Motor cooling system

Abstract

The present application relates to a motor cooling system, including: a cooling motor, a cooling channel, an oil spray pipe and a driving device; the cooling motor includes a housing and a stator; the stator is mounted on the housing; the cooling channel is located between the outer wall surface of the stator and the inner cavity of the housing; the oil spray pipe is arranged in the cooling channel; a plurality of oil spray holes are provided on the oil spray pipe; the driving device is connected to the oil spray pipe; the driving device is configured to drive the oil spray pipe to rotate in the cooling channel. The oil spray pipe arranged in the present application can rotate inside the stator under the drive of the driving device, and the spray angle of the oil spray pipe changes with its rotation, which improves the cooling uniformity of the oil spray pipe during spray cooling, expands the coverage of spray cooling, improves the heat dissipation and cooling efficiency of the motor, and is beneficial to the improvement of the overall performance of the motor.

Description

Technical Field

[0001] The present application relates to the technical field of new energy vehicles, and in particular to a motor cooling system. Background Art

[0002] At present, as the speed of the electric drive system of the motor in new energy vehicles continues to increase, more heat is generated accordingly as the motor loss increases. Therefore, in order to further improve the power performance, more difficult motor heat dissipation problems will be faced.

[0003] There are two main ways to dissipate heat from the motor: water cooling and oil cooling. Considering that oil cooling has more complete contact with the components inside the cooling motor, it can better adapt to the trend of high integration of electric drive systems, has excellent cooling effect, and has better application prospects.

[0004] At present, oil cooling can generally be achieved by setting up fixed cooling oil channels and then introducing cooling oil into the cooling oil channels for cooling. However, this method often makes it difficult to ensure uniform heat dissipation, and the cooling efficiency still needs to be further improved. Summary of the invention

[0005] Based on this, it is necessary to provide a motor cooling system to address the problem of low motor heat dissipation efficiency.

[0006] In one aspect of the present application, a motor cooling system is provided, comprising:

[0007] A cooling motor, the cooling motor comprising a housing and a stator; the stator is mounted on the housing;

[0008] A cooling channel, located between the outer wall surface of the stator and the inner cavity of the shell;

[0009] An oil injection pipe, the oil injection pipe is arranged in the cooling channel; a plurality of oil injection holes are formed on the oil injection pipe; and

[0010] A driving device is connected to the fuel injection pipe; the driving device is configured to drive the fuel injection pipe to rotate in the cooling channel.

[0011] In one of the embodiments, the driving device is configured to drive the fuel injection pipe to rotate around the axial direction of the fuel injection pipe; the driving device includes a driving motor, the driving motor is mounted on the housing of the cooling motor, and the output shaft of the driving motor is coaxially mounted on the fuel injection pipe.

[0012] In one of the embodiments, the outer axial surface of the output shaft of the driving motor is interference fit with the inner wall surface of the fuel injection pipe.

[0013] In one embodiment, the driving device is configured to drive the oil injection pipe to rotate around the rotor shaft of the cooling motor, wherein the rotor shaft is coaxially arranged with the stator; the driving device includes a reducer, the rotor shaft of the cooling motor is coaxially connected to the sun gear of the reducer, the oil injection pipe is connected to the planetary gear of the reducer, and the sun gear of the reducer is meshed with the planetary gear of the reducer.

[0014] In one of the embodiments, a plurality of the oil injection pipes are evenly distributed along the circumference of the stator.

[0015] In one of the embodiments, a plurality of the fuel injection holes are evenly distributed on the fuel injection pipe along the axial direction of the fuel injection pipe.

[0016] In one of the embodiments, the plurality of fuel injection holes are evenly distributed on the fuel injection pipe along the circumference of the fuel injection pipe.

[0017] In one embodiment, the axial direction of each of the fuel injection holes is perpendicular to the axial direction of the fuel injection pipe.

[0018] In one of the embodiments, there is an angle between the axial direction of each of the fuel injection holes and the axial direction of the fuel injection pipe.

[0019] In one embodiment, it also includes:

[0020] A controller is configured to adjust the operating state of the drive device when the real-time operating state of the cooling motor does not conform to the preset operating state of the cooling motor, so that the real-time operating state of the cooling motor conforms to the preset operating state of the cooling motor.

[0021] In the present application, the fuel injection pipe can rotate inside the stator under the drive of the driving device, and the spray angle of the fuel injection pipe changes with its rotation, thereby improving the cooling uniformity of the fuel injection pipe during spray cooling, expanding the coverage range of spray cooling, and improving the heat dissipation cooling efficiency of the motor, which is beneficial to improving the overall performance of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A partial structural schematic diagram of a cooling motor and a driving motor installed on the cooling motor in a motor cooling system provided in an embodiment of the present application is shown.

[0023] Figure 2 Shows Figure 1 Schematic diagram of the structure inside the casing of the mid-cooled motor.

[0024] Figure 3 Shows Figure 2 Schematic diagram of the cross-sectional structure of AA.

[0025] Figure Number:

[0026] 100-Cooling motor;

[0027] 101- housing;

[0028] 102- stator;

[0029] 200-cooling channel;

[0030] 300-injection pipe;

[0031] 400-driving motor;

[0032] 401 - output shaft of the drive motor. DETAILED DESCRIPTION

[0033] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0034] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0035] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0036] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0037] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0038] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0039] An embodiment of the present application provides a motor cooling system, comprising: a cooling motor, a cooling channel, an oil injection pipe and a driving device; the cooling motor comprises a shell and a stator; the stator is mounted on the shell; the cooling channel is located between the outer wall surface of the stator and the inner cavity of the shell; the oil injection pipe is arranged in the cooling channel; a plurality of oil injection holes are provided on the oil injection pipe; the driving device is connected to the oil injection pipe; the driving device is configured to drive the oil injection pipe to rotate in the cooling channel.

[0040] The cooling motor involved in this embodiment includes a housing, a rotor shaft, a rotor and a stator, and the rotor shaft, the rotor and the stator are sequentially mounted from the inside to the outside, wherein the stator can be fixedly mounted on the inner cavity of the housing through a connector. It should be noted here that the outer wall surface of the stator and the inner cavity of the housing are not tightly fitted, but a cooling channel is left between the outer wall surface of the stator and the inner cavity of the housing. It can be understood that the cooling channel is arranged circumferentially around the stator.

[0041] In this embodiment, the oil spray pipe can rotate inside the stator under the drive of the driving device, and the spray angle of the oil spray pipe changes with its rotation, thereby improving the cooling uniformity of the oil spray pipe during spray cooling, expanding the coverage of spray cooling, and improving the heat dissipation cooling efficiency of the motor, which is beneficial to improving the overall performance of the motor.

[0042] See also Figures 1 to 3 , Figure 1 A partial structural schematic diagram of a cooling motor and a driving motor installed on the cooling motor in a motor cooling system provided by an embodiment of the present application is shown. Figure 2 Shows Figure 1 Schematic diagram of the structure inside the housing of the medium-cooled motor. Figure 3 Shows Figure 2 Schematic diagram of the cross-sectional structure of AA in the figure. The motor cooling system provided in one embodiment of the present application comprises: a cooling motor 100, a cooling channel 200, an oil injection pipe 300 and a driving motor 400. The stator is mounted on the housing 101; the cooling channel 200 is located between the outer wall surface of the stator and the inner cavity of the housing 101; the oil injection pipe 300 is arranged in the cooling channel 200; and a plurality of oil injection holes are provided on the oil injection pipe 300. The driving motor 400 is mounted outside the housing 101 of the cooling motor 100, the output shaft of the cooling motor 100 extends into the inner cavity of the cooling housing 101 and the output shaft of the cooling motor 100 is coaxially sleeved with the oil injection pipe 300. The driving motor 400 can drive the oil injection pipe 300 to rotate around the axis direction of the oil injection pipe 300. In this embodiment, the driving device can drive the oil injection pipe 300 to rotate around its own axis direction.

[0043] In some embodiments, the drive motor 400 can be mounted on the end cover of the cooling motor 100, where the end cover is a rear cover mounted behind the housing 101 of the cooling motor 100. The output shaft of the cooling motor 100 extends through the end cover into the inner cavity of the housing 101 of the cooling motor 100.

[0044] In an optional embodiment, the output shaft of the cooling motor 100 may extend into the inner cavity of the housing 101 of the cooling motor 100 perpendicularly to the end cover of the cooling motor 100 .

[0045] In an optional embodiment, the end cover and the housing 101 of the cooling motor 100 may be connected by fasteners. It should be noted that other assembly methods may also be used between the end cover and the housing 101 of the cooling motor 100, which are not listed here one by one.

[0046] In some of the embodiments, the motor cooling system also involves the arrangement of an oil supply component, which will not be elaborated in detail here, wherein the oil supply component can directly pass the cooling oil into the oil injection pipe 300 to provide cooling oil to the oil injection pipe 300.

[0047] In some embodiments, the outer axial surface of the output shaft 401 of the drive motor is interference-fitted with the inner wall surface of the fuel injection pipe 300. During the assembly and installation of the output shaft 401 of the drive motor and the fuel injection pipe 300, due to the interference fit between the outer axial surface of the output shaft 401 of the drive motor and the inner wall surface of the fuel injection pipe 300, the aperture of the inner wall surface of the fuel injection pipe 300 is enlarged and deformed during the sleeve process until the fuel injection pipe 300 is completely sleeved on the outer axial surface of the output shaft 401 of the drive motor. When the aperture of the inner wall surface of the fuel injection pipe 300 is restored, a clamping force can be generated on the output shaft 401 of the drive motor, so that the output shaft 401 of the drive motor and the fuel injection pipe 300 are tightly matched and connected, preventing the output shaft 401 of the drive motor and the fuel injection pipe 300 from falling off and causing oil leakage and other problems.

[0048] In an optional embodiment, the driving motor 400 may be a stepping motor or other power device that can drive the fuel injection pipe 300 to rotate, which is not specifically limited here.

[0049] In some of the embodiments, a plurality of oil spray pipes 300 may be arranged in the motor cooling system, and the plurality of oil spray pipes 300 may be distributed along the circumference of the stator to expand the coverage of the cooling spray of the oil spray pipes 300, thereby improving the cooling uniformity of the oil spray pipes 300 during spray cooling and improving the heat dissipation cooling efficiency of the motor.

[0050] Optionally, the plurality of oil injection pipes 300 are evenly distributed along the circumference of the stator. It should be noted that in some embodiments, the arrangement positions of the plurality of oil injection pipes 300 can also be adjusted according to the cooling spray coverage, and are not limited to being evenly distributed along the circumference of the stator.

[0051] In some of the embodiments, multiple oil spray holes can be evenly distributed on the oil spray pipe 300 along the axial direction of the oil spray pipe 300 to expand the coverage of the cooling spray of the oil spray pipe 300, improve the cooling uniformity of the oil spray pipe 300 during spray cooling, and improve the heat dissipation cooling efficiency of the motor.

[0052] In some of the embodiments, multiple oil spray holes can be evenly distributed on the oil spray pipe 300 along the circumference of the oil spray pipe 300 to expand the coverage of the cooling spray of the oil spray pipe 300, improve the cooling uniformity of the oil spray pipe 300 during spray cooling, and improve the heat dissipation cooling efficiency of the motor.

[0053] In some of the embodiments, multiple fuel injection holes can be evenly distributed on the fuel injection pipe 300 along the axial direction of the fuel injection pipe 300 and the circumferential direction of the fuel injection pipe 300, so as to expand the coverage of the cooling spray of the fuel injection pipe 300, improve the cooling uniformity of the fuel injection pipe 300 during spray cooling, and improve the heat dissipation cooling efficiency of the motor.

[0054] In some of the embodiments, the axial direction of each of the oil spray holes is perpendicular to the axial direction of the oil spray pipe 300, so as to expand the coverage of the cooling spray of the oil spray pipe 300, improve the cooling uniformity of the oil spray pipe 300 during spray cooling, and improve the heat dissipation cooling efficiency of the motor.

[0055] In some embodiments, there is an angle between the axis direction of each of the oil spray holes and the axis direction of the oil spray pipe 300, so as to expand the coverage of the cooling spray of the oil spray pipe 300, improve the cooling uniformity of the oil spray pipe 300 during spray cooling, and improve the heat dissipation cooling efficiency of the motor. It should be noted that the specific angle of the angle can be adjusted according to the needs of the cooling spray coverage, and no specific limitation is made here.

[0056] In some of the embodiments, the axial direction of each of the oil spray holes can be either perpendicular to the axial direction of the oil spray pipe 300 or have an angle with the axial direction of the oil spray pipe 300, so as to expand the coverage of the cooling spray of the oil spray pipe 300, improve the cooling uniformity of the oil spray pipe 300 during spray cooling, and improve the heat dissipation cooling efficiency of the motor.

[0057] In some embodiments, the motor cooling system also includes: a controller, which is configured to adjust the operating state of the drive device when the real-time operating state of the cooling motor 100 does not conform to the preset operating state of the cooling motor 100, so that the real-time operating state of the cooling motor 100 conforms to the preset operating state of the cooling motor 100.

[0058] The controller includes an acquisition unit, a second processing unit, and a third processing unit. The acquisition unit is configured to acquire the real-time operating state of the cooling motor. The first processing unit is configured to determine whether the real-time operating state of the cooling motor conforms to the preset operating state of the cooling motor. The second processing unit is configured to adjust the operating state of the drive device when the first processing unit determines that the real-time operating state of the cooling motor does not conform to the preset operating state of the cooling motor.

[0059] In this embodiment, the acquisition unit acquires the real-time operating status of the cooling motor, where the real-time operating status may include parameters such as real-time temperature and cooling efficiency that can express the real-time operating status of the cooling motor, which are not listed one by one here. The first processing unit can determine whether the real-time operating status of the cooling motor meets the preset operating status of the cooling motor. If it is determined that the real-time operating status of the cooling motor does not meet the preset operating status of the cooling motor, the motor cooling system needs to be adjusted. Then the second processing unit adjusts the operating status of the drive device, where the operating status of the drive device can be parameters such as the rotation rate and rotation angle of the drive motor 400 that can improve the spraying effect, which are not listed one by one here. After the second processing unit completes the adjustment, the acquisition unit re-acquires the real-time operating status of the cooling motor, and the first processing unit determines whether the real-time operating status of the cooling motor is consistent with the preset operating status of the cooling motor. If the real-time operating status of the cooling motor is consistent with the preset operating status of the cooling motor, no further adjustment is required. If the real-time operating status of the cooling motor still does not meet the preset operating status of the cooling motor, the second processing unit is required to adjust the operating status of the drive device, and repeat the above steps until the real-time operating status of the cooling motor is consistent with the preset operating status of the cooling motor and the adjustment is stopped.

[0060] Another embodiment of the present application provides a motor cooling system, including: a cooling motor, a cooling channel, an oil spray pipe and a reducer. The stator is mounted on the housing; the cooling channel is located between the outer wall of the stator and the inner cavity of the housing; the oil spray pipe is arranged in the cooling channel; and a plurality of oil spray holes are provided on the oil spray pipe. The rotor shaft of the cooling motor is coaxially connected to the sun gear of the reducer, the oil spray pipe is connected to the planetary gear of the reducer, and the sun gear of the reducer is meshed with the planetary gear of the reducer. The reducer can drive the oil spray pipe to rotate around the rotor shaft of the cooling motor. In this embodiment, the reducer can drive the oil spray pipe to revolve around the rotor shaft of the cooling motor in the cooling channel.

[0061] In some of the embodiments, the motor cooling system also involves the arrangement of an oil supply component, which will not be elaborated in detail here, wherein the oil supply component can directly pass the cooling oil into the oil injection pipe to provide cooling oil to the oil injection pipe.

[0062] In some of the embodiments, multiple oil spray pipes can be arranged in the motor cooling system, and the multiple oil spray pipes can be distributed along the circumference of the stator to expand the coverage of the cooling spray of the oil spray pipes, improve the cooling uniformity of the oil spray pipes during spray cooling, and improve the heat dissipation cooling efficiency of the motor.

[0063] Optionally, the plurality of oil spray pipes are evenly distributed along the circumference of the stator. It should be noted that in some embodiments, the arrangement positions of the plurality of oil spray pipes can also be adjusted according to the cooling spray coverage, and are not limited to being evenly distributed along the circumference of the stator.

[0064] In some of the embodiments, multiple fuel injection holes can be evenly distributed on the fuel injection pipe along the axial direction of the fuel injection pipe to expand the coverage of the fuel injection pipe cooling spray, improve the cooling uniformity of the fuel injection pipe during spray cooling, and improve the heat dissipation cooling efficiency of the motor.

[0065] In some of the embodiments, multiple oil spray holes can be evenly distributed on the oil spray pipe along the circumference of the oil spray pipe to expand the coverage of the oil spray pipe cooling spray, improve the cooling uniformity of the oil spray pipe during spray cooling, and improve the heat dissipation cooling efficiency of the motor.

[0066] In some of the embodiments, multiple fuel injection holes can be evenly distributed on the fuel injection pipe along the axial direction and the circumferential direction of the fuel injection pipe at the same time, so as to expand the coverage of the fuel injection pipe cooling spray, improve the cooling uniformity of the fuel injection pipe during spray cooling, and improve the heat dissipation cooling efficiency of the motor.

[0067] In some of the embodiments, the axial direction of each of the oil spray holes is perpendicular to the axial direction of the oil spray pipe, so as to expand the coverage of the cooling spray of the oil spray pipe, improve the cooling uniformity of the oil spray pipe during spray cooling, and improve the heat dissipation cooling efficiency of the motor.

[0068] In some embodiments, there is an angle between the axis direction of each of the oil spray holes and the axis direction of the oil spray pipe, so as to expand the coverage of the cooling spray of the oil spray pipe, improve the cooling uniformity of the oil spray pipe during spray cooling, and improve the heat dissipation cooling efficiency of the motor. It should be noted that the specific angle of the angle can be adjusted according to the needs of the cooling spray coverage, and no specific limitation is made here.

[0069] In some of the embodiments, the axial direction of each of the oil spray holes can be either perpendicular to the axial direction of the oil spray pipe or have an angle with the axial direction of the oil spray pipe, so as to expand the coverage of the cooling spray of the oil spray pipe, improve the cooling uniformity of the oil spray pipe during spray cooling, and improve the heat dissipation cooling efficiency of the motor.

[0070] In some embodiments, the motor cooling system also includes: a controller, which is configured to adjust the operating state of the drive device when the real-time operating state of the cooling motor does not conform to the preset operating state of the cooling motor, so that the real-time operating state of the cooling motor conforms to the preset operating state of the cooling motor.

[0071] The controller includes an acquisition unit, a second processing unit, and a third processing unit. The acquisition unit is configured to acquire the real-time operating state of the cooling motor. The first processing unit is configured to determine whether the real-time operating state of the cooling motor conforms to the preset operating state of the cooling motor. The second processing unit is configured to adjust the operating state of the drive device when the first processing unit determines that the real-time operating state of the cooling motor does not conform to the preset operating state of the cooling motor.

[0072] In this embodiment, the acquisition unit acquires the real-time operating status of the cooling motor, where the real-time operating status may include parameters such as real-time temperature and cooling efficiency that can express the real-time operating status of the cooling motor, which are not listed one by one here. The first processing unit can determine whether the real-time operating status of the cooling motor meets the preset operating status of the cooling motor. If it is determined that the real-time operating status of the cooling motor does not meet the preset operating status of the cooling motor, the motor cooling system needs to be adjusted. Then the second processing unit adjusts the operating status of the drive device, where the operating status of the drive device can be the rotation rate and rotation angle of the planetary gear of the reducer. Parameters that can improve the spraying effect, which are not listed one by one here. After the second processing unit completes the adjustment, the acquisition unit re-acquires the real-time operating status of the cooling motor, and the first processing unit determines whether the real-time operating status of the cooling motor is consistent with the preset operating status of the cooling motor. If the real-time operating status of the cooling motor is consistent with the preset operating status of the cooling motor, no further adjustment is required. If the real-time operating status of the cooling motor still does not meet the preset operating status of the cooling motor, the second processing unit is required to adjust the operating status of the drive device, and repeat the above steps until the real-time operating status of the cooling motor is consistent with the preset operating status of the cooling motor and the adjustment is stopped.

[0073] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0074] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A motor cooling system, characterized in that: include: A cooling motor, the cooling motor comprising a housing and a stator; the stator is mounted on the housing; A cooling channel is located between the outer wall surface of the stator and the inner cavity of the shell; an oil injection pipe, the oil injection pipe being arranged in the cooling channel; The fuel injection pipe is provided with a plurality of fuel injection holes; as well as A driving device, the driving device is connected to the fuel injection pipe; the driving device is configured to drive the fuel injection pipe to rotate in the cooling channel; The driving device is configured to drive the fuel injection pipe to rotate around the axial direction of the fuel injection pipe; the driving device includes a driving motor, the driving motor is mounted on the housing of the cooling motor, and the output shaft of the driving motor is coaxially sleeved on the fuel injection pipe.

2. The motor cooling system according to claim 1, characterized in that: The driving motor is a stepper motor.

3. The motor cooling system according to claim 2, characterized in that: The outer axial surface of the output shaft of the driving motor is interference-fitted with the inner wall surface of the fuel injection pipe.

4. The motor cooling system according to claim 1, characterized in that: The driving device is configured to drive the oil injection pipe to rotate around the rotor shaft of the cooling motor, wherein the rotor shaft is coaxially arranged with the stator; the driving device includes a reducer, the rotor shaft of the cooling motor is coaxially connected to the sun gear of the reducer, the oil injection pipe is connected to the planetary gear of the reducer, and the sun gear of the reducer is meshed with the planetary gear of the reducer.

5. The motor cooling system according to claim 1, characterized in that: A plurality of the oil injection pipes are evenly distributed along the circumference of the stator.

6. The motor cooling system according to claim 1, characterized in that: A plurality of the fuel injection holes are evenly distributed on the fuel injection pipe along the axial direction of the fuel injection pipe.

7. The motor cooling system according to claim 1, characterized in that: A plurality of the fuel injection holes are evenly distributed on the fuel injection pipe along the circumference of the fuel injection pipe.

8. The motor cooling system according to claim 1, characterized in that: The axial direction of each of the fuel injection holes is perpendicular to the axial direction of the fuel injection pipe.

9. The motor cooling system according to claim 1, characterized in that: There is an angle between the axial direction of each of the fuel injection holes and the axial direction of the fuel injection pipe.

10. The motor cooling system according to any one of claims 1 to 9, characterized in that: Also includes: A controller is configured to adjust the operating state of the drive device when the real-time operating state of the cooling motor does not conform to the preset operating state of the cooling motor, so that the real-time operating state of the cooling motor conforms to the preset operating state of the cooling motor.

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