Stator core and motor

Abstract

The utility model discloses a stator core and a motor, the outer wall of the stator core is provided with a plurality of first flow channels and a plurality of second flow channels, the plurality of first flow channels are distributed at intervals along the circumferential direction of the stator core, and the adjacent first flow channels are communicated through the second flow channels. The outer wall of the stator iron core is further provided with a plurality of first protruding blocks which are distributed in the first flow channels in a net shape, and the adjacent first protruding blocks are arranged in a staggered mode in the axial direction of the stator iron core. The outer wall of the stator core is provided with the first flow channel and the second flow channel which are communicated with each other, so that the cooling liquid and the stator core can directly exchange heat, the temperature of the stator core is reduced, the motor is cooled, and the stability and reliability of the motor in the working process are guaranteed. And meanwhile, each first bump not only can enable the cooling liquid to stably and smoothly flow in the first flow channel along the extension direction of the first flow channel so as to guarantee the flowing property of the cooling liquid, but also can be in interference fit with the inner wall of the shell so as to improve the stability and reliability of stator iron core installation.

Description

Technical Field

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

[0002] With the development of new energy vehicles, the requirements for motor speed, torque density and power density are getting higher and higher. During the operation of the motor, the stator winding and stator core will generate a lot of heat, so it is necessary to cool them down to ensure that the motor has stable output performance and a long service life.

[0003] Currently, the stator core is mainly cooled by spraying. However, since the spray pipe is usually located above the stator core, the coolant sprayed from the spray pipe cannot completely cover the outer surface of the stator core, resulting in a low coolant coverage rate and thus a poor overall cooling effect of the coolant on the motor. Utility Model Content

[0004] In view of this, this application provides a stator core and a motor to solve the technical problem in the prior art where the coolant cannot completely cover the outer surface of the stator core, resulting in poor cooling effect.

[0005] This application provides a stator core, wherein the outer wall of the stator core is provided with a plurality of first flow channels and a plurality of second flow channels, the plurality of first flow channels are distributed at intervals along the circumference of the stator core, and adjacent first flow channels are connected through the second flow channels.

[0006] The stator core is provided with a plurality of first protrusions on its outer wall. The plurality of first protrusions are distributed in a mesh pattern in each of the first flow channels, and adjacent first protrusions are staggered along the axial direction of the stator core.

[0007] In this embodiment, by providing a first cooling channel on the outer wall of the stator core, heat exchange can be directly performed between the coolant and the stator core. The flowing coolant carries away the heat generated by the stator core during operation, thereby reducing the temperature of the stator core and cooling down the motor. This reduces the possibility of the motor burning out due to high temperature and helps ensure the stability and reliability of the motor during operation.

[0008] Meanwhile, by setting multiple first protrusions in a mesh-like distribution in the first flow channel, the coolant can directly exchange heat with the sidewalls of each first protrusion during the flow of the first flow channel, thereby further increasing the contact area between the coolant and the stator core and improving the efficiency of heat exchange between the two, thus further improving the cooling effect of the coolant on the stator core.

[0009] Specifically, the multiple first protrusions distributed in a mesh pattern can guide the flow of coolant within the first flow channel, ensuring stable and smooth flow of the coolant along its extension direction (i.e., the axial direction of the stator core), thereby guaranteeing the cooling effect of the coolant on the stator core. Furthermore, the multiple first protrusions increase the contact area between the stator core and the housing. When the stator core is installed in the housing, each first protrusion can be interference-fitted with the inner wall of the housing along the radial direction of the stator core, improving the stability and reliability of the stator core installation.

[0010] In one possible implementation, the stator core includes a body portion and a plurality of isolation portions. The plurality of isolation portions are distributed circumferentially around the outer wall of the body portion, and a first flow channel is formed between adjacent isolation portions. Along the radial direction of the stator core, the outer surface of the isolation portion and the outer surface of the first protrusion are located on the same arc.

[0011] In one possible implementation, the stator core further includes a first end and a second end disposed opposite to each other along its axial direction, a portion of the isolation portion being connected to the first end and forming a second flow channel between the second end and the second end, and a portion of the isolation portion being connected to the second end and forming a second flow channel between the first end and the second end.

[0012] In one possible implementation, the body portion includes a first body and two second bodies. The two second bodies are distributed on both sides of the first body along the axial direction of the stator core. The outer wall of the first body is provided with a first protrusion, and the outer wall of the second body is provided with a plurality of second protrusions. The plurality of second protrusions are distributed at intervals along the circumference of the stator core at the ends of the first flow channel, and adjacent first protrusions and second protrusions are staggered along the axial direction of the stator core.

[0013] In one possible implementation, each of the first flow channels further includes a first protrusion region and a second protrusion region, the second protrusion region being located at both ends of the first protrusion region along the axial direction of the stator core, a plurality of first protrusions being provided in the first protrusion region, and a plurality of second protrusions being provided in the second protrusion region.

[0014] Along the direction from the first protruding region toward the second protruding region located at the first end, the number of the first protrusions at the end of the first protruding region is N1, and along the direction from the second protruding region at the first end toward the first protruding region, the number of the second protrusions at the end of the second protruding region is N1-1.

[0015] Along the direction from the first protruding region toward the second protruding region located at the second end, the number of the first protrusions at the end of the first protruding region is N2, and along the direction from the second protruding region at the second end toward the first protruding region, the number of the second protrusions at the end of the second protruding region is N2-1.

[0016] Among them, N1 and N2 satisfy N1≥2 and N2≥2.

[0017] In one possible implementation, the stator core includes a plurality of first laminations and a plurality of second laminations, the plurality of first laminations being stacked along the axial direction of the stator core to form a first body, and the plurality of second laminations being stacked along the axial direction of the stator core to form a second body.

[0018] Along the circumference of the stator core, the outer peripheral wall of each of the first laminations is provided with a plurality of spaced first rib structures, and the plurality of first rib structures are stacked along the axial direction of the stator core to form the first protrusion area. The outer peripheral wall of each of the second laminations is provided with a plurality of spaced second rib structures, and the plurality of second rib structures are stacked along the axial direction of the stator core to form the second protrusion area.

[0019] Along the axial direction of the stator core, some adjacent first rib structures are staggered by a preset angle, and two second rib structures located on both sides of the first body are staggered by a preset angle.

[0020] In one possible implementation, the first rib structure includes a first region and a second region, which are alternately arranged along the circumference of the stator core. A first rib is provided in both the first region and the second region, and multiple first ribs are stacked along the axial direction of the stator core to form each first protrusion.

[0021] Each region also has a first groove between adjacent first protrusions, and multiple first grooves are stacked along the axial direction of the stator core to form the first flow channel.

[0022] Wherein, the number of the first ribs in the first region is X1, the number of the first ribs in the second region is X2, and X1 and X2 satisfy X1-X2≥1.

[0023] In one possible implementation, the second rib structure includes a third region and a fourth region, which are alternately arranged along the circumference of the stator core. A second rib is provided in both the third region and the fourth region, and multiple second ribs are stacked along the axial direction of the stator core to form each second protrusion.

[0024] Each region has a second groove between adjacent second ribs, and multiple second grooves are stacked along the axial direction of the stator core to form the first flow channel. The third region and the fourth region also have a third groove, and multiple third grooves are stacked along the axial direction of the stator core to form the second flow channel.

[0025] Wherein, the number of the second ribs in the third region is X3, the number of the second ribs in the fourth region is X4, and X3 and X4 satisfy X3-X4≥1.

[0026] In one possible implementation, along the circumferential direction of the stator core, the outer peripheral wall of each lamination is provided with a plurality of spaced isolation ribs, the isolation ribs being located between adjacent first rib structures and adjacent second rib structures, and the plurality of isolation ribs being stacked along the axial direction of the stator core to form each isolation portion.

[0027] In this embodiment, at least one of the plurality of isolation ribs of each lamination is provided with a positioning part, and the projections of the positioning parts of some of the laminations overlap along the axial direction of the stator core.

[0028] This application also provides an electric motor, which includes a housing and a stator core. The housing has a receiving cavity, and the side wall of the receiving cavity is provided with a liquid inlet and a liquid outlet. The stator core is installed in the receiving cavity, and the stator core is any of the stator cores described above.

[0029] Wherein, along the radial direction of the stator core, at least a portion of the stator core abuts against the inner wall of the receiving cavity, so that the stator core and the inner wall of the receiving cavity form the first flow channel and the second flow channel.

[0030] In this embodiment of the application, by providing a first flow channel and a second flow channel that are interconnected on the stator core, a first cooling flow channel extending in a serpentine structure can be formed on the outer wall of the stator core. This allows the coolant in the flow channel to flow both along the axial direction and the circumferential direction of the stator core, thereby giving the coolant a longer flow path and improving the heat exchange effect between the coolant and the outer wall of the stator core.

[0031] Meanwhile, by setting multiple first protrusions and multiple second protrusions in each first cooling channel, the contact area between the coolant and the stator core can be further increased, and the possibility of dead water zones appearing in the coolant during the flow process can be reduced, thereby improving the flow performance of the coolant in the first cooling channel.

[0032] It should be understood that the above general description and the following detailed description are merely exemplary and do not limit this application. Attached Figure Description

[0033] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 This is a schematic diagram of the stator core provided in this application in a specific embodiment;

[0035] Figure 2 This is a schematic diagram of the structure of the first body provided in this application in a specific embodiment;

[0036] Figure 3 This is a schematic diagram of the structure of the first stacked wafer provided in this application in a specific embodiment;

[0037] Figure 4 This is a schematic diagram of the structure of the second body provided in this application in a specific embodiment;

[0038] Figure 5 This is a schematic diagram of the structure of the second lamination provided in this application in a specific embodiment.

[0039] Explanation of reference numerals in the attached figures:

[0040] 1-Body part;

[0041] 11-First ontology;

[0042] 111 - First protruding area;

[0043] 111a - First bump;

[0044] 12-Second Body;

[0045] 121 - Second protruding area;

[0046] 121a - Second bump;

[0047] 13-Isolation Department;

[0048] 14 - First cooling channel;

[0049] 141 - First flow channel;

[0050] 142 - Second flow channel;

[0051] 2-end;

[0052] 21-First end;

[0053] 22 - Second end;

[0054] 23 - Second cooling channel;

[0055] 3-Stacked sheets;

[0056] 31-First stack;

[0057] 311 - First convex rib structure;

[0058] 311a - First Region;

[0059] 311b - Second Region;

[0060] 311c - First rib;

[0061] 311d - First groove;

[0062] 32-Second stack;

[0063] 321 - Second convex rib structure;

[0064] 321a - Third Region;

[0065] 321b - Fourth Region;

[0066] 321c - Second rib;

[0067] 321d - Second groove;

[0068] 321e - Third groove;

[0069] 33-Separation reinforcement;

[0070] 331 - Positioning section.

[0071] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. Detailed Implementation

[0072] To better understand the technical solution of this application, the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0073] It should be understood that the described embodiments are merely some, not all, of the embodiments in 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.

[0074] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0075] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0076] Embodiments of this application provide a stator core, such as Figure 1 As shown, the outer wall of the stator core is provided with a first cooling channel 14 for the flow of coolant. The first cooling channel 14 includes a plurality of first channels 141 and a plurality of second channels 142. The plurality of first channels 141 extend along the axial direction of the stator core and are distributed at intervals along the circumferential direction of the stator core, and adjacent first channels 141 are connected through second channels 142.

[0077] In this embodiment, by providing a first cooling channel 14 on the outer wall of the stator core, heat exchange can be directly performed between the coolant and the stator core. The flowing coolant carries away the heat generated by the stator core during operation, thereby reducing the temperature of the stator core and cooling down the motor. This reduces the possibility of the motor burning out due to high temperature and helps ensure the stability and reliability of the motor during operation.

[0078] The first cooling channel 14 includes multiple first channels 141 and multiple second channels 142. The multiple first channels 141 are distributed circumferentially along the stator core, and adjacent first channels 141 are connected by second channels 142. This design allows the first cooling channels 14 to occupy a large area on the outer wall of the stator core, enabling the coolant to flow along most of the outer wall. This increases the contact area between the coolant and the stator core, thereby improving the efficiency of heat exchange and enhancing the cooling effect on the stator core.

[0079] Specifically, the extension direction of each first flow channel 141 can be parallel to the axial direction of the stator core and / or inclined at an angle relative to the axial direction of the stator core, and the extension direction of each second flow channel 142 can be parallel to the circumferential direction of the stator core and / or inclined at an angle relative to the circumferential direction of the stator core, so that each first flow channel 141 and at least one adjacent second flow channel 142 are perpendicular or inclined to each other. This design results in the first cooling flow channel 14 having an overall serpentine structure extending circumferentially along the stator core, thereby providing a large contact area between the coolant and the stator core.

[0080] In one possible implementation, two adjacent first flow channels 141 can be connected by a second flow channel 142 along the circumferential direction of the stator core. For example, along the axial direction of the stator core, multiple second flow channels 142 can all be located on the same side of each first flow channel 141, or multiple second flow channels 142 can be alternately distributed on different sides of two adjacent first flow channels 141 along the circumferential direction of the stator core.

[0081] In one possible implementation, two adjacent first flow channels 141 can be connected by a plurality of second flow channels 142 along the circumferential direction of the stator core. For example, along the axial direction of the stator core, the plurality of second flow channels 142 can be located on both sides of each first flow channel 141, so that two adjacent first flow channels 141 can be connected by two second flow channels 142.

[0082] Preferably, such as Figure 1 As shown, the extension direction of each first flow channel 141 is parallel to the axial direction of the stator core, and the extension direction of each second flow channel 142 is parallel to the circumferential direction of the stator core. Along the circumferential direction of the stator core, two adjacent first flow channels 141 are connected by a second flow channel 142, and along the axial direction of the stator core, two adjacent second flow channels 142 are staggered.

[0083] In this embodiment, the outer wall of the stator core is further provided with a plurality of first protrusions 111a. These first protrusions 111a are distributed in a mesh pattern within each first flow channel 141, and adjacent first protrusions 111a are staggered along the axial direction of the stator core. This design allows the coolant to directly exchange heat with the sidewalls of each first protrusion 111a during its flow within the first flow channel 141, further increasing the contact area between the coolant and the stator core and improving the efficiency of heat exchange. This, in turn, enhances the cooling effect of the coolant on the stator core. Furthermore, along the axial direction of the stator core, the multiple first protrusions 111a can divide the first flow channel 141 with a larger flow area into multiple staggered first flow channels 141 with smaller flow areas. This improves the uniformity of coolant distribution within the first flow channels 141, further enhancing the efficiency of heat exchange between the coolant and the stator core, and thus further improving the cooling effect on the stator core.

[0084] The multiple first protrusions 111a distributed in a mesh pattern can also guide the flow of coolant in the first flow channel 141, so that the coolant can flow stably and smoothly in the first flow channel 141 along its extension direction (i.e., the axial direction of the stator core), thereby ensuring the cooling effect of the coolant on the stator core.

[0085] Meanwhile, the multiple first protrusions 111a can also increase the contact area between the stator core and the housing. When the stator core is installed in the housing, each first protrusion 111a can be interference-fitted with the inner wall of the housing along the radial direction of the stator core to improve the stability and reliability of the stator core installation.

[0086] In addition, the number of first protrusions 111a in the first flow channel 141 can be adjusted to control the heat dissipation area and installation effect of the stator core, so that stator cores with different parameters can have good heat dissipation effect and high installation stability, thereby ensuring the safety and reliability of the motor during operation.

[0087] Specifically, when a large number of first protrusions 111a are provided in the first flow channel 141, the contact area between the stator core and the housing is larger, resulting in greater flow resistance and lower flow rate of the coolant within the first flow channel 141. This improves the stability and reliability of the stator core installation, but reduces the cooling effect of the coolant on the stator core. Conversely, when a small number of first protrusions 111a are provided in the first flow channel 141, the contact area between the stator core and the housing is smaller, resulting in less flow resistance and higher flow rate of the coolant within the first flow channel 141. This also reduces the stability and reliability of the stator core installation, but improves the cooling effect of the coolant on the stator core. Therefore, by adjusting the number of first protrusions 111a and keeping them within a suitable range, a balance can be achieved between the heat dissipation area of ​​the stator core and the installation effect, enabling the motor to have good operating performance.

[0088] In one possible implementation, the shape of each first protrusion 111a can be a prism, cylinder, semi-cylinder, elliptical cylinder, etc.

[0089] Preferably, each first protrusion 111a is a cuboid structure extending along the axial direction of the stator core, so that the first protrusion 111a is easy to form during the processing, which helps to reduce the processing difficulty of the first protrusion 111a while enabling the first protrusion 111a to provide stable support for the installation of the stator core and guide the flow of coolant.

[0090] In one specific implementation, such as Figure 1 As shown, the stator core includes a body portion 1 and a plurality of isolation portions 13. The plurality of isolation portions 13 are distributed at intervals along the circumference of the stator core on the outer wall of the body portion 1. A first flow channel 141 is formed between adjacent isolation portions 13. Along the radial direction of the stator core, the outer surface of the isolation portion 13 and the outer surface of the first protrusion 111a are located on the same arc.

[0091] In this embodiment, by aligning the outer walls of each isolation portion 13 and the outer walls of each first protrusion 111a on the same arc along the radial direction of the stator core, the contact area between the stator core and the housing can be further increased. When the stator core is installed inside the housing, both the isolation portion 13 and the first protrusion 111a can be interference-fitted with the inner wall of the housing, further improving the stability and reliability of the stator core installation. Furthermore, when their outer surfaces are on the same arc, the isolation portion 13 and the first protrusion 111a can be processed simultaneously during the stator core manufacturing process, simplifying the manufacturing process and improving the production efficiency of the stator core.

[0092] In one specific embodiment, the stator core further includes an end portion 2, which includes a first end portion 21 and a second end portion 22 disposed opposite to each other. Along the axial direction of the stator core, the first end portion 21 and the second end portion 22 are respectively connected to both sides of the body portion 1.

[0093] Part of the isolation section 13 is connected to the first end 21 and forms a second flow channel 142 between it and the second end 22.

[0094] In this embodiment of the application, by providing a first end 21 and a second end 22 on both sides of the body portion 1, the isolation portion 13 can also form a second flow channel 142 extending circumferentially along the stator core between itself and the end 2, so that the two adjacent first flow channels 141 can be connected through the second flow channel 142, thereby enabling the coolant to flow stably and smoothly in the first cooling flow channel 14.

[0095] Along the radial direction of the stator core, the outer surfaces of the first end 21 and the second end 22, the outer surfaces of the isolation portion 13 and the first protrusion 111a are all located on the same arc. This design further increases the contact area between the stator core and the housing. When the stator core is installed in the housing, each isolation portion 13, each first protrusion 111a and the end 2 can be interference-fitted with the inner wall of the housing, thereby further improving the stability and reliability of the stator core installation.

[0096] Meanwhile, since the outer surface of end 2 can be interference-fitted with the inner wall of the shell, the first end 21 and the second end 22 can guide and block the flow of coolant, thus preventing most of the coolant from overflowing during the flow of the second channel 142. This allows most of the coolant to be retained in the first cooling channel 14, ensuring that there is enough coolant in the first cooling channel 14 for heat exchange with the stator core, thereby ensuring the cooling effect of the coolant on the stator core.

[0097] Furthermore, along the circumference of the stator core, one of two adjacent isolation sections 13 is connected to the first end 21, and the other is connected to the second end 22. This design ensures that the projections of the two adjacent isolation sections 13 at least partially overlap, allowing the outer wall of the stator core to have a first cooling channel 14 extending in a serpentine structure. This not only increases the contact area between the coolant and the stator core but also extends the flow path of the coolant on the outer wall of the stator core, enabling the coolant to fully exchange heat with the stator core and remove more heat, thereby improving the cooling effect of the coolant on the stator core.

[0098] In one specific embodiment, both the first end 21 and the second end 22 are provided with a plurality of second cooling channels 23. The plurality of second cooling channels 23 extend along the axial direction of the stator core and are distributed at intervals along the circumferential direction of the stator core. The second cooling channels 23 are connected to the first channel 141 and / or the second channel 142.

[0099] In this embodiment, the stator core is further provided with slots to accommodate the stator windings. When the coolant flows along the first flow channel 141 to its end, and / or as the coolant flows through the second flow channel 142, at least a portion of the coolant can flow out of the first cooling flow channel 14 through the second cooling flow channel 23 at the end 2 and spray onto the stator windings, so that this portion of the coolant can exchange heat with the stator windings, thereby allowing the coolant to carry away the heat from the stator windings and cool them down. Therefore, through this design, the coolant can be diverted during its flow within the first cooling flow channel 14, allowing a portion of the coolant to circulate within the first cooling flow channel 14 to cool the stator core, while another portion of the coolant can be sprayed onto the stator windings through the second cooling flow channel 23 at the end 2 to cool the stator windings, thus ensuring the stability and reliability of the motor during operation.

[0100] In one specific implementation, such as Figure 2 and Figure 4 As shown, the main body 1 includes a first body 11 and two second bodies 12. The two second bodies 12 are distributed on both sides of the first body 11 along the axial direction of the stator core. The outer wall of the first body 11 is provided with a first protrusion 111a. The outer wall of the second body 12 is provided with a plurality of second protrusions 121a. The plurality of second protrusions 121a are distributed at intervals along the circumference of the stator core at the end of the first flow channel 141. Along the axial direction of the stator core, adjacent first protrusions 111a and second protrusions 121a are staggered.

[0101] In this embodiment, when the angle between adjacent first flow channels 141 and second flow channels 142 is a right angle, a large stagnant zone is easily generated in the coolant as it flows through the angle. By providing multiple second protrusions 121a at the end of the first flow channel 141 and staggering the adjacent first protrusions 111a and second protrusions 121a, the flow resistance of the coolant can be reduced. This allows the coolant to flow more closely to the sidewall of the first cooling flow channel 14 as it flows through this area, thereby reducing the possibility of a stagnant zone being generated at the angle between the first flow channel 141 and the second flow channel 142 and improving the flow performance of the coolant in the first cooling flow channel 14.

[0102] By providing multiple second protrusions 121a at the end of the first flow channel 141, the contact area between the coolant and the stator core can be further increased, thereby improving the efficiency of heat exchange between the two and enhancing the cooling effect of the coolant on the stator core.

[0103] Meanwhile, along the radial direction of the stator core, when the outer surface of the second protrusion 121a is located on the same arc as the outer surface of the first protrusion 111a, the outer surface of the isolation portion 13, and the outer surface of the end 2, the contact area between the stator core and the housing can be further increased. When the stator core is installed in the housing, each of the second protrusions 121a, each of the first protrusions 111a, each of the isolation portions 13, and the end 2 can be interference-fitted with the inner wall of the housing, thereby further improving the stability and reliability of the stator core installation.

[0104] In addition, by providing multiple spaced second protrusions 121a at the end of the first flow channel 141, the second protrusions 121a can also divert and guide the flow of coolant.

[0105] Specifically, along the circumference of the stator core, the second cooling channel 23 at the end 2 can be disposed between adjacent second protrusions 121a, between the second protrusions 121a and the isolation portion 13, or on the side of the edge second protrusion 121a near the second channel 142 (i.e., at the end of the second channel 142). By providing multiple spaced second protrusions 121a at the end of the first channel 141, a portion of the coolant can flow into each second cooling channel 23 under the guidance of the second protrusions 121a, while another portion flows into the second channel 142 to continue circulating, thereby simultaneously cooling the stator core and stator windings.

[0106] In one specific implementation, such as Figure 1As shown, each first flow channel 141 also includes a first protrusion region 111 and a second protrusion region 121. The second protrusion region 121 is located at both ends of the first protrusion region 111 along the axial direction of the stator core. A plurality of first protrusions 111a are provided in the first protrusion region 111, and a plurality of second protrusions 121a are provided in the second protrusion region 121.

[0107] Wherein, along the direction from the first protruding region 111 toward the second protruding region 121 located at the first end 21, the number of first protrusions 111a at the end of the first protruding region 111 is N1, and along the direction from the second protruding region 121 at the first end 21 toward the first protruding region 111, the number of second protrusions 121a at the end of the second protruding region 121 is N1-1.

[0108] Meanwhile, along the direction from the first protrusion region 111 toward the second protrusion region 121 located at the second end 22, the number of first protrusions 111a at the end of the first protrusion region 111 is N2, and along the direction from the second protrusion region 121 at the second end 22 toward the first protrusion region 111, the number of second protrusions 121a at the end of the second protrusion region 121 is N2-1.

[0109] Furthermore, N1 and N2 satisfy N1≥2 and N2≥2.

[0110] In this embodiment of the application, along the axial direction of the stator core, in adjacent first protrusion region 111 and second protrusion region 121, the number of second protrusions 121a at the connection point is less than the number of first protrusions 111a, so that the number of protrusions tends to decrease in the direction from the first protrusion region 111 to the second protrusion region 121, thereby reducing the flow resistance of the coolant during the flow process and improving the flow performance of the coolant in the first cooling channel 14.

[0111] For example, in the direction from the first protruding region 111 toward the second protruding region 121 located at the first end 21, when the end of the first protruding region 111 is provided with four first protrusions 111a distributed circumferentially along the stator core, three first sub-channels can be formed between the four first protrusions 111a. In the second protruding region 121 adjacent to the first protruding region 111, that is, in the direction from the second protruding region 121 of the first end 21 toward the first protruding region 111, the end of the second protruding region 121 is provided with at least three second protrusions 121a distributed circumferentially along the stator core, and two first sub-channels can be formed between the three second protrusions 121a. Furthermore, the protrusions in these two adjacent rows are staggered along the axial direction of the stator core. When the coolant flows from the first protrusion region 111 toward the second protrusion region 121, the flow area of ​​the first sub-channel composed of multiple second protrusions 121a is greater than the flow area of ​​the first sub-channel composed of multiple first protrusions 111a, which reduces the flow resistance of the coolant. This allows the coolant to pass stably and smoothly through the angle between the first channel 141 and the second channel 142, thereby optimizing the flow performance of the coolant at this location.

[0112] By setting the number of first protrusions 111a at both ends of the first protrusion area 111 to be greater than or equal to 2, it can be ensured that the number of first protrusions 111a in the first protrusion area 111 is within a suitable range, thereby forming a transformation trend between the first protrusion area 111 and the second protrusion area 121. This improves the flow performance of the coolant while ensuring that the stator core has a large heat dissipation area and a stable installation effect, thus ensuring that the motor has good working performance.

[0113] In one specific implementation, such as Figure 1 , Figure 3 and Figure 5 As shown, the stator core is formed by stacking multiple laminations 3 along its axial direction. The laminations 3 include multiple first laminations 31 and multiple second laminations 32. The multiple first laminations 31 are stacked along the axial direction of the stator core to form a first body 11, and the multiple second laminations 32 are stacked along the axial direction of the stator core to form a second body 12.

[0114] In this embodiment, by stacking multiple first laminations 31 and multiple second laminations 32 to form the body portion 1, the difficulty of machining the first cooling channel 14 on the outer wall of the body portion 1 can be reduced, thereby shortening the stator core production process and better meeting actual production needs. During the stacking of the multiple first laminations 31 and multiple second laminations 32, the body portion 1 with the first cooling channel 141, first protrusion 111a, second cooling channel 142, and second protrusion 121a can be obtained simply by assembling the multiple first laminations 31 and multiple second laminations 32 along the axial direction of the stator core using a staggered assembly method. This method is simple to operate and easy to assemble. Furthermore, this design offers high flexibility; by adjusting the number of first laminations 31 and second laminations 32 and their rotation angle during the stacking process, different outer wall structures of the body portion 1 can be obtained, thereby increasing the diversity of the body portion 1 to meet the needs of different products.

[0115] Along the circumference of the stator core, the outer peripheral wall of each first lamination 31 is provided with multiple spaced first rib structures 311, and the multiple first rib structures 311 are stacked along the axial direction of the stator core to form a first protrusion area 111. The outer peripheral wall of each second lamination 32 is provided with multiple spaced second rib structures 321, and the multiple second rib structures 321 are stacked along the axial direction of the stator core to form a second protrusion area 121.

[0116] Specifically, the first rib structure 311 and the second rib structure 321 can both be formed by stamping or punching, which helps to reduce the processing difficulty and production cost of the first laminate 31 and the second laminate 32.

[0117] Meanwhile, along the axial direction of the stator core, during the stacking of multiple first laminations 31 and multiple second laminations 32, some adjacent first rib structures 311 are staggered by a predetermined angle, and two second rib structures 321 located on both sides of the first body 11 are staggered by a predetermined angle, so that the outer wall of the body part 1 forms a first flow channel 141, a second flow channel 142, multiple first protrusions 111a distributed in a mesh pattern, and multiple second protrusions 121a distributed at intervals, and the adjacent first protrusions 111a, adjacent first protrusions 111a and second protrusions 121a are staggered to reduce the flow resistance of the coolant during the flow process and improve the flow performance of the coolant.

[0118] In addition, during the stacking of multiple first stacked pieces 31 and multiple second stacked pieces 32, the unevenness generated during the processing of the first stacked pieces 31 and the second stacked pieces 32 can be dispersed by staggered stacking, so as to avoid excessive concentration of errors and improve the assembly accuracy of the body part 1.

[0119] In one specific implementation, such as Figure 3As shown, the first rib structure 311 includes a first region 311a and a second region 311b. The first region 311a and the second region 311b are alternately arranged along the circumference of the stator core. The first region 311a and the second region 311b are each provided with a first rib 311c. Multiple first ribs 311c are stacked along the axial direction of the stator core to form each first protrusion 111a.

[0120] In the first region 311a, the number of first ribs 311c is X1, and in the second region 311b, the number of first ribs 311c is X2, and X1 and X2 satisfy X1-X2≥1.

[0121] In this embodiment of the application, along the circumferential direction of the stator core, the first rib structure 311 includes an alternately arranged first region 311a and a second region 311b, and the number of first ribs 311c in the first region 311a and the second region 311b differs by at least 1. Through this design, multiple first ribs 311c can form a network of multiple first protrusions 111a after being stacked in a staggered manner along the axial direction of the stator core.

[0122] Specifically, during the stacking of multiple first laminations 31 along the axial direction of the stator core, after a predetermined number of first laminations 31 are stacked, they need to be rotated by a predetermined angle along the circumference of the stator core. Furthermore, since there is a difference between the number of first ribs 311c in the first region 311a and the number of first ribs 311c in the second region 311b, when the first region 311a of the rotated first lamination 31 is aligned with the second region 311b of the first lamination 31 before rotation, the first ribs 311c in adjacent first regions 311a and second regions 311b can be staggered along the axial direction of the stator core, thereby achieving a mesh-like distribution of multiple first protrusions 111a on the outer wall of the first body 11.

[0123] In other embodiments, the number of first ribs 311c in the first region 311a and the second region 311b can also be equal, as long as the first ribs 311c in the first region 311a and the second region 311b adjacent along the axial direction of the stator core can be staggered.

[0124] Thus, the stacked first body 11 has first protrusions 111a distributed in a mesh pattern, resulting in a larger contact area between the outer wall of the first body 11 and the coolant. This improves the efficiency of heat exchange between the two and enhances the cooling effect of the coolant on the first body 11. Furthermore, the multiple first protrusions 111a can also increase the contact area between the first body 11 and the housing, thereby improving the stability and reliability of the stator core installation.

[0125] In one specific implementation, such as Figure 3As shown, along the circumferential direction of the stator core, there are first grooves 311d between adjacent first protrusions 311c in each region, and multiple first grooves 311d are stacked along the axial direction of the stator core to form a first flow channel 141.

[0126] In this embodiment, during the stacking of multiple first laminations 31 along the axial direction of the stator core, after a predetermined number of first laminations 31 are stacked, they need to be rotated circumferentially by a predetermined angle along the stator core. This allows the first groove 311d of the rotated first laminations 31 to align with the first groove 311d of the first laminations 31 before rotation. The first groove 311d of the rotated first laminations 31 can be the first groove 311d within the first region 311a, and the first groove 311d of the first laminations 31 before rotation can be the first groove 311d within the second region 311b. Thus, while multiple first ribs 311c are staggered and stacked to form a mesh-like distribution of multiple first protrusions 111a, multiple first grooves 311d can still be stacked to form a first flow channel 141 with high flatness. This allows the coolant to flow smoothly and steadily, thereby ensuring that the coolant can produce a good cooling effect on the first body 11.

[0127] In one specific implementation, such as Figure 5 As shown, the second rib structure 321 includes a third region 321a and a fourth region 321b. The third region 321a and the fourth region 321b are alternately arranged along the circumference of the stator core. The third region 321a and the fourth region 321b are each provided with a second rib 321c. Multiple second ribs 321c are stacked along the axial direction of the stator core to form each second protrusion 121a.

[0128] Among them, the number of second ribs 321c in the third region 321a is X3, and the number of second ribs 321c in the fourth region 321b is X4, and X3 and X4 satisfy X3-X4≥1.

[0129] In this embodiment of the application, along the circumferential direction of the stator core, the second rib structure 321 includes an alternately arranged third region 321a and a fourth region 321b, and the number of second ribs 321c in the third region 321a and the fourth region 321b differs by at least 1. With this design, multiple second ribs 321c can be stacked along the axial direction of the stator core to form multiple second protrusions 121a.

[0130] Specifically, during the stacking of multiple second laminations 32 along the axial direction of the stator core, when the number of first protrusions 111a on both sides of the first protrusion region 111 is not equal, the number of second protrusions 121a on both sides of the second protrusion region 121 is also not equal, which means that the two second bodies 12 on both sides of the first body 11 need to be staggered by a preset angle, and thus the number of second ribs 321c in the third region 321a and the fourth region 321b is also not equal.

[0131] Thus, the stacked second body 12 can have second protrusions 121a distributed circumferentially along the stator core, thereby creating a difference between the number of protrusions at the connection between the second protrusion region 121 and the first protrusion region 111, and causing the number of protrusions to decrease in the direction from the first protrusion region 111 toward the second protrusion region 121, thereby reducing the flow resistance of the coolant during flow and improving the flow performance of the coolant in the first cooling channel 14.

[0132] In other embodiments, when the number of first protrusions 111a on both sides of the first protrusion region 111 is equal, the number of second protrusions 121a on both sides of the second protrusion region 121 is also equal, so that the two second bodies 12 on both sides of the first body 11 do not need to be offset by a preset angle, and thus the number of second ribs 321c in the third region 321a and the fourth region 321b is also equal.

[0133] In one specific implementation, such as Figure 5 As shown, along the circumference of the stator core, there is a second groove 321d between adjacent second ribs 321c in each region. Multiple second grooves 321d are stacked along the axial direction of the stator core to form a first flow channel 141. There is a third groove 321e between the third region 321a and the fourth region 321b. Multiple third grooves 321e are stacked along the axial direction of the stator core to form a second flow channel 142.

[0134] In this embodiment, during the stacking of multiple second laminations 32 along the axial direction of the stator core, the second groove 321d of the second lamination 32 that is in contact with the first body 11 needs to be aligned with the first groove 311d of the first lamination 31. This ensures that the first flow channel 141 formed by the stacking of multiple second grooves 321d can communicate with the first flow channel 141 formed by the stacking of multiple first grooves 311d. It also ensures that the second protrusion 121a formed by the stacking of multiple second ribs 321c can be located at the end of the first flow channel 141, thereby reducing the flow resistance of the coolant flowing to the second flow channel 142. At the same time, the second flow channel 142 formed by the stacking of multiple third grooves 321e extends circumferentially along the stator core, and the second flow channel 142 can communicate with the first flow channels 141 at both ends, so that the coolant can flow through the second flow channel 142 during the flow process, thereby improving the cooling effect of the coolant on the second body 12 and achieving heat dissipation for the entire body 1.

[0135] In one specific implementation, such as Figure 3 and Figure 5 As shown, along the circumferential direction of the stator core, the outer peripheral wall of each lamination 3 is also provided with multiple spaced isolation ribs 33. The isolation ribs 33 are respectively located between adjacent first rib structures 311 and adjacent second rib structures 321. Multiple isolation ribs 33 are stacked along the axial direction of the stator core to form each isolation part 13.

[0136] In this process, at least one of the multiple isolation ribs 33 of each lamination 3 is provided with a positioning part 331, and the projections of the positioning parts 331 of some laminations 3 overlap along the axial direction of the stator core.

[0137] In this embodiment of the application, during the stacking of multiple first laminations 31 and multiple second laminations 32 along the axial direction of the stator core, the isolation ribs 33 of adjacent first laminations 31, the isolation ribs 33 of adjacent second laminations 32, and the isolation ribs 33 of adjacent first laminations 31 and second laminations 32 are all aligned, so that multiple isolation ribs 33 can be stacked to form an isolation portion 13, so as to form a first cooling channel 14 extending circumferentially along the stator core on the outer wall of the body portion 1.

[0138] Specifically, the isolation rib 33 also has a first groove 311d between itself and the first rib structure 311, and a second groove 321d between itself and the second rib structure 321, so that after the multiple first laminations 31 and multiple second laminations 32 are stacked along the axial direction of the stator core, the protrusions located at the edge positions of each protrusion structure along the circumference of the stator core can also form a first sub-channel between themselves and their adjacent isolation portion 13.

[0139] Meanwhile, by providing a positioning part 331 on at least one of the multiple isolation ribs 33 on each stack 3, it is beneficial to quickly position the multiple stacks 3 together, so as to improve stacking efficiency and thus improve the production efficiency of the main body 1.

[0140] In one possible implementation, adjacent laminations 3 can be fixedly connected by welding along the axial direction of the stator core, and the isolation ribs 33 of each lamination 3 can serve as welding areas to avoid damage to the first cooling channel 14 during the welding process.

[0141] An embodiment of this application also provides an electric motor, which includes a housing and a stator core. The housing has a receiving cavity, and the side wall of the receiving cavity is provided with a liquid inlet and a liquid outlet. The stator core is installed in the receiving cavity, and the stator core is any of the stator cores described above.

[0142] Along the radial direction of the stator core, at least a portion of the stator core abuts against the inner wall of the receiving cavity, so that the stator core and the inner wall of the receiving cavity form each first flow channel 141 and each second flow channel 142.

[0143] In this embodiment of the application, when the stator core is installed in the receiving cavity of the housing, at least a portion of the stator core abuts against the inner wall of the housing, that is, each of the first protrusions 111a, each of the second protrusions 121a, each of the isolation portions 13 and the end portion 2 can be interference-fitted with the inner wall of the receiving cavity, so that the stator core and the inner wall of the receiving cavity form the first cooling channel 14, while improving the stability and reliability of the overall installation of the stator core.

[0144] During motor operation, the inlet is used to input coolant into the receiving cavity, and the outlet is used to discharge the coolant after heat exchange from the receiving cavity, so as to realize the circulation of coolant and improve the cooling effect on the motor.

[0145] In one possible implementation, there are multiple liquid inlets, which are distributed circumferentially along the stator core so that the coolant can flow into the receiving cavity quickly and into the first cooling channel 14 from multiple directions, which helps to improve the uniformity of coolant distribution in the first cooling channel 14.

[0146] In one possible implementation, there are multiple outlets, and these outlets are spaced apart circumferentially along the stator core so that the coolant that has completed heat exchange can flow out of the containment cavity from multiple directions, thereby reducing the possibility of residual coolant in the containment cavity.

[0147] Specifically, along the radial direction of the stator core, the liquid inlet and liquid outlet are arranged opposite to each other on the housing, and along the height direction of the motor, the liquid inlet is located at the top of the housing and the liquid outlet is located at the bottom of the housing, so that the coolant can flow under the action of gravity.

[0148] More specifically, the coolant can flow into the first cooling channel 14 formed by the stator core and the housing through the inlet at the top of the housing, so that a part of the coolant can flow continuously on the outer wall of the stator core through the first cooling channel 14, and another part of the coolant can be sprayed onto the end face of the stator core and the stator winding through the second cooling channel 23 at the end 2, so that the stator core and the stator winding can be cooled down at the same time, thereby ensuring that the stator core receives a uniform and effective cooling effect. The coolant that has completed heat exchange will flow to the bottom of the housing for convergence and flow out of the receiving cavity through the outlet.

[0149] Therefore, by setting up the first flow channel 141 and the second flow channel 142 that are interconnected, a first cooling flow channel 14 extending in a serpentine structure can be formed on the outer wall of the stator core. This allows the coolant in the flow channel to flow both along the axial direction and the circumferential direction of the stator core, thus giving the coolant a longer flow path and improving the heat exchange effect between the coolant and the outer wall of the stator core.

[0150] Meanwhile, by setting multiple first protrusions 111a and multiple second protrusions 121a in each first cooling channel 14, the contact area between the coolant and the stator core can be further increased, and the possibility of dead water zones appearing in the coolant during the flow process can be reduced, thereby improving the flow performance of the coolant in the first cooling channel 14.

[0151] The above description, based on the embodiments shown in the drawings, details the structure, features, and effects of this application. The above description is only a preferred embodiment of this application, but this application does not limit the scope of implementation to what is shown in the drawings. Any changes made in accordance with the concept of this application, or modifications to equivalent embodiments, that do not exceed the spirit covered by the specification and drawings, should be within the protection scope of this application.

Claims

1. A stator core, characterized in that, The outer wall of the stator core is provided with a plurality of first flow channels and a plurality of second flow channels. The plurality of first flow channels are distributed at intervals along the circumference of the stator core, and adjacent first flow channels are connected through the second flow channels. The stator core is provided with a plurality of first protrusions on its outer wall. The plurality of first protrusions are distributed in a mesh pattern in each of the first flow channels, and adjacent first protrusions are staggered along the axial direction of the stator core.

2. The stator core according to claim 1, characterized in that, The stator core includes a body portion and multiple isolation portions. The multiple isolation portions are distributed circumferentially on the outer wall of the body portion. The first flow channel is formed between adjacent isolation portions. Along the radial direction of the stator core, the outer surface of the isolation portion and the outer surface of the first protrusion are located on the same arc.

3. The stator core according to claim 2, characterized in that, The stator core also includes a first end and a second end disposed opposite to each other along its axial direction, a portion of the isolation portion being connected to the first end and forming a second flow channel between the second end and the second end, and a portion of the isolation portion being connected to the second end and forming a second flow channel between the first end and the second end.

4. The stator core according to claim 3, characterized in that, The main body includes a first body and two second bodies. The two second bodies are distributed on both sides of the first body along the axial direction of the stator core. The outer wall of the first body is provided with a first protrusion, and the outer wall of the second body is provided with a plurality of second protrusions. The plurality of second protrusions are distributed at intervals along the circumference of the stator core at the end of the first flow channel, and along the axial direction of the stator core, adjacent first protrusions and second protrusions are staggered.

5. The stator core according to claim 4, characterized in that, Each of the first flow channels also includes a first protruding region and a second protruding region. The second protruding region is located at both ends of the first protruding region along the axial direction of the stator core. Multiple first protrusions are provided in the first protruding region, and multiple second protrusions are provided in the second protruding region. Along the direction from the first protruding region toward the second protruding region located at the first end, the number of the first protrusions at the end of the first protruding region is N1, and along the direction from the second protruding region at the first end toward the first protruding region, the number of the second protrusions at the end of the second protruding region is N1-1. Along the direction from the first protruding region toward the second protruding region located at the second end, the number of the first protrusions at the end of the first protruding region is N2, and along the direction from the second protruding region at the second end toward the first protruding region, the number of the second protrusions at the end of the second protruding region is N2-1. Among them, N1 and N2 satisfy N1≥2 and N2≥2.

6. The stator core according to claim 5, characterized in that, The stator core includes a plurality of first laminations and a plurality of second laminations. The plurality of first laminations are stacked along the axial direction of the stator core to form a first body, and the plurality of second laminations are stacked along the axial direction of the stator core to form a second body. Along the circumference of the stator core, the outer peripheral wall of each first lamination is provided with a plurality of spaced first rib structures, and the plurality of first rib structures are stacked along the axial direction of the stator core to form a first protruding area. The outer peripheral wall of each second lamination is provided with a plurality of spaced second rib structures, and the plurality of second rib structures are stacked along the axial direction of the stator core to form a second protruding area. Along the axial direction of the stator core, some adjacent first rib structures are staggered by a preset angle, and two second rib structures located on both sides of the first body are staggered by a preset angle.

7. The stator core according to claim 6, characterized in that, The first rib structure includes a first region and a second region, which are alternately arranged along the circumference of the stator core. A first rib is provided in both the first region and the second region, and multiple first ribs are stacked along the axial direction of the stator core to form each first protrusion. Each region also has a first groove between adjacent first protrusions, and multiple first grooves are stacked along the axial direction of the stator core to form the first flow channel; Wherein, the number of the first ribs in the first region is X1, the number of the first ribs in the second region is X2, and X1 and X2 satisfy X1-X2≥1.

8. The stator core according to claim 6, characterized in that, The second rib structure includes a third region and a fourth region, which are alternately arranged along the circumference of the stator core. A second rib is provided in both the third region and the fourth region, and multiple second ribs are stacked along the axial direction of the stator core to form each second protrusion. Each region has a second groove between adjacent second ribs, and multiple second grooves are stacked along the axial direction of the stator core to form the first flow channel. The third region and the fourth region also have a third groove, and multiple third grooves are stacked along the axial direction of the stator core to form the second flow channel. Wherein, the number of the second ribs in the third region is X3, the number of the second ribs in the fourth region is X4, and X3 and X4 satisfy X3-X4≥1.

9. The stator core according to claim 6, characterized in that, Along the circumference of the stator core, the outer peripheral wall of each lamination is also provided with a plurality of spaced isolation ribs. The isolation ribs are respectively located between adjacent first rib structures and adjacent second rib structures. The plurality of isolation ribs are stacked along the axial direction of the stator core to form each isolation part. In this embodiment, at least one of the plurality of isolation ribs of each lamination is provided with a positioning part, and the projections of the positioning parts of some of the laminations overlap along the axial direction of the stator core.

10. An electric motor, characterized in that, The motor includes: The housing has a receiving cavity, and the side wall of the receiving cavity is provided with a liquid inlet and a liquid outlet; A stator core, wherein the stator core is installed in the receiving cavity, and the stator core is the stator core according to any one of claims 1-9; Wherein, along the radial direction of the stator core, at least a portion of the stator core abuts against the inner wall of the receiving cavity, so that the stator core and the inner wall of the receiving cavity form the first flow channel and the second flow channel.

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