Motor cooling system and permanent magnet motor

Abstract

The invention discloses a motor cooling system and a permanent magnet motor, relates to the technical field of motors, and can improve the cooling effect of the motor. The motor cooling system comprises a shell; the rotor is arranged in the shell; the stator is nested in the shell and is arranged outside the rotor in a sleeving manner; the cooling device comprises a cooling pipeline, the cooling pipeline is arranged between the shell and the stator, the stator is surrounded by the cooling pipeline, the cooling pipeline is used for containing a cooling medium, the cooling pipeline is provided with a spraying opening, and the spraying opening is used for spraying the cooling medium to the rotor and / or the stator. The permanent magnet motor comprises the motor cooling system in any technical scheme.

Description

Technical Field

[0001] The present application relates to the technical field of electric motors, and in particular to a motor cooling system and a permanent magnet motor. Background Art

[0002] At present, electric motors have the advantages of high efficiency, high power density, wide operating range, and precise control. However, their disadvantage of high temperature sensitivity has always been a key technical issue restricting the development of electric motors, such as permanent magnet synchronous motors, towards high power and large capacity.

[0003] When a permanent magnet synchronous motor is running, if the heat cannot be effectively dissipated, the high temperature will reduce the magnetic properties of the permanent magnet material, thus affecting the performance and life of the motor. Therefore, in practical applications, it is necessary to select the appropriate motor type based on specific needs and constraints.

[0004] The common cooling methods for motors at present mainly include natural cooling, forced cooling, and liquid cooling systems. Liquid cooling systems generally use water or ethylene glycol solution to circulate the heat generated when the motor is running, thereby keeping the motor temperature within a certain range. However, this liquid cooling circulation cooling system is not only complex in design structure, but also needs to consider factors such as the flow rate, flow rate and temperature control of the coolant to ensure the best cooling effect of the motor. At the same time, it is also necessary to ensure the reliability and stability of the cooling system to cope with various operating environments and load changes.

[0005] In summary, poor motor cooling is a problem that needs to be solved urgently. Summary of the invention

[0006] The embodiments of the present application provide a motor cooling system and a permanent magnet motor, which can improve the cooling effect of the motor.

[0007] According to a first aspect of an embodiment of the present application, a motor cooling system is provided, comprising:

[0008] case;

[0009] A rotor is disposed in the housing;

[0010] The stator is nested in the housing and sleeved outside the rotor;

[0011] The cooling device comprises a cooling pipeline, the cooling pipeline is arranged between the shell and the stator, the cooling pipeline surrounds the stator, the cooling pipeline is used to accommodate a cooling medium, and the cooling pipeline has a spray port, and the spray port is used to spray the cooling medium onto the rotor and / or the stator.

[0012] In some embodiments, the motor cooling system further comprises:

[0013] Nested structure, connected between the stator and the housing.

[0014] In some embodiments, the nested structure is a frame structure, and the spray port of the cooling pipeline is used to spray the cooling medium to the nested structure.

[0015] In some embodiments, the nested structure includes:

[0016] The stator winding is arranged on the wall surface of the stator facing the housing, and the stator winding is connected to a part of the wall surface of the stator;

[0017] Reinforcement ribs are connected between the stator winding and the housing.

[0018] In some embodiments, the stator includes a barrel-shaped structure, the stator winding is embedded in the barrel-shaped structure, and the height of the stator winding in the first direction is less than or equal to the height of the stator in the first direction;

[0019] There are multiple reinforcing ribs, and the multiple reinforcing ribs are arranged along the first direction;

[0020] The first direction is parallel to the axial direction of the stator, or the first direction is the axial direction of the stator.

[0021] In some embodiments, the cooling circuit comprises:

[0022] A first pipeline, the first pipeline is arranged on a side of the stator winding away from the stator, and the first pipeline at least surrounds an end of the stator winding;

[0023] A second pipeline is connected to the first pipeline, and a length direction of the second pipeline is parallel to the first direction;

[0024] Wherein, in the cooling pipeline, a spray port is provided on the first pipeline and / or the second pipeline;

[0025] An oil inlet pipeline is arranged on the shell, and the first pipeline, the second pipeline and the oil inlet pipeline are connected.

[0026] In some embodiments, the cooling device comprises:

[0027] An oil mist separator is arranged on the shell, and the oil mist separator is communicated with the shell;

[0028] An oil mist fan, one end of the oil mist fan is connected to the oil mist separator, and the other end of the oil mist fan is connected to the exhaust port.

[0029] In some embodiments, the cooling device further comprises:

[0030] An overflow pipe is arranged on the shell, the overflow pipe is connected to the bottom of the shell, and the diameter of the overflow pipe is larger than the diameter of the first pipeline and / or the second pipeline;

[0031] Wherein, an oil return pipeline is arranged on the shell, and the overflow pipe is connected with the oil return pipeline.

[0032] In some embodiments, the cooling medium includes liquid oil or an oil-containing solution.

[0033] According to a second aspect of an embodiment of the present application, a permanent magnet motor is provided, comprising:

[0034] The motor cooling system in any of the above technical solutions.

[0035] The beneficial effects of this application are:

[0036] The cooling device of the present application surrounds the stator, and the stator is sleeved outside the rotor. The cooling device can spray the cooling medium onto the rotor and / or the stator. The cooling medium absorbs heat from the wall of the rotor and / or the stator, thereby reducing the temperature of the rotor and / or the stator, thereby improving the cooling effect of the cooling device of the present application on the motor, and further improving the power density of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 A schematic partial structural diagram of a motor cooling system provided in an embodiment of the present application;

[0038] Figure 2 A schematic side view of a motor cooling system provided in an embodiment of the present application;

[0039] Figure 3 A schematic front view of a motor cooling system provided by an embodiment of the present application;

[0040] Figure 4 A schematic circuit diagram of a motor cooling system provided in an embodiment of the present application.

[0041] The reference numerals in the figure represent respectively:

[0042] 100, shell; 110, oil inlet pipeline; 120, oil return pipeline; 200, rotor; 300, stator; 400, cooling device; 410, cooling pipeline; 411, first pipeline; 412, second pipeline; 420, spray nozzle; 430, oil mist separator; 440, oil mist fan; 450, overflow pipe; 460, exhaust port; 500, nested structure; 510, stator winding; 520, reinforcing rib; A, first direction. DETAILED DESCRIPTION

[0043] In order to better understand the technical solutions provided by the embodiments of this specification, the technical solutions of the embodiments of this specification are described in detail below through the accompanying drawings and specific embodiments. It should be understood that the embodiments of this specification and the specific features in the embodiments are detailed descriptions of the technical solutions of the embodiments of this specification, rather than limitations on the technical solutions of this specification. In the absence of conflict, the embodiments of this specification and the technical features in the embodiments can be combined with each other.

[0044] In this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or equipment. In the absence of more restrictions, the elements limited by the statement "comprise one..." do not exclude the existence of other identical elements in the process, method, article or equipment including the elements. The term "more than two" includes two or more than two situations.

[0045] A motor cooling system and a permanent magnet motor provided in the embodiments of the present application can improve the cooling effect of the motor.

[0046] In the first aspect of this application, Figure 1 A schematic partial structural diagram of a motor cooling system provided in an embodiment of the present application, referring to Figure 1 , a motor cooling system is provided, comprising: a housing 100, a rotor 200, a stator 300 and a cooling device 400. The rotor 200 is arranged in the housing 100, the stator 300 is nested in the housing 100, and the stator 300 is sleeved outside the rotor 200.

[0047] Exemplarily, the rotor is arranged on the bearing of the motor, and the bearing can drive the rotor to rotate synchronously. The rotor of the motor can be an inner rotor rotation mode, and the core in the middle of the motor is a rotating body, that is, the rotation of the bearing of the motor can drive the rotation of the rotor, and the rotation of the rotor can generate a rotating magnetic field, and the stator moves to cut the magnetic lines of force, thereby generating an induced potential and generating current.

[0048] In some examples, reference Figure 1 The cooling device 400 includes a cooling pipeline 410, which is disposed between the housing 100 and the stator 300. The cooling pipeline 410 surrounds the stator 300, and a cooling medium can be contained in the cooling pipeline 410. At the same time, a spray port 420 is disposed on the cooling pipeline 410, through which the cooling medium in the cooling pipeline 410 can be sprayed to the rotor 200, or to the stator 300, or to both the rotor 200 and the stator 300.

[0049] For example, during the operation of the motor, the temperature of the rotor and stator will rise due to heat generation. The high temperature of the rotor and stator will affect the operating efficiency of the electrode. The cooling medium can be sprayed onto the rotor through the cooling pipeline, and the cooling medium can absorb the temperature on the rotor, thereby cooling the rotor. The cooling medium can also be sprayed onto the stator to cool the stator.

[0050] In some examples, the cooling medium can be transferred to the side wall surface of the rotor via one of the end surfaces of the rotor. Correspondingly, the cooling medium can be transferred to the stator wall surface via one of the end surfaces of the stator.

[0051] Exemplarily, the cooling medium can be provided by an external supply station, and the supply station can be connected to the cooling device through a pipeline. The cooling medium has fluidity, and the cooling medium sprayed out by the cooling device flows along the wall of the stator or rotor under the action of gravity. For example, the cooling medium can flow along the wall of the stator or rotor, thereby covering a certain area of ​​the wall, so as to perform heat exchange on the stator or rotor in a certain area, and accordingly, the number of spray devices or spray ports can be reduced without affecting the cooling effect of the cooling device.

[0052] The cooling device of the present application surrounds the stator, and the stator is sleeved outside the rotor. The cooling device is arranged between the stator and the housing. The cooling device can spray the cooling medium onto the rotor and / or the stator. The cooling medium absorbs heat from the wall surface of the rotor and / or the stator, thereby reducing the temperature of the rotor and / or the stator, so as to improve the cooling effect of the cooling device of the present application on the motor, and further improve the power density of the motor.

[0053] In some examples, the cooling device can be an integrated structure to facilitate the installation of the motor without affecting the cooling effect of the cooling device. In addition, the integrated cooling device can also reduce the maintenance difficulty and maintenance cost of the cooling system, for example, it can reduce the motor failure rate or replace the cooling device as a whole for maintenance, making maintenance operations more convenient. The integrated cooling device occupies a smaller space inside the shell, which can provide space for other components inside the shell, thereby increasing the rated capacity of the motor and achieving energy-saving effects.

[0054] In some examples, the motor cooling system further includes a nested structure connected between the stator and the housing.

[0055] Exemplarily, the nested structure of the motor is a device that can be mounted on the stator to improve the running stability of the motor. The stator and the housing are connected through the nested structure, and the nested structure ensures the installation stability of the stator to avoid the phenomenon that the rotor rotation deviates due to the unstable connection between the stator and the housing during the rotation of the rotor.

[0056] In some examples, the nested structure may be a frame structure, and the spray port of the cooling pipeline may spray the cooling medium onto the nested structure in the form of a frame.

[0057] For example, the frame-type arrangement can reduce the cost of the nested structure without affecting the fixed stability of the nested structure. At the same time, the frame-type nested structure can reserve space for the cooling pipeline, the cooling medium can be sprayed to the nested structure, and the frame structure provides space for the flow of the cooling medium.

[0058] Exemplarily, the frame structure can be a structure in which multiple support members are connected, and the space enclosed by the multiple support members can surround the stator to save components for cooling the motor without affecting the supporting effect of the nested structure on the stator, thereby achieving lightweight and high efficiency of the motor.

[0059] In some examples, reference Figure 1 The nested structure 500 includes an outer nest of a stator winding 510 and a reinforcing rib 520. The outer wall surface of the stator winding 510 is arranged on the inner wall surface of the outer nest, the stator winding 510 and the outer nest can be fixed by interference fit, and the reinforcing rib 520 is connected between the outer nest of the stator winding 510 and the housing 100.

[0060] Exemplarily, the stator winding is installed on the stator. The stator winding may be a copper wire. The copper wire may be a coil structure. The stator winding is wound around the stator.

[0061] In some examples, the stator may include a barrel-shaped structure and the stator windings may be embedded in the barrel-shaped structure.

[0062] Exemplarily, the stator may be an integrated cylindrical structure, the stator is mounted on the nested structure by interference fit, and the reinforcing ribs may be integrally cast with the shell.

[0063] In some examples, reference Figure 1 , a height of the stator winding 510 in the first direction A is less than or equal to a height of the stator 300 in the first direction A. Figure 1 The first direction A is perpendicular to Figure 1 The direction inward of the screen where the drawing is located.

[0064] Exemplary, reference Figure 1 , Figure 1 The first direction A in the Figure 1 The plane where it is located.

[0065] In some examples, reference Figure 1The height direction of the stator winding 510 may be the first direction A. There are multiple reinforcing ribs 520 , and the multiple reinforcing ribs 520 may be arranged along the first direction A, which is the height direction of the stator 300 . The reinforcing ribs 520 may be arranged along the first direction A so as to be sleeved on the outer wall surface of the stator 300 .

[0066] In some examples, the height of the reinforcing rib in the first direction may be less than or equal to the height of the stator in the first direction. The first direction is parallel to the direction of the stator axis, or the first direction is the axial direction of the stator.

[0067] In some examples, the cooling lines may overlap the stiffeners.

[0068] For example, a groove may be provided on the reinforcing rib, and the shape of the groove corresponds to the outer wall surface of the cooling pipeline. The cooling pipeline may be arranged at the groove of the reinforcing rib, so as to overlap the reinforcing rib.

[0069] Figure 2 A schematic side view of a motor cooling system provided in an embodiment of the present application. In some examples, reference Figure 2 The cooling pipeline 410 includes a first pipeline 411 and a second pipeline 412. The first pipeline 411 may be disposed on a side of the stator winding 510 away from the stator 300. The first pipeline 411 may at least surround an end of the stator winding 510. For example, the first pipeline 411 surrounds the stator winding 510 on one of the radial planes of the stator 300. The end of the stator 300 may be Figure 2 The left and right ends are shown in the figure. The housing 100 is provided with an oil inlet pipeline 110, and the first pipeline 411, the second pipeline 412 and the oil inlet pipeline 110 are connected. The diameter of the oil inlet pipeline 110 is larger than the diameter of the first pipeline 411, that is, the flow rate of the oil inlet pipeline 110 is the sum of the flow rates of the multiple first pipelines 411. The second pipeline 412 is connected to the first pipeline 411, and the length direction of the second pipeline 412 is parallel to the first direction A. The first direction A can also be the arrangement direction of the first pipeline 411 to ensure the connection between the multiple first pipelines 411.

[0070] Exemplarily, the oil inlet pipeline can transfer the cooling medium outside the housing to the inside of the housing, the cooling medium can be stored in a supply station, the oil inlet pipeline is connected to the supply station, and the cooling medium is provided to the housing through the supply station to achieve cooling of the stator and the rotor. The first pipeline can be sleeved on the outside of the stator winding, the plane where the first pipeline is located can intersect with the first direction, adjacent first pipelines are arranged along the first direction, and the second pipeline is arranged between adjacent first pipelines to form a connected cooling pipeline.

[0071] Exemplarily, by controlling the flow rate of the cooling medium through the supply station, the cooling medium transmitted to the stator and the rotor can be controlled. For example, when the rotor rotates at a faster speed, the temperature of the stator and the rotor is higher, and more cooling medium is needed to cool the stator and the rotor. Therefore, the flow rate of the cooling medium is increased through the supply station to quickly reduce the temperature of the stator and the rotor to avoid the impact of excessive temperature on the stator and the rotor.

[0072] In some examples, in the cooling pipeline, the spray port is at least provided on the first pipeline, for example, the first pipeline is provided with the spray port to spray the stator.

[0073] For example, the mist cooling medium can be sprayed onto the stator or rotor through a spray port provided on the first pipeline. The first pipeline can surround the stator or rotor, and multiple first pipelines are arranged along the axis direction of the stator. The multiple first pipelines can be interconnected, or the multiple first pipelines are independent of each other, and the first pipelines can respectively realize the spraying operation of the corresponding areas.

[0074] In some examples, the spray port is disposed on the second pipeline.

[0075] In some examples, the spray ports are disposed on the first pipeline and the second pipeline.

[0076] Exemplarily, the axial direction of the stator can be along the direction of gravity. The cooling medium sprayed from the spray outlet of the same first pipeline covers a certain area of ​​the stator or rotor under the action of gravity. The multiple first pipelines work together to cover the entire wall surface of the stator or rotor with the cooling medium. Therefore, by setting the position and spacing of the spray outlets on the first pipeline, the cooling medium covers the wall surface of the stator or rotor, that is, the contact area between the cooling medium and the rotor or stator is increased, thereby improving the cooling effect of the cooling medium.

[0077] In some examples, the cooling medium includes oil, and there is a certain temperature difference between the cooling medium and the stator or rotor. Heat exchange can be achieved between the oil and the stator, and between the oil and the rotor. The oil absorbs heat from the stator or the rotor to reduce the temperature of the stator and the rotor, thereby avoiding the influence of heat on the operating performance of the motor.

[0078] In some examples, the cooling medium may be an oily liquid substance, such as an oily liquid, oil, or an oily mixture. The cooling medium may directly contact the heat source area of ​​the motor, that is, the area with a higher temperature during the operation of the motor, and absorb the heat generated by the motor during operation through the cooling medium, thereby improving the heat exchange efficiency of the motor.

[0079] In some examples, reference Figure 2 The shell 100 is provided with an oil return pipeline 120 , and a pipe opening of the oil return pipeline 120 is provided at the shell 100 , through which the cooling medium after heat exchange in the shell 100 can be collected.

[0080] In some examples, reference Figure 2 The cooling device 400 includes an oil mist separator 430 and an oil mist fan 440. The oil mist separator 430 is disposed on the housing 100. The oil mist separator 430 can be disposed outside the housing 100 and communicated with the internal space of the housing 100. The oil mist fan 440 is disposed inside the housing 100, one end of the oil mist fan 440 is connected to the oil mist separator 430, and the other end of the oil mist fan 440 is connected to the exhaust port 460.

[0081] For example, since the oil substance vaporizes due to heat after being sprayed, the pressure inside the motor casing rises, which is not conducive to the sealing of the motor terminal box and lubricated bearings, resulting in poor oil return, oil accumulation in the bearings and other problems. The oil mist fan can extract the vaporized cooling medium from the casing, and discharge the air filtered out of the vaporized cooling medium to the outside of the motor, thereby keeping the motor casing in a slightly negative pressure state, thereby preventing the cooling medium, such as oil smoke, from entering the motor's electrical box, stator lead wire junction box or being discharged to the outside of the motor casing and other parts.

[0082] Figure 3 A schematic front view of a motor cooling system provided in an embodiment of the present application. In some examples, reference Figure 3 The oil return pipeline 120 is provided with an oil return valve, and the flow rate of the oil return pipeline 120 can be controlled by controlling the opening of the oil return valve.

[0083] For example, the motor can be a horizontal motor, and the stagnation time of the cooling medium in different parts of the motor stator is different, resulting in different cooling effects in the upper and lower parts of the motor. For example, the bottom of the motor has a shorter contact time with the cooling medium, which is not conducive to the heat exchange of the cooling medium and easily causes the phenomenon of excessively high local temperature of the motor. The oil return valve can increase the accumulated oil level at the bottom of the motor by adjusting the opening, so that the gathered cooling medium can soak part of the stator to fully cool the motor and improve the cooling effect of the motor.

[0084] In some examples, reference Figure 3 The cooling device 400 further includes an overflow pipe 450, which is disposed on the housing 100. The overflow pipe 450 can be disposed on a side of the stator 300 away from the spray port 420, so that the overflow pipe 450 is connected to the bottom of the housing 100. The overflow pipe 450 can also be connected to the oil return line 120 on the housing 100.

[0085] Exemplarily, the overflow pipe can collect excess cooling medium in the motor, where the excess cooling medium is the cooling medium that is sprayed onto the stator or the rotor and then flows through the stator or the rotor and then gathers.

[0086] In some examples, the cooling medium in the housing may be gathered at the bottom of the motor due to gravity, and the overflow pipe may be connected to the supply station through the oil return line. The supply station is used to store the cooling medium, and the supply station may be connected to the first pipeline to spray the cooling medium to the stator or rotor through the first pipeline.

[0087] In some examples, reference Figure 3 The overflow pipe 450 can be arranged in an inverted "U" shape. The overflow pipe 450 includes two pipe openings, one of which can be connected to the return pipeline, and the other can be connected to the supply station. The return oil valve is arranged on the pipeline between the two pipe openings of the overflow valve, and the pipeline where the return oil valve is located can be arranged in parallel with the overflow tank. The cooling medium in the return pipeline can be transmitted to the supply station through the overflow pipe 450. At the same time, the shape setting of the overflow pipe 450 can provide a buffering effect to prevent the cooling medium from scouring the pipe wall and causing damage to the pipeline.

[0088] In some examples, the diameter of the overflow pipe may be larger than the diameter of the first pipe.

[0089] Exemplarily, the diameter of the overflow pipe used for communication can be the same as the diameter of the return oil pipeline, and the diameter of the return oil pipeline is larger than the diameter of the first pipeline, so that the diameter of the overflow pipe is larger than the diameter of the first pipeline, and the return oil pipeline is used to collect the cooling medium gathered inside the shell.

[0090] In some examples, the diameter of the overflow pipe may be larger than the diameter of the second pipe.

[0091] Exemplarily, the second pipeline is used for communication between the first pipelines, and the instantaneous flow rate of the second pipeline is smaller than the instantaneous flow rate of the return oil pipeline, so the diameter of the second pipeline is smaller than the diameter of the return oil pipeline, and further the diameter of the second pipeline is smaller than the diameter of the return oil pipeline.

[0092] In some examples, the diameter of the overflow pipe may be larger than the diameter of the first pipe and larger than the diameter of the second pipe.

[0093] In some examples, the high position of the overflow pipe may be flush with the bottom of the motor, and the oil level in the overflow pipe is the accumulated oil level inside the motor, and the accumulated oil is the cooling medium gathered at the bottom of the motor.

[0094] In some examples, an observation window is provided on the overflow pipe, and a scale line can be marked on the observation window. When the oil level in the overflow valve is lower than the scale line, it can indicate that the accumulated oil level in the motor is too low, and the cooling medium in the motor cannot fully cool the bottom of the motor. When the oil level is higher than the scale line, it can indicate that the accumulated oil level in the motor is too high, and the oil level in the overflow pipe can be reduced by controlling the opening of the return oil valve and increasing the return oil flow rate.

[0095] Figure 4A schematic circuit diagram of a motor cooling system provided in an embodiment of the present application. In some examples, reference Figure 4 The cooling medium in the oil tank of the supply station is extracted by an oil pump, the cooling medium is cooled by a cooler, and impurities in the cooling medium are filtered by a filter. The cooling medium is sprayed onto the stator and / or rotor through a compressor and / or an electric motor to realize the cooling function of the motor.

[0096] In some examples, the motor of the present application is a permanent magnet synchronous motor.

[0097] A second aspect of the present application provides a permanent magnet motor, comprising a motor cooling system in any of the above technical solutions.

[0098] It should be noted that in the above embodiments, the description of each embodiment has its own emphasis, and for parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0099] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

[0100] Although the preferred embodiments of this specification have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. 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 this specification.

[0101] Obviously, those skilled in the art can make various changes and modifications to this specification without departing from the spirit and scope of this specification. Thus, if these modifications and variations of this specification fall within the scope of the claims of this specification and their equivalents, this specification is also intended to include these modifications and variations.

Claims

1. A motor cooling system, characterized in that: include: case; A rotor is disposed in the housing; A stator is nested in the housing and sleeved outside the rotor; A cooling device, wherein the cooling device comprises a cooling pipeline, wherein the cooling pipeline is arranged between the housing and the stator, the cooling pipeline surrounds the stator, the cooling pipeline is used to accommodate a cooling medium, and the cooling pipeline has a spray port, and the spray port is used to spray the cooling medium onto the rotor and / or the stator.

2. The motor cooling system according to claim 1, characterized in that: The motor cooling system further comprises: The nested structure is connected between the stator and the housing.

3. The motor cooling system according to claim 2, characterized in that: The nested structure is a frame structure, and the spray port of the cooling pipeline is used to spray the cooling medium onto the nested structure.

4. The motor cooling system according to claim 3, characterized in that: The nested structure includes: A stator winding is arranged on a wall surface of the stator facing the housing, and the stator winding is connected to a part of the wall surface of the stator; A reinforcing rib is connected between the stator winding and the housing.

5. The motor cooling system according to claim 4, characterized in that: The stator comprises a barrel-shaped structure, the stator winding is embedded in the barrel-shaped structure, and the height of the stator winding in the first direction is less than or equal to the height of the stator in the first direction; There are multiple reinforcing ribs, and the multiple reinforcing ribs are arranged along the first direction; The first direction is parallel to the axial direction of the stator, or the first direction is the axial direction of the stator.

6. The motor cooling system according to claim 5, characterized in that: The cooling circuit comprises: A first pipeline, wherein the first pipeline is arranged on a side of the stator winding away from the stator, and the first pipeline at least surrounds an end of the stator winding; A second pipeline is connected to the first pipeline, and the length direction of the second pipeline is parallel to the first direction; Wherein, in the cooling pipeline, the spray port is arranged on the first pipeline and / or the second pipeline; The housing is provided with an oil inlet pipeline, and the first pipeline, the second pipeline and the oil inlet pipeline are connected.

7. The motor cooling system according to claim 6, characterized in that: The cooling device comprises: An oil mist separator is disposed on the housing, and the oil mist separator is communicated with the housing; An oil mist fan, one end of which is connected to the oil mist separator, and the other end of which is connected to an exhaust port.

8. The motor cooling system according to claim 7, characterized in that: The cooling device also includes: an overflow pipe, arranged on the shell, the overflow pipe being connected to the bottom of the shell, and having a diameter greater than that of the first pipeline and / or the second pipeline; Wherein, an oil return pipeline is arranged on the shell, and the overflow pipe is connected with the oil return pipeline.

9. The motor cooling system according to claim 1, characterized in that: The cooling medium includes liquid oil or an oil-containing solution.

10. A permanent magnet motor, characterized in that: Includes a motor cooling system as described in any one of 1 to 9 above.

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