Stator cooling structure, drive motor and power assembly

Abstract

The application relates to a stator cooling structure, a driving motor and a power assembly, and relates to the technical field of motors.The stator cooling structure comprises a base provided with a cooling flow channel, a pair of first iron cores and a connecting portion; the pair of first iron cores are symmetrically fixed on the two sides of the base; the first iron core comprises a plurality of first punching sheets which are sequentially stacked and are arranged in a staggered mode along the circumferential direction of the first iron core; the first punching sheet is provided with a plurality of oil guide portions along the circumferential direction; the oil guide portion comprises a plurality of oil guide channels which are sequentially and spaced apart along the circumferential direction of the first punching sheet and are arranged in a staggered mode along the radial direction of the first punching sheet; a plurality of centripetal oil paths are sequentially formed through a plurality of oil guide channels which are sequentially arranged along the axial direction of the first iron core and gradually reduce the distance from the center of the first punching sheet; the connecting portion is arranged between the base and the first iron core, and the end face blocks the peripheral area of the oil inlet end of the adjacent centripetal oil path. The application has the effects of good sealing performance and fast response speed of cooling oil.

Description

Technical Field

[0001] This application relates to the field of motor technology, and in particular to a stator cooling structure, a drive motor, and a powertrain. Background Technology

[0002] With the continuous development of new energy vehicles and the increasing market demand for their driving capabilities, the motors of new energy vehicles need to continuously improve their speed, torque density, and power density while gradually reducing their size. The higher the motor's speed, torque density, and power density, the more heat it generates. Therefore, proper heat dissipation and cooling structures are essential for the reliable, stable, and efficient operation of the motor.

[0003] In existing technologies, oil spraying rings are typically used to spray the two ends of the stator core. However, this method has the problems of large space occupation and poor heat dissipation.

[0004] Based on this, CN119742972A discloses a heat dissipation structure for an oil-cooled motor stator core surface oil cooling circuit. It forms a centripetal oil path with a gradually increasing number of channels on the end face of the stator core and facing the center of the stator. Several oil baffles are set in the middle part of the stator core to form a dispersed cooling oil circuit, so that the cooling oil and the core can be in more comprehensive contact to enhance the heat dissipation effect.

[0005] However, the oil baffle block makes the outer diameter of the middle stamping smaller than that of the end stamping. The cooling oil needs to completely fill the gap between the outer periphery of the middle stamping and the housing in order to enter the radial oil passage well. The radial oil passage is formed by 1 / 2 / 3 square holes connected in the axial direction. With the flow rate remaining constant, the reduced flow area further slows down the flow speed of the cooling oil, resulting in a slow cooling oil response.

[0006] Meanwhile, since the end face laminations need to be fixed to both ends of the middle laminations, and the outer diameter of the middle laminations is smaller than that of the end face laminations, the end face laminations can only be fixed by welding with the oil baffle block. The weld extends directly from the middle lamination to the outer edge of the end face laminations, and the cooling oil has a very high probability of seeping out from the stator cooling structure along the weld.

[0007] Furthermore, although theoretically the first, second, and third injection holes between adjacent radial oil circuits can be blocked due to misalignment in the case of incorrect sequence, this blocking method is not stable. Based on the design of the decentralized cooling oil circuit, cooling oil will further seep out from here when the cooling oil pressure is high enough.

[0008] In view of this, there is an urgent need to provide a stator cooling structure with fast cooling oil response and good sealing performance to enhance the heat dissipation effect of the stator cooling structure. Utility Model Content

[0009] The stator cooling structure provided in this application can significantly improve the response speed of the cooling oil and the sealing performance of the stator cooling structure, thereby enhancing the heat dissipation effect of the stator cooling structure.

[0010] Firstly, the stator cooling structure provided in this application adopts the following technical solution:

[0011] A stator cooling structure, comprising:

[0012] The base has cooling channels;

[0013] A pair of first iron cores are symmetrically fixed on both sides of the base. Each first iron core includes a plurality of first laminations that are stacked sequentially and staggered along their circumferential direction. Each first lamination has a plurality of oil guiding portions along the circumferential direction. Each oil guiding portion includes a plurality of oil guiding channels that are opened sequentially at intervals along the circumferential direction of the first lamination and staggered along the radial direction of the first lamination.

[0014] Multiple sets of radial oil passages are arranged on the periphery of the first iron core and are all connected to the cooling channel. The radial oil passages are formed by connecting several oil guide channels arranged one by one along the axial direction of the first iron core, with the distance between them and the center of the first lamination gradually decreasing.

[0015] A connecting part is disposed between the base and the first iron core. Multiple sets of continuous oil passages are opened on the outer periphery of the connecting part along its own axial direction. The oil inlet ends of the multiple sets of continuous oil passages are all connected to the cooling flow channel. The oil outlet ends of the multiple sets of continuous oil passages are connected to the multiple sets of centripetal oil passages one by one. The end face of the connecting part blocks the surrounding area of ​​the oil inlet end of the adjacent centripetal oil passage.

[0016] Furthermore, welding grooves are provided between adjacent oil guiding channels. When multiple first laminations are stacked in sequence, the welding grooves are connected along the axial direction of the first iron core to form several sets of first welding passages.

[0017] Furthermore, multiple sets of second welding passages are evenly distributed around the outer periphery of the connecting part along its own axial direction, and the multiple sets of second welding passages are connected to the multiple sets of first welding passages in a one-to-one correspondence.

[0018] Furthermore, the connecting portion includes two second iron cores stacked sequentially, and the second iron cores have the following openings:

[0019] Multiple sets of first passages are evenly distributed around the periphery of the second iron core;

[0020] Multiple sets of second passages are evenly distributed around the periphery of the second iron core, and the number is twice that of the first passage;

[0021] The two second iron cores are staggered in the circumferential direction so that any second passage is connected to the first passage to form the continuous oil passage. Another second passage on the second iron core is blocked by the adjacent second iron core to form a second welding passage.

[0022] Furthermore, the second iron core includes a plurality of second laminations stacked sequentially.

[0023] Furthermore, a keyway is provided on the side wall of the second welding passage.

[0024] Furthermore, the base includes a housing, which is securely sleeved on the outside of the first iron core and the second iron core;

[0025] The cooling channels are provided on the housing; or

[0026] The base also includes a third iron core, which, together with the inner circumferential surface of the housing and the end face of the connecting portion, forms the cooling channel.

[0027] Furthermore, the oil guiding channel of the oil guiding part that is farthest from the center of the first stamping is configured as a hole or a groove.

[0028] Secondly, this application provides a drive motor including the stator cooling structure described above.

[0029] Thirdly, this application provides a powertrain including the aforementioned drive motor.

[0030] In summary, this application includes at least one of the following beneficial technical effects:

[0031] 1. The application utilizes a staggered lamination design in the first lamination to form a radially continuous centripetal oil circuit, which, combined with the continuous oil circuit in the connecting part, guides the cooling oil from the cooling channel into the center of the iron core rapidly. This design reduces the flow resistance and collision of the cooling oil, thereby significantly accelerating the cooling oil response speed. The cooling oil can flow directly and efficiently from the inlet end to the outlet end, reducing the flow resistance of the cooling oil, making it suitable for high-speed, high-power-density drive motor applications.

[0032] 2. This application utilizes the end face of the connecting part to seal the surrounding area of ​​the oil inlet end of the adjacent radial oil passage, effectively sealing the potential gaps between the misaligned laminations. Simultaneously, the first and second welding passages formed by the welding groove, combined with the misaligned arrangement of the second iron core in the connecting part, reduce the risk of cooling oil seepage along the weld. Through this sealing design, stable operation can be maintained even under high oil pressure environments, improving the sealing performance and reliability of the stator cooling structure.

[0033] 3. This application uses two types of laminations, which can form both radial and continuous oil passages through staggered stacking, eliminating the need for additional oil baffles or complex oil ring parts. Specifically, the first core is formed by staggered stacking of three sets of identical first laminations, and the connecting part is formed by stacking multiple second laminations. The assembly process is optimized through welding pathways (such as keyway design). This not only reduces the number of parts and processing steps but also lowers manufacturing costs. At the same time, the simplified structure makes the cooling channels more compact and occupies less space, making it suitable for volume-sensitive fields such as drive motors for new energy vehicles. Attached Figure Description

[0034] Figure 1 This is a three-dimensional structural diagram of the stator cooling structure in this application;

[0035] Figure 2 yes Figure 1 A magnified view of part A in the middle;

[0036] Figure 3 This is a schematic diagram of the planar structure of the first lamination in this application;

[0037] Figure 4 This is a partial exploded structural diagram of the first iron core in this application.

[0038] In the diagram, 1 is the base; 11 is the cooling channel; 12 is the third iron core; 2 is the first iron core; 21 is the first lamination; 211 is the oil guide part; 2111 is the oil guide channel; 212 is the welding groove; 22 is the first welding passage; 3 is the radial oil passage; 4 is the connecting part; 41 is the continuous oil passage; 42 is the second welding passage; 43 is the second iron core; 431 is the first passage; and 432 is the second passage. Detailed Implementation

[0039] The following will be combined with the appendix Figure 1-4 The technical solution of this application is clearly and completely described. The following embodiments are exemplary and are only used to explain this application, and should not be construed as limiting this application. In the following description, the same reference numerals are used to denote the same or equivalent elements, and repeated descriptions are omitted.

[0040] In the description of this application, it should be understood that the terms "upper", "lower", "inner", "outer", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used to facilitate the description of this application and to simplify the description, and are not intended to indicate or imply that the equipment or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0041] Furthermore, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0042] It should also be further understood that the term “and / or” as used in this application refers to any combination of one or more of the listed items, and all possible combinations thereof.

[0043] Example 1:

[0044] A stator cooling structure, reference Figure 1 and Figure 2 It includes a base 1 and a pair of first iron cores 2. The base 1 has a cooling channel 11. The first iron cores 2 are symmetrically fixed on both sides of the base 1. The outer periphery of the first iron cores 2 is provided with a plurality of radial oil passages 3 that are connected to the cooling channel 11. The cooling oil flows through the cooling channel 11 to the radial oil passages 3 to achieve the purpose of cooling the stator.

[0045] Among them, reference Figure 3 The first iron core 2 includes several first laminations 21 stacked sequentially and staggered along their own circumferential direction. The first laminations 21 are evenly distributed with multiple sets of oil guiding parts 211 along the circumferential direction. The number of oil guiding parts 211 is specifically set according to the actual situation, such as 12 sets, 18 sets, 24 sets or even more.

[0046] The oil guiding part 211 includes a number of oil guiding channels that are sequentially spaced along the circumferential direction of the first lamination 21 and staggered along the radial direction of the first lamination 21. The centripetal oil passage 3 is formed by connecting a number of oil guiding channels that are sequentially arranged in the axial direction of the first iron core 2 and whose distance from the center of the first lamination 21 gradually decreases.

[0047] It should be noted that this embodiment does not specifically limit the number of oil guiding channels in the first stamping 21 and the oil guiding part 211.

[0048] It should also be noted that in this embodiment, the number of first stampings 21 corresponds to the number of oil guiding channels in the oil guiding part. For example, the number of first stampings 21 is set to 2, 3, 4 or more.

[0049] For example, in this embodiment, the first core 2 includes three sequentially stacked first laminations 21 staggered along their circumferential direction, and the oil guiding section 211 has three corresponding oil guiding channels. For ease of explanation, the oil guiding channels are named first channel 2111, second channel 2112, and third channel 2113 in order of their distance from the center of the first laminations 21, with the third channel 2113 being the farthest from the center of the first lamination.

[0050] That is, the centripetal oil passage 3 is formed by the third channel 2113, the second channel 2112 and the first channel 2111 arranged one after another along the radial direction of the first iron core 2. Since the positions of the third channel 2113, the second channel 2112 and the first channel 2111 are arranged differently along the radial direction of the first iron core 2, the oil inlet end of the centripetal oil passage 3 is located at the outer edge of the first iron core 2, and the oil outlet end of the centripetal oil passage 3 faces the center of the first iron core 2.

[0051] The orientation of the radial oil passage 3 allows the cooling oil to flow from the outer edge of the first iron core 2 to the center, achieving a better cooling effect. At the same time, by using a staggered stacking method, the number of parts such as oil rings is reduced. When assembling the first iron core 2, only multiple first laminations 21 with the same structure are needed, making the stator cooling structure simpler and less expensive.

[0052] It should be noted that this embodiment does not specifically limit the dimensions of the first channel 2111, the second channel 2112, and the third channel 2113. The dimensions of the first channel 2111, the second channel 2112, and the third channel 2113 can be designed differently to achieve the best spraying effect.

[0053] It should also be noted that when multiple first laminations 21 are stacked, the first channel 2111, the second channel 2112, and the third channel 2113 of adjacent first laminations 21 are misaligned in the circumferential direction, so that the two channels between adjacent radial oil circuits 3 are closed due to the mismatch in the succession sequence.

[0054] Furthermore, the oil guiding channel of the oil guiding part 211 that is furthest from the center of the first stamping 21 is configured as a hole or a groove. The remaining oil guiding channels of the oil guiding part 211 are configured as holes.

[0055] In a specific embodiment, the oil guiding channel of the oil guiding part 211 that is farthest from the center of the first stamping 21 is set in a groove shape. Continuing to describe based on the above example, the third channel 2113 is set in a groove shape. The third channel 2113 is the main component forming the oil inlet end of the radial oil passage 3. Its through-type setting can better introduce cooling oil into the radial oil passage 3. At the same time, the through-type third channel 2113 is also more convenient to process on the first stamping 21.

[0056] It should be noted that during the assembly of the stator cooling structure, the opening of the third channel 2113 will be blocked by the base 1, and the cooling oil can stably enter the radial oil passage 3 from the cooling channel 11.

[0057] Correspondingly, the base 1 includes a housing, which is securely fitted onto the outside of the first iron core 2 and the second iron core 43.

[0058] In one specific embodiment, the housing is sleeve-shaped, and an annular cooling channel 11 is formed on the inner circumferential surface of the waist of the housing.

[0059] In another specific embodiment, the base 1 further includes a third iron core 12, which together with the inner circumferential surface of the housing and the end face of the connecting part 4 forms a cooling channel 11, that is, the outer diameter of the third iron core 12 is smaller than that of the first iron core 2.

[0060] It should be noted that the number of the third iron core 12 is not specifically set in this embodiment. It can be set to a single one or multiple (for example, two or three third iron cores 12 stacked together).

[0061] It should be noted that this embodiment does not specifically limit the number of cooling channels 11. It can be set to a single channel or multiple channels, such as two, three, four or even more.

[0062] For example, the cooling channel 11 is configured as one.

[0063] For example, three cooling channels 11 are provided, and the three cooling channels 11 are arranged sequentially at intervals along the axial direction of the base 1. The three cooling channels 11 are connected sequentially by providing several grooves between adjacent cooling channels 11 in the base 1. Correspondingly, the base 1 also includes a fourth iron core. Multiple third iron cores 12 and fourth iron cores are provided and arranged in a cross pattern.

[0064] Reference Figure 2 and Figure 3 A welding groove 212 is provided between adjacent oil guiding channels. When multiple first stampings 21 are stacked in sequence, the welding groove 212 is connected along the circumferential direction of the first iron core 2 to form several sets of first welding passages 22 extending along the radial direction of the first stampings 21.

[0065] The first welding passage 22 provides a welding position, allowing multiple first laminations 21 to be welded together.

[0066] For example, in this embodiment, the number of first welding passages 22 is half that of the radial oil passages, that is, a set of first welding passages 22 is provided for every two sets of radial oil passages 3. Specifically, a group of welding grooves 212 is formed, and the number of groups of welding grooves 212 is half that of the oil guide section.

[0067] Continuing with the above example, three welding grooves 212 are arranged as a group, and the three welding grooves 212 are arranged sequentially along the circumferential direction of the first punch 21. Specifically, they are located between the first channel 2111 and the second channel 2112, between the second channel 2112 and the third channel 2113, and between the third channel 2113 and the first channel 2111.

[0068] It should be noted that this embodiment does not specifically limit the number of the first welding channels 22. The number of the first welding channels 22 can be further increased or decreased, including but not limited to, the number of the first welding channels 22 being 1 / 3 of the number of the radial oil channels 3, and the number of the first welding channels 22 being consistent with the number of the radial oil channels 3.

[0069] It should also be noted that when the number of first laminations 21 increases, the number of welding grooves 212 in each group of welding grooves 212 increases accordingly.

[0070] Furthermore, combined Figure 1 A connecting part 4 is provided between the base 1 and the first iron core 2. Multiple sets of continuous oil passages 41 are evenly distributed on the outer periphery of the connecting part 4 along its own axial direction. The oil inlet end of the multiple sets of continuous oil passages 41 is connected to the cooling flow channel 11, and the oil outlet end of the multiple sets of continuous oil passages 41 is connected to the multiple sets of centripetal oil passages 3 one by one.

[0071] That is, the spacing between adjacent continuous oil passages 41 is consistent with the spacing between adjacent radial oil passages 3. The continuous oil passages 41 are arranged so that the cooling flow channel 11 and the radial oil passage 3 can be connected well, so as to better guide the flow direction of the cooling oil, so that the cooling oil flows along the axial direction of the cooling section and then flows towards the center of the first iron core 2, so as to reduce the collision caused by the cooling oil directly entering the radial oil passage 3 from the cooling flow.

[0072] Simultaneously, the end face of the connecting part 4 blocks the surrounding area of ​​the oil inlet end of the adjacent radial oil passage 3. Specifically, the end face portion of the connecting part 4 between adjacent continuous oil passages 41 can block the first channel 2111, the second channel 2112, and the third channel 2113 between adjacent radial oil passages 3. Since the first iron core 2 between adjacent radial oil passages 3 does not have a first welding passage 22, it can effectively reduce the possibility of some cooling oil seeping out due to excessive oil pressure.

[0073] It should be noted that the outer diameter of the connecting part 4 can be consistent with the outer diameter of the first iron core 2, or it can be increased or decreased as needed to ensure that the end face portion between adjacent continuous oil passages 41 of the connecting part 4 can be well sealed.

[0074] Furthermore, multiple sets of second welding passages 42 are evenly distributed along the axial direction of the outer periphery of the connecting part 4, and the multiple sets of second welding passages 42 are connected to the multiple sets of first welding passages 22 in a one-to-one correspondence. The second welding passages 42 are connected to the first welding passages 22, so that the first iron core 2 is fixed to the connecting part 4 by welding.

[0075] Meanwhile, considering that some cooling oil may pass through the first welding passage 22 from the second welding passage 42, leading to the risk of oil leakage. (Refer to...) Figure 1 The connecting part 4 includes two second iron cores 43 stacked in sequence. Multiple sets of first passages 431 and multiple sets of second passages 432 are opened on the second iron cores 43. The multiple sets of first passages 431 are evenly distributed on the periphery of the second iron cores 43, and the multiple sets of second passages 432 are evenly distributed on the periphery of the second iron cores 43, and the number is twice that of the first passages 431.

[0076] The two second iron cores 43 are staggered in the circumferential direction so that any second passage 432 is connected to the first passage 431 to form a continuous oil passage 41. When forming the connecting part 4, the two second iron cores 43 are welded together through the formed continuous oil passage 41. That is, in addition to conducting cooling oil, the continuous oil passage 41 can also serve as a welding groove to fix the two second iron cores 43, thereby reducing the need for welding grooves.

[0077] Another second passage 432 on the second iron core 43 is blocked by the adjacent second iron core 43, forming a second welding passage 42. That is, the second welding passage 42 on the second iron core 43, which is fixed with the first iron core 2, is blocked by the end face of the adjacent second iron core 43 to reduce the possibility of oil leakage caused by the overflow of cooling oil from the first welding passage 22.

[0078] Furthermore, the second core 43 includes a plurality of second laminations stacked sequentially. The second laminations are provided with a first through groove and a second through groove. The plurality of first through grooves are connected along the axial direction of the second laminations to form a first passage 431, and the plurality of second through grooves are connected along the axial direction of the second laminations to form a second passage 432.

[0079] The connecting part 4 is formed by stacking and welding the second stampings. On this basis, a keyway is provided on the side wall of the second welding passage 42. When the second stampings are stacked, a key is inserted into the keyway to pre-fix the multiple second stampings. Then, adjacent second stampings are welded in the second welding passage 42 to optimize the forming method.

[0080] It should be noted that after the connecting part 4 is formed, both the keyway and the second welding passage 42 are blocked by the end face of the second iron core 43. It should also be noted that, based on the same principle, a keyway can also be formed on the first iron core 2 to facilitate assembly.

[0081] By using two types of laminations, namely the first lamination 21 and the second lamination, the main part of the stator cooling structure can be formed, the assembly process is optimized, and the cost of forming the stator cooling structure is lower.

[0082] Example 2:

[0083] The difference between this embodiment 2 and embodiment 1 is that a drive motor is also disclosed, which includes the stator cooling structure described in embodiment 1.

[0084] Example 3:

[0085] The difference between this embodiment 2 and embodiment 2 is that a powertrain is also disclosed, which includes the drive motor described in embodiment 2.

[0086] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A stator cooling structure, characterized in that, include: The base (1) has a cooling channel (11); A pair of first iron cores (2) are symmetrically fixed on both sides of the base (1). The first iron core (2) includes a number of first laminations (21) stacked in sequence and staggered along their own circumferential direction. The first laminations (21) have multiple sets of oil guiding parts (211) along the circumferential direction. The oil guiding parts (211) include a number of oil guiding channels that are opened at intervals along the circumferential direction of the first laminations (21) and staggered along the radial direction of the first laminations (21). Multiple sets of radial oil passages (3) are arranged on the periphery of the first iron core (2) and are all connected to the cooling channel (11). The radial oil passages (3) are formed by connecting several oil guide channels arranged one by one along the axial direction of the first iron core (2) with the distance between them and the center of the first lamination (21) gradually decreasing. A connecting part (4) is provided between the base (1) and the first iron core (2). Multiple sets of continuous oil passages (41) are opened on the outer periphery of the connecting part (4) along its own axial direction. The oil inlet end of the multiple sets of continuous oil passages (41) is connected to the cooling channel (11). The oil outlet end of the multiple sets of continuous oil passages (41) is connected to the multiple sets of centripetal oil passages (3) one by one. The end face of the connecting part (4) blocks the surrounding area of ​​the oil inlet end of the adjacent centripetal oil passage (3).

2. The stator cooling structure according to claim 1, characterized in that, Welding grooves (212) are provided between adjacent oil guiding channels. When multiple first punches (21) are stacked in sequence, the welding grooves (212) are connected along the axial direction of the first iron core (2) to form several sets of first welding passages (22).

3. The stator cooling structure according to claim 2, characterized in that, Multiple sets of second welding passages (42) are evenly distributed on the outer periphery of the connecting part (4) along its own axial direction, and the multiple sets of second welding passages (42) are connected to the multiple sets of first welding passages (22) in a one-to-one correspondence.

4. A stator cooling structure according to claim 3, characterized in that, The connecting part (4) includes two second iron cores (43) stacked sequentially, and the second iron cores (43) have the following openings: Multiple sets of first passages (431) are evenly distributed around the second iron core (43); Multiple sets of second passages (432) are evenly distributed around the second iron core (43), and the number is twice that of the first passage (431); Two second iron cores (43) are staggered in the circumferential direction so that any second passage (432) is connected to the first passage (431) to form the continuous oil passage (41). Another second passage (432) on the second iron core (43) is blocked by the adjacent second iron core (43) to form a second welding passage (42).

5. A stator cooling structure according to claim 4, characterized in that, The second iron core (43) includes a plurality of second laminations stacked in sequence.

6. A stator cooling structure according to claim 3, characterized in that, A keyway is provided on the side wall of the second welding passage (42).

7. A stator cooling structure according to claim 4, characterized in that, The base (1) includes a housing, which is fastened to the outside of the first iron core (2) and the second iron core (43); The cooling channel (11) is provided on the housing; or The base (1) also includes a third iron core (12), which together with the inner circumferential surface of the housing and the end face of the connecting part (4) forms the cooling channel (11).

8. A stator cooling structure according to claim 1, characterized in that, The oil guiding channel (2111) of the oil guiding part (211) that is farthest from the center of the first stamping (21) is set in the shape of a hole or a groove.

9. A drive motor, characterized in that, Includes the stator cooling structure as described in any one of claims 1-8.

10. A powertrain, characterized in that, Includes the drive motor as described in claim 9.

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