Electric motor stator cooling structure and electric motor

Abstract

The present invention provides a motor stator cooling structure and an electric motor, the motor stator cooling structure including a first sealing oil cover and a second sealing oil cover, the first sealing oil cover having an oil inlet and the second sealing oil cover having an oil outlet, the first sealing oil cover and the second sealing oil cover respectively covering two opposite ends of the stator winding, such that the first sealing oil cover and one end face of the stator core surround a first cavity structure which is in communication with the oil inlet, and the second sealing oil cover and another end face of the stator core surround a second cavity structure which is in communication with the oil outlet, and a cooling oil passage is provided inside the stator core which connects the first cavity structure and the second cavity structure. Cooling oil can flow sequentially through the front end of the stator winding, the stator core, and the rear end of the stator winding before flowing out the oil outlet, thereby uniformly cooling the entire stator module.

Description

[Technical Field]

[0001] The present invention relates to the technical field of electric motors, and more particularly to an electric motor stator cooling structure and an electric motor. [Background technology]

[0002] With the development of new energy vehicles, electric motors are gradually evolving toward smaller volume and higher power density, placing higher requirements on the heat dissipation capabilities of electric motors. There are various conventional motor cooling methods, among which the one with the highest cooling effect is stator winding oil immersion cooling, which specifically uses an oil cover to enclose both ends of the stator winding in sealed cavities and immerse the ends of the stator winding in cooling oil to cool them. However, this cooling method can only perform heat exchange at the ends of the stator winding, and there may be cases where heat exchange is uneven throughout the stator module, resulting in limited cooling effect for the entire stator module. Summary of the Invention [Problem to be solved by the invention]

[0003] The problem that the present invention seeks to solve is how to achieve effective heat exchange throughout the stator module and uniform cooling of the stator module. [Means for solving the problem]

[0004] In order to solve the above problems, the present invention provides a motor stator cooling structure, which includes a first sealing oil cover and a second sealing oil cover, wherein the first sealing oil cover is provided with an oil supply hole and the second sealing oil cover is provided with an oil discharge hole, the first sealing oil cover and the second sealing oil cover are used to cover two opposite ends of a stator winding, respectively, so that the first sealing oil cover and one end face of the stator core surround a first cavity structure, which communicates with the oil supply hole, and the second sealing oil cover and the other end face of the stator core surround a second cavity structure, which communicates with the oil discharge hole, and a cooling oil passage is provided inside the stator core, which communicates with the first cavity structure and the second cavity structure.

[0005] The technical effects of the present invention are as follows: the first sealing oil cover and the second sealing oil cover may cover two opposite ends of the stator winding, so that the first sealing oil cover and one end face of the stator core surround the first cavity structure, one end of the stator winding is located within the first cavity structure, the second sealing oil cover and another end face of the stator core surround the second cavity structure, and the other end of the stator winding is located within the second cavity structure, and the cooling oil passage inside the stator core communicates with the first cavity structure and the second cavity structure, so that the first cavity structure, the cooling oil passage, and the second cavity structure can form a completely sealed cavity. When the motor needs to be cooled, the cooling oil can flow into the first cavity structure through the oil supply hole, then into the stator core through the cooling oil passage, and then into the second cavity structure along the cooling oil passage, so that the cooling oil can pass through the front end of the stator winding, the stator core, and the rear end of the stator winding in order, and then flow out through the oil discharge hole, and the entire stator module can contact the cooling oil, that is, the entire stator module can be effectively heat-exchanged and cooled, and the stator module can be cooled uniformly.

[0006] Preferably, the first sealed oil cover includes a first oil cover body, a first inner ring portion, and a first outer ring portion, the first inner ring portion and the first outer ring portion are respectively connected to the first oil cover body, and the first inner ring portion, the first outer ring portion, and the first oil cover body form a first annular groove structure, an open end of which is used to abut against the end face of the stator core, thereby surrounding the first cavity structure; and the second sealed oil cover includes a second oil cover body, a second inner ring portion, and a second outer ring portion, the second inner ring portion and the second outer ring portion are respectively connected to the second oil cover body, and the second inner ring portion, the second outer ring portion, and the second oil cover body form a second annular groove structure, an open end of which is used to abut against the end face of the stator core, thereby surrounding the second cavity structure.

[0007] Preferably, the electric motor stator cooling structure further includes a sealing ring attached to an end face of the stator core, and a plurality of protruding teeth are provided at intervals on one end of the sealing ring facing the stator core, the plurality of protruding teeth are used to be inserted into a plurality of slots of the stator core in one-to-one correspondence, and the sealing ring is provided between the stator core and the first inner ring portion.

[0008] Preferably, the motor stator cooling structure further includes a sealing wedge, the sealing wedge is adapted to be installed inside the slot, and a male mating structure is provided at an end of the sealing wedge, and a female mating structure is provided at a portion of the protruding tooth inserted into the slot, and the male mating structure is adapted to be connected to the female mating structure.

[0009] Preferably, a first mating structure is provided at one end of the sealing ring facing away from the stator core, a second mating structure matching the first mating structure is provided on the first inner ring portion, and the second mating structure is connected to the first mating structure.

[0010] Preferably, the motor stator cooling structure further includes a first sealing ring, and the first sealing ring is provided at a connection point between the first mating structure and the second mating structure.

[0011] Preferably, the motor stator cooling structure further includes a second sealing ring, an attachment groove is provided in the first outer ring portion, and an open end of the attachment groove is used to abut against the end face of the stator core, and the second sealing ring is provided in the attachment groove.

[0012] Preferably, an oil supply groove is provided on one side of the first outer ring portion facing the first inner ring portion, the oil supply hole is provided on the first outer ring portion, and the oil supply hole is in communication with the oil supply groove.

[0013] The present invention further provides an electric motor, comprising: an electric motor housing; and the above-mentioned electric motor stator cooling structure, wherein a first sealing oil cover of the electric motor stator cooling structure is provided within the electric motor housing; an oil supply port is provided in the electric motor housing; the first sealing oil cover and a side wall of the electric motor housing surround an oil supply cavity structure; and the oil supply port communicates with the oil supply cavity structure.

[0014] The electric motor of the present invention has the same beneficial effects as the electric motor stator cooling structure, and the description thereof will be omitted here.

[0015] Preferably, the second sealing oil cover of the motor stator cooling structure is provided within the motor housing, the motor housing is provided with an oil discharge cavity structure, the oil discharge hole of the second sealing oil cover is connected to the oil discharge cavity structure, the motor housing is provided with an oil discharge port, and the oil discharge port is connected to the oil discharge cavity structure. [Brief explanation of the drawings]

[0016] [Figure 1]1 is a schematic diagram of the internal structure of a motor stator cooling structure according to an embodiment of the present invention; [Figure 2] FIG. 2 is a partially enlarged schematic view of FIG. [Figure 3] FIG. 2 is a structural schematic diagram of a first sealing oil cover according to an embodiment of the present invention. [Figure 4] FIG. 4 is a structural schematic diagram of a second sealing oil cover according to an embodiment of the present invention. [Figure 5] 2 is a structural schematic diagram of a sealing ring according to an embodiment of the present invention; [Figure 6] 1 is a structural schematic diagram of a sealing wedge according to an embodiment of the present invention; [Figure 7] 2 is a partially enlarged schematic view of a stator core according to an embodiment of the present invention. FIG. [Figure 8] 2 is a structural schematic diagram of a stator winding and a stator core according to an embodiment of the present invention; FIG. DETAILED DESCRIPTION OF THE INVENTION

[0017] In order to make the above objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0018] It should be noted that the terms "first," "second," etc. in the present specification and claims, as well as in the drawings, are used to distinguish between similar objects and are not necessarily used to describe a particular order or sequence. It should be understood that the data so used may be interchangeable where appropriate, such that the embodiments of the present invention described herein may be practiced in orders other than those illustrated or described herein.

[0019] As shown in Figures 1, 3, 4 and 8, an electric motor stator cooling structure according to an embodiment of the present invention includes a first sealing oil cover 1 and a second sealing oil cover 2, wherein the first sealing oil cover 1 is provided with an oil supply hole 3 and the second sealing oil cover 2 is provided with an oil discharge hole 4, the first sealing oil cover 1 and the second sealing oil cover 2 are used to cover two opposite ends of a stator winding 5, respectively, such that the first sealing oil cover 1 and one end face of the stator core 6 surround a first cavity structure 7, which is in communication with the oil supply hole 3, and the second sealing oil cover 2 and the other end face of the stator core 6 surround a second cavity structure 8, which is in communication with the oil discharge hole 4, a cooling oil passage 9 is provided inside the stator core 6, and the cooling oil passage 9 is in communication with the first cavity structure 7 and the second cavity structure 8.

[0020] Specifically, the motor stator cooling structure may include a first sealing oil cover 1 and a second sealing oil cover 2, the first sealing oil cover 1 may be provided with an oil supply hole 3, and the second sealing oil cover 2 may be provided with an oil discharge hole 4. In this embodiment, the first sealing oil cover 1 may cover one end of the stator winding 5, i.e., one end of the stator winding 5 is located within the first sealing oil cover 1, so that the first sealing oil cover 1 and one end face of the stator core 6 surround a first cavity structure 7, and one end of the stator winding 5 is located within the first cavity structure 7, and the oil supply hole 3 may communicate with the first cavity structure 7.

[0021] Similarly, the second sealing oil cover 2 may cover the other end of the stator winding 5, i.e., the other end of the stator winding 5 may be located within the second sealing oil cover 2, so that the second sealing oil cover 2 and the other end face of the stator core 6 surround the second cavity structure 8, and the other end of the stator winding 5 may be located within the second cavity structure 8, and the oil discharge hole 4 may communicate with the second cavity structure 8. A cooling oil passage 9 may be provided inside the stator core 6, and in this embodiment, a plurality of cooling oil passages 9 are provided in the stator core 6, and the plurality of cooling oil passages 9 are provided at intervals along the circumferential direction of the stator core 6, and the cooling oil passages 9 extend along the axial direction of the stator core 6, and the cooling oil passages 9 may communicate with the first cavity structure 7 and the second cavity structure 8.

[0022] When the motor needs to be cooled, the cooling oil can flow into the first cavity structure 7 through the oil supply hole 3, then into the stator core 6 through the cooling oil passage 9, and then into the second cavity structure 8 along the cooling oil passage 9. Thus, the cooling oil can pass through the leading end of the stator winding 5, the stator core 6, and the trailing end of the stator winding 5, before flowing out through the oil discharge hole 4. Furthermore, the entire stator module can come into contact with the cooling oil, that is, the entire stator module can be effectively cooled by heat exchange, and the stator module can be cooled uniformly.

[0023] As shown in FIGS. 1, 3 and 4, in some embodiments, the first sealing oil cover 1 includes a first oil cover body 101, a first inner ring portion 102 and a first outer ring portion 103, the first inner ring portion 102 and the first outer ring portion 103 are respectively connected to the first oil cover body 101, and the first inner ring portion 102, the first outer ring portion 103 and the first oil cover body 101 form a first annular groove structure 104, an open end of the first annular groove structure 104 is used to abut against an end face of the stator core 6, thereby The second sealing oil cover 2 includes a second oil cover body 201, a second inner ring portion 202, and a second outer ring portion 203, the second inner ring portion 202 and the second outer ring portion 203 are respectively connected to the second oil cover body 201, and the second inner ring portion 202, the second outer ring portion 203, and the second oil cover body 201 form a second annular groove structure, an open end of which is used to abut against the end face of the stator core 6, thereby surrounding the second cavity structure 8.

[0024] Specifically, the first sealed oil cover 1 may include a first oil cover body 101, a first inner ring portion 102, and a first outer ring portion 103, the first oil cover body 101 having an annular shape, the first inner ring portion 102 may be connected to the inner ring edge of the first oil cover body 101, the first outer ring portion 103 may be connected to the outer ring edge of the first oil cover body 101, and the first inner ring portion 102 and the first outer ring portion 103 are all located on the same side of the first oil cover body 101, so that the first oil cover body 101, the first inner ring portion 102, and the first outer ring portion 103 can form a first annular groove structure 104, and an oil supply hole 3 is provided in the first outer ring portion 103, and multiple oil supply holes 3 may be provided at intervals along the circumferential direction of the first outer ring portion 103.

[0025] The first annular groove structure 104 may match the annular structure formed by the end coils of the stator winding 5, so that the first annular groove structure 104 may cover one end of the stator winding 5 and encase the end coils of the stator winding 5, and the open end of the first annular groove structure 104 may abut against the end face of the stator core 6. In this embodiment, one end of the first outer ring portion 103 away from the first oil cover body 101 abuts against the end face of the stator core 6, and one end of the first inner ring portion 102 away from the first oil cover body 101 is connected to the stator core 6 via a sealant to form a sealing structure, thereby surrounding the first cavity structure 7, and cooling oil can flow through the first annular groove structure 104 to cool one end of the stator winding 5.

[0026] In some embodiments, a locking structure can be provided at one end of the first outer ring portion 103 away from the first oil cover body 101, the locking structure including multiple locks spaced apart along the circumferential direction of the first outer ring portion 103, and a locking groove structure can be provided on the stator core 6, and when the first outer ring portion 103 abuts against the stator core 6, the locking structure can be inserted into the locking groove structure, thereby more firmly connecting the first outer ring portion 103 and the stator core 6.

[0027] Similarly, the second sealing oil cover 2 may include a second oil cover body 201, a second inner ring portion 202, and a second outer ring portion 203. The second oil cover body 201 has an annular shape. The second inner ring portion 202 may be connected to the inner ring edge of the second oil cover body 201, and the second outer ring portion 203 may be connected to the outer ring edge of the second oil cover body 201, and the second inner ring portion 202 and the second outer ring portion 203 are all located on the same side of the second oil cover body 201, so that the second oil cover body 201, the second inner ring portion 202, and the second outer ring portion 203 can form a second annular groove structure. An oil discharge hole 4 may be provided in the second oil cover body 201, and multiple oil discharge holes 4 may be provided at intervals along the circumferential direction of the second oil cover body 201.

[0028] The second annular groove structure may cover the other end of the stator winding 5 and enclose the end coil of the stator winding 5, and the open end of the second annular groove structure may abut against the end face of the stator core 6. In this embodiment, one end of the second outer ring portion 203 away from the second oil cover body 201 abuts against the end face of the stator core 6, and one end of the second inner ring portion 202 away from the second oil cover body 201 is connected to the stator core 6 via a sealant to form a sealing structure, thereby enclosing the second cavity structure 8, and cooling oil can flow through the second annular groove structure to cool the other end of the stator winding 5.

[0029] As shown in Figures 2, 5 and 7, in some embodiments, the motor stator cooling structure further includes a sealing ring 10, which is attached to the end face of the stator core 6, and has a plurality of protruding teeth 11 spaced apart at one end of the sealing ring 10 facing the stator core 6, the protruding teeth 11 being used to be inserted into a plurality of slots 12 of the stator core 6 in a one-to-one correspondence, and the sealing ring 10 being arranged between the stator core 6 and the first inner ring portion 102.

[0030] Specifically, the motor stator cooling structure may further include a sealing ring 10, which may be attached to the end face of the stator core 6, and a plurality of protruding teeth 11 may be provided at intervals on one end of the sealing ring 10 facing the stator core 6. In this embodiment, a plurality of slots 12 may be provided on the end face of the stator core 6, and the plurality of slots 12 may be provided at uniform intervals along the circumferential direction of the stator core 6, and the plurality of protruding teeth 11 are inserted into the plurality of slots 12 of the stator core 6 in a one-to-one correspondence, thereby firmly attaching the sealing ring 10 to the end face of the stator core 6. In addition, the sealing ring 10 may be provided between the stator core 6 and the first inner ring portion 102, and the sealing ring 10 can form a sealing structure between the stator core 6 and the first inner ring portion 102, thereby increasing the sealing ability of the first cavity structure 7 and preventing cooling oil from leaking between the first inner ring portion 102 and the stator core 6.

[0031] In another embodiment, a sealing ring 10 may be provided between the stator core 6 and the second inner ring portion 202, and the sealing ring 10 can increase the sealing property of the second cavity structure 8.

[0032] As shown in Figures 2, 5 and 6, in some embodiments, the motor stator cooling structure further includes a sealing wedge 13, which is used to be installed inside the slot 12, and has a male mating structure 131 at the end of the sealing wedge 13, and a female mating structure 111 at the portion of the protruding tooth 11 inserted into the slot 12, and the male mating structure 131 is used to be connected to the female mating structure 111.

[0033] Specifically, the motor stator cooling structure may further include a sealing wedge 13. In this embodiment, a plurality of sealing wedges 13 may be provided, and the plurality of sealing wedges 13 may be provided in a one-to-one correspondence within the plurality of slots 12. The sealing wedges 13 may have male mating structures 131 at their ends, and the protruding teeth 11 may have female mating structures 111 at their portions inserted into the slots 12, and the male mating structures 131 may be matched and connected to the female mating structures 111. In another embodiment, the sealing wedges 13 may have female mating structures 111 at their ends, and the protruding teeth 11 may have male mating structures 131 at their portions inserted into the slots 12.

[0034] The sealing wedge 13 itself has the effect of increasing the sealing property, thereby preventing the cooling oil from leaking from the slot 12, and the sealing wedge 13 and the protruding tooth 11, through the matching connection of the male mating structure 131 and the female mating structure 111, can further increase the sealing property, thereby preventing the cooling oil from leaking from the slot 12.

[0035] Preferably, insulating paint can be dripped into the slots 12, and the insulating paint can be used to fill the gaps between the sealing wedges 13, the protruding teeth 11 of the sealing ring 10, and the stator core 6, thereby forming a sealed whole inside the stator core 6 and effectively preventing leakage of cooling oil.

[0036] As shown in Figures 2 and 3, in some embodiments, a first mating structure 14 is provided at one end of the sealing ring 10 facing away from the stator core 6, a second mating structure 15 that matches the first mating structure 14 is provided on the first inner ring portion 102, and the second mating structure 15 is connected to the first mating structure 14.

[0037] Specifically, a first mating structure 14 may be provided at one end of the sealing ring 10 facing away from the stator core 6, and the first mating structure 14 is provided around the sealing ring 10 in the circumferential direction, and a second mating structure 15 matching the first mating structure 14 may be provided at one end of the first inner ring portion 102 facing the stator core 6, and the second mating structure 15 is similarly provided around the first inner ring portion 102 in the circumferential direction.

[0038] In this embodiment, one end of the first inner ring portion 102 close to the stator core 6 is recessed in a direction away from the first outer ring portion 103 to form a second mating structure 15, and the first mating structure 14 can engage with the second mating structure 15, and one end of the first mating structure 14 may abut against the first inner ring portion 102, thereby connecting the second mating structure 15 to the first mating structure 14, and the provision of the first mating structure 14 and the second mating structure 15 can further increase the sealing ability of the first cavity structure 7.

[0039] As shown in FIG. 2, in some embodiments, the motor stator cooling structure further includes a first sealing ring 16, which is provided at the connection point between the first mating structure 14 and the second mating structure 15.

[0040] Specifically, the motor stator cooling structure may further include a first sealing ring 16, which may be provided at the connection point between the first mating structure 14 and the second mating structure 15. In this embodiment, the second mating structure 15 is formed recessed from one end of the first inner ring portion 102 in a direction away from the first outer ring portion 103, and the distance between the second mating structure 15 and the first outer ring portion 103 is greater than the radial dimension of the stator core 6. When the first sealing oil cover 1 covers the stator winding 5, the end face 102 of the first inner ring portion is in a suspended state, that is, the end face of the second mating structure 15 is in a suspended state.

[0041] In this embodiment, the first sealing ring 16 can be interposed between the first mating structure 14 and the second mating structure 15; more specifically, the first sealing ring 16 is disposed between the side wall of the first mating structure 14 and the side wall of the second mating structure 15, thereby increasing the sealing ability of the connection point between the first mating structure 14 and the second mating structure 15 and further preventing leakage of cooling oil.

[0042] Preferably, a groove structure may be provided on the side wall of the first mating structure 14, and a protrusion structure may be provided on the side of the first sealing ring 16 facing the first mating structure 14, and the protrusion structure may be inserted into the groove structure, so that the first sealing ring 16 can be more firmly attached at the connection point between the first mating structure 14 and the second mating structure 15.

[0043] As shown in Figures 1 and 2, in some embodiments, the motor stator cooling structure further includes a second sealing ring 17, a mounting groove 1031 is provided in the first outer ring portion 103, and the open end of the mounting groove 1031 is used to abut against the end face of the stator core 6, and the second sealing ring 17 is provided in the mounting groove 1031.

[0044] Specifically, the motor stator cooling structure may further include a second sealing ring 17, and an attachment groove 1031 may be provided at one end of the first outer ring portion 103 facing the stator core 6, and the open end of the attachment groove 1031 may abut against the end face of the stator core 6, and the second sealing ring 17 may be provided in the attachment groove 1031, so that the second sealing ring 17 can increase the sealing performance between the first outer ring portion 103 and the end face of the stator core 6 and prevent cooling oil from leaking between the first outer ring portion 103 and the stator core 6.

[0045] As shown in Figures 1 to 3, in some embodiments, an oil supply groove 19 is provided on one side of the first outer ring portion 103 facing away from the first inner ring portion 102, the oil supply hole 3 is provided in the first outer ring portion 103, and the oil supply hole 3 is connected to the oil supply groove 19.

[0046] Specifically, an oil supply groove 19 may be provided on one side of the first outer ring portion 103 facing away from the first inner ring portion 102, and the oil supply groove 19 may be recessed from the first outer ring portion 103 toward the first inner ring portion 102, and the oil supply groove 19 may extend along the circumferential direction of the first outer ring portion 103. An oil supply hole 3 may be provided in the first outer ring portion 103, and the oil supply hole 3 may be connected to the oil supply groove 19. More specifically, the oil supply hole 3 may be provided at the bottom of the oil supply groove 19, and the cooling oil first enters the oil supply groove 19 and then flows into the first cavity structure 7 from the oil supply hole 3, allowing the cooling oil to flow uniformly into the first cavity structure 7.

[0047] As shown in Figures 1 to 3, another embodiment of the present invention further provides an electric motor, which includes an electric motor housing 20 and the above-mentioned electric motor stator cooling structure, wherein a first sealing oil cover 1 of the electric motor stator cooling structure is provided in the electric motor housing 20, an oil supply port 21 is provided in the electric motor housing 20, the first sealing oil cover 1 and a side wall of the electric motor housing 20 surround an oil supply cavity structure 22, and the oil supply port 21 communicates with the oil supply cavity structure 22.

[0048] Specifically, the electric motor may include an electric motor housing 20 and an electric motor stator cooling structure, a first sealed oil cover 1 of the electric motor stator cooling structure may be provided inside the electric motor housing 20, an oil supply port 21 may be provided in the electric motor housing 20, an oil supply groove 19 may be provided in the first sealed oil cover 1, and the open end of the oil supply groove 19 may abut against a side wall of the electric motor housing 20, so that the oil supply groove 19 can surround the side wall of the electric motor housing 20 and the oil supply cavity structure 22, and the oil supply port 21 can communicate with the oil supply cavity structure 22.

[0049] When the motor needs to be cooled, cooling oil can be pumped through an oil pump into the oil supply port 21 on the motor housing 20, and the cooling oil flows from the oil supply port 21 into the oil supply cavity structure 22. The cooling oil then flows through the oil supply hole 3 into the first cavity structure 7 to cool one end of the stator winding 5, and then through the cooling oil passage 9 inside the stator core 6 to perform heat exchange and dissipation for the stator core 6. Finally, the cooling oil flows into the second cavity structure 8 to cool the other end of the stator winding 5, and then flows out of the oil discharge hole 4. This process is repeated to efficiently dissipate heat for the entire stator module.

[0050] As shown in FIG. 1 , in some embodiments, the second sealing oil cover 2 of the motor stator cooling structure is disposed in the motor housing 20, the motor housing 20 is provided with an oil discharge cavity structure 23, the oil discharge hole 4 of the second sealing oil cover 2 communicates with the oil discharge cavity structure 23, the motor housing 20 is provided with an oil discharge port 24, and the oil discharge port 24 communicates with the oil discharge cavity structure 23.

[0051] Specifically, the second sealing oil cover 2 of the motor stator cooling structure may be disposed inside the motor housing 20, and the motor housing 20 may further be provided with an oil discharge cavity structure 23. The oil discharge holes 4 on the second sealing oil cover 2 may be connected to the oil discharge cavity structure 23. The motor housing 20 may further be provided with an oil discharge port 24, and the oil discharge port 24 may be connected to the oil discharge cavity structure 23. The cooling oil may be collected in the oil discharge cavity structure 23 after flowing out of the second cavity structure 8, and the cooling oil may be uniformly discharged from the oil discharge port 24, making it easy to collect the cooling oil. After the cooling oil is processed, it can enter the next cooling cycle, thereby increasing the cooling efficiency.

[0052] In some embodiments, a second sealing groove may be provided on the side of the second outer ring portion 203 of the second sealing oil cover 2, with the open end of the second sealing groove facing toward the motor housing 20 and abutting against the side wall of the motor housing 20. A third sealing ring may be further provided in the motor stator cooling structure, and the third sealing ring may be provided in the second sealing groove, which can increase the sealing performance between the second outer ring portion 203 and the motor housing 20.

[0053] Similarly, a first sealing groove may be provided on the side surface of the first outer ring portion 103 of the first sealing oil cover 1, and the opening end of the first sealing groove may be provided toward the direction of the motor housing 20, and the opening end of the first sealing groove may also abut against the side wall of the motor housing 20. A third sealing ring may be provided in the first sealing groove, which can increase the sealing performance between the first outer ring portion 103 and the motor housing 20.

[0054] Although the present invention has been disclosed as above, the scope of protection disclosed by the present invention is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all of these changes and modifications are included in the scope of protection of the present invention. [Explanation of symbols]

[0055] 1 First sealing oil cover 101 First oil cover body 102 First inner ring 103 First outer ring 1031 Mounting groove 104 First annular groove structure 2 Second sealing oil cover 201 Second oil cover body 202 Second inner ring 203 Second outer ring 3 Oil supply hole 4 Oil drain hole 5 Stator Winding 6 Stator core 7 First cavity structure 8 Second cavity structure 9 Cooling oil path 10 Sealing ring 11 Protruding teeth 111 Female fitting structure 12 slots 13 Sealing wedge 131 Male mating structure 14 First fitting structure 15 Second fitting structure 16 First sealing ring 17 Second sealing ring 19 Oil supply groove 20 Motor housing 21 Oil supply port 22 Oil supply cavity structure 23 Oil discharge cavity structure 24 Oil outlet

Claims

1. The stator cooling structure for an electric motor includes a first sealing oil cover (1) and a second sealing oil cover (2), the first sealing oil cover (1) is provided with an oil supply hole (3), the second sealing oil cover (2) is provided with an oil discharge hole (4), and the first sealing oil cover (1) and the second sealing oil cover (2) are used to cover two opposing ends of a stator winding (5), respectively, so that the first sealing oil cover (1) and one end face of a stator core (6) are in contact with the first sealing oil cover (1). a cooling oil passage (9) provided inside the stator core (6), the cooling oil passage (9) communicating with the first cavity structure (7) and the second cavity structure (7) communicating with the oil supply hole (3); the second sealing oil cover (2) and another end face of the stator core (6) surrounding a second cavity structure (8), the second cavity structure (8) communicating with the oil discharge hole (4);

2. The first sealing oil cover (1) includes a first oil cover body (101), a first inner ring portion (102) and a first outer ring portion (103), the first inner ring portion (102) and the first outer ring portion (103) are respectively connected to the first oil cover body (101), and the first inner ring portion (102), the first outer ring portion (103) and the first oil cover body (101) form a first annular groove structure (104), an open end of the first annular groove structure (104) is used to abut against an end face of the stator core (6), thereby surrounding the first cavity structure (7), and the second sealing oil cover (1) is 2. The electric motor stator cooling structure according to claim 1, wherein the oil cover (2) includes a second oil cover body (201), a second inner ring portion (202), and a second outer ring portion (203), the second inner ring portion (202) and the second outer ring portion (203) are respectively connected to the second oil cover body (201), and the second inner ring portion (202), the second outer ring portion (203), and the second oil cover body (201) form a second annular groove structure, an open end of which is used to abut against an end face of the stator core (6), thereby surrounding the second cavity structure (8).

3. 3. The electric motor stator cooling structure according to claim 2, further comprising a sealing ring (10), the sealing ring (10) being attached to an end face of the stator core (6), the sealing ring (10) having a plurality of protruding teeth (11) spaced apart at one end facing the stator core (6), the plurality of protruding teeth (11) being used to be inserted into a plurality of slots (12) of the stator core (6) in a one-to-one correspondence, and the sealing ring (10) being provided between the stator core (6) and the first inner ring portion (102).

4. 4. The electric motor stator cooling structure according to claim 3, further comprising a sealing wedge (13), the sealing wedge (13) being adapted to be installed inside the slot (12), and having a male mating structure (131) at an end of the sealing wedge (13), and a female mating structure (111) at a portion of the protruding tooth (11) inserted into the slot (12), the male mating structure (131) being adapted to be connected to the female mating structure (111).

5. 4. The electric motor stator cooling structure according to claim 3, wherein a first mating structure (14) is provided at one end of the sealing ring (10) facing away from the stator core (6), a second mating structure (15) matching the first mating structure (14) is provided at the first inner ring portion (102), and the second mating structure (15) is connected to the first mating structure (14).

6. 6. The electric motor stator cooling structure according to claim 5, further comprising a first sealing ring (16), the first sealing ring (16) being provided at a connection point between the first mating structure (14) and the second mating structure (15).

7. 3. The electric motor stator cooling structure according to claim 2, further comprising a second sealing ring (17), wherein the first outer ring portion (103) is provided with an attachment groove (1031), and an open end of the attachment groove (1031) is used to abut against an end face of the stator core (6), and the second sealing ring (17) is provided in the attachment groove (1031).

8. 3. The electric motor stator cooling structure according to claim 2, wherein an oil supply groove (19) is provided on one side of the first outer ring portion (103) facing away from the first inner ring portion (102), the oil supply hole (3) is provided in the first outer ring portion (103), and the oil supply hole (3) is connected to the oil supply groove (19).

9. An electric motor comprising: an electric motor housing (20); and the electric motor stator cooling structure according to any one of claims 1 to 8, wherein a first sealed oil cover (1) of the electric motor stator cooling structure is provided within the electric motor housing (20), an oil supply port (21) is provided in the electric motor housing (20), side walls of the first sealed oil cover (1) and the electric motor housing (20) surround an oil supply cavity structure (22), and the oil supply port (21) communicates with the oil supply cavity structure (22).

10. 10. The electric motor according to claim 9, wherein the second sealing oil cover (2) of the electric motor stator cooling structure is provided in the electric motor housing (20), the electric motor housing (20) is provided with an oil discharge cavity structure (23), the oil discharge hole (4) of the second sealing oil cover (2) is in communication with the oil discharge cavity structure (23), the electric motor housing (20) is provided with an oil discharge port (24), and the oil discharge port (24) is in communication with the oil discharge cavity structure (23).

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