Stator winding cooling structure, motor, electric drive assembly and vehicle

Abstract

The utility model relates to a stator winding cooling structure, a motor, an electric drive assembly and a vehicle, the stator winding cooling structure comprises a cover body, the cover body is used for being arranged at at least one end of a stator iron core and defining a cooling cavity together with the stator iron core, and the cooling cavity is used for accommodating a stator winding end located at the end of the stator iron core. A first inlet and a first outlet which are communicated with the cooling cavity are formed in the cover body, the first inlet is used for allowing a cooling medium to flow into the cooling cavity, and the first outlet is used for allowing the cooling medium in the cooling cavity to flow out of the cooling cavity. The stator winding cooling structure disclosed by the utility model not only can realize heat dissipation and cooling of the stator winding, but also can prevent the cooling medium from existing between the stator and the rotor, so that on one hand, the rotation friction resistance of the rotor can be reduced, and the efficiency of the motor can be improved; and on the other hand, the sealing grade of other parts of the motor can be set to be lower.

Description

Technical Field

[0001] The present disclosure relates to the technical field of electric machines, and more particularly, to a stator winding cooling structure, an electric machine, an electric drive assembly, and a vehicle. Background Art

[0002] During the operation of an electric machine, a large amount of heat is generated. To ensure the normal operation of the electric machine, it is necessary to cool the electric machine.

[0003] In the related art, the stator winding is usually cooled by the rotor flinging oil. However, this cooling method has the following problems:

[0004] 1. The rotor needs to do additional work to fling the cooling oil to the stator winding, and the cooling oil will exist between the stator and the rotor, thereby increasing the frictional resistance of the rotor rotation and affecting the efficiency of the electric machine;

[0005] 2. To prevent the cooling oil from flowing to other components of the electric machine and affecting them, other components of the electric machine need to have a high sealing level;

[0006] 3. Since the lower the rotational speed of the rotor, the lower the height of the flung oil, that is, the amount and speed of the cooling oil flung to the stator winding by the rotor are affected by the rotational speed of the rotor. Therefore, the stability of cooling the stator winding by this method is poor. Summary of the Utility Model

[0007] The purpose of the present disclosure is to provide a stator winding cooling structure, an electric machine, an electric drive assembly, and a vehicle to at least partially solve the technical problems existing in the related art.

[0008] To achieve the above object, according to the first aspect of the present disclosure, a stator winding cooling structure is provided, including a cover body, the cover body is configured to be disposed at at least one end of a stator core and jointly define a cooling cavity with the stator core, and the cooling cavity is used to accommodate the stator winding ends located at the ends of the stator core;

[0009] A first inlet and a first outlet, both of which are in communication with the cooling cavity, are formed on the cover body. The first inlet is used for the cooling medium to flow into the cooling cavity, and the first outlet is used for the cooling medium in the cooling cavity to flow out of the cooling cavity.

[0010] Optionally, the first outlet is located at the upper part of the cover body, so that the cooling medium in the cooling cavity can flow out of the cooling cavity after submerging the stator winding ends.

[0011] Optionally, the first inlet is located at the lower part of the cover body.

[0012] Optionally, the stator winding cooling structure further includes a seal, which is used to seal the gap between one end of the cover close to the stator core and the end face of the stator core.

[0013] Optionally, a protrusion is formed on one side of the seal close to the cover, and a groove matching the protrusion is formed on one side of the cover close to the seal; or,

[0014] A groove is formed on one side of the seal close to the cover, and a protrusion matching the groove is formed on one side of the cover close to the seal.

[0015] Optionally, the stator winding cooling structure further includes a first adhesive layer and a second adhesive layer. One side of the seal close to the cover is adhesively sealed to the cover through the first adhesive layer, and one side of the seal facing away from the cover is used to be adhesively sealed to the end face of the stator core through the second adhesive layer.

[0016] Optionally, the cover is formed as an annular shape and includes an outer ring portion, an inner ring portion, and a connecting portion connecting between the outer ring portion and the inner ring portion. The outer ring portion, the connecting portion, and the inner ring portion are used to jointly enclose the annular cooling cavity with the end face of the stator core.

[0017] Optionally, the stator winding cooling structure further includes a seal, which includes an outer seal ring and an inner seal ring. The outer seal ring is arranged at one end of the outer ring portion close to the stator core, and the inner seal ring is arranged at one end of the inner ring portion close to the stator core.

[0018] Optionally, the cover includes a first cover and a second cover, and the first cover and the second cover are used to be respectively arranged at both ends of the stator core;

[0019] Both the first cover and the second cover are installed on the motor housing.

[0020] Optionally, a plurality of first positioning protrusions are arranged at one end of the first cover away from the second cover, and the plurality of first positioning protrusions are used to be respectively inserted into a plurality of first positioning grooves on the inner wall of the motor housing; and / or,

[0021] A plurality of second positioning protrusions are arranged at one end of the second cover away from the first cover, and the plurality of second positioning protrusions are used to be respectively inserted into a plurality of second positioning grooves on the inner wall of the motor housing.

[0022] Optionally, the plurality of first positioning protrusions are arranged at unequal intervals along the circumferential direction of the first cover; and / or,

[0023] The plurality of second positioning protrusions are arranged at unequal intervals along the circumferential direction of the second cover.

[0024] The plurality of first positioning protrusions are asymmetric with respect to any radial line passing through the center of the first housing along the radial direction of the first housing; and / or,

[0025] The plurality of second positioning protrusions are asymmetric with respect to any radial line passing through the center of the second housing along the radial direction of the second housing.

[0026] Optionally, the first housing is configured to be connected to the motor housing through a fastener to press the second housing against the inner wall of the motor housing.

[0027] Optionally, a plurality of mounting lugs protruding radially from the first housing are provided on the first housing, and each mounting lug is formed with a mounting hole for the fastener to pass through.

[0028] Optionally, the diameter of the first inlet is 5 mm to 7 mm; and / or,

[0029] The diameter of the first outlet is 5 mm to 7 mm.

[0030] According to a second aspect of the present disclosure, a motor is provided, including a stator core, a stator winding, and the above-mentioned stator winding cooling structure;

[0031] The stator winding has a stator winding end at an end of the stator core, the housing is disposed at at least one end of the stator core and jointly defines a cooling cavity with the stator core, and the stator winding end is received in the cooling cavity.

[0032] Optionally, the housing includes a first housing and a second housing, and the first housing and the second housing respectively cover the stator winding ends located at both ends of the stator core;

[0033] The motor further includes a motor housing, the motor housing includes a first half-shell and a second half-shell, the first housing is disposed close to the second half-shell, the second housing is disposed close to the first half-shell, the first housing is connected to the first half-shell through a fastener so that the second housing can be pressed against the inner wall of the first half-shell, and an abutting protrusion is further provided on the inner wall of the second half-shell, and the abutting protrusion abuts against a side of the first housing facing away from the second housing.

[0034] Optionally, the abutting protrusion is an elastic protrusion.

[0035] Optionally, a plurality of ribs extending along the axial direction of the stator core are formed on the outer peripheral surface of the stator core, and each rib is formed with a through hole;

[0036] The cover body includes a first cover body and a second cover body. The first cover body and the second cover body are respectively arranged at two ends of the stator core. A plurality of mounting lugs protruding radially from the first cover body are provided on the first cover body, and mounting holes are formed on each of the mounting lugs;

[0037] The motor further includes a motor housing. Fasteners pass through the mounting holes and the through holes to be connected to the motor housing.

[0038] Optionally, the motor further includes a rotor and a rotor cooling structure;

[0039] A cooling channel extending along the axial direction of the rotor is formed in the rotor. The rotor cooling structure is installed in the cooling channel. A second inlet and a second outlet are provided on the rotor cooling structure. The second inlet is used for cooling medium to enter the cooling channel, and the second outlet is used for the cooling medium to flow out of the cooling channel.

[0040] Optionally, the rotor cooling structure includes a mounting portion and a conveying portion. The mounting portion is used for connecting with the channel wall of the cooling channel, and both the second inlet and the second outlet are formed on the mounting portion;

[0041] The conveying portion extends along the axial direction of the rotor. A conveying channel for the cooling medium to flow through is formed in the conveying portion. One end of the conveying channel is communicated with the second inlet, and the other end of the conveying channel is communicated with the cooling channel.

[0042] Optionally, the central axis of the conveying portion and the central axis of the second inlet are both coaxial with the central axis of the rotor. The second outlet is multiple, and the multiple second outlets are arranged around the second inlet.

[0043] Optionally, at least one leg extending radially along the rotor is provided at one end of the conveying portion away from the mounting portion. One end of the leg away from the conveying portion is used for abutting against the channel wall of the cooling channel.

[0044] Optionally, an elastic pad is provided at one end of the leg away from the conveying portion.

[0045] Optionally, the mounting portion has a gradually expanding section. Both the second inlet and the second outlet are located on the gradually expanding section. Two ends of the gradually expanding section are respectively a small-diameter end and a large-diameter end. The small-diameter end is located between the large-diameter end and the conveying portion. Along the direction from the small-diameter end to the large-diameter end, the outer diameter of the gradually expanding section gradually increases. The second inlet is located at the small-diameter end, and the second outlet is arranged close to the large-diameter end.

[0046] According to a third aspect of the present disclosure, there is provided an electric drive assembly including the above-mentioned motor.

[0047] According to a fourth aspect of the present disclosure, there is provided a vehicle including the above-mentioned motor or electric drive assembly.

[0048] Through the above technical solution, the cover can be sleeved outside the end part of the stator winding located at the end of the stator core, so that the cover and the stator core jointly define a cooling cavity, the end part of the stator winding is located in the cooling cavity, and the cooling medium can flow into the cooling cavity through the first inlet, exchange heat with the end part of the stator winding in the cooling cavity, absorb the heat of the end part of the stator winding, and flow out of the cooling cavity through the first outlet after the heat exchange, and the heat of the end part of the stator winding is taken away by the cooling medium, so as to realize the heat dissipation and cooling of the end part of the stator winding and the stator winding.

[0049] First of all, since the stator winding cooling structure provided by the present disclosure jointly defines a cooling cavity for cooling the end part of the stator winding through the cover and the stator core, the cooling medium can cool the end part of the stator winding by flowing in the cooling cavity. Compared with the technical solution of dissipating heat from the stator winding by the rotor splashing oil in the related art, in the present disclosure, there is no need to spray and splash the cooling medium on the stator winding by the rotor during rotation to cool the stator winding. Therefore, no additional work is required for the rotor, and the isolation effect of the cooling cavity can prevent the cooling medium from existing between the stator and the rotor, thereby reducing the frictional resistance of the rotor rotation, and further being beneficial to improving the efficiency of the motor.

[0050] Secondly, since both the first inlet and the first outlet are formed on the cover, the cooling medium directly flows out of the cooling cavity after entering the cooling cavity and exchanging heat with the end part of the stator winding. The isolation effect of the cover can also prevent the cooling medium from flowing to other parts or other components of the motor, thereby avoiding the influence of the cooling medium on other components of the motor, and further reducing the sealing level requirements for other components of the motor, thus simplifying the manufacturing difficulty of the motor and reducing the manufacturing cost of the motor.

[0051] Furthermore, compared with the technical solution of dissipating heat from the stator winding by the rotor splashing oil in the related art, the amount, speed, etc. of the cooling medium flowing through the end part of the stator winding in the present disclosure are not affected by the rotor speed. Therefore, the present disclosure has better stability in dissipating heat from the stator winding.

[0052] Other features and advantages of the present disclosure will be described in detail in the subsequent specific implementation part. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] The drawings are used to provide a further understanding of the present disclosure, and constitute a part of the specification. They are used to explain the present disclosure together with the following specific implementation manners, but do not constitute a limitation to the present disclosure. In the drawings:

[0054] Figure 1 It is a perspective view of the stator winding cooling structure provided by an embodiment of the present disclosure and the stator core in an assembled state;

[0055] Figure 2 It is a cross-sectional view of the stator winding cooling structure provided by an embodiment of the present disclosure and the stator core in an assembled state;

[0056] Figure 3 It is a perspective view of the first cover body of the stator winding cooling structure provided by an embodiment of the present disclosure;

[0057] Figure 4 It is a perspective view of the second cover body of the stator winding cooling structure provided by an embodiment of the present disclosure;

[0058] Figure 5 It is a perspective view of the seal of the stator winding cooling structure provided by an embodiment of the present disclosure;

[0059] Figure 6 It is a perspective view of the rotor cooling structure provided by an embodiment of the present disclosure;

[0060] Figure 7 It is a cross-sectional view of the rotor cooling structure provided by an embodiment of the present disclosure and the rotor in an assembled state;

[0061] Figure 8 It is Figure 7 The partial enlarged view at position A in

[0062] Explanation of reference numerals

[0063] 100 - Stator winding cooling structure; 10 - Cover body; 11 - First inlet; 12 - First outlet; 13 - Outer ring part; 14 - Inner ring part; 15 - First cover body; 152 - Mounting lug; 153 - Mounting hole; 16 - Second cover body; 161 - Second positioning protrusion; 20 - Cooling cavity; 30 - Seal; 31 - Protruding part; 32 - Groove; 33 - Outer sealing ring; 34 - Inner sealing ring; 210 - Stator core; 211 - Ridge; 212 - Through hole; 220 - Stator winding; 221 - Stator winding end; 240 - Rotor; 250 - Rotor cooling structure; 251 - Cooling channel; 252 - Second inlet; 253 - Second outlet; 254 - Mounting part; 2541 - Diverging section; 255 - Conveying part; 2551 - Conveying channel; 256 - Leg; 257 - Elastic pad. Detailed implementation manners

[0064] The following will describe in detail the specific implementation manners of the present disclosure with reference to the accompanying drawings. It should be understood that the specific implementation manners described herein are only used to illustrate and explain the present disclosure, and are not used to limit the present disclosure.

[0065] In the present disclosure, unless otherwise stated, the orientation terms such as "upper", "lower", "top", and "bottom" are generally defined based on the upper, lower, top, and bottom of the stator winding cooling structure in its normal use state. This is only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, as well as a specific orientation structure and operation. Therefore, it should not be construed as a limitation to the present disclosure. "Inner" and "outer" refer to the inside and outside of the contour of the corresponding component. In addition, the terms "first", "second", etc. used are to distinguish one element from another, and do not have an order or importance.

[0066] In the description of the present disclosure, it should also be noted that unless otherwise clearly specified and limited, the terms "arranged", "connected", "coupled", and "installed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. It can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances.

[0067] As Figures 1 to 8 shown, according to the first aspect of the present disclosure, a stator winding cooling structure 100 is provided, including a cover 10. The cover 10 is configured to be arranged at at least one end of the stator core 210 and jointly define a cooling chamber 20 with the stator core 210 (such as the end face of the stator core 210). The cooling chamber 20 is used to accommodate the stator winding end 221 located at the end of the stator core 210. A first inlet 11 and a first outlet 12 that are both in communication with the cooling chamber 20 are formed on the cover 10. The first inlet 11 is used for the cooling medium to flow into the cooling chamber 20, and the first outlet 12 is used for the cooling medium in the cooling chamber 20 to flow out of the cooling chamber 20.

[0068] Through the above technical solution, the cover 10 can be arranged outside the stator winding end 221 located at the end of the stator core 210, so that the cover 10 and the stator core 210 jointly define the cooling chamber 20. The stator winding end 221 is located in the cooling chamber 20. The cooling medium can flow into the cooling chamber 20 through the first inlet 11, exchange heat with the stator winding end 221 in the cooling chamber 20, absorb the heat of the stator winding end 221, and flow out of the cooling chamber 20 through the first outlet 12 after the heat exchange. The heat of the stator winding end 221 is taken away by the cooling medium, thereby realizing the heat dissipation and cooling of the stator winding end 221 and the stator winding.

[0069] First, since the stator winding cooling structure 100 provided by the present disclosure defines a cooling cavity 20 for cooling the end portion 221 of the stator winding jointly by the cover 10 and the stator core 210, the cooling medium can flow in the cooling cavity 20 to cool the end portion 221 of the stator winding. Compared with the technical solution in the related art that dissipates heat from the stator winding by the rotor splashing oil, in the present disclosure, there is no need to spray and splash the cooling medium onto the stator winding during the rotation of the rotor to cool the stator winding. Therefore, there is no need for the rotor to do additional work, and the isolation effect of the cooling cavity 20 can prevent the cooling medium from existing between the stator and the rotor 240, thereby reducing the frictional resistance of the rotation of the rotor 240, and further facilitating the improvement of the efficiency of the motor.

[0070] Second, since both the first inlet 11 and the first outlet 12 are formed on the cover 10, after the cooling medium enters the cooling cavity 20 and exchanges heat with the end portion 221 of the stator winding, it directly flows out of the cooling cavity 20. The isolation effect of the cover 10 can also prevent the cooling medium from flowing to other parts or other components of the motor, thereby avoiding the influence of the cooling medium on other components of the motor, and further enabling the sealing level requirements for other components of the motor to be reduced, thus simplifying the manufacturing difficulty of the motor and reducing the manufacturing cost of the motor.

[0071] Furthermore, compared with the technical solution in the related art that dissipates heat from the stator winding by the rotor splashing oil, in the present disclosure, the amount, speed, etc. of the cooling medium flowing through the end portion 221 of the stator winding are not affected by the rotational speed of the rotor 240. Therefore, the present disclosure has better stability in dissipating heat from the stator winding 220.

[0072] It should be noted here that the end portion 221 of the stator winding located at the end of the stator core 210 is the main heat-generating part of the stator winding 220. Cooling the end portion 221 of the stator winding can meet the heat dissipation requirements for the stator winding 220.

[0073] To further improve the heat dissipation effect and heat dissipation efficiency of the end portion 221 of the stator winding, as an implementation manner, as Figure 2 shown, the first outlet 12 is located at the upper part of the cover 10, so that the cooling medium in the cooling cavity 20 can flow out of the cooling cavity 20 after submerging the end portion 221 of the stator winding.

[0074] Since the first outlet 12 is located at the upper part of the cover 10, the cooling medium in the cooling cavity 20 can flow out of the cooling cavity 20 after completely submerging the end portion 221 of the stator winding, which is beneficial to increasing the heat exchange area between the end portion 221 of the stator winding and the cooling medium. It can not only improve the heat dissipation effect and heat dissipation efficiency of the end portion 221 of the stator winding, but also enable each position of the end portion 221 of the stator winding to exchange heat with the cooling medium, and the heat dissipation is more uniform.

[0075] Here, the "upper and lower" of the cover 10 are defined based on the upper and lower directions of the motor in its normal use state. For example, when the cover 10 is installed on the stator core 210 whose axis extends horizontally (refer to Figure 2 as shown), the upper part of the cover 10 is the part of the cover 10 away from the ground, and the lower part of the cover 10 is the part of the cover 10 close to the ground.

[0076] It can be understood that the upper part of the cover 10 refers to the upper region of the cover 10, not limited to the topmost part of the cover 10. For example, it can refer to the top surface of the upper part of the cover 10 or the side surface of the upper part of the cover 10. Similarly, the lower part of the cover 10 refers to the lower region of the cover 10, not limited to the bottommost part of the cover 10. For example, it can refer to the bottom surface of the lower part of the cover 10 or the side surface of the lower part of the cover 10. The present disclosure does not make any limitations in this regard.

[0077] The present disclosure does not limit the position of the first inlet 11 on the cover 10. As an implementation manner, as Figure 2 shown, the first inlet 11 can be located at the lower part of the cover 10. With such a setting, on the one hand, it can prevent the cooling medium flowing into the cooling cavity 20 from the first inlet 11 from impacting the cover 10 or the end part of the stator winding 221 under the action of gravity, which is beneficial to reducing the impact damage or erosion damage of the cover 10 or the end part of the stator winding 221 caused by the cooling medium. On the other hand, it is also beneficial to form a stable flow direction of the cooling medium in the cooling cavity 20, so that the cooling medium after heat exchange can flow out of the cooling cavity 20 in time, which is beneficial to improving the stability of heat dissipation of the end part of the stator winding 221.

[0078] As other implementation manners of the present disclosure, the first inlet 11 can be located at the upper part of the cover 10, and the first outlet 12 is located at the lower part of the cover 10. The cooling medium entering the cooling cavity 20 flows through the end part of the stator winding 221 from top to bottom and then flows out of the cooling cavity 20.

[0079] In order to prevent the cooling medium in the cooling cavity 20 from leaking, as an implementation manner, as Figure 5 shown, the stator winding cooling structure 100 further includes a seal 30, and the seal 30 is used to seal the gap between one end of the cover 10 close to the stator core 210 and the end face of the stator core 210. By sealing the gap between one end of the cover 10 close to the stator core 210 and the end face of the stator core 210 with the seal 30, the sealing performance between the cover 10 and the end face of the stator core 210 can be improved, which is beneficial to preventing the cooling medium from leaking out of the cooling cavity 20 and enhancing the sealing performance of the cooling cavity 20.

[0080] Optionally, as Figure 3 、 Figure 4 and Figure 5As shown, on one side of the seal 30 close to the cover 10, a protruding portion 31 is formed, and on one side of the cover 10 close to the seal 30, a groove 32 that cooperates with the protruding portion 31 is formed. Alternatively, on one side of the seal 30 close to the cover 10, a groove 32 is formed, and on one side of the cover 10 close to the seal 30, a protruding portion 31 that cooperates with the groove 32 is formed.

[0081] Through the cooperation of the protruding portion 31 and the groove 32, on the one hand, it is convenient to position the seal 30 on the cover 10, ensuring that the seal 30 is assembled in the correct position on the cover 10. On the other hand, it can increase the difficulty for the cooling medium to pass through the gap between the seal 30 and the cover 10, thereby facilitating the improvement of the sealing performance between the seal 30 and the cover 10. On the still other hand, it can also make the connection between the seal 30 and the cover 10 more firm.

[0082] Here, the side of the seal 30 away from the cover 10 is a plane to facilitate fitting with the stator core 210. Alternatively, it can also be connected to the stator core 210 through a protruding portion or a groove similar to those described above. For example, a convex portion is provided on the side of the seal 30 away from the cover 10, and the convex portion cooperates with a concave portion on the stator core 210. The present disclosure does not limit this.

[0083] In order to improve the sealing performance between the seal 30, the cover 10, and the stator core 210, as an implementation manner, the stator winding cooling structure 100 may further include a first adhesive layer and a second adhesive layer. The side of the seal 30 close to the cover 10 is hermetically bonded to the cover 10 through the first adhesive layer, and the side of the seal 30 facing away from the cover 10 is used to be hermetically bonded to the end face of the stator core 210 through the second adhesive layer.

[0084] The sealing performance between the seal 30 and the cover 10 can be improved by hermetically bonding the side of the seal 30 close to the cover 10 to the cover 10 through the first adhesive layer, and the sealing performance between the seal 30 and the stator core 210 can be improved by hermetically bonding the side of the seal 30 facing away from the cover 10 to the end face of the stator core 210 through the second adhesive layer, thereby improving the sealing performance between the cover 10 and the stator core 210.

[0085] In addition, the setting of the first adhesive layer and the second adhesive layer is also conducive to improving the connection firmness between the seal 30, the cover 10, and the stator core 210.

[0086] The present disclosure does not limit the structure of the cover 10. As an implementation manner, as Figure 3 and Figure 4 shown, the cover 10 can be formed as a ring and includes an outer ring portion 13, an inner ring portion 14, and a connecting portion connecting between the outer ring portion 13 and the inner ring portion 14. The outer ring portion 13, the connecting portion, and the inner ring portion 14 can jointly enclose an annular cooling cavity 20 with the end face of the stator core 210.

[0087] Since the rotor 240 of the motor can pass through the space defined by the inner side of the inner ring portion 14 and be connected to other structures (for example, connected to the input shaft of the speed reducer), therefore, the housing 10 is configured as the above structure. On the one hand, it can form the cooling cavity 20 with the stator core 210, and on the other hand, it will not affect the connection between the motor and other structures, thus facilitating the improvement of the applicability of the stator winding cooling structure 100 of the present disclosure.

[0088] For the housing 10 of the above embodiment, in order to ensure the seal between the housing 10 and the stator core 210, as Figure 3 shown, the seal 30 may include an outer seal ring 33 and an inner seal ring 34. The outer seal ring 33 is disposed at one end of the outer ring portion 13 close to the stator core 210, and the inner seal ring 34 is disposed at one end of the inner ring portion 14 close to the stator core 210. That is, the gap between the outer ring portion 13 and the stator core 210 is sealed by the outer seal ring 33, and the gap between the inner ring portion 14 and the stator core 210 is sealed by the inner seal ring 34, thereby ensuring the seal between the housing 10 of this structure and the stator core 210.

[0089] Optionally, the above-mentioned protrusions 31 or grooves 32 may also be provided on the inner seal ring 34 and the outer seal ring 33.

[0090] In other embodiments, the housing 10 may also be formed as a cylindrical shape, and an annular opening for the end portion 221 of the stator winding to extend into is formed at one end of the cylindrical housing 10.

[0091] For a motor in which both ends of the stator core 210 have the end portions 221 of the stator winding, as Figures 1 to 4 shown, the housing 10 may include a first housing 15 and a second housing 16, and the first housing 15 and the second housing 16 are respectively used to be disposed at both ends of the stator core 210.

[0092] It can be understood that, as Figure 2 shown, both the first housing 15 and the second housing 16 have a first inlet 11, a first outlet 12, and a cooling cavity 20, and the first inlets 11 and the first outlets 12 on the first housing 15 and the second housing 16 can be arranged with reference to the descriptions in the above text (for example, the first inlet 11 on the first housing 15 is located at the lower part of the first housing 15, the first outlet 12 on the first housing 15 is located at the upper part of the first housing 15, the first inlet 11 on the second housing 16 is located at the lower part of the second housing 16, and the first outlet 12 on the second housing 16 is located at the upper part of the second housing 16).

[0093] Since both the first cover 15 and the second cover 16 are provided with a first inlet 11, a first outlet 12, and a cooling cavity 20, heat dissipation of the end portions 221 of the stator windings at both ends of the stator core 210 can be achieved by introducing a cooling medium into the cooling cavity 20 in the first cover 15 and the cooling cavity 20 in the second cover 16. Moreover, since the cooling cavity 20 of the first cover 15 and the cooling cavity 20 of the second cover 16 are independent of each other, the cooling medium introduced into the cooling cavity 20 of the first cover 15 and the cooling cavity 20 of the second cover 16 can be controlled separately, so that the end portions 221 of the stator windings at both ends of the stator core 210 can be well cooled.

[0094] Optionally, both the first cover 15 and the second cover 16 are mounted on the motor housing.

[0095] To improve the stability of the cover 10 mounted on the motor housing, as an implementation manner, as Figure 1 and Figure 2 shown, a plurality of first positioning protrusions may be provided at one end of the first cover 15 away from the second cover 16, and the plurality of first positioning protrusions are respectively used to be inserted into a plurality of first positioning grooves on the inner wall of the motor housing. Alternatively, a plurality of second positioning protrusions 161 may be provided at one end of the second cover 16 away from the first cover 15, and the plurality of second positioning protrusions 161 are respectively used to be inserted into a plurality of second positioning grooves on the inner wall of the motor housing. Alternatively, a plurality of first positioning protrusions are provided at one end of the first cover 15 away from the second cover 16, and the plurality of first positioning protrusions are respectively used to be inserted into a plurality of first positioning grooves on the inner wall of the motor housing, and a plurality of second positioning protrusions 161 are provided at one end of the second cover 16 away from the first cover 15, and the plurality of second positioning protrusions 161 are respectively used to be inserted into a plurality of second positioning grooves on the inner wall of the motor housing.

[0096] The plurality of first positioning protrusions can be respectively inserted into the plurality of first positioning grooves on the inner wall of the motor housing. By the limiting effect of the plurality of first positioning grooves on the plurality of first positioning protrusions, the first cover 15 can be prevented from moving relative to the motor housing, which is beneficial to improving the stability of the first cover 15 mounted on the motor housing.

[0097] Similarly, the plurality of second positioning protrusions 161 can be respectively inserted into the plurality of second positioning grooves on the inner wall of the motor housing. By the limiting effect of the plurality of second positioning grooves on the plurality of second positioning protrusions 161, the second cover 16 can be prevented from moving relative to the motor housing. This is beneficial to improving the stability of the first cover 15 mounted on the motor housing, and thus beneficial to improving the stability of the second cover 16 mounted on the motor housing.

[0098] To ensure that the cover body 10 is installed on the motor housing in a desired posture (for example, the first inlet 11 is located at the lower part of the cover body 10 and the first outlet 12 is located at the upper part of the cover body 10), as an implementation manner, as Figure 1 shown, a plurality of first positioning protrusions are arranged at unequal intervals along the circumferential direction of the first cover body 15. Alternatively, a plurality of second positioning protrusions 161 are arranged at unequal intervals along the circumferential direction of the second cover body 16. Alternatively, a plurality of first positioning protrusions are arranged at unequal intervals along the circumferential direction of the first cover body 15, and a plurality of second positioning protrusions 161 are arranged at unequal intervals along the circumferential direction of the second cover body 16.

[0099] The arrangement of a plurality of first positioning protrusions at unequal intervals along the circumferential direction of the first cover body 15 enables the plurality of first positioning protrusions to be inserted into the plurality of first positioning grooves only when the first cover body 15 is in the desired posture, thereby ensuring that the first cover body 15 is installed on the motor housing in the desired posture. Similarly, the arrangement of a plurality of second positioning protrusions 161 at unequal intervals along the circumferential direction of the second cover body 16 enables the plurality of second positioning protrusions 161 to be inserted into the plurality of second positioning grooves only when the second cover body 16 is in the desired posture, thereby ensuring that the second cover body 16 is installed on the motor housing in the desired posture.

[0100] It can be understood that the arrangement of a plurality of first positioning protrusions at unequal intervals along the circumferential direction of the first cover body 15 means that the distance between at least one pair of adjacent first positioning protrusions among the plurality of first positioning protrusions is not equal to the distance between any other pair of adjacent first positioning protrusions.

[0101] Similarly, the arrangement of a plurality of second positioning protrusions 161 at unequal intervals along the circumferential direction of the second cover body 16 means that the distance between at least one pair of adjacent second positioning protrusions 161 among the plurality of second positioning protrusions 161 is not equal to the distance between any other pair of adjacent second positioning protrusions 161.

[0102] To ensure that the cover body 10 is installed on the motor housing in a desired posture (such as the first inlet 11 is located at the lower part of the cover body 10 and the first outlet 12 is located at the upper part of the cover body 10), as another implementation manner, as Figure 1 shown, a plurality of first positioning protrusions are not symmetric about any radial line passing through the center of the first cover body 15 along the radial direction of the first cover body 15. Alternatively, a plurality of second positioning protrusions 161 are not symmetric about any radial line passing through the center of the second cover body 16 along the radial direction of the second cover body 16. Alternatively, a plurality of first positioning protrusions are not symmetric about any radial line passing through the center of the first cover body 15 along the radial direction of the first cover body 15, and a plurality of second positioning protrusions 161 are not symmetric about any radial line passing through the center of the second cover body 16 along the radial direction of the second cover body 16.

[0103] The multiple first positioning protrusions are not symmetrical with respect to any radial line passing through the center of the first housing 15 along the radial direction of the first housing 15. This enables the multiple first positioning protrusions to be inserted into the multiple first positioning grooves only when the first housing 15 is in the desired posture, thereby ensuring that the first housing 15 is installed on the motor housing in the desired posture. Similarly, the multiple positioning protrusions are not symmetrical with respect to any radial line passing through the center of the second housing 16 along the radial direction of the second housing 16. This enables the multiple second positioning protrusions 161 to be inserted into the multiple second positioning grooves only when the second housing 16 is in the desired posture, thereby ensuring that the second housing 16 is installed on the motor housing in the desired posture.

[0104] It can be understood that the multiple first positioning protrusions are not symmetrical with respect to any radial line passing through the center of the first housing 15 along the radial direction of the first housing 15, which means that there are multiple radial lines passing through the center of the first housing 15 along the radial direction of the first housing 15, and the multiple first positioning protrusions are not symmetrical with respect to any one of the multiple radial lines.

[0105] Similarly, the multiple second positioning protrusions 161 are not symmetrical with respect to any radial line passing through the center of the second housing 16 along the radial direction of the first housing 15, which means that there are multiple radial lines passing through the center of the second housing 16 along the radial direction of the second housing 16, and the multiple second positioning protrusions 161 are not symmetrical with respect to any one of the multiple radial lines.

[0106] The present disclosure does not limit the connection manner between the housing 10 and the motor housing. As an implementation manner, the first housing 15 is configured to be connectable to the motor housing through fasteners to press the second housing 16 against the inner wall of the motor housing. That is, by connecting to the motor housing through fasteners, the inner wall of the motor housing and the first housing 15 jointly clamp the stator core 210 and the second housing 16.

[0107] For this embodiment, the second housing 16 may be provided with second positioning protrusions 161, the first housing 15 may not be provided with first positioning protrusions, and the inner wall of the motor housing can indirectly press the second housing 16 against the inner wall of the motor housing by abutting against the second positioning protrusions 161, thereby simplifying the installation process of the housing 10.

[0108] To facilitate the connection of the first housing 15 to the motor housing through fasteners, as an implementation manner, as Figure 3 shown, the first housing 15 may be provided with multiple mounting lugs 152 protruding radially from the first housing 15 along the radial direction of the first housing 15, and each mounting lug 152 is formed with a mounting hole 153 for the fastener to pass through. Such a setting is conducive to avoiding interference between the fasteners and the second housing 16 and the stator core 210.

[0109] In other embodiments, mounting holes 153 for fasteners to pass through may be formed on the first cover 15, and avoidance portions for avoiding the fasteners may be formed on the second cover 16 and the stator core 210.

[0110] In the present disclosure, the first inlet 11 and the first outlet 12 may be set to any suitable size, and the present disclosure does not limit this. As an embodiment, the diameter of the first inlet 11 may be 5 mm to 7 mm, and / or the diameter of the first outlet 12 may be 5 mm to 7 mm, so as to facilitate the cooling medium flowing through the cooling chamber 20 to have a suitable flow rate under a suitable flow resistance. For example, the flow rate of the cooling medium flowing through the cooling chamber 20 may be in the range of 10 L / min to 20 L / min.

[0111] According to the second aspect of the present disclosure, as Figure 2 shown, a motor is provided, including a stator core 210, a stator winding 220, and the above-mentioned stator winding cooling structure 100. The stator winding 220 has a stator winding end 221 located at the end of the stator core 210. The cover 10 is disposed at at least one end of the stator core 210 and together with the stator core 210 defines a cooling chamber 20, and the stator winding end 221 is received in the cooling chamber 20.

[0112] In order to better clamp the second cover 16 and the stator core 210 between the first cover 15 and the inner wall of the motor housing, as an embodiment, the cover 10 may include a first cover 15 and a second cover 16. The first cover 15 and the second cover 16 respectively cover the outside of the stator winding ends 221 located at both ends of the stator core 210. The motor further includes a motor housing, and the motor housing includes a first half shell and a second half shell. The first cover 15 is disposed close to the second half shell, and the second cover 16 is disposed close to the first half shell. The first cover 15 is connected to the first half shell by fasteners so that the second cover 16 can be pressed against the inner wall of the first half shell. An abutting protrusion is further provided on the inner wall of the second half shell, and the abutting protrusion abuts against the side of the first cover 15 facing away from the second cover 16.

[0113] Since the abutting protrusion is provided on the inner wall of the second half shell, after the first half shell and the second half shell are connected, the abutting protrusion can abut against the side of the first cover 15 facing away from the second cover 16, so that the first cover 15 can better clamp the second cover 16 and the stator core 210 between the inner wall of the motor housing, thereby facilitating further improving the sealing performance between the first cover 15 and the second cover 16 and the stator core 210.

[0114] Optionally, the second half shell may be a motor end cover, and the abutting protrusion may be formed on the motor end cover.

[0115] Since there may be manufacturing tolerances in each of the above components, the abutting protrusion can be an elastic protrusion, so as to avoid the situation that the abutting protrusion cannot abut against the first cover 15 or the first cover 15 being deformed by the abutting protrusion.

[0116] To prevent the stator core 210 from rotating, as an implementation, as Figures 1 to 3 shown, a plurality of ridges 211 extending along the axial direction of the stator core 210 can be formed on the outer peripheral surface of the stator core 210, and through holes 212 are formed on each ridge 211. The cover 10 includes a first cover 15 and a second cover 16. The first cover 15 and the second cover 16 are respectively arranged at both ends of the stator core 210. A plurality of mounting lugs 152 protruding radially from the first cover 15 are provided on the first cover 15, and mounting holes 153 are formed on each mounting lug 152. The motor further includes a motor housing, and a fastener passes through the mounting hole 153 and the through hole 212 to be connected with the motor housing.

[0117] By connecting the fastener through the mounting hole 153 and the through hole 212 to the motor housing, not only can the first cover 15 be connected to the motor housing and jointly clamp the second cover 16 and the motor core with the inner wall of the motor housing, but also the circumferential locking of the stator core 210 can be achieved, thereby preventing the stator core 210 from rotating.

[0118] To achieve heat dissipation for the rotor 240 of the motor, as an implementation, as Figure 7 shown, the motor may further include a rotor 240 and a rotor cooling structure 250. A cooling channel 251 extending along the axial direction of the rotor 240 is formed in the rotor 240. The rotor cooling structure 250 is installed in the cooling channel 251. The rotor cooling structure 250 is provided with a second inlet 252 and a second outlet 253. The second inlet 252 is used for cooling medium to enter the cooling channel 251, and the second outlet 253 is used for cooling medium to flow out of the cooling channel 251.

[0119] Since a cooling channel 251 extending along the axial direction of the rotor 240 is formed in the rotor 240 and the rotor cooling structure 250 is installed in the cooling channel 251, the cooling medium can be introduced into the cooling channel through the second inlet 252. After cooling the rotor 240, the cooling medium flows out of the cooling channel through the second outlet 253, thereby achieving heat dissipation for the rotor 240 of the motor.

[0120] To enable the cooling medium to better exchange heat with the cooling channel 251, as an implementation, as Figure 6 and Figure 7As shown, the rotor cooling structure 250 includes a mounting portion 254 and a conveying portion 255. The mounting portion 254 is used to connect with the channel wall of the cooling channel 251. The second inlet 252 and the second outlet 253 are both formed on the mounting portion 254. The conveying portion 255 extends along the axial direction of the rotor 240. A conveying channel 2551 for the cooling medium to flow through is formed in the conveying portion 255. One end of the conveying channel 2551 communicates with the second inlet 252, and the other end of the conveying channel 2551 communicates with the cooling channel 251.

[0121] Since the conveying portion 255 extends along the axial direction of the rotor 240, a conveying channel 2551 for the cooling medium to flow through is formed in the conveying portion 255, one end of the conveying channel 2551 communicates with the second inlet 252, and the other end of the conveying channel 2551 communicates with the cooling channel 251. Therefore, the cooling medium can flow into one end of the cooling channel 251 far from the mounting portion 254 through the conveying channel 2551, and then flow from the end of the cooling channel 251 far from the mounting portion 254 to the end of the cooling channel 251 close to the mounting portion 254. After completely flowing through the entire cooling channel 251, it flows out of the cooling channel 251 from the second outlet 253, so that the cooling medium can better exchange heat with the cooling channel 251, which is beneficial to improving the heat dissipation effect of the rotor 240 of the motor.

[0122] Moreover, since both the second inlet 252 and the second outlet 253 are located at one end of the cooling channel 251, it is also convenient for the design and installation of the inlet pipe and the outlet pipe of the cooling medium.

[0123] Here, the cooling channel 251 can be configured as a cooling channel 251 that is only penetrated at one end, or can be configured as a cooling channel 251 that is penetrated at both ends. When the cooling channel 251 is a cooling channel 251 that is penetrated at both ends, one end of the cooling channel 251 far from the mounting portion 254 can be sealed through other components. For example, a spline groove is formed in one end of the cooling channel 251 far from the mounting portion 254, and the spline groove is in interference fit with the spline on the input shaft of the speed reducer, so as to realize the sealing of one end of the mounting portion 254.

[0124] In order to further improve the heat exchange effect between the cooling medium and the cooling channel 251, as an implementation manner, as Figure 8 shown, the central axis of the conveying portion 255 and the central axis of the second inlet 252 are both coaxial with the central axis of the rotor 240. The second outlet 253 is multiple, and the multiple second outlets 253 are arranged around the second inlet 252.

[0125] Since the central axes of both the conveying part 255 and the second inlet 252 are coaxial with the central axis of the rotor 240, and the plurality of second outlets 253 are arranged around the second inlet 252, under the centrifugal force generated by the rotation of the rotor 240, the cooling medium can be evenly distributed on the channel wall of the cooling flow path, which is beneficial to further improving the heat exchange effect between the cooling medium and the cooling channel 251.

[0126] To prevent the free end of the conveying part 255 from jittering and deviating from the central axis of the rotor 240 when the rotor 240 rotates, as an implementation manner, as Figure 6 and Figure 7 shown, at least one leg 256 extending radially along the rotor 240 can be provided at one end of the conveying part 255 away from the mounting part 254, and one end of the leg 256 away from the conveying part 255 can abut against the channel wall of the cooling channel 251. Through the support of the leg 256, the conveying part 255 can be prevented from jittering when the rotor 240 rotates, thereby preventing the conveying part 255 from deviating from the central axis of the rotor 240.

[0127] The present disclosure does not limit the number of the legs 256. Optionally, the legs 256 can be provided in three, and the three legs 256 are arranged at equal intervals along the circumferential direction of the conveying part 255.

[0128] Optionally, as Figure 6 shown, an elastic pad 257 is provided at one end of the leg 256 away from the conveying part 255. One end of the leg 256 away from the conveying part 255 can abut against the channel wall of the cooling channel 251 through the elastic pad 257, thereby preventing the channel wall of the cooling channel 251 from being worn due to hard contact with the leg 256.

[0129] To further improve the heat dissipation effect of the rotor cooling structure 250 on the rotor 240, as an implementation manner, as Figure 8 shown, the mounting part 254 has a gradually expanding section 2541, both the second inlet 252 and the second outlet 253 are located on the gradually expanding section 2541, the two ends of the gradually expanding section 2541 are respectively a small-diameter end and a large-diameter end, the small-diameter end is located between the large-diameter end and the conveying part 255, and along the direction from the small-diameter end to the large-diameter end, the outer diameter of the gradually expanding section 2541 gradually increases, the second inlet 252 is located at the small-diameter end, and the second outlet 253 is arranged close to the large-diameter end.

[0130] During the flow of the cooling medium in the cooling channel 251, since it participates in heat exchange, the heat of the cooling medium will gradually increase. As the second inlet 252 is located at the small-diameter end and the second outlet 253 is arranged near the large-diameter end, therefore, the cooling medium with the highest temperature in the cooling flow channel will not accumulate at the second inlet 252, which is beneficial to reducing the influence of the high-temperature cooling medium on the low-temperature cooling medium, and thus is beneficial to further improving the heat dissipation effect of the rotor cooling structure 250 on the rotor 240.

[0131] According to the third aspect of the present disclosure, there is provided an electric drive assembly including the above-mentioned motor.

[0132] Optionally, the electric drive assembly includes an electric drive assembly housing. At least part of the motor housing mentioned above can be a part of the electric drive assembly housing, that is, at least part of the motor housing and the electric drive assembly housing are formed as a whole, and at least part of the motor housing can also be connected to the electric drive assembly housing. The present disclosure does not limit this.

[0133] According to the fourth aspect of the present disclosure, there is provided a vehicle including the above-mentioned motor or electric drive assembly.

[0134] The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings. However, the present disclosure is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0135] In addition, it should be noted that, in the case of no contradiction, the various specific technical features described in the above specific embodiments can be combined in any suitable manner. To avoid unnecessary repetition, the present disclosure does not separately describe various possible combination methods.

[0136] In addition, any combination can be made between various different embodiments of the present disclosure as long as it does not violate the idea of the present disclosure, and it should also be regarded as the content disclosed by the present disclosure.

Claims

1. A stator winding cooling structure, characterized in that, It includes a cover body which is used to be arranged at at least one end of the stator core and jointly define a cooling cavity with the stator core, and the cooling cavity is used to accommodate the end part of the stator winding located at the end of the stator core; A first inlet and a first outlet which are both communicated with the cooling cavity are formed on the cover body. The first inlet is used for allowing a cooling medium to flow into the cooling cavity, and the first outlet is used for allowing the cooling medium in the cooling cavity to flow out of the cooling cavity.

2. The stator winding cooling structure according to claim 1, characterized in that The first outlet is located at the upper part of the cover body so that the cooling medium in the cooling cavity can flow out of the cooling cavity after submerging the end part of the stator winding.

3. The stator winding cooling structure according to claim 2, wherein The first inlet is located at the lower part of the cover body.

4. The stator winding cooling structure according to claim 1, characterized in that, The stator winding cooling structure further includes a seal which is used to seal the gap between one end of the cover body close to the stator core and the end face of the stator core.

5. The stator winding cooling structure according to claim 4, wherein A protruding part is formed on one side of the seal close to the cover body, and a groove which is matched with the protruding part is formed on one side of the cover body close to the seal; or A groove is formed on one side of the seal close to the cover body, and a protruding part which is matched with the groove is formed on one side of the cover body close to the seal.

6. The stator winding cooling structure according to claim 4, wherein, The stator winding cooling structure further includes a first glue layer and a second glue layer. One side of the seal close to the cover body is hermetically bonded with the cover body through the first glue layer, and one side of the seal away from the cover body is used to be hermetically bonded with the end face of the stator core through the second glue layer.

7. The stator winding cooling structure according to any one of claims 1-6, characterized in that, The cover body is formed into a ring shape and includes an outer ring part, an inner ring part and a connecting part connected between the outer ring part and the inner ring part. The outer ring part, the connecting part and the inner ring part are used to jointly enclose the annular cooling cavity with the end face of the stator core.

8. The stator winding cooling structure according to claim 7, characterized in that, The stator winding cooling structure further includes a seal which includes an outer seal ring and an inner seal ring. The outer seal ring is arranged at one end of the outer ring part close to the stator core, and the inner seal ring is arranged at one end of the inner ring part close to the stator core.

9. The stator winding cooling structure according to any one of claims 1-6, characterized in that The cover body includes a first cover body and a second cover body which are used to be respectively arranged at two ends of the stator core; Both the first cover body and the second cover body are installed on the motor housing.

10. The stator winding cooling structure according to claim 9, wherein, A plurality of first positioning protrusions are arranged at one end of the first cover body away from the second cover body, and the plurality of first positioning protrusions are used to be respectively inserted into a plurality of first positioning grooves on the inner wall of the motor housing; and / or A plurality of second positioning protrusions are arranged at one end of the second cover body away from the first cover body, and the plurality of second positioning protrusions are used to be respectively inserted into a plurality of second positioning grooves on the inner wall of the motor housing.

11. The stator winding cooling structure according to claim 10, wherein, The plurality of first positioning protrusions are arranged at non-uniform intervals along the circumferential direction of the first cover body; and / or The plurality of second positioning protrusions are arranged at non-uniform intervals along the circumferential direction of the second cover body.

12. The stator winding cooling structure according to claim 10, wherein, The plurality of first positioning protrusions are not symmetrical about any radial line along the radial direction of the first cover body passing through the center of the first cover body; and / or The plurality of second positioning protrusions are not symmetrical about any radial line along the radial direction of the second cover body passing through the center of the second cover body.

13. The stator winding cooling structure according to claim 9, characterized in that, The first cover body is configured to be connectable to the motor housing via a fastener so as to press the second cover body against the inner wall of the motor housing.

14. The stator winding cooling structure according to claim 13, wherein, The first cover body is provided with a plurality of mounting lugs protruding from the first cover body in a radial direction of the first cover body, and each of the mounting lugs is formed with a mounting hole for the fastener to pass through.

15. The stator winding cooling structure according to any one of claims 1-6, characterized in that, The diameter of the first inlet is 5 mm to 7 mm; and / or, The diameter of the first outlet is 5 mm to 7 mm.

16. A motor, characterized in that, Comprising a stator core, a stator winding and a stator winding cooling structure according to any one of claims 1 to 15; The stator winding has a stator winding end portion located at the end of the stator core. The cover body is arranged at at least one end of the stator core and defines a cooling cavity together with the stator core. The stator winding end portion is accommodated in the cooling cavity.

17. The motor according to claim 16, characterized in that, The cover body includes a first cover body and a second cover body, and the first cover body and the second cover body are respectively arranged outside the stator winding ends located at two ends of the stator core; The motor also includes a motor housing, which includes a first half shell and a second half shell, the first cover body is arranged close to the second half shell, the second cover body is arranged close to the first half shell, the first cover body is connected to the first half shell by a fastener so that the second cover body can be pressed against the inner wall of the first half shell, and an abutment protrusion is also arranged on the inner wall of the second half shell, and the abutment protrusion abuts against the side of the first cover body facing away from the second cover body.

18. The motor according to claim 17, characterized in that, The abutting protrusion is an elastic protrusion.

19. The motor according to claim 16, characterized in that, A plurality of ridges extending in the axial direction of the stator core are formed on the outer peripheral surface of the stator core, and each of the ridges is formed with a through hole; The cover body comprises a first cover body and a second cover body, the first cover body and the second cover body are respectively arranged at two ends of the stator core, the first cover body is provided with a plurality of mounting lugs protruding from the first cover body in a radial direction of the first cover body, and each of the mounting lugs is formed with a mounting hole; The motor further comprises a motor housing, and a fastener passes through the mounting hole and the through hole to be connected to the motor housing.

20. The motor according to claim 16, characterized in that, The motor also includes a rotor and a rotor cooling structure; A cooling channel extending along the axial direction of the rotor is formed in the rotor, and the rotor cooling structure is installed in the cooling channel. The rotor cooling structure is provided with a second inlet and a second outlet, the second inlet is used for cooling medium to enter the cooling channel, and the second outlet is used for cooling medium to flow out of the cooling channel.

21. The motor according to claim 20, characterized in that, The rotor cooling structure comprises a mounting portion and a conveying portion, the mounting portion is used to be connected to a channel wall of the cooling channel, and the second inlet and the second outlet are both formed on the mounting portion; The conveying portion extends along the axial direction of the rotor. A conveying channel for the cooling medium to flow through is formed in the conveying portion. One end of the conveying channel is communicated with the second inlet, and the other end of the conveying channel is communicated with the cooling channel.

22. The motor according to claim 21, characterized in that, The central axis of the conveying part and the central axis of the second inlet are both coaxial with the central axis of the rotor, and there are multiple second outlets which are arranged around the second inlet.

23. The motor according to claim 21, characterized in that, At least one leg extending radially along the rotor is provided at one end of the conveying part away from the mounting part, and one end of the leg away from the conveying part is used for abutting against the channel wall of the cooling channel.

24. The motor according to claim 23, characterized in that, An elastic pad is provided at one end of the leg away from the conveying part.

25. The electric machine according to any one of claims 22 - 24, characterized in that, The mounting part has a tapered section, and both the second inlet and the second outlet are located on the tapered section. The two ends of the tapered section are respectively a small-diameter end and a large-diameter end. The small-diameter end is located between the large-diameter end and the conveying part. Along the direction from the small-diameter end to the large-diameter end, the outer diameter of the tapered section gradually increases. The second inlet is located at the small-diameter end, and the second outlet is arranged close to the large-diameter end.

26. An electric drive assembly, characterized in that, Including the motor according to any one of claims 16-25.

27. A vehicle, characterized in that, Including the motor according to any one of claims 16-25; or, The electric drive assembly according to claim 26.

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