Stator cooling structure and motor

Abstract

The utility model provides a stator cooling structure and a motor, which belong to the technical field of motor heat dissipation and comprise a motor shell, a stator core, an annular oil plate and an oil injection ring. The stator cooling structure provided by the utility model can uniformly and circumferentially cool the whole stator core and the end windings, thereby improving the heat dissipation efficiency of the motor and avoiding the problem of overhigh local temperature rise. While the cooling effect is ensured, the diameter of the iron core is reduced, and the overall weight of the motor is reduced. The temperature rise of the winding in the iron core and the temperature of the stator iron core are effectively reduced, and the problem of over-high local temperature rise is avoided. Therefore, the cooling oil can be intensively acted on key parts, the cooling efficiency is improved, and the temperatures of the winding front end, the winding rear end and the stator core are effectively reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to motor heat dissipation technical field, more specifically, relate to a stator cooling structure and motor. BACKGROUND

[0002] The oil-cooled motor is internally provided with one or more oil pumps to pump lubricating oil into the motor to form oil circulation. When the motor generates a large amount of heat, the heat is absorbed and carried away by the oil, thereby effectively reducing the temperature inside the motor and ensuring normal operation of the motor. Meanwhile, the oil can also lubricate and cool other components, thereby improving the operating performance of the entire motor.

[0003] The existing oil-cooled motor is designed with an ear-shaped core and an oil injection ring is added above the core to inject oil. However, this structure can only directly cool the upper part of the core and the winding, and cannot directly cool the lower part of the core and the winding. The cooling oil in the upper half of the motor can only flow downward to cool the lower half of the winding, which can cause local overheating and uneven temperature distribution. Moreover, the size of the core and the shell is large, and the overall weight is heavy. SUMMARY

[0004] The utility model discloses a stator cooling structure which can uniformly cool the entire stator core and the end winding in the circumferential direction, thereby improving the heat dissipation efficiency of the motor and avoiding local overheating.

[0005] To achieve the above-mentioned purpose, the utility model adopts the technical scheme of providing a stator cooling structure, comprising:

[0006] A motor shell is provided with an oil inlet pipe.

[0007] A stator core is arranged inside the motor shell, and a cooling channel is formed between the stator core and the motor shell.

[0008] An annular oil plate is arranged at the front end of the stator core and surrounds the outer periphery of the front end of the winding. A first cooling chamber is formed between the annular oil plate and the motor shell, which communicates with the oil inlet pipe and the cooling channel. A plurality of first oil injection holes are formed in the circumferential direction of the annular oil plate and communicate with the first cooling chamber.

[0009] An oil injection ring is arranged at the rear end of the stator core and surrounds the outer periphery of the rear end of the winding. A second cooling chamber is arranged in the oil injection ring and communicates with the cooling channel. A plurality of second oil injection holes are formed in the circumferential direction of the oil injection ring and communicate with the second cooling chamber.

[0010] In one possible implementation, the stator core comprises:

[0011] The first punch is provided with a plurality of axial through grooves on the outer periphery, and a first cooling oil channel is formed between the plurality of axial through grooves and the motor shell, and the first cooling oil channel is communicated with the first cooling chamber, and the annular oil plate is arranged at the front end of the first punch;

[0012] The second punch is arranged at the rear end of the first punch, and a second cooling oil channel is formed between the circumferential direction of the second punch and the motor shell;

[0013] The third punch is arranged at the rear end of the second punch, and a plurality of axial through holes are formed on the circumferential direction of the third punch, and a third cooling channel is formed by the plurality of axial through holes, and the third cooling channel is communicated with the second cooling chamber;

[0014] The first cooling oil channel, the second cooling oil channel and the third cooling channel are sequentially communicated to form the cooling oil channel, so that the winding temperature rise and the stator core temperature inside the core are effectively reduced, and the problem of local temperature rise being too high is avoided.

[0015] In a possible implementation, the outer periphery of the third punch is provided with a plurality of connecting lugs, and a plurality of first axial connecting members are arranged on the connecting lugs, and the plurality of first axial connecting members are used to fix the third punch to the motor shell, so that the entire stator core is stably installed inside the electronic shell.

[0016] In a possible implementation, the front end of the outer wall of the annular oil plate is sealingly attached to the inner wall of the motor shell, the rear end of the outer wall of the annular oil plate and the inner wall of the motor shell form the first cooling chamber, and the rear end surface of the annular oil plate is sealingly attached to the front end surface of the stator core, thereby further increasing the sealing performance of the annular oil plate, the motor shell and the stator core.

[0017] In a possible implementation, the rear end surface of the annular oil plate is provided with a plurality of positioning claws, and the plurality of positioning claws are clamped in the circumferential direction of the outer wall of the stator core, so as to realize the stability of the connection between the annular oil plate and the stator core.

[0018] In a possible implementation, the first oil injection hole is inclined from the outside to the inside towards the front side, so as to better cool the front end of the winding.

[0019] In a possible implementation, the rear end surface of the oil injection ring is provided with a plurality of mounting recesses in the circumferential direction, and a second axial connecting member is arranged on the mounting recess, and the plurality of second axial connecting members are used to fix the oil injection ring to the rear end of the stator core, so as to effectively avoid the problems of installation deviation or looseness caused by uneven force, and ensure that the oil injection ring is closely attached to the stator core.

[0020] In a possible implementation, the inner wall of the oil injection ring is circumferentially provided with a plurality of oil guide teeth, the plurality of oil guide teeth are one-to-one correspondingly arranged at the rear side of the plurality of second oil injection holes, and the front side surface of the oil guide teeth is provided with a guide inclined surface inclined from the outside to the inside and to the rear side, so that the cooling oil can be concentrated on the key position, the cooling efficiency is improved, and the temperature of the rear end of the winding is effectively reduced.

[0021] In a possible implementation, the number of the second oil injection holes located at the upper part of the oil injection ring is greater than the number of the second oil injection holes located at the lower part of the oil injection ring, so that the cooling oil flowing out of the upper part of the oil injection ring and the lower part of the oil injection ring can achieve the effect of equal amount, and the uniformity of the cooling of the rear end of the winding is ensured.

[0022] The stator cooling structure has the advantages that, compared with the prior art, the cooling oil enters the first cooling chamber formed by the annular oil plate and the motor shell from the oil inlet pipe of the motor shell, part of the cooling oil flows out through the plurality of first oil injection holes for circumferentially uniformly cooling the front end of the winding, another part of the cooling oil flows through the cooling channel formed between the stator core and the motor shell for circumferentially uniformly cooling the stator core, the cooling oil flowing through the cooling channel enters the second cooling chamber of the oil injection ring, and finally flows out through the plurality of second oil injection holes for circumferentially uniformly cooling the rear end of the winding. The stator cooling structure can uniformly circumferentially cool the entire stator core and the end winding, improves the heat dissipation efficiency of the motor, and avoids the problem of excessively high local temperature rise.

[0023] The application further provides a motor comprising the stator cooling structure.

[0024] The motor has the advantages that, compared with the prior art, since the motor uses the above stator cooling structure, the motor has the same advantages as the stator cooling structure, which will not be repeated here. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort.

[0026] Figure 1 FIG. 1 is a perspective view of a stator cooling structure according to the present application;

[0027] Figure 2 FIG. 2 is a sectional view of the stator cooling structure according to the present application;

[0028] Figure 3The utility model provides a stereogram of the stator core;

[0029] Figure 4 For Figure 2 The partial close -up view at M;

[0030] Figure 5 For Figure 2 The partial close -up view at N;

[0031] Figure 6 The utility model provides a stereogram of the annular oil plate;

[0032] Figure 7 The utility model provides a stereogram of the oil injection ring;

[0033] Figure 8 The utility model provides a partial schematic view of the oil injection ring after removing the cover plate.

[0034] In the figure,

[0035] 100, motor housing;110, oil inlet pipe;120, winding front end;130, winding rear end;200, stator core;210, first punching sheet;211, first cooling oil channel;220, second punching sheet;221, second cooling oil channel;230, third punching sheet;231, third cooling channel;240, connecting lug;241, first axial connecting piece;300, annular oil plate;310, first cooling chamber;320, first sealing ring;330, second sealing ring;340, first oil injection hole;350, positioning claw;400, oil injection ring;410, second cooling chamber;420, second oil injection hole;430, mounting recess;431, second axial connecting piece;440, oil guide tooth;441, guide inclined surface;450, oil inlet. DETAILED DESCRIPTION

[0036] In order to make the technical problem, technical scheme and beneficial effect that the utility model wants to solve more clearly clear, the following is combined with the embodiment, and the utility model is further detailedly explained.It should be understood that the specific embodiment described here is only used to explain the utility model, and is not used to limit the utility model.

[0037] Unless otherwise explicitly defined, such as using the term "first", "second" or "third", all are for distinguishing different objects, and are not used to describe specific order.

[0038] Unless otherwise clearly indicated, the orientation terms such as "central", "transverse", "longitudinal", "horizontal", "vertical", "top", "bottom", "inner", "outer", "upper", "lower", "front", "back", "left", "right", "clockwise", "counterclockwise", "high", "low", etc. indicate the orientation or positional relationship based on the orientation and positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation or be constructed and operated in a particular orientation, so it cannot be understood as limiting the specific protection scope of the utility model.

[0039] Please refer to Figure 1 and Figure 2 A kind of stator cooling structure provided by the utility model will be described now.A kind of stator cooling structure, including motor shell 100, stator core 200, annular oil plate 300 and oil injection ring 400.Oil inlet pipe 110 is provided on motor shell 100;Stator core 200 is arranged in the inside of motor shell 100, and cooling channel is formed between stator core 200 and motor shell 100;Annular oil plate 300 is arranged at the front end of stator core 200 and surrounds the outer periphery of winding front end 120, and first cooling chamber 310 that is communicated with oil inlet pipe 110 and cooling channel is formed between annular oil plate 300 and motor shell 100, and a plurality of first oil injection holes 340 that are communicated with first cooling chamber 310 are opened in the circumferential direction of annular oil plate 300;Oil injection ring 400 is arranged at the rear end of stator core 200 and surrounds the outer periphery of winding rear end 130, and second cooling chamber 410 that is communicated with cooling channel is arranged in oil injection ring 400, and a plurality of second oil injection holes 420 that are communicated with second cooling chamber 410 are opened in the circumferential direction of oil injection ring 400.

[0040] Compared with the prior art, the stator cooling structure provided by the utility model, cooling oil enters first cooling chamber 310 formed by annular oil plate 300 and motor shell 100 from oil inlet pipe 110 of motor shell 100, a part of the cooling oil flows out through a plurality of first oil injection holes 340 for circumferentially uniformly cooling winding front end 120, another part of the cooling oil flows through the cooling channel formed between stator core 200 and motor shell 100 for circumferentially uniformly cooling stator core 200, the cooling oil flowing through the cooling channel enters second cooling chamber 410 of oil injection ring 400, and finally flows out through a plurality of second oil injection holes 420 for circumferentially uniformly cooling winding rear end 130.The stator cooling structure provided by the utility model can circumferentially uniformly cool the entire stator core 200 and end winding, improve the heat dissipation efficiency of the motor, and avoid the problem of excessively high local temperature rise.

[0041] Please refer to Figure 3The stator core 200 comprises a first punching sheet 210, a second punching sheet 220 and a third punching sheet 230. The first punching sheet 210 accounts for the main part, and the thickness of the first punching sheet 210 is at least three times greater than the sum of the thicknesses of the second punching sheet 220 and the third punching sheet 230, and the three punching sheets are fixed by laminating and bonding. The first punching sheet 210, the second punching sheet 220 and the third punching sheet 230 are all disc structures and have the same inner hole structure.

[0042] The first punching sheet 210 is provided with a plurality of axial through grooves, and the plurality of axial through grooves and the motor shell 100 form a first cooling oil channel 211, the first cooling oil channel 211 is communicated with a first cooling chamber 310, and an annular oil plate 300 is arranged at the front end of the first punching sheet 210. When the first punching sheet 210 is assembled with the motor shell 100, the first cooling oil channel 211 is formed between the axial through grooves and the motor shell 100. Since the first punching sheet 210 accounts for the main part of the core, the contact area of the first cooling oil channel 211 with the core is large, and the heat generated by the core can be fully taken away. Moreover, the outer circular oil channel of the punching sheet is designed as a through groove, which reduces the diameter size of the core and the overall weight of the motor while ensuring the cooling effect.

[0043] The second punching sheet 220 is arranged at the rear end of the first punching sheet 210, and the circumferential direction of the second punching sheet 220 and the motor shell 100 form a second cooling oil channel 221. The second punching sheet 220 is arranged at the rear end of the first punching sheet 210, and the outer diameter of the second punching sheet 220 is smaller than that of the first punching sheet 210 and is not slotted. The circumferential direction of the second punching sheet 220 and the motor shell 100 form a second cooling oil channel 221, which plays a role of connecting the first cooling oil channel 211 and the third cooling oil channel 231 in the cooling oil channel system. The cooling oil flowing from the first cooling oil channel 211 will then enter the second cooling oil channel 221 and further circulate in the motor to continuously cool the inside of the motor.

[0044] The third punching sheet 230 is arranged at the rear end of the second punching sheet 220, and the circumferential direction of the third punching sheet 230 is provided with a plurality of axial through holes, and the plurality of axial through holes form a third cooling channel 231. The third punching sheet 230 is located at the rear end of the second punching sheet 220, and the circumferential direction of the third punching sheet 230 is provided with a plurality of axial through holes, and the plurality of axial through holes jointly form a third cooling channel 231. The third cooling channel 231 is communicated with the second cooling oil channel 221 of the second punching sheet 220 and a second cooling chamber 410 of an oil injection ring 400, and the cooling oil collected at the second cooling oil channel 221 will flow into the second cooling chamber 410 of the right end oil injection ring 400 through the third cooling channel 231 formed by the plurality of axial through holes of the third punching sheet 230.

[0045] Finally, the first cooling oil channel 211, the second cooling oil channel 221 and the third cooling channel 231 are communicated in sequence to form a cooling oil channel, through which the cooling oil can directly cool the stator core 200 and the end winding, greatly improving the heat dissipation efficiency of the motor, effectively reducing the winding temperature rise in the core and the temperature of the stator core 200, avoiding the problem of local over-temperature, ensuring that the motor can stably and reliably operate, and improving the performance of the motor.

[0046] Preferably, the outer periphery of the third punching sheet 230 is provided with a plurality of connecting lugs 240, and a plurality of first axial connecting members 241 are arranged on the connecting lugs 240, which are used to fix the third punching sheet 230 to the motor shell 100. The plurality of connecting lugs 240 are integrally formed on the outer periphery of the third punching sheet 230 and extend outward in the radial direction, and the connecting lugs 240 are provided with through holes extending in the axial direction. The first axial connecting member 241 is a connecting bolt which penetrates through the corresponding through hole and is screwed into the reserved threaded hole in the inner cavity of the motor shell 100, so as to stably install the entire stator core 200 inside the motor shell 100.

[0047] Please refer to Figure 2 , Figure 4 and Figure 6 , the outer wall front end of the annular oil plate 300 is sealingly attached to the inner wall of the motor shell 100, and the outer wall front end of the annular oil plate 300 is provided with an annular groove in the circumferential direction, and the first sealing ring 320 is arranged in the annular groove, further increasing the sealing performance of the outer wall front end of the annular oil plate 300 and the inner wall of the motor shell 100. The first cooling chamber 310 is formed between the outer wall rear end of the annular oil plate 300 and the inner wall of the motor shell 100, and the rear end face of the annular oil plate 300 is sealingly attached to the front end face of the stator core 200. The rear end face of the annular oil plate 300 is also provided with an annular groove in the circumferential direction, and the second sealing ring 330 is arranged in the annular groove, further increasing the sealing performance of the rear end face of the annular oil plate 300 and the front end face of the stator core 200.

[0048] In addition, the rear end face of the annular oil plate 300 is provided with a plurality of positioning clamping claws 350, and the plurality of positioning clamping claws 350 are clamped on the outer wall of the stator core 200 in the circumferential direction. The plurality of positioning clamping claws 350 are integrally formed on the rear end face of the annular oil plate 300 in the circumferential direction, and the positioning clamping claw 350 includes a connecting portion extending outward in the radial direction and a bent portion extending rearward at the end portion of the extending portion. The rear end face of the connecting portion is attached to the front end face of the first punching sheet 210, and the bent portion is clamped in one of the axial through grooves on the outer wall of the first punching sheet 210. That is, the plurality of positioning clamping claws 350 can be axially positioned with the stator core 200 by means of the connecting portion, and the bent portion of the plurality of positioning clamping claws 350 can be circumferentially positioned with the stator core 200, thereby realizing the stability of the connection between the annular oil plate 300 and the stator core 200.

[0049] Preferably, the first oil injection hole 340 is inclined from outside to inside towards the front side. Wherein, from outside to inside is the direction from the motor shell 100 to the motor axis, which can make the cooling oil flowing out through the first oil injection hole 340 in the direction of inclination from outside to inside towards the front side, and flow and diffuse towards the root of the winding front end 120 and the front side, better cooling the winding front end 120.

[0050] Please refer to Figure 2 、 Figure 5 、 Figure 7 and Figure 8 , the rear end surface of the oil injection ring 400 is circumferentially provided with a plurality of mounting recesses 430, and the second axial connecting piece 431 is arranged on the mounting recess 430, and the plurality of second axial connecting pieces 431 are used to fix the oil injection ring 400 to the rear end of the stator core 200. The plurality of mounting recesses 430 are uniformly distributed on the rear end surface of the oil injection ring 400, which provides accurate mounting positions for the second axial connecting piece 431. This circumferential distribution design makes the oil injection ring 400 when installed on the rear end of the stator core 200, the force of each connecting point is uniform, which can effectively avoid the installation deviation or looseness problem caused by uneven force, and ensure that the oil injection ring 400 is closely attached to the stator core 200, and remains stable during the operation of the motor, and guarantees the accuracy and stability of the cooling oil injection, and further improves the cooling effect. The second axial connecting piece 431 adopts a connecting bolt, and the mounting recess 430 is matched with the connecting bolt, which simplifies the assembly process of the oil injection ring 400. During assembly, the worker can quickly install the connecting bolt into the through hole of the mounting recess 430, and then connect and fix it with the reserved threaded hole of the stator core 200, which can quickly disassemble and replace the oil injection ring 400. In addition, the close connection between the oil injection ring 400 and the stator core 200 helps to better transfer heat during motor operation, further improves the heat dissipation efficiency, and ensures the reliable operation of the motor.

[0051] The plurality of mounting recesses 430 divide the oil injection ring 400 into a plurality of second cooling chambers 410, and the plurality of second cooling chambers 410 and the plurality of axial through holes are one-to-one corresponding. The second cooling chamber 410 can be a semi-closed structure, and the side close to the oil injection ring 400 is provided with an open end, which is attached to the rear end face of the oil injection ring 400, thereby forming a closed structure of the second cooling chamber 410, and the axial through hole and the second cooling chamber are one-to-one corresponding through holes. Because the cross-sectional area of the open end is much larger than that of the axial through hole, the second cooling chamber 410 with the above-mentioned semi-closed structure is convenient to align the axial through hole and easy to operate. In order to ensure the sealing of the open end in the circumferential direction, a sealing ring needs to be arranged in the circumferential direction of the open end. The second cooling chamber 410 can also be a fully closed structure, and the side close to the oil injection ring 400 is provided with a bottom plate, and the bottom plate is attached to the rear end face of the oil injection ring 400, and the oil inlet 450 is adapted to the position of the axial through hole to realize the communication with each other, and a sealing ring also needs to be arranged in the circumferential direction of the oil inlet 450 to avoid oil leakage.

[0052] In addition, the second cooling chamber 410 can be an integrally formed box structure, or the side away from the oil injection ring 400 can be made into a movable cover plate, which not only facilitates the machining of the second oil injection hole 420 on the second cooling chamber 410, but also facilitates the machining of the oil guide tooth 440 on the cover plate.

[0053] Please refer to Figure 5 The inner wall of the oil injection ring 400 is provided with a plurality of oil guide teeth 440, which are arranged one-to-one on the rear side of the plurality of second oil injection holes 420, and the front side of the oil guide tooth 440 is provided with a guide inclined surface 441 inclined from outside to inside and towards the rear side. When the cooling oil contacts the guide inclined surface 441, it will change the flow direction under the guidance of the guide inclined surface 441 and be inclined to spray towards the winding rear end 130. It can ensure that the cooling oil is sprayed to the middle position of the winding rear end 130, and the cooling effect is the best, avoiding the dispersion of the cooling oil spray, ensuring that the cooling oil can uniformly cover the outer circle of the winding rear end 130, avoiding the situation of local insufficient cooling or excessive cooling, making the temperature of the winding rear end 130 more balanced, ensuring that the cooling oil can act on the key position, improving the cooling efficiency and effectively reducing the temperature of the winding rear end 130.

[0054] Preferably, the number of second oil injection holes 420 located at the upper part of the oil injection ring 400 is greater than the number of second oil injection holes 420 located at the lower part of the oil injection ring 400. Under the action of gravity, the cooling oil is more likely to flow out from the second oil injection holes 420 located at the lower part of the oil injection ring 400, and through the above-mentioned arrangement mode of the second oil injection hole 420, the cooling oil flowing out from the upper part of the oil injection ring 400 and the lower part of the oil injection ring 400 can achieve the effect of equal amount, ensuring the uniformity of the cooling of the winding rear end 130.

[0055] Based on the same inventive concept, the utility model still provides a kind of motor, including the stator cooling structure of above-mentioned. Since the motor has used the stator cooling structure of above-mentioned, therefore possess the same beneficial effect with stator cooling structure, here no longer repeat.

[0056] The above only is the preferred embodiment of the utility model, and does not use to limit the utility model, any modification, equivalent replacement and improvement etc. made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A stator cooling structure, characterized in that, include: An electric motor housing (100) is provided with an oil inlet pipe (110); A stator core (200) is disposed inside the motor housing (100), and a cooling channel is formed between the stator core (200) and the motor housing (100); An annular oil plate (300) is disposed at the front end of the stator core (200) and surrounds the outer periphery of the front end of the winding (120). A first cooling chamber (310) is formed between the annular oil plate (300) and the motor housing (100) to connect the oil inlet pipe (110) and the cooling channel. A plurality of first oil injection holes (340) are provided in the circumferential direction of the annular oil plate (300) to connect the first cooling chamber (310). An oil injection ring (400) is disposed at the rear end of the stator core (200) and surrounds the outer periphery of the rear end of the winding (130). A second cooling chamber (410) communicating with the cooling channel is provided inside the oil injection ring (400). A plurality of second oil injection holes (420) communicating with the second cooling chamber (410) are opened circumferentially on the oil injection ring (400).

2. The stator cooling structure as described in claim 1, characterized in that, The stator core (200) includes: The first lamination (210) has multiple axial through grooves on its outer periphery. The multiple axial through grooves and the motor housing (100) form a first cooling oil passage (211). The first cooling oil passage (211) is connected to the first cooling chamber (310). The annular oil plate (300) is located at the front end of the first lamination (210). The second lamination (220) is disposed at the rear end of the first lamination (210), and the second lamination (220) forms a second cooling oil passage (221) between the circumferential direction of the second lamination (220) and the motor housing (100); The third lamination (230) is disposed at the rear end of the second lamination (220). The third lamination (230) has multiple axial through holes in its circumferential direction, which form a third cooling channel (231). The third cooling channel (231) is connected to the second cooling chamber (410). The first cooling oil passage (211), the second cooling oil passage (221), and the third cooling passage (231) are connected in sequence to form the cooling oil passage.

3. The stator cooling structure as described in claim 2, characterized in that, The outer periphery of the third lamination (230) is provided with a plurality of connecting lugs (240), and the connecting lugs (240) are provided with a plurality of first axial connectors (241). The plurality of first axial connectors (241) are used to fix the third lamination (230) to the motor housing (100).

4. The stator cooling structure as described in claim 1, characterized in that, The front end of the outer wall of the annular oil plate (300) is sealed and fitted with the inner wall of the motor housing (100), the rear end of the outer wall of the annular oil plate (300) and the inner wall of the motor housing (100) form the first cooling chamber (310), and the rear end face of the annular oil plate (300) is sealed and fitted with the front end face of the stator core (200).

5. A stator cooling structure as described in claim 4, characterized in that, The rear end face of the annular oil plate (300) is provided with multiple positioning claws (350), which are engaged with the outer circumferential wall of the stator core (200).

6. The stator cooling structure as described in claim 1, characterized in that, The first oil injection hole (340) is inclined from the outside to the front.

7. A stator cooling structure as described in claim 1, characterized in that, The oil injection ring (400) has a plurality of mounting recesses (430) circumferentially arranged on its rear end face. The mounting recesses (430) are provided with second axial connectors (431). The plurality of second axial connectors (431) are used to fix the oil injection ring (400) to the rear end of the stator core (200).

8. A stator cooling structure as described in claim 1, characterized in that, The inner wall of the oil injection ring (400) is provided with a plurality of oil guide teeth (440) in a circumferential manner. The plurality of oil guide teeth (440) are respectively provided on the rear side of the plurality of second oil injection holes (420). The front side of the oil guide teeth (440) is provided with a guide slope (441) that is inclined from the outside to the inside and rear side.

9. A stator cooling structure as described in claim 1, characterized in that, The number of second injection holes (420) located on the upper part of the injection ring (400) is greater than the number of second injection holes (420) located on the lower part of the injection ring (400).

10. An electric motor, characterized in that, Includes the stator cooling structure as described in any one of claims 1-9.

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