Heat dissipation device of motor and motor

Abstract

The heat dissipation device comprises a heat dissipation seat, a pump and an inner core shaft arranged in a rotor of the motor, a cavity and an oil collection tank are arranged in the heat dissipation seat, the cavity is communicated with the oil collection tank, the rotor is rotatably arranged on the cavity, a stator of the motor is arranged in the cavity, and the pump is arranged in the cavity. The inner core shaft is provided with a hollow part, the hollow part and the cavity are communicated with the oil collecting tank through the pump, and cooling oil in the oil collecting tank flows through the hollow part, a gap between the rotor and the stator and the cavity and finally flows into the oil collecting tank. According to the utility model, accurate heat dissipation of the stator and the rotor of the motor can be realized, heat dissipation efficiency is high, and continuous working time and service life of the motor are effectively prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, and in particular to a heat dissipation device for a motor and the motor. Background Art

[0002] When the motor is working, its stator and rotor will generate a lot of heat. The motor needs to work for a long time. The existing coil cannot withstand temperatures exceeding 200°C or higher, and the high-speed magnet is severely demagnetized due to the high temperature, which greatly reduces the performance and service life of the motor. Therefore, the heat dissipation method of the motor is very important. A suitable heat dissipation system can ensure the long-term stable operation of the motor. Selecting a suitable heat dissipation method according to actual conditions and performing regular maintenance can effectively extend the service life of the motor. The existing motor heat dissipation methods mainly include air cooling, liquid cooling and air cooling. However, these current heat dissipation methods cannot accurately dissipate heat for the stator and rotor, and the heat dissipation efficiency is low, resulting in the motor being unable to work continuously for a long time and having a short service life. Utility Model Content

[0003] In order to solve at least one of the problems mentioned in the above background technology, the present invention provides a heat dissipation device for a motor and a motor, which can achieve precise heat dissipation of the motor stator and rotor, have high heat dissipation efficiency, and effectively extend the continuous working time and service life of the motor.

[0004] The specific technical solutions provided by this utility model are as follows:

[0005] In a first aspect, a heat dissipation device for a motor is provided, comprising a heat sink, a pump, and an inner core shaft arranged in the rotor of the motor, wherein a cavity and an oil collecting tank are provided in the heat sink, the cavity is communicated with the oil collecting tank, the rotor is rotatably arranged on the cavity, the stator of the motor is arranged in the cavity, the inner core shaft is provided with a hollow portion, the hollow portion and the cavity are communicated with the oil collecting tank through the pump, and the cooling oil in the oil collecting tank flows through the hollow portion, the gap between the rotor and the stator, and the cavity, and finally flows into the oil collecting tank.

[0006] With the help of the above technical solution, the utility model sets a heat sink, a pump and an inner core shaft. The cooling oil in the oil collecting tank can enter the hollow part and the cavity of the inner core shaft through the action of the pump. The cooling oil flows through the hollow part of the inner core shaft to dissipate heat to the rotor. The cooling oil flows through the gap between the rotor and the stator to dissipate heat to the rotor and the stator. The cooling oil flows into the cavity to dissipate heat to the rotor and the stator. In this way, the heat dissipation of the rotor and stator of the motor is accurately achieved, the heat dissipation efficiency is high, and the continuous working time and service life of the motor are effectively extended.

[0007] As a preferred embodiment of the above scheme, the rotor includes a rotor hollow shaft, a rotor magnet and a rotor silicon steel sheet, the stator includes a stator coil, the inner core shaft is arranged in the rotor hollow shaft, and the cooling oil flows through the inner wall of the rotor hollow shaft, the gap between the rotor hollow shaft and the rotor silicon steel sheet, the gap between the rotor magnet and the stator coil, and the inside of the stator coil. According to the above scheme, the cooling oil flows through the hollow part of the inner core shaft and the inner wall of the rotor hollow shaft to simultaneously achieve heat dissipation of the rotor hollow shaft, the cooling oil flows through the gap between the rotor hollow shaft and the rotor silicon steel sheet to achieve heat dissipation of the rotor hollow shaft and the rotor silicon steel sheet, the cooling oil flows through the gap between the rotor magnet and the stator coil to achieve heat dissipation of the rotor magnet and the stator coil, and the cooling oil flows through the inside of the stator coil to achieve heat dissipation of the inside of the stator coil, thereby fully achieving precise heat dissipation of the rotor and stator with high heat dissipation efficiency.

[0008] As a preferred embodiment of the above solution, the heat sink includes an oil inlet seat, wherein an inner cavity is defined within the oil inlet seat, wherein one end of the rotor hollow shaft and the inner core shaft are disposed within the inner cavity, wherein the inner cavity is connected to the cavity body, and wherein the oil inlet seat is provided with an oil inlet hole connected to the inner cavity, wherein the oil inlet hole is connected to the oil collecting tank via a pipeline, and wherein the pump is disposed on the pipeline. According to the above solution, by providing the oil inlet seat and the pipeline, cooling oil in the oil collecting tank can be effectively introduced into the hollow portion and cavity of the inner core shaft by the action of the pump, thereby ensuring heat dissipation of the rotor and stator.

[0009] As a preferred embodiment of the above scheme, the heat sink further includes a first end cover and a second end cover, the cavity is located between the first end cover and the second end cover, the first end cover is fixedly connected to the oil inlet seat, a first through hole is formed on the first end cover, and a second through hole is formed on the second end cover, the hollow rotor shaft is fixed to the first end cover and the second end cover through a first bearing and a second bearing respectively, the first bearing, the first through hole, the second bearing, and the second through hole are all connected to the cavity, and the cooling oil flows through the first bearing, the first through hole, the second bearing, and the second through hole. According to the above scheme, the arrangement of the first end cover and the second end cover ensures the sealing of the cavity and the circulation and heat dissipation of the cooling oil in the cavity. At the same time, the first end cover and the second end cover are used to support the first bearing and the second bearing respectively. The first bearing and the second bearing ensure the rotation of the rotor. The cooling oil flows through the first bearing and the second bearing, which can not only lubricate the first bearing and the second bearing, but also cool the first bearing and the second bearing, thereby increasing the service life of the first bearing and the second bearing while ensuring the stable operation of the motor rotor; the cooling oil flows through the first through hole and the second through hole, which facilitates the cooling oil to flow into the cavity, facilitates the cooling oil to dissipate heat to the stator coil and flow back to the oil collecting tank.

[0010] As a preferred embodiment of the above embodiment, a first gap is defined between the first end cover and the hollow rotor shaft, the first gap communicating with the inner cavity, and a second gap is defined between the second end cover and the hollow rotor shaft. The cooling oil flows through the first bearing through the first gap, and the cooling oil flows through the second bearing through the second gap. According to the above embodiment, the provision of the first and second gaps facilitates the flow of cooling oil within the inner cavity of the oil inlet seat into the first bearing and the second bearing, thereby achieving lubrication and cooling of the first and second bearings.

[0011] As a preferred embodiment of the above scheme, a shaft tube is fixed on the second end cover, and the shaft tube is arranged outside the rotor hollow shaft. A first gap is provided between the shaft tube and the rotor hollow shaft, and the first gap is connected to the second gap and the second through-hole. A third bearing is fixed in the shaft tube, and the rotor hollow shaft is arranged on the third bearing, and the third bearing is connected to the first gap. A first flow hole is provided on the rotor hollow shaft, and the first flow hole is connected to the third bearing. A second flow hole is provided at one end of the inner core shaft, and the first flow hole and the second flow hole are connected through the second gap. The second gap is arranged between the inner core shaft and the rotor hollow shaft. The cooling oil flows through the hollow portion, the second flow hole, the second gap, the first flow hole, the third bearing and the first gap in sequence, and the cooling oil flows from the first gap into the second gap and the second through-hole. According to the above scheme, the shaft tube is used to protect the hollow shaft of the rotor and to support the third bearing. The third bearing is used to ensure the rotation of the hollow shaft of the rotor. The cooling oil flows out from the hollow part of the inner core shaft through the second flow hole to the second gap, and then flows through the first flow hole, the third bearing and the first gap in sequence from the second gap. The last part of the cooling oil flows into the cavity from the first gap through the second bearing, and the other part of the cooling oil flows into the cavity from the first gap through the second through hole. The cooling oil in the cavity flows through the inside of the coil of the stator coil and finally flows back into the oil collecting tank. In the above process, the cooling oil flowing through the second gap and the first flow hole can dissipate heat for the hollow shaft of the rotor, the cooling oil flowing through the third bearing can lubricate and cool the third bearing, and the cooling oil flowing through the first gap can dissipate heat for the shaft tube, thereby further realizing the heat dissipation of the hollow shaft of the rotor.

[0012] As a preferred embodiment of the above solution, a third gap is provided between the inner core shaft and the hollow rotor shaft, and a third flow hole is formed in the hollow rotor shaft. The third flow hole communicates with the third gap and the gap between the hollow rotor shaft and the rotor silicon steel sheets. According to the above solution, cooling oil in the third gap further dissipates heat from the hollow rotor shaft. The cooling oil in the third gap flows through the gap between the hollow rotor shaft and the rotor silicon steel sheets through the third flow hole, thereby dissipating heat from the hollow rotor shaft and the rotor silicon steel sheets, further improving the heat dissipation efficiency of the rotor.

[0013] As a preferred embodiment of the above solution, the heat sink is formed with heat dissipation fins. According to the above solution, the heat dissipation fins are connected to the air, which can achieve large-area heat dissipation of the entire heat sink and rapid air cooling of the heat sink, further improving the heat dissipation efficiency of the motor.

[0014] As a preferred embodiment of the above solution, the oil collecting tank is located below the heat sink, and oil return holes are provided on both sides of the top of the oil collecting tank. The oil return holes are connected to the cavity, and the cooling oil in the cavity flows back to the oil collecting tank through the oil return holes. According to the above solution, the oil collecting tank is located below the heat sink, so that the cooling oil can circulate more easily and finally flow back to the oil collecting tank due to the principle of gravity.

[0015] In a second aspect, a motor is provided, comprising the heat dissipation device of the motor as described above, and further comprising a free turbine, wherein the free turbine is arranged on the central axis of the rotor and is located on one side of the shaft tube.

[0016] When the motor of the present invention is working, the turbojet engine ejects airflow, the airflow drives the free turbine to rotate, and the free turbine drives the hollow shaft of the rotor to rotate, so that the rotor rotates and cooperates with the stator to generate electricity. During the power generation process, the motor can achieve rapid heat dissipation and cooling through the heat dissipation device, thereby ensuring the performance of the motor and effectively extending the continuous working time and service life of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 This is a schematic structural diagram of the second embodiment of the present utility model;

[0019] Figure 2 for Figure 1 Schematic diagram of the local structure;

[0020] Figure 3 for Figure 1 Another partial structural schematic diagram;

[0021] Figure 4 It is a schematic diagram of the three-dimensional structure of the heat sink of the utility model. DETAILED DESCRIPTION

[0022] To make the purpose, technical solutions, and advantages of the present invention more clear, the following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0023] Example 1

[0024] like Figures 1 to 4 As shown (the direction of the arrow in the figure is the flow direction of the cooling oil), the present invention provides a heat dissipation device for a motor, comprising a heat dissipation seat 1, a pump 2 and an inner core shaft 3 arranged in the rotor 100 of the motor, the heat dissipation seat 1 is provided with a cavity 11 and an oil collecting tank 4, the cavity 11 is communicated with the oil collecting tank 4, the rotor 100 is rotatably set on the cavity 11, the stator 200 of the motor is set in the cavity 11, the inner core shaft 3 is provided with a hollow portion 31, the hollow portion 31 and the cavity 11 are communicated with the oil collecting tank 4 through the pump 2, the cooling oil in the oil collecting tank 4 flows through the hollow portion 31, the gap between the rotor 100 and the stator 200 and the cavity 11, and finally flows into the oil collecting tank 4.

[0025] The rotor 100 includes a rotor hollow shaft 101, a rotor magnet 102 and a rotor silicon steel sheet 103, the stator includes a stator coil 200 and a stator silicon steel sheet (not shown), the inner core shaft 3 is arranged in the rotor hollow shaft 101, and the cooling oil flows through the inner wall of the rotor hollow shaft 101, the gap between the rotor hollow shaft 101 and the rotor silicon steel sheet 103, the gap between the rotor magnet 102 and the stator coil 200, and the inside of the stator coil 200. The cooling oil flows through the hollow part 31 of the inner core shaft 3 and the inner wall of the rotor hollow shaft 101 to synchronously achieve heat dissipation of the rotor hollow shaft 101. The cooling oil flows through the gap between the rotor hollow shaft 101 and the rotor silicon steel sheet 103 to achieve heat dissipation of the rotor hollow shaft 101 and the rotor silicon steel sheet 103. The cooling oil flows through the gap between the rotor magnet 102 and the stator coil 200 to achieve heat dissipation of the rotor magnet 102 and the stator coil 200. The cooling oil flows through the inside of the stator coil 200 to achieve heat dissipation inside the stator coil 200, thereby fully achieving precise heat dissipation of the rotor 100 and the stator with high heat dissipation efficiency.

[0026] The heat sink 1 includes an oil inlet seat 5, which has an inner cavity 51. The rotor hollow shaft 101 and one end of the inner core shaft 3 are disposed within the inner cavity 51. The inner cavity 51 is connected to the cavity 11. The oil inlet seat 5 is provided with an oil inlet hole 52 connected to the inner cavity 51. The oil inlet hole 52 is connected to the oil collecting tank 4 via a pipeline 6. The pump 2 is disposed on the pipeline 6. By providing the oil inlet seat 5 and the pipeline 6, the cooling oil in the oil collecting tank 4 can be effectively introduced into the hollow portion 31 of the inner core shaft 3 and the cavity 11 via the action of the pump 2, thereby ensuring heat dissipation of the rotor 100 and the stator.

[0027] The heat sink 1 also includes a first end cover 12 and a second end cover 13. The cavity 11 is located between the first end cover 12 and the second end cover 13. The first end cover 12 is fixedly connected to the oil inlet seat 5. A first bearing 71 is fixed on the first end cover 12, and a first through hole 121 is formed on the first end cover 12. A second bearing 72 is fixed on the second end cover 13, and a second through hole 131 is formed on the second end cover 13. The hollow rotor shaft 101 is fixed to the first end cover 12 and the second end cover 13 through the first bearing 71 and the second bearing 72 respectively. The first bearing 71, the first through hole 121, the second bearing 72, and the second through hole 131 are all connected to the cavity 11, and the cooling oil flows through the first bearing 71, the first through hole 121, the second bearing 72, and the second through hole 131. The arrangement of the first end cover 12 and the second end cover 13 ensures the sealing of the cavity 11 and the circulation and heat dissipation of the cooling oil in the cavity 11. At the same time, the first end cover 12 and the second end cover 13 are respectively used to support the first bearing 71 and the second bearing 72. The first bearing 71 and the second bearing 72 ensure the rotation of the rotor 100. The cooling oil flows through the first bearing 71 and the second bearing 72, which can not only lubricate the first bearing 71 and the second bearing 72, but also cool the first bearing 71 and the second bearing 72, thereby increasing the service life of the first bearing 71 and the second bearing 72 while ensuring the stable operation of the motor rotor 100; the cooling oil flows through the first through hole 121 and the second through hole 131, which facilitates the cooling oil to flow into the cavity 11, and facilitates the cooling oil to dissipate heat to the stator coil 200 and flow back to the oil collecting tank 4. A first gap 81 is defined between the first end cover 12 and the hollow rotor shaft 101. The first gap 81 communicates with the inner cavity 11. A second gap 82 is defined between the second end cover 12 and the hollow rotor shaft 101. The cooling oil flows through the first bearing 71 through the first gap 81, and the cooling oil flows through the second bearing 72 through the second gap 82. The provision of the first gap 81 and the second gap 82 facilitates the flow of cooling oil within the inner cavity of the oil inlet seat into the first bearing 71 and the second bearing 72, thereby lubricating and cooling the first bearing 71 and the second bearing 72.

[0028] A shaft tube 90 is fixed on the second end cover 13, and the shaft tube 90 is arranged outside the rotor hollow shaft 101. A first gap 91 is provided between the shaft tube 90 and the rotor hollow shaft 101, and the first gap 91 is communicated with the second gap 82 and the second through hole 131. A third bearing 73 is fixed in the shaft tube 90, and the rotor hollow shaft 101 is arranged on the third bearing 73, and the third bearing 73 is communicated with the first gap 91. A first flow hole 104 is provided on the rotor hollow shaft 101. In this embodiment, the first flow hole 104 is provided with two groups, each group is provided with two first flow holes 104, and the two first flow holes 104 are respectively located on the upper and lower sides of the inner core shaft 3. The first circulation hole 104 is connected to the third bearing 73, and a second circulation hole 32 is provided at one end of the inner core shaft 3. In this embodiment, two second circulation holes 32 are provided, and the two second circulation holes 32 are respectively located on the upper and lower sides of the inner core shaft 3. The first circulation hole 104 and the second circulation hole 32 are connected through the second gap 92. The second gap 92 is arranged between the inner core shaft 3 and the rotor hollow shaft 101. The cooling oil flows through the hollow portion 31, the second circulation hole 32, the second gap 92, the first circulation hole 104, the third bearing 83 and the first gap 91 in sequence, and the cooling oil flows from the first gap 91 into the second gap 82 and the second through hole 131. The shaft tube 90 is provided to protect the hollow rotor shaft 101 and to support the third bearing 73. The third bearing 73 is used to ensure the rotation of the hollow rotor shaft 104. The cooling oil flows out from the hollow portion 31 of the inner core shaft 3 through the second flow hole 32 to the second gap 92, and then flows from the second gap 92 through the first flow hole 104, the third bearing 73 and the first gap 91 in sequence. Finally, part of the cooling oil flows from the first gap 91 through the second bearing 72 into the cavity 11, and the other part of the cooling oil flows from the first gap 91 to the cavity 11. The gap 91 flows into the cavity 11 through the second through-hole 131. The cooling oil in the cavity 11 flows through the coils of the stator coil 200 and finally flows back into the oil collecting tank 4. During the above process, the cooling oil flowing through the second gap 92 and the first flow hole 104 can dissipate heat for the rotor hollow shaft 101. The cooling oil flowing through the third bearing 73 can lubricate and cool the third bearing 73. The cooling oil flowing through the first gap 91 can dissipate heat for the shaft tube 90, thereby further dissipating heat for the rotor hollow shaft 101. A third gap 93 is provided between the inner core shaft 3 and the rotor hollow shaft 101. A third flow hole 105 is formed on the rotor hollow shaft 101. In this embodiment, there are two third flow holes 105, which are respectively located on the upper and lower sides of the inner core shaft 3. The third flow holes 105 are connected to the third gap 93 and the gap between the rotor hollow shaft 101 and the rotor silicon steel sheet 103.The cooling oil in the third gap 93 further dissipates heat from the hollow rotor shaft 101. The cooling oil in the third gap 93 flows through the gap between the hollow rotor shaft 101 and the rotor silicon steel sheets 103 via the third flow holes 105, thereby dissipating heat from the hollow rotor shaft 101 and the rotor silicon steel sheets 103, further improving the heat dissipation efficiency of the rotor 100. In this embodiment, a support member 300 is provided within the third gap 93 to support the inner core shaft 3. A third gap 83 is provided between the oil inlet seat 5 and the hollow rotor shaft 101. The inner cavity 51 of the oil inlet seat 5 communicates with the cavity 11 through the third gap 83.

[0029] The heat sink 1 is formed with heat dissipation fins 14 on the outside. The heat dissipation fins 14 are connected to the air, which can achieve large-area heat dissipation of the entire heat sink 1, while achieving rapid air cooling and heat dissipation of the heat sink 1, further improving the heat dissipation efficiency of the motor. The oil collecting tank 4 is located at the lower part of the heat sink 1. Oil return holes 41 are provided on both sides of the top of the oil collecting tank 4. The oil return holes 41 are connected to the cavity 11, and the cooling oil in the cavity 11 flows back to the oil collecting tank 4 through the oil return holes 41. The oil collecting tank 4 is arranged at the lower part of the heat sink 1, so that the cooling oil can circulate more easily and finally flow back to the oil collecting tank 4 through the principle of gravity.

[0030] In this embodiment, the cooling oil in the oil collecting tank 4 flows into the oil inlet hole 52 of the oil inlet seat 5 through the pipeline 6 under the action of the pump 2 and then enters the inner cavity 51. Then, part of the cooling oil enters the hollow part 31 of the inner core shaft 3, part of it enters the rotor hollow shaft 101 to dissipate heat for the rotor hollow shaft 101, and the other part flows through the first gap 81 and the first bearing 71 and the first through hole 121 through the third gap 83 to lubricate and cool the first bearing 71, and then the cooling oil flows into the cavity 11; the cooling oil in the hollow part 31 of the inner core shaft 3 flows through the entire inner core shaft 3 and finally flows out from the second flow hole 32 to the second gap 92, and then flows from the second gap 92 through the first flow hole 104, the third bearing 73 and the first gap 91, thereby dissipating heat for the rotor hollow shaft 101 and the shaft tube 90, lubricating and cooling the third bearing 73, and the first gap 91 Part of the cooling oil flows through the second gap 82 and the second bearing 72 into the cavity 11, and the other part flows into the cavity 11 through the second through hole 131, thereby lubricating and cooling the second bearing 72; the cooling oil in the rotor hollow shaft 101 flows through the gap between the rotor hollow shaft 101 and the rotor silicon steel sheet 103 through the third flow hole 105, thereby achieving heat dissipation of the rotor hollow shaft 101 and the rotor silicon steel sheet 103, and finally flows into the cavity 11; the cooling oil in the cavity 11 flows through the gap between the rotor magnet 102 and the stator coil 200, as well as the inside of the coil of the stator coil 200, to dissipate heat to the rotor magnet 102 and the stator coil 200, and finally the cooling oil flows from the cavity 11 through the oil return hole 41 and finally returns to the oil collecting tank 4 for cooling and recycling, thereby utilizing the circulating flow of the cooling oil to achieve rapid heat dissipation of the rotor 100 and the stator.

[0031] The utility model provides a heat sink 1, a pump 2 and an inner core shaft 3, so that the cooling oil in the oil collecting tank 4 can enter the hollow part 31 of the inner core shaft 3 and the cavity 11 through the action of the pump 2, and the cooling oil flows through the hollow part 31 of the inner core shaft 3 to dissipate heat to the rotor 100, and the cooling oil flows through the gap between the rotor 100 and the stator to dissipate heat to the rotor 100 and the stator, and the cooling oil flows into the cavity 11 to dissipate heat to the rotor 100 and the stator. In this way, the heat dissipation of the rotor 100 and the stator of the motor is accurately achieved, the heat dissipation efficiency is high, and the continuous working time and service life of the motor are effectively extended.

[0032] Example 2

[0033] like Figure 2 As shown, the present invention provides a motor, including the heat dissipation device of the motor described in Example 1, and also including a free turbine 400. The free turbine 400 is arranged on the rotor central axis 101 and is located on one side of the shaft tube 90.

[0034] When the motor of the present invention is working, the turbojet engine ejects airflow, the airflow drives the free turbine to rotate, and the free turbine drives the hollow shaft of the rotor to rotate, so that the rotor rotates and cooperates with the stator to generate electricity. During the power generation process, the motor can achieve rapid heat dissipation and cooling through the heat dissipation device, thereby ensuring the performance of the motor and effectively extending the continuous working time and service life of the motor.

[0035] Although preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they become aware of the basic creative concepts. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0036] Obviously, those skilled in the art may make various modifications and variations to the present invention without departing from the spirit and scope of the present invention. Thus, if such modifications and variations fall within the scope of the claims of the present invention and their equivalents, the present invention is intended to include such modifications and variations.

Claims

1. A heat dissipation device for a motor, characterized in that: It includes a heat sink, a pump and an inner core shaft arranged in the rotor of the motor, the heat sink is provided with a cavity and an oil collecting tank, the cavity is connected with the oil collecting tank, the rotor is rotatably arranged on the cavity, the stator of the motor is arranged in the cavity, the inner core shaft is provided with a hollow portion, the hollow portion and the cavity are connected with the oil collecting tank through the pump, and the cooling oil in the oil collecting tank flows through the hollow portion, the gap between the rotor and the stator, and the cavity, and finally flows into the oil collecting tank.

2. The heat dissipation device of the motor according to claim 1, characterized in that: The rotor includes a rotor hollow shaft, a rotor magnet and a rotor silicon steel sheet, the stator includes a stator coil, the inner core shaft is arranged in the rotor hollow shaft, and the cooling oil flows through the inner wall of the rotor hollow shaft, the gap between the rotor hollow shaft and the rotor silicon steel sheet, the gap between the rotor magnet and the stator coil, and the inside of the stator coil.

3. The heat dissipation device of the motor according to claim 2, characterized in that: The heat sink seat includes an oil inlet seat, an inner cavity is provided in the oil inlet seat, one end of the rotor hollow shaft and the inner core shaft is arranged in the inner cavity, the inner cavity is connected with the cavity body, and an oil inlet hole connected with the inner cavity is provided on the oil inlet seat, the oil inlet hole is connected with the oil collecting tank through a pipeline, and the pump is arranged on the pipeline.

4. The heat dissipation device for a motor according to claim 3, characterized in that: The heat sink further includes a first end cover and a second end cover, the cavity is located between the first end cover and the second end cover, the first end cover is fixedly connected to the oil inlet seat, a first through hole is formed on the first end cover, and a second through hole is formed on the second end cover, the hollow rotor shaft is fixed to the first end cover and the second end cover through a first bearing and a second bearing respectively, the first bearing, the first through hole, the second bearing, and the second through hole are all connected to the cavity, and the cooling oil flows through the first bearing, the first through hole, the second bearing, and the second through hole.

5. The heat dissipation device for a motor according to claim 4, characterized in that: A first gap is provided between the first end cover and the rotor hollow shaft, the first gap is communicated with the inner cavity, a second gap is provided between the second end cover and the rotor hollow shaft, the cooling oil flows through the first bearing through the first gap, and the cooling oil flows through the second bearing through the second gap.

6. The heat dissipation device for a motor according to claim 5, characterized in that: A shaft tube is fixed on the second end cover, and the shaft tube is arranged outside the rotor hollow shaft. A first gap is provided between the shaft tube and the rotor hollow shaft, and the first gap is connected with the second gap and the second through hole. A third bearing is fixed in the shaft tube, and the rotor hollow shaft is arranged on the third bearing, and the third bearing is connected with the first gap. A first flow hole is provided on the rotor hollow shaft, and the first flow hole is connected with the third bearing. A second flow hole is provided at one end of the inner core shaft, and the first flow hole and the second flow hole are connected through the second gap. The second gap is provided between the inner core shaft and the rotor hollow shaft. The cooling oil flows through the hollow portion, the second flow hole, the second gap, the first flow hole, the third bearing and the first gap in sequence, and the cooling oil flows from the first gap into the second gap and the second through hole.

7. The heat dissipation device for a motor according to claim 2, characterized in that: A third gap is provided between the inner core shaft and the rotor hollow shaft, a third flow hole is formed on the rotor hollow shaft, and the third flow hole is communicated with the third gap and the gap between the rotor hollow shaft and the rotor silicon steel sheet.

8. The heat dissipation device for a motor according to claim 1, characterized in that: The heat sink is formed with heat sink fins on the outside.

9. The heat dissipation device for a motor according to claim 1, characterized in that: The oil collecting tank is located at the lower part of the heat sink, and oil return holes are arranged on both sides of the top of the oil collecting tank. The oil return holes are connected to the cavity, and the cooling oil in the cavity flows back to the oil collecting tank through the oil return holes.

10. A motor, characterized in that: A heat dissipation device for a motor comprising the heat dissipation device as described in any one of claims 1 to 9.

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