Motor cooling system and motor

Abstract

The utility model relates to a motor cooling system and a motor, the motor comprises a casing, a rotating shaft and an end cover, the end cover is arranged at one end of the casing, the middle of the end cover is provided with a shaft hole for the rotating shaft to pass through, and the end cover is provided with a bearing seat for mounting a bearing at the shaft hole; the motor cooling system comprises a first water gap and a second water gap which are arranged on the casing and / or the end cover, and a water jacket arranged in the casing; a first flow channel communicated with the first water opening is defined between the water jacket and the machine shell. A second flow channel is defined between the end wall of the water jacket and the inner side of the end cover, the bearing seat is located in the second flow channel, and the first end of the second flow channel is communicated with the second end of the first flow channel; a third flow channel is communicated between the second end of the second flow channel and the second water opening, and at least part of the third flow channel is located in the rotating shaft. According to the scheme, the stator cooling water path and the rotor cooling water path are connected into a circulating flow path, so that the stator, the rotor and the bearing of the motor can be cooled, the comprehensive cooling effect of the motor is better, and the cooling efficiency is higher.

Description

Technical Field

[0001] The present application relates to the technical field of automobiles, and particularly to an electric motor cooling system and an electric motor. Background Art

[0002] With the rapid development of the domestic new energy vehicle market, the competition in technology and cost has become particularly fierce; as one of the cores of new energy vehicles, the update of the technology and the control of the cost of the electric motor have become more important. The asynchronous induction motor has a simple structure, low manufacturing cost, reliable operation, and excellent performance under low load conditions and average efficiency; under the application of high-power, high-speed and high torque density motors, there is a high temperature rise during the operation of the motor, which seriously affects the performance, efficiency, life and reliability of the motor. Therefore, how to design the cooling system of the electric motor to have good cooling effect, simple structure and low manufacturing cost is an urgent problem to be solved at present.

[0003] At present, the common asynchronous water-cooled motor cooling system uses the housing and the cooling water channel to cool the stator, which cannot cool the rotor and even less the motor bearing, resulting in the rotor and the bearing being in a high temperature state for a long time, leading to a decrease in the working efficiency of the motor and even a failure due to high temperature ablation of the bearing. Summary of the Utility Model

[0004] Based on this, the present utility model provides an electric motor cooling system and an electric motor to solve the problems of poor cooling effect and uneven cooling of the existing electric motor cooling system.

[0005] On the one hand, an electric motor cooling system provided by the present utility model is used for an electric motor, the electric motor includes a housing, a rotating shaft and an end cover, the end cover is arranged at one end of the housing, and a shaft hole for the rotating shaft to pass through is arranged in the middle of the end cover, and a bearing seat for installing a bearing is formed at the position of the shaft hole of the end cover;

[0006] The electric motor cooling system includes a first water port and a second water port arranged on the housing and / or the end cover and a water jacket arranged in the housing;

[0007] A first flow channel with a first end communicating with the first water port is formed between the outer periphery of the water jacket and the inner wall of the housing, and the first flow channel is used for guiding the coolant along the axial direction of the housing;

[0008] A second flow channel is formed between the end wall of the water jacket and the inner side of the end cover, the bearing seat is located in the second flow channel, and the first end of the second flow channel communicates with the second end of the first flow channel;

[0009] A third flow channel communicating between the second end of the second flow channel and the second water port is at least partially located in the rotating shaft.

[0010] In one embodiment, the bearing housing extends axially inward along the shaft hole;

[0011] An annular platform extending axially inward is provided on the end wall of the water jacket. The annular platform is sleeved on the bearing housing, and there is an annular gap between at least part of the annular platform and the outer side of the bearing housing to form an annular flow passage between the bearing housing and the annular platform. The annular flow passage is part of the second flow passage, and the side of the annular platform away from the end cover is hermetically arranged with the outer side of the bearing housing.

[0012] In one embodiment, an annular sealing rib plate is protrudingly provided on the end wall of the water jacket. The sealing rib plate is hermetically arranged with the inner wall of the end cover so that the part of the end wall of the water jacket located inside the sealing rib plate and the inner wall of the end cover enclose the second flow passage;

[0013] A notch is provided at the position of the sealing rib plate opposite to the second end of the first flow passage. The first flow passage is communicated with the second flow passage through the notch, and the third flow passage is communicated with the side of the second flow passage away from the notch.

[0014] In one embodiment, a plurality of flow guiding rib plates are further provided on the end wall of the water jacket. A flow dividing passage extending from the notch to the connection part of the second flow passage and the third flow passage is formed between every two adjacent flow guiding rib plates.

[0015] In one embodiment, the annular flow passage is located in at least one of the flow dividing passages.

[0016] In one embodiment, the third flow passage includes a first passage, a second passage and a third passage;

[0017] Both the first passage and the third passage are provided at the end of the motor, and the first passage is connected to the second flow passage, and the third passage is connected to the second water port;

[0018] The second passage includes a shaft hole opened in the rotating shaft. The shaft hole is communicated with one end of the first passage away from the second flow passage and one end of the third passage away from the second water port.

[0019] In one embodiment, a flow divider is provided outside the end cover. Both the first passage and the third passage are provided in the flow divider;

[0020] A first communication hole connecting the first passage and the second flow passage and a second communication hole connecting the third passage and the second water port are provided on the end cover;

[0021] A connection hole is provided in the middle of the shunt, and the end of the rotating shaft is rotatably and sealingly arranged in the connection hole. The rotating shaft hole and the third channel are both communicated with the connection hole.

[0022] A communicating pipe is further arranged in the rotating shaft hole. One end of the communicating pipe is communicated with the first channel, and the other end extends to the side of the rotating shaft hole far from the first channel and is communicated with the rotating shaft hole.

[0023] In one embodiment, the first flow channel is spiral along the axial direction of the motor.

[0024] In one embodiment, the water jacket, the end cover and the machine shell are fixedly integrated.

[0025] On the other hand, the present invention also provides a motor, which includes the motor cooling system of any one of the above embodiments.

[0026] The present invention has at least the following beneficial effects compared with the prior art:

[0027] In this motor cooling system, by providing a first flow channel flowing along the stator housing, a second flow channel passing through the bearing seat, and a third flow channel at least partially located in the rotating shaft, and connecting the first flow channel, the second flow channel and the third flow channel in sequence, the stator cooling water path and the rotor cooling water path are connected into a circulating flow path. Compared with the prior art of locally cooling the stator, this motor cooling system can cool the stator housing, bearings and rotor in sequence through the coolant, making the cooling of the motor more comprehensive and balanced, avoiding local high temperatures of the rotor and bearings, having a better comprehensive cooling effect and higher cooling efficiency. Description of the Drawings

[0028] Figure 1 It is a schematic structural diagram of the motor cooling system in one embodiment;

[0029] Figure 2 It is a schematic structural diagram of the water jacket of the motor cooling system in one embodiment.

[0030] The reference numerals in the drawings of the specification include: machine shell 1, rotating shaft 2, end cover 3, bearing seat 4, first water inlet 5, second water inlet 6, water jacket 7, first flow channel 8, flow channel groove 81, second flow channel 9, third flow channel 10, first channel 101, second channel 102, third channel 103, ring platform 11, annular flow channel 12, sealing rib plate 13, notch 14, guiding rib plate 15, shunt 16, first communication hole 17, second communication hole 18, connection hole 19, communicating pipe 20. Detailed Embodiments

[0031] In order to make the objectives, technical solutions and advantages of the present application more clear and understandable, the present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0032] It should be noted that the illustrations provided in this embodiment only schematically illustrate the basic concept of the present utility model.

[0033] The structures, ratios, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those familiar with this technology to understand and read, and are not used to limit the limiting conditions under which the present utility model can be implemented. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effects that the present utility model can produce and the objectives that can be achieved, should still fall within the scope covered by the technical content disclosed by the present utility model.

[0034] The orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "middle", "longitudinal", "transverse", "horizontal", "inner", "outer", "radial", "circumferential", etc. cited in this specification is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation of the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0035] The existing motor water cooling system lacks cooling for the rotor and bearings, causing the rotor and bearings to be in a high-temperature state for a long time, resulting in a decrease in the working efficiency of the motor and even causing failures such as high-temperature ablation of the bearings.

[0036] In view of this, the embodiment of the present utility model provides a motor cooling system, which can provide cooling for the stator, rotor and bearings of the motor, improving the comprehensive cooling effect of the motor.

[0037] Since the motor cooling system provided in this embodiment needs to be combined with the motor, the following will first briefly describe some structures of the motor.

[0038] Combined Figure 1 As shown, the motor mainly includes a stator (not marked in the figure), a rotor (not marked in the figure), a housing 1 and an end cover 3. Among them, the rotor includes a rotating shaft 2. The end cover 3 is fixed to the end of the housing 1 by an integrally formed or welded fixing method. A shaft hole for the rotating shaft 2 to pass through is provided in the middle of the end cover 3, and a bearing seat 4 for installing a bearing is formed at the shaft hole of the end cover 3.

[0039] For the motor combined with the above structural design, a motor cooling system provided by an embodiment of the present utility model includes: a first water port 5 and a second water port 6 provided on the housing 1 and / or the end cover 3, and a water jacket 7 provided inside the housing 1;

[0040] A first flow channel 8 with a first end communicating with the first water port 5 is formed between the outer periphery of the water jacket 7 and the inner wall of the housing 1. The first flow channel 8 is used to guide the coolant along the axial direction of the housing 1;

[0041] A second flow channel 9 is formed between the end wall of the water jacket 7 and the inner side of the end cover 3. The bearing seat 4 is located in the second flow channel 9, and the first end of the second flow channel 9 communicates with the second end of the first flow channel 8;

[0042] A third flow channel 10 is communicated between the second end of the second flow channel 9 and the second water port 6, and at least a part of the third flow channel 10 is located inside the rotating shaft 2.

[0043] When this motor cooling system is working, the flow path of the coolant is as follows:

[0044] The coolant is introduced from the first water port 5, and then enters the first flow channel 8 formed between the water jacket 7 and the housing 1. The first flow channel 8 guides the coolant along the axial direction of the motor, so that the coolant cools the stator.

[0045] The coolant flows along the first flow channel 8 to its second end and then enters the second flow channel 9. The second flow channel 9 guides the coolant to the third flow channel 10. During this process, the coolant will flow through the bearing seat 4 located in the second flow channel 9 and exchange heat with the bearing seat 4, thereby cooling the bearing seat 4 and the bearing.

[0046] Then, the coolant flows from the second end of the second flow channel 9 into the third flow channel 10 and flows along the third flow channel 10 towards the second water port 6. During this process, the coolant will flow through the inside of the rotating shaft 2 and exchange heat with the rotating shaft 2, thereby cooling the rotating shaft 2.

[0047] Finally, the coolant is discharged from the second water port 6 to complete a single cycle of the coolant.

[0048] In the above flow path of the coolant, the first water port 5 is set as the water inlet, and the second water port 6 is set as the water outlet. However, in practical applications, it is not limited to this. For example, the second water port 6 can also be used as the water inlet, and the first water port 5 can be used as the water outlet, so that the coolant flows in the reverse direction, and the same cooling effect for the rotor, stator and bearing can be achieved.

[0049] According to the motor cooling system of the embodiments of the present invention, by providing a first flow channel 8 flowing along the stator housing 1, a second flow channel 9 passing through the bearing housing 4, and a third flow channel 10 at least partially located within the rotating shaft 2, and connecting the first flow channel 8, the second flow channel 9, and the third flow channel 10 in sequence, the stator cooling water circuit and the rotor cooling water circuit are connected into a circulating flow path, which can achieve the cooling of the motor stator, rotor, and bearings, resulting in better comprehensive cooling effect and higher cooling efficiency of the motor.

[0050] In the embodiments of the present invention, the coolant is water, or those skilled in the art can also select other media as the coolant according to needs, such as cooling oil.

[0051] The motor cooling system provided by the embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0052] According to Figure 1 Exemplarily showing the motor cooling system of at least one embodiment of the present invention, the motor cooling system includes: a first water port 5, a second water port 6, and a cooling flow channel connected between the first water port 5 and the second water port 6.

[0053] In this embodiment, the first water port 5 and the second water port 6 are provided on the motor housing 1 or the end cover 3, serving as the coolant inlet and the coolant outlet of the cooling system. Among them, any one of the first water port 5 and the second water port 6 is the coolant inlet, and the other is the coolant outlet. For example, referring to Figure 1 , in this embodiment, the first water port 5 is the coolant inlet, and the second water port 6 is the coolant outlet.

[0054] Specifically, referring to Figure 1 , in this embodiment, the first water port 5 is provided on the housing 1 and is located on the side of the housing 1 away from the end cover 3, that is, the first water port 5 is located on the Figure 1 left side of the motor shown; the second water port 6 is provided on the end cover 3, that is, the second water port 6 is located on the Figure 1 right side of the motor shown. With such a setting, the coolant enters and exits from the left and right sides of the motor, which can ensure that the coolant flows at least along the entire axial direction of the motor, improving the cooling uniformity of the motor.

[0055] In this embodiment, the cooling flow channel is provided inside the motor and is used to realize the flow of the coolant between the first water port 5 and the second water port 6, so that the coolant provides cooling for the stator of the motor, the motor bearings, the rotor, etc. It specifically includes a first flow channel 8, a second flow channel 9, and a third flow channel 10.

[0056] Among them, the first flow channel 8 is arranged along the housing 1. Specifically, referring to Figure 1 , a water jacket 7 is arranged inside the housing 1, and the first flow channel 8 is formed between the outer periphery of the water jacket 7 and the inner wall of the housing 1. For example, referring toFigure 2 In this embodiment, the water jacket 7 is a cylindrical sleeve structure adapted to the shape profile inside the housing 1. A flow channel groove 81 is provided on the outer side of the water jacket 7. When the water jacket 7 is installed in the housing 1, the flow channel groove 81 on the outer side of the water jacket 7 can enclose a first flow channel 8 with the inner wall of the housing 1.

[0057] Of course, in some other embodiments, the flow channel groove 81 can also be provided on the inner wall of the housing 1, or flow channel grooves 81 are provided on both the inner wall of the housing 1 and the outer side of the water jacket 7. In this way, when the water jacket 7 is installed in the housing 1, a first flow channel 8 can also be formed between the water jacket 7 and the housing 1.

[0058] See Figure 1 The first end, i.e., the left end, of the first flow channel 8 is connected to the first water inlet 5. During use, the first flow channel 8 can guide the coolant introduced from the first water inlet 5 along the axial direction of the housing 1, thereby realizing the cooling of the stator housing 1. For example, see Figure 2 The flow channel groove 81 is spiral along the axial direction of the water jacket 7, so that the first flow channel 8 formed by the water jacket 7 and the housing 1 is also spiral. With this setting, when the coolant flows along the first flow channel 8, it can flow spirally along the circumferential direction of the housing 1, improving the cooling uniformity of the stator.

[0059] Furthermore, in this embodiment, the water jacket 7, the housing 1, and the end cover 3 are integrally provided. For example, the part where the water jacket 7 is connected to the housing 1 is hermetically connected by welding. With this setting, the sealing performance of the first flow channel 8 can be ensured, ensuring that the coolant flows spirally along the first flow channel 8 and fully contacts the housing 1. In addition, it can reduce the number of components, lower the cost, and eliminate the errors caused by the assembly of components.

[0060] In this embodiment, the second flow channel 9 is provided on the end cover 3 and is used to guide the coolant to the bearing seat 4 of the motor to provide heat dissipation and cooling for the motor bearing.

[0061] Specifically, see Figure 1 In this embodiment, the side of the water jacket 7 close to the end cover 3 has an end wall. The second flow channel 9 is formed between the end wall of the water jacket 7 and the inner side of the end cover 3. The bearing seat 4 on the end cover 3 is located in the second flow channel 9. With this setting, after the coolant flows into the second flow channel 9, the second flow channel 9 can guide the coolant to the bearing seat 4, enabling the coolant to exchange heat with the bearing seat 4, thereby realizing the cooling of the motor bearing and the bearing seat 4.

[0062] More specifically, see Figure 1 and Figure 2, on the end wall of the water jacket 7, there is a raised annular sealing rib plate 13. The sealing rib plate 13 is hermetically connected to the inner wall of the end cover 3 by welding or other means, so that there is a gap between the end wall of the water jacket 7 and the inner wall of the end cover 3. This gap forms a chamber between the part of the end wall of the water jacket 7 within the sealing rib plate 13 and the end cover 3, and this chamber is the second flow channel 9.

[0063] See Figure 1 and Figure 2 , on the part of the sealing rib plate 13 opposite to the second end of the first flow channel 8, there is a notch 14. This notch 14 is the inlet of the second flow channel 9. Through this notch 14, the first flow channel 8 can be connected to the second flow channel 9, so that the coolant in the first flow channel 8 can flow into the second flow channel 9. And the side of the second flow channel 9 far from the notch 14 is the outlet of the second flow channel 9. For example, in the Figure 2 shown embodiment, the notch 14 of the sealing rib plate 13 is located on the upper side of the end wall of the water jacket 7. Then the side of the second flow channel 9 far from the notch 14 is the lower side of the second flow channel 9, that is to say, the outlet of the second flow channel 9 is located on the lower side of the second flow channel 9, so that the coolant in the second flow channel 9 can at least flow along the entire radial direction of the end cover 3, making the coolant fully contact with the end cover 3 and the water jacket 7.

[0064] Furthermore, in this embodiment, the bearing seat 4 is located in the second flow channel 9, so that the coolant flowing along the second flow channel 9 can flow through the bearing seat 4 to provide heat dissipation and cooling for the motor bearing.

[0065] For example, see Figure 1 , the bearing seat 4 is formed by the end cover 3 extending inward along the axial direction at the shaft hole. Correspondingly, in the middle of the end wall of the water jacket 7, there is an annular platform 11 extending inward axially. The annular platform 11 just sleeved on the outside of the bearing seat 4, and there is an annular gap between at least part of the annular platform 11 ( Figure 1 the right half of the annular platform 11 shown) and the outside of the bearing seat 4. This annular gap forms an annular flow channel 12 between the bearing seat 4 and the annular platform 11. This annular flow channel 12 is a part of the second flow channel 9, so that the coolant can flow into the annular flow channel 12 and fully contact with the bearing seat 4 for heat exchange to achieve heat dissipation and cooling of the motor bearing. And, the side of the annular platform 11 far from the end cover 3 ( Figure 1 the left half of the annular platform 11 shown) is hermetically arranged with the outside of the bearing seat 4 by welding or other means to seal the left end of the annular flow channel 12 to ensure that the coolant in the annular flow channel 12 will not leak outwards.

[0066] Furthermore, see Figure 2 , on the end wall of the water jacket 7, there are also several flow guiding rib plates 15. For example, Figure 2An exemplary embodiment is shown in which four diversion rib plates 15 are provided on the end wall of the water jacket 7, and each diversion rib plate 15 is located inside the sealing rib plate 13. A diversion channel is formed between every two adjacent diversion rib plates 15 and between the diversion rib plate 15 adjacent to the sealing rib plate 13 and the sealing rib plate 13. Each diversion channel extends from the inlet of the second flow channel 9 to the outlet of the second flow channel 9. That is to say, each diversion channel guides the coolant from the end wall of the water jacket 7 from top to bottom. With this arrangement, each diversion rib plate 15 can divert and guide the coolant flowing into the second flow channel 9, so that the coolant flows more evenly in all directions of the end cover 3, improving the cooling uniformity.

[0067] Furthermore, in this embodiment, the annular flow channel 12 is located in at least one of the diversion channels. For example, referring to Figure 2 , the two middle diversion rib plates 15 surround the outer periphery of the circular hole in the middle of the water jacket 7. When the coolant enters this diversion channel through the notch 14, it can flow through the annular flow channel 12 to exchange heat with the bearing seat 4, ensuring the cooling effect of the bearing.

[0068] In this embodiment, the third flow channel 10 is provided at the end of the motor and at least partially located inside the rotating shaft 2, and is used to guide the coolant to the rotating shaft 2 to provide heat dissipation and cooling for the motor rotor.

[0069] Referring to Figure 1 , in this embodiment, the third flow channel 10 includes a first channel 101, a second channel 102, and a third channel 103. Among them, the first channel 101 and the third channel 103 are both provided at the end of the motor, and the first channel 101 is connected to the second flow channel 9, and the third channel 103 is connected to the second water port 6, so as to realize the inlet and outlet of the third flow channel 10; the second channel 102 is connected between the first channel 101 and the third channel 103 and is located inside the rotating shaft 2, so that the coolant can flow through the inside of the rotating shaft 2.

[0070] Specifically, referring to Figure 1 , a diverter 16 is provided on the outer side of the end cover 3. The first channel 101 and the third channel 103 are both provided in the diverter 16. A first communication hole 17 is provided at a position on the end cover 3 opposite to the first channel 101, and the first communication hole 17 connects the second flow channel 9 and the first channel 101; a second communication hole 18 is provided at a position on the end cover 3 opposite to the third channel 103, and the second communication hole 18 connects the second water port 6 and the third channel 103.

[0071] The second channel 102 is a shaft hole provided inside the rotating shaft 2, and the shaft hole is simultaneously connected to the first channel 101 and the third channel 103. For example, referring to Figure 1, a connection hole 19 is provided in the middle of the diverter 16, and the end of the rotating shaft 2 extends into the connection hole 19 and is rotatably and sealingly arranged with the diverter 16 through a sealing bearing. A communicating pipe 20 is also provided in the rotating shaft hole. One end of the communicating pipe 20 is arranged on the diverter 16 and communicates with the first channel 101 of the diverter 16. The other end of the communicating pipe 20 extends to the side of the rotating shaft hole away from the diverter 16 and communicates with the rotating shaft hole. And the diameter of the communicating pipe 20 is smaller than the diameter of the rotating shaft hole, so that an annular cavity is formed between the inner wall of the communicating pipe 20 and the rotating shaft hole. With such a setting, the coolant in the first channel 101 can be introduced into the deep part of the rotating shaft hole through the communicating pipe 20, and then the coolant flows into the third channel 103 from the annular cavity outside the communicating pipe 20, realizing the circulating flow of the coolant in the rotating shaft hole and improving the cooling effect of the rotating shaft 2.

[0072] According to the motor cooling system provided by the embodiment of the present invention, when in use:

[0073] First, the coolant is introduced from the first water inlet 5, so that the coolant enters the first flow channel 8 and spirally flows to the right along the first flow channel 8 around the water jacket 7, so that the coolant cools the stator housing.

[0074] The coolant flows along the first flow channel 8 to its second end and then enters the second flow channel 9. The coolant flows downward along each shunt channel. During this process, part of the coolant will flow into the annular flow channel 12 to exchange heat with the bearing seat 4, thereby cooling the bearing seat 4 and the bearing.

[0075] The coolant then flows into the third flow channel 10 from the outlet of the second flow channel 9. After entering the third flow channel 10, the coolant first flows along the first channel 101, and then is introduced into the rotating shaft hole through the communicating pipe 20 to exchange heat with the rotating shaft 2. Then the coolant flows into the third channel 103 from the annular cavity outside the communicating pipe 20.

[0076] Finally, the coolant flows into the second communication hole 18 from the third channel 103 and is discharged from the second water outlet 6, completing a single cycle of the coolant.

[0077] On the other hand, the embodiment of the present invention also provides a motor, which includes the motor cooling system of any of the above embodiments.

[0078] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered to be within the scope described in this specification.

[0079] The above embodiments only illustrate several implementation manners of the present application. The description thereof is relatively specific and detailed, but it should not be construed as a limitation to the scope of the utility model patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all fall within the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

Claims

1. A motor cooling system, for a motor, the motor comprising a housing (1), a rotating shaft (2) and an end cover (3), characterized in that: The end cover (3) is arranged at one end of the housing (1), and a shaft hole for the rotating shaft (2) to pass through is arranged in the middle of the end cover (3), and a bearing seat (4) for mounting a bearing is formed at the shaft hole of the end cover (3); The motor cooling system comprises a first water inlet (5) and a second water inlet (6) arranged on the casing (1) and / or the end cover (3), and a water jacket (7) arranged in the casing (1); A first flow channel (8) is formed between the outer periphery of the water jacket (7) and the inner wall of the casing (1), the first end of the first flow channel being connected to the first water inlet (5), and the first flow channel (8) is used to guide the cooling liquid along the axial direction of the casing (1); A second flow channel (9) is formed between the end wall of the water jacket (7) and the inner side of the end cover (3), the bearing seat (4) is located in the second flow channel (9), and the first end of the second flow channel (9) is connected to the second end of the first flow channel (8); A third flow channel (10) is connected between the second end of the second flow channel (9) and the second water outlet (6), and the third flow channel (10) is at least partially located inside the rotating shaft (2).

2. The motor cooling system according to claim 1, characterized in that: The bearing seat (4) extends axially inwardly along the shaft hole; An annular platform (11) extending axially inward is provided on the end wall of the water jacket (7); the annular platform (11) is sleeved on the bearing seat (4); and an annular gap is provided between at least part of the annular platform (11) and the outer side of the bearing seat (4) to form an annular flow channel (12) between the bearing seat (4) and the annular platform (11); the annular flow channel (12) is a part of the second flow channel (9); and a side of the annular platform (11) away from the end cover (3) is sealed with the outer side of the bearing seat (4).

3. The motor cooling system according to claim 2, characterized in that: An annular sealing rib (13) is protruded from the end wall of the water jacket (7), and the sealing rib (13) is sealed with the inner wall of the end cover (3), so that the part of the end wall of the water jacket (7) located inside the sealing rib (13) and the inner wall of the end cover (3) form the second flow channel (9); A notch (14) is provided at a position of the sealing rib (13) opposite to the second end of the first flow channel (8), and the first flow channel (8) is connected to the second flow channel (9) through the notch (14), and the third flow channel (10) is connected to a side of the second flow channel (9) away from the notch (14).

4. The motor cooling system according to claim 3, characterized in that: A plurality of guide ribs (15) are also provided on the end wall of the water jacket (7), and a branch channel extending from the notch (14) to the connection point between the second flow channel (9) and the third flow channel (10) is formed between each two adjacent guide ribs (15).

5. The motor cooling system according to claim 4, characterized in that: The annular flow channel (12) is located in at least one of the branch flow channels.

6. The motor cooling system according to claim 1, characterized in that: The third flow channel (10) comprises a first channel (101), a second channel (102) and a third channel (103); The first channel (101) and the third channel (103) are both arranged at the end of the motor, and the first channel (101) is connected to the second flow channel (9), and the third channel (103) is connected to the second water outlet (6); The second channel (102) comprises a shaft hole formed in the shaft (2), the shaft hole being in communication with an end of the first channel (101) away from the second flow channel (9) and an end of the third channel (103) away from the second water outlet (6).

7. The motor cooling system according to claim 6, characterized in that: A flow divider (16) is arranged on the outside of the end cover (3), the first channel (101) and the third channel (103) are both arranged in the flow divider (16), and the end cover (3) is provided with a first connecting hole (17) connecting the first channel (101) and the second flow channel (9), and a second connecting hole (18) connecting the third channel (103) and the second water outlet (6); A connecting hole (19) is provided in the middle of the flow divider (16), and the end of the rotating shaft (2) is rotatably sealed and arranged in the connecting hole (19). The rotating shaft hole and the third channel (103) are both connected to the connecting hole (19). A connecting pipe (20) is also provided in the rotating shaft hole, and one end of the connecting pipe (20) is connected to the first channel (101), and the other end extends into the side of the rotating shaft hole away from the first channel (101) and is connected to the rotating shaft hole.

8. The motor cooling system according to claim 1, characterized in that: The first flow channel (8) is spiral along the axial direction of the motor.

9. The motor cooling system according to claim 1, characterized in that: The water jacket (7), the end cover (3) and the casing (1) are fixedly integrated into one body.

10. A motor, characterized in that: A motor cooling system comprising any one of claims 1-9.

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