Stator, electric motor, powertrain and vehicle

Abstract

Disclosed in the present application are a stator, an electric motor, a powertrain and a vehicle. The stator comprises a stator core, and a yoke portion and a tooth portion which are arranged in sequence in the axial direction of the stator core. The stator core is provided with a cooling channel that extends in a radial direction of the stator core, and the cooling channel comprises a plurality of flow channel sections that are in communication with each other, with some of the flow channel sections being arranged on the tooth portion, and some of the flow channel sections being arranged on the yoke portion. After a coolant is introduced into the cooling channel, the coolant can be in contact with the tooth portion and the yoke portion of the stator core for heat exchange, thereby sufficiently cooling the stator core, and thus improving the cooling effect of the stator.

Description

A stator, an electric motor, a powertrain, and a vehicle

[0001] Cross-references to related applications

[0002] This application claims priority to Chinese Patent Application No. 202411551880.1, filed with the Chinese Patent Office on October 31, 2024, entitled "A stator core, stator, motor, powertrain and vehicle", the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application belongs to the field of vehicle technology, specifically relating to a stator, motor, powertrain, and vehicle. Background Technology

[0004] Axial flux motors (hereinafter referred to as motors) are widely used in the electric vehicle field due to their advantages such as small size, high torque density, high power density, and high efficiency. During operation, motors generate various losses, leading to heat generation, with the stator being the primary heat-generating component.

[0005] In related technologies, cooling of the stator is achieved by introducing coolant into the motor and bringing the coolant into contact with the stator. However, the coolant often fails to make sufficient contact with the stator for heat exchange, resulting in poor stator cooling performance. Summary of the Invention

[0006] This application aims to provide a stator, motor, powertrain, and vehicle to solve the problem that the stator of existing motors is difficult to fully contact and exchange heat with the coolant, resulting in poor stator cooling effect.

[0007] To solve the above-mentioned technical problems, this application is implemented as follows:

[0008] In a first aspect, this application discloses a stator, including a stator core, comprising: a yoke and teeth sequentially arranged along the axial direction of the stator core, and

[0009] The cooling channel extends radially along the stator core and includes multiple interconnected flow channel sections, some of which are located in the tooth section and some in the yoke section.

[0010] In some embodiments, a plurality of teeth are provided, and the plurality of teeth are spaced apart along the circumference of the stator core, and a slot is formed between two adjacent teeth for mounting the stator winding.

[0011] The yoke includes a near-groove area close to the groove, and the flow channel section provided in the yoke is located in the near-groove area.

[0012] In some embodiments, the stator core includes a first core segment, a second core segment, and a third core segment arranged sequentially from the outside to the inside along the radial direction of the stator core. The first core segment includes a first tooth and a first yoke, the second core segment includes a second tooth and a second yoke, and the third core segment includes a third tooth and a third yoke.

[0013] The flow channel section includes a first flow channel section, a second flow channel section, and a third flow channel section arranged sequentially from the outside to the inside along the radial direction of the stator core. The first flow channel section is located in the first tooth section, the second flow channel section is located in the second tooth section and the second yoke section, and the third flow channel section is located in the third yoke section.

[0014] In some embodiments, the second flow channel segment includes: a first sub-flow channel segment and a second sub-flow channel segment that are interconnected;

[0015] The first sub-flow channel section is located on the second tooth section, and the end of the first sub-flow channel section opposite to the second sub-flow channel section is connected to the first flow channel section;

[0016] The second sub-flow channel section is located at the second yoke, and the end of the second sub-flow channel section that is away from the first sub-flow channel section is connected to the third flow channel section.

[0017] In some embodiments, a first flow channel section is formed within a first toothed portion, a first sub-flow channel section is formed within a second toothed portion, a second sub-flow channel section is formed within a second yoke portion, and a third flow channel section is formed within a third yoke portion.

[0018] In some embodiments, the groove in the third core section includes: a third groove, the third flow channel section having a first sidewall near the third groove, the first sidewall being provided with a communicating groove to allow the third flow channel section to communicate with the third groove.

[0019] In some embodiments, a plurality of first flow channels are provided, and the plurality of first flow channels are arranged at intervals along the circumferential direction of the stator core on the first tooth portion.

[0020] In some embodiments, multiple third flow channels are provided, and the multiple third flow channels are spaced apart along the circumferential direction of the stator core in the third yoke.

[0021] In some embodiments, a plurality of first sub-flow channels are provided, and the plurality of first sub-flow channels are spaced apart along the circumferential direction of the stator core on the second tooth portion, and one first sub-flow channel segment is connected to at least one first flow channel segment;

[0022] Multiple second sub-flow channels are provided, and the multiple second sub-flow channels are arranged at intervals along the circumference of the stator core in the second yoke. One second sub-flow channel is connected to at least one third flow channel.

[0023] In some embodiments, the groove in the first core section includes: a first groove, a first tooth having a first surface facing the first groove, and a first flow channel section formed on the first surface.

[0024] In some embodiments, the first flow channel section is a first groove recessed from the first surface away from the first slot along the circumferential direction of the stator core. Multiple first grooves are provided, and the multiple first grooves are spaced apart along the axial direction of the stator core.

[0025] In some embodiments, the groove in the third core section includes: a third groove, a third yoke having a fourth surface facing the third groove, and a third flow channel section formed on the fourth surface.

[0026] In some embodiments, the third flow channel section is a fourth groove that is recessed from the fourth surface away from the third slot along the radial direction of the stator core. Multiple fourth grooves are provided, and the multiple fourth grooves are spaced apart along the circumference of the stator core.

[0027] In some embodiments, the groove portion in the second core section includes: a second groove portion, a second tooth portion having a second surface facing the second groove portion, a first sub-flow channel portion formed on the second surface, a second yoke portion having a third surface facing the second groove portion, and a second sub-flow channel portion formed on the third surface.

[0028] In some embodiments, the first sub-channel section is a second groove recessed from the second surface away from the second slot along the circumferential direction of the stator core. Multiple second grooves are provided, and the multiple second grooves are spaced apart along the axial direction of the stator core. One second groove communicates with at least one first groove.

[0029] The second sub-flow channel section is a third groove that is recessed from the third surface away from the second slot along the radial direction of the stator core. Multiple third grooves are provided, and the multiple third grooves are spaced apart along the circumference of the stator core. One third groove is connected to at least one fourth groove.

[0030] In some embodiments, the first core segment has a first thickness in the radial direction of the stator core, the second core segment has a second thickness in the radial direction of the stator core, and the third core segment has a third thickness in the radial direction of the stator core.

[0031] The second thickness is less than the first thickness and / or the third thickness.

[0032] Secondly, this application also discloses an electric motor, including the stator described above.

[0033] In some embodiments, the motor further includes a housing, a stator disposed within the housing, and a stator core having two peripheral walls spaced radially apart along the stator core. One peripheral wall and the housing form a cooling chamber, and a cooling channel is used to connect the two cooling chambers.

[0034] In some embodiments, the motor further includes a seal disposed at one end of the stator core along the axial direction, the seal, the peripheral wall, and the housing forming a cooling chamber.

[0035] In some embodiments, the housing includes: an end plate, a first side plate and a second side plate. The end plate is disposed at one end of the stator core away from the seal. The first side plate and the second side plate are both connected to the end plate and are arranged at radial intervals along the stator core. The second side plate is close to the center of the end plate.

[0036] The peripheral wall includes a first peripheral wall and a second peripheral wall, and the cooling chamber includes a first cooling chamber and a second cooling chamber. The first cooling chamber is surrounded by an end plate, a first side plate, a seal and a first peripheral wall, and the second cooling chamber is surrounded by an end plate, a second side plate, a seal and a second peripheral wall.

[0037] In some embodiments, the housing further includes an inlet channel and an outlet channel, the inlet channel being connected to one of the first cooling chamber or the second cooling chamber, and the outlet channel being connected to the other of the first cooling chamber or the second cooling chamber.

[0038] In some embodiments, the liquid inlet channel is disposed on the end plate and / or the first side plate;

[0039] Alternatively, the liquid outlet channel may be located on the end plate and / or the first side plate.

[0040] In some embodiments, the inlet channel is an inlet hole, and / or the outlet channel is an outlet hole.

[0041] In some embodiments, the motor further includes a first sealing ring disposed between the seal and the housing to provide a sealed connection between the seal and the housing.

[0042] Thirdly, this application also discloses a powertrain including the aforementioned electric motor.

[0043] Fourthly, this application also discloses a vehicle including the aforementioned motor or powertrain.

[0044] In this embodiment, the stator core is provided with cooling channels extending radially along the stator core, with some flow channels located in the tooth section and others in the yoke section. Therefore, when coolant is introduced into the cooling channels, the coolant can contact and exchange heat with both the tooth section and the yoke section of the stator core, increasing the contact area between the coolant and the stator core. This achieves sufficient cooling of the stator core and further improves the stator's cooling effect.

[0045] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0046] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0047] Figure 1 is a schematic diagram of the structure of an electric motor provided in some embodiments of this application;

[0048] Figure 2 is a second schematic diagram of the structure of an electric motor provided in some embodiments of this application;

[0049] Figure 3 is a third schematic diagram of the structure of an electric motor provided in some embodiments of this application;

[0050] Figure 4 is a schematic diagram of the structure of a motor housing provided in some embodiments of this application;

[0051] Figure 5 is a schematic diagram of the structure of a motor stator provided in some embodiments of this application;

[0052] Figure 6 is a schematic diagram of the stator winding structure provided in some embodiments of this application;

[0053] Figure 7 is a schematic diagram of the stator core provided in Embodiment 1 of this application;

[0054] Figure 8 is a partial structural schematic diagram of the stator core provided in Embodiment 1 of this application;

[0055] Figure 9 is a composite schematic diagram of the stator core provided in Embodiment 1 of this application;

[0056] Figure 10 is a schematic diagram of the fluid domain of the flow channel of the stator core provided in Embodiment 1 of this application;

[0057] Figure 11 is a schematic diagram of a local fluid domain of the flow channel of the stator core provided in Embodiment 1 of this application;

[0058] Figure 12 is a schematic diagram of the stator core provided in Embodiment 2 of this application;

[0059] Figure 13 is a partial structural schematic diagram of the stator core provided in Embodiment 2 of this application;

[0060] Figure 14 is a composite schematic diagram of the stator core provided in Embodiment 2 of this application;

[0061] Figure 15 is a schematic diagram of the fluid domain of the stator core provided in Embodiment 2 of this application;

[0062] Figure 16 is a schematic diagram of a local fluid domain of the flow channel of the stator core provided in Embodiment 2 of this application;

[0063] Figure 17 is a schematic diagram of the stator core provided in Embodiment 3 of this application;

[0064] Figure 18 is a partial structural schematic diagram of the stator core provided in Embodiment 3 of this application;

[0065] Figure 19 is a composite schematic diagram of the stator core provided in Embodiment 3 of this application;

[0066] Figure 20 is a schematic diagram of the fluid domain of the stator core provided in Embodiment 3 of this application;

[0067] Figure 21 is a schematic diagram of a local fluid domain of the flow channel of the stator core provided in Embodiment 3 of this application;

[0068] Figure 22 is a schematic diagram of the stator core provided in Embodiment 4 of this application;

[0069] Figure 23 is one of the partial structural schematic diagrams of the stator core provided in Embodiment 4 of this application;

[0070] Figure 24 is a second partial structural schematic diagram of the stator core provided in Embodiment 4 of this application;

[0071] Figure 25 is a third partial structural schematic diagram of the stator core provided in Embodiment 4 of this application;

[0072] Figure 26 is a composite schematic diagram of the stator core provided in Embodiment 4 of this application;

[0073] Figure 27 is a schematic diagram of the fluid domain of the stator core provided in Embodiment 4 of this application;

[0074] Figure 28 is a schematic diagram of a local fluid domain of the flow channel of the stator core provided in Embodiment 4 of this application.

[0075] Reference numerals: 1. Shell, 11. End plate, 12. First side plate, 13. Second side plate, 14. Liquid inlet channel, 15. Liquid outlet channel, 16. Mounting cavity, 2. Stator, 21. Stator core, 211. First core section, 2111. First tooth, 2112. First yoke, 2113. First groove, 2114. First flow channel section, 212. Second core section, 2121. Second tooth, 2122. Second yoke, 2123. Second groove, 2124. Second flow channel section, 21241. 1. Sub-flow channel section, 21242. Second sub-flow channel section, 213. Third core section, 2131. Third tooth section, 2132. Third yoke section, 2133. Third slot section, 2134. Third flow channel section, 2135. Connecting slot, 214. First peripheral wall, 215. Second peripheral wall, 22. Stator winding, 3. Seal, 4. Cooling chamber, 41. First cooling chamber, 42. Second cooling chamber, 5. Rotor, 6. Shaft, 7. Bearing, A. First fluid domain, B. Second fluid domain, C. Third fluid domain. Detailed Implementation

[0076] Some embodiments of this application will now be described in detail. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0077] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise stated, "multiple" means two or more. Furthermore, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0078] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0079] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, 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 communication 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.

[0080] Some embodiments of this application provide a stator, including a stator core 21. The stator core 21 of this application will be described in detail below with reference to the accompanying drawings.

[0081] Referring to Figures 1 to 3, a structural schematic diagram of an electric motor provided in some embodiments of this application is shown. Referring to Figure 4, a structural schematic diagram of the housing of an electric motor provided in some embodiments of this application is shown. Referring to Figure 5, a structural schematic diagram of the stator of an electric motor provided in some embodiments of this application is shown. Referring to Figure 6, a structural schematic diagram of the stator winding provided in some embodiments of this application is shown. Referring to Figures 7 and 8, a structural schematic diagram of the stator core provided in Embodiment 1 of this application is shown. Referring to Figure 9, a composite schematic diagram of the stator core provided in Embodiment 1 of this application is shown. Referring to Figures 10 and 11, a fluid domain schematic diagram of the flow channel of the stator core provided in Embodiment 1 of this application is shown. Referring to Figures 12 and 13, a structural schematic diagram of the stator core provided in Embodiment 2 of this application is shown. Referring to Figure 14... Figures 7, 12, 17, and 22 of this application show a composite schematic diagram of the stator core provided in Embodiment 2; Figures 15 and 16 show a schematic diagram of the fluid domain of the stator core provided in Embodiment 2; Figures 17 and 18 show a schematic diagram of the stator core provided in Embodiment 3; Figure 19 shows a composite schematic diagram of the stator core provided in Embodiment 3; Figures 20 and 21 show a schematic diagram of the fluid domain of the stator core provided in Embodiment 3; Figures 22 to 25 show a schematic diagram of the stator core provided in Embodiment 4; Figure 26 shows a composite schematic diagram of the stator core provided in Embodiment 4; and Figures 27 and 28 show a schematic diagram of the fluid domain of the stator core provided in Embodiment 4. For ease of understanding, Figures 7, 12, 17, and 22 of this application use dashed lines to schematically divide different core segments. Figures 8, 13, 18, and 25 use solid lines to schematically represent the flow channels of the stator core.

[0082] As shown in Figures 7 to 28, this application provides a stator core 21, including: a yoke and teeth sequentially arranged in the axial direction of the stator core 21, and a cooling channel extending in the radial direction of the stator core 21. The cooling channel includes multiple interconnected flow channel sections, some of which are located in the teeth and some in the yoke. Specifically, the yoke extends circumferentially along the stator core 21, and the teeth are located on one side of the yoke along the axial direction of the stator core 21.

[0083] In some embodiments of this application, since the stator core 21 is provided with a cooling channel extending radially along the stator core 21, and part of the flow channel is located in the tooth section and part of the flow channel is located in the yoke section, after the coolant is introduced into the cooling channel, the coolant can contact and exchange heat with the tooth section and the yoke section of the stator core 21 respectively. This increases the contact heat exchange area between the coolant and the stator core 21, achieving sufficient cooling of the stator core 21 and further improving the cooling effect of the stator 2.

[0084] For a single cooling channel, since some flow channel sections are located in the tooth section and some in the yoke section, the placement of the flow channel sections is relatively flexible. Those skilled in the art can adjust the placement according to actual needs to adapt to different application scenarios. It should be noted that some embodiments of this application have multiple cooling channels arranged sequentially along the circumference of the stator core 21. This allows the stator core 21 to receive sufficient and uniform cooling throughout the entire circumference, which is beneficial for improving the cooling effect and uniformity of the stator core 21. It is understood that adjacent cooling channels may or may not be connected; this is not limited here, and those skilled in the art can adjust the placement according to actual needs.

[0085] It should be noted that in some embodiments of this application, multiple core segments can be integrally formed or separately formed, and this is not limited. Those skilled in the art can adjust them according to actual needs. It is understood that when multiple core segments are integrally formed, the overall structural strength of the stator core 21 can be improved. In one embodiment, the stator core 21 is integrally formed by a winding process. Specifically, slots (including slots for forming grooves and flow channels) are punched into the strip as needed, and the strip is wound using a winding mechanism. When the number of turns reaches the thickness requirement of the stator core 21, it is cut to obtain the required stator core 21. The stator core 21 has multiple interconnected flow channels in the radial direction. Furthermore, the number of core segments is not limited in the embodiments of this application, and those skilled in the art can adjust it according to actual needs.

[0086] In some embodiments of this application, a plurality of teeth are provided, and the plurality of teeth are spaced apart along the circumference of the stator core 21. A slot is formed between two adjacent teeth, and the slot is used to install the stator winding 22. The yoke includes a near-slot area close to the slot, and the flow channel section provided in the yoke is located in the near-slot area.

[0087] In practical applications, the main heat-generating component in the stator 2 is the stator winding 22, which is at least partially embedded in the slots of the stator core 21. Therefore, for the flow channel section located in the yoke, by opening the flow channel section in the near-slot region of the yoke, the flow channel section can be made as close as possible to the stator winding 22, thereby further improving the cooling effect of the stator 2, effectively increasing the motor's operating efficiency, torque density, and power density, and enhancing the motor's continuous operating capability. It should be noted that in this embodiment, the yoke is divided into a near-slot region and a far-slot region along the axial direction of the stator core 21. The near-slot region refers to the area close to the slots, and the far-slot region refers to the area far from the slots.

[0088] In some embodiments of this application, the stator core 21 includes a first core segment 211, a second core segment 212, and a third core segment 213 arranged sequentially from the outside to the inside along the radial direction of the stator core 21. The first core segment 211 includes a first tooth portion 2111 and a first yoke portion 2112. The second core segment 212 includes a second tooth portion 2121 and a second yoke portion 2122. The third core segment 213 includes a third tooth portion 2131 and a third yoke portion 2132. The flow channel segment includes a first flow channel segment 2114, a second flow channel segment 2124, and a third flow channel segment 2134 arranged sequentially from the outside to the inside along the radial direction of the stator core 21. The first flow channel segment 2114 is disposed on the first tooth portion 2111. The second flow channel segment 2124 is disposed on the second tooth portion 2121 and the second yoke portion 2122. The third flow channel segment 2134 is disposed on the third yoke portion 2132.

[0089] In practical applications, taking an axial permanent magnet motor as an example, its stator core 21 typically adopts a parallel slot structure, meaning the slot width along the radial direction of the stator core 21 is consistent. This causes the width of the teeth along the radial direction of the stator core 21 to increase sequentially from the inside to the outside. Simultaneously, the thickness of the yoke (i.e., the thickness of the yoke along the axial direction of the stator core 21) remains constant along the radial direction of the stator core 21. This results in the following: the magnetic saturation degree of the teeth located inside the stator core 21 is higher than that of the teeth located outside the stator core 21, and the magnetic saturation degree of the yoke located inside the stator core 21 is lower than that of the yoke located outside the stator core 21, leading to lower utilization rates for the outer teeth and inner yoke. Therefore, on the one hand, by opening the first flow channel section 2114 in the first tooth section 2111 and the third flow channel section 2134 in the third yoke section 2132, the utilization rate of the inner teeth and outer yoke can be improved. On the other hand, by opening the second flow channel section 2124 in the second toothed portion 2121 and the second yoke portion 2122, the portion of the second flow channel section 2124 located in the second toothed portion 2121 can communicate with the first flow channel section 2114 located in the first toothed portion 2111, and the portion of the second flow channel section 2124 located in the second yoke portion 2122 can communicate with the third flow channel section 2134 located in the third yoke portion 2132. In other words, the first flow channel section 2114 and the second flow channel section 2124 can be connected to form a complete flow channel for the circulation of coolant.

[0090] It should be noted that in some embodiments of this application, the multiple core segments (i.e., the first core segment 211, the second core segment 212, and the third core segment 213) can be integrally formed or separately formed, which is not limited here. Those skilled in the art can adjust them according to actual needs. It is understood that when multiple core segments are integrally formed, the overall structural strength of the stator core 21 can be improved. In some embodiments, the stator core 21 is integrally formed by a winding process. Specifically, as needed, slots (including slots for forming grooves and flow channels) are punched into the strip, and the strip is wound using a winding mechanism. When the number of turns reaches the thickness requirement of the stator core 21, it is cut to obtain the required stator core 21. The stator core 21 has multiple flow channels that are interconnected in the radial direction. In addition, the embodiments of this application only show the case where the stator core 21 includes three core segments. In practical applications, those skilled in the art can also refer to the above-mentioned technical solution of three core segments and adjust the number of core segments according to actual needs, which is not limited here.

[0091] Furthermore, in some embodiments of this application, "inner side" refers to the side closer to the center of the stator core 21, and "outer side" refers to the side away from the center of the stator core 21. It is understood that the first yoke 2112, the second yoke 2122, and the third yoke 2132 are arranged sequentially along the radial direction of the stator core 21, and the three together form the yoke of the stator core 21. The first tooth 2111, the second tooth 2121, and the third tooth 2131 are arranged sequentially along the radial direction of the stator core 21, and the three together form the tooth of the stator core 21.

[0092] Furthermore, the second flow channel section 2124 includes: a first sub-flow channel section 21241 and a second sub-flow channel section 21242 that are interconnected; the first sub-flow channel section 21241 is disposed on the second tooth portion 2121, and the end of the first sub-flow channel section 21241 facing away from the second sub-flow channel section 21242 is connected to the first flow channel section 2114; the second sub-flow channel section 21242 is disposed on the second yoke portion 2122, and the end of the second sub-flow channel section 21242 facing away from the first sub-flow channel section 21241 is connected to the third flow channel section 2134. In this way, through the connection between the first sub-flow channel section 21241 and the first flow channel section 2114, and the connection between the second sub-flow channel section 21242 and the third flow channel section 2134, the sequential connection of the first flow channel section 2114, the second flow channel section 2124, and the third flow channel section 2134 can be achieved.

[0093] In some embodiments of this application, the first flow channel section 2114 is formed within the first tooth portion 2111, the first sub-flow channel section 21241 is formed within the second tooth portion 2121, the second sub-flow channel section 21242 is formed within the second yoke portion 2122, and the third flow channel section 2134 is formed within the third yoke portion 2132. That is, the cooling channel formed by the combination of the first flow channel section 2114, the first sub-flow channel section 21241, the second sub-flow channel section 21242, and the third flow channel section 2134 is formed inside the stator core 21. This allows the coolant to fully contact the interior of the stator core 21, which is beneficial for improving the cooling effect of the stator 2.

[0094] In some embodiments of this application, the groove in the third core section 213 includes: a third groove 2133, and a third flow channel section 2134 having a first sidewall near the third groove 2133, the first sidewall being provided with a communicating groove 2135 to allow the third flow channel section 2134 to communicate with the third groove 2133. In this way, the coolant entering the third flow channel section 2134 can not only directly contact and exchange heat with the interior of the stator core 21, but also directly contact and exchange heat with at least a portion of the stator winding 22 located in the third groove 2133, thereby further improving the cooling effect of the stator 2.

[0095] In some embodiments of this application, multiple first flow channel sections 2114 are provided, and multiple first flow channel sections 2114 are spaced apart along the circumferential direction of the stator core 21 on the first tooth portion 2111.

[0096] Furthermore, multiple third flow channel sections 2134 are provided, and multiple third flow channel sections 2134 are arranged at intervals along the circumference of the stator core 21 on the third yoke 2132.

[0097] Furthermore, multiple first sub-flow channel sections 21241 are provided, and the multiple first sub-flow channel sections 21241 are arranged at intervals along the circumference of the stator core 21 on the second tooth portion 2121. One first sub-flow channel section 21241 is connected to at least one first flow channel section 2114. Multiple second sub-flow channel sections 21242 are provided, and the multiple second sub-flow channel sections 21242 are arranged at intervals along the circumference of the stator core 21 on the second yoke portion 2122. One second sub-flow channel section 21242 is connected to at least one third flow channel section 2134.

[0098] It should be noted that the above limitations are all described based on a basic unit, which includes: a single first tooth 2111, a single second tooth 2121, a second yoke 2122 and a portion corresponding to a single second groove 2123, and a third yoke 2132 and a portion corresponding to a single third groove 2133.

[0099] In some embodiments of this application, by setting multiple first flow channel sections 2114, first sub-flow channel sections 21241, second sub-flow channel sections 21242, and third flow channel sections 2134, multiple cooling channels can be formed in each basic unit, which can increase the total number of cooling channels of the stator core 21, thereby increasing the contact heat exchange area between the coolant and the stator core 21 and / or the stator winding 22, which is beneficial to further improve the cooling effect of the stator 2.

[0100] It should be noted that some embodiments of this application do not limit the number of first sub-flow channel segments 21241 of a second flow channel segment 2124 that can be simultaneously connected to the first flow channel segment 2114, or the number of second sub-flow channel segments 21242 of a second flow channel segment 2124 that can be simultaneously connected to the third flow channel segment 2134. Those skilled in the art can make adjustments according to actual needs, such as the structural strength and processing difficulty of the stator core 21.

[0101] In some embodiments of this application, the groove in the first core section 211 includes: a first groove 2113, a first tooth 2111 having a first surface facing the first groove 2113, and a first flow channel section 2114 formed on the first surface. It is understood that a first tooth 2111 has two first surfaces that are disposed opposite to each other along the circumference of the stator core 21.

[0102] Specifically, the first flow channel section 2114 is a first groove that is recessed from the first surface away from the first groove portion 2113 along the circumferential direction of the stator core 21. Multiple first grooves are provided, and the multiple first grooves are spaced apart along the axial direction of the stator core 21.

[0103] In some embodiments of this application, since the first flow channel section 2114 is a first groove disposed on the first surface, on the one hand, the coolant flowing through the first groove can not only exchange heat with the first tooth portion 2111, but also exchange heat with the stator 2 winding embedded in the first groove portion 2113, thereby improving the overall cooling effect of the stator 2; on the other hand, it can simplify the structure of the cooling channel, which is beneficial to reducing the processing difficulty of the stator core 21. In addition, since multiple first grooves are provided, the contact heat exchange area between the coolant and the first tooth portion 2111 and the stator 2 winding can be increased, which is beneficial to further improve the cooling effect of the stator 2.

[0104] In some embodiments of this application, the groove in the third core section 213 includes: a third groove 2133, a third yoke 2132 having a fourth surface facing the third groove 2133, and a third flow channel section 2134 formed on the fourth surface.

[0105] Specifically, the third flow channel section 2134 is a fourth groove that is recessed from the fourth surface away from the third groove 2133 along the radial direction of the stator core 21. Multiple fourth grooves are provided, and the multiple fourth grooves are spaced apart along the circumference of the stator core 21.

[0106] In some embodiments of this application, since the third flow channel section 2134 is a fourth groove disposed on the fourth surface, on the one hand, the coolant flowing through the fourth groove can not only exchange heat with the third yoke 2132, but also with the stator 2 winding embedded in the third groove 2133, thereby improving the overall cooling effect of the stator 2; on the other hand, it can simplify the structure of the cooling channel and help reduce the processing difficulty of the stator core 21. In addition, since multiple fourth grooves are provided, the contact heat exchange area between the coolant and the third yoke 2132 and the stator 2 winding can be increased, which is beneficial to further improve the cooling effect of the stator 2.

[0107] In some embodiments of this application, the groove in the second core section 212 includes: a second groove 2123, a second tooth 2121 having a second surface facing the second groove 2123, a first sub-flow channel section 21241 formed on the second surface, a second yoke 2122 having a third surface facing the second groove 2123, and a second sub-flow channel section 21242 formed on the third surface. It is understood that a second tooth 2121 has two second surfaces that are mutually opposite to each other along the axial direction of the stator core 21.

[0108] Specifically, the first sub-flow channel section 21241 is a second groove recessed from the second surface away from the second slot 2123 along the circumferential direction of the stator core 21. Multiple second grooves are provided, spaced apart axially along the stator core 21, and one second groove communicates with at least one first groove. The second sub-flow channel section 21242 is a third groove recessed from the third surface away from the second slot 2123 along the radial direction of the stator core 21. Multiple third grooves are provided, spaced apart circumferentially along the stator core 21, and one third groove communicates with at least one fourth groove. It can be understood that when multiple second grooves are provided, a communication opening is provided between adjacent second grooves spaced apart axially along the stator core 21, so that each second groove can communicate with a third groove.

[0109] In some embodiments of this application, the first sub-flow channel section 21241 is a second groove disposed on the second surface, and the second sub-flow channel section 21242 is a third groove disposed on the third surface. On one hand, the first flow channel section 2114 and the third flow channel section 2134 can be connected by the second groove communicating with at least one first groove and the third groove communicating with at least one fourth groove. On the other hand, the coolant flowing through the second and third grooves can not only exchange heat with the second tooth portion 2121 and the second yoke portion 2122, but also with the stator 2 winding embedded in the second groove portion 2123, thereby improving the overall cooling effect of the stator 2. In addition, the provision of the second and third grooves can simplify the structure of the cooling channel and help reduce the processing difficulty of the stator core 21. Furthermore, since multiple second and third grooves are provided, the contact heat exchange area between the coolant and the second tooth portion 2121, the second yoke portion 2122, and the stator 2 winding can be increased, which is beneficial to further improve the cooling effect of the stator 2.

[0110] It should be noted that the accompanying drawings of this application only show the cases where multiple flow channels are disposed inside the stator core 21 and where multiple flow channels are disposed on the surface of the stator core 21. In practical applications, those skilled in the art may also, as needed, place some flow channels inside the stator core 21 and some flow channels on the surface of the stator core 21, which is not limited here.

[0111] In some embodiments of this application, the first core segment 211 has a first thickness in the radial direction of the stator core 21, the second core segment 212 has a second thickness in the radial direction of the stator core 21, and the third core segment 213 has a third thickness in the radial direction of the stator core 21; wherein the second thickness is less than the first thickness and / or the third thickness.

[0112] Compared to the first flow channel section 2114 of the first core section 211 and the second flow channel section 2124 of the third core section 213, the second flow channel section 2124 of the second core section 212 serves to connect the first flow channel section 2114 and the second flow channel section 2124. Its flow channel structure is more complex than that of the first flow channel section 2114 and the third flow channel section 2134. By designing the second thickness of the second core section 212 to be less than the first thickness of the first core section 211 and / or the second thickness of the third core section 213, not only can the processing difficulty of the stator core 21 be reduced, but the overall structural strength of the stator core 21 can also be improved to a certain extent.

[0113] It should be noted that the specific values ​​of the first thickness, the second thickness, and the third thickness are not limited in the embodiments of this application, and those skilled in the art can make adjustments according to actual needs.

[0114] Referring to Figures 7 to 28, four different stator core structures 21 are provided below. It should be noted that the structure of the stator core 21 includes, but is not limited to, the following embodiments.

[0115] Example 1

[0116] As shown in Figures 17 to 21, the first flow channel section 2114 is formed within the first tooth portion 2111, the first sub-flow channel section 21241 is formed within the second tooth portion 2121, the second sub-flow channel section 21242 is formed within the second yoke portion 2122, and the third flow channel section 2134 is formed within the third yoke portion 2132. That is, the cooling channel formed by the combination of the first flow channel section 2114, the first sub-flow channel section 21241, the second sub-flow channel section 21242, and the third flow channel section 2134 is formed inside the stator core 21. This allows the coolant to fully contact the interior of the stator core 21, which is beneficial for improving the cooling effect of the stator 2.

[0117] Specifically, as shown in Figures 18 and 19, the first flow channel section 2114 is opened in the first toothed portion 2111, the first sub-flow channel section 21241 of the second flow channel section 2124 is opened in the second toothed portion 2121 and communicates with the first flow channel section 2114, the second sub-flow channel section 21242 of the second flow channel section 2124 is opened in the second yoke portion 2122 and communicates with the third flow channel section 2134, and the third flow channel section 2134 is opened in the third yoke portion 2132.

[0118] Furthermore, as shown in Figures 20 and 21, each basic unit contains one first flow channel segment 2114, one first sub-flow channel segment 21241, one second sub-flow channel segment 21242, and one third flow channel segment 2134. Along the radial direction of the stator core 21, one second flow channel segment 2124 (corresponding to the second fluid domain B) is connected to one first flow channel segment 2114 (corresponding to the first fluid domain A), and simultaneously connected to two third flow channel segments 2134 (corresponding to the third fluid domain C).

[0119] Example 2

[0120] As shown in Figures 22 to 28, the difference between Embodiment 2 and other embodiments lies in that Embodiment 2 further includes a connecting groove 2135 that connects the third flow channel section 2134 and the third groove portion 2133. Specifically, the groove portion in the third core section 213 includes: a third groove portion 2133, and the third flow channel section 2134 has a first sidewall near the third groove portion 2133, with the connecting groove 2135 provided on the first sidewall to connect the third flow channel section 2134 and the third groove portion 2133. In this way, the coolant entering the third flow channel section 2134 can not only directly contact and exchange heat with the interior of the stator core 21, but also directly contact and exchange heat with at least a portion of the stator winding 22 located in the third groove portion 2133, thereby further improving the cooling effect of the stator 2.

[0121] Specifically, as shown in Figures 22 to 26, the first flow channel section 2114 is formed within the first tooth portion 2111, the first sub-flow channel section 21241 of the second flow channel section 2124 is formed within the second tooth portion 2121 and communicates with the first flow channel section 2114, the second sub-flow channel section 21242 of the second flow channel section 2124 is formed within the second yoke portion 2122 and communicates with the third flow channel section 2134, and the third flow channel section 2134 is formed within the third yoke portion 2132. The third flow channel section 2134 has a connecting groove 2135 near the first sidewall of the third groove portion 2133, connecting the third flow channel section 2134 and the third groove portion 2133, allowing a portion of the coolant entering the third flow channel section 2134 to directly contact and exchange heat with the stator winding 22.

[0122] Example 3

[0123] As shown in Figures 7 to 11, the groove in the first core section 211 includes: a first groove 2113, a first tooth 2111 having a first surface facing the first groove 2113, and a first flow channel section 2114 formed on the first surface; the groove in the second core section 212 includes: a second groove 2123, a second tooth 2121 having a second surface facing the second groove 2123, a first sub-flow channel section 21241 formed on the second surface, a second yoke 2122 having a third surface facing the second groove 2123, and a second sub-flow channel section 21242 formed on the third surface; the groove in the third core section 213 includes: a third groove 2133, a third yoke 2132 having a fourth surface facing the third groove 2133, and a third flow channel section 2134 formed on the fourth surface. The first flow channel section 2114 is the first groove, the first sub-flow channel section 21241 is the second groove, the third sub-flow channel section is the third groove, and the third flow channel section 2134 is the fourth groove, and the first groove, the second groove, the third groove and the fourth groove are connected in sequence.

[0124] In some embodiments of this application, a cooling channel formed by combining a first flow channel section 2114, a first sub-flow channel section 21241, a second sub-flow channel section 21242, and a third flow channel section 2134 is formed on the surface of the stator core 21. Specifically, the cooling channel is enclosed by a first groove, a second groove, a third groove, a fourth groove, and a stator winding 22 embedded in the groove. This not only simplifies the processing difficulty of the cooling channel and helps reduce the processing cost of the stator core 21, but also allows the coolant to directly contact and exchange heat with at least a portion of the stator core 21 and the stator winding 22 simultaneously, which further improves the cooling effect of the stator 2. In practical applications, the stator winding 22 includes a conductor and an insulating component, with the insulating component disposed between the conductor and the stator core 21. That is, the aforementioned cooling channel is enclosed by the insulating component of the stator core 21 and the stator winding 22.

[0125] Specifically, as shown in Figures 8 and 9, a first groove is formed on the first surface of the first tooth 2111, a second groove is formed on the second surface of the second tooth 2121 and communicates with the first groove, a third groove is formed on the third surface of the second yoke 2122 and communicates with the fourth groove, and a fourth groove is formed on the fourth surface of the third yoke 2132. Specifically, one first surface has three first grooves, which are spaced apart along the axial direction of the stator core 21; one second surface has one second groove; one third surface has two third grooves, which are spaced apart along the circumferential direction of the stator core 21 and communicate with the second grooves located on the second surfaces of two adjacent second teeth 2121; and one fourth surface has one fourth groove, which simultaneously communicates with the two third grooves located on the third surface. As shown in Figures 10 and 11, in this embodiment of the application, along the radial direction of the stator core 21, a second flow channel segment 2124 (corresponding to the second fluid domain B) is connected to six first flow channel segments 2114 (corresponding to the first fluid domain A), and is also connected to a third flow channel segment 2134 (corresponding to the third fluid domain C).

[0126] Example 4

[0127] As shown in Figures 12 to 16, the difference between Embodiment 4 and Embodiment 3 is that a fourth surface is provided with two fourth grooves, which are spaced apart along the circumference of the stator core 21, and one fourth groove is connected to a corresponding third groove located on the third surface. As shown in Figures 15 and 16, in some embodiments of this application, along the radial direction of the stator core 21, a second flow channel segment 2124 (corresponding to the second fluid domain B) is connected to three first flow channel segments 2114 (corresponding to the first fluid domain A), and simultaneously connected to a third flow channel segment 2134 (corresponding to the third fluid domain C).

[0128] In summary, the motors provided in some embodiments of this application have at least the following advantages:

[0129] In some embodiments of this application, the stator core is provided with cooling channels extending radially along the stator core, with some flow channels located in the tooth section and others in the yoke section. Thus, when coolant is introduced into the cooling channels, the coolant can contact and exchange heat with both the tooth section and the yoke section of the stator core, increasing the contact area between the coolant and the stator core. This achieves sufficient cooling of the stator core and further improves the stator's cooling effect.

[0130] Some embodiments of this application also provide a stator 2, including the stator core 21 described above. In this way, by providing cooling channels in the stator core 21, with some flow channels located in the tooth section and others in the yoke section, when coolant is introduced into the cooling channels, the coolant can contact and exchange heat with the tooth section and yoke section of the stator core 21 respectively, thereby achieving sufficient cooling of the stator core 21 and further improving the cooling effect of the stator 2.

[0131] It should be noted that in some embodiments of this application, the structure of the stator core 21 is the same as that of the stator core 21 in any of the above embodiments, and its beneficial effects are similar, so it will not be described in detail here.

[0132] Furthermore, the stator 2 also includes a stator 2 winding, which is connected to the stator core 21. Specifically, the stator core 21 includes slots, and at least a portion of the stator 2 winding is embedded in the slots, thereby achieving a reliable connection between the stator 2 winding and the stator core 21.

[0133] As shown in Figures 1 to 6, some embodiments of this application also provide an electric motor, including the stator 2 described above. By cooling the stator core 21, the cooling effect of the stator 2 can be improved, thereby improving the operational reliability of the electric motor.

[0134] It should be noted that in some embodiments of this application, the structure of the stator 2 is the same as that of the stator 2 in any of the above embodiments, and its beneficial effects are similar, so it will not be described in detail here.

[0135] In some embodiments of this application, the motor further includes a housing 1, a stator 2 disposed inside the housing 1, and a stator core 21 having two peripheral walls spaced radially apart along the stator core 21. One peripheral wall and the housing 1 form a cooling chamber 4, and a cooling channel is used to connect the two cooling chambers 4.

[0136] In some embodiments of this application, since the housing 1 is provided with two cooling chambers 4, the heat exchange contact area between the stator core 21 and the coolant can be increased. Since the cooling channel connects the two cooling chambers 4, the coolant can circulate, which is beneficial to improving the cooling effect of the stator 2.

[0137] In practical applications, the motor also includes a rotor 5, which is disposed within the housing 1. The rotor 5 and the stator 2 are spaced apart axially along the stator 2 to form an air gap. To prevent coolant leakage into the air gap and thus reduce motor performance, in some embodiments of this application, the motor also includes a seal 3, which is disposed at one end of the stator core 21 along the axial direction. The seal 3, the peripheral wall, and the housing 1 form a cooling chamber 4.

[0138] In some embodiments of this application, a sealing element 3 is provided, and the sealing element 3, together with the peripheral wall and the housing 1, forms a cooling chamber 4. This improves the sealing performance of the cooling chamber 4, effectively preventing coolant leakage into the air gap between the stator 2 and the rotor 5, which is beneficial to improving the working performance of the motor.

[0139] It should be noted that, in order to further improve the sealing effect between the seal 3 and the housing 1, the motor in this embodiment of the application also includes a first sealing ring, which is disposed between the seal 3 and the housing 1 to achieve a sealed connection between the seal 3 and the housing 1. Specifically, as shown in FIG4, the housing 1 includes an end plate 11, a first side plate 12, and a second side plate 13. The end plate 11 is disposed at the end of the stator core 21 away from the seal 3. The first side plate 12 and the second side plate 13 extend circumferentially along the end plate 11 and are distributed at intervals in the radial direction of the stator 2, with the second side plate 13 close to the center of the end plate 11. The seal 3 is annular, and the outer annular surface of the seal 3 is connected to the first side plate 12, and the inner annular surface of the seal 3 is connected to the second side plate 13. Two first sealing rings are provided: one first sealing ring is disposed between the outer annular surface of the seal 3 and the first side plate 12, and the other first sealing ring is disposed between the inner annular surface of the seal 3 and the second side plate 13, thereby achieving a sealed connection between the seal 3 and the housing 1.

[0140] In some embodiments of this application, as shown in FIG4, the housing 1 includes: an end plate 11, a first side plate 12, and a second side plate 13. The end plate 11 is disposed at the end of the stator core 21 away from the sealing member 3. The first side plate 12 and the second side plate 13 are both connected to the end plate 11 and are arranged radially at intervals along the stator core 21. The second side plate 13 is close to the center of the end plate 11. The peripheral wall includes a first peripheral wall 214 and a second peripheral wall 215. The cooling chamber 4 includes a first cooling chamber 41 and a second cooling chamber 42. The first cooling chamber 41 is surrounded by the end plate 11, the first side plate 12, the sealing member 3, and the first peripheral wall 214. The second cooling chamber 42 is surrounded by the end plate 11, the second side plate 13, the sealing member 3, and the second peripheral wall 215. The first cooling chamber 41 and the second cooling chamber 42 are respectively formed on the outer and inner sides of the stator core 21. In this way, the cooling channel formed on the stator core 21 can realize the connection between the first cooling chamber 41 and the second cooling chamber 42, thereby realizing the circulation of coolant and improving the cooling effect of the stator 2.

[0141] It should be noted that the second side plate 13 can be integrally formed with the end plate 11 and the first side plate 12, or it can be integrally formed with the seal 3. This is not limited here, and those skilled in the art can adjust it according to actual needs. It is understood that when the second side plate 13 is integrally formed with the end plate 11 and the first side plate 12, the second side plate 13 should be made of the same material as the end plate 11 and the first side plate 12, such as metal, thereby improving the structural strength of the housing 1. When the second side plate 13 is integrally formed with the seal 3, the second side plate 13 should be made of the same material as the seal 3, such as non-metallic material, thereby reducing the overall weight of the motor.

[0142] In some embodiments of this application, the housing 1 further includes a liquid inlet channel 14 and a liquid outlet channel 15. The liquid inlet channel 14 is connected to one of the first cooling chamber 41 or the second cooling chamber 42, and the liquid outlet channel 15 is connected to the other of the first cooling chamber 41 or the second cooling chamber 42. In this way, when the liquid inlet channel 14 and the liquid outlet channel 15 are respectively connected to an external cooling device, the coolant can be circulated, thereby improving the cooling effect of the stator 2.

[0143] Specifically, taking the example of the inlet channel 14 connecting to the first cooling chamber 41 and the outlet channel 15 connecting to the second cooling chamber 42, the coolant from the cooling device enters the first cooling chamber 41 through the inlet channel 14, and then enters the second cooling chamber 42 through the cooling channels of the stator core 21 (i.e., multiple connected flow channels), finally flowing back to the cooling device from the outlet channel 15, thus forming a cooling circuit. During this process, the coolant can always fill the entire first cooling chamber 41 and the second cooling chamber 42, meaning that at least a portion of the stator core 21 and stator windings 22 can be directly immersed in the coolant, allowing the stator 2 to fully contact and exchange heat with the coolant, which is beneficial for further improving the cooling effect of the stator 2. Thus, for the same motor volume, when the cooling effect of the stator 2 is improved, the motor temperature decreases. On the one hand, this can increase the permanent magnet flux linkage and output torque of the motor, thereby increasing the torque density and efficiency of the motor. On the other hand, a larger current can be supplied to the stator winding 22 of the motor (increasing the electrical load), thereby increasing the output torque and power, and thus improving the torque density and power density. Under the condition that the motor meets the same torque and power requirements, the size and weight of the motor can be further reduced, which is beneficial to the electric drive system and the overall vehicle space layout, and also to the overall vehicle weight reduction.

[0144] In some embodiments of this application, the liquid inlet channel 14 is disposed on the end plate 11 and / or the first side plate 12; or the liquid outlet channel 15 is disposed on the end plate 11 and / or the first side plate 12.

[0145] In some embodiments of this application, by directly integrating the liquid inlet channel 14 onto the end plate 11 and / or the first side plate 12, or by directly integrating the liquid outlet channel 15 onto the end plate 11 and / or the first side plate 12, this arrangement not only avoids the inconvenience of pipe connection, but also allows the liquid inlet channel 14 and the liquid outlet channel 15 to be as close as possible to the cooling chamber 4 (including the first cooling chamber 41 and the second cooling chamber 42), which is beneficial to improving the cooling effect.

[0146] It should be noted that, taking one inlet channel 14 or outlet channel 15 as an example, there are three ways to set them: (1) only on the end plate 11, (2) only on the first side plate 12, and (3) simultaneously on both the end plate 11 and the first side plate 12. Those skilled in the art can choose according to actual needs. In addition, the embodiments of this application do not limit the number of inlet channels 14 and outlet channels 15. Those skilled in the art can adjust them according to actual needs. In one embodiment, the motor includes two housings 1 that are arranged opposite to each other along the axial direction of the stator 2 and connected to each other. For each housing 1, only one inlet channel 14 and one outlet channel 15 can be set, or multiple inlet channels 14 and multiple outlet channels 15 can be set. There is no limitation here. Those skilled in the art can adjust them according to actual needs.

[0147] In some embodiments of this application, the liquid inlet channel 14 is a liquid inlet hole, and / or the liquid outlet channel 15 is a liquid outlet hole. This further simplifies the structure of the liquid inlet channel 14 and the liquid outlet channel 15, reducing the processing difficulty of the housing 1. As shown in FIG2, in one embodiment, the liquid inlet channel 14 is disposed on the end plate 11 and communicates with the second cooling chamber 42 located on the inner side, and the liquid outlet channel 15 is a liquid outlet hole disposed on the first side plate 12 to communicate with the first cooling chamber 41 located on the outer side.

[0148] In some embodiments of this application, the housing 1 further includes a junction box disposed on the side of the first side plate 12 opposite to the second side plate 13, and the junction box is used for electrical connection with the stator winding 22. Specifically, a mounting cavity 16 is provided on the side of the first side plate 12 opposite to the second side plate 13, and the junction box is disposed in the mounting cavity 16.

[0149] In some embodiments of this application, the current in the stator winding 22 can be controlled in real time through the connection between the junction box and the motor controller, and the connection between the motor controller and the power supply, thereby realizing real-time control and switching of the motor's operating conditions. Furthermore, by placing the junction box on the side of the first side plate 12 away from the second side plate 13, i.e., placing the junction box on the periphery of the housing 1, the axial dimension of the motor can be further reduced, which is beneficial for the miniaturization design of the motor.

[0150] In some embodiments, the junction box and the stator winding 22 are electrically connected via lead wires. The first side plate 12 has a through hole at a position corresponding to the first cooling chamber 41, and the lead wire is connected to the stator winding 22 by passing through the through hole. In another embodiment, the end plate 11 has a through hole at a position corresponding to the first cooling chamber 41, and the lead wire is connected to the stator winding 22 by passing through the through hole. It should be noted that, in order to prevent coolant leakage from the gap between the lead wire and the through hole, a sealing treatment is required between the lead wire and the through hole, for example, by setting a sealing ring.

[0151] In some embodiments of this application, as shown in the figures, the motor further includes a rotor 5 and a shaft 6. The rotor 5 is disposed within the housing 1, and the rotor 5 and the stator 2 are spaced apart axially along the stator 2. The shaft 6 passes through the housing 1, the stator 2, and the rotor 5 along the axial direction of the stator 2. The shaft 6 is fixedly connected to the rotor 5 and rotatably connected to the housing 1, so that the rotor 5 can rotate relative to the stator 2. Thus, during motor operation, the electromagnetic interaction between the stator 2 and the rotor 5 drives the rotor 5 to rotate and output power. By spaced the rotor 5 and the stator 2, i.e., by creating a certain air gap between them, the electromagnetic interaction area can be precisely controlled, reducing leakage flux and reluctance loss, which is beneficial for improving the energy conversion efficiency and output power of the motor.

[0152] It should be noted that the accompanying drawings of some embodiments of this application only show the case where the motor is a dual stator 2 / single rotor 5 motor. In actual applications, the motor in the embodiments of this application can also be a single stator 2 / single rotor 5 motor, or an N stator 2 / (N-1) rotor 5 (N>2) motor. There is no limitation here, and those skilled in the art can make adjustments according to actual needs.

[0153] In some embodiments, the housing 1 further includes a bearing chamber disposed on the end plate 11 and located inside the second side plate 13, for mounting a bearing 7. The bearing 7 is sleeved on the rotating shaft 6, and the outer ring of the bearing 7 is fixedly connected to the inner wall of the bearing chamber, while the inner ring of the bearing 7 is fixedly connected to the rotating shaft 6, allowing the rotating shaft 6 to rotate relative to the housing 1. Furthermore, the motor also includes a position sensor disposed within the housing 1 and close to the rotating shaft 6, thereby transmitting the motor's position information to the motor controller in real time during motor operation.

[0154] Some embodiments of this application also provide a powertrain, including the aforementioned motor. The powertrain can be a pure electric powertrain, a hybrid powertrain, or other types, and can be equipped with any drive architecture, such as centralized drive, four-wheel drive, two-wheel drive, wheel-side drive, etc.

[0155] Some embodiments of this application also provide a vehicle including the aforementioned motor or powertrain.

[0156] It should be noted that in this embodiment, the structure of the motor is the same as that of the motor in any of the above embodiments, and its beneficial effects are similar, so it will not be described in detail here.

[0157] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0158] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A stator, comprising a stator core, wherein, include: The yoke and teeth are arranged sequentially along the axial direction of the stator core, and The cooling channel extends radially along the stator core and includes multiple interconnected flow channel segments, some of which are located in the tooth section and some of which are located in the yoke section.

2. The stator according to claim 1, wherein, The toothed portion is provided in multiple ways, and the multiple toothed portions are arranged at intervals along the circumference of the stator core. A slot is formed between two adjacent toothed portions, and the slot is used to install the stator winding. The yoke includes a near-groove region close to the groove, and the flow channel section disposed in the yoke is located in the near-groove region.

3. The stator according to claim 2, wherein, The stator core includes a first core segment, a second core segment, and a third core segment arranged sequentially from the outside to the inside along the radial direction of the stator core. The first core segment includes a first tooth and a first yoke. The second core segment includes a second tooth and a second yoke. The third core segment includes a third tooth and a third yoke. The flow channel section includes a first flow channel section, a second flow channel section, and a third flow channel section arranged sequentially from the outside to the inside along the radial direction of the stator core. The first flow channel section is disposed on the first tooth portion, the second flow channel section is disposed on the second tooth portion and the second yoke portion, and the third flow channel section is disposed on the third yoke portion.

4. The stator according to claim 3, wherein, The second flow channel section includes: a first sub-flow channel section and a second sub-flow channel section that are interconnected; The first sub-flow channel segment is disposed on the second tooth portion, and the end of the first sub-flow channel segment opposite to the second sub-flow channel segment is connected to the first flow channel segment; The second sub-flow channel segment is disposed on the second yoke, and the end of the second sub-flow channel segment opposite to the first sub-flow channel segment is connected to the third flow channel segment.

5. The stator according to claim 4, wherein, The first flow channel section is formed within the first tooth portion, the first sub-flow channel section is formed within the second tooth portion, the second sub-flow channel section is formed within the second yoke portion, and the third flow channel section is formed within the third yoke portion.

6. The stator according to claim 5, wherein, The groove in the third core section includes: a third groove, the third flow channel section having a first sidewall near the third groove, the first sidewall being provided with a connecting groove to allow the third flow channel section to communicate with the third groove.

7. The stator according to claim 5, wherein, Multiple first flow channel segments are provided, and the multiple first flow channel segments are arranged at intervals along the circumference of the stator core on the first tooth portion.

8. The stator according to claim 7, wherein, Multiple third flow channels are provided, and the multiple third flow channels are arranged at intervals along the circumference of the stator core in the third yoke.

9. The stator according to claim 8, wherein, Multiple first sub-flow channel segments are provided, and the multiple first sub-flow channel segments are arranged at intervals along the circumference of the stator core on the second tooth portion. One first sub-flow channel segment is connected to at least one first flow channel segment. Multiple second sub-flow channels are provided, and the multiple second sub-flow channels are arranged at intervals along the circumference of the stator core in the second yoke. One second sub-flow channel is connected to at least one third flow channel.

10. The stator according to claim 4, wherein, The groove in the first core section includes: a first groove, a first tooth having a first surface facing the first groove, and a first flow channel section formed on the first surface.

11. The stator according to claim 10, wherein, The first flow channel section is a first groove that is recessed from the first surface away from the first slot along the circumferential direction of the stator core. Multiple first grooves are provided, and the multiple first grooves are spaced apart along the axial direction of the stator core.

12. The stator according to claim 11, wherein, The groove in the third core section includes: a third groove, the third yoke having a fourth surface facing the third groove, and the third flow channel section being formed on the fourth surface.

13. The stator according to claim 12, wherein, The third flow channel section is a fourth groove that is recessed from the fourth surface away from the third slot along the radial direction of the stator core. Multiple fourth grooves are provided, and the multiple fourth grooves are spaced apart along the circumference of the stator core.

14. The stator according to claim 13, wherein, The groove portion in the second core section includes: a second groove portion, a second tooth portion having a second surface facing the second groove portion, a first sub-flow channel portion formed on the second surface, a second yoke portion having a third surface facing the second groove portion, and a second sub-flow channel portion formed on the third surface.

15. The stator according to claim 14, wherein, The first sub-flow channel section is a second groove that is recessed from the second surface away from the second slot along the circumferential direction of the stator core. Multiple second grooves are provided, and the multiple second grooves are spaced apart along the axial direction of the stator core. One second groove communicates with at least one first groove. The second sub-flow channel section is a third groove that is recessed from the third surface away from the second slot along the radial direction of the stator core. Multiple third grooves are provided, and the multiple third grooves are spaced apart along the circumference of the stator core. One third groove communicates with at least one fourth groove.

16. The stator according to any one of claims 3-15, wherein, The first core segment has a first thickness in the radial direction of the stator core, the second core segment has a second thickness in the radial direction of the stator core, and the third core segment has a third thickness in the radial direction of the stator core; Wherein, the second thickness is less than the first thickness and / or the third thickness.

17. An electric motor, wherein, Includes the stator as described in any one of claims 1 to 16.

18. The motor according to claim 17, wherein, The motor also includes a housing, the stator is disposed within the housing, the stator core has two peripheral walls spaced radially apart along the stator core, one of the peripheral walls and the housing forming a cooling chamber, and the cooling channel is used to connect the two cooling chambers.

19. The motor according to claim 18, wherein, The motor also includes a seal, which is disposed at one end of the stator core along the axial direction, and the seal, the peripheral wall, and the housing form the cooling chamber.

20. The motor according to claim 19, wherein, The housing includes an end plate, a first side plate, and a second side plate. The end plate is disposed at the end of the stator core away from the sealing element. The first side plate and the second side plate are both connected to the end plate and are arranged at radial intervals along the stator core. The second side plate is close to the center of the end plate. The peripheral wall includes a first peripheral wall and a second peripheral wall, and the cooling chamber includes a first cooling chamber and a second cooling chamber. The first cooling chamber is surrounded by the end plate, the first side plate, the sealing element and the first peripheral wall, and the second cooling chamber is surrounded by the end plate, the second side plate, the sealing element and the second peripheral wall.

21. The motor according to claim 20, wherein, The housing further includes a liquid inlet channel and a liquid outlet channel, wherein the liquid inlet channel is connected to one of the first cooling chamber or the second cooling chamber, and the liquid outlet channel is connected to the other of the first cooling chamber or the second cooling chamber.

22. The motor according to claim 21, wherein, The liquid inlet channel is disposed on the end plate and / or the first side plate; Alternatively, the liquid outlet channel may be disposed on the end plate and / or the first side plate.

23. The motor according to claim 21 or 22, wherein, The liquid inlet channel is a liquid inlet hole, and / or the liquid outlet channel is a liquid outlet hole.

24. The motor according to any one of claims 19 to 23, wherein, The motor also includes a first sealing ring, which is disposed between the sealing element and the housing to make the sealing element and the housing sealed together.

25. A powertrain, wherein, Includes the motor as described in any one of claims 17-24.

26. A vehicle, wherein, Includes the motor as described in any one of claims 17-24, or the powertrain as described in claim 25.

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