An oil-immersed structure motor

Abstract

The application discloses an immersed oil-cooling structure motor, and relates to the technical field of motors, which comprises a shell, a stator core and a winding, one end of the shell is provided with an oil inlet, the other end of the shell is provided with an oil outlet, a cover is connected to the side of the shell close to the oil inlet, stator cover plates are arranged on the two sides of the stator core, sealing assemblies are arranged between the stator cover plates, the cover and the shell, and the oil inlet, the cover, the shell, the stator cover plates and the sealing assemblies enclose an oil inlet cavity on one side of the stator core. The oil inlet cavity and the oil outlet cavity are formed at the two ends of the stator through the shell, the cover and the sealing structure, the cooling oil can completely immerse the end winding and directly flow in the stator slot, the problem that the cooling oil cannot enter the stator slot in the traditional spraying mode is solved, the local high temperature of the straight section of the winding is eliminated, and the overall heat dissipation uniformity of the motor is improved.

Description

Technical Field

[0001] This application relates to the field of motor technology, and in particular to a submerged oil-cooled motor. Background Technology

[0002] As the power density of motors continues to increase, the heat generated during operation increases significantly, and the requirements for the heat dissipation system also increase. Currently, motors usually use the traditional spray method for liquid cooling. In the spray cooling structure, the cooling medium is mainly sprayed and acts on the surface of the winding ends. Due to structural limitations, the cooling oil is difficult to enter the stator slots, resulting in the lack of direct contact between the straight sections of the windings in the stator slots and the cooling medium. Heat cannot be carried away in time, which easily leads to local high temperature phenomena, thus limiting the overall heat dissipation uniformity of the motor.

[0003] In existing partial chamber cooling schemes, when the cooling fluid passes through the motor and reaches the oil outlet side, due to the lack of fluid guidance, the cooling medium tends to accumulate irregularly after entering the closed cavity on the oil outlet side. The fluid forms a flow dead zone inside this closed structure, causing the flow rate of the cooling medium to decrease or even stagnate. This prevents the formation of rapid hot and cold medium exchange around the non-outlet end of the winding on the oil outlet side, limiting the heat exchange efficiency of the end winding in this area.

[0004] Furthermore, in order to form cooling oil channels inside the stator, the existing structural design increases the complexity of manufacturing and assembly. In order to form axial channels, it is often necessary to use stator laminations with different opening features to be stacked in an alternating manner, or to perform additional mechanical drilling after the stator core is formed, which leads to cumbersome manufacturing processes. When adding cover plates or seals to separate oil chambers at the stator ends, the radial extension dimension can easily squeeze the effective space inside the motor. During subsequent rotor assembly or motor operation, there is a risk of mechanical interference with the rotor, reducing the assembly reliability and safety of the whole machine. Summary of the Invention

[0005] The purpose of this invention is to provide an immersion oil-cooled motor, which at least solves one of the technical problems in traditional cooling methods, such as the inability of cooling oil to enter the stator slots, resulting in local high temperatures in the straight section of the winding, the formation of a flow dead zone on the oil outlet side that reduces heat exchange efficiency, and the cumbersome manufacturing process of the oil circuit structure and the ease with which end components can interfere with the rotor during assembly.

[0006] This invention provides the following solution:

[0007] According to one aspect of the present invention, an immersion oil-cooled structure motor is provided, comprising a housing, a stator core and windings, wherein an oil inlet is provided at one end of the housing and an oil outlet is provided at the other end of the housing, an end cap is connected to the side of the housing near the oil inlet, stator cover plates are provided on both sides of the stator core, and a sealing assembly is provided between the stator cover plates, the end caps and the housing;

[0008] The oil inlet, the end cap, the housing, the stator cover plate, and the sealing assembly form an oil inlet cavity on one side of the stator core, and the oil outlet, the housing, the stator cover plate, and the sealing assembly form an oil outlet cavity on the other side of the stator core. The stator core and the stator cover plate have through axial cooling channels to connect the oil inlet cavity and the oil outlet cavity.

[0009] Furthermore, the stator core is disposed on the inner wall of the housing, and the winding passes through the stator slot of the stator core. The winding includes a lead-out end extending to both sides, a non-lead-out end, and a straight section inside the stator slot. The lead-out end is exposed in the oil inlet cavity, and the non-lead-out end is exposed in the oil outlet cavity.

[0010] Furthermore, the stator core and the stator cover plate are provided with a through axial cooling channel. The through axial cooling channel includes a first axial cooling channel and a second axial cooling channel. The first axial cooling channel is formed by openings in the stator slot of the stator core and the corresponding position of the stator cover plate. The second axial cooling channel is formed by openings in the bottom of the slot, the tooth or the yoke of the stator core and the corresponding position of the stator cover plate. The first axial cooling channel is directly exposed on the outside of the straight section at the stator slot.

[0011] Furthermore, the stator cover plate includes a first cover plate and a second cover plate, the first cover plate being attached to the oil inlet side of the stator core, and the second cover plate being attached to the oil outlet side.

[0012] Furthermore, the sealing assembly includes a first sealing structure and a second sealing structure. The first sealing structure is disposed between the end cap and the first cover plate. The oil inlet chamber is jointly enclosed by the oil inlet, the end cap, the housing, the first cover plate, and the first sealing structure. The second sealing structure is disposed between the housing and the second cover plate. The oil outlet chamber is jointly enclosed by the oil outlet, the housing, the second cover plate, and the second sealing structure.

[0013] Furthermore, the oil outlet is located at the top of the periphery of the housing, and the bottom edge height of the oil outlet is greater than or equal to the maximum outer diameter of the winding end.

[0014] Furthermore, the second sealing structure plate has multiple through-holes, which are arranged in a ring array inside the second sealing structure and communicate with the inside of the oil outlet cavity.

[0015] Furthermore, the first sealing structure has protrusions on both sides facing the end cap and the first cover plate. The first sealing structure is fixed inside the end cap and the first cover plate by the protrusions on both sides. A sealing ring is provided between the first sealing structure and the end cap or the first cover plate. The second sealing structure also has protrusions on both sides facing the housing and the second cover plate. The second sealing structure is fixed inside the end cap and the first cover plate by the protrusions on both sides. A sealing ring is provided between the second sealing structure and the end cap or the first cover plate.

[0016] Furthermore, both the first cover plate and the second cover plate have stepped cross sections, and both the first cover plate and the second cover plate have clearance through holes adapted to the positions and diameters of the first axial cooling channel and the second axial cooling channel. The inner diameter of the first cover plate is greater than or equal to the inner diameter of the stator core.

[0017] Furthermore, the first axial cooling channels are arranged in a ring array inside the stator core, and the number of the first axial cooling channels is the same as the number of stator slots. The number of the second axial cooling channels opened at the bottom of the stator slots is also the same as the number of stator slots. The second axial cooling channels opened at the teeth or yoke are arranged in a ring array on the cross-section of the stator core.

[0018] The above solution achieves the following beneficial technical effects:

[0019] This application forms an oil inlet chamber and an oil outlet chamber at both ends of the stator through a shell, cover plate and sealing structure. The first and second axial cooling channels connecting the two chambers are formed by the openings in the stator slots and inside the core. An oil outlet higher than the end winding is provided so that the cooling oil can completely immerse the end winding and flow directly into the stator slot. This solves the problem that the cooling oil cannot enter the stator slot in the traditional spray method, eliminates the local high temperature in the straight section of the winding, and improves the overall heat dissipation uniformity of the motor.

[0020] This application provides multiple axial guide holes evenly arranged along the circumference on the second sealing structure on the oil outlet side. When cooling oil flows into the oil outlet chamber, the guide holes can effectively guide the fluid, preventing the cooling oil from forming a flow dead zone inside the end cover, enhancing the flow of the cooling medium at the non-outlet end of the winding, thereby improving the heat exchange efficiency of the winding on the oil outlet side.

[0021] The oil circuit structure design of this application takes into account the convenience of production and assembly. The stator core only needs to use the same stator lamination to stamp the required axial cooling channel, which simplifies the manufacturing process. At the same time, the inner diameter of the first cover plate is designed to be greater than or equal to the inner diameter of the stator core. Under the premise of ensuring the sealing and isolation function of the oil inlet cavity, spatial interference with the motor rotor during the assembly process is avoided, thus ensuring the reliability of the whole machine assembly. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the stator assembly structure of the present invention.

[0023] Figure 2 This is a schematic diagram of the liquid flow direction in a half-section of the stator assembly immersed in the oil passage of the present invention.

[0024] Figure 3 This is an exploded structural diagram of the motor portion of the present invention.

[0025] Figure 4 This is a schematic diagram of the half-section planar structure of the stator assembly of the present invention.

[0026] Figure 5 This is the invention Figure 4 A magnified schematic diagram of the structure at point A in the middle.

[0027] Figure 6 This is the invention Figure 4 A magnified schematic diagram of the structure at point B in the middle.

[0028] Figure 7 This is a schematic diagram of the first cover plate and stator core structure of the present invention.

[0029] Figure 8 This is the invention Figure 7 A magnified schematic diagram of the structure at point C.

[0030] Figure 9 This is a schematic diagram of the second cover plate and stator core structure of the present invention.

[0031] Figure 10 This is the invention Figure 9 A magnified schematic diagram of the structure at point D.

[0032] Figure 11 This is a schematic diagram of the first stator axial cooling oil circuit structure of the present invention.

[0033] Figure 12 This is the invention Figure 11 A magnified schematic diagram of the structure at point E in the middle.

[0034] Figure 13 This is a schematic diagram of the second stator axial cooling oil circuit structure of the present invention.

[0035] Figure 14 This is the invention Figure 13 A magnified schematic diagram of the structure at point F in the middle.

[0036] Figure 15 This is a schematic diagram of the third type of stator axial cooling oil circuit structure of the present invention.

[0037] Figure 16 This is the invention Figure 15 A magnified schematic diagram of the structure at point G in the middle.

[0038] Figure 17 This is a schematic diagram of the first type of second sealing structure of the present invention.

[0039] Figure 18 This is the invention Figure 17 A magnified schematic diagram of the structure at point H in the middle.

[0040] Figure 19 This is a schematic diagram of the second sealing structure of the present invention.

[0041] Figure 20 This is the invention Figure 19 A magnified schematic diagram of the structure at point I in the middle.

[0042] Among them, 1. End cap; 2. Housing; 21. Oil inlet; 22. Oil outlet; 23. Oil inlet chamber; 24. Oil outlet chamber; 3. Stator core; 31. First axial cooling channel; 32. Second axial cooling channel; 4. Winding; 41. Outgoing end; 42. Non-outgoing end; 43. Straight section; 6. Stator cover plate; 61. First cover plate; 62. Second cover plate; 7. Sealing assembly; 71. First sealing structure; 72. Second sealing structure; 721. Oil guide hole. Detailed Implementation

[0043] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0044] See attached document Figure 1 - Appendix Figure 10 The present invention provides an immersion oil-cooled structure motor, including a housing 2, a stator core 3 and a winding 4. One end of the housing 2 is provided with an oil inlet 21 and the other end of the housing 2 is provided with an oil outlet 22. An end cover 1 is connected to the side of the housing 2 near the oil inlet 21. Stator cover plates 6 are provided on both sides of the stator core 3. A sealing assembly 7 is provided between the stator cover plate 6, the end cover 1 and the housing 2.

[0045] The oil inlet 21, end cap 1, housing 2, stator cover plate 6 and sealing assembly 7 form an oil inlet cavity 23 on one side of the stator core 3, and the oil outlet 22, housing 2, stator cover plate 6 and sealing assembly 7 form an oil outlet cavity 24 on the other side of the stator core 3. A through axial cooling channel is provided inside the stator core 3 and stator cover plate 6 to connect the oil inlet cavity 23 and the oil outlet cavity 24.

[0046] The stator core 3 is disposed on the inner wall of the housing 2, and the winding 4 passes through the stator slot of the stator core 3. The winding 4 includes a lead-out end 41 extending to both sides, a non-lead-out end 42, and a straight section 43 inside the stator slot. The lead-out end 41 is exposed in the oil inlet chamber 23, and the non-lead-out end 42 is exposed in the oil outlet chamber 24.

[0047] The stator core 3 and stator cover plate 6 are provided with a through axial cooling channel. The through axial cooling channel includes a first axial cooling channel 31 and a second axial cooling channel 32. The first axial cooling channel 31 is formed by opening the stator slot of the stator core 3 and the corresponding position of the stator cover plate 6 and connecting them. The second axial cooling channel 32 is formed by opening the bottom of the slot, the tooth or the yoke of the stator core 3 and the corresponding position of the stator cover plate 6 and connecting them. The first axial cooling channel 31 is directly exposed on the outside of the straight section 43 at the stator slot.

[0048] The stator cover plate 6 includes a first cover plate 61 and a second cover plate 62. The first cover plate 61 is attached to the oil inlet 21 side of the stator core 3, and the second cover plate 62 is attached to the oil outlet 22 side.

[0049] Specifically, when the motor is working, the cooling medium is first input through the oil inlet 21 on the housing 2 and flows into the oil inlet cavity 23, which is jointly enclosed by the end cover 1, housing 2, first cover plate 61 and first sealing structure 71. As the fluid is continuously injected, the liquid level in the oil inlet cavity 23 rises until the output end 41 of the winding 4 on that side is completely submerged. Subsequently, under the continuous push of the system pressure, the cooling medium in the oil inlet cavity 23 is guided and pressed into the first axial cooling channel 31 at the stator slot and the second axial cooling channel 32 distributed inside the stator core 3. During the flow process, the cooling medium comes into direct contact with the straight section 43 of the winding 4 and the stator core 3, absorbing and carrying away the heat generated during the electromagnetic conversion process.

[0050] After carrying heat through the stator core 3, the cooling medium gathers and enters the oil outlet chamber 24 on the other side of the motor, simultaneously immersing the non-leading end 42 of the winding 4. Since the oil outlet 22 on the housing 2 is spatially arranged higher than the maximum outer diameter of the end winding 4, the cooling medium cannot flow directly from the bottom. Instead, it must continuously accumulate upwards in the oil outlet chamber 24 until it completely fills the entire chamber and submerges the non-leading end 42 of the winding 4. Only then can it overflow from the higher oil outlet 22 and be discharged from the motor. By utilizing the physical height difference of the oil outlet 22, it is ensured that the winding 4 at both ends of the motor and the interior of the stator core 3 are always kept in a completely submerged cooling state throughout the entire operation.

[0051] See attached document Figure 17 - Appendix Figure 20 The sealing assembly 7 includes a first sealing structure 71 and a second sealing structure 72. The first sealing structure 71 is disposed between the end cap 1 and the first cover plate 61. The oil inlet chamber 23 is jointly enclosed by the oil inlet 21, the end cap 1, the housing 2, the first cover plate 61 and the first sealing structure 71. The second sealing structure 72 is disposed between the housing 2 and the second cover plate 62. The oil outlet chamber 24 is jointly enclosed by the oil outlet 22, the housing 2, the second cover plate 62 and the second sealing structure 72.

[0052] The oil outlet 22 is located on the top of the periphery of the housing 2. The bottom edge height of the oil outlet 22 is greater than or equal to the maximum outer diameter of the end of the winding 4. Multiple through oil guide holes 721 are provided on the surface of the second sealing structure 72. The oil guide holes 721 are arranged in a ring array inside the second sealing structure 72. The oil guide holes 721 communicate with the inside of the oil outlet cavity 24.

[0053] Specifically, when the cooling medium that has absorbed the heat inside the motor gathers in large quantities from the first axial cooling channel 31 and the second axial cooling channel 32 and flows into the oil outlet chamber 24, the axial guide oil hole 721 on the second sealing structure 72 on the oil outlet side begins to play a guiding role. The large amount of fluid entering the oil outlet chamber 24 will first encounter the physical obstruction of the second sealing structure 72. At this time, the fluid that was originally prone to disorderly accumulation in the oil outlet chamber 24 will be orderly dispersed and flow out along the multiple guide oil holes 721 evenly arranged in the circumferential direction on the surface of the second sealing structure 72. This breaks the local stagnation state that the fluid is prone to form in the oil outlet chamber 24, forcing the cooling medium to form a directional flow around the non-outlet end 42 of the winding 4, thereby eliminating the fluid stasis dead zone at the edge or bottom of the chamber, accelerating the alternation frequency of the old cooling medium carrying heat on the end surface of the winding 4 and the new cooling medium that enters later, thus ensuring that this area can always maintain a high heat exchange performance.

[0054] See attached document Figure 11 - Appendix Figure 16The first sealing structure 71 has protrusions on both sides facing the end cover 1 and the first cover plate 61. The first sealing structure 71 is fixed inside the end cover 1 and the first cover plate 61 respectively through the protrusions on both sides. A sealing ring is provided between the first sealing structure 71 and the end cover 1 or the first cover plate 61. The second sealing structure 72 also has protrusions on both sides facing the housing 2 and the second cover plate 62. The second sealing structure 72 is fixed inside the end cover 1 and the first cover plate 61 respectively through the protrusions on both sides. A sealing ring is provided between the second sealing structure 72 and the end cover 1 or the first cover plate 61.

[0055] Both the first cover plate 61 and the second cover plate 62 have stepped cross sections. Both the first cover plate 61 and the second cover plate 62 have clearance through holes that match the positions and diameters of the first axial cooling channels 31 and the second axial cooling channels 32. The inner diameter of the first cover plate 61 is greater than or equal to the inner diameter of the stator core 3. The first axial cooling channels 31 are arranged in a ring array inside the stator core 3. The number of first axial cooling channels 31 is the same as the number of stator slots. The number of second axial cooling channels 32 opened at the bottom of the stator slots is also the same as the number of stator slots. The second axial cooling channels 32 opened at the teeth or yoke are arranged in a ring array on the cross section of the stator core 3.

[0056] Specifically, in the manufacturing and assembly process of the motor, the hole features used to form the first axial cooling channel 31 and the second axial cooling channel 32 are uniformly opened on the same type of stator lamination. In actual production, the internal oil passages penetrating the stator can be naturally formed simply by axially stacking and aligning these same type of stator laminations, avoiding additional mechanical drilling processes on the formed stator core 3, thus simplifying the manufacturing process. When installing the stator cover plate 6 at the stator end, the axial outer diameter of the first cover plate 61 and the second cover plate 62 is limited to be less than or equal to the first... The inner diameter of the axial cooling channel 31 ensures that the cover plate will not physically block the oil inlet after fitting and assembly, ensuring that the cooling medium can enter without obstruction. In order to take into account the operating requirements of the internal moving parts, the inner diameter of the first cover plate 61 is designed to be greater than or equal to the inner diameter of the stator core 3, so that it avoids the air gap position of the motor in the radial extension space. While realizing the sealing and isolation function of the oil inlet chamber 23, it also reserves a safe clearance for the smooth insertion of the rotor and the rotation of the motor during operation, preventing mechanical interference during assembly and operation.

[0057] Working principle: The cooling medium enters through the oil inlet 21 on the housing 2, filling the oil inlet cavity 23 formed by the end cover 1, housing 2, first cover plate 61 and first sealing structure 71. It first completely submerges the output end 41 of the winding 4. Under pressure, the cooling medium in the oil inlet cavity 23 flows into the first axial cooling channel 31 at the stator slot and the second axial cooling channel 32 inside the iron core. During the flow through the stator, it directly absorbs the heat of the straight section 43 of the winding 4 and the heat of the stator iron core 3. After passing through the stator, the cooling medium enters the oil outlet cavity 24 and submerges the non-output end 42 of the winding 4. Since the position of the oil outlet 22 on the housing 2 is structurally higher than the outer diameter of the end winding 4, the cooling medium must continuously accumulate upward in the oil outlet cavity 24 and fill the entire cavity before it can overflow from the oil outlet 22. This physical height difference ensures that the windings 4 at both ends of the motor and the interior of the stator are always in a completely submerged cooling state.

[0058] When the cooling medium flows into the oil outlet chamber 24 in large quantities from the first axial cooling channel 31 and the second axial cooling channel 32, the axial guide oil holes 721 on the second sealing structure 72 begin to guide the flow. After the fluid encounters the obstruction of the second sealing structure 72 in the closed cavity, it flows out dispersed along the evenly arranged guide oil holes 721 around its circumference. This porous guiding design changes the single accumulation and stagnation state of the fluid in the oil outlet chamber 24, forcing the cooling medium to form a continuous directional flow around the non-outlet end 42 of the winding 4, eliminating the dead zone of fluid stillness, accelerating the alternation frequency of the heat-carrying medium and the subsequent cold medium, and maintaining the heat exchange efficiency of the end region.

[0059] During the structural forming and assembly of the motor, the hole features constituting the first axial cooling channel 31 and the second axial cooling channel 32 are uniformly opened on the same type of stator lamination. The through oil passage is naturally formed by the axial stacking of the laminations, without the need for additional mechanical drilling of the stator core 3. When installing the stator cover plate 6, the axial outer diameter of the first cover plate 61 and the second cover plate 62 is limited to be less than or equal to the inner diameter of the first axial cooling channel 31 to ensure that the oil passage inlet is not blocked after installation. At the same time, the inner diameter of the first cover plate 61 is designed to be greater than or equal to the inner diameter of the stator core 3, so that it avoids the air gap position of the motor in the radial space. While completing the sealing and isolation of the oil inlet chamber 23, a safe clearance is reserved for the rotor to enter and rotate subsequently, preventing mechanical interference.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A submerged oil-cooled motor, characterized in that, The device includes a housing (2), a stator core (3), and a winding (4). One end of the housing (2) is provided with an oil inlet (21), and the other end of the housing (2) is provided with an oil outlet (22). An end cap (1) is connected to the side of the housing (2) near the oil inlet (21). Stator cover plates (6) are provided on both sides of the stator core (3). A sealing assembly (7) is provided between the stator cover plate (6), the end cap (1), and the housing (2). The oil inlet (21), the end cap (1), the housing (2), the stator cover plate (6), and the sealing assembly (7) form an oil inlet cavity (23) on one side of the stator core (3), and the oil outlet (22), the housing (2), the stator cover plate (6), and the sealing assembly (7) form an oil outlet cavity (24) on the other side of the stator core (3). The stator core (3) and the stator cover plate (6) have through axial cooling channels to connect the oil inlet cavity (23) and the oil outlet cavity (24).

2. The submerged oil-cooled motor according to claim 1, characterized in that, The stator core (3) is disposed on the inner wall of the housing (2), and the winding (4) is disposed in the stator slot of the stator core (3). The winding (4) includes a lead-out end (41) extending to both sides, a non-lead-out end (42) and a straight section (43) inside the stator slot. The lead-out end (41) is exposed in the oil inlet chamber (23), and the non-lead-out end (42) is exposed in the oil outlet chamber (24).

3. The submerged oil-cooled structure motor according to claim 2, characterized in that, The stator core (3) and the stator cover plate (6) are provided with a through axial cooling channel. The through axial cooling channel includes a first axial cooling channel (31) and a second axial cooling channel (32). The first axial cooling channel (31) is formed by opening a hole in the stator slot of the stator core (3) and the corresponding position of the stator cover plate (6). The second axial cooling channel (32) is formed by opening a hole in the bottom of the slot, the tooth or the yoke of the stator core (3) and the corresponding position of the stator cover plate (6). The first axial cooling channel (31) is directly exposed outside the straight section (43) at the stator slot.

4. The submerged oil-cooled structure motor according to claim 3, characterized in that, The stator cover plate (6) includes a first cover plate (61) and a second cover plate (62). The first cover plate (61) is attached to the side of the oil inlet (21) of the stator core (3), and the second cover plate (62) is attached to the side of the oil outlet (22).

5. The submerged oil-cooled structure motor according to claim 4, characterized in that, The sealing assembly (7) includes a first sealing structure (71) and a second sealing structure (72). The first sealing structure (71) is disposed between the end cap (1) and the first cover plate (61). The oil inlet chamber (23) is jointly enclosed by the oil inlet (21), the end cap (1), the housing (2), the first cover plate (61), and the first sealing structure (71). The second sealing structure (72) is disposed between the housing (2) and the second cover plate (62). The oil outlet chamber (24) is jointly enclosed by the oil outlet (22), the housing (2), the second cover plate (62), and the second sealing structure (72).

6. The submerged oil-cooled structure motor according to claim 4, characterized in that, The oil outlet (22) is located on the top of the periphery of the housing (2), and the bottom edge height of the oil outlet (22) is greater than or equal to the maximum outer diameter of the winding (4) end.

7. A submerged oil-cooled motor according to claim 5, characterized in that, The second sealing structure (72) has multiple through oil guide holes (721) on its plate surface. The oil guide holes (721) are arranged in a ring array inside the second sealing structure (72), and the oil guide holes (721) are connected to the inside of the oil outlet cavity (24).

8. The submerged oil-cooled structure motor according to claim 5, characterized in that, The first sealing structure (71) has protrusions on both sides facing the end cap (1) and the first cover plate (61). The first sealing structure (71) is fixed inside the end cap (1) and the first cover plate (61) respectively by the protrusions on both sides. A sealing ring is provided between the first sealing structure (71) and the end cap (1) or the first cover plate (61). The second sealing structure (72) also has protrusions on both sides facing the housing (2) and the second cover plate (62). The second sealing structure (72) is fixed inside the end cap (1) and the first cover plate (61) respectively by the protrusions on both sides. A sealing ring is provided between the second sealing structure (72) and the end cap (1) or the first cover plate (61).

9. A submerged oil-cooled motor according to claim 6, characterized in that, The first cover plate (61) and the second cover plate (62) are both stepped in cross section. Both the first cover plate (61) and the second cover plate (62) are provided with clearance through holes that are adapted to the position and diameter of the first axial cooling channel (31) and the second axial cooling channel (32). The inner diameter of the first cover plate (61) is greater than or equal to the inner diameter of the stator core (3).

10. A submerged oil-cooled motor according to claim 6, characterized in that, The first axial cooling channels (31) are arranged in a ring array inside the stator core (3). The number of the first axial cooling channels (31) is the same as the number of stator slots. The number of the second axial cooling channels (32) opened at the bottom of the stator slots is also the same as the number of stator slots. The second axial cooling channels (32) opened at the teeth or yoke are arranged in a ring array on the cross section of the stator core (3).

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