Centripetal spraying oil cooling stator and motor comprising same

Abstract

The invention discloses a centripetal spraying oil cooling stator and a motor comprising the same, the oil cooling stator comprises a stator iron core and a stator winding embedded in the stator iron core, the stator iron core is composed of an oil inlet lamination section, a circulation lamination section and a jet flow lamination section, the oil inlet lamination section is located in the middle of the stator iron core, and the jet flow lamination section is located at the end of the stator iron core. The circulation stacked section is located between the oil inlet stacked section and the jet flow stacked section, an oil inlet channel is formed in the oil inlet stacked section, a flowing channel is formed in the circulation stacked section, a flow guide channel and an oil spraying hole are formed in the jet flow stacked section, and the oil inlet channel, the flowing channel, the flow guide channel and the oil spraying hole communicate with one another; oil liquid cools the stator iron core in the circumferential direction through the oil inlet channel, the flowing channel and the flow guide channel and then is sprayed to the end portion of the stator winding from the oil spraying hole in a centripetal mode so as to cool the end portion winding. Winding installation grooves are distributed in the inner circles of the oil inlet lamination section, the circulation lamination section and the jet flow lamination section, and the winding installation grooves of the adjacent lamination sections coincide and are aligned. The device has the characteristics of compact structure, convenience in installation, high cooling efficiency and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of oil-cooled motors, and in particular to a centripetally sprayed oil-cooled stator and a motor comprising the same. Background Art

[0002] With the development of miniaturization and high power density of new energy vehicle motors, direct oil cooling can directly remove the heat inside the motor and significantly improve the power density of the motor compared to the traditional casing water cooling structure, and is gradually being widely used.

[0003] The windings and stator core areas of new energy permanent magnet motors generate the most heat. Existing oil-cooled motors used in passenger cars mostly require simultaneous cooling of the stator core and windings. A common oil cooling solution currently involves creating oil channels in the motor's stator core and installing oil spray rings (cylindrical, L-shaped, or other shapes) with oil spray holes at each end of the stator core. Oil first flows through the oil channels on the stator core for cooling, then collects in the oil spray ring cavities at both ends. The oil is then sprayed onto the windings through the oil spray holes on the rings, cooling the windings.

[0004] The problems of the existing technology are: 1) the fuel injection rings at both ends occupy the end space, and when the space at both ends is relatively compact, there is no installation space for the fuel injection rings; 2) the fuel injection rings are expensive; 3) if the lead wire adopts a busbar structure, it will affect the installation of the fuel injection rings.

[0005] To address these issues, existing technologies have employed a centripetal spray structure. This structure utilizes stacked, reciprocating laminations at both ends of the core to create a stepped channel, achieving the effect of tilted oil spray cooling the windings. However, this solution still has certain limitations: 1) The rotation angle of the stacked laminations forming the spray channel is limited by the stator slots, restricting the design of the spray holes; 2) the excessive number of reciprocating stacking cycles required to divert oil flow complicates the stator structure. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a centripetal spray oil-cooled stator and a motor containing the same, which has a compact structure, convenient assembly and disassembly, high stability and significant cooling effect, in response to the use requirements of closed passenger car oil-cooled motors.

[0007] In order to solve the above technical problems, the technical solution adopted by the present invention is: The stator core is cooled by the oil inlet channel, the oil inlet channel is provided with an oil channel, the oil channel is provided with an oil guide channel, and the oil channel is provided with an oil spray hole. The stator core is cooled by the oil inlet channel, the oil channel is provided with an oil channel, and the oil channel is provided with an oil channel. The stator core is cooled by the oil inlet channel, the oil channel is provided with an oil channel, and the oil channel is provided with an oil channel. The stator core is cooled by the oil inlet channel, the oil channel is provided with an oil channel, and the oil channel is provided with an oil channel.

[0008] As a further improvement of the present invention, the jet stack includes a first jet stack and a second jet stack, the second jet stack is located at the end of the stator core, the first jet stack is located between the flow stack and the second jet stack, and the second jet stack is provided with an oil spray hole, which is connected to the guide channel and faces the end of the stator winding. As a further improvement of the present invention, the first jet stack is formed by stacking several first jet punches, and the first jet punch is provided with several third oil holes and several fourth oil holes. The third oil holes are located inside the first jet punch, and the fourth oil holes are located at the edge of the first jet punch. The third oil holes or the fourth oil holes are connected to the oil spray hole. As a further improvement of the present invention, the third oil holes and the fourth oil holes are arranged alternately in groups of two. As a further improvement of the present invention, the third oil hole and the fourth oil hole are both T-shaped, rectangular, conical or triangular, and the third oil hole or the fourth oil hole is connected to the flow channel in the circumferential direction and to the oil injection hole in the radial direction. As a further improvement of the present invention, the oil inlet stack is formed by stacking a number of oil inlet punching sheets. As a further improvement of the present invention, the circulation stack is formed by stacking several circulation punches, the outer diameter of the circulation punch is larger than the outer diameter of the oil inlet punch, and the circulation punch is provided with several first oil holes and several second oil holes, the first oil holes are located inside the circulation punch, and the second oil holes are located at the edge of the circulation punch; the adjacent two circulation punches are rotated and stacked so that the circulation stack has flow channels that are staggered in the circumferential and radial directions and connected in the axial direction. As a further improvement of the present invention, the circulation stack is formed by stacking a plurality of circulation punches, the outer diameter of the circulation punches is larger than the outer diameter of the oil inlet punches, and a plurality of first oil holes are provided on the circulation punches. As a further improvement of the present invention, the oil inlet stack and the circulation stack are both formed by stacking a number of circulation punches, the edge of the circulation punch is provided with a first oil hole, and an annular groove is provided on the inner side of the casing for guiding the oil into the first oil hole for axial flow. As a general technical concept, the present invention further provides a motor comprising a housing, a rotor assembly, and the aforementioned centripetally sprayed oil-cooled stator, wherein the oil-cooled stator is fixed within the housing, the rotor assembly passes through the inner side of the oil-cooled stator, and its two ends are rotatably connected to the end covers of the housing, forming a cooling cavity between the oil-cooled stator, the rotor assembly, and the housing; the oil inlet channel, the flow channel, the guide channel, the oil spray hole, and the cooling cavity are interconnected to form an oil circuit; The shell is provided with an oil inlet and an oil outlet. The cooling oil inputted from the oil inlet first flows through the oil inlet channel, the flow channel and the guide channel in sequence to disturb and cool the stator core, and then is sprayed to the end of the stator winding through the oil spray hole to cool the winding, and the cooling oil is discharged through the oil outlet.

[0009] As a further improvement of the present invention, the rotor assembly includes a hollow rotating shaft, and a rotating shaft oil channel connected to the cooling cavity is provided on the inner side of the hollow rotating shaft; the cooling oil input into the inner side of the hollow rotating shaft first cools the inside of the hollow rotating shaft and then sprays onto the inner annular surface of the stator winding.

[0010] Compared with the prior art, the advantages of the present invention are: 1. The centripetally sprayed oil-cooled stator and the motor including the same of the present invention eliminate the need for an oil spray ring by providing a jet stack at the end of the stator core. The guide channel formed between the jet stack and the housing is utilized to achieve centripetal spraying of cooling oil to the end of the stator winding, thereby ensuring the cooling effect of the motor. On the one hand, the present invention eliminates the traditional oil spray ring, reduces the cost of the motor oil spray structure, and improves the compactness of the motor structure, which is conducive to promoting the miniaturization design of the motor; on the other hand, it can effectively cool the stator core, the stator winding end and the rotor assembly, reduce the temperature rise of the motor stator core and winding, and improve the reliability of the motor.

[0011] 2. The centripetal spray oil-cooled stator of the present invention and the motor containing the same are configured by arranging two spray stacks with different oil channel structures at the end of the stator core, wherein one spray stack guides the oil to flow downward, and the other spray stack guides the oil to flow axially. Through the reasonable design of the two spray stacks, the oil velocity vector is guided to be synthesized, and the oil is tilted centripetally when sprayed from the stator core and sprayed onto the stator winding, thereby simplifying the drainage design of the centripetal spray at the end of the stator core. There is no need to repeatedly rotate and stack to form a complex stepped channel, and the production of the stator core is simpler. At the same time, the spray structure is freer and is no longer limited by the number of slots when the punching sheets are rotated and stacked. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 Schematic diagram of the structural principle of the motor in specific embodiment 1 of the present invention; Figure 2 Schematic diagram of the structural principle of the centripetal spray oil-cooled stator in specific embodiment 1 of the present invention; Figure 3 Schematic diagram of the structural principle of the stator core in specific embodiment 1 of the present invention; Figure 4 This is a schematic diagram of the structural principle of the oil inlet punch in the specific embodiment 1 of the present invention; Figure 5 This is a schematic diagram of the structural principle of the circulation punch in the specific embodiment 1 of the present invention; Figure 6 Schematic diagram of a partial structure of the flow channels in specific embodiment 1 of the present invention; wherein, Figure (a) shows that the oil flow channels are staggered in the circumferential direction, and Figure (b) shows that the oil flow channels are staggered in the radial direction; Figure 7 This is a schematic diagram of the structural principle of the first jet punching sheet in specific embodiment 1 of the present invention; Figure 8 Schematic diagram of the structural principle of the second jet punching sheet in specific embodiment 1 of the present invention; Figure 9 This is a schematic diagram of the inclined flow diversion at the end of the stator core in the specific embodiment 1 of the present invention; Figure 10 Schematic diagram of the oil flow path in specific embodiment 1 of the present invention; Figure 11 This is a schematic diagram of the structural principle of the circulation punch in the specific embodiment 2 of the present invention; Figure 12 This is a schematic diagram of the structural principle of the oil inlet punch in specific embodiment 3 of the present invention; Figure 13 Schematic diagram of the structural principle of the stator core in specific embodiment 3 of the present invention; Legend: 1. Oil inlet; 2. Oil outlet; 3. Stator core; 4. Stator winding; 5. Housing; 6. Bearing; 7. Hollow shaft; 8. Rotor assembly; 9. Shaft oil channel; 10. Cooling cavity; 11. Rotor core; 101. Oil inlet channel; 102. Flow channel; 103. Guide channel; 31. Oil inlet stack; 32. Circulation stack; 33. First jet stack; 34. Second jet stack; 35. Winding mounting slot; 310. Oil inlet punching plate; 320. Circulation punching plate; 321. First oil hole; 322. Second oil hole; 330. First jet punching plate; 331. Third oil hole; 332. Fourth oil hole; 340. Second jet punching plate; 341. Oil spray hole. DETAILED DESCRIPTION

[0013] The present invention will be further described below in conjunction with the accompanying drawings and specific preferred embodiments, but the scope of protection of the present invention is not limited thereby.

[0014] 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 to 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, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0015] 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.

[0016] Example 1 like Figures 1 to 10 As shown in FIG. 1 , the oil-cooled stator of the present invention is installed in a motor. The motor includes a housing 5, an oil-cooled stator and a rotor assembly 8. The oil-cooled stator is composed of a stator core 3 and a stator winding 4 embedded in the stator core 3. Figure 2 As shown. Figure 3 As shown, the stator core 3 consists of an oil inlet stack 31, a flow stack 32, and a jet stack. The oil inlet stack 31 is located in the middle of the stator core 3, the jet stack is located at the end of the stator core 3, and the flow stack 32 is located between the oil inlet stack 31 and the jet stack. Oil holes are circumferentially distributed on the outer circumference of the oil inlet stack 31, the flow stack 32, and the jet stack. Winding mounting slots 35 are distributed on the inner circumference of the oil inlet stack 31, the flow stack 32, and the jet stack. The winding mounting slots 35 of adjacent stacks overlap and align. It will be understood that the length of each punching stack in the stator core 3 can be varied, and the total number of stacked segments can also be varied.

[0017] The oil-cooled stator is fixed in the shell 5, the rotor assembly 8 passes through the inner side of the oil-cooled stator, and the two ends are rotatably connected to the end covers of the shell 5. A cooling cavity 10 is formed between the oil-cooled stator, the rotor assembly 8 and the shell 5; an oil inlet channel 101 is formed between the oil inlet stack 31 and the shell 5, a flow channel 102 is formed between the circulation stack 32 and the shell 5, and a guide channel 103 is formed between the jet stack and the shell 5. The oil inlet channel 101, the flow channel 102, the guide channel 103 and the cooling cavity 10 are interconnected to form an oil circuit. like Figure 1 As shown, an oil inlet 1 and an oil outlet 2 are provided on opposite sides of the housing 5. The cooling oil input through the oil inlet 1 first flows through the oil inlet channel 101 and the flow channel 102 in sequence to disturb and cool the stator core 3, and then is sprayed to the end of the stator winding 4 through the guide channel 103 to cool the winding. After the winding dissipates heat, the cooling oil drips onto the rotor assembly 8 under the action of gravity to cool the rotor assembly 8, and then gathers at the bottom of the housing 5 under the action of gravity and is discharged through the oil outlet 2.

[0018] In this embodiment, by providing a jet stack at the end of the stator core 3, the provision of an oil spray ring is eliminated, and the guide channel formed between the jet stack and the housing 5 is utilized to achieve centripetal spraying of cooling oil to the end of the stator winding 4, thereby ensuring the cooling effect of the motor. On the one hand, the present invention eliminates the traditional oil spray ring, reduces the cost of the motor oil spray structure, and improves the compactness of the motor structure, which is conducive to promoting the miniaturization design of the motor; on the other hand, it can effectively cool the stator core 3, the end of the stator winding 4 and the rotor assembly 8, thereby reducing the temperature rise of the motor stator core and winding, and improving the reliability of the motor.

[0019] like Figure 3 and Figure 4 As shown, the oil inlet stack 31 is formed by stacking a number of oil inlet punches 310. The outer diameter of the oil inlet punches 310 is smaller than the inner diameter of the housing 5. In this embodiment, a circumferential annular space, namely, an oil inlet channel 101, is formed between the outer diameter of the oil inlet stack 31 and the inner diameter of the housing 5. Cooling oil flows from the oil inlet 1 into this circumferential annular space to form a circumferential oil ring. The oil inlet channel 101 is connected to the flow channel 102 on the circulation stack 32. The cooling oil then flows to both sides of the flow channel 102 to cool the stator core 3. The cooling oil further passes through the guide channel 103 and is sprayed obliquely onto the end of the stator winding 4 to cool the stator winding 4.

[0020] like Figure 3 、 Figure 5 and Figure 6As shown, the flow stack 32 is formed by stacking a plurality of flow punches 320. The outer diameter of the flow punches 320 is equal to the inner diameter of the housing 5. The flow punches 320 are provided with a plurality of first oil holes 321 and a plurality of second oil holes 322. The first oil holes 321 are located inside the flow punches 320, and the second oil holes 322 are located at the edges of the flow punches 320. Adjacent flow punches 320 are rotated and stacked to form flow channels 102 between the flow stack 32 and the housing 5, which are staggered in the circumferential and radial directions and connected in the axial direction. In this embodiment, the circulation punch 320 has a channel for cooling oil circulation near the outer circumference, and the channel is divided circumferentially. One portion has a toothed edge structure, namely, the second oil holes 322, through which the oil flows between the teeth, and another portion has oil holes inside the punch, namely, the first oil holes 321, through which the oil flows. By rationally designing the edge teeth and oil holes of the circulation punch 320 and simply rotating and laminating the circulation punch 320, a flow channel 102 is obtained that is staggered in the circumferential and radial directions and connected in the axial direction.

[0021] It is understood that the number of flow punches 320 in the flow stack 32 can be varied, as long as there is overlap between adjacent punch stacks to prevent dead zones in the oil flow. For example, the flow channel 102 can be formed by stacking multiple types of punches, with some stacks having circular oil holes and some having square oil holes.

[0022] like Figure 3 As shown, the jet stack includes a first jet stack 33 and a second jet stack 34. The second jet stack 34 is located at the end of the stator core 3, and the first jet stack 33 is located between the flow stack 32 and the second jet stack 34. Figure 8 As shown, the second jet stack 34 is provided with an oil injection hole 341 , which is communicated with the flow guide channel 103 and faces the end of the stator winding 4 .

[0023] like Figure 7 As shown, the first jet stack 33 is formed by stacking a plurality of first jet punches 330. The first jet punches 330 are provided with a plurality of third oil holes 331 and a plurality of fourth oil holes 332. The third oil holes 331 are located within the first jet punches 330, and the fourth oil holes 332 are located at the edge of the first jet punches 330. Either the third oil holes 331 or the fourth oil holes 332 communicate with the oil injection holes 341. Furthermore, the third oil holes 331 and the fourth oil holes 332 are arranged alternately in pairs.

[0024] Furthermore, the third oil hole 331 and the fourth oil hole 332 both have a T-shaped structure. The third oil hole 331 or the fourth oil hole 332 communicates circumferentially with the flow channel 102 and radially with the oil injection hole 341. The oil injection hole 341 can be a rectangular hole, while the third oil hole 331, the fourth oil hole 332, and the oil injection hole 34 can also be circular, square, triangular, waist-shaped, or other shaped holes. The oil injection holes 341 can be evenly distributed or unevenly distributed circumferentially, and the third oil holes 331 or the fourth oil holes 332 can also be evenly or unevenly distributed circumferentially.

[0025] In this embodiment, the oil is sprayed obliquely to the stator winding 4 through the guide channel 103. The principle is that the oil channel at the end of the stator core 3 forms the following Figure 9 In the structure shown, the oil first flows axially in the third oil hole 331 or the fourth oil hole 332. After passing through the third oil hole 331 or the fourth oil hole 332, the oil has a radial velocity radially toward the axis; then the oil obtains an axial velocity component through the oil injection hole 341. Since the radial and axial distances of the guide channel 103 are small, that is, the radial and axial flow distances are very short, the oil flow cannot fully develop in the radial and axial directions, so a velocity vector in an oblique direction can be synthesized. Furthermore, by adjusting the length of the first jet stack 33 and the second jet stack 34, the size of the third oil hole 331 or the fourth oil hole 332, and the size of the oil injection hole 341, the direction of the velocity vector when the oil is sprayed can be adjusted, and the oil can therefore be sprayed obliquely onto the stator winding 4, as shown in FIG. Figure 10 In this embodiment, the stator core ends do not use stepped oil channels for drainage. Instead, velocity vector synthesis is used to achieve an inclined spraying effect. The first and second jet stacks 33 and 34 at the ends of the stator core 3 do not need to be rotated and stacked to form the drainage channel, thus providing greater freedom in spray design.

[0026] In this embodiment, two spray stacks with different oil channel structures are provided at the end of the stator core 3, wherein one spray stack guides the oil to flow downward, and the other spray stack guides the oil to flow axially. Through the reasonable design of the two spray stacks, the oil velocity vector is guided to be synthesized, and the oil is tilted toward the centripetal when sprayed from the stator core 3 and sprayed onto the stator winding 4, thereby simplifying the drainage design of the centripetal spray at the end of the stator core 3. There is no need to repeatedly rotate and stack to form a complex stepped channel, and the production of the stator core 3 is simpler. At the same time, the spray structure is freer and is no longer limited by the number of slots when the punching sheets are rotated and stacked.

[0027] like Figure 1As shown, the rotor assembly 8 includes a hollow shaft 7 and a rotor core 11. The rotor core 11 is nested on the hollow shaft 7 and located inside the oil-cooled stator. The two ends of the hollow shaft 7 are connected to the end caps of the housing 5 via bearings 6. The inside of the hollow shaft 7 is provided with a shaft oil passage 9 that communicates with the cooling cavity 10, and the hollow shaft 7 is circumferentially provided with oil-spinning holes. When the motor is running, the cooling oil input into the inside of the hollow shaft 7 first cools the inside of the hollow shaft 7, and then sprays onto the inner annular surface of the stator winding 4 through the oil-spinning holes, enhancing the heat exchange effect of the inner annular surface of the stator winding 4. The cooling oil then collects at the bottom of the motor.

[0028] In this embodiment, the cooling of the motor is achieved in the following way: when the motor is running, the cooling oil is input into the housing 5 through the oil inlet 1, and then flows through the stator punching sheet stacked after the stator is formed, that is, the oil inlet channel 101 and the flow channel 102, and is sprayed to the end of the stator winding 4 through the guide channel 103 provided on the stator core 3, taking away the heat generated by the end winding. At the same time, the cooling oil introduced into the hollow shaft 7 is sprayed to the inner ring of the stator winding 4 through the oil-throwing hole under the action of centrifugal force, and then collected at the bottom of the housing 5, and discharged from the motor through the oil return channel and the oil outlet 2. The cooling oil circuit is as follows Figure 1 The path is shown by the arrow in the middle.

[0029] Example 2 like Figure 11 As shown, the centripetally sprayed oil-cooled stator of the present invention has a similar structural arrangement and operating principle to the oil-cooled motor of Example 1, differing primarily in that the flow stack 32 is formed by stacking a plurality of flow punches 320. The outer diameter of each flow punch 320 is equal to the inner diameter of the housing 5, and each flow punch 320 is provided with a plurality of first oil holes 321. Because only one type of first oil hole 321 is provided on each flow punch 320, the flow punches 320 do not need to be staggered or partitioned. The first oil holes 321 can be square, round, trapezoidal, or waist-shaped, among other shapes.

[0030] Example 3 like Figure 12 and Figure 13 As shown, the centripetally sprayed oil-cooled stator of the present invention has a similar structural arrangement and working principle to the oil-cooled motor in Example 1, with the main difference being that the oil inlet stack 31 and the circulation stack 32 are both formed by stacking a plurality of circulation punches 320, the edge of the circulation punch 320 is provided with a first oil hole 321, and an annular groove is provided on the inner side of the casing 5 for guiding the oil into the first oil hole 321 for axial flow, and finally converging and spraying on the stator winding 4.

[0031] In this embodiment, the first oil hole 321 may adopt a wedge-shaped structure, such as Figure 12 In other embodiments, the first oil hole 321 may also be in a square, rectangular, semicircular or other shapes.

[0032] like Figure 13 As shown, in this embodiment, the stator core 3 is composed of three types of stator punchings, which simplifies the structural design of the stator punchings while still ensuring the cooling and heat dissipation requirements of the motor.

[0033] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiment. All technical solutions based on the concept of the present invention are within the scope of protection of the present invention. It should be noted that for those skilled in the art, various improvements and modifications that do not depart from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A centripetal spray oil-cooled stator, characterized in that: The invention comprises a stator core (3) and a stator winding (4) embedded in the stator core (3), wherein the stator core (3) is composed of an oil inlet stack (31), a flow stack (32) and a jet stack, wherein the oil inlet stack (31) is located in the middle of the stator core (3), the jet stack is located at the end of the stator core (3), and the flow stack (32) is located between the oil inlet stack (31) and the jet stack, wherein the oil inlet stack (31) is provided with an oil inlet channel (101), the flow stack (32) is provided with a flow channel (102), and the jet stack is provided with a flow guide channel (103) and an oil jetting channel. The oil inlet channel (101), the flow channel (102), the guide channel (103) and the oil spray hole (341) are interconnected to form an oil circuit. The oil cools the stator core (3) circumferentially through the oil inlet channel (101), the flow channel (102) and the guide channel (103), and then is sprayed centripetally to the end of the stator winding (4) through the oil spray hole (341) to cool the end winding. Winding mounting grooves (35) are distributed on the inner circles of the oil inlet stack (31), the flow stack (32) and the spray stack, and the winding mounting grooves (35) of adjacent stacks are overlapped and aligned.

2. The centripetal spray oil-cooled stator according to claim 1, characterized in that: The jet stack comprises a first jet stack (33) and a second jet stack (34), wherein the second jet stack (34) is located at the end of the stator core (3), and the first jet stack (33) is located between the flow stack (32) and the second jet stack (34). The second jet stack (34) is provided with an oil injection hole (341), and the oil injection hole (341) is communicated with the guide channel (103) and faces the end of the stator winding (4).

3. The centripetal spray oil-cooled stator according to claim 2, characterized in that: The first jet stack (33) is formed by stacking a plurality of first jet punches (330). The first jet punches (330) are provided with a plurality of third oil holes (331) and a plurality of fourth oil holes (332). The third oil holes (331) are located inside the first jet punch (330), and the fourth oil holes (332) are located at the edge of the first jet punch (330). The third oil holes (331) or the fourth oil holes (332) are connected to the oil injection hole (341).

4. The centripetal spray oil-cooled stator according to claim 3, characterized in that: The third oil holes (331) and the fourth oil holes (332) are arranged alternately in groups of two.

5. The centripetally sprayed oil-cooled stator according to claim 3, characterized in that: The third oil hole (331) and the fourth oil hole (332) are both T-shaped, rectangular, conical, or triangular. The third oil hole (331) or the fourth oil hole (332) is connected to the flow channel (102) in the circumferential direction and is connected to the oil injection hole (341) in the radial direction.

6. The centripetally sprayed oil-cooled stator according to claim 3, characterized in that: The oil inlet stack (31) is formed by stacking a plurality of oil inlet punching sheets (310).

7. The centripetally sprayed oil-cooled stator according to claim 6, characterized in that: The circulation stack (32) is formed by stacking a plurality of circulation punches (320), wherein the outer diameter of the circulation punches (320) is larger than the outer diameter of the oil inlet punches (310), and the circulation punches (320) are provided with a plurality of first oil holes (321) and a plurality of second oil holes (322), wherein the first oil holes (321) are located inside the circulation punches (320), and the second oil holes (322) are located at the edge of the circulation punches (320); two adjacent circulation punches (320) are rotated and stacked, so that the circulation stack (32) has flow channels (102) that are staggered in the circumferential and radial directions and connected in the axial direction.

8. The centripetally sprayed oil-cooled stator according to claim 3, characterized in that: The circulation stack (32) is formed by stacking a plurality of circulation punches (320). The outer diameter of the circulation punches (320) is greater than the outer diameter of the oil inlet punches (310). The circulation punches (320) are provided with a plurality of first oil holes (321).

9. The centripetally sprayed oil-cooled stator according to claim 3, characterized in that: The oil inlet stack (31) and the circulation stack (32) are both formed by stacking a plurality of circulation punches (320). The edges of the circulation punches (320) are provided with first oil holes (321) for guiding oil into the first oil holes (321) for axial flow.

10. A motor, characterized in that: The invention comprises a housing (5), a rotor assembly (8) and a centripetally sprayed oil-cooled stator according to any one of claims 1 to 9, wherein the oil-cooled stator is fixed in the housing (5), the rotor assembly (8) passes through the inner side of the oil-cooled stator, and both ends are rotatably connected to the end covers of the housing (5), and a cooling cavity (10) is formed between the oil-cooled stator, the rotor assembly (8) and the housing (5); the oil inlet channel (101), the flow channel (102), the guide channel (103), the oil spray hole (341) and the cooling cavity (10) are interconnected to form an oil circuit; The housing (5) is provided with an oil inlet (1) and an oil outlet (2). The cooling oil inputted from the oil inlet (1) first flows sequentially through the oil inlet channel (101), the flow channel (102) and the guide channel (103) to disturb and cool the stator core (3), and then is sprayed through the oil spray hole (341) to the end of the stator winding (4) to cool the winding, and the cooling oil is discharged through the oil outlet (2).

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