Motor cooling system, motor and vehicle

Abstract

The utility model relates to a motor cooling system, a motor and a vehicle. The motor cooling system comprises a shell assembly, a stator assembly and a first sealing piece. The shell assembly comprises a containing cavity with a first liquid inlet. The stator assembly comprises a stator core and a stator winding, the stator core comprises a stator slot, the stator winding is arranged in the stator slot, and a cooling channel for cooling liquid to flow is formed between the stator slot and the stator winding; the first sealing element is used for at least sealing a first opening, facing the stator assembly, of the stator groove, and a liquid storage cavity is defined by the first sealing element and the side wall of the containing cavity and communicates with the cooling channel and the first liquid inlet. According to the motor cooling system, the stator core and the stator winding can be directly cooled, the power density and the torque density of the motor are effectively improved, stator cooling maximization can be achieved without additional parts (such as oil rings / oil pipes), and the structure of the cooling system is greatly simplified.

Description

Technical Field

[0001] The present disclosure relates to the technical field of motor cooling, and in particular, to a motor cooling system, a motor and a vehicle. Background Art

[0002] The drive motors of new energy vehicles are mostly permanent magnet synchronous motors. When the motors run in the high-speed zone, the heat generated by the motor rotor components increases sharply. If the drive motors cannot be effectively dissipated and cooled, the overall performance of the motors will be directly affected, resulting in low reliability, stability and efficiency of the motors, which will seriously affect the reliable and stable operation of the vehicle.

[0003] In the related art, cooling is performed by additionally providing oil pipes or oil rings inside the motor, which has a complex structure and a limited cooling effect. Utility Model Content

[0004] The purpose of the present disclosure is to provide a motor cooling system, a motor and a vehicle, wherein the motor cooling system can directly cool the stator core and the stator winding, thereby effectively improving the power density and torque density of the motor, and maximizing the stator cooling without the need for additional parts (such as oil rings / oil pipes), thereby greatly simplifying the cooling system structure.

[0005] In order to achieve the above object, the present disclosure provides a motor cooling system in a first aspect, comprising:

[0006] A housing assembly includes a receiving cavity having a first liquid inlet;

[0007] A stator assembly, comprising a stator core and a stator winding, wherein the stator core comprises stator slots, the stator winding is arranged in the stator slots, and a cooling channel for cooling liquid to flow is formed between the stator slots and the stator winding; and

[0008] The first sealing member is used for sealing at least a first opening of the stator slot toward the stator assembly and enclosing a liquid storage cavity with the side wall of the accommodating cavity. The liquid storage cavity is respectively connected with the cooling channel and the first liquid inlet.

[0009] Optionally, the cooling channel axially penetrates opposite sides of the stator assembly.

[0010] Optionally, a groove portion facing away from the side wall of the stator slot is formed on the stator winding, and the cooling channel is formed between the groove portion and the side wall of the stator slot; and / or

[0011] The stator slot side wall is formed with a groove portion facing the stator winding from behind, and the cooling channel is formed between the groove portion and the stator winding.

[0012] Optionally, the stator winding includes a plurality of copper wires arranged in each of the stator slots, and at least one cooling channel is arranged between each of the copper wires and the stator slot.

[0013] Optionally, the first seal and the stator core are integrally injection molded.

[0014] Optionally, the first sealing member includes a first sealing portion for sealing the first opening, and the first sealing portion corresponds to the first opening one by one;

[0015] The first sealing member further comprises at least one second sealing portion disposed at one end of the first sealing portion, and the second sealing portion is used to enclose the liquid storage cavity together with the side wall of the accommodating cavity.

[0016] Optionally, the second sealing portion is provided with a second liquid inlet communicating with the second opening of the stator slot.

[0017] Optionally, the housing assembly comprises a housing and an end cover, and the first liquid inlet is provided on the housing;

[0018] The end cover includes an extension portion facing the interior of the accommodating cavity, and the first sealing member, the extension portion and the shell form the liquid storage cavity.

[0019] Optionally, a sealing structure is provided at the junction of the first sealing member and the extension portion.

[0020] Optionally, a sealing groove is formed on the side of the extension portion facing the first sealing member, a second sealing member is installed in the sealing groove, and the second sealing member is used to seal between the extension portion and the first sealing member.

[0021] Optionally, an insulating layer is provided at a position of the end cover corresponding to the stator winding.

[0022] According to a second aspect of the present disclosure, a motor is provided, comprising a rotor assembly and the above-mentioned motor cooling system.

[0023] According to a third aspect of the present disclosure, a vehicle is provided, comprising the above-mentioned motor.

[0024] Through the above technical solution, that is, the motor cooling system disclosed in the present invention, the stator assembly and the first seal are arranged in the accommodating cavity of the shell assembly, and a cooling channel is formed between the stator slots of the stator core and the stator windings. The first seal seals the first opening of the stator slots and forms a liquid storage cavity with the side wall of the accommodating cavity. The coolant (such as cooling oil) enters the liquid storage cavity from the first liquid inlet of the shell assembly, and enters the cooling channel to cool the stator core and the stator windings. The motor cooling system disclosed in the present invention can directly cool the stator core and the stator windings by forming a cooling channel between the stator slots of the stator core and the stator windings, and using the first seal for sealing. The power density and torque density of the motor are effectively improved, and the stator cooling can be maximized without the need for additional parts (such as oil rings / oil pipes), and the cooling system structure is greatly simplified.

[0025] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0027] Figure 1 It is a schematic diagram of the structure of the motor provided in some embodiments of the present disclosure.

[0028] Figure 2 is a cross-sectional view of a stator assembly of a motor cooling system provided by some embodiments of the present disclosure.

[0029] Figure 3 It is a schematic diagram of the coordination between the stator winding and the first seal provided in some embodiments of the present disclosure.

[0030] Figure 4 is a structural diagram of a first seal provided in some embodiments of the present disclosure.

[0031] Figure 5 It is a partially enlarged view of the liquid storage chamber provided in some embodiments of the present disclosure.

[0032] Description of Reference Numerals

[0033] 100-housing assembly; 101-accommodating chamber; 102-liquid storage chamber; 110-housing; 111-first liquid inlet; 120-end cover; 121-extension portion; 1211-sealing groove; 122-insulating layer;

[0034] 200-stator assembly; 201-cooling channel; 210-stator core; 211-stator slot; 2111-first opening; 2112-second opening; 220-stator winding; 221-copper wire; 2211-groove portion;

[0035] 300 - first sealing member; 310 - first sealing portion; 320 - second sealing portion; 321 - second liquid inlet; 330 - third sealing portion;

[0036] 400 - second sealing member;

[0037] 500-Rotor assembly. DETAILED DESCRIPTION

[0038] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0039] In the present disclosure, unless otherwise specified, directional words such as "up, down, left, right" generally refer to up, down, left, right relative to the accompanying drawings; "inside and outside" refer to the inside and outside of the outline of the corresponding component; "far and near" refer to the corresponding structure or the corresponding component being far away from or close to another structure or component. In addition, the terms "first", "second", etc. used in the present disclosure are to distinguish one element from another and do not have order and importance. In addition, in the following description, when referring to the drawings, unless otherwise explained, the same figure numbers in different drawings represent the same or similar elements. The above definitions are only used to explain and illustrate the present disclosure and should not be construed as limitations on the present disclosure.

[0040] The drive motors of new energy vehicles are mostly permanent magnet synchronous motors. When the motors are running in the high-speed zone, the heat generated by the motor rotor components increases sharply. In severe cases, this may cause the magnetic steel to demagnetize and the power to decay / lose power. Therefore, if the drive motor cannot be effectively cooled and cooled, it will directly affect the overall performance of the motor, resulting in low reliability, stability and efficiency of the motor operation, which seriously affects the reliable and stable operation of the vehicle. In related technologies, most of them use additional oil pipes or oil rings inside the motor for cooling, which has a complex structure and limited cooling effect.

[0041] The purpose of the present disclosure is to provide a motor cooling system, a motor and a vehicle, wherein the motor cooling system can directly cool the stator core 210 and the stator winding 220, thereby effectively improving the power density and torque density of the motor, and maximizing the stator cooling without the need for additional parts (such as oil rings / oil pipes), thereby greatly simplifying the cooling system structure.

[0042] In order to achieve the above purpose, Figures 1 to 5As shown, an embodiment of the present disclosure provides a motor cooling system, including a housing assembly 100, a stator assembly 200 and a first sealing member 300. The housing assembly 100 includes a housing cavity 101 having a first liquid inlet 111. The stator assembly 200 includes a stator core 210 and a stator winding 220. The stator core 210 includes a stator slot 211. The stator winding 220 is disposed in the stator slot 211. A cooling channel 201 for the circulation of coolant is formed between the stator slot 211 and the stator winding 220. The first sealing member 300 is used to seal at least the first opening 2111 of the stator slot 211 toward the stator assembly 200, and to enclose a liquid storage cavity 102 with the side wall of the housing cavity 101. The liquid storage cavity 102 is respectively connected to the cooling channel 201 and the first liquid inlet 111.

[0043] Through the above technical solution, that is, the motor cooling system disclosed in the present invention, the stator assembly 200 and the first seal 300 are arranged in the accommodating cavity 101 of the shell assembly, and a cooling channel 201 is formed between the stator slot 211 of the stator core 210 and the stator winding 220. The first seal 300 seals the first opening 2111 of the stator slot 211 and forms a liquid storage cavity 102 with the side wall of the accommodating cavity 101. The coolant (such as cooling oil) enters the liquid storage cavity 102 from the first liquid inlet 111 of the shell assembly 100, and enters the cooling channel 201 to cool the stator core 210 and the stator winding 220. The motor cooling system disclosed in the present invention forms a cooling channel 201 between the stator slots 211 of the stator core 210 and the stator winding 220, and uses a first seal 300 for sealing, so that the stator core 210 and the stator winding 220 can be directly cooled. The power density and torque density of the motor are effectively improved, and no additional parts (such as oil rings / oil pipes) are required to maximize stator cooling, and the cooling system structure is greatly simplified.

[0044] There are multiple stator slots 211 arranged on the inner wall of the stator core 210, and each stator slot 211 includes a first opening 2111 and two second openings arranged on opposite axial sides of the stator slot 211, wherein the first opening 2111 is an opening facing the rotor assembly 500, and the second openings are openings on the two axial end surfaces of the stator core 210.

[0045] The first seal 300 is configured to seal the first opening 2111 of the stator slot 211, and the first seal 300 can extend at least one side end surface of the stator core 210, and enclose a liquid storage chamber 102 connected to the first liquid inlet 111 together with the accommodating chamber 101 of the housing assembly 100, and the liquid storage chamber 102 is also connected to the above-mentioned cooling channel 201, so that the coolant (such as cooling oil) can directly enter the cooling channel 201 to cool the stator core 210 and the stator winding 220 of the stator assembly 200.

[0046] In some embodiments, the cooling channel 201 axially penetrates opposite sides of the stator assembly 200. That is, the liquid storage chamber 102 is located at one axial end of the stator core 210. Since the cooling channel penetrates opposite sides of the stator assembly 200, the coolant enters from the first liquid inlet 111 of the housing assembly 100 and enters the closed liquid storage chamber 102 to cool the stator core 210 and one axial end of the stator winding 220. The coolant passes through the cooling channel 201 formed by the stator winding 220 and the stator slot 211 of the stator core 210 in the liquid storage chamber 102 to cool the stator winding 220 and the stator core 210 in the slot, and finally sprays out through the other end of the cooling channel 201 to cool the stator winding 220 at the other end.

[0047] It should be noted that the housing assembly 100 is also provided with a liquid return port for recovering the coolant, so that the coolant can flow out of the housing assembly 100 and can be recycled after heat exchange through external equipment.

[0048] The cooling channel 201 is constructed in any suitable manner, such as Figure 2 and Figure 5 As shown, in some embodiments of the present disclosure, a groove portion 2211 facing away from the side wall of the stator slot 211 is formed on the stator winding 220, and a cooling channel 201 is formed between the groove portion 2211 and the side wall of the stator slot 211. Wherein, a groove portion 2211 is formed on the stator winding 220, and a cooling channel 201 is formed between the groove portion 2211 and the side wall of the stator slot 211. There can be multiple groove portions 2211, and each groove portion 2211 forms a cooling channel 201. Therefore, multiple cooling channels 201 can increase the contact area between the coolant and the stator core 210 and the stator winding 220, thereby improving the cooling effect.

[0049] In other embodiments, the side wall of the stator slot 211 is formed with a groove portion 2211 facing the stator winding 220, and a cooling channel 201 is formed between the groove portion 2211 and the stator winding 220. Similarly, the groove portion 2211 can be formed on the side wall of the stator slot 211, and the cooling channel 201 can be surrounded by the groove portion 2211 and the stator winding 220. Similarly, there can be multiple groove portions 2211, and multiple cooling channels 201 with better cooling capacity can be formed.

[0050] In some other embodiments, a groove portion 2211 facing away from the side wall of the stator slot 211 may be formed on the stator winding 220, and a groove portion 2211 facing away from the stator winding 220 may be formed on the side wall of the stator slot 211. Similarly, multiple cooling channels 201 may be formed for the coolant to pass through.

[0051] like Figure 2As shown, in some embodiments, the stator winding 220 may include a plurality of copper wires 221 disposed in each stator slot 211, and at least one cooling channel 201 is provided between each copper wire 221 and the stator slot 211. The copper wire 221 may have a rectangular or approximately rectangular cross-section, and a groove portion 2211 may be formed on two opposite side walls of each copper wire 221 corresponding to the winding assembly, and the groove portion 2211 and the side wall of the stator slot 211 are used to enclose the cooling channel 201. For example, eight layers of copper wires 221 are arranged along the slot depth in each stator slot 211, and the groove portions 2211 are arranged on two opposite side surfaces of two adjacent copper wires 221. Of course, they may also be arranged on both side surfaces at the same time, or those skilled in the art may arrange the groove portions 2211 according to actual needs.

[0052] It should be noted that a groove portion 2211 may be provided on at least one side of two adjacent copper wires 221 facing the other copper wire 221, and a cooling channel 201 for the circulation of coolant may be formed. By cooling the copper wires 221 of the stator winding, the stator core 210 may also be indirectly cooled.

[0053] In some embodiments, the first seal 300 is integrally injection molded with the stator core 210, that is, the stator core 210 is first processed into the stator core 210, and then integrally injection molded based on the stator core 210, so as to achieve the sealing of the cooling channel 201 in the stator slot 211. At the same time, the first seal 300 can also cooperate with the shell assembly 100 (including the end cover 120 and the shell 110) to form a liquid storage chamber 102 located at one end of the stator assembly 200.

[0054] The material of the first sealing member 300 is preferably a high-strength, high-fluidity thermoplastic material, including but not limited to PPS (polyphenylene sulfide, a new type of high-performance thermoplastic resin with the advantages of high mechanical strength, high temperature resistance, chemical resistance, flame retardancy, good thermal stability, and excellent electrical properties.).

[0055] In order to seal the first opening 2111 of the stator slot 211 and form a liquid storage tank, as shown in FIG. Figure 3 , Figure 4 and Figure 5 As shown, in some embodiments, the first sealing member 300 includes a first sealing portion 310 for sealing the first opening 2111, and the first sealing portion 310 corresponds one-to-one to the first opening 2111; the first sealing member 300 also includes at least one second sealing portion 320 arranged at one end of the first sealing portion 310, and the second sealing portion 320 is used to enclose the liquid storage chamber 102 with the side wall of the accommodating chamber 101.

[0056] Among them, there can be multiple first sealing parts 310, and the two second sealing parts 320 can be respectively connected to the opposite ends of the multiple second sealing parts 320 to form an annular structure as a whole. The multiple first sealing parts 310 correspond one by one to the first openings 2111 of the multiple stator slots 211 and are sealed to the first openings 2111. The second sealing parts 320 are sealed and fit the end face of the stator core 210, and extend radially from the first sealing parts 310 toward the outer end of the stator core 210. The stator core 210 and the inner side wall of the shell 110 adopt interference fit or spline fit to achieve fixed connection.

[0057] It should be noted that the second sealing portion 320 is provided with a second liquid inlet 321 connected to the second opening of the stator slot 211, so that the coolant in the liquid storage chamber 102 can enter the cooling channel 201 from the second liquid inlet 321 (one end of the cooling channel 201) facing the liquid storage chamber 102, and be discharged from the second liquid inlet 321 on the other side (the other end of the cooling channel 201).

[0058] The housing assembly 100 may be constructed in any suitable manner, such as Figure 1 As shown, in some embodiments of the present disclosure, the housing assembly 100 may include a housing 110 and an end cover 120, the first liquid inlet 111 is provided in the housing 110; the end cover 120 includes an extension portion 121 facing the inside of the accommodating cavity 101, and the first seal 300, the extension portion 121 and the housing 110 surround the liquid storage cavity 102. The end cover 120 is detachably and sealedly installed at the left opening of the housing 110, and the two form the accommodating cavity 101. The inner wall of the end cover 120 is formed with an extension portion 121 (specifically, it can be an annular structure) facing the stator core 210, and the extension portion 121 can be sealed and connected with the second sealing portion 320 of the first seal 300, so as to form a liquid storage cavity 102 between the end cover 120, the first seal 300 and the housing 110, and the liquid storage cavity 102 is respectively connected with the first liquid inlet 111 and the second liquid inlet 321 (located on the left side of the cooling channel 201).

[0059] It should be noted that in order to achieve better connection and sealing, in some embodiments, the first seal 300 also includes a second seal 320 and a third seal 330 extending away from the first seal 310 and toward the end cover 120, and the extension portion 121 of the end cover 120 is sealed and connected to the third seal 330, and then combined with the second seal 400, the end cover 120 and the housing 110 to form an oil storage chamber.

[0060] In order to better achieve the sealing effect between the first sealing member 300 and the extension portion 121, in some embodiments, a sealing structure is provided at the junction of the first sealing member 300 and the extension portion 121. When the first sealing member 300 includes the third sealing portion 330, the third sealing portion 330 and the extension portion 121 may be in an overlapping relationship, and the sealing structure may be provided between the extension portion 121 and the third sealing portion 330 for a sealed connection therebetween.

[0061] like Figure 5 As shown, in some embodiments, a sealing groove 1211 is formed on the side of the extension portion 121 facing the first sealing member 300 , and a second sealing member 400 is installed in the sealing groove 1211 . The second sealing member 400 is used to seal between the extension portion 121 and the first sealing member 300 .

[0062] When the first sealing member 300 includes the first sealing portion 310, the second sealing portion 320 and the third sealing portion 330, the third sealing portion 330 is sleeved on the circumferential outer side of the extension portion 121, and the extension portion 121 is formed with a sealing groove 1211, and the second sealing member 400 is installed in the sealing groove 1211, so as to seal the extension portion 121 and the third sealing portion 330. It should be noted that the second sealing member 400 may be, for example, a sealing ring or a sealing strip.

[0063] In some embodiments, when the distance between the stator winding 220 and the end housing is small, in order to improve the insulation between the two, such as Figure 5 As shown, in some embodiments, the end cap 120 is provided with an insulating layer 122 at a position corresponding to the stator winding 220. Insulation spraying can be performed on the surface of the extension portion 121 facing the stator winding 220 and the surface of the end cap 120 facing the stator winding 220 to form the insulating layer 122. It should be noted that the surface of the end cap 120 can be subjected to insulation spraying according to the design to ensure electrical clearance, such as epoxy spraying, plastic injection molding, ceramic spraying, etc.

[0064] An embodiment of the present disclosure provides a motor, which includes a rotor assembly 500 and the motor cooling system described above.

[0065] An embodiment of the present disclosure also provides a vehicle, which includes the above-mentioned motor. Therefore, the vehicle also has all the advantages of the above-mentioned motor, which will not be repeated here.

[0066] Embodiments of the present disclosure provide a motor cooling system, a motor, and a vehicle. First, a first seal 300 is formed by integrally injection molding in a stator slot 211 of a stator core 210 and on an end surface of the stator core 210, so that a cooling channel 201 is formed in the stator slot 211 to cool the stator core 210 and the stator winding 220, thereby preventing cooling oil from entering an air gap between the stator assembly 200 and the rotor assembly 500.

[0067] Secondly, the first seal 300, the end cover 120, and the shell 110 form a liquid storage chamber 102 located at the end of the stator core 210, which can cool the stator winding 220 and the stator core 210, and can also be connected to the cooling channel 201 to provide cooling liquid to further cool the stator winding 220 and the stator core 210.

[0068] Furthermore, the end cap 120 is subjected to insulation spraying to form an insulation layer 122 to improve the insulation performance.

[0069] Finally, the copper wire 221 of the stator winding 220 is processed with the groove portion 2211, and together with the stator slot 211, a cooling channel 201 in the stator slot 211 is formed. The coolant (cooling oil) enters from the first liquid inlet 111 of the housing 110 and enters the liquid storage chamber 102 to cool the end of the stator winding 220 and the stator core 210; the coolant in the liquid storage chamber 102 cools the stator winding 220 and the stator core 210 in the slot through the cooling channel 201 formed by the groove portion 2211 of the winding copper wire 221 and the stator slot 211; finally, it is axially ejected through the other end to cool the stator winding 220 on the other side. The present invention uses the cooling channel 201 formed in the liquid storage cavity 102 and the stator slot 211 to directly cool the stator core 210 and the stator winding 220. No additional parts are required, so the cooling of the stator assembly 200 can be maximized, the structure is simplified, and the power density and torque density of the motor can be effectively improved.

[0070] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0071] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0072] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A motor cooling system, characterized in that: include: A housing assembly includes a receiving cavity having a first liquid inlet; A stator assembly, comprising a stator core and a stator winding, wherein the stator core comprises stator slots, the stator winding is arranged in the stator slots, and a cooling channel for cooling liquid to flow is formed between the stator slots and the stator winding; as well as The first sealing member is used for sealing at least a first opening of the stator slot toward the stator assembly and enclosing a liquid storage cavity with the side wall of the accommodating cavity. The liquid storage cavity is respectively connected with the cooling channel and the first liquid inlet.

2. The motor cooling system according to claim 1, characterized in that: The cooling channel axially penetrates opposite sides of the stator assembly.

3. The motor cooling system according to claim 2, characterized in that: The stator winding is formed with a groove portion facing away from the side wall of the stator slot, and the cooling channel is formed between the groove portion and the side wall of the stator slot; and / or The stator slot side wall is formed with a groove portion facing the stator winding from behind, and the cooling channel is formed between the groove portion and the stator winding.

4. The motor cooling system according to claim 3, characterized in that: The stator winding includes a plurality of copper wires arranged in each of the stator slots, and at least one cooling channel is arranged between each of the copper wires and the stator slot.

5. The motor cooling system according to claim 1, characterized in that: The first sealing member and the stator core are integrally injection molded.

6. The motor cooling system according to claim 1, characterized in that: The first sealing member comprises a first sealing portion for sealing the first opening, the first sealing portion corresponding to the first opening one by one; The first sealing member further comprises at least one second sealing portion disposed at one end of the first sealing portion, and the second sealing portion is used to enclose the liquid storage cavity together with the side wall of the accommodating cavity.

7. The motor cooling system according to claim 6, characterized in that: The second sealing portion is provided with a second liquid inlet communicating with the second opening of the stator slot.

8. The motor cooling system according to any one of claims 1 to 7, characterized in that: The housing assembly comprises a housing and an end cover, and the first liquid inlet is arranged on the housing; The end cover includes an extension portion facing the interior of the accommodating cavity, and the first sealing member, the extension portion and the shell form the liquid storage cavity.

9. The motor cooling system according to claim 8, characterized in that: A sealing structure is provided at the junction of the first sealing member and the extending portion.

10. The motor cooling system according to claim 9, characterized in that: A sealing groove is formed on the side of the extension portion facing the first sealing member, a second sealing member is installed in the sealing groove, and the second sealing member is used to seal between the extension portion and the first sealing member.

11. The motor cooling system according to claim 8, characterized in that: The end cover is provided with an insulating layer at a position corresponding to the stator winding.

12. A motor, characterized in that: The invention comprises a rotor assembly and a motor cooling system as claimed in any one of claims 1 to 11.

13. A vehicle, characterized in that: Including the motor as claimed in claim 12.

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