Stator excircle staggered oil path cooling motor

Abstract

The invention discloses a stator excircle staggered oil path cooling motor, which comprises a stator assembly, a rotor assembly, an end cover, a casing and an oil injection assembly, and is characterized in that the stator assembly comprises a plurality of laminated punching sheet lamination segments, grooves are circumferentially distributed in the outer edges of punching sheets, and the lamination segments are rotated by an angle and then are stacked, so that the grooves of the adjacent punching sheet lamination segments are communicated with each other and are circumferentially staggered with each other; the two ends of the casing are connected with the end covers respectively, the stator assembly is fixed in the casing, a cooling cavity is formed among the periphery of the stator assembly, the casing and the end covers, the rotor assembly penetrates through the inner side of the stator assembly, the two ends of the rotor assembly are rotationally connected with the end covers respectively, and a liquid cooling oil channel communicated with the cooling cavity is formed in the inner side of the rotor assembly; an oil injection assembly is arranged between the end portion of the stator assembly and the end cover, and a staggered oil channel formed by the staggered grooves in the outer circle of the stator iron core and the machine shell communicates the oil injection assembly with a cooling cavity formed by the machine shell and the end cover. The motor has the advantages of simple structure, few punching sheet types, small influence on motor torque characteristics, remarkable cooling effect and the like.

Description

Technical Field

[0001] The invention belongs to the technical field of drive motors, and in particular relates to a motor with stator outer circle staggered oil circuit cooling for driving an electric vehicle. Background Art

[0002] The trend of miniaturization of passenger car motors has put forward increasingly stringent conditions for motor design. Motor miniaturization can significantly increase the power density of motors and reduce the weight of the electric drive system assembly, but it also poses challenges to the heat dissipation of motors. Traditional water-cooled motors take away the heat of the motor when the cooling water flows through the water jacket set on the outside of the casing. The heat generated inside the motor is first transferred to the casing or the surface of the water channel, and then heat is exchanged with the cooling water. The coolant cannot directly cool the heat sources such as the stator core, windings and rotors, and permanent magnets.

[0003] The cooling oil of the oil-cooled motor structure directly contacts the heat-generating components, which can effectively solve the heating problem of the core, winding and rotor. It is a new direction for the development of passenger car motor cooling methods.

[0004] The most serious heating of new energy permanent magnet motors is in the winding and stator core areas. The existing oil-cooled motors have the following solutions to cool the stator core, windings and rotor at the same time:

[0005] (1) An oil spray pipe is provided inside the motor, and cooling oil is sprayed directly to the end of the stator winding through the oil spray pipe.

[0006] (2) Slots are cut at the edge of the motor core yoke, and a cooling oil flow channel is formed when the stator core and the housing are matched. When the cooling medium flows through, it takes away the heat of the stator core.

[0007] The problem with solution (1) is that the structure is complex and requires an oil injection pipe structure, and the oil can only cool the end winding position. The problem with solution (2) is that the cooling oil can only cool the stator core part, and the cooling oil is not violently disturbed during the flow process, so the cooling effect is poor. Summary of the invention

[0008] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a motor with stator outer circle staggered oil circuit cooling which has a compact structure, a wide cooling range and a significant cooling effect.

[0009] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0010] A motor with stator outer circle staggered oil circuit cooling, comprising: a stator assembly, a rotor assembly, an end cover, a casing and an oil injection assembly;

[0011] The stator assembly consists of a stator core and windings embedded in the stator core. The stator core is composed of multiple stacked segments of stator punching sheets. The outer circumferential surface of the stator punching sheet is circumferentially distributed with grooves, and the inner circumference of the stator punching sheet is distributed with winding slots. By stacking with a rotation angle, the winding slots of adjacent segments coincide and align, and the groove parts on the outer circumferential surface partially coincide and communicate while being circumferentially staggered to form an alternating oil passage.

[0012] Both ends of the housing are respectively connected to the end covers. The stator assembly is fixed inside the housing. A sealed cooling cavity is formed between the outer circumference of the stator assembly and the housing and the end covers. The rotor assembly passes through the inner side of the stator assembly and is respectively rotatably connected to the end covers at both ends. A liquid cooling oil passage communicating with the cooling cavity is provided inside the rotor assembly. An oil injection assembly is arranged between the end of the stator assembly and the end cover. The alternating oil passage formed by the alternating grooves on the outer circumference of the stator core and the housing connects the oil injection assemblies at both ends of the stator core with the cooling cavity formed by the housing and the end covers. An oil inlet and an oil outlet are provided on the end cover or the housing. The cooling oil input from the oil inlet first flows through the alternating oil passage on the outer side of the stator assembly to disturb and cool the stator core, and then is sprayed to the end of the winding by the oil injection assembly to cool the winding. The cooling oil input inside the rotor assembly first cools the inside of the rotor assembly, and then is sprayed to the inner ring surface of the winding. The cooling oil is discharged through the oil outlet.

[0013] As a further improvement of the present invention, the stator punching sheet includes a first stator punching sheet and a second stator punching sheet. Multiple stacked segments of the second stator punching sheet are respectively stacked on both sides of the stacked segment of the first stator punching sheet. The stacked segment of the first stator punching sheet corresponds to the oil inlet. The cooling oil input from the oil inlet flows into the circumferential space formed by the first stator punching sheet and the housing, and then diffuses and flows into the circumferential space formed by the second stator punching sheet and the housing.

[0014] As a further improvement of the present invention, the oil injection assembly includes: an oil injection ring, an oil storage cavity, and oil injection holes. Both ends of the oil injection ring are respectively connected to the end of the second stator punching sheet and the end cover. The oil injection ring and the cooling cavity form a circumferential oil storage cavity. Multiple oil injection holes are provided on the oil injection ring. The cooling oil flowing through the second stator punching sheet converges in the oil storage cavity and is sprayed to the outside of the end of the winding through the oil injection holes to achieve cooling of the end of the winding.

[0015] As a further improvement of the present invention, the rotor assembly includes a rotating shaft and a rotor core. Both ends of the rotating shaft are respectively rotatably connected to the end covers. The rotor core is fixed on the rotating shaft. The rotating shaft drives the rotor core to rotate inside the stator assembly.

[0016] As a further improvement of the present invention, an oil passage is provided inside the rotating shaft, and oil throwing holes are provided on the oil passage. Multiple oil throwing holes are respectively located on both sides of the rotor core. The cooling oil input from the oil passage of the rotating shaft first cools the rotating shaft, and then is sprayed to the inner ring surface of the winding by the oil throwing holes to achieve cooling of the end of the winding and the inner ring surface of the winding.

[0017] As a further improvement of the present invention, a plurality of second grooves are provided on the outer circumference of the second stator punching sheet, and the second grooves are used as flow channels for cooling oil; the second grooves are rectangular or semi-circular.

[0018] As a further improvement of the present invention, the oil injection ring is of a cylindrical type or an L-shaped cylindrical type; the oil injection holes are evenly distributed or arbitrarily distributed on the oil injection ring.

[0019] As a further improvement of the present invention, the end cover includes a front end cover and a rear end cover, and both ends of the machine shell are respectively connected to the front end cover and the rear end cover; alternatively, the machine shell is integrally formed with the front end cover or the rear end cover.

[0020] As a further improvement of the present invention, the oil inlet is arranged on the front end cover or the rear end cover. After the oil fluid enters from the oil inlet, it passes through the corresponding side oil storage cavity, then flows through the stator staggered oil channels to reach the oil storage cavity on the other side, and is sprayed out from the oil injection holes corresponding to the two side oil storage cavities to cool the outer side of the winding end; the stator assembly is composed of stator punching sheets stacked by rotation.

[0021] Compared with the prior art, the advantages of the present invention are as follows:

[0022] 1. For the motor with stator outer circumference staggered oil circuit cooling of the present invention, by arranging the stator assembly in the machine shell, both ends of the machine shell are respectively connected to the end covers, a sealed cooling cavity is formed between the outer circumference of the stator assembly and the machine shell and the end covers, the rotor assembly is arranged inside the stator assembly, both ends of the rotor assembly are respectively rotatably connected to the end covers, and at the same time, a liquid cooling oil channel communicated with the cooling cavity is arranged inside the rotor assembly; further, an oil injection assembly is arranged between the end of the stator assembly and the end cover, a groove is arranged inside the stator assembly to embed the winding, the winding ends are located at both ends of the stator assembly, and the winding ends are located inside the oil injection assembly; an oil inlet and an oil outlet are respectively arranged at the top and bottom of the machine shell. The cooling oil input from the oil inlet first flows through the outside of the stator assembly to cool the stator assembly, and then is sprayed to the outside of the winding end through the oil injection assembly to realize the cooling of the winding end; the cooling oil input from the inside of the rotor assembly first cools the inside of the rotor assembly, and then is sprayed to the inner ring surface of the winding to cool the winding end and the inner ring surface of the winding; under the influence of gravity, all the cooling oil will finally be collected into the oil return channel and discharged from the oil outlet; the motor with stator outer circumference staggered oil circuit cooling of the present invention effectively cools the inside of the rotor, the stator iron core, the stator end winding and the inner ring surface of the winding, effectively reduces the temperature rise of the stator iron core and the winding of the motor, and improves the reliability of the motor. Further, due to the staggered oil grooves on the iron core surface, the risk of sliding between the stator iron core and the machine shell is reduced, and the installation stability of the stator iron core is improved.

[0023] 2. For the motor with stator outer - circle staggered oil - path cooling of the present invention, the stator assembly only includes two types of stator punching sheets, namely the first stator punching sheet and the second stator punching sheet. By stacking the second stator punching sheets on both sides of the first stator punching sheet respectively, and there are first grooves for embedding windings on the inner sides of both the first stator punching sheet and the second stator punching sheet, a stator core with simple structure and convenient disassembly and assembly is obtained, which has little influence on the torque characteristics of the motor; the diameter of the first stator punching sheet is slightly smaller than the inner diameter of the motor housing. After the first stator punching sheets are stacked, a circumferential annular space is formed between the outer side of the first stator punching sheet and the inner side of the motor housing, and between the outer side of the second stator punching sheet and the inner side of the motor housing. The cooling oil input from the oil inlet first flows in the corresponding circumferential annular space to cool the stator core; further, there are multiple second grooves on the outer side of the second stator punching sheet, and the second grooves on the outer sides of two adjacent second stator punching sheets are staggered with each other, forming staggered cooling oil flow channels, which prolongs the flow path of the cooling oil on the outer side of the second stator punching sheet, enables the cooling oil to contact the outer wall of the stator core for a longer time, and at the same time enhances the disturbance of the oil during the flow in the staggered oil channels, significantly improving the cooling effect of the stator core. At the same time, since the staggered oil channels can be realized by rotating and stacking the second punching sheets, the types of punching sheets are greatly reduced, the structure is simpler, and the cost is lower.

[0024] 3. For the motor with stator outer - circle staggered oil - path cooling of the present invention, by arranging a shaft oil - path inside the rotating shaft and providing oil - throwing holes on the shaft oil - path, and multiple oil - throwing holes are respectively located on both sides of the rotor core; the cooling oil input from the shaft oil - path first cools the rotating shaft, and then is sprayed onto the inner ring surface of the winding end by the oil - throwing holes, realizing the cooling of the winding end and the inner ring surface of the winding, improving the heat - transfer effect of the end winding. The motor with stator outer - circle staggered oil - path cooling of the present invention realizes all - around cooling from the inside to the outside, improving the reliability of the motor. Description of the Drawings

[0025] Figure 1 It is a schematic diagram of the principle of the motor with stator outer - circle staggered oil - path cooling of the present invention.

[0026] Figure 2 It is a schematic diagram of the structural principle of the first stator punching sheet in the present invention.

[0027] Figure 3 It is a schematic diagram of the structural principle of the second stator punching sheet in the present invention.

[0028] Figure 4 It is a schematic diagram of the structural principle of the stator assembly in the present invention.

[0029] Figure 5 It is a schematic diagram of the structural principle of the stator assembly and the oil - injection assembly in the present invention.

[0030] Legend: 1. Inlet port; 21. Oil return flow path; 22. Outlet port; 3. Stator assembly; 31. First stator punching; 32. Second stator punching; 33. First groove; 34. Protrusion; 35. Second groove; 4. Rotor assembly; 41. Rotating shaft; 42. Rotor core; 411. Oil passage in the rotating shaft; 412. Oil slinging hole; 5. Winding end; 6. End cover; 61. Front end cover; 62. Rear end cover; 7. Housing; 8. Cooling cavity; 9. Oil spraying ring; 10. Oil storage cavity; 11. Oil spraying hole. Detailed implementation manner

[0031] The present invention will be further described below in conjunction with the accompanying drawings of the specification and specific preferred embodiments, but the protection scope of the present invention is not limited thereby.

[0032] Embodiment

[0033] As Figures 1 to 5 shown, the motor with staggered oil circuits for cooling the outer circumference of the stator of the present invention includes: a stator assembly 3, a rotor assembly 4, an end cover 6, a housing 7 and an oil spraying assembly. Both ends of the housing 7 are respectively connected to the end cover 6, and the stator assembly 3 and the rotor assembly are fixed in the space formed by the housing 7 and the end cover 6. The stator assembly 3 is composed of a stator core and windings embedded in the stator core. The stator core is composed of multiple stacked stator punchings. The outer circumference surface of the stator punching is circumferentially distributed with grooves, and the inner circumference of the stator punching is distributed with winding slot grooves. By stacking with a rotation angle, the winding slot grooves of adjacent stacked segments are overlapped and aligned, and the groove parts on the outer circumference surface are partially overlapped and communicated and circumferentially staggered to form a staggered oil circuit. In this embodiment, the stator assembly 3 includes multiple stacked punching segments. The outer circumference edge of the punching is circumferentially distributed with grooves. After stacking by rotating the segments by an angle, the grooves of adjacent punching segments are communicated with each other and circumferentially staggered;

[0034] Furthermore, both ends of the housing 7 are respectively connected to the end cover 6. The stator assembly 3 is fixed in the housing 7. A sealed cooling cavity 8 is formed between the outer circumference of the stator assembly 3 and the housing 7 and the end cover 6. The rotor assembly 4 passes through the inner side of the stator assembly 3 and is rotatably connected to the end cover 6 at both ends. A liquid cooling oil passage communicated with the cooling cavity 8 is provided inside the rotor assembly 4. An oil spraying assembly is provided between the end of the stator assembly 3 and the end cover 6. The staggered oil circuit formed by the staggered grooves on the outer circumference of the stator core and the housing connects the oil spraying assemblies at both ends of the stator core with the cooling cavity 8 formed by the housing 7 and the end cover 6; An inlet port 1 and an outlet port 22 are provided on the end cover 6 or the housing 7. The cooling oil input from the inlet port 1 first flows through the staggered oil circuit on the outer side of the stator assembly 3 to violently disturb and cool the stator core, and then is sprayed onto the winding end by the oil spraying assembly to cool the winding. The cooling oil input inside the rotor assembly first cools the inside of the rotor assembly, and then is sprayed onto the inner ring surface of the winding. The cooling oil is discharged through the outlet port.

[0035] In this embodiment, by disposing the stator assembly 3 inside the housing 7, both ends of the housing 7 are respectively connected to the end covers 6. A sealed cooling cavity 8 is formed between the outer periphery of the stator assembly 3 and the housing 7 and the end covers 6. The rotor assembly 4 is disposed through the inner side gap of the stator assembly 3. Both ends of the rotor assembly 4 are respectively rotatably connected to the end covers 6. Meanwhile, a liquid cooling oil passage communicating with the cooling cavity 8 is provided inside the rotor assembly 4. Further, an oil injection assembly is provided between the end of the stator assembly 3 and the end cover 6. A groove is provided inside the stator assembly 3 to embed the winding. The winding end 5 is located at both ends of the stator assembly 3, and the winding end 5 is located inside the oil injection assembly. An oil inlet 1 and an oil outlet 22 are respectively provided at the top and bottom of the housing 7. The cooling oil input from the oil inlet first flows through the outside of the stator assembly to cool the stator assembly, and then is sprayed to the outside of the winding end through the oil injection assembly to achieve the cooling of the winding end. The cooling oil input from the inside of the rotor assembly first cools the inside of the rotor assembly, and then is sprayed to the inner ring surface of the winding to cool the winding end and the inner ring surface of the winding. Under the influence of gravity, all the cooling oil will finally be collected in the oil return passage and discharged from the oil outlet. The motor with staggered oil circuits on the outer circle of the stator in this embodiment effectively cools the inside of the rotor, the stator core, the stator end winding and the inner ring surface of the winding, effectively reduces the temperature rise of the stator core and winding of the motor, and improves the reliability of the motor.

[0036] As Figure 1 shown, in this embodiment, the end cover 6 includes a front end cover 61 and a rear end cover 62. Both ends of the housing 7 are respectively connected to the front end cover 61 and the rear end cover 62. Further, since the oil injection assembly is provided to connect both ends of the stator assembly 3 to the front end cover 61 and the rear end cover 62 respectively, the risk of sliding between the stator core and the housing 7 is reduced, and the installation stability of the stator core is improved. It can be understood that in other embodiments, the housing 7 can also be integrally formed with the front end cover 61 or the rear end cover 62.

[0037] The bottom of the cooling cavity 8 is communicated with the oil return passage 21, and the oil return passage 21 is communicated with the oil outlet 22 located under the rear end cover 62. The cooling oil converges at the bottom of the cooling cavity 8 and then flows through the oil return passage 21, and then moves to the oil outlet 22 to complete the oil cooling process. The cooling cavity 8 of this embodiment can be realized by machining, welding or casting processes, and the manufacturing process is simple and the cost is low.

[0038] As Figure 1As shown in the figure, in this embodiment, the stator punching is formed by stacking the first stator punching 31 and the second stator punching 32. By using two types of stator punchings, the stator production process is simplified as much as possible, and the stacking lengths of the first stator punching 31 and the second stator punching 32 can be changed as long as the total axial length of the stator core remains unchanged. On both sides of the stacking section of the first stator punching 31, multiple stacking sections of the second stator punching 32 are stacked respectively. The stacking section of the first stator punching 31 corresponds to the oil inlet 1. After the cooling oil input from the oil inlet 1 flows into the circumferential space formed by the first stator punching 31 and the housing 7, it then diffuses and flows into the circumferential space formed by the second stator punching 32 and the housing 7.

[0039] In other embodiments, when the oil inlet 1 is arranged on the front end cover 61 or the rear end cover 62, after the oil enters from the oil inlet 1, it passes through the corresponding oil storage cavity 10 on that side, then flows through the stator staggered oil channels to reach the oil storage cavity 10 on the other side, and is sprayed out from the spray holes 11 corresponding to the oil storage cavities 10 on both sides to cool the outside of the winding end 5. At this time, the stator assembly 3 can be composed only of the stator punchings 32 stacked in rotation.

[0040] Furthermore, the diameter of the first stator punching 31 is slightly smaller than the inner diameter of the housing 7. After the first stator punchings 31 are stacked, a circumferential annular space is formed between its outer diameter and the inner diameter of the housing 7. After the cooling oil flows into this circumferential annular space from the oil inlet 1, a circumferential oil ring is formed.

[0041] As Figure 2 and Figure 3 shown in the figure, in this embodiment, multiple first grooves 33 and multiple protrusions 34 are provided on the inner sides of both the first stator punching 31 and the second stator punching 32. The first grooves 33 are used to embed windings. The second stator punching 32 is provided with multiple second grooves 35, and the second grooves 35 are used as flow channels for the cooling oil. Further, the second grooves 35 are located on the outer circumference of the second stator punching 32. Compared with setting oil through holes on the iron core, it is beneficial to reduce the outer diameter of the punching. The shape of the second grooves 35 can be rectangular, waist-shaped or other shapes.

[0042] In this embodiment, both the first stator punching 31 and the second stator punching 32 are circular rings, as Figure 2 and Figure 3 shown in the figure. The first stator punching 31 is formed with the first grooves 33 and the protrusions 34 along the circumferential direction of the inner circle, and the first grooves 33 and the protrusions 34 are evenly distributed along the circumferential direction. From Figure 2 and Figure 3As can be seen, the first grooves 33 and the protrusions 34 are evenly spaced. That is to say, the first grooves 33, the protrusions 34, the first grooves 33... are arranged along the circumferential direction at the same interval. During the process of assembling multiple stator laminations into the stator assembly 3, the first grooves 33 of multiple stator laminations are arranged opposite to each other, and the protrusions 34 of multiple stator laminations are arranged opposite to each other, so that multiple Figure 4 stator grooves shown are formed on the inner wall of the stator assembly 3 for nesting the windings.

[0043] As Figure 4 and Figure 5 shown, in this embodiment, the second grooves 35 on the outer sides of two adjacent second stator laminations 32 are staggered with each other to form staggered flow channels, so as to extend the flow path of the cooling oil flowing outside the second stator laminations 32. Moreover, the staggered flow channels can strengthen the flow interference effect of the oil in the stator lamination flow channels and strengthen the heat exchange between the stator laminations and the oil. The number of the second grooves 35 is greater than the number of the first grooves 33. It can be understood that the number of the second grooves 35 can be changed as long as there is a staggered space between the overlapping segments of two adjacent second stator laminations 32 and no dead zone for oil flow is formed.

[0044] Specifically, after the second stator lamination 32 rotates a certain angle, when the stator grooves are aligned, the positions of the first lamination 31 and the second grooves 35 can be staggered with each other to form staggered flow channels, enhancing the disturbance of the oil flow in the channels to enhance the cooling effect. In this embodiment, the number of stator slots is 48, the number of the second grooves 35 is 131, and the stator slots can be aligned after the second stator lamination 32 rotates 90°, but the second grooves 35 are staggered by a certain angle. At this time, staggered oil channels can be formed between the overlapping segments of two adjacent second stator laminations 32. After the stator laminations are stacked to form a stack, the cooling oil flows through the upstream stator lamination stack and flows to the downstream stator lamination stack through the staggered positions of the second grooves 35, and finally flows out of the stator assembly through the end stator lamination.

[0045] When the cooling oil flows into the staggered oil channels formed by the second grooves 35, a turbulent flow can be formed in the staggered oil channels. In this way, the contact time between the cooling oil and the outer wall of the stator assembly 3 can be longer. In addition, when the cooling oil flows to both sides of the stator assembly 3, it can form multiple fine streams through the spraying assembly and continuously spray onto the end windings 5, so that the contact area between the end windings 5 and the cooling oil is larger and the contact time is longer, improving the cooling effect of the end windings 5. Further, by forming a staggered flow channel array through the second grooves 35 of the second stator lamination 32, there can be gaps between every two second grooves 35 in the flow channels both axially and circumferentially. When the cooling oil flows between the flow channel gaps, the flow velocity of the cooling oil can be greatly reduced, thereby increasing the contact duration between the cooling oil and the stator assembly 3.

[0046] As Figure 1As shown in the figure, in this embodiment, the oil injection assembly includes an oil injection ring 9, an oil storage cavity 10, and oil injection holes 11. Both ends of the oil injection ring 9 are respectively connected to the ends of the second stator punching 32 and the end cover. The oil injection ring 9 and the cooling cavity 8 form a circumferential oil storage cavity 10. The oil injection ring 9 is provided with a plurality of oil injection holes 11. The cooling oil flowing through the second stator punching 32 converges in the oil storage cavity 10 and is sprayed to the outside of the winding end 5 through the oil injection holes 11 to cool the winding end 5 and the inner ring surface of the winding. As Figure 5 shown, the oil injection ring 9 is respectively connected to both sides of the stator assembly 3. After the cooling oil is sprayed from the oil injection holes 11 to the end winding 5 to strengthen the heat dissipation of the winding, it drops onto the rotor assembly 4 under the action of gravity to cool the rotor, and then converges at the bottom of the cooling cavity 8 under the action of gravity.

[0047] In this embodiment, the oil injection ring 9 has a straight cylinder structure, and the oil injection holes 11 are evenly distributed on the oil injection ring 9. In other embodiments, the oil injection ring 9 can also be set to an L-shaped cylinder structure, and the oil injection holes 11 are arbitrarily distributed on the oil injection ring 9, as long as the cooling oil can be sprayed onto the winding end 5.

[0048] As Figure 1 shown, in this embodiment, the rotor assembly 4 includes a rotating shaft 41 and a rotor core 42. Both ends of the rotating shaft 41 are respectively rotatably connected to the end cover. The rotor core 42 is fixed on the rotating shaft 41, and the rotating shaft 41 drives the rotor core 42 to rotate inside the stator assembly 3.

[0049] Further, a blind hole structure rotating shaft oil passage 411 is provided inside the rotating shaft 41, and oil throwing holes 412 are provided on the rotating shaft oil passage 411. A plurality of oil throwing holes 412 are respectively located on both sides of the rotor core 42. The cooling oil input from the rotating shaft oil passage 411 first cools the rotating shaft 41, and then is sprayed to the inner ring surface of the winding by the oil throwing holes 412 to cool the winding end 5 and the inner ring surface of the winding.

[0050] In this embodiment, the rotating shaft 41 is circumferentially provided with oil throwing holes 412. When the motor runs, the rotating shaft 41 rotates, and the cooling oil in the rotating shaft oil passage 411 is sprayed to the inner ring surface of the end winding 5 to strengthen the heat exchange effect of the inner ring surface of the winding. Subsequently, the cooling oil converges at the bottom of the cooling cavity 8 and is discharged through the oil return passage 21 and the oil outlet 22.

[0051] When the motor is running, the cooling oil is input into the motor through the oil inlet 1, and then flows through the staggered channels formed by stacking the second grooves 35. After flowing out from the stator laminations at the end of the stator, it converges in the oil storage cavity 10 formed by four components: the end cover, the housing 7, the stator core, and the oil injection ring 9, and then is sprayed from the oil injection holes 11 to the end winding 5 to take away the heat generated by the end winding 5. At the same time, the cooling oil introduced into the hollow rotating shaft 41 is sprayed to the inner ring surface of the winding under the action of centrifugal force through the oil throwing holes 412, and then converges at the bottom of the housing 7 and is discharged from the motor through the oil return channel 21 and the oil outlet 22. The cooling oil path is as Figure 1 shown by the arrow path in

[0052] Although the present invention is disclosed above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make many possible changes and modifications to the technical solution of the present invention by using the methods and technical contents disclosed above, or modify it into an equivalent embodiment with equivalent changes. Therefore, any simple modification, equivalent replacement, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the technical solution of the present invention still fall within the scope of protection of this technical solution.

Claims

1. A motor with a stator outer circle staggered oil circuit cooling, characterized in that, comprising: a stator assembly (3), a rotor assembly (4), end covers (6), a housing (7) and an oil injection assembly; The stator assembly (3) is composed of a stator core and windings embedded in the stator core. The stator core is composed of multiple stacked stator laminations. The outer circumferential surface of the stator lamination is circumferentially distributed with grooves, and the inner circle of the stator lamination is distributed with winding slot grooves. By stacking at a rotation angle, the winding slot grooves of adjacent stacks coincide and align, and the groove parts on the outer circumferential surface coincide and communicate and are circumferentially staggered with each other to form a staggered oil circuit; Both ends of the housing (7) are respectively connected to the end covers (6). The stator assembly (3) is fixed in the housing (7). A sealed cooling cavity (8) is formed between the outer circumference of the stator assembly (3) and the housing (7) and the end covers (6). The rotor assembly (4) passes through the inner side of the stator assembly (3) and is respectively rotatably connected to the end covers (6) at both ends. A liquid cooling oil passage communicated with the cooling cavity (8) is provided inside the rotor assembly (4). An oil injection assembly is arranged between the end of the stator assembly (3) and the end cover (6). The staggered oil passage formed by the staggered grooves on the outer circle of the stator core and the housing (7) connects the oil injection assemblies at both ends of the stator core with the cooling cavity (8) formed by the housing (7) and the end covers (6). An oil inlet (1) and an oil outlet (22) are provided on the end cover (6) or the housing (7). The cooling oil input from the oil inlet (1) first flows through the staggered oil passage on the outer side of the stator assembly (3) to disturb and cool the stator core, and then is sprayed to the winding end (5) by the oil injection assembly to cool the winding. The cooling oil input inside the rotor assembly (4) first cools the inside of the rotor assembly (4), and then is sprayed to the inner ring surface of the winding. The cooling oil is discharged through the oil outlet (22).

2. The motor with a stator outer circle staggered oil circuit cooling according to claim 1, characterized in that, The stator lamination includes a first stator lamination (31) and a second stator lamination (32). Multiple second stator lamination (32) stacks are respectively stacked on both sides of the first stator lamination (31) stack. The first stator lamination (31) stack corresponds to the oil inlet (1). The cooling oil input from the oil inlet (1) flows into the circumferential space formed by the first stator lamination (31) and the housing (7), and then diffuses and flows to the circumferential space formed by the second stator lamination (32) and the housing (7).

3. The motor with a stator outer circle staggered oil circuit cooling according to claim 2, characterized in that, The oil injection assembly includes: an oil injection ring (9), an oil storage cavity (10) and oil injection holes (11). Both ends of the oil injection ring (9) are respectively connected to the end of the second stator lamination (32) and the end cover (6). The oil injection ring (9) and the cooling cavity (8) form a circumferential oil storage cavity (10). A plurality of oil injection holes (11) are provided on the oil injection ring (9). The cooling oil flowing through the second stator lamination (32) converges in the oil storage cavity (10) and is sprayed to the outside of the winding end (5) through the oil injection holes (11) to realize the cooling of the winding end (5).

4. The motor with a stator outer circle staggered oil circuit cooling according to claim 3, It is characterized in that the rotor assembly (4) includes a rotating shaft (41) and a rotor core (42). Both ends of the rotating shaft (41) are rotatably connected to the end covers (6), the rotor core (42) is fixed on the rotating shaft (41), and the rotating shaft (41) drives the rotor core (42) to rotate inside the stator assembly (3).

5. The motor with stator outer circle staggered oil circuit cooling according to claim 4, It is characterized in that an oil passage (411) is provided inside the rotating shaft (41), and oil throwing holes (412) are provided on the oil passage (411) of the rotating shaft. A plurality of the oil throwing holes (412) are respectively located on both sides of the rotor core (42); the cooling oil input from the oil passage (411) of the rotating shaft first cools the rotating shaft (41), and then is sprayed onto the inner ring surface of the winding through the oil throwing holes (412) to achieve cooling of the winding end (5) and the inner ring surface of the winding.

6. The motor with stator outer circle staggered oil circuit cooling according to claim 2, It is characterized in that a plurality of second grooves (35) are provided on the outer circle of the second stator punching (32), and the second grooves (35) are used as flow channels for the cooling oil; the second grooves (35) are rectangular or semi-circular.

7. The motor with stator outer circle staggered oil circuit cooling according to claim 3, It is characterized in that the oil injection ring (9) is cylindrical or L-shaped; the oil injection holes (11) are evenly distributed or arbitrarily distributed on the oil injection ring (9).

8. The motor with stator outer circle staggered oil circuit cooling according to claim 3, It is characterized in that the end cover (6) includes a front end cover (61) and a rear end cover (62). Both ends of the machine shell (7) are respectively connected to the front end cover (61) and the rear end cover (62); alternatively, the machine shell (7) is integrally formed with the front end cover (61) or the rear end cover (62).

9. The motor with stator outer circle staggered oil circuit cooling according to claim 8, It is characterized in that the oil inlet (1) is arranged on the front end cover (61) or the rear end cover (62). After the oil enters from the oil inlet (1), it passes through the corresponding side oil storage cavity (10), then flows through the stator staggered oil circuit to reach the oil storage cavity (10) on the other side, and is sprayed out from the oil injection holes (11) corresponding to the oil storage cavities (10) on both sides to cool the outside of the winding end (5); the stator assembly (3) is composed of stacked stator punchings by rotation.

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