Stator core and motor

Abstract

The stator core comprises a plurality of first flow channels and a plurality of second flow channels, the first flow channels extend in the axial direction and are distributed at intervals in the circumferential direction, and the second flow channels extend in the circumferential direction and are distributed at intervals in the axial direction, so that the two ends of each second flow channel are communicated with the two adjacent first flow channels respectively; the adjacent second flow channels are arranged in a staggered mode in the circumferential direction of the stator iron core so that the multiple second flow channels can be distributed on the outer wall of the stator iron core in a net shape. The two second flow channels which are adjacent in the circumferential direction are arranged in a staggered mode, the extending distance of the second flow channels in the extending direction of the second flow channels can be prevented from being too long, and therefore in the circumferential flowing process of cooling liquid, the on-way pressure loss can be reduced, the flowing efficiency can be improved, more cooling liquid can flow to the position far away from the liquid inlet through the second flow channels, and the cooling effect is improved. Therefore, the distribution uniformity of the cooling liquid on the outer wall of the stator core is improved, the cooling effect of the cooling liquid on the stator core is improved, and the flowing of the cooling liquid is more stable.

Description

Technical Field

[0001] This application relates to the field of electrode 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 becoming increasingly stringent. Motors generate a significant amount of heat during operation, necessitating cooling to ensure stable output performance and a long service life. Currently, the main heat in a motor originates from the stator windings and stator core. Coolant drips from the inlet on the housing onto the outer surface of the stator core, then flows through internal channels to cool the stator core and windings. However, during coolant flow, the channels cannot completely cover the outer surface of the stator core, resulting in uneven coolant distribution and localized higher temperatures within the stator core, ultimately leading to poor motor cooling. Utility Model Content

[0003] In view of this, this application provides a stator core and a motor to solve the technical problem of poor cooling effect caused by uneven distribution of coolant in the prior art.

[0004] This application provides a stator core, which includes a plurality of first flow channels and a plurality of second flow channels. The first flow channels extend along the axial direction of the stator core and are staggered along the circumferential direction of the stator core. The two ends of the second flow channels along their extension direction are respectively connected to the adjacent first flow channels. The plurality of second flow channels are distributed in a mesh on the outer wall of the stator core.

[0005] In this embodiment, coolant is circulated in each first flow channel and each second flow channel to exchange heat with the stator core, thereby removing heat from the stator core and reducing its temperature. This helps to cool the motor and ensure its stability and reliability during operation.

[0006] On the outer wall of the stator core, multiple first flow channels are distributed circumferentially along the stator, and each first flow channel extends axially along the stator core to connect the two ends of the stator core, so that the coolant can flow through the first flow channels to the end of the stator core and slide down from the end of the stator core to the end face, thereby reducing the temperature on the end face of the stator core.

[0007] On the outer wall of the stator core, multiple second flow channels are distributed at intervals along the axial direction of the stator, and each second flow channel extends circumferentially along the stator core to connect the first flow channels at both ends of each second flow channel, so that the coolant can flow through each second flow channel to each first flow channel after flowing into the outer wall of the stator core.

[0008] The first and second flow channels are interconnected, forming a mesh-like cooling channel network on the outer wall of the stator core. This provides a large contact area between the coolant and the stator core, improving heat dissipation and overall cooling efficiency. Furthermore, the turbulent flow of the coolant within these channels enhances heat exchange between the coolant and the stator core, further improving the motor's cooling performance.

[0009] Simultaneously, adjacent second flow channels are staggered along the circumference of the stator core. This design avoids excessively long extension distances of the second flow channels, thereby reducing pressure loss along the flow path of the coolant and improving flow efficiency. This allows more coolant to flow through the second flow channels to locations farther from the inlet, further enhancing the uniformity of coolant distribution on the outer wall of the stator core and improving cooling effectiveness. Furthermore, this design ensures smoother coolant flow, reducing the likelihood of eddies and vibrations, thus improving the coolant's dynamic performance and resulting in a more uniform distribution of coolant on the outer wall of the stator core.

[0010] In one possible implementation, the stator core includes a body and a plurality of protrusion structures. The plurality of protrusion structures are distributed circumferentially on the outer wall of the body, and a first flow channel is formed between adjacent protrusion structures. The protrusions of adjacent protrusion structures are staggered and a second flow channel is formed between adjacent protrusions.

[0011] In one possible implementation, the depth of the first flow channel is greater than the depth of the second flow channel.

[0012] In one possible implementation, along the axial direction of the stator core, the length of the bump is L1, the width of the second flow channel is L2, and L1 and L2 satisfy 2×L2≤L1.

[0013] In one possible implementation, the stator core includes a first end and a second end disposed opposite to each other along its axial direction, with a portion of the protrusion structure having a predetermined distance from the first end and a portion of the protrusion structure having a predetermined distance from the second end.

[0014] In one possible implementation, the stator core includes a plurality of laminations stacked along the axial direction of the stator core to form the stator core.

[0015] Along the circumference of the stator core, the outer peripheral wall of each lamination is provided with a plurality of spaced rib structures. Each rib structure includes two spaced first ribs and one second rib, and the second rib is located between the two first ribs.

[0016] There are first grooves between adjacent first ribs and between adjacent first ribs and second ribs. Along the axial direction of the stator core, multiple first ribs are stacked to form the protrusion, multiple second ribs are stacked to form the second flow channel, and multiple first grooves are stacked to form the first flow channel.

[0017] 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.

[0018] 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.

[0019] 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, the protrusions of each protrusion structure are 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 flow channel and the second flow channel, thereby improving the stability and reliability of the stator core installation.

[0020] During motor operation, the inlet is used to input coolant into the housing, and the outlet is used to discharge the coolant after heat exchange, thus achieving coolant circulation and improving the cooling effect on the motor. Furthermore, the inlet and outlet are positioned opposite each other on the housing along the radial direction of the stator core, and along the height direction of the motor, the inlet is located at the top of the housing, and the outlet is located at the bottom of the housing, allowing the coolant to flow under gravity.

[0021] Therefore, by setting up interconnected first and second flow channels to form a mesh-like cooling channel network on the outer wall of the stator core, the coolant can flow both axially and circumferentially along the stator core. This increases the contact area between the coolant and the outer wall of the stator core, thereby improving heat exchange efficiency and the cooling effect on the motor. Simultaneously, by designing adjacent second flow channels with staggered circumferential distribution along the stator core, excessive extension distances along their extension direction are avoided. This reduces pressure loss along the flow path of the coolant during circumferential flow, improving flow efficiency and allowing more coolant to flow through the second flow channels to locations farther from the inlet. This further enhances the uniformity of coolant distribution on the outer wall of the stator core, improving the cooling effect on the motor.

[0022] In one possible implementation, the inner wall of the receiving cavity is provided with a second groove, the second groove extending circumferentially along the stator core, the liquid inlet is provided on the bottom wall of the second groove and along the axial direction of the stator core, and the distance between the center of the liquid inlet and the end faces of both ends of the stator core is equal.

[0023] In one possible implementation, the motor further includes a first spray ring and a second spray ring. Along the axial direction of the stator core, the first spray ring and the second spray ring are distributed on both sides of the stator core and are respectively connected to a first end and a second end of the stator core. Both the first spray ring and the second spray ring are provided with a liquid collection chamber, which is in communication with the first flow channel and at least a portion of the second flow channel.

[0024] In one possible implementation, each spray ring includes a first wall and a second wall connected together. The first wall abuts against the end face of the stator core, and the second wall abuts against the inner wall of the receiving cavity. The first wall, the second wall, the inner wall of the receiving cavity, and the end face of the stator core form the liquid collection cavity.

[0025] Along the circumference of the stator core, each of the first walls is provided with a plurality of spray holes spaced apart. The spray holes are connected to the liquid collection chamber. The motor also includes a stator winding mounted on the stator core. Along the radial direction of the motor, each of the spray holes is aligned with the stator winding.

[0026] 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

[0027] 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.

[0028] Figure 1 This is a schematic diagram of the structure of the stator core provided in this application in one embodiment;

[0029] Figure 2 This is a cross-sectional view of the protrusion structure provided in this application in one embodiment;

[0030] Figure 3 This is a cross-sectional view of the protrusion structure provided in this application in another embodiment;

[0031] Figure 4 This is a schematic diagram of the structure of the laminate provided in this application in one embodiment;

[0032] Figure 5 This is a schematic diagram of the structure of the motor provided in one embodiment of the present application;

[0033] Figure 6 yes Figure 5 A magnified view of a portion of the image;

[0034] Figure 7 yes Figure 5 A sectional view;

[0035] Figure 8 This is a cross-sectional view of the housing provided in this application;

[0036] Figure 9 This is a schematic diagram of the structure of the spray ring provided in this application in one embodiment.

[0037] Explanation of reference numerals in the attached figures:

[0038] 1-Stator core;

[0039] 11-Ontology;

[0040] 111 - First end;

[0041] 112 - Second end;

[0042] 12-Protruding structure;

[0043] 121-Bump;

[0044] 122 - Second flow channel;

[0045] 13-First flow channel;

[0046] 14-Stacked pieces;

[0047] 141-Convex rib structure;

[0048] 141a - First rib;

[0049] 141b - Second rib;

[0050] 141c - First groove;

[0051] 2-Shell;

[0052] 21-Receiving cavity;

[0053] 211 - Protrusion;

[0054] 212 - Second groove;

[0055] 212a - Liquid inlet;

[0056] 213 - Third groove;

[0057] 3-Spray ring;

[0058] 31-First spray ring;

[0059] 32 - Second spray ring;

[0060] 33-First Wall;

[0061] 331 - Spray nozzle;

[0062] 34 - Second Wall;

[0063] 35 - Liquid collection chamber.

[0064] 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

[0065] 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.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] Embodiments of this application provide a stator core for use in a motor, such as... Figure 1 As shown, the stator core 1 includes multiple first flow channels 13 and multiple second flow channels 122. The first flow channels 13 extend along the axial direction of the stator core 1 and along the circumferential direction of the stator core 1. Adjacent second flow channels 122 are staggered and connected to adjacent first flow channels 13 at both ends along their extension direction. The multiple second flow channels 122 are distributed in a mesh pattern on the outer wall of the stator core 1.

[0070] In this embodiment, along the radial direction of the stator core 1, the outer wall of the stator core 1 is provided with a plurality of first flow channels 13 and a plurality of second flow channels 122. Coolant is circulated in each first flow channel 13 and each second flow channel 122. The coolant is used to exchange heat with the stator core 1, thereby removing the heat from the stator core 1 and reducing the temperature of the stator core 1, so as to cool the motor and ensure the stability and reliability of the motor during operation.

[0071] Specifically, on the outer wall of the stator core 1, multiple first flow channels 13 are distributed circumferentially along the stator, and each first flow channel 13 extends axially along the stator core 1 to connect the two ends of the stator core 1. This allows the coolant to flow through the first flow channels 13 to the ends of the stator core 1 and slide down to the end face, thereby reducing the temperature on the end face of the stator core 1. Thus, the coolant can flow through most of the area of ​​the outer wall of the stator core 1, which helps to increase the contact area between the coolant and the outer wall of the stator core 1, thereby improving the cooling efficiency of the stator core 1.

[0072] The stator core 1 is also provided with toothed grooves (not shown in the figure) to accommodate the stator windings (not shown in the figure). When the coolant flows through the first flow channel 13 to the end of the stator core 1, some of the coolant can drip onto the stator windings to facilitate heat exchange between the stator windings. This ensures that the coolant can simultaneously remove heat from both the stator core 1 and the stator windings, which is beneficial for improving the cooling effect on the motor.

[0073] Specifically, on the outer wall of the stator core 1, a plurality of second flow channels 122 are distributed at intervals along the axial direction of the stator, and each second flow channel 122 extends circumferentially along the stator core 1 to connect with the first flow channels 13 at both ends of each second flow channel 122, so that after the coolant flows into the outer wall of the stator core 1, it can flow through each second flow channel 122 to each first flow channel 13, thereby improving the uniformity of coolant distribution on the outer wall of the stator core 1, so that the stator core 1 can receive uniform and effective cooling.

[0074] The first flow channels 13 and the second flow channels 122 are interconnected, forming a mesh-like cooling channel on the outer wall of the stator core 1. This results in a large contact area between the coolant and the outer wall of the stator core 1, which improves the cooling effect and overall heat dissipation efficiency. Furthermore, the turbulent flow of the coolant within the cooling channels enhances the heat exchange efficiency between the coolant and the stator core 1, further improving the motor's heat dissipation performance.

[0075] At the same time, such as Figure 5 and Figure 6 As shown, adjacent second flow channels 122 are staggered along the circumference of the stator core 1. This design avoids excessively long extension distances of the second flow channels 122 along their extension direction, thereby reducing the pressure loss along the flow path of the coolant during the circumferential flow of the coolant along the stator core 1, improving the flow efficiency of the coolant, and allowing more coolant to flow through the second flow channels 122 to a position farther from the inlet 212a. This further improves the uniformity of coolant distribution on the outer wall of the stator core 1, enhancing the cooling effect of the coolant on the stator core 1. Furthermore, this design also makes the coolant flow more smoothly, reducing the possibility of eddies and vibrations during flow, thus improving the dynamic performance of the coolant and resulting in a more uniform distribution of coolant on the outer wall of the stator core 1.

[0076] Furthermore, the first flow channel 13 and the second flow channel 122 can be perpendicular to each other along the circumferential and axial directions of the stator core 1. This allows some of the coolant to flow along the first flow channel 13 to the end of the stator core 1 after flowing out of the second flow channel 122, thereby cooling the end face and stator windings of the stator core 1. The other part of the coolant continues to flow along the second flow channel 122 to cover the outer wall of the stator core 1, thereby cooling the outer wall of the stator core 1. Therefore, when the first flow channel 13 and the second flow channel 122 are perpendicular to each other, it is beneficial to improve the uniformity of coolant distribution while ensuring the flow rate of coolant in each first flow channel 13, so that the coolant can effectively cool the outer wall, end face, and stator windings of the stator core 1 simultaneously.

[0077] In other embodiments, the second flow channel 122 may also be inclined relative to the first flow channel 13 along the axial direction of the stator core 1.

[0078] In one specific implementation, such as Figure 1 As shown, the stator core 1 includes a body 11 and a plurality of protrusions 12. The plurality of protrusions 12 are distributed at intervals along the circumference of the stator core 1 on the outer wall of the body 11. The first flow channel 13 is formed between adjacent protrusions 12, and the protrusions 121 of adjacent protrusions 12 are staggered and the second flow channel 122 is formed between adjacent protrusions 121.

[0079] In this embodiment, the outer wall of the stator core 1 is provided with a plurality of protrusions 12, which are distributed circumferentially along the outer wall of the body 11, and the first flow channel 13 is formed between adjacent protrusions 12. Each protrusion 12 is provided with a plurality of protrusions 121, which are distributed axially along the stator core 1, and the second flow channel 122 is formed between adjacent protrusions 121.

[0080] In this design, the protrusions 121 of adjacent protrusion structures 12 are staggered along the circumference of the stator core 1, so that adjacent second flow channels 122 are also staggered. This ensures that the two ends of any second flow channel 122 in the protrusion structure 12 are aligned with the protrusions 121 of the adjacent protrusion structure 12. This allows the coolant to flow out of the second flow channel 12 and then be diverted by the protrusions 121 of the adjacent protrusion structure 12. Consequently, the coolant can flow through the first flow channel 13 to both ends of the stator core 1, thereby cooling the ends of the stator core 1. Furthermore, this design improves the fluidity of the coolant on the outer wall of the stator core 1, promoting coolant circulation and increasing the cooling efficiency of the stator core 1.

[0081] Specifically, the shape of each protrusion 121 can be prism-shaped, cylindrical, semi-cylindrical, elliptical cylindrical, etc.

[0082] Meanwhile, since the coolant flows on the outer wall of the stator core 1, by providing the protrusion structure 12 and protrusion 121 on the outer wall of the stator core 1, the contact area between the outer wall of the stator core 1 and the coolant can be increased, thereby increasing the overall heat dissipation area of ​​the stator core 1 and thus improving the heat dissipation capacity of the stator core 1.

[0083] In addition, such as Figure 5 and Figure 6 As shown, when the stator core 1 is installed inside the motor housing 2, at least a portion of the stator core 1 abuts against the inner wall of the housing 2, that is, the protrusions 121 of each protrusion structure 12 are interference-fitted with the inner wall of the housing 2, which helps to improve the stability and reliability of the stator core 1 installation.

[0084] In one specific implementation, such as Figure 1 As shown, the depth of the first flow channel 13 is greater than the depth of the second flow channel 122.

[0085] In this embodiment, by setting the depth of the first flow channel 13 to be greater than the depth of the second flow channel 122, the coolant, after flowing out of the second flow channel 122, can preferentially flow along the first flow channel 13 connected to it. This allows the coolant to flow through the first flow channel 13 to the end of the stator core 1, thereby cooling the end face of the stator core 1 and the stator windings. As the flow rate of the coolant in the first flow channel 13 gradually increases, the coolant level in the first flow channel 13 rises, allowing it to flow into the next second flow channel 122, thus realizing the circumferential flow of coolant on the outer wall of the stator core 1.

[0086] In one specific implementation, such as Figure 1 As shown, along the axial direction of the stator core 1, the length of the protrusion 121 is L1, the width of the second flow channel 122 is L2, and L1 and L2 satisfy 2×L2≤L1.

[0087] In this embodiment of the application, along the circumference of the stator core 1, the protrusions 121 of the adjacent protrusion structures 12 are misaligned, which causes the adjacent second flow channels 122 to be misaligned, thereby aligning the two ends of any second flow channel 122 in the protrusion structure 12 with the protrusions 121 of the adjacent protrusion structure 12.

[0088] When the length of the protrusion 121 and the width of the second flow channel 122 satisfy 2×L2≤L1, the coolant, after flowing out of the second flow channel 122, needs to be diverted by the protrusion 121. This diverted coolant then flows along the first flow channel 13 towards both ends of the stator core 1. After the diverted coolant has flowed at least a certain distance, it can flow into the next second flow channel 122. This design avoids the coolant from always flowing along the second flow channel 122 under the influence of gravity, thus ensuring that at least a portion of the coolant can flow along the first flow channel 13 to the ends of the stator core 1 and cool the end face and stator windings of the stator core 1. This also ensures the uniformity of coolant distribution on the outer wall of the stator core 1, thereby achieving an effective cooling effect on the stator core 1.

[0089] In one possible implementation, along the circumference of the stator core 1, the width of the protrusion 121 is L3, and the length of the second flow channel 122 is L4, where L3 and L4 satisfy L3=L4. By setting the dimensions of the protrusion 121 and the second flow channel 122 to be equal along the circumference of the stator core 1, the distance of the second flow channel 122 in this direction can be avoided from being too long. This reduces the pressure loss along the flow path of the coolant during the circumferential flow of the coolant along the stator core 1, improves the flow efficiency of the coolant, and allows more coolant to flow through the second flow channel 122 to a position farther from the inlet 212a, further improving the uniformity of coolant distribution on the outer wall of the stator core 1 and enhancing the cooling effect of the coolant on the stator core 1. Simultaneously, setting their dimensions to be equal in this direction also helps to reduce the machining difficulty of the protrusion 121 and the second flow channel 122, improving the production efficiency of the stator core 1.

[0090] In one specific implementation, such as Figure 1 , Figure 5 and Figure 6 As shown, the stator core 1 includes a first end 111 and a second end 112 arranged opposite to each other along its axial direction. A predetermined distance is between the partial protrusion structure 12 and the first end 111, and a predetermined distance is between the partial protrusion structure 12 and the second end 112.

[0091] In this embodiment of the application, each protrusion structure 12 includes a plurality of protrusions 121 and a plurality of second flow channels 122, and the plurality of protrusions 121 and the plurality of second flow channels 122 are arranged alternately in sequence along the axial direction of the stator core 1.

[0092] Among them, such as Figure 2 and Figure 3 As shown, along the axial direction of the stator core 1, when the second flow channel 122 is located at the end of the protrusion structure 12 near the first end 111, there is a preset distance between the protrusion structure 12 and the first end 111, which is the width dimension of the second flow channel 122 along this direction; similarly, when the second flow channel 122 is located at the end of the protrusion structure 12 near the second end 112, there is a preset distance between the protrusion structure 12 and the second end 112, which is the width dimension of the second flow channel 122 along this direction. Therefore, when the second flow channel 122 is located at the end of the protrusion structure 12, it is equivalent to the end of the protrusion structure 12 having an opening, and since the second flow channel 122 connects to the two adjacent first flow channels 13, the second flow channel 122 and the two first flow channels 13 can merge to form a confluence (such as...). Figure 6(As shown by the arrow in the image), so that the coolant from the two first flow channels 13 merges through the second flow channel 122 and then flows out together, which helps to increase the flow area of ​​the axial flow channel of the stator core 1, thereby allowing more coolant to flow out through the first flow channel 13, so as to improve the cooling effect of the coolant on the end face of the stator core 1 and the stator winding.

[0093] Meanwhile, by setting this confluence port, the flow area of ​​the axial flow channel of the stator core 1 is increased. When the coolant flows out of the flow channel through this confluence port, the coolant has a larger diffusion range, resulting in a larger coverage area of ​​the coolant. This is beneficial to improving the uniformity of coolant distribution on the end face of the stator core 1 and the stator winding, so as to ensure the consistency of temperature at each position, thereby ensuring the stability and reliability of the motor during operation.

[0094] In addition, there are multiple manifolds, which are distributed at intervals along the axial direction of the stator core 1 so that the coolant can uniformly cool the end face of the stator core 1 and the stator winding, thereby further improving the cooling effect.

[0095] In one possible implementation, along the axial direction of the stator core 1, both ends of the protrusion structure 12 can be second flow channels 122, so that both ends of the protrusion structure 12 can merge with two adjacent first flow channels 13 to form a confluence port.

[0096] In another possible implementation, along the axial direction of the stator core 1, both ends of the protrusion structure 12 can be protrusions 121, so that neither end of the protrusion structure 12 can merge with the two adjacent first flow channels 13 to form a confluence port.

[0097] In one specific implementation, such as Figure 1 and Figure 4 As shown, the stator core 1 includes multiple laminations 14, which are stacked along the axial direction of the stator core 1 to form the stator core 1.

[0098] In this embodiment, by stacking multiple laminations 14 to form the stator core 1, the difficulty of machining the first flow channel 13, the protrusion 121, and the second flow channel 122 on the outer wall of the stator core 1 can be reduced, thereby shortening the production process of the stator core 1 and better meeting actual production needs. Simultaneously, during the stacking process, the stator core 1 with the first flow channel 13, the protrusion 121, and the second flow channel 122 can be obtained simply by assembling the multiple laminations 14 along the axial direction of the stator core 1 in a staggered manner, which is simple to operate and easy to assemble. Furthermore, this design offers high flexibility; by adjusting the number of laminations 14 and the rotation angle of the laminations 14 during the stacking process, stator cores 1 with different outer wall structures can be obtained, thereby increasing the diversity of the stator core 1 to meet the needs of different products.

[0099] Specifically, along the circumference of the stator core 1, each lamination 14 has multiple spaced-apart rib structures 141 on its outer peripheral wall. Each rib structure 141 includes two spaced-apart first ribs 141a and one second rib 141b. The second rib 141b is located between the two first ribs 141a, and there are first grooves 141c between adjacent first ribs 141a and between adjacent first ribs 141a and second ribs 141b. The first ribs 141a, second ribs 141b, and first grooves 141c on the lamination 14 can all be formed by stamping or punching. The stator core 1 provided in this application can be formed by stacking the same type of lamination 14, which helps to reduce the processing difficulty and production cost of the lamination 14.

[0100] Specifically, along the axial direction of the stator core 1, multiple first ribs 141a can be stacked to form a protrusion 121, multiple second ribs 141b can be stacked to form a second flow channel 122, and multiple first grooves 141c can be stacked to form a first flow channel 13. During the stacking process, after a preset number of laminations 14 are stacked, they need to be rotated circumferentially by a preset angle along the stator core 1 so that the first ribs 141a of the rotated laminations 14 can be aligned with the second ribs 141b of the unrotated laminations 14. The first ribs 141a and 141b are the first and second ribs 141a and 141b within the same rib structure 141; and the second ribs 141b of the rotated laminations 14 can be aligned with the first ribs 141a of the unrotated laminations 14. 41a and second rib 141b; so that the first rib 141a of the rotated stacked piece 14 can be aligned with the first rib 141a of the stacked piece 14 before rotation, the first rib 141a of the rotated stacked piece 14 and the second rib 141b of the stacked piece 14 before rotation are the first ribs 141a in two adjacent rib structures 141; so that the first groove 141c of the rotated stacked piece 14 can be aligned with the first groove 141c of the stacked piece 14 before rotation, the first groove 141c of the rotated stacked piece 14 and the first groove 141c of the stacked piece 14 before rotation are two adjacent first grooves 141c.

[0101] Thus, the stacked stator core 1 has protrusions 121 and flow channels 122 that are staggered along its circumference, thereby giving the outer wall of the stator core 1 a larger contact area with the coolant to improve heat exchange efficiency. At the same time, by setting the second flow channel 122 that is staggered along the circumference of the stator core 1, the coolant has a smaller friction pressure loss during the flow process, so that the coolant can more easily cover the outer wall of the stator core 1, thereby improving the uniformity of coolant distribution and improving the cooling effect on the stator core 1.

[0102] In addition, since there are first grooves 141c between adjacent first protrusions 141a and between adjacent first protrusions 141a and second protrusions 141b, and the first grooves 141c are always aligned with their adjacent first grooves 141c during the stacking process, the first grooves 141c can play a positioning role during the stacking process, so as to realize the rapid and accurate stacking of multiple stacked pieces 14, thereby improving the stacking efficiency of multiple stacked pieces 14.

[0103] Embodiments of this application also provide a motor, such as Figure 5 and Figure 6 As shown, the motor includes a stator core 1 and a housing 2. The housing 2 has a receiving cavity 21. The side wall of the receiving cavity 21 is provided with a liquid inlet 212a and a liquid outlet (not shown in the figure). The stator core 1 is installed in the receiving cavity 21, and the stator core 1 is any of the stator cores mentioned above. At least a portion of the stator core 1 abuts against the inner wall of the receiving cavity 21 along the radial direction, so that the stator core 1 and the inner wall of the receiving cavity 21 form the first flow channel 13 and the second flow channel 122.

[0104] In this embodiment of the application, when the stator core 1 is installed in the receiving cavity 21 of the housing 2, at least a portion of the stator core 1 abuts against the inner wall of the housing 2, that is, the protrusions 121 of each protrusion structure 12 are interference-fitted with the inner wall of the receiving cavity 21, so that the stator core 1 and the inner wall of the receiving cavity 21 form the first flow channel 13 and the second flow channel 122, thereby improving the stability and reliability of the stator core 1 installation.

[0105] During the operation of the motor, the inlet 212a is used to input coolant into the receiving cavity 21, and the outlet is used to discharge the coolant that has completed heat exchange from the receiving cavity 21, so as to realize the circulation of coolant and improve the cooling effect on the motor.

[0106] In one possible implementation, there are multiple inlets 212a, and the multiple inlets 212a are distributed circumferentially along the stator core 1 so that the coolant can flow into the receiving cavity 21 quickly and flow into each first flow channel 13 and each second flow channel 122 from multiple directions, thereby improving the heat dissipation effect on the stator core 1 while improving the uniformity of coolant distribution.

[0107] In one possible implementation, there are multiple outlets, and the outlets are distributed circumferentially along the stator core 1 so that the coolant that has completed heat exchange can flow out of the receiving cavity 21 from multiple directions, thereby reducing the possibility of residual coolant in the first flow channel 13, the second flow channel 122 and the receiving cavity 21.

[0108] Specifically, along the radial direction of the stator core 1, the liquid inlet 212a and the liquid outlet are arranged opposite to each other on the housing 2, and along the height direction of the motor, the liquid inlet 212a is located at the top of the housing 2 and the liquid outlet is located at the bottom of the housing 2, so that the coolant can flow under the action of gravity.

[0109] More specifically, the coolant can flow into the first flow channel 13 and the second flow channel 122 formed by the stator core 1 and the housing 2 through the inlet 212a at the top of the housing 2. This allows a portion of the coolant to flow through the first flow channel 13 to the end of the stator core 1 and slide down to the end face, thereby reducing the temperature of the end face of the stator core 1 and the stator winding. Another portion of the coolant can flow through the second flow channel 122 to each of the adjacent first flow channels 13, thereby gradually covering the outer surface of the stator core 1 with coolant. This improves the uniformity of coolant distribution on the outer wall of the stator core 1, ensuring that the stator core 1 receives uniform and effective cooling. The coolant that has completed heat exchange flows to the bottom of the housing 2 for convergence and flows out of the receiving cavity 21 through the outlet.

[0110] Therefore, by setting up interconnected first flow channels 13 and second flow channels 122 to form a mesh-like cooling channel on the outer wall of the stator core 1, the coolant can flow both axially and circumferentially along the stator core 1. This helps to increase the contact area between the coolant and the outer wall of the stator core 1, thereby improving heat exchange efficiency and the cooling effect on the motor. Simultaneously, by setting adjacent second flow channels 122 in a staggered circumferential distribution along the stator core 1, the extension distance of the second flow channels 122 along their extension direction can be avoided from being too long. This reduces the pressure loss along the flow path of the coolant during the circumferential flow of the coolant, improves the flow efficiency of the coolant, and allows more coolant to flow through the second flow channels 122 to a position farther from the inlet 212a, further improving the uniformity of coolant distribution on the outer wall of the stator core 1 and enhancing the cooling effect on the motor.

[0111] In one specific implementation, such as Figure 8 As shown, the inner wall of the receiving cavity 21 is provided with a second groove 212. The second groove 212 extends circumferentially along the stator core 1. The liquid inlet 212a is provided on the bottom wall of the second groove 212 and along the axial direction of the stator core 1. The distance between the center of the liquid inlet 212a and the end faces of both ends of the stator core 1 is equal.

[0112] In this embodiment of the application, the inner wall of the receiving cavity 21 is provided with two protrusions 211. The two protrusions 211 are distributed at intervals along the axial direction of the stator core 1 and extend along the circumferential direction of the stator core 1, so that a second groove 212 is formed between the two protrusions 211, and the second groove 212 also extends along the circumferential direction of the stator core 1.

[0113] Along the radial direction of the stator core 1, the protrusion 121 of the stator core 1 abuts against the protrusion 211 of the housing 2. Along the axial direction of the stator core 1, the two protrusions 211 are flush with the end face of the stator core 1 on opposite sides. This allows the protrusion 211 to serve as the mounting reference surface of the stator core 1 for positioning. This ensures that the outer wall of the stator core 1 is interference-fitted with the inner wall of the housing 2, reducing the possibility of relative movement between the stator core 1 and the motor during operation and improving the stability and reliability of the stator core 1 installation.

[0114] Meanwhile, along the radial direction of the stator core 1, the protrusions 121 on the stator core 1 that do not abut against the protrusions 211 can form a cooling channel with a large flow area with the second groove 212, so as to reduce the circumferential flow loss of the coolant and increase the flow rate of the coolant in the circumferential flow of the channel, so as to ensure the cooling effect on the stator core 1.

[0115] Specifically, the inlet 212a is located on the bottom wall of the second groove 212, which helps to increase the flow rate of coolant at the inlet 212a, thereby improving the flow efficiency of coolant.

[0116] In this design, along the axial direction of the stator core 1, the liquid inlet 212a can be positioned at the center of the bottom wall of the second groove 212, such that the distance between the center of the liquid inlet 212a and the end face of the first end 111 is equal to the distance between the center of the liquid inlet 212a and the end face of the second end 112. This design improves the uniformity of coolant distribution, ensuring that the flow rates along the axial direction to the first end 111 and the second end 112 after distribution are close to or even equal. This further enhances the uniformity of coolant distribution on the outer wall of the stator core 1, thereby improving the cooling effect on the stator core 1.

[0117] In one specific implementation, such as Figure 7 and Figure 9 As shown, the motor also includes a first spray ring 31 and a second spray ring 32. Along the axial direction of the stator core 1, the first spray ring 31 and the second spray ring 32 are distributed on both sides of the stator core 1 and are respectively connected to the first end 111 and the second end 112 of the stator core 1. Both the first spray ring 31 and the second spray ring 32 are provided with a liquid collection chamber 35, which is connected to the first flow channel 13 and at least part of the second flow channel 122.

[0118] In this embodiment, the first spray ring 31 and the second spray ring 32 are both installed in the receiving cavity 21 of the housing 2 and are distributed on both sides of the stator core 1 along the axial direction of the stator core 1. Both the first spray ring 31 and the second spray ring 32 have cavities, and both have openings on the side facing the stator core 1.

[0119] Specifically, when the first spray ring 31 abuts against the first end 111 of the stator core 1, a liquid collection cavity 35 can be formed between the first spray ring 31 and the end face of the first end 111. The liquid collection cavity 35 can communicate with the first flow channel 13 connected to the first end 111 and at least part of the second flow channel 122 located at the first end 111, so that the coolant can flow into the liquid collection cavity 35 through each cooling flow channel, thereby cooling the end face of the first end 111 and the stator winding located at the first end 111 through the liquid collection cavity 35.

[0120] Specifically, when the second spray ring 32 abuts against the second end 112 of the stator core 1, a liquid collection cavity 35 can be formed between the second spray ring 32 and the end face of the second end 112. The liquid collection cavity 35 can communicate with the first flow channel 13 connected to the second end 112 and at least a portion of the second flow channel 122 located at the second end 112, so that the coolant can flow into the liquid collection cavity 35 through each cooling flow channel, thereby cooling the end face of the second end 112 and the stator winding located at the second end 112 through the liquid collection cavity 35.

[0121] Meanwhile, when the first spray ring 31 and the second spray ring 32 are provided with spray holes 331, the end face of the stator core 1 and the stator winding can be sprayed through the spray holes 331 to increase the coverage of the coolant, thereby further improving the cooling effect of the coolant on the motor.

[0122] In one specific implementation, such as Figure 7 and Figure 9 As shown, each spray ring 3 includes a first wall 33 and a second wall 34 connected together. The first wall 33 abuts against the end face of the stator core 1, and the second wall 34 abuts against the inner wall of the receiving cavity 21. The first wall 33, the second wall 34, the inner wall of the receiving cavity 21 and the end face of the stator core 1 form a liquid collection cavity 35.

[0123] In this embodiment of the application, the inner wall of the receiving cavity 21 is provided with two third grooves 213. The two third grooves 213 are located on the opposite side of the two protrusions 211 along the axial direction of the stator core 1 and extend along the circumference of the stator core 1.

[0124] During installation, the first wall 33 of each spray ring 3 abuts against the end face of the stator core 1, and the second wall 34 of each spray ring 3 abuts against the bottom wall of the third groove 213, so that the stator core 1, the housing 2 and each spray ring 3 can form a liquid collection cavity 35, and the liquid collection cavity 35 can have a large cavity to accommodate a large amount of coolant, so as to increase the pressure of the coolant when it is sprayed out from the spray hole 331, thereby expanding the spray range of the coolant and improving the cooling effect on the end face of the stator core 1 and the stator winding.

[0125] Specifically, along the circumference of the stator core 1, each spray ring 3 has a plurality of spaced spray holes 331 on its first wall 33. The spray holes 331 are connected to the liquid collection chamber 35. Along the radial direction of the stator core 1, each spray hole 331 is aligned with the stator winding so that the coolant can accurately fall onto the stator winding after being sprayed from each spray hole 331, thereby improving the accuracy of the coolant spray.

[0126] More specifically, the first spray ring 31 and the second spray ring 32 have the same structure, so that the capacity of the liquid collection chamber 35 and the number of spray holes 331 are equal, thereby making the flow rate of coolant to the end of the stator core 1 the same, and the cooling effect on the first end 111, the second end 112, the stator winding located at the first end 111 and the stator winding located at the second end 112 is similar or even the same, so as to ensure the uniformity of motor heat dissipation.

[0127] In one possible implementation, along the axial direction of the stator winding, the width of the third groove 213 is greater than the thickness of the spray ring 3, such that the second wall 34 of each spray ring 3 is at least partially distanced from the edge of the housing 2, so that the liquid outlet can be set on the side of each spray ring 3 away from the stator core 1, so that the coolant that has completed heat exchange can flow out from the edge of the receiving cavity 21.

[0128] In one possible implementation, the spray ring 3 can be integrally formed by stamping or other methods to reduce the processing difficulty and production cost of the spray ring 3 and improve the production efficiency of the spray ring 3.

[0129] 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 stator core includes a plurality of first flow channels and a plurality of second flow channels, wherein the first flow channels extend along the axial direction of the stator core; Along the circumference of the stator core, adjacent second flow channels are staggered, and the two ends of the second flow channels along their extension direction are respectively connected to the adjacent first flow channels. A plurality of second flow channels are distributed in a mesh on the outer wall of the stator core.

2. The stator core according to claim 1, characterized in that, The stator core includes a body and a plurality of protrusion structures. The plurality of protrusion structures are distributed at intervals along the circumference of the stator core on the outer wall of the body. A first flow channel is formed between adjacent protrusion structures, and the protrusions of adjacent protrusion structures are staggered and a second flow channel is formed between adjacent protrusions.

3. The stator core according to claim 1, characterized in that, The depth of the first flow channel is greater than the depth of the second flow channel.

4. The stator core according to claim 2, characterized in that, Along the axial direction of the stator core, the length of the protrusion is L1, the width of the second flow channel is L2, and L1 and L2 satisfy 2×L2≤L1.

5. The stator core according to claim 2, characterized in that, The stator core includes a first end and a second end arranged opposite to each other along its axial direction. A portion of the protruding structure is at a preset distance from the first end, and a portion of the protruding structure is at a preset distance from the second end.

6. The stator core according to claim 2, characterized in that, The stator core includes multiple laminations, which are stacked along the axial direction of the stator core to form the stator core. Along the circumferential direction of the stator core, the outer peripheral wall of each lamination is provided with a plurality of spaced rib structures. Each rib structure includes two spaced first ribs and one second rib, and the second rib is located between the two first ribs. There are first grooves between adjacent first ribs and between adjacent first ribs and second ribs. Along the axial direction of the stator core, multiple first ribs are stacked to form the protrusion, multiple second ribs are stacked to form the second flow channel, and multiple first grooves are stacked to form the first flow channel.

7. 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 1-6; 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.

8. The motor according to claim 7, characterized in that, The inner wall of the receiving cavity is provided with a second groove, which extends circumferentially along the stator core. The liquid inlet is located on the bottom wall of the second groove and along the axial direction of the stator core. The distance between the center of the liquid inlet and the end faces of both ends of the stator core is equal.

9. The motor according to claim 7, characterized in that, The motor further includes a first spray ring and a second spray ring. Along the axial direction of the stator core, the first spray ring and the second spray ring are distributed on both sides of the stator core and are respectively connected to the first end and the second end of the stator core. Both the first spray ring and the second spray ring are provided with a liquid collection chamber, which is connected to the first flow channel and at least part of the second flow channel.

10. The motor according to claim 9, characterized in that, Each spray ring includes a first wall and a second wall connected together. The first wall abuts against the end face of the stator core, and the second wall abuts against the inner wall of the receiving cavity. The first wall, the second wall, the inner wall of the receiving cavity, and the end face of the stator core form the liquid collection cavity. Along the circumference of the stator core, each of the first walls is provided with a plurality of spray holes spaced apart. The spray holes are connected to the liquid collection chamber. The motor also includes a stator winding mounted on the stator core. Along the radial direction of the motor, each of the spray holes is aligned with the stator winding.

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