Stator windowing diversion centripetal oil-cooled motor

Abstract

The invention discloses a stator windowing diversion centripetal oil-cooled motor, which comprises a stator assembly, a rotor assembly, a casing and an oil injection component with a windowing diversion structure, the stator assembly comprises a plurality of laminated punching sheet lamination sections, oil holes are circumferentially distributed in the outer circle side of each punching sheet, and the oil holes of the lamination sections are communicated with one another; the stator assembly is fixed in the machine shell, a cooling cavity is formed among the periphery of the stator assembly, the periphery of the rotor assembly and the machine shell, the rotor assembly penetrates through the inner side of the stator assembly, the two ends of the rotor assembly are rotationally connected with end covers of the machine shell respectively, a rotating shaft oil channel communicated with the cooling cavity is formed in the inner side of the rotor assembly, and an oil injection component of a windowing flow guide structure is arranged at the end of the stator assembly. And the oil injection components at the two ends of the stator iron core are communicated with the cooling cavity through an internal oil channel in the outer circle of the stator iron core. Oil enters the iron core and then flows to the two end faces of the iron core, the oil is sprayed out through the spraying holes, and the oil is guided and sprayed to the winding through the oil spraying component of the windowing flow guide structure. The cooling device has the advantages of compact structure, remarkable cooling effect and the like.

Description

Technical Field

[0001] The invention belongs to the technical field of novel enclosed high-power-density passenger car oil-cooled motors, and in particular relates to a stator window-opening flow-guiding centripetal oil-cooled motor. Background Art

[0002] New passenger car motors are developing in the direction of miniaturization and high power. High power density motors can output greater power at the same volume or mass, improve continuous driving ability and overtaking acceleration ability, and obtain excellent power performance and driving experience. At the same output power, the miniaturized and lightweight design layout is more flexible, and high performance is achieved in a given space, which reduces the amount of materials used, reduces the total weight of the electric drive assembly, and saves manufacturing costs. The development of new high power density passenger car motors also puts forward more stringent requirements on the heat dissipation capacity of the motor. The most direct way to improve the heat dissipation efficiency is to shorten the heat transfer path between the heat-generating components such as the motor stator and rotor and the cooling medium or reduce the heat transfer thermal resistance between the two.

[0003] The parts of the motor that heat up the most are usually the stator core, end windings, and rotor permanent magnets. Water-cooled motors transfer the generated heat to the casing or waterway surface through heat conduction first, and then exchange heat with cooling water. The cooling water cannot directly cool the heat sources such as the stator core, windings, and rotor permanent magnets, resulting in a long heat transfer path, large heat transfer resistance, and limited heat dissipation capacity. It cannot meet the cooling requirements brought about by the increased heat power per unit volume of new high-power density passenger car motors. Oil-cooled motors directly spray cooling oil to the end windings or directly flow through the hollow shaft. The cooling oil can directly contact the motor's stator windings and rotor and other heat-generating components, greatly shortening the heat transfer path and directly taking away the heat from the end windings and the rotor surface. The cooling efficiency is much higher than that of water-cooled motors, and it is a new development direction for efficient cooling of new passenger car motors.

[0004] The existing solutions for cooling the stator core, windings and rotor of oil-cooled motors are mainly: (1) setting an oil spray pipe inside the motor to spray the cooling oil directly to the stator end windings through the oil spray pipe; (2) slotting the edge of the motor core yoke to form a cooling oil flow channel after the stator core and the housing are matched. When the cooling medium flows through, it takes away the heat of the stator core. Figure 1 shown.

[0005] The defect of the oil injection pipe structure is that it is difficult to achieve uniform coverage of the winding surface with oil, resulting in uneven cooling; the oil cooling structure represented by Tesla adds an oil injection ring, which is costly and has limited installation space. Figure 1 The defects of the oil channel structure are that the oil channel structure is complex, the flow resistance is large, and there are many types of stator punchings, which increases the difficulty of production and manufacturing and affects production efficiency. Summary of the invention

[0006] The technical problem to be solved by the present invention is as follows: In view of the above problems in the prior art, a stator window-guided centripetal oil-cooled motor is provided, which has a compact structure, low flow resistance, high cooling efficiency and low production difficulty.

[0007] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0008] A stator window-opening flow-guiding centripetal oil-cooling motor comprises: a stator assembly, a rotor assembly, a housing and an oil injection component with a window-opening flow-guiding structure;

[0009] The stator assembly is composed of a stator core and a winding embedded in the stator core. The stator core is composed of a plurality of stator punching sheets stacked together. The outer circumference of the punching sheets is provided with oil holes. The inner circumference of the stator punching sheets is provided with winding wire embedding grooves. The winding wire embedding grooves of adjacent stacked sections are overlapped and aligned by stacking at a rotation angle. The oil holes of the stacked sections are interconnected to form an oil path.

[0010] The stator assembly is fixed in the casing, and a sealed cooling cavity is formed between the outer periphery of the stator assembly, the outer periphery of the rotor assembly and the casing. The rotor assembly passes through the inner side of the stator assembly, and both ends are rotatably connected to the end covers of the casing respectively. A shaft oil channel connected to the cooling cavity is provided on the inner side of the rotor assembly; an oil spray component is provided at the end of the stator assembly, and an internal oil channel formed by the outer circle of the stator core connects the oil spray components at both ends of the stator core with the cooling cavity; an oil inlet and an oil outlet are provided on the casing, and the cooling oil input from the oil inlet first flows through the staggered internal oil channels on the outside of the stator assembly to disturb the stator core, and then is guided by the oil spray component with a window guide structure to spray to the end winding to cool the winding. The cooling oil input from the inner side of the rotor assembly first cools the inside of the rotor assembly, and then is sprayed to the inner annular surface of the winding, and the cooling oil is discharged through the oil outlet.

[0011] As a further improvement of the present invention, the oil injection component is a punching sheet stack structure or a guide ring structure; the oil injection component is provided with a plurality of inclined guide spray holes.

[0012] As a further improvement of the present invention, the guide spray holes are arranged in a single layer or multiple layers along the radial direction of the oil injection component, and the guide spray holes are evenly distributed or non-evenly distributed along the circumference of the oil injection component.

[0013] As a further improvement of the present invention, a directional nozzle or a guide vane is installed in the guide spray hole.

[0014] As a further improvement of the present invention, the stator punching sheet includes a first stator punching sheet and a second stator punching sheet, a plurality of second stator punching sheet segments are stacked on both sides of the first stator punching sheet segment, and the diameter of the first stator punching sheet is smaller than the diameter of the second stator punching sheet, and the first stator punching sheet segment corresponds to the oil inlet. The cooling oil input from the oil inlet first enters the outer ring of the first stator punching sheet to form an oil ring, and then flows and diffuses to the internal oil channel formed by the outer ring of the second stator punching sheet and the inner side of the casing to cool the straight section of the stator core, and then is ejected at a certain angle from the oil injection component with a window guide structure, and sprayed to the end winding position for cooling.

[0015] As a further improvement of the present invention, the first stator punching sheet is provided with oil storage channels at intervals in the circumferential direction to achieve uniform distribution of the cooling oil in the circumferential direction of the first stator punching sheet.

[0016] As a further improvement of the present invention, a plurality of grooves are provided on the outer circumference of the second stator punching sheet, and the grooves are used as cooling oil channels, and the shape of the grooves is square, circular, semicircular or fan-shaped.

[0017] As a further improvement of the present invention, adjacent overlapping segments of the stator punching sheets are overlapping and connected straight line segments or staggered segments.

[0018] As a further improvement of the present invention, the rotor assembly includes a hollow shaft and a rotor core, the two ends of the hollow shaft are respectively rotatably connected to the front cover and the rear cover of the casing, the rotor core is fixed on the hollow shaft, and the hollow shaft drives the rotor core to rotate inside the stator assembly.

[0019] As a further improvement of the present invention, a shaft oil channel is provided on the inner side of the hollow shaft, and oil-flinging holes are provided on the shaft oil channel, and the multiple oil-flinging holes are respectively located on both sides of the rotor core; the cooling oil input by the shaft oil channel first cools the hollow shaft, and then is sprayed onto the inner annular surface of the winding through the oil-flinging holes to achieve cooling of the end winding and the inner annular surface of the winding.

[0020] Compared with the prior art, the advantages of the present invention are:

[0021] 1. The stator window-guided centripetal oil-cooled motor of the present invention is provided with a stator assembly in a casing, a rotor assembly is penetrated inside the stator assembly, a sealed cooling cavity is formed between the outer periphery of the stator assembly and the outer periphery of the rotor assembly and the casing, and the two ends of the rotor assembly are respectively rotatably connected to the end covers of the casing, and a shaft oil passage communicating with the cooling cavity is provided inside the rotor assembly; further, an oil spraying component is provided at the end of the stator assembly, and the internal oil passage formed by the outer circle of the stator core connects the oil spraying components at the two ends of the stator core with the cooling cavity, a groove is provided inside the stator assembly to embed the winding, the end winding is located at the two ends of the stator assembly, and the end winding is located outside the oil spraying component; the top and bottom of the casing are respectively provided with an oil inlet and an oil outlet, and the oil is supplied from the oil inlet to the cooling cavity. The cooling oil first flows through the outside of the stator assembly to cool the stator assembly, and then is sprayed to the outside of the end winding at a certain angle through the oil spray component to enhance the heat dissipation of the winding; 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 end winding and the inner ring surface of the winding; the oil flows to the rotor assembly under the action of gravity to enhance the heat exchange effect of the rotor assembly, and all the cooling oil will finally be collected to the oil return flow channel by gravity and discharged from the oil outlet; the stator window diversion centripetal oil-cooled motor of the present invention realizes effective cooling of the rotor interior, stator core, stator end winding and inner ring surface of the winding, effectively reduces the temperature rise of the motor stator core and winding, and improves the reliability of the motor. Furthermore, due to the staggered oil grooves on the surface of the core, the risk of sliding between the stator core and the casing is reduced, and the installation stability of the stator core is improved.

[0022] 2. The stator window-guided centripetal oil-cooled motor of the present invention has a stator assembly that only includes two types of stator punchings, namely, a first stator punching and a second stator punching, which is conducive to simplifying the stator production process, and has a simple and compact structure, high design applicability, and simple installation. Specifically, by stacking the second stator punchings on both sides of the first stator punching, and the inner sides of the first stator punchings and the second stator punchings are provided with grooves for embedding windings, a stator core with a simple structure and convenient assembly and disassembly is obtained, which has little effect on the torque characteristics of the motor. At the same time, the diameter of the first stator punching is slightly smaller than the inner diameter of the second stator punching. After the first stator punchings are stacked, a circumferential annular space is formed between the outer side of the first stator punching and the inner side of the casing. The cooling oil input from the oil inlet first enters the outer ring annular space of the first stator punching to form an oil ring, and then flows and diffuses to the internal oil channel formed by the outer ring of the second stator punching, cools the straight section of the stator core, and then is ejected at a certain angle from the oil injection component with a window-guided structure, and sprays to the end winding position for cooling. The oil injection component is provided with a window guide structure to prevent the oil from being sprayed out vertically from the punching sheet, thereby ensuring that the cooling oil is accurately sprayed to the end winding, thereby achieving the purpose of cooling the end winding temperature.

[0023] 3. The stator window-guided centripetal oil-cooled motor of the present invention has a plurality of grooves on the outside of the second stator punching sheet, and the grooves on the outside of two adjacent second stator punching sheets are interconnected to form interconnected cooling oil flow channels, which prolongs the path of the cooling oil flowing on the outside of the second stator punching sheet, allowing the cooling oil to contact the outer wall of the stator core for a longer time, while enhancing the disturbance of the oil in the stator oil channel flow process, strengthening the heat exchange between the punching sheet and the oil, and significantly improving the cooling effect of the stator core. Subsequently, the cooling oil in the stator core is sprayed to the outer surface of the end winding through the oil spray component with a window-guided structure, taking away the heat generated by the end winding. At the same time, since the second punching sheet can realize the staggered oil channel by rotating and stacking, the types of punching sheets are greatly reduced, the structure is simpler, and the cost is lower.

[0024] 4. The stator window-guided centripetal oil-cooled motor of the present invention has a shaft oil passage on the inner side of the hollow shaft, and oil-slinging holes on the shaft oil passage, and the multiple oil-slinging holes are respectively located on both sides of the rotor core; the cooling oil input from the shaft oil passage first cools the hollow shaft, and then is sprayed to the inner ring surface of the winding end through the oil-slinging holes, thereby realizing cooling of the end winding and the inner ring surface of the winding and strengthening the overall heat exchange of the winding. The stator window-guided centripetal oil-cooled motor of the present invention realizes all-round cooling from the inside to the outside, thereby improving the reliability of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the oil passage of the iron core yoke in the prior art;

[0026] Figure 2 It is a schematic diagram of the structural principle of a stator window-guided centripetal oil-cooled motor in a specific embodiment of the present invention;

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

[0028] Figure 4 This is one of the schematic diagrams of the structural principle of the fuel injection component in a specific embodiment of the present invention;

[0029] Figure 5 for Figure 4 Schematic diagram of the structural principle at A in the middle;

[0030] Figure 6 It is a schematic diagram of the structural principle of the flow guide nozzle in a specific embodiment of the present invention;

[0031] Figure 7 This is the second schematic diagram of the structural principle of the fuel injection component in a specific embodiment of the present invention;

[0032] Figure 8 for Figure 7 Schematic diagram of the structural principle at B in the middle;

[0033] Fig. 9 It is a schematic diagram of the structural principle of the stator assembly in the present invention;

[0034] Fig.10 It is a schematic diagram of the structural principle of the stator assembly and the fuel injection component in the present invention.

[0035] Legend: 1. Hollow shaft; 2. Shaft oil channel; 3. Sealed bearing; 4. Cover plate; 5. End winding; 6. Casing; 61. Front cover; 62. Rear cover; 7. First stator punching sheet; 8. Oil inlet; 9. Internal oil channel; 10. Oil injection component; 101. Guide spray hole; 11. Second stator punching sheet; 111. Groove; 12. Oil throwing hole; 13. Rotor core; 14. Oil return channel; 15. Cooling cavity; 16. Oil outlet. DETAILED DESCRIPTION

[0036] The present invention is further described below in conjunction with the accompanying drawings and specific preferred embodiments, but the protection scope of the present invention is not limited thereby.

[0037] In the description of the present invention, it should be understood that the terms "side", "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0038] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0039] Example

[0040] like Figure 2 As shown, the stator window-guided centripetal oil-cooled motor of the present invention comprises: a stator assembly, a rotor assembly, a housing 6 and an oil injection component 10 with a window-guided structure. The stator assembly is composed of a stator core and a winding embedded in the stator core. The stator core is composed of a plurality of stator punchings stacked together. Oil holes are distributed circumferentially on the outer circumference of the punchings. Winding wire grooves are distributed on the inner circumference of the stator punchings. The winding wire grooves of adjacent stacked segments are overlapped and aligned by stacking at a rotation angle, and the oil holes of the stacked segments are interconnected to form an oil path.

[0041] The stator assembly is fixed in the housing 6, and a sealed cooling cavity 15 is formed between the outer periphery of the stator assembly, the outer periphery of the rotor assembly and the housing 6. The rotor assembly passes through the inner side of the stator assembly, and the two ends are respectively connected to the end cover of the housing 6 for rotation. The inner side of the rotor assembly is provided with a shaft oil passage 2 connected to the cooling cavity 15. An oil spraying component 10 is provided at the end of the stator assembly, and the internal oil passage 9 formed by the outer circle of the stator core connects the oil spraying components 10 at both ends of the stator core with the cooling cavity 15. The housing 6 is provided with an oil inlet 8 and an oil outlet 16. The cooling oil inputted from the oil inlet 8 first flows through the internal oil passage 9 on the outer side of the stator assembly to disturb and cool the stator core, and then is sprayed to the end winding 5 through the oil spraying component 10 to cool the winding. The cooling oil inputted from the inner side of the rotor assembly first cools the inside of the rotor assembly, and then is sprayed to the inner annular surface of the winding, and the cooling oil is discharged through the oil outlet 16.

[0042] In this embodiment, the stator assembly is arranged in the housing 6, the rotor assembly is penetrated inside the stator assembly, and a sealed cooling cavity is formed between the outer periphery of the stator assembly, the outer periphery of the rotor assembly and the housing. The two ends of the rotor assembly are respectively connected to the end cover of the housing for rotation, and the inner side of the rotor assembly is provided with a shaft oil passage 2 connected to the cooling cavity 15. Further, an oil spraying component 10 is arranged at the end of the stator assembly, and the internal oil passage 9 formed by the outer circle of the stator core connects the oil spraying components 10 at both ends of the stator core with the cooling cavity 15. A groove is arranged inside the stator assembly to embed the winding, and the end winding 5 is located at both ends of the stator assembly, and the end winding 5 is located outside the oil spraying component 10; the top and bottom of the housing 6 are respectively provided with an oil inlet 8 and an oil outlet 16, and the cooling oil inputted from the oil inlet 8 first flows through the outer side of the stator assembly to cool the stator assembly, and then is sprayed to the outer side of the end winding 5 at a certain angle through the oil spraying component 10 to enhance the heat dissipation of the winding. The cooling oil input from the inner side of the rotor assembly first cools the inside of the rotor assembly, and then sprays onto the inner annular surface of the winding to cool the end winding 5 and the inner annular surface of the winding; the oil flows to the rotor assembly under the action of gravity, enhancing the heat exchange effect of the rotor assembly, and all the cooling oil is finally collected by gravity to the return oil channel 14 and discharged from the oil outlet 16. The stator window-guided centripetal oil-cooled motor of the present invention achieves effective cooling of the rotor interior, the stator core, the stator end windings and the inner annular surface of the winding, effectively reducing the temperature rise of the motor stator core and windings, and improving the reliability of the motor. Furthermore, due to the staggered oil grooves on the surface of the core, the risk of sliding between the stator core and the casing is reduced, and the installation stability of the stator core is improved.

[0043] like Figure 4 , Figure 5 and Figure 6As shown, in this embodiment, the oil spray component 10 is a punching sheet stacking structure, and a plurality of obliquely arranged guide spray holes 101 are provided on the oil spray component 10. Taking into full consideration the complexity of punching sheet production, an oblique window-type oil spray through hole is opened near the outermost edge area of ​​the stator punching sheet to form an oil flow channel for spraying cooling oil on the end winding 5. After passing through the stator end punching sheet, the oil is sprayed to the end winding 5 through the oil spray component 10 with a guide structure to enhance the heat dissipation of the winding; the oil flows to the rotor assembly under the action of gravity to enhance the heat exchange effect of the rotor assembly. As shown Figure 7 and Figure 8 As shown, in other embodiments, the oil injection component 10 is a guide ring structure. The spraying effect on the end winding can be improved by adjusting the inclination angle and number of the guide spray holes 101, or other similar spray hole structures that are easy to process can be designed to save manufacturing costs. The oil injection component 10 can be made of metal or other materials to save manufacturing costs.

[0044] Furthermore, the guide spray holes 101 may be arranged in a single layer or multiple layers along the radial direction of the oil spray component 10. At the same time, the guide spray holes 101 may be evenly distributed or unevenly distributed along the circumference of the oil spray component 10 to improve the spraying effect.

[0045] In other embodiments, a directional nozzle or a guide vane may be installed in the guide spray hole 101 to achieve uniform spraying.

[0046] like Figure 2 , Fig. 9 and Fig.10 As shown, the stator sheet includes a first stator sheet 7 and a second stator sheet 11. A plurality of second stator sheet 11 stacks are stacked on both sides of the first stator sheet 7 stack. The length of each sheet stack can be changed as long as the total axial length of the stator core remains unchanged. The diameter of the first stator sheet 7 is smaller than the diameter of the second stator sheet 11. After the first stator sheet 7 is stacked, a circumferential annular space is formed between the outer side of the first stator sheet 7 and the inner side of the housing 6. The first stator sheet 7 stack corresponds to the oil inlet 8. The cooling oil input from the oil inlet 8 first enters the outer ring of the first stator sheet 7 to form an oil ring, and then flows and diffuses to the internal oil channel 9 formed by the outer ring of the second stator sheet 11 to cool the straight section of the stator core, and then is ejected from the oil injection component 10 with a window guide structure at a certain angle, and sprayed to the end winding 5 for cooling. The oil injection component 10 is provided with a window guide structure, which can prevent the oil from being sprayed out vertically from the punching sheet, thereby ensuring that the cooling oil is accurately sprayed to the end winding, thereby achieving the purpose of cooling the temperature of the end winding.

[0047] In other embodiments, oil storage channels may be provided at intervals in the circumferential direction of the first stator punching sheet 7 to achieve a more uniform distribution of the cooling oil in the circumferential direction of the first stator punching sheet 7 and improve the uniformity of the circumferential cooling.

[0048] like Figure 3 As shown, the outer periphery of the second stator punching sheet 11 is provided with a plurality of grooves 111, the grooves 111 are used as cooling oil passages, and the grooves 11 and the inner side of the housing 6 together enclose the internal oil passage 9. In this embodiment, the shape of the grooves 111 is square. In other embodiments, the grooves 111 may also be circular, semicircular, or fan-shaped.

[0049] In this embodiment, the adjacent overlapping sections of the stator punching sheets are overlapping and connected straight line sections or staggered sections, and no dead zone for oil flow is formed.

[0050] like Figure 2 As shown, the rotor assembly includes a hollow shaft 1 and a rotor core 13. The two ends of the hollow shaft 1 are rotatably connected to the front cover 61 and the rear cover 62 of the housing 6, respectively, and the connection between the hollow shaft 1 and the front cover 61 and the connection between the hollow shaft 1 and the rear cover 62 are both provided with sealed bearings 3. The rotor core 13 is fixed on the hollow shaft 1, and cover plates 4 are provided at both ends of the rotor core 13. The hollow shaft 1 drives the rotor core 13 to rotate inside the stator assembly.

[0051] like Figure 2 As shown, a shaft oil passage 2 is provided inside the hollow shaft 1, and an oil-slinging hole 12 is provided on the shaft oil passage 2, and a plurality of oil-slinging holes 12 are respectively located on both sides of the rotor core 13. The cooling oil input from the shaft oil passage 2 first cools the hollow shaft 1, and then is sprayed to the inner annular surface of the winding through the oil-slinging hole 12, so as to realize cooling of the end winding 5 and the inner annular surface of the winding.

[0052] In this embodiment, a shaft oil passage 2 with oil-swinging holes 12 is provided on the inner side of the hollow shaft 1, and the plurality of oil-swinging holes 12 are respectively located on both sides of the rotor core 13; the cooling oil in the shaft oil passage 2 flows through the inner surface of the hollow shaft 1 to cool the hollow shaft 1; and under the action of centrifugal force, the oil is spun from the oil-swinging ports 12 on both sides of the shaft oil passage 2 to the inner surface of the end winding 5 to cool the inner surface of the end winding 5, thereby enhancing the overall heat exchange of the winding. The stator window-guided centripetal oil-cooled motor of the present invention realizes all-round cooling from the inside to the outside, thereby improving the reliability of the motor.

[0053] In this embodiment, when the motor is running, cooling oil is input into the motor through the oil inlet 8, then flows through the straight channel or staggered channel formed by the slots of the stator punching sheets after stacking, and then sprayed from the window-type punching sheet spray holes at the end of the stator assembly to the end winding 5, taking away the heat generated by the end winding 5. The cooling oil in the hollow shaft 1 is thrown to the inner surface of the winding through the oil throwing hole 12 under the action of centrifugal force, and then collected at the bottom of the housing 6, and flows out of the motor through the oil return channel 14 and the oil outlet 16. The cooling oil circuits of the stator assembly and the rotor assembly are shown in FIG. Figure 2The stator window-guided centripetal oil-cooled motor of the present invention can effectively cool the stator core, stator end windings and the inner annular surface of the windings, reduce the temperature of the motor stator core and windings, solve the problem of excessive temperature rise in key parts such as the motor stator and rotor due to the increase in motor power density and unit volume heat generation, and ensure the safety and reliability of motor operation.

[0054] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A stator window-opening flow-guiding centripetal oil-cooled motor, characterized in that: include: A stator assembly, a rotor assembly, a housing (6) and an oil injection component (10) with a window guide structure; The stator assembly is composed of a stator core and a winding embedded in the stator core. The stator core is composed of a plurality of stator punching sheets stacked together. The outer circumference of the punching sheets is provided with oil holes. The inner circumference of the stator punching sheets is provided with winding wire embedding grooves. The winding wire embedding grooves of adjacent stacked sections are overlapped and aligned by stacking at a rotation angle. The oil holes of the stacked sections are interconnected to form an oil path. The stator assembly is fixed in the housing (6); a sealed cooling cavity (15) is formed between the outer periphery of the stator assembly, the outer periphery of the rotor assembly and the housing (6); the rotor assembly passes through the inner side of the stator assembly, and both ends are rotatably connected to the end covers of the housing (6); a rotating shaft oil passage (2) communicating with the cooling cavity (15) is provided on the inner side of the rotor assembly; an oil injection component (10) with a window guide structure is provided at the end of the stator assembly; an internal oil passage (9) formed on the outer circle of the stator core injects the oil into the oil injection components (10) at both ends of the stator core. 10) is connected to the cooling cavity (15); the housing (6) is provided with an oil inlet (8) and an oil outlet (16); the cooling oil inputted from the oil inlet (8) first flows through the internal oil passage (9) outside the stator assembly to disturb and cool the stator core, and then is guided by the oil spraying component (10) to be sprayed to the end winding (5) to cool the winding; the cooling oil inputted from the inner side of the rotor assembly first cools the inside of the rotor assembly, and then is sprayed to the inner annular surface of the winding, and the cooling oil is discharged through the oil outlet (16).

2. The stator window-opening flow-guiding centripetal oil-cooled motor according to claim 1, characterized in that: The oil injection component (10) is a punching sheet stack structure or a guide ring structure; the oil injection component (10) is provided with a plurality of inclined guide spray holes (101).

3. The stator window-guided centripetal oil-cooled motor according to claim 2, characterized in that: The flow-guiding spray holes (101) are arranged in a single layer or in multiple layers along the radial direction of the oil-injecting component (10), and the flow-guiding spray holes (101) are evenly distributed or non-evenly distributed along the circumference of the oil-injecting component (10).

4. The stator window-opening flow-guiding centripetal oil-cooled motor according to claim 2, characterized in that: A directional nozzle or a guide vane is installed in the guide spray hole (101).

5. The stator window-opening flow-guiding centripetal oil-cooled motor according to claim 2, characterized in that: The stator punching sheet comprises a first stator punching sheet (7) and a second stator punching sheet (11), a plurality of second stator punching sheet (11) stacked segments are respectively stacked on both sides of the first stator punching sheet (7), and the diameter of the first stator punching sheet (7) is smaller than the diameter of the second stator punching sheet (11), and the first stator punching sheet (7) stacking segment corresponds to an oil inlet (8), and the cooling oil input through the oil inlet (8) first enters the outer ring portion of the first stator punching sheet (7) to form an oil ring, and then flows and diffuses to the internal oil passage (9) formed by the outer ring of the second stator punching sheet (11) and the inner side of the housing (6), cooling the straight section of the stator core, and then ejected from the oil injection component (10) with a window guide structure at a certain angle, spraying to the end winding (5) position for cooling.

6. The stator window-opening flow-guiding centripetal oil-cooled motor according to claim 5, characterized in that: The first stator punching sheet (7) is provided with oil storage channels at intervals in the circumferential direction, so as to achieve uniform distribution of cooling oil in the circumferential direction of the first stator punching sheet (7).

7. The stator window-guided centripetal oil-cooled motor according to claim 5, characterized in that: The outer circumference of the second stator punching sheet (11) is provided with a plurality of grooves (111), the grooves (111) are used as cooling oil channels, and the shape of the grooves (111) is square, circular, semicircular or fan-shaped.

8. The stator window-guided centripetal oil-cooled motor according to claim 5, characterized in that: Adjacent overlapping sections of the stator punching sheets are overlapping and connected straight line sections or staggered sections.

9. The stator window-guided centripetal oil-cooled motor according to any one of claims 1 to 8, characterized in that: The rotor assembly comprises a hollow rotating shaft (1) and a rotor core (13); two ends of the hollow rotating shaft (1) are rotatably connected to a front cover (61) and a rear cover (62) of a casing (6), respectively; the rotor core (13) is fixed on the hollow rotating shaft (1); and the hollow rotating shaft (1) drives the rotor core (13) to rotate inside the stator assembly.

10. The stator window-opening flow-guiding centripetal oil-cooled motor according to claim 9, characterized in that: A shaft oil passage (2) is provided inside the hollow shaft (1), and an oil-spinning hole (12) is provided on the shaft oil passage (2). A plurality of the oil-spinning holes (12) are respectively located on both sides of the rotor core (13); cooling oil input from the shaft oil passage (2) first cools the hollow shaft (1), and then is sprayed onto the inner annular surface of the winding through the oil-spinning hole (12), so as to achieve cooling of the end winding (5) and the inner annular surface of the winding.

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