A motor cooling system

Abstract

The application belongs to the technical field of motor cooling, and discloses a motor cooling system, which comprises an air cooling unit and a water cooling unit. The air cooling unit comprises an air inlet part and an air outlet part. The air inlet part can deliver cooling air into the gap between the rotor and the stator. The cooling air delivered into the gap between the rotor and the stator can flow out of the air outlet part. The water cooling unit comprises a water channel arranged on the stator. Cooling water can flow along the water channel. In the application, the air cooling unit can cool the rotor of the motor, and the water cooling unit can cool the stator, so that the motor does not fail due to high temperature. That is, the motor can be cooled by the motor cooling system, thereby prolonging the service life of the motor.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of motor cooling, in particular to a motor cooling system. BACKGROUND

[0002] With the development of the automobile industry, the performance of the vehicle driving motor is gradually improved, that is, the power and torque and other indicators of the motor are gradually improved, but large power and large torque will cause the motor to generate a large amount of heat, thereby shortening the service life of the motor.

[0003] Therefore, the above problems need to be solved. SUMMARY

[0004] The purpose of the present application is to provide a motor cooling system to solve the problem that large power and large torque will cause the motor to generate a large amount of heat, thereby shortening the service life of the motor.

[0005] To achieve this purpose, the present application adopts the following technical solutions:

[0006] A motor cooling system, the motor comprising a stator and a rotor, the stator being sleeved on the outer periphery of the rotor, the motor cooling system comprising:

[0007] an air cooling unit comprising an air inlet portion and an air outlet portion, the air inlet portion being capable of conveying cooling air into a gap between the rotor and the stator, the cooling air conveyed into the gap between the rotor and the stator being capable of flowing out of the air outlet portion; and

[0008] a water cooling unit comprising a water channel wound on the stator, cooling water being capable of flowing along the water channel.

[0009] As a preferred, the motor further comprises a front end cover, a rear end cover and a shell, the front end cover, the stator and the rear end cover are all sleeved on the outer periphery of the rotor and are arranged at intervals along the axial direction of the rotor, the shell is sleeved on the outer periphery of the stator and abuts between the front end cover and the rear end cover, the air inlet portion and the air outlet portion are both sleeved on the outer periphery of the shell and are respectively provided with an air inlet and an air outlet, the gap between the front end cover and the stator is communicated with the air inlet, and the gap between the rear end cover and the stator is communicated with the air outlet.

[0010] As a preferred, the air inlet portion and the air outlet portion are both hollow, the shell is provided with a first ventilation hole and a second ventilation hole, the gap between the front end cover and the stator is communicated with the inside of the air inlet portion through the first ventilation hole, and the gap between the rear end cover and the stator is communicated with the inside of the air outlet portion through the second ventilation hole.

[0011] As preferred, at least two first ventilation holes and at least two second ventilation holes are arranged on the shell, the at least two first ventilation holes are uniformly arranged along the circumference of the rotor, and the at least two second ventilation holes are uniformly arranged along the circumference of the rotor.

[0012] As preferred, the air cooling unit further comprises a fan and an air-water cooler, the air-water cooler is connected between the air outlet and the fan, and is configured to cool the cooling air flowing out of the air outlet, and the fan is connected between the air-water cooler and the air inlet.

[0013] As preferred, the front end cover and the rear end cover are sleeved on the outer periphery of the rotor through bearings, and the motor cooling system further comprises an auxiliary heat dissipation unit, the auxiliary heat dissipation unit is arranged on the front end cover and the rear end cover, and is configured to cool the bearings.

[0014] As preferred, the auxiliary heat dissipation unit comprises a heat dissipation plate and a mounting plate, the heat dissipation plate is arranged on the side of the front end cover facing the stator and the side of the rear end cover facing the stator, and the heat dissipation plate is sleeved on the outer periphery of the bearing through the mounting plate.

[0015] As preferred, the auxiliary heat dissipation unit comprises a plurality of heat dissipation plates, and the plurality of heat dissipation plates are uniformly arranged on the side of the mounting plate away from the bearing around the axis of the rotor.

[0016] As preferred, the motor cooling system further comprises a control unit, and the control unit is configured to control the air cooling unit and / or the water cooling unit to start or stop cooling.

[0017] As preferred, the control unit comprises a controller, a first temperature sensor and a second temperature sensor, the first temperature sensor and the second temperature sensor are in communication connection with the controller, and the first temperature sensor and the second temperature sensor are arranged on the rotor and the stator respectively and can detect the temperature of the rotor and the stator respectively.

[0018] As preferred, the control unit further comprises a signal transmitter, the signal transmitter is connected to the rotor and connected to the first temperature sensor through a first lead wire.

[0019] As preferred, the second temperature sensor is connected to the controller through a second lead wire.

[0020] Preferably, the front end cover and the rear end cover are provided with temperature measuring holes in communication with the inner holes thereof, and a third temperature sensor is arranged in each of the temperature measuring holes of the front end cover and the rear end cover, and the third temperature sensor is in communication connection with the controller, and the third temperature sensor can detect the temperature of the bearing.

[0021] Preferably, the motor further comprises an inner shell sleeved on the outer periphery of the stator and abutting between the outer shell and the stator, and the inner shell is provided with a groove on the side facing the outer shell, and the groove extends spirally around the axis of the rotor.

[0022] Preferably, the outer shell is provided with a first water passage and a second water passage, and the first water passage and the second water passage are in communication with the two ends of the groove, respectively.

[0023] The motor cooling system of the present application can cool the rotor of the motor through the air cooling unit and cool the stator through the water cooling unit, so that the service life of the motor is prolonged. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is a structural schematic view of the motor and the motor cooling system in the embodiment of the present application;

[0025] Figure 2 is a structural schematic view of the motor cooling system and the motor in the embodiment of the present application except the fan, the air-water cooler, the first temperature sensor, the second temperature sensor and the first lead wire;

[0026] Figure 3 is a sectional view along the line A-A in Figure 2 ;

[0027] Figure 4 is a structural schematic view of the motor cooling system and the motor in the embodiment of the present application except the fan and the air-water cooler;

[0028] Figure 5 is a sectional view along the line B-B in Figure 4 ;

[0029] Figure 6 is an exploded view of the motor cooling system and the motor in the embodiment of the present application except the fan, the air-water cooler and the control unit;

[0030] Figure 7 is a structural schematic view of the auxiliary heat dissipation unit in the embodiment of the present application.

[0031] In the drawings:

[0032] 110, stator; 120, rotor; 130, front end cover; 131, temperature measuring hole; 140, rear end cover; 150, outer shell; 160, bearing; 170, inner shell;

[0033] 211, air inlet part; 2111, air inlet; 212, air outlet part; 2121, air outlet; 213, first air vent; 214, second air vent; 215, fan; 216, air-water cooler;

[0034] 221, water channel; 222, groove; 223, first water inlet; 224, second water inlet;

[0035] 230, auxiliary heat dissipation unit; 231, heat dissipation plate; 232, mounting plate;

[0036] 241, first temperature sensor; 242, second temperature sensor; 243, signal transmitter; 244, first lead wire; 245, third temperature sensor. DETAILED DESCRIPTION

[0037] The application will be further described below in conjunction with the drawings and embodiments. It should be understood that the specific embodiments described herein are intended to serve only for the purpose of explanation and are not intended to limit the application. It should also be noted that, for the purpose of description, only the parts related to the application are shown in the drawings, rather than all the parts.

[0038] In the description of the application, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0039] In the present application, unless otherwise explicitly specified and limited, the "upper" or "lower" of the first feature to the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the "upper", "above" and "on" of the first feature to the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The "below", "under" and "under" of the first feature to the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0040] In the description of the present embodiment, the terms "upper", "lower", "right", "left", and the like, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used to distinguish in the description, and have no special meaning.

[0041] As shown in Figures 1 to 6 , the motor includes a stator 110 and a rotor 120, the stator 110 is sleeved on the outer periphery of the rotor 120, in addition to the stator 110 and the rotor 120, the motor also includes a front end cover 130, a rear end cover 140 and an outer shell 150, the front end cover 130, the stator 110 and the rear end cover 140 are all sleeved on the outer periphery of the rotor 120 and are arranged in the axial direction of the rotor 120, and the outer shell 150 is sleeved on the outer periphery of the stator 110 and abuts between the front end cover 130 and the rear end cover 140.

[0042] To solve the problems mentioned above, the present embodiment provides a motor cooling system, please refer to Figures 1 to 7 , the motor cooling system includes an air cooling unit and a water cooling unit, the air cooling unit includes an air inlet part 211 and an air outlet part 212, the air inlet part 211 can deliver cooling air to the gap between the rotor 120 and the stator 110, the cooling air sent into the gap between the rotor 120 and the stator 110 can flow out of the air outlet part 212, and the water cooling unit includes a water channel 221 arranged on the stator 110, cooling water can flow along the water channel 221.

[0043] In the present embodiment, the air cooling unit can cool the rotor 120 of the motor, and the water cooling unit can cool the stator 110, so as to avoid the failure of the motor due to high temperature, that is, the present embodiment can cool the motor through the motor cooling system, thereby prolonging the service life of the motor.

[0044] Specifically, the air inlet part 211 of the air cooling unit can send air into the gap between the rotor 120 and the stator 110, the heat on the rotor 120 can be transferred to the cooling air sent into the gap between the rotor 120 and the stator 110, and the cooling air sent into the gap between the rotor 120 and the stator 110 can leave the motor interior through the air outlet part 212, that is, in this embodiment, an air passage for circulating cooling air can be formed between the air inlet part 211, the gap between the rotor 120 and the stator 110, and the air outlet part 212, so as to cool and heat dissipate the rotor 120, and the stator 110 is wound with a water passage 221 for circulating cooling water, and the heat on the stator 110 can be transferred to the cooling water circulating along the water passage 221, so as to cool and heat dissipate the stator 110. This embodiment can timely cool and heat dissipate the rotor 120 and the stator 110 of the motor through the air cooling unit and the water cooling unit, so as to avoid the motor from being disabled due to excessively high temperature, thereby prolonging the service life of the motor.

[0045] Based on the foregoing, the front end cover 130, the stator 110, and the rear end cover 140 are all sleeved on the outer periphery of the rotor 120 and are arranged at intervals along the axial direction of the rotor 120, that is, there is a gap between the front end cover 130 and the stator 110, and there is also a gap between the rear end cover 140 and the stator 110. Preferably, the air inlet part 211 and the air outlet part 212 in this embodiment are both sleeved on the outer periphery of the housing 150 and are respectively provided with an air inlet 2111 and an air outlet 2121. The gap between the front end cover 130 and the stator 110 is communicated with the air inlet 2111, the cooling air can enter the gap between the front end cover 130 and the stator 110 through the air inlet 2111, and then enter the gap between the rotor 120 and the stator 110, so as to cool and heat dissipate the rotor 120. The gap between the rear end cover 140 and the stator 110 is communicated with the air outlet 2121, the cooling air can circulate from the gap between the rotor 120 and the stator 110 to the gap between the rear end cover 140 and the stator 110, and can leave the gap between the rear end cover 140 and the stator 110 through the air outlet 2121, so as to flow out of the motor interior.

[0046] Preferably, the air cooling unit in the embodiment further comprises a fan 215 and an air-water cooler 216, the air-water cooler 216 is communicated between the air outlet 2121 and the fan 215 and is configured to cool the cooling air flowing out of the air outlet 2121, the fan 215 is communicated between the air-water cooler 216 and the air inlet 2111, the air inlet 2111 of the air inlet part 211 and the air outlet 2121 of the air outlet part 212 in the embodiment are communicated through the fan 215 and the air-water cooler 216, the fan 215, the motor interior and the air-water cooler 216 jointly form an air path, the cooling air for cooling and heat dissipation of the rotor 120 is formed by the air in the motor and the motor cooling system, that is, the embodiment makes the air in the motor and the motor cooling system circulate along the air path jointly formed by the fan 215, the motor interior and the air-water cooler 216 to cool and heat dissipate the rotor 120, without needing to suck air from the outside, so as to avoid that the impurities such as dust and particles in the outside air enter the motor interior, thereby avoiding that the impurities such as dust and particles in the outside air affect the service life of the motor. It can be understood that when the cooling air enters the gap between the rotor 120 and the stator 110, the heat on the rotor 120 can be transferred to the cooling air, that is, the cooling air can absorb the heat of the rotor 120, the temperature of the cooling air after absorbing the heat will be increased, that is, the temperature of the cooling air flowing out of the air outlet 2121 is high, in order to ensure that the cooling air re-entering the motor interior from the air inlet 2111 can effectively cool and heat dissipate the rotor 120, the air-water cooler 216 is arranged between the fan 215 and the air outlet 2121 in the embodiment, the air-water cooler 216 cools the cooling air flowing out of the air outlet 2121.

[0047] It can be understood that since the structure and working principle of the fan 215 and the air-water cooler 216 are prior art, the embodiment does not make a detailed description.

[0048] Further, the air inlet portion 211 and the air outlet portion 212 in the embodiment are both hollow, the air inlet portion 211 is abutted between the housing 150 and the front end cover 130 along the axial direction of the rotor 120 and close to the end wall of the front end cover 130, the air outlet portion 212 is abutted between the housing 150 and the rear end cover 140 along the axial direction of the rotor 120 and close to the end wall of the rear end cover 140, the housing 150 is provided with a first air vent hole 213 and a second air vent hole 214, the air inlet portion 211 is covered outside the first air vent hole 213, and the air outlet portion 212 is covered outside the second air vent hole 214, that is, the air cooling unit in the embodiment further includes the first air vent hole 213 and the second air vent hole 214 provided on the housing 150, the gap between the front end cover 130 and the stator 110 is communicated with the inside of the air inlet portion 211 through the first air vent hole 213, and the gap between the rear end cover 140 and the stator 110 is communicated with the inside of the air outlet portion 212 through the second air vent hole 214, so as to form an air passage for circulating cooling air between the gap between the air inlet portion 211, the rotor 120 and the stator 110 and the air outlet portion 212.

[0049] In the embodiment, the housing 150 is provided with at least two first air vent holes 213 and at least two second air vent holes 214, the at least two first air vent holes 213 are uniformly arranged along the circumferential direction of the rotor 120, so that the cooling air can enter the gap between the front end cover 130 and the stator 110 from the inside of the air inlet portion 211 along the circumferential direction of the rotor 120, and then enter the gap between the rotor 120 and the stator 110 from the gap between the front end cover 130 and the stator 110 along the circumferential direction of the rotor 120, that is, the embodiment can ensure that the cooling air can flow through the gap between the rotor 120 and the stator 110 at each position along the circumferential direction of the rotor 120, so as to improve the cooling efficiency of the rotor 120, and the at least two second air vent holes 214 are uniformly arranged along the circumferential direction of the rotor 120, so as to ensure that the cooling air circulating to the gap between the rear end cover 140 and the stator 110 can flow out through each second air vent hole 214.

[0050] Further, the front end cover 130 and the rear end cover 140 are both sleeved on the outer periphery of the rotor 120 through the bearing 160, the heat of the rotor 120 can be transferred to the bearing 160, and the high temperature of the bearing 160 can also cause the motor to fail, therefore, the motor cooling system in the embodiment further includes an auxiliary heat dissipation unit 230, the auxiliary heat dissipation unit 230 is arranged on the front end cover 130 and the rear end cover 140, and the auxiliary heat dissipation unit 230 is configured to cool the bearing 160, so as to further prolong the service life of the motor.

[0051] Preferably, the auxiliary heat dissipation unit 230 comprises a heat dissipation plate 231 and a mounting plate 232, the heat dissipation plate 231 is arranged on the side of the front end cover 130 facing the stator 110 and the side of the rear end cover 140 facing the stator 110, the heat dissipation plate 231 is sleeved on the outer periphery of the bearing 160 through the mounting plate 232, that is, the mounting plate 232 is sleeved on the outer periphery of the bearing 160, and the heat dissipation plate 231 is located on the side of the mounting plate 232 away from the bearing 160. The heat transferred to the bearing 160 by the rotor 120 can be transferred to the heat dissipation plate 231 through the mounting plate 232. Since the heat dissipation plate 231 arranged on the front end cover 130 is located in the gap between the front end cover 130 and the stator 110, the heat transferred to the heat dissipation plate 231 arranged on the front end cover 130 can be transferred to the cooling air in the gap between the front end cover 130 and the stator 110. Correspondingly, since the heat dissipation plate 231 arranged on the rear end cover 140 is located in the gap between the rear end cover 140 and the stator 110, the heat transferred to the heat dissipation plate 231 arranged on the rear end cover 140 can be transferred to the cooling air in the gap between the rear end cover 140 and the stator 110, thereby cooling and dissipating heat for the bearing 160.

[0052] It can be understood that in the embodiment, the rotor 120 can be further cooled and dissipated heat by cooling and dissipating heat for the bearing 160.

[0053] The auxiliary heat dissipation unit 230 in the embodiment preferably comprises a plurality of heat dissipation plates 231, and the plurality of heat dissipation plates 231 are uniformly arranged on the side of the mounting plate 232 away from the bearing 160 around the axis of the rotor 120, that is, the plurality of heat dissipation plates 231 are radially arranged around the axis of the rotor 120, so as to improve the cooling efficiency for the bearing 160, thereby further prolonging the service life of the motor.

[0054] Further, the motor in the embodiment further comprises an inner shell 170, the inner shell 170 is sleeved on the outer periphery of the stator 110 and abuts between the outer shell 150 and the stator 110, the inner shell 170 is provided with a groove 222 on the side facing the outer shell 150, and the groove 222 extends spirally around the axis of the rotor 120, that is, the water cooling unit in the embodiment further comprises the groove 222 arranged on the inner shell 170, so as to form a water channel 221 between the outer shell 150 and the inner shell 170, and the water channel 221 extends spirally around the axis of the rotor 120, so as to cool the stator 110.

[0055] Preferably, the first water passage 223 and the second water passage 224 are arranged on the shell 150, in other words, the water cooling unit in the embodiment further comprises the first water passage 223 and the second water passage 224 arranged on the shell 150, the first water passage 223 and the second water passage 224 are respectively communicated with two ends of the groove 222, that is, the first water passage 223 and the second water passage 224 are respectively communicated with two ends of the water channel 221, the embodiment can inject cooling water into the water channel 221 through the first water passage 223, and the cooling water can flow out of the water channel 221 through the second water passage 224.

[0056] In order to save energy, the motor cooling system in the embodiment further comprises a control unit, the control unit is configured to control the air cooling unit and / or the water cooling unit to start or stop cooling, the control unit can control the air cooling unit to start cooling the rotor 120 when the temperature of the rotor 120 rises to be greater than the first preset temperature, and can control the air cooling unit to stop cooling when the temperature of the rotor 120 drops to be less than the second preset temperature, correspondingly, the control unit can also control the water cooling unit to start cooling when the temperature of the stator 110 rises to be greater than the third preset temperature, and can control the water cooling unit to stop cooling when the temperature of the stator 110 drops to be less than the fourth preset temperature.

[0057] In the embodiment, the control unit comprises a controller (not shown in the figure), a first temperature sensor 241 and a second temperature sensor 242, the first temperature sensor 241 and the second temperature sensor 242 are both in communication connection with the controller, the first temperature sensor 241 and the second temperature sensor 242 are respectively arranged on the rotor 120 and the stator 110, and can respectively detect the temperature of the rotor 120 and the stator 110, the first temperature sensor 241 can detect whether the temperature of the rotor 120 is greater than the first preset temperature or less than the second preset temperature, when the temperature of the rotor 120 is greater than the first preset temperature or less than the second preset temperature, the first temperature sensor 241 can send an electric signal to the controller, the controller can control the air cooling unit to start or stop cooling according to the electric signal transmitted by the first temperature sensor 241, correspondingly, the second temperature sensor 242 can detect whether the temperature of the stator 110 is greater than the third preset temperature or less than the fourth preset temperature, when the temperature of the stator 110 is greater than the third preset temperature or less than the fourth preset temperature, the second temperature sensor 242 can send an electric signal to the controller, the controller can control the water cooling unit to start or stop cooling according to the electric signal transmitted by the second temperature sensor 242.

[0058] Since the rotor 120 needs to rotate around its axis during the operation of the motor, the first temperature sensor 241 arranged on the rotor 120 cannot be directly connected with the controller through a lead wire. Therefore, the control unit in the embodiment further comprises a signal transmitter 243 connected to the rotor 120 and connected with the first temperature sensor 241 through a first lead wire 244. The first temperature sensor 241 can transmit an electric signal to the signal transmitter 243, and the signal transmitter 243 further transmits the electric signal to the controller.

[0059] Compared with the rotor 120, the stator 110 remains stationary during the operation of the motor. Therefore, the second temperature sensor 242 arranged on the stator 110 is directly connected with the controller through a second lead wire (not shown in the figure).

[0060] Based on the above description, the motor cooling system in the embodiment is provided with an auxiliary cooling unit 230 for cooling the bearing 160. As described above, the auxiliary cooling unit 230 is cooled by the air cooling unit, and the temperature of the bearing 160 also affects whether the motor can work normally. Therefore, in addition to the temperature of the rotor 120, the start or stop of the air cooling unit is also related to the temperature of the bearing 160. In order to accurately control the start or stop of the air cooling unit, the front end cover 130 and the rear end cover 140 are both provided with a temperature measuring hole 131 communicating with the inner hole thereof. The third temperature sensor 245 is arranged in the temperature measuring hole 131 of the front end cover 130 and the rear end cover 140. The third temperature sensor 245 is in communication connection with the controller. The third temperature sensor 245 can detect the temperature of the bearing 160. When the temperature of the bearing 160 is greater than a fifth preset temperature or less than a sixth preset temperature, the third temperature sensor 245 can send an electric signal to the controller. When the air cooling unit does not cool the rotor 120, the temperatures of the rotor 120 and the bearing 160 gradually increase. When only one of the temperatures of the rotor 120 and the bearing 160 is too high, the controller controls the air cooling unit to start cooling after the first temperature sensor 241 or the third temperature sensor 245 sends an electric signal to the controller. After the air cooling unit starts cooling, the temperatures of the rotor 120 and the bearing 160 gradually decrease. When the first temperature sensor 241 and the third temperature sensor 245 both send an electric signal to the controller, the controller controls the air cooling unit to stop cooling.

[0061] Obviously, the above embodiments of the present application are merely exemplary but not intended to limit the embodiments of the present application. Various obvious changes, re-adjustments and substitutions can be made by those skilled in the art without departing from the scope of the present application. It is not necessary or possible to enumerate all the embodiments. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the claims of the present application.

Claims

1. A motor cooling system, the motor comprising a stator (110) and a rotor (120), the stator (110) being sleeved on the outer periphery of the rotor (120), characterized in that, The motor cooling system comprises: an air cooling unit comprising an air inlet portion (211) and an air outlet portion (212), the air inlet portion (211) being capable of delivering cooling air into a gap between the rotor (120) and the stator (110), the cooling air delivered into the gap between the rotor (120) and the stator (110) being capable of flowing out of the air outlet portion (212); and a water cooling unit comprising a water path (221) arranged around the stator (110), cooling water being capable of flowing along the water path (221); The motor further comprises a front end cover (130), a rear end cover (140) and an outer shell (150), the front end cover (130), the stator (110) and the rear end cover (140) are all arranged around the outer periphery of the rotor (120) and are spaced apart along the axial direction of the rotor (120), the outer shell (150) is arranged around the outer periphery of the stator (110) and abuts between the front end cover (130) and the rear end cover (140), the air inlet portion (211) and the air outlet portion (212) are both arranged around the outer periphery of the outer shell (150) and are respectively provided with an air inlet opening (2111) and an air outlet opening (2121), the gap between the front end cover (130) and the stator (110) is in communication with the air inlet opening (2111), and the gap between the rear end cover (140) and the stator (110) is in communication with the air outlet opening (2121); The front end cover (130) and the rear end cover (140) are both arranged around the outer periphery of the rotor (120) through bearings (160), and the motor cooling system further comprises an auxiliary heat dissipation unit (230), the auxiliary heat dissipation unit (230) is arranged on the front end cover (130) and the rear end cover (140), and the auxiliary heat dissipation unit (230) is configured to cool the bearings (160); The motor cooling system further comprises a control unit, the control unit is configured to control the air cooling unit and / or the water cooling unit to start or stop cooling; The control unit comprises a controller, a first temperature sensor (241) and a second temperature sensor (242), the first temperature sensor (241) and the second temperature sensor (242) are both in communication connection with the controller, the first temperature sensor (241) and the second temperature sensor (242) are respectively arranged on the rotor (120) and the stator (110) and are capable of detecting the temperature of the rotor (120) and the stator (110) respectively; The first temperature sensor (241) is used for detecting whether the temperature of the rotor (120) is greater than a first preset temperature or less than a second preset temperature, when the temperature of the rotor (120) is greater than the first preset temperature, the first temperature sensor (241) sends an electric signal to the controller, and the controller controls the air cooling unit to start cooling according to the electric signal transmitted by the first temperature sensor (241); when the temperature of the rotor (120) is less than the second preset temperature, the first temperature sensor (241) sends an electric signal to the controller, and the controller controls the air cooling unit to stop cooling according to the electric signal transmitted by the first temperature sensor (241); The second temperature sensor (242) detects whether the temperature of the stator (110) is greater than a third preset temperature or less than a fourth preset temperature, when the temperature of the stator (110) is greater than the third preset temperature, the second temperature sensor (242) sends an electric signal to the controller, and the controller controls the water cooling unit to start cooling according to the electric signal transmitted by the second temperature sensor (242); when the temperature of the stator (110) is less than the fourth preset temperature, the second temperature sensor (242) sends an electric signal to the controller, and the controller controls the water cooling unit to stop cooling according to the electric signal transmitted by the second temperature sensor (242).

2. The motor cooling system of claim 1, wherein, The air inlet part (211) and the air outlet part (212) are both hollowly arranged, the shell (150) is provided with a first air vent (213) and a second air vent (214), the gap between the front end cover (130) and the stator (110) is communicated with the inside of the air inlet part (211) through the first air vent (213), and the gap between the rear end cover (140) and the stator (110) is communicated with the inside of the air outlet part (212) through the second air vent (214).

3. The motor cooling system of claim 2, wherein, The shell (150) is provided with at least two first air vents (213) and at least two second air vents (214), the at least two first air vents (213) are uniformly arranged along the circumference of the rotor (120), and the at least two second air vents (214) are uniformly arranged along the circumference of the rotor (120).

4. The motor cooling system of claim 1, wherein, The air cooling unit further comprises a fan (215) and an air-water cooler (216), the air-water cooler (216) is communicated between the air outlet (2121) and the fan (215), and is configured to cool the cooling air flowing out of the air outlet (2121), and the fan (215) is communicated between the air-water cooler (216) and the air inlet (2111).

5. The motor cooling system of claim 1, wherein, The auxiliary heat dissipation unit (230) comprises a heat dissipation plate (231) and a mounting plate (232), the front end cover (130) and the rear end cover (140) are both provided with the heat dissipation plate (231) on the side facing the stator (110), and the heat dissipation plate (231) is sleeved on the outer periphery of the bearing (160) through the mounting plate (232).

6. The motor cooling system of claim 5, wherein, The auxiliary heat dissipation unit (230) comprises a plurality of heat dissipation plates (231), and the plurality of heat dissipation plates (231) are arranged uniformly on the side of the mounting plate (232) away from the bearing (160) around the axis of the rotor (120).

7. The motor cooling system of claim 1, wherein, The control unit further comprises a signal transmitter (243) connected to the rotor (120) and connected to the first temperature sensor (241) through a first lead (244).

8. The electric machine cooling system of claim 1, wherein, The second temperature sensor (242) is connected to the controller through a second lead.

9. The motor cooling system of claim 1, wherein, The front end cover (130) and the rear end cover (140) are both provided with a temperature measuring hole (131) communicating with the inner hole thereof, and a third temperature sensor (245) is arranged in the temperature measuring hole (131) of the front end cover (130) and the rear end cover (140), the third temperature sensor (245) is in communication connection with the controller, and the third temperature sensor (245) can detect the temperature of the bearing (160).

10. The electric machine cooling system of claim 1, wherein, The motor further comprises an inner shell (170) sleeved on the outer periphery of the stator (110) and abutting between the outer shell (150) and the stator (110), the inner shell (170) is provided with a groove (222) on the side facing the outer shell (150), and the groove (222) extends spirally around the axis of the rotor (120).

11. The motor cooling system of claim 10, wherein, The outer shell (150) is provided with a first water passage (223) and a second water passage (224), and the first water passage (223) and the second water passage (224) respectively communicate with two ends of the groove (222).

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