor, and belongs to the technical field of hub motors. Background Art

[0002] In-wheel hub motors are widely used in various fields, including electric vehicles. However, as power increases and operating conditions become more complex, heat dissipation becomes a critical issue. During operation, the windings, core, and permanent magnets generate significant heat. Traditional natural cooling and air cooling methods, due to low efficiency and structural limitations, are unable to meet the heat dissipation requirements of high-power motors. Existing liquid cooling solutions also have issues with coolant distribution, heat exchange, and sealing. As a result, in-wheel hub motors lack efficient and reliable heat dissipation devices, failing to meet the motor's heat dissipation requirements. Summary of the Invention

[0003] The purpose of the present invention is to provide a heat dissipation device for a hub motor with good heat dissipation effect in view of the shortcomings of the prior art.

[0004] To achieve the purpose, the present invention adopts the following technical solutions: A heat dissipation device for a hub motor includes a core shaft, a stator bracket, and a stator core. The stator bracket is sleeved and fixed on the core shaft. The stator core includes a plurality of stator teeth with windings wound on the stator teeth. The stator core also includes a plurality of cooling water channels. The side of the stator bracket is provided with a plurality of heat sinks. The two ends of the core shaft are respectively provided with a core shaft water inlet for introducing coolant and a core shaft water outlet for discharging coolant. The cooling water channels are distributed in the core shaft, the stator bracket, and the heat sinks. The two ends of the cooling water channels are respectively connected to the core shaft water inlet and the core shaft water outlet. The stator core is nested in the stator bracket so that the stator teeth are located between two adjacent heat sinks. The windings are in direct or indirect contact with the heat sinks.

[0005] As a further optimization of the above technical solution: the stator bracket includes a bracket inner ring, a heat dissipation ring, a bracket outer ring and a plurality of connecting strips, the bracket inner ring is sleeved and fixed on the core shaft, the bracket outer ring and the bracket inner ring are fixedly connected by a plurality of the connecting strips, the heat dissipation ring is sleeved on the connecting strips and is located on the side of the bracket outer ring, and a plurality of heat dissipation fins are evenly distributed on the side of the bracket outer ring and arranged around the heat dissipation ring.

[0006] As a further optimization of the above technical solution: the cooling water channels on the stator bracket are distributed on the bracket inner ring, the connecting strip, the heat dissipation ring and the bracket outer ring, the water channels in the bracket outer ring are connected with the water channels in the heat sink, the water channels in the bracket outer ring and the water channels in the heat dissipation ring are both connected with the water channels in the connecting strip, the water channels in the connecting strip are connected with the water channels in the bracket inner ring, the water channels in the bracket inner ring are connected with the water channels in the core shaft, the water channels in the core shaft are connected with the core shaft water inlet and the core shaft water outlet, and the water channels in the bracket outer ring and the water channels in the heat dissipation ring are separated from each other.

[0007] As a further optimization of the above technical solution: after the coolant is introduced from the water inlet of the core shaft, it flows through the core shaft, the inner ring of the bracket, the connecting strip, the heat dissipation ring, and is finally discharged through the water outlet of the core shaft to form a complete cooling water channel; after the coolant is introduced from the water inlet of the core shaft, it flows through the core shaft, the inner ring of the bracket, the connecting strip, the outer ring of the bracket, the heat dissipation fin, and is finally discharged through the water outlet of the core shaft to form a second complete cooling water channel, and the two cooling water channels are cooled simultaneously.

[0008] As a further optimization of the above technical solution: the cooling water channel includes a number of bracket water inlet holes, a number of bracket water outlet holes, a first bracket water channel and multiple second bracket water channels located in the outer ring of the bracket, the bracket water inlet holes and the bracket water outlet holes are connected to the water channel in the connecting strip, the first bracket water channel is connected to all the bracket water outlet holes, the multiple second bracket water channels are separated from each other and each second bracket water channel is connected to the bracket water inlet hole, a U-shaped connecting water channel is made in the heat sink, and the two ends of the connecting water channel are respectively connected to the first bracket water channel and the second bracket water channel.

[0009] As a further optimization of the above technical solution: the two ends of the core shaft are hollow, and the cooling water channel includes a number of water inlet channels, a number of water outlet channels, a number of water inlet hole groups and a number of water outlet hole groups located in the middle section of the core shaft, the water inlet channel is connected to the water inlet of the core shaft, the water outlet channel is connected to the water outlet of the core shaft, the water inlet hole group is connected to the water inlet channel, the water outlet hole group is connected to the water outlet channel, the water inlet hole group includes a number of first water inlet holes and a number of second water inlet holes, and the water outlet hole group includes a number of first water outlet holes and a number of second water outlet holes.

[0010] As a further optimization of the above technical solution: the cooling water channel also includes several first bracket water inlet channels, several second bracket water inlet channels, several first bracket water outlet channels and several second bracket water outlet channels that pass through the inner ring of the bracket and the connecting strip. The first bracket water inlet channel is correspondingly connected to the first water inlet through-hole, the second bracket water inlet channel is connected to the second water inlet through-hole and the bracket water inlet hole, the first bracket water outlet channel is connected to the first water outlet through-hole, and the second bracket water outlet channel is connected to the second water outlet through-hole and the bracket water outlet hole.

[0011] As a further optimization of the above technical solution: the cooling water channel also includes 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 connected to the water inlet channel of the first bracket, the heat dissipation water outlet holes are connected to the water outlet channel of the first bracket, the two groups of heat dissipation water channels are arranged in parallel and separated, and the two groups of heat dissipation water channels are connected to different heat dissipation water inlet holes and different heat dissipation water outlet holes.

[0012] As a further optimization of the above technical solution: a plurality of guide plates are further provided inside the heat dissipation ring, and the guide plates are located in the heat dissipation water inlet and the heat dissipation water outlet. The coolant entering the heat dissipation water inlet is diverted by the guide plates and moves to the heat dissipation water channels located on both sides of the guide plates.

[0013] As a further optimization of the above technical solution: the water inlet channel and the water outlet channel are each provided with three groups, and the water inlet hole groups are provided with three groups in total, each group of the water inlet hole groups includes two of the first water inlet holes and one of the second water inlet holes; the water outlet hole groups are also provided with three groups, each group of the water outlet hole groups includes two of the first water outlet holes and one of the second water outlet holes, and the three groups of the water inlet hole groups and the three groups of the water outlet hole groups are alternately distributed.

[0014] As a further optimization of the above technical solution: it also includes a water-cooled radiator, the water outlet of the water-cooled radiator is connected to the water inlet of the core shaft, and the water inlet of the water-cooled radiator is connected to the water outlet of the core shaft.

[0015] As a further optimization of the above technical solution: the heat dissipation ring and the connecting strip, and the heat dissipation fin and the outer ring of the bracket are fixed by welding.

[0016] As a further optimization of the above technical solution: when the winding is in indirect contact with the heat sink, a heat conduction medium is provided between the winding and the heat sink.

[0017] As a further optimization of the above technical solution: the cooling water channel connection between the stator bracket and the core shaft, and the cooling water channel connection between the stator bracket and the heat sink are both sealed by sealant.

[0018] As a further optimization of the above technical solution: the winding is a flat wire winding.

[0019] As a further optimization of the above technical solution: it also includes a rotor and end covers located on both sides of the rotor, the rotor is sleeved on the stator core, a plurality of permanent magnets are pasted on the inner circumference of the rotor, and the two end covers are fixed to the two side surfaces of the rotor by a plurality of screws respectively.

[0020] The heat dissipation effect is better than that of the heat dissipation plate in the heat dissipation device, and the heat dissipation device is installed in the heat dissipation device to dissipate heat from the heat dissipation device, thereby improving the heat dissipation efficiency of the motor. The heat exchange contact area is increased, the heat exchange effect is enhanced, the coolant is more effective, and the heat generated during motor operation is quickly taken away; there are two sets of heat dissipation water channels that are separated and arranged in parallel and not connected to each other in the heat dissipation ring to ensure that the inner and outer surfaces of the heat dissipation ring can play a role in heat dissipation; the guide vane plays a role in diverting the coolant, reducing the turbulence of the water flow, improving the efficiency of heat exchange, and reducing water flow resistance; the water-cooled radiator realizes liquid cooling circulation, energy saving and environmental protection, and solves the problems of coolant inlet and drainage; the sealant ensures the sealing between the cooling water channel joints to prevent the coolant from leaking out from the gap; the winding is specifically a flat wire winding, which has a higher slot fill rate than the traditional round wire winding, and the flat wire winding has a better fit with the stator core and a smaller thermal resistance, which is conducive 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 THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0022] Figure 2 It is a schematic diagram of the explosion structure of the present invention.

[0023] Figure 3 It is a schematic diagram of the exploded structure of the stator bracket and the stator core in the present invention.

[0024] Figure 4 It is a schematic diagram of the cross-sectional structure of the present invention.

[0025] Figure 5 It is another cross-sectional structural schematic diagram of the present invention.

[0026] Figure 6 It is another cross-sectional structural schematic diagram of the present invention.

[0027] Figure 7 It is another cross-sectional structural schematic diagram of the present invention.

[0028] In the figure: 1. rotor; 2. winding; 3. stator core; 4. stator bracket; 41. bracket inner ring; 42. heat dissipation ring; 421. heat dissipation water inlet; 422. heat dissipation water outlet; 423. heat dissipation water channel; 43. bracket outer ring; 431. bracket water inlet; 432. bracket water outlet; 433. first bracket water channel; 434. second bracket water channel; 44. heat sink; 441. connecting water channel; 45. connecting strip; 46. ​​Guide plate; 47. Water inlet channel of the first bracket; 48. Water inlet channel of the second bracket; 49. Water outlet channel of the first bracket; 410. Water outlet channel of the second bracket; 5. End cover; 6. Screw; 8. Mandrel; 81. Mandrel water inlet; 82. Mandrel water outlet; 83. Water inlet channel; 84. Water outlet channel; 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

[0029] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Figure 1-7As shown, a heat dissipation device for a hub motor includes a core shaft 8, a stator bracket 4, a stator core 3, and several cooling water channels. The stator bracket 4 is sleeved and fixed on the core shaft 8. The stator bracket 4 and the core shaft 8 can be positioned and installed by keyways or directly welded. The side of the stator bracket 4 is provided with multiple cooling fins 44. The ends of the core shaft 8 are respectively provided with a core shaft inlet 81 for introducing coolant and a core shaft outlet 82 for discharging coolant. Cooling water channels are distributed within the core shaft 8, the stator bracket 4, and the cooling fins 44. The ends of the cooling water channels are connected to the core shaft inlet 81 and the core shaft outlet 82 respectively. The stator core 3 includes multiple stator teeth, each of which is wound with windings 2. The stator core 3 is nested in the stator bracket 4, so that the stator teeth are located between two adjacent cooling fins 44. The windings 2 are in direct or indirect contact with the cooling fins 44. When in indirect contact, a heat conduction medium is set between the winding 2 and the heat sink 44 to enhance heat conduction. The heat conduction medium can be selected from thermal grease, graphene thermal conductive sheet, thermal adhesive, PCM phase change material, etc. to assist the heat transfer process from the winding 2 to the heat sink 44. The cooling water channel in the core shaft 8, the stator bracket 4 and the heat sink 44 can dissipate heat for the motor as a whole. The heat dissipation area is large, the heat dissipation effect is good, and the temperature of the motor is reduced, thereby providing strong support for further optimization of the motor performance, ensuring that the motor can maintain a stable and excellent working state under high load operation, and improving the efficiency of the motor. In addition to fixing the stator core 3, the stator bracket 4 also plays a role in cooling the motor, reducing the temperature of the motor and improving the efficiency of the motor. The setting of the heat sink 44 makes full use of the space between two adjacent stator teeth. The cooling water channel in the heat sink 44 can better take away the heat generated by the winding 2, ensuring rapid heat dissipation of the winding 2.

[0030] In the above technical solution, the stator support 4 includes an inner ring 41, a heat dissipation ring 42, an outer ring 43, and a plurality of connecting bars 45. The inner ring 41 is sleeved and fixed on the core shaft 8. The outer ring 43 is fixedly connected to the inner ring 41 via a plurality of connecting bars 45. The heat dissipation ring 42 is sleeved on the connecting bars 45 and located on the side of the outer ring 43. A plurality of heat dissipation fins 44 are evenly distributed on the side of the outer ring 43 and are arranged around the heat dissipation ring 42. There are six connecting bars 45 in total.

[0031] In the above technical solution: the cooling water channels on the stator bracket 4 are distributed on the bracket inner ring 41, the connecting strip 45, the heat dissipation ring 42 and the bracket outer ring 43. The water channels in the bracket outer ring 43 are connected to the water channels in the heat sink 44. The water channels in the bracket outer ring 43 and the water channels in the heat dissipation ring 42 are both connected to the water channels in the connecting strip 45. The water channels in the connecting strip 45 are connected to the water channels in the bracket inner ring 41. The water channels in the bracket inner ring 41 are connected to the water channels in the core shaft 8. The water channels in the core shaft 8 are connected to the core shaft water inlet 81 and the core shaft water outlet 82. The water channels in the bracket outer ring 43 and the water channels in the heat dissipation ring 42 are separated from each other. After the coolant enters the core shaft water inlet 81, it flows through the core shaft 8, the inner ring of the bracket 41, the connecting strip 45, the heat dissipation ring 42, and is finally discharged through the core shaft water outlet 82, forming a complete cooling water channel; after the coolant enters the core shaft water inlet 81, it flows through the core shaft 8, the inner ring of the bracket 41, the connecting strip 45, the outer ring of the bracket 43, the heat dissipation fin 44, and is finally discharged through the core shaft water outlet 82, forming a second complete cooling water channel. The two cooling water channels are cooled at the same time, which increases the heat exchange contact area, enhances the heat exchange effect, makes the coolant more effective, and quickly takes away the heat generated when the motor is running.

[0032] In the above technical solution: the two ends of the core shaft 8 are internal cavities, and the cooling water channel includes a number of water inlet channels 83, a number of water outlet channels 84, a number of water inlet hole groups and a number of water outlet hole groups located in the middle section of the core shaft 8. The water inlet channel 83 is connected to the core shaft water inlet 81, and the water outlet channel 84 is connected to the core shaft water outlet 82. The water inlet hole group is connected to the water inlet channel 83, and the water outlet hole group is connected to the water outlet channel 84. The water inlet hole group includes a number of first water inlet through holes 85 and a number of second water inlet through holes 86, and the water outlet hole group includes a number of first water outlet through holes 87 and a number of second water outlet through holes 88. As shown Figure 6 、 7 As shown, there are three groups of water inlet channels 83 and water outlet channels 84. There are three groups of water inlet holes, each including two first water inlet holes 85 and one second water inlet hole 86. There are also three groups of water outlet holes, each including two first water outlet holes 87 and one second water outlet hole 88. The three groups of water inlet holes and the three groups of water outlet holes are arranged alternately.

[0033] In the above technical solution, the cooling water channel also includes a plurality of first bracket water inlet channels 47, a plurality of second bracket water inlet channels 48, a plurality of first bracket water outlet channels 49, and a plurality of second bracket water outlet channels 410, which extend through the bracket inner ring 41 and the connecting strip 45. The first bracket water inlet channels 47 are connected to the first water inlet through-holes 85, the second bracket water inlet channels 48 are connected to the second water inlet through-holes 86, the first bracket water outlet channels 49 are connected to the first water outlet through-holes 87, and the second bracket water outlet channels 410 are connected to the second water outlet through-holes 88.

[0034] In the above technical solution, the cooling water channel also includes multiple cooling water inlet holes 421, multiple cooling water outlet holes 422, and two sets of cooling water channels 423 located within the heat dissipation ring 42. The cooling water inlet holes 421 communicate with the first bracket water inlet channel 47, while the cooling water outlet holes 422 communicate with the first bracket water outlet channel 49. The two sets of cooling water channels 423 are arranged in parallel and separated, but not interconnected. Each set of cooling water channels 423 connects to different cooling water inlet holes 421 and different cooling water outlet holes 422, ensuring that heat dissipation can be achieved on both the inner and outer circumferences of the heat dissipation ring 42.

[0035] In the above technical solution, a plurality of triangular guide vanes 46 are provided inside the heat dissipation ring 42. The guide vanes 46 are located within the heat dissipation water inlet 421 and the heat dissipation water outlet 422. The coolant entering the heat dissipation water inlet 421 is diverted 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 serve to divert the coolant, reduce the turbulence of the water flow, improve the efficiency of heat exchange, and reduce water flow resistance. The guide vanes 46 can also be provided in other cooling water channels, such as the water inlets of the first bracket water inlet channel 47, the plurality of second bracket water inlet channels 48, the plurality of first bracket water outlet channels 49, and the plurality of second bracket water outlet channels 410.

[0036] In the above technical solution: Figure 7 As shown, the cooling water channel includes a plurality of bracket water inlet holes 431, a plurality of bracket water outlet holes 432, a first bracket water channel 433 and a plurality of second bracket water channels 434 located in the bracket outer ring 43. The bracket water inlet hole 431 is connected to the second bracket water inlet channel 48 in the connecting strip 45, and the bracket water outlet hole 432 is connected to the second bracket water outlet channel 410 in the connecting strip 45. The first bracket water channel 433 is connected to all the bracket water outlet holes 432, and the plurality of second bracket water channels 434 are separated from each other and each second bracket water channel 434 is connected to the bracket water inlet hole 431. Figure 5 As shown, a U-shaped connecting water channel 441 is formed in the heat sink 44 located on the side of the bracket outer ring 43. The two ends of the connecting water channel 441 are respectively connected to the first bracket water channel 433 and the second bracket water channel 434. The connecting water channel 441 located in the heat sink 44 can quickly remove the large amount of heat generated by the winding 2, dissipating heat more efficiently and significantly improving the heat dissipation efficiency of the motor.

[0037] The coolant enters the core shaft water inlet 81, passes through the water inlet channel 83 in the core shaft 8, and flows to the first bracket water inlet channel 47 through the first water inlet hole 85, and flows to the second bracket water inlet channel 48 through the second water inlet hole 86; the coolant in the first bracket water inlet channel 47 enters the heat dissipation ring 42 through the heat dissipation water inlet hole 421, is divided to both sides by the guide plate 46 and enters the heat dissipation water channel 423, and then flows through the heat dissipation water outlet hole 422, the first bracket water outlet channel 49, the first outlet hole 43, and the second bracket water outlet hole 44. The coolant in the second bracket water inlet channel 48 enters all the second bracket water channels 434 in the bracket outer ring 43 through the bracket water inlet hole 431, and enters the first bracket water channel 433 through the connecting water channel 441 in the heat sink 44, and then flows through the bracket water outlet hole 432, the second bracket 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.

[0038] The above technical solution also includes a water-cooled radiator. The water outlet of the water-cooled radiator is connected to the mandrel water inlet 81, and the water inlet of the water-cooled radiator is connected to the mandrel water outlet 82. Water discharged from the mandrel water outlet 82 is cooled by the water-cooled radiator and then introduced into the mandrel water inlet 81, thereby forming a forced liquid cooling circulation structure, which is energy-saving and environmentally friendly. The water-cooled radiator can be purchased directly from the market. The coolant can be water, ethylene glycol water solution, or cooling oil, with non-magnetic and non-conductive cooling oil being the most preferred.

[0039] In the above technical solution, the heat dissipation ring 42 and the connecting strip 45, and the heat dissipation fins 44 and the bracket outer ring 43 are fixed by welding. The heat dissipation fins 44 and the bracket outer ring 43 can also be integrally formed.

[0040] In the above technical solution, the cooling water channel connections between the stator bracket 4 and the core shaft 8, and between the stator bracket 4 and the cooling fins 44, are sealed with sealant to prevent coolant from leaking out through the contact gaps. The cooling water channel connection between the heat dissipation ring 42 and the connecting bar 45 within the stator bracket 4 is also sealed with sealant.

[0041] In the above technical solution: winding 2 is specifically a flat wire winding. Compared with traditional round wire winding, 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 conducive to the transfer of heat from winding 2 to the stator core 3 and then dissipation, thereby effectively reducing the temperature rise of the motor and improving the reliability and service life of the motor.

[0042] The above technical solution also includes a rotor 1 and end caps 5 located on either side of the rotor 1. The rotor 1 is mounted on the stator core 3, and a plurality of permanent magnets are attached to the inner circumference of the rotor 1. The two end caps 5 are fixed to the two sides of the rotor 1 by a plurality of screws 6. The motor in this application is specifically a brushless permanent magnet synchronous flat wire hub motor.

[0043] The above describes in detail the preferred embodiments of the present invention. It should be understood that those skilled in the art can make numerous modifications and variations based on the concepts of the present invention without inventive effort. Therefore, any technical solutions that can be derived by those skilled in the art through logical analysis, reasoning, or limited experimentation based on the concepts of the present invention and the prior art should fall within the scope of protection of the present invention.

Claims

1. A heat dissipation device for a hub motor, comprising a core shaft (8), a stator bracket (4), and a stator core (3), wherein the stator bracket (4) is sleeved and fixed on the core shaft (8), and the stator core (3) comprises a plurality of stator teeth, and windings (2) are wound around the stator teeth, characterized in that The invention also includes a plurality of cooling water channels. The side of the stator bracket (4) is provided with a plurality of heat sinks (44). The two ends of the core shaft (8) are respectively provided with a core shaft water inlet (81) for introducing the coolant and a core shaft water outlet (82) for discharging the coolant. The cooling water channels are distributed in the core shaft (8), the stator bracket (4) and the heat sink (44). The two ends of the cooling water channels are respectively connected with the core shaft water inlet (81) and the core shaft water outlet (82). The stator core (3) is nested on the stator bracket (4) so ​​that the stator teeth are located between two adjacent heat sinks (44). The winding (2) is in direct or indirect contact with the heat sink (44).

2. The heat dissipation device of a hub motor according to claim 1, characterized in that The stator bracket (4) comprises a bracket inner ring (41), a heat dissipation ring (42), a bracket outer ring (43) and a plurality of connecting strips (45); the bracket inner ring (41) is sleeved and fixed on the core shaft (8); the bracket outer ring (43) and the bracket inner ring (41) are fixedly connected via the plurality of connecting strips (45); the heat dissipation ring (42) is sleeved on the connecting strips (45) and is located on the side of the bracket outer ring (43); a plurality of heat dissipation fins (44) are evenly distributed on the side of the bracket outer ring (43) and are arranged around the heat dissipation ring (42); The cooling water channels on the stator support (4) are distributed on the support inner ring (41), the connecting strip (45), the heat dissipation ring (42) and the support outer ring (43); the water channels in the support outer ring (43) are connected to the water channels in the heat dissipation fin (44); the water channels in the support outer ring (43) and the water channels in the heat dissipation ring (42) are both connected to the water channels in the connecting strip (45); the water channels in the connecting strip (45) are connected to the water channels in the support inner ring (41); the water channels in the support inner ring (41) are connected to the water channels in the core shaft (8); the water channels in the core shaft (8) are connected to the core shaft water inlet (81) and the core shaft water outlet (82); the water channels in the support outer ring (43) and the water channels in the heat dissipation ring (42) are separated from each other; After the coolant is introduced from the core shaft water inlet (81), it flows through the core shaft (8), the bracket inner ring (41), the connecting strip (45), the heat dissipation ring (42), and finally is discharged through the core shaft water outlet (82), forming a complete cooling water channel; after the coolant is introduced from the core shaft water inlet (81), it flows through the core shaft (8), the bracket inner ring (41), the connecting strip (45), the bracket outer ring (43), the heat dissipation fin (44), and finally is discharged through the core shaft water outlet (82), forming a second complete cooling water channel, and the two cooling water channels are cooled simultaneously.

3. The heat dissipation device of a hub motor according to claim 2, characterized in that The cooling water channel comprises a plurality of bracket water inlet holes (431), a plurality of bracket water outlet holes (432), a first bracket water channel (433) and a plurality of second bracket water channels (434) located in the bracket outer ring (43); the bracket water inlet holes (431) and the bracket water outlet holes (432) are all connected to the water channel in the connecting strip (45); the first bracket water channel (433) is connected to all the bracket water outlet holes (432); the plurality of second bracket water channels (434) are separated from each other and each second bracket water channel (434) is connected to the bracket water inlet hole (431); a U-shaped connecting water channel (441) is formed in the heat sink (44); the two ends of the connecting water channel (441) are respectively connected to the first bracket water channel (433) and the second bracket water channel (434).

4. The heat dissipation device of a hub motor according to claim 3, characterized in that The interiors of the two ends of the core shaft (8) are hollow, and the cooling water channel includes 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 located in the middle section of the core shaft (8), the water inlet channel (83) is connected to the core shaft water inlet (81), the water outlet channel (84) is connected to the core shaft water outlet (82), the water inlet hole group is connected to the water inlet channel (83), the water outlet hole group is connected to the water outlet channel (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).

5. The heat dissipation device of a hub motor according to claim 4, characterized in that The cooling water channel further comprises a plurality of first bracket water inlet channels (47), a plurality of second bracket water inlet channels (48), a plurality of first bracket water outlet channels (49) and a plurality of second bracket water outlet channels (410) penetrating the bracket inner ring (41) and the connecting strip (45); the first bracket water inlet channel (47) is correspondingly connected to the first water inlet through-hole (85); the second bracket water inlet channel (48) is connected to the second water inlet through-hole (86) and the bracket water inlet hole (431); the first bracket water outlet channel (49) is connected to the first water outlet through-hole (87); the second bracket water outlet channel (410) is connected to the second water outlet through-hole (88) and the bracket water outlet hole (432).

6. The heat dissipation device of a hub motor according to claim 5, 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) located in the heat dissipation ring (42), wherein the heat dissipation water inlet holes (421) are connected to the first bracket water inlet channel (47), and the heat dissipation water outlet holes (422) are connected to the first bracket water outlet channel (49), and the two groups of heat dissipation water channels (423) are arranged in parallel and separated, and both groups of heat dissipation water channels (423) are connected to different heat dissipation water inlet holes (421) and different heat dissipation water outlet holes (422).

7. The heat dissipation device of a hub motor according to claim 6, characterized in that A plurality of guide plates (46) are further provided inside the heat dissipation ring (42), and the guide plates (46) are located inside the heat dissipation water inlet hole (421) and the heat dissipation water outlet hole (422). The coolant introduced into the heat dissipation water inlet hole (421) is diverted by the guide plates (46) and then moves to the heat dissipation water channels (423) located on both sides of the guide plates (46).

8. The heat dissipation device of a hub motor according to claim 6, characterized in that The water inlet channel (83) and the water outlet channel (84) are each provided with three groups, and the water inlet hole groups are provided with three groups in total, each of which includes two of the first water inlet through holes (85) and one of the second water inlet through holes (86); the water outlet hole groups are also provided with three groups, each of which includes two of the first water outlet through holes (87) and one of the second water outlet through holes (88), and the three water inlet hole groups and the three water outlet hole groups are alternately distributed.

9. The heat dissipation device of a hub motor according to claim 1, characterized in that It also includes a water-cooling radiator, wherein the water outlet of the water-cooling radiator is connected to the core shaft water inlet (81), and the water inlet of the water-cooling radiator is connected to the core shaft water outlet (82).

10. The heat dissipation device of a hub motor according to claim 2, characterized in that The heat dissipation ring (42) and the connecting strip (45), and the heat dissipation fin (44) and the bracket outer ring (43) are fixed by welding.

11. The heat dissipation device of a hub motor according to claim 1, characterized in that When the winding (2) is in indirect contact with the heat sink (44), a heat conduction medium is provided between the winding (2) and the heat sink (44).

12. The heat dissipation device of a hub motor according to claim 1, characterized in that The cooling water channel connection between the stator bracket (4) and the core shaft (8), and the cooling water channel connection between the stator bracket (4) and the heat sink (44) are both sealed by sealant.

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

14. The heat dissipation device of a hub motor according to claim 1, characterized in that It also includes a rotor (1) and end covers (5) located on both sides of the rotor (1), wherein the rotor (1) is sleeved on the stator core (3), a plurality of permanent magnets are adhered to the inner circumference of the rotor (1), and the two end covers (5) are fixed to the two side surfaces of the rotor (1) by a plurality of screws (6).

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