Stator assembly, electric water pump, thermal management system, and vehicle

Abstract

A stator assembly (100), an electric water pump (200), a thermal management system (300), and a vehicle (1000). The stator assembly (100) comprises: a stator core (10), comprising a plurality of stator tooth parts (11) and an annular stator yoke part (12), one end of each stator tooth part (11) in the radial direction being connected to the stator yoke part (12), and the plurality of stator tooth parts (11) being arranged in the circumferential direction of the stator yoke part (12); and an insulating bracket (20), which wraps the stator core (10) by means of injection molding, the insulating bracket (20) being provided with supporting relief openings (21) and positioning parts (22), and at least one of the stator tooth parts (11) and the stator yoke part (12) being axially opposite to the supporting relief openings (21) and locally exposing the end face of one end of the stator core (10) in the axial direction, the positioning parts (22) being axially opposite to the stator tooth parts (11), the positioning parts (22) and the supporting relief openings (21) being respectively located on two sides of the stator core (10) in the axial direction, and the end face of the radial inner end of each stator tooth part (11) being at least partially exposed from the insulating bracket (20).

Description

Stator components, electronic water pumps, thermal management systems and vehicles

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent applications No. 202410308447.9 and No. 202420565957.X filed by Anqing Welling Auto Parts Co., Ltd., Anhui Welling Auto Parts Co., Ltd. and Guangdong Welling Auto Parts Co., Ltd. on March 18, 2024. The entire contents of the above Chinese patent applications are hereby incorporated into this application by reference. Technical Field

[0003] The present application relates to the technical field of electronic water pumps, and more particularly, to a stator assembly, an electronic water pump, a thermal management system, and a vehicle. Background Art

[0004] Electronic water pumps are widely used due to their high efficiency and precise control. However, the prior art requires two insulating brackets, each of which is molded separately using two injection molds. The two molded brackets are then assembled with the stator core, resulting in a complex assembly process and high installation costs. Summary of the Invention

[0005] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, one object of the present application is to provide a stator assembly that is conducive to simplifying the assembly process and saving installation costs.

[0006] Another object of the present application is to provide an electronic water pump having the above-mentioned stator assembly.

[0007] Another object of the present application is to provide a thermal management system having the above-mentioned electronic water pump.

[0008] Another object of the present application is to provide a vehicle having the above thermal management system.

[0009] According to an embodiment of the present application, the stator assembly includes: a stator core, wherein the stator core includes a plurality of stator teeth and an annular stator yoke, wherein one radial end of the stator teeth is connected to the stator yoke and the plurality of stator teeth are arranged circumferentially along the stator yoke; an insulating bracket, wherein the insulating bracket is an injection-molded body and is injection-molded to wrap the stator core, and the insulating bracket has a support avoidance opening and a positioning portion, at least one of the stator teeth and the stator yoke is axially opposite to the support avoidance opening and partially exposes an axial end face of the stator core, the positioning portion is axially opposite to the stator teeth, and the positioning portion and the support avoidance opening are respectively located on both axial sides of the stator core, and the end face of the radial inner end of the stator teeth is at least partially exposed to the insulating bracket.

[0010] In addition, the stator assembly according to the above embodiment of the present application may also have the following additional technical features:

[0011] According to some embodiments of the present application, the support avoidance opening includes a first support hole and a second support hole, the first support hole is axially opposite to the stator tooth portion, and the second support hole is axially opposite to the stator yoke portion.

[0012] According to some embodiments of the present application, there are multiple first support holes, and at least one of the stator teeth is correspondingly provided with at least one first support hole; and / or at least part of the second support holes is located between two adjacent stator teeth in the circumferential direction.

[0013] According to some embodiments of the present application, the second support hole is an annular hole extending circumferentially along the stator yoke; or, the second support holes are multiple and arranged at intervals along the circumference of the stator yoke, a part of the second support holes is located between two adjacent stator teeth, and another part of the second support holes is located radially outside the stator teeth.

[0014] According to some embodiments of the present application, the positioning portion is a groove or a through hole provided in the insulating bracket.

[0015] According to some embodiments of the present application, the stator tooth portion includes a tooth body and a tooth shoe, the tooth body connects the tooth shoe and the stator yoke portion, at least part of the support avoidance opening is axially opposite to the tooth body, and the end face of at least one axial end of the tooth shoe includes a positioning surface exposed on the insulating bracket.

[0016] According to some embodiments of the present application, the insulating bracket includes a tooth insulation portion and a first baffle insulation portion, the tooth insulation portion wraps the tooth body and is provided with at least part of the support avoidance opening, the first baffle insulation portion is respectively provided on both axial sides of the tooth boot and the first baffle insulation portion is connected to the tooth insulation portion, and the radial inner side surface of the first baffle insulation portion is provided with reinforcing ribs.

[0017] According to some embodiments of the present application, the first baffle insulating portion is provided with a plurality of the reinforcing ribs, and the plurality of the reinforcing ribs are arranged at intervals along the circumference of the tooth shoe.

[0018] According to some embodiments of the present application, the reinforcing rib corresponding to the insulating portion of the first baffle on one side is connected to the end face of one axial end of the tooth boot, and the area on the end face of one axial end of the tooth boot opposite to the two adjacent reinforcing ribs is formed as the positioning surface; wherein the radial inner side of the insulating portion of the first baffle on the other side is provided with a connecting rib, the connecting rib extends continuously along the circumference of the tooth boot and is connected to the end face of the other axial end of the tooth boot, and the reinforcing rib is connected to the connecting rib.

[0019] According to some embodiments of the present application, on the first baffle insulating portion located on an axially different side of the stator core from the support avoidance, a gate portion is provided on the radial inner surface of the circumferential middle portion of at least one of the first baffle insulating portions.

[0020] According to some embodiments of the present application, in the axial direction, the distance between the gate portion and the tooth insulation portion is H1, and the distance between the gate portion and the edge of the first baffle insulation portion away from the tooth insulation portion is H2, and H1 is smaller than H2.

[0021] According to some embodiments of the present application, the wall thickness of the tooth insulation portion located on the axial side of the tooth body is L1, and the wall thickness of the tooth insulation portion located on the circumferential side of the tooth body is L2, and L1 is greater than L2.

[0022] According to some embodiments of the present application, the wall thickness of the portion of the insulating bracket located radially inside the stator yoke is 0.3~1.5mm; and / or, the wall thickness of the portion of the tooth insulation portion located on the circumferential side of the tooth body is 0.3~1.5mm; and / or, the wall thickness of the portion of the insulating bracket located radially outside the tooth boot is 0.3~1.5mm.

[0023] According to some embodiments of the present application, the radial inner end surface of the stator tooth portion includes a first area and a second area, the first area and the second area are arranged axially, the first area is exposed to the insulating support, and the insulating support includes a chamfered portion arranged on the radial inner side of the second area, the chamfered portion protrudes inward, and the thickness of the second area increases axially in the direction away from the first area.

[0024] According to some embodiments of the present application, the insulating bracket includes a peripheral insulating portion extending along the circumference of the stator core, and the peripheral insulating portion is injection-molded around the outer peripheral surface of the stator core.

[0025] According to some embodiments of the present application, the peripheral insulating portion extends continuously along the circumference of the stator core, and the outer peripheral surface of the peripheral insulating portion is provided with a circumferential positioning groove; or, the peripheral insulating portion is provided with a circumferential positioning hole, and the outer peripheral surface of the stator core is provided with a circumferential positioning groove, and the circumferential positioning hole is radially opposite to the circumferential positioning groove and exposes the circumferential positioning groove.

[0026] According to some embodiments of the present application, a recess is provided on the outer peripheral surface of the stator core, and part of the outer peripheral insulation portion is embedded in the recess.

[0027] An electronic water pump according to an embodiment of the present application includes a stator assembly according to an embodiment of the present application.

[0028] A thermal management system according to an embodiment of the present application includes an electronic water pump according to an embodiment of the present application.

[0029] A vehicle according to an embodiment of the present application includes a thermal management system according to an embodiment of the present application.

[0030] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0032] FIG1 is a front view of a stator assembly according to an embodiment of the present application;

[0033] FIG2 is a cross-sectional view of a stator assembly according to a first embodiment of the present application;

[0034] FIG3 is a bottom view of a stator assembly according to a second embodiment of the present application;

[0035] FIG4 is a schematic structural diagram of a stator assembly according to the first embodiment of the present application;

[0036] FIG5 is a bottom view of the stator assembly according to the first embodiment of the present application;

[0037] FIG6 is a top view of a stator assembly according to an embodiment of the present application;

[0038] FIG7 is a cross-sectional view of a partial structure of a stator assembly according to an embodiment of the present application;

[0039] FIG8 is a partial enlarged view of the area circled A in FIG2 ;

[0040] FIG9 is a partial structural cross-sectional view of an electronic water pump according to an embodiment of the present application;

[0041] FIG10 is a schematic structural diagram of a vehicle according to an embodiment of the present application.

[0042] Reference numerals:

[0043] Vehicle 1000; thermal management system 300; electronic water pump 200; stator assembly 100;

[0044] stator core 10; stator tooth 11; tooth body 111; tooth shoe 112; positioning surface 113; first area 114; second area 115; stator yoke 12; circumferential positioning groove 13;

[0045] Insulating bracket 20; support avoidance 21; first supporting hole 211; second supporting hole 212; positioning portion 22; tooth insulating portion 23; first baffle insulating portion 24; reinforcing rib 241; connecting rib 242; gate portion 243; chamfered portion 25; peripheral insulating portion 26; circumferential positioning hole 261; second baffle insulating portion 27; positioning post 28; bracket positioning hole 281; first hole section 282; second hole section 283;

[0046] housing 30 ; first sealing portion 301 ; second sealing portion 302 ; third sealing portion 303 ; and stator winding 40 . Modes for Carrying Out the Invention

[0047] The following describes in detail embodiments of the present application. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and are not to be construed as limiting the present application.

[0048] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0049] In the description of this application, "first feature" and "second feature" may include one or more such features, "plurality" means two or more, the first feature "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them, the first feature being "above", "above" and "above" the second feature includes the first feature being directly above and diagonally above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0050] A stator assembly 100 according to an embodiment of the present application will be described below with reference to the accompanying drawings.

[0051] 1 to 9 , a stator assembly 100 according to an embodiment of the present application may include: a stator core 10 and an insulating bracket 20 .

[0052] Specifically, the stator core 10 includes a plurality of stator teeth 11 and an annular stator yoke 12. One radial end of the stator teeth 11 is connected to the stator yoke 12, and the plurality of stator teeth 11 are arranged circumferentially around the stator yoke 12. The insulating bracket 20 is an injection-molded body and wraps around the stator core 10. The insulating bracket 20 has a support clearance 21 and a positioning portion 22. At least one of the stator teeth 11 and the stator yoke 12 is axially opposed to the support clearance 21, partially exposing an axial end surface of the stator core 10. The positioning portion 22 is axially opposed to the stator teeth 11, and the positioning portion 22 and the support clearance 21 are respectively located on opposite axial sides of the stator core 10. The radially inner end surface of the stator teeth 11 is at least partially exposed to the insulating bracket 20.

[0053] The insulating bracket 20 can insulate the stator core 10 from other components, reducing the current in the stator core 10 and thereby reducing losses in the stator core 10. In some embodiments, the stator assembly 100 further includes a stator winding, which is mounted on the insulating bracket 20. The insulating bracket 20 can insulate the stator core 10 from the stator winding and ensure that the stator winding is stably mounted on the stator core 10, such as being stably wound around the stator teeth 11 of the stator core 10.

[0054] The insulating bracket 20 is injection-molded to wrap the stator core 10 , that is, the insulating bracket 20 can be injection-molded in one step and assembled with the stator core 10 , which is beneficial to simplifying the assembly process, saving installation costs, and making the entire stator assembly 100 structurally stable.

[0055] During the manufacturing process of the stator assembly 100, the stator core 10 can be first placed in an injection mold, and then the insulating bracket 20 is injection-molded. The stator assembly 100 can be obtained by demolding. The entire production process is relatively simple, and multiple injection moldings are not required. The assembly process between the insulating bracket 20 and the stator core 10 is also eliminated, and only one set of injection molds is required, which simplifies the design and process assembly costs of the components and realizes the integral injection molding of the insulating bracket 20 and the stator core 10.

[0056] In some related technologies, the insulating bracket and the stator core are integrally injection molded, and the injection molding positioning is performed by contacting the outer peripheral surface of the stator core with the injection mold. This is easily affected by the dimensional tolerance of the outer peripheral surface of the stator core, making injection molding difficult. The cost of controlling the dimensional accuracy of the stator core is high. For example, the cost of strictly controlling the dimensional accuracy of the outer circle of the stator core is high. For example, in some related technologies, the size of the outer peripheral surface of the stator core is large, making it difficult to place the stator core into the injection mold, increasing the difficulty of injection molding. For example, in some related technologies, the size of the outer peripheral surface of the stator core is small, so that there is a gap between the part of the stator core that should be in contact with the injection mold and the injection mold, and the material required for injection molding enters the gap, which is easy to form flash, affecting the positioning accuracy, and the stator core is easy to shake in the injection mold during injection molding, reducing the injection molding accuracy.

[0057] In the present application, the insulating bracket 20 has a support avoidance opening 21 and a positioning portion 22. At least one of the stator tooth portion 11 and the stator yoke portion 12 is axially opposite to the support avoidance opening 21 and partially exposes the end face of one axial end of the stator core 10. The positioning portion 22 is axially opposite to the stator tooth portion 11, and the positioning portion 22 and the support avoidance opening 21 are respectively located on both axial sides of the stator core 10. The end face of the radial inner end of the stator tooth portion 11 is at least partially exposed to the insulating bracket 20.

[0058] During the injection molding process of the insulating bracket 20, the positioning fixture of the mold can be abutted against the exposed portion of one axial end of the stator core 10 to support and position the stator core 10, and the positioning fixture of the mold can be close to the other axial end of the stator tooth portion 11 to limit the stator tooth portion 11; after the insulating bracket 20 is injection molded and demolded, the positioning fixture is withdrawn to form the support avoidance opening 21 and the positioning portion 22, and the portion of the stator core 10 that cooperates with the stator fixture forming the support avoidance opening 21 is exposed. The stator core 10 is supported by the corresponding area of ​​the support avoidance opening 21, and the stator core 10 is limited by the corresponding area of ​​the positioning portion 22, thereby reducing the possibility of the stator core 10 tilting during the injection molding process, facilitating the fixing of the position of the stator core 10, and improving the reliability of the injection molding.

[0059] By axially arranging at least one of the stator tooth portion 11 and the stator yoke portion 12 relative to the support avoidance opening 21 and partially exposing the end face of one axial end of the stator core 10, the positioning tool is supported in an area corresponding to the support avoidance opening 21 of at least one of the stator tooth portion 11 and the stator yoke portion 12, which can at least reduce the deformation of the stator core 10 caused by the injection molding pressure at the supported portion, reduce the adverse effects on the performance of the stator core 10, and strengthen the protection of the stator core 10 during the injection molding process of the insulating bracket 20.

[0060] During the process of injection molding the insulating bracket 20, radial support and positioning can also be performed through the exposed portion of the radial inner end surface of the stator tooth portion 11, so that the positioning tool of the mold is offset against the exposed portion of the radial inner end surface of the stator tooth portion 11 to fix the radial position of the stator core 10, enhance the positioning effect of the stator core 10, and improve the injection molding accuracy.

[0061] During the entire injection molding process, positioning is not required through the outer circumference of the stator core 10, which can reduce the impact of dimensional tolerances on the outer circumference of the stator core 10 and reduce the injection pressure on the outer circumference of the stator core 10 when injecting the insulating bracket 20, thereby reducing the difficulty of injection molding, improving injection molding accuracy, and reducing the cost required to control the dimensional accuracy of the stator core 10. In addition, the parts where the stator core 10 cooperates with the positioning tooling are located at the axial end and radial inner end of the stator core 10, which is conducive to achieving full coverage of the outer circumference of the stator core 10 through the insulating bracket 20 during injection molding, reducing the splicing gap between the insulating bracket 20 and the housing 30 at the outer circumference of the stator core 10, strengthening the sealing of the stator core 10, and reducing the possibility of external dust, water vapor, etc. contacting the stator core 10, which can reduce the adverse effects of the external environment on the performance of the stator core 10 and strengthen the protection of the stator core 10.

[0062] For example, in some specific embodiments, as shown in Figures 1 and 2, the insulating bracket 20 has a support avoidance opening 21 at the lower end and a positioning portion 22 at the upper end. The support avoidance opening 21 and the positioning portion 22 are opposite to the axial sides of the stator core 10 in the vertical direction. The support avoidance opening 21 partially exposes the lower end surfaces of the stator teeth 11 and the stator yoke 12. When the insulating bracket 20 is injection-molded, the positioning tool axially supports and positions the lower end surfaces of the stator teeth 11 and the stator yoke 12, axially limits the upper side of the stator teeth 11, and radially supports and positions the radial inner side of the stator teeth 11. After the insulating bracket 20 is injection-molded, the support avoidance opening 21 is formed on the lower side of the exposed portion of the stator teeth 11 and the stator yoke 12, and the positioning portion 22 is formed on the upper side of the stator teeth 11. The radial inner end surface of the stator teeth 11 is at least partially exposed. In this application, the description of directions such as up, down, front, back, left, and right is only based on the directions marked in the drawings, and is not a limitation on the installation direction of the stator assembly 100 .

[0063] According to the stator assembly 100 of the embodiment of the present application, the insulating bracket 20 is injection-molded to wrap the stator core 10, which is conducive to the injection-molded connection between the insulating bracket 20 and the stator core 10. The entire production process of the stator assembly 100 is relatively simple. In the process of injection-molding the insulating bracket 20, axial support and positioning are performed through at least one of the stator tooth portion 11 and the stator yoke portion 12 that is axially opposite to the support avoidance opening 21, which can reduce the deformation of the supported area of ​​the stator core 10. Axial limiting is performed on the upper side of the portion of the stator tooth portion 11 that is axially opposite to the positioning portion 22, and radial support and positioning is performed through the exposed portion of the radial inner end face of the stator tooth portion 11, without the need for positioning through the outer peripheral surface of the stator core 10, which is conducive to reducing the difficulty of injection molding and improving the injection molding accuracy.

[0064] In some embodiments of the present application, as shown in FIG3 , the support avoidance opening 21 includes a first support hole 211 and a second support hole 212. The first support hole 211 is axially opposite to the stator tooth portion 11, and the second support hole 212 is axially opposite to the stator yoke portion 12. When the insulating bracket 20 is injection molded, one of the stator tooth portion 11 and the stator yoke portion 12 is supported by a positioning tool while the other is suspended, which easily causes the suspended portion to be deformed by the injection pressure. However, in the present application, the positioning tool of the mold supports the portion of the stator tooth portion 11 opposite to the first support hole 211 and the portion of the stator yoke portion 12 opposite to the second support hole 212. This can reduce the suspended portion of the stator core 10 that is not supported by the positioning tool, which is beneficial to reducing the deformation of the stator tooth portion 11 and the stator yoke portion 12 caused by the injection pressure, and strengthen the protection of the stator core 10 during the injection molding of the insulating bracket 20.

[0065] In some embodiments, as shown in FIG3 , there are multiple first support holes 211, with at least one first support hole 211 corresponding to at least one stator tooth 11. The multiple first support holes 211 can exert a supporting force on the stator tooth 11 to support the stator core 10, facilitating the positioning of the stator core 10 for injection molding of the insulating bracket 20 and improving injection molding accuracy.

[0066] At least one first support hole 211 is correspondingly provided for at least one stator tooth 11, that is, the number of stator teeth 11 correspondingly provided with the first support hole 211 is at least one and is less than or equal to the total number of stator teeth 11, and at the stator teeth 11 correspondingly provided with the first support hole 211, the number of first support holes 211 is one or more.

[0067] While supporting the stator teeth 11 through the first support holes 211, the coverage area of ​​the insulating bracket 20 on the stator core 10 can be adjusted to ensure that the coverage area is not too small, thereby improving the insulation effect of the insulating bracket 20 between the stator core 10 and other components, thereby reducing damage to the stator core 10 and enhancing protection of the stator core 10. Furthermore, by ensuring that the coverage area of ​​the insulating bracket 20 on the stator core 10 is not too large, the area of ​​the direct sealing connection between the stator core 10 and the housing 30 is reduced, thereby reducing the risk of moisture contacting the stator core 10 due to sealing failure of the housing 30.

[0068] In some embodiments, there are multiple first support holes 211 at the stator teeth 11 corresponding to the first support holes 211 , and the multiple first support holes 211 can be arranged radially and circumferentially as long as the installation space allows.

[0069] In some embodiments, the number of first support holes 211 corresponding to the stator teeth 11 provided with the first support holes 211 is one, so that the number of first support holes 211 is not too large, thereby reducing the area of ​​the connection and seal between the stator core 10 and the housing 30, and the number of first support holes 211 is not too small, thereby enhancing the support and positioning function during the injection molding process. For example, in some embodiments, as shown in FIG4 , there are six stator teeth 11, and two, three, or six first support holes 211 may be arranged at intervals along the circumference of the stator core 10.

[0070] In some embodiments where a first support hole 211 is provided corresponding to each stator tooth 11, as shown in Figures 2 and 4-5 , multiple first support holes 211 are evenly spaced along the circumference of the stator core 10. The multiple first support holes 211 evenly spaced along the circumference provide uniform circumferential support for the stator core 10 during the injection molding process, reducing the possibility of stator core 10 deflecting and improving support stability and injection molding accuracy.

[0071] In some embodiments, as shown in FIG3 , at least a portion of the second support holes 212 are circumferentially located between two adjacent stator teeth 11. The second support holes 212 can exert a supporting force on at least the portion of the stator yoke 12 between two adjacent stator teeth 11, thereby reducing the overhanging portion of the stator yoke 12 not supported by the positioning tooling during the injection molding of the insulating bracket 20. This helps reduce deformation of the stator yoke 12 caused by injection molding pressure and enhances protection for the stator core 10.

[0072] The second support hole 212 can be a large exposed area, multiple small exposed areas, or other areas, as long as the injection molding conditions permit. For example, in some embodiments, the second support hole 212 is an annular hole extending circumferentially along the stator yoke 12. This can increase the range of the stator yoke 12 supported by the positioning tool, minimize deformation of the stator yoke 12 during the injection molding of the insulating bracket 20, and provide better protection for the stator core 10.

[0073] In other embodiments, as shown in FIG3 , there are multiple second support holes 212 and they are spaced apart along the circumference of the stator yoke 12. At least part of the second support holes 212 are located between two adjacent stator teeth 11. It is possible to increase the range of the stator yoke 12 supported by the positioning tool during the injection molding of the insulating bracket 20 while satisfying the injection molding conditions, such as avoiding some structural limitations. And when the positioning tool supports the part of the stator tooth 11 corresponding to the first support hole 211, the part of the stator yoke 12 located between the two adjacent stator teeth 11 is prone to deformation, and through the second support holes 212, the deformation of the easily deformed area on the stator yoke 12 can be at least reduced, thereby providing better support for the stator core 10. The multiple second support holes 212 can be circular holes or non-circular holes, and this application does not impose any restrictions on this.

[0074] In some specific embodiments, as shown in FIG3 , a plurality of second support holes 212 are arranged at intervals along the circumference of the stator yoke 12. Some second support holes 212 are located between two adjacent stator teeth 11, while others are located radially outward of the stator teeth 11. When the positioning fixture supports the portion of the stator teeth 11 corresponding to the first support holes 211, the second support holes 212 enable the positioning fixture to simultaneously support the portion of the stator yoke 12 located between two adjacent stator teeth 11 and the portion located radially outward of the stator teeth 11, thereby further reducing deformation of the stator yoke 12 and enhancing support and protection for the stator core 10.

[0075] In some embodiments of the present application, as shown in FIG. 2 and FIG. 6 , the positioning portion 22 is a groove or a through hole provided on the insulating bracket 20 , so that a positioning tool corresponding to the position of the positioning portion 22 can limit the stator core 10 .

[0076] It is worth noting that during the injection molding process, the stator core 10 may move in the axial direction, and due to the influence of the axial dimensional error of the stator core 10, the positioning tooling corresponding to the position of the positioning portion 22 may contact the stator tooth portion 11, so that the positioning portion 22 formed after injection molding is a through hole; the positioning tooling corresponding to the position of the positioning portion 22 may also be spaced a certain distance from the stator tooth portion 11, so that the positioning portion 22 formed after injection molding is a groove.

[0077] In some embodiments, as shown in Figures 2 and 4-6, the first support holes 211 and the positioning portions 22 are arranged in a one-to-one correspondence, so that the support and positioning effects exerted on the stator core 10 by the first support holes 211 and the positioning portions 22 are evenly distributed across the plurality of stator teeth 11, and the stator teeth 11 are subjected to relatively uniform forces on both sides of the axial direction, thereby reducing the possibility of the stator core 10 tilting due to uneven force distribution and improving the reliability of the support and positioning of the stator core 10. For example, in some embodiments, as shown in Figures 2 and 4-6, there are six stator teeth 11, and the upper end surface of each stator tooth 11 is opposite to a positioning portion 22 and the lower end surface is opposite to a first support hole 211, and the positioning portion 22 on each stator tooth 11 is arranged opposite to the first support hole 211 in the vertical direction, so that the stator tooth 11 is simultaneously supported and positioned, and the force exerted on the stator core 10 is evenly distributed.

[0078] In some embodiments of the present application, as shown in Figures 2 and 4-6, the stator tooth portion 11 includes a tooth body 111 and a tooth shoe 112. The tooth body 111 connects the tooth shoe 112 and the stator yoke 12. At least a portion of the support avoidance opening 21 is axially opposed to the tooth body 111. The end surface of at least one axial end of the tooth shoe 112 includes a positioning surface 113 exposed to the insulating bracket 20. During the injection molding process, the stator core 10 is supported and positioned by the exposed portion of the axial end surface of the tooth body 111. At the same time, the stator core 10 can be supported and positioned by the positioning surface 113, making the support more stable.

[0079] In some embodiments, as shown in Figures 2 and 4-6, the insulating bracket 20 includes a tooth insulation portion 23 and a first baffle insulation portion 24, the tooth insulation portion 23 wraps the tooth body 111 and is provided with at least a partial support avoidance opening 21, the first baffle insulation portion 24 is respectively provided on both axial sides of the tooth boot 112 and the first baffle insulation portion 24 is connected to the tooth insulation portion 23, and the radial inner side surface of the first baffle insulation portion 24 is provided with a reinforcing rib 241.

[0080] The tooth insulation part 23 wrapping the tooth body 111 can increase the insulation protection area of ​​the stator core 10. The first baffle insulation part 24 arranged on both axial sides of the tooth shoe 112 can limit the arrangement of the stator winding, reduce the possibility of the stator winding shifting and loosening in the radial direction, and improve the installation reliability.

[0081] In some embodiments, as shown in Figures 2 and 4-6, a second baffle insulating portion 28 is provided on the radial outer side of the tooth insulating portion 23. The second baffle insulating portion 28 can limit the arrangement of the stator winding, reduce the possibility of the stator winding shifting radially outward and loosening, and improve installation reliability.

[0082] The reinforcing ribs 241 can improve the strength of the first baffle insulating portion 24, reduce the possibility of the first baffle insulating portion 24 breaking during and after the injection molding process, and improve the strength of the insulating bracket 20. In some embodiments, as shown in Figures 2 and 4-6, the first baffle insulating portion 24 is provided with a plurality of reinforcing ribs 241. The plurality of reinforcing ribs 241 are arranged at intervals along the circumference of the tooth shoe 112, which helps to improve the strength of the first baffle insulating portion 24 at various locations along the circumference, thereby improving the overall strength of the insulating bracket 20.

[0083] For example, in some embodiments, as shown in FIG4 , there are six stator teeth 11, six upper first baffle insulating portions 24 corresponding to the six stator teeth 11, and three reinforcing ribs 241 are provided in the portion of each upper first baffle insulating portion 24 corresponding to the tooth shoe 112 of the stator tooth 11. Six lower first baffle insulating portions 24 are provided in the portion corresponding to the tooth shoe 112 of the stator tooth 11, resulting in a total of 36 reinforcing ribs in the stator assembly 100. Too few reinforcing ribs 241 will result in poor reinforcement, while too many will increase material costs. Providing 36 reinforcing ribs 241 provides better reinforcement of the first baffle insulating portions 24 and helps control costs.

[0084] In some embodiments, as shown in Figures 2 and 4-6 , in the two first baffle insulating portions 24 on either axial side of the tooth shoe 112, the corresponding reinforcing rib 241 of one of the first baffle insulating portions 24 is connected to the end surface of one axial end of the tooth shoe 112. The area on the end surface of the tooth shoe 112 that faces the two adjacent reinforcing ribs 241 forms a positioning surface 113. The reinforcing rib 241 connects the first baffle insulating portion 24 and the tooth shoe 112, further enhancing the strength of the first baffle insulating portion 24. Furthermore, the positioning surface 113 applies a supporting force to the stator core 10 during the injection molding of the insulating bracket 20, thereby improving injection molding reliability.

[0085] A connecting rib 242 is provided radially inwardly of the first baffle insulating portion 24 on the other side. The connecting rib 242 extends continuously along the circumference of the tooth shoe 112 and is connected to the other axial end surface of the tooth shoe 112. A reinforcing rib 241 is connected to the connecting rib 242. The reinforcing rib 241 connects the first baffle insulating portion 24 and the connecting rib 242, further improving the strength of the first baffle insulating portion 24 on the other side. The connecting rib 242 increases the coverage area of ​​the insulating bracket 20 over the stator core 10, thereby improving the reliability of the connection between the insulating bracket 20 and the stator core 10, and reducing the area of ​​the direct sealing connection between the stator core 10 and the housing 30, thereby improving the sealing performance of the stator core 10.

[0086] For example, in some specific embodiments, as shown in Figures 2 and 4-6, there are six stator teeth 11. The corresponding reinforcing ribs 241 of the lower first baffle insulating portion 24 are connected to the lower end surface of the tooth shoe 112. The area between two adjacent reinforcing ribs 241 on the lower end surface of the tooth shoe 112 forms a positioning surface 113. Four positioning surfaces 113 are formed on the lower end surface of the tooth shoe 112 of each stator tooth 11, that is, the stator assembly 100 has a total of 24 positioning surfaces 113. A connecting rib 242 is provided on the radially inner side of the upper first baffle insulating portion 24. The connecting rib 242 extends continuously along the circumference of the tooth shoe 112 and is connected to the upper end surface of the tooth shoe 112. The corresponding reinforcing ribs 241 of the upper first baffle insulating portion 24 are connected to the connecting rib 242.

[0087] In some embodiments, as shown in Figures 2 and 4-6, the height of the reinforcing rib 241 protruding from the first baffle insulating portion 24 increases axially toward the tooth shoe 112. The first baffle insulating portion 24 is subject to the risk of warping during the injection molding process, and when subjected to external forces such as the stator winding, the first baffle insulating portion 24 is more likely to break at the end near the tooth shoe 112. However, increasing the radially inwardly protruding height of the reinforcing rib 241 axially toward the tooth shoe 112 gradually strengthens the first baffle insulating portion 24 axially toward the tooth shoe 112, reducing the risk of warping and breakage. Furthermore, the radially inwardly protruding height of the reinforcing rib 241 decreases axially away from the tooth shoe 112, saving material and facilitating demolding after injection molding.

[0088] In some embodiments including a first baffle insulating portion 24, as shown in Figure 2, a gate portion 243 is provided on the radially inner surface of at least one first baffle insulating portion 24, located axially on a different side of the stator core 10 from the support relief opening 21. The gate portion 243 is the area on the insulating support 20 corresponding to the mold's gate. Material is introduced into the mold through the gate to form the insulating support 20 through injection molding. After injection molding, the area on the insulating support 20 corresponding to the gate forms the gate portion 243.

[0089] The material is introduced from the gate to injection-mold the insulating bracket 20. The gate portion 243 and the support avoidance port 21 are located on different axial sides of the stator core 10, so that the material flows toward the side of the support avoidance port 21. As a result, during the process of injecting the insulating bracket 20, the injection pressure generated by the material on the stator core 10 is opposite to the direction of the supporting force of the positioning tooling on the stator core 10 at the support avoidance port 21, which is beneficial to resisting the injection pressure and fixing the position of the stator core 10.

[0090] The gate portion 243 is located on the radially inner surface of the circumferential center of the first baffle insulating portion 24, allowing the material introduced through the gate to flow evenly along the circumference and radially outward, thereby improving the uniformity of the injection-molded insulating bracket 20. For example, in some specific embodiments, as shown in FIG2 , the gate portion 243 is located on the radially inner surface of the middle reinforcing rib 241 of the three reinforcing ribs 241 on the first baffle insulating portion 24.

[0091] There can be one or more gates 243. For example, in some specific embodiments, there are six stator teeth 11 and six gates 243. Each stator tooth 11 has a gate 243 on the first baffle insulation portion 24 above the tooth shoe 112. The support avoidance opening 21 is located on the lower side of the stator core 10. The six gates corresponding to the gates 243 allow material to be uniformly introduced into the mold, resulting in higher injection efficiency and a more uniform wall thickness of the injection-molded insulating bracket 20, resulting in better injection quality. The gate 243 is located above the stator tooth 11, allowing the introduced material to flow downward under the action of gravity for injection molding. This results in lower injection pressure and higher injection efficiency compared to upward introduction of material. The introduction of material generates downward injection pressure on the stator core 10, while the positioning fixture at the support avoidance opening 21 applies an upward support force to the stator core 10, facilitating the fixation of the stator core 10 and improving injection efficiency and quality.

[0092] For example, in some embodiments, there are six stator teeth 11 and three gates 243. The three gates 243 are evenly spaced apart along the circumference of the stator core 10, which is beneficial for improving the injection molding uniformity while meeting the injection molding conditions (for example, avoiding areas where gates cannot be arranged due to structural limitations), and the injection molding reliability is better.

[0093] In some embodiments, as shown in FIG2 , in the axial direction, the distance between the gate portion 243 and the tooth insulation portion 23 is H1, and the distance between the gate portion 243 and the edge of the first baffle insulation portion 24 away from the tooth insulation portion 23 is H2, where H1 is smaller than H2. During the injection molding process of the insulating bracket 20, the material introduced from the gate needs to flow to the area in the mold radially outward relative to the first baffle insulation portion 24, such as the area where the tooth insulation portion 23 is located. Making H1 smaller than H2, that is, making the gate corresponding to the gate portion 243 axially close to the area where the tooth insulation portion 23 is located, helps to reduce the flow path of the material to the radially outer area of ​​the mold, reduce flow resistance, and make it easier for the material to flow from the gate portion 243 to the radially outer area, thereby improving the injection molding efficiency and the injection molding accuracy of different areas. In some embodiments including a tooth insulation portion 23, as shown in Figures 2 and 7, the wall thickness of the tooth insulation portion 23 located on the axial side of the tooth body 111 is L1, and the wall thickness of the tooth insulation portion 23 located on the circumferential side of the tooth body 111 is L2, and L1 is greater than L2.

[0094] During the injection molding process, the material temperature is higher than that of the stator core 10. As the material flows over the stator core 10, it absorbs some of the heat, causing the material temperature to drop. This in turn reduces the material's fluidity, making it difficult to fill the injection mold. This can easily lead to material shortages in the insulating bracket 20 and increase the difficulty of injection molding. Increasing the material quantity can slow the material's cooling rate, but this can also increase the wall thickness of the insulating bracket 20, reducing the stator winding installation space, reducing the slot fill rate, and increasing costs.

[0095] By making L1 greater than L2, the present application reduces the difficulty of injection molding, improves the slot fill rate, and reduces costs. Specifically, L1 has a minor impact on the slot fill rate; increasing L1 can reduce the material's cooling rate, enhance its fluidity, and help maintain the required wall thickness of the insulating bracket 20. L2 has a greater impact on the slot fill rate; reducing L2 can increase the installation space for the stator winding, improve the slot fill rate, and reduce costs. While minimizing L2 to increase the slot fill rate, increasing L1 to reduce the material's cooling rate helps achieve the dual requirements of reducing the difficulty of injection molding and improving the slot fill rate.

[0096] In some embodiments, as shown in Figures 2 and 7, the wall thickness of the tooth insulating portion 23 located on the upper and lower sides of the tooth body 111 can be equal or different. The wall thickness of the tooth insulating portion 23 located on both sides of the tooth body 111 can be equal or different, as long as the wall thickness of the tooth insulating portion 23 located on the upper and lower sides of the tooth body 111 is greater than the wall thickness of the portion located on both sides of the tooth body 111.

[0097] In some embodiments including the tooth insulation portion 23, as shown in Figure 7, the wall thickness L5 of the portion of the insulating bracket 20 located radially inward of the stator yoke 12 is 0.3-1.5 mm. A larger L5 may reduce the slot fill rate, while a smaller L5 may increase the difficulty of injection molding. Within this range, L5 helps achieve a balance between the slot fill rate and the difficulty of injection molding. For example, L5 can be 0.3 mm, 0.5 mm, 1 mm, 1.5 mm, etc.

[0098] In some embodiments, as shown in Figure 7 , the wall thickness L2 of the portion of the tooth insulation portion 23 located on one circumferential side of the tooth body 111 is 0.3-1.5 mm. A larger L2 may reduce the slot fill rate, while a smaller L2 may increase the difficulty of injection molding. Keeping L2 within the above range helps achieve a balance between the slot fill rate and the difficulty of injection molding. For example, L2 may be 0.3 mm, 0.5 mm, 1 mm, 1.5 mm, etc.

[0099] In some embodiments, as shown in FIG7 , the wall thickness L6 of the portion of the insulating bracket 20 radially outward from the tooth shoe 112 is 0.3 to 1.5 mm. A value of L6 that is too large can reduce the slot fill rate, while a value that is too small can increase the difficulty of injection molding. L6 within the above range helps achieve a balance between the slot fill rate and the difficulty of injection molding. For example, L6 can be 0.3 mm, 0.5 mm, 1 mm, 1.5 mm, etc.

[0100] In some embodiments, as shown in FIG7 , L5 is 0.3-1.5 mm, L2 is 0.3-1.5 mm, and L6 is 0.3-1.5 mm. L5, L2, and L6 may be equal or unequal.

[0101] In some embodiments of the present application, as shown in Figures 2, 4 and 8, the radial inner end surface of the stator tooth portion 11 includes a first area 114 and a second area 115, the first area 114 and the second area 115 are arranged axially, the first area 114 is exposed to the insulating support 20, and the insulating support 20 includes a chamfered portion 26 arranged on the radial inner side of the second area 115, the chamfered portion 26 protrudes inward, and the thickness of the second area 115 increases along the axial direction away from the first area 114.

[0102] Correspondingly, the portion of the injection mold corresponding to the first region 114 matches the shape of the first region 114. This surface of the injection mold cooperates with the first region 114 to radially support and position the stator core 10. The portion of the injection mold corresponding to the chamfered portion 25 is a tapered surface, and the diameter of the tapered surface increases axially away from the first region 114. As a result, the end opening of the tapered surface away from the first region 114 is larger, making it easier to place the stator core 10 into the injection mold through this end opening before injection molding, facilitating smooth injection molding.

[0103] During injection molding, the material enters between the second region 115 and the tapered surface, forming a chamfered portion 26. After injection molding is complete, the tapered surface facilitates demolding of the insulating bracket 20 and the stator core 10 from the injection mold. For example, in some embodiments, as shown in Figures 4 and 8 , the first region 114 is located below the second region 115, and the chamfered portion 26 protrudes inward, increasing the thickness of the second region 115 from bottom to top.

[0104] In some embodiments, as shown in Figures 2 and 8, the axial dimension of the chamfered portion 26 is smaller than the axial dimension of the first region 114, which facilitates injection molding while not easily affecting the structural function of the stator assembly 100. Burrs, flash and other defects are not easily generated at this location during injection molding, resulting in better injection molding quality.

[0105] In some embodiments including the connecting rib 242 , as shown in FIG, FIG4 and FIG8 , the chamfered portion 26 is connected to the connecting rib 242 , which facilitates injection molding while improving the strength of the chamfered portion 26 to improve the strength of the insulating bracket 20 .

[0106] In some embodiments, as shown in Figures 2, 4 and 8, both circumferential end surfaces of the tooth shoe 112 include a first area 114 and a second area 115. The first area 114 of each end surface is located on the lower side of the second area 115, and the first area 114 is exposed to the insulating bracket 20. The insulating bracket 20 includes a chamfered portion 26 provided on the circumferential outer side of the second area 115. The chamfered portion 26 protrudes outward along the circumferential direction. The thickness of the second area 115 increases from bottom to top, which facilitates the placement of the stator core 10 in the mold and demolding, and is conducive to the smooth progress of the injection molding work.

[0107] In some embodiments of the present application, as shown in Figures 1-2 and 4-6, the insulating bracket 20 includes a peripheral insulating portion 27 extending along the circumference of the stator core 10. The peripheral insulating portion 27 is injection-molded around the outer peripheral surface of the stator core 10 to strengthen the sealing of the stator core 10, thereby reducing the possibility of external dust, water vapor, etc. contacting the stator core 10, reducing the adverse effects of the external environment on the performance of the stator core 10, and strengthening the protection of the stator core 10.

[0108] In some embodiments, the peripheral insulating portion 27 extends continuously along the circumference of the stator core 10, and a circumferential positioning groove 13 is provided on the outer circumference of the peripheral insulating portion 27. The continuously extending peripheral insulating portion 27 can fully enclose the outer circumference of the stator core 10, improving the sealing effect. The circumferential positioning groove 13 can also be used to determine the rotational direction of the stator winding during winding, thereby improving installation reliability.

[0109] In some embodiments, as shown in FIG4 , the peripheral insulating portion 27 is provided with a circumferential positioning hole 271, and the outer peripheral surface of the stator core 10 is provided with a circumferential positioning groove 13. The circumferential positioning hole 271 is radially opposed to the circumferential positioning groove 13 and the circumferential positioning groove 13 is exposed. The circumferential positioning groove 13 can be used to determine the rotational direction of the stator winding during winding, and the circumferential positioning hole 271 exposes the circumferential positioning groove 13, facilitating winding operations through the circumferential positioning groove 13 and providing convenient operation.

[0110] In some embodiments, the circumferential positioning holes 271 and the circumferential positioning grooves 13 can be filled with material during the subsequent injection molding of the housing 30 to fully wrap the outer circumference of the stator core 10 and enhance the sealing effect of the stator core 10 .

[0111] In some embodiments, a recess is provided on the outer peripheral surface of the stator core 10, and part of the outer peripheral insulation portion 27 is embedded in the recess, which is beneficial to increasing the contact area between the insulating bracket 20 and the stator core 10, reducing the possibility of cracking of the joint surface between the insulating bracket 20 and the stator core 10 under harsh working conditions such as thermal shock, and improving the structural strength of the stator assembly 100.

[0112] The stator assembly 100 according to a specific embodiment of the present application is described in detail below with reference to the accompanying drawings. It should be understood that the following description is merely illustrative and should not be construed as limiting the application.

[0113] As shown in Figures 1 to 9, a stator assembly 100 according to a specific embodiment of the present application includes a stator core 10, an insulating bracket 20 and a stator winding 40. The insulating bracket 20 is injection-molded to wrap the stator core 10, and the stator winding 40 is wound around the insulating bracket 20.

[0114] The stator core 10 includes six stator teeth 11 and an annular stator yoke 12. The radially outer ends of the stator teeth 11 are connected to the stator yoke 12, and the six stator teeth 11 are spaced apart circumferentially around the stator yoke 12. The stator teeth 11 include a tooth body 111 and a tooth shoe 112. The tooth body 111 connects the tooth shoe 112 to the stator yoke 12. The lower end surface of the tooth shoe 112 includes a positioning surface 113 exposed to the insulating bracket 20. The radially inner end surface and both circumferential end surfaces of the tooth shoe 112 include a first region 114 and a second region 115. The first region 114 is located below the second region 115. The outer circumference of the stator yoke 12 is provided with a circumferential positioning groove 13.

[0115] The insulating bracket 20 includes six tooth insulation sections 23, twelve first baffle insulation sections 24, a second baffle insulation section 28, an outer peripheral insulation section 27, and multiple chamfered portions 26. The tooth insulation sections 23 wrap around the tooth body 111. A positioning section 22 is provided at the upper end of the tooth insulation section 23, and a support relief opening 21 is provided at the lower end. The first baffle insulation sections 24 are located on the upper and lower sides of the tooth shoe 112. A total of 36 reinforcing ribs 241 extending in the vertical direction are provided on the radially inner side surfaces of the twelve first baffle insulation sections 24.

[0116] A circumferentially extending connecting rib 242 is provided radially inwardly of the upper first baffle insulating portion 24. The connecting rib 242 is connected to the upper end surface of the tooth shoe 112. The 18 reinforcing ribs 241 corresponding to the six upper first baffle insulating portions 24 are connected to the connecting rib 242. The 18 reinforcing ribs 241 corresponding to the six lower first baffle insulating portions 24 are connected to the lower end surface of the tooth shoe 112. The area between the lower end surface of the tooth shoe 112 and two adjacent reinforcing ribs 241 forms a positioning surface 113, forming 24 positioning surfaces 113.

[0117] The second baffle insulating portion 28 is provided at the radially outer end of the tooth insulating portion 23. The peripheral insulating portion 27 extends along the circumference of the stator core 10 to wrap around the outer circumference of the stator core 10. The peripheral insulating portion 27 is provided with a circumferential positioning hole 271, which is radially opposite to the circumferential positioning groove 13. The chamfered portion 26 is provided radially inward of the radially inner second region 115 and circumferentially outward of the second regions 115 at both circumferential ends. The chamfered portion 26 is connected to the connecting rib 242 and wraps around the second region 115.

[0118] During the production of the stator assembly 100, the stator core 10 is first placed in the injection mold. The positioning tool is abutted against the first area 114 of the inner circumference of the tooth shoe 112, and the positioning tool supports the portion of the lower end face of the tooth body 111 opposite to the support avoidance opening 21 and the positioning surface 113, thereby achieving support for the stator core 10. At the same time, the positioning tool supports the portion of the upper end face of the tooth body 111 opposite to the positioning portion 22, thereby radially supporting and positioning the stator core 10, axially supporting and positioning, and axially limiting the stator core 10, fixing the position of the stator core 10, reducing the possibility of the stator core 10 tilting, and reducing the adverse effects of dimensional tolerances on the injection molding process, thereby facilitating smooth injection molding. After the position of the stator core 10 is fixed, the insulating bracket 20 is injection molded. After demolding, the stator winding is wound around the insulating bracket 20 to obtain the stator assembly 100.

[0119] In the stator assembly 100 produced, the insulating bracket 20 wraps the outer surface of the stator yoke 12 except the circumferential positioning groove 13, the outer surface of the tooth body 111 except the positioning portion 22 and the supporting avoidance opening 21 relative area, the upper end face of the tooth shoe 112, the second area 115 of the tooth shoe 112, the lower end face of the tooth shoe 112 except the positioning surface 113, and the radial outer end face of the tooth shoe 112. The parts of the stator core 10 exposed from the insulating bracket 20, such as the circumferential positioning groove 13, the relative area of ​​the positioning portion 22, the relative area of ​​the supporting avoidance opening 21, the first area 114, and the positioning surface 113, can be covered by the casing 30 in subsequent processes to improve the sealing of the stator core 10.

[0120] As shown in Figures 1-2, 4-6, and 10, an electronic water pump 200 according to an embodiment of the present application includes a stator assembly 100 according to an embodiment of the present application. Since the stator assembly 100 according to the embodiment of the present application has the above-mentioned beneficial technical effects, according to the electronic water pump 200 according to the embodiment of the present application, the insulating bracket 20 is injection-molded around the stator core 10, which facilitates the injection molding connection between the insulating bracket 20 and the stator core 10. The entire production process of the stator assembly 100 is relatively simple. In addition, during the injection molding of the insulating bracket 20, axial support and positioning are performed by at least one of the stator teeth 11 and the stator yoke 12 at a portion axially opposite to the support avoidance opening 21, which can reduce the deformation of the supported area of ​​the stator core 10. Axial positioning is performed by the upper side of the portion of the stator teeth 11 axially opposite to the positioning portion 22, and radial support and positioning is performed by the exposed portion of the radially inner end surface of the stator teeth 11, without requiring positioning through the outer circumferential surface of the stator core 10, which helps reduce the difficulty of injection molding and improves injection molding accuracy.

[0121] In some embodiments, the electronic water pump 200 further includes a rotor assembly, a housing 30, a pump cover, and an impeller. The housing 30 is injection-molded around the stator assembly 100, the rotor assembly is mounted within the housing 30, and the pump cover seals one end of the housing 30 (e.g., the upper end of the stator assembly 100 in Figure 2) to define a pump chamber. The impeller is located within the pump chamber and is connected to the rotor assembly. Driven by the rotor assembly, it rotates to drive the fluid.

[0122] In some embodiments, as shown in Figures 6 and 9 , a stator assembly 100 includes a stator core 10, an insulating bracket 20, and a stator winding 40. The insulating bracket 20 includes a bracket body and positioning posts 28 partially embedded in the outer circumference of the bracket body. The positioning posts 28 are three and evenly spaced along the circumference of the bracket body. The bracket body includes a core insulation portion, a first baffle insulation portion 24, and a second baffle insulation portion 27. The core insulation portion covers the stator core 10, and the first baffle insulation portion 24 and the second baffle insulation portion 27 are provided on either side of the core insulation portion in the axial direction.

[0123] The positioning post 28 is connected to the core insulation, with one axial end of the positioning post 28 extending beyond the end surface of the core insulation. The extended portion extends radially outward from and is spaced from the second baffle insulation 27 to form a wiring gap. A bracket positioning hole 281 is provided in the extended portion of the positioning post 27. The bracket positioning hole 281 includes a first hole section 282 with a smaller aperture and a second hole section 283 with a larger aperture. The stator winding 40 is wound around the core insulation and located between the first baffle insulation 24 and the second baffle insulation 27. The lead wires of the stator winding 40 are at least partially located within the wiring gap.

[0124] During the process of injection molding the housing 30, the end opening of the bracket positioning hole 281 can be made downward, and the stator assembly 100 can be placed in the injection mold. The positioning tool of the mold extends into the bracket positioning hole 281, and the positioning tool is supported on the bottom wall surface of the first hole section 282 and contacts and cooperates with the inner circumferential surface of the first hole section 282 to achieve axial, radial and circumferential support and positioning of the stator assembly.

[0125] The housing 30 obtained by injection molding wraps around the stator assembly 100 and seals the stator core 10. The housing 30 includes a first sealing portion 301, a second sealing portion 302, and a third sealing portion 303 connected to each other. The first sealing portion 301 is sealed to the outer circumference of the portion extending beyond the positioning post 28, and a portion of the first sealing portion 301 is located within the wiring gap; the second sealing portion 302 is sealed to the edge of the end opening of the bracket positioning hole 281, that is, it is sealed to the axial end face of the positioning post 28; the third sealing portion 303 is located within the second hole section 283 and is sealed to the inner circumference of the second hole section 283.

[0126] In the above embodiment, the insulating bracket 20 is additionally provided with a positioning post 28, which is used to support and position the stator assembly 100 during the subsequent injection molding process of the housing 30, and the wall surface of the bracket positioning hole 281 does not contact the stator core 10. In this way, after the injection molding is completed, the stator core 10 is not exposed at the positioning position, and the positioning post 28 serves to isolate the external moisture environment from the stator core 10, eliminating the need for a subsequent sealing process. In addition, the insulating bracket 20 can wrap the outer peripheral surface of the stator core 10, and the stator assembly 100 is supported and positioned only by the positioning post 28 during the injection molding process of the housing 30, reducing the exposed area of ​​other areas of the stator core 10, thereby reducing the area of ​​direct contact between the housing 30 and the stator core 10, which is conducive to reducing the risk of the stator core coming into contact with moisture due to failure of the housing 30 seal.

[0127] Furthermore, the connections between the positioning post 28 and the first, second, and third sealing portions 301, 302, and 303 form a U-shaped sealing structure. The exposed joint gap formed between the positioning post 28 and the third sealing portion 303 has a short extension, which helps reduce the risk of seal failure. Furthermore, the U-shaped sealing structure has a curved path. Even if the seal at the joint gap fails, moisture is unlikely to flow through the U-shaped path to the stator core 10 or stator winding 40, further improving the sealing effect.

[0128] As shown in FIG10 , a thermal management system 300 according to an embodiment of the present application includes an electronic water pump 200 according to an embodiment of the present application. Because the electronic water pump 200 according to an embodiment of the present application has the aforementioned beneficial technical effects, the thermal management system 300 according to an embodiment of the present application allows the insulating bracket 20 to be injection-molded around the stator core 10, facilitating the injection-molded connection between the insulating bracket 20 and the stator core 10. The entire production process of the stator assembly 100 is relatively simple. Furthermore, during the injection molding of the insulating bracket 20, axial support and positioning are performed by at least one of the stator teeth 11 and the stator yoke 12 at a portion axially opposite the support relief 21, thereby reducing deformation of the supported area of ​​the stator core 10. Axial positioning is performed by the upper side of a portion of the stator teeth 11 axially opposite the positioning portion 22, and radial support and positioning is performed by the exposed portion of the radially inner end surface of the stator teeth 11, without requiring positioning through the outer circumferential surface of the stator core 10. This reduces the difficulty of injection molding and improves injection molding accuracy.

[0129] In some embodiments, the thermal management system 300 is an important component for regulating the vehicle cabin environment (temperature, humidity, etc.) and the working environment of other components. The thermal management system 300 mainly includes: valves, heat exchangers, compressors and pumps, such as the electronic water pump 200 or other water pumps, and the thermal management system 300 has a circulating refrigerant.

[0130] As shown in FIG10 , a vehicle 1000 according to an embodiment of the present application includes a thermal management system 300 according to an embodiment of the present application. Due to the aforementioned beneficial technical effects of the thermal management system 300 according to the embodiment of the present application, in the vehicle 1000 according to the embodiment of the present application, the insulating bracket 20 is injection-molded around the stator core 10, facilitating the injection-molded connection between the insulating bracket 20 and the stator core 10. The entire production process of the stator assembly 100 is relatively simple. Furthermore, during the injection molding of the insulating bracket 20, axial support and positioning are provided by at least one of the stator teeth 11 and the stator yoke 12, which is axially opposed to the support relief opening 21. This reduces deformation of the supported area of ​​the stator core 10. Axial positioning is provided by the upper side of a portion of the stator teeth 11 axially opposed to the positioning portion 22, and radial support and positioning is provided by the exposed portion of the radially inner end surface of the stator teeth 11, without requiring positioning through the outer circumferential surface of the stator core 10. This reduces the difficulty of injection molding and improves injection molding accuracy.

[0131] Among them, vehicle 1000 can be a new energy vehicle. In some embodiments, the new energy vehicle can be a pure electric vehicle with an electric motor as the main driving force. In other embodiments, the new energy vehicle can also be a hybrid vehicle with an internal combustion engine and an electric motor as the main driving force. Regarding the internal combustion engine and the electric motor mentioned in the above embodiments that provide driving power for the new energy vehicle, the internal combustion engine can use gasoline, diesel, hydrogen, etc. as fuel, and the way to provide electrical energy to the electric motor can use power batteries, hydrogen fuel cells, etc., and there is no special limitation here. It should be noted that this is only an exemplary description of the structure of new energy vehicles, etc., and it does not limit the scope of protection of this application.

[0132] The stator assembly, electronic water pump, thermal management system and other components and operations of the vehicle according to the embodiments of the present application are well known to those skilled in the art and will not be described in detail here.

[0133] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0134] Throughout this specification, reference to terms such as "embodiment," "specific embodiment," and "example" means that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0135] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and intent of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A stator assembly, wherein: include: a stator core, the stator core comprising a plurality of stator teeth and an annular stator yoke, wherein one radial end of the stator teeth is connected to the stator yoke and the plurality of stator teeth are arranged along the circumference of the stator yoke; An insulating bracket, which is an injection-molded body and is injection-molded to wrap the stator core, and has a support avoidance opening and a positioning portion. At least one of the stator tooth portion and the stator yoke portion is axially opposite to the support avoidance opening and partially exposes an axial end face of the stator core. The positioning portion is axially opposite to the stator tooth portion, and the positioning portion and the support avoidance opening are respectively located on both axial sides of the stator core. The end face of the radial inner end of the stator tooth portion is at least partially exposed to the insulating bracket.

2. The stator assembly according to claim 1, wherein: The support avoidance opening includes a first support hole and a second support hole, the first support hole is opposite to the stator tooth portion in the axial direction, and the second support hole is opposite to the stator yoke portion in the axial direction.

3. The stator assembly according to claim 2, wherein: There are a plurality of first supporting holes, and at least one stator tooth portion is correspondingly provided with at least one first supporting hole; and / or, At least part of the second supporting holes is located between two adjacent stator teeth in the circumferential direction.

4. The stator assembly according to claim 2 or 3, wherein: The second supporting hole is an annular hole extending along the circumference of the stator yoke; or, There are multiple second support holes and they are spaced apart along the circumference of the stator yoke. Some of the second support holes are located between two adjacent stator teeth, and another part of the second support holes are located radially outside the stator teeth.

5. The stator assembly according to any one of claims 1 to 4, wherein: The positioning portion is a groove or a through hole provided on the insulating bracket.

6. The stator assembly according to any one of claims 1 to 5, wherein: The stator tooth portion includes a tooth body and a tooth shoe, the tooth body connects the tooth shoe and the stator yoke, at least part of the support avoidance opening is axially opposite to the tooth body, and the end face of at least one axial end of the tooth shoe includes a positioning surface exposed to the insulating bracket.

7. The stator assembly according to claim 6, wherein: The insulating bracket includes a tooth insulation portion and a first baffle insulation portion, the tooth insulation portion wraps the tooth body and is provided with at least part of the support avoidance opening, the first baffle insulation portion is respectively provided on both axial sides of the tooth boot and the first baffle insulation portion is connected to the tooth insulation portion, and the radial inner side surface of the first baffle insulation portion is provided with reinforcing ribs.

8. The stator assembly according to claim 7, wherein: The first baffle insulating portion is provided with a plurality of reinforcing ribs, and the plurality of reinforcing ribs are arranged at intervals along the circumferential direction of the tooth shoe.

9. The stator assembly according to claim 7 or 8, wherein: On one side, the reinforcing rib corresponding to the insulating part of the first baffle is connected to the end face of one axial end of the tooth boot, and the area on the end face of one axial end of the tooth boot opposite to the two adjacent reinforcing ribs forms the positioning surface; on the other side, the radial inner side of the insulating part of the first baffle is provided with a connecting rib, the connecting rib extends continuously along the circumference of the tooth boot and is connected to the end face of the other axial end of the tooth boot, and the reinforcing rib is connected to the connecting rib.

10. The stator assembly according to any one of claims 7 to 9, wherein: On the first baffle insulating portion located on a different axial side of the stator core from the support avoidance opening, a gate portion is provided on a radial inner surface of a circumferential middle portion of at least one of the first baffle insulating portions.

11. The stator assembly according to claim 10, wherein: In the axial direction, the distance between the gate portion and the tooth insulating portion is H1, and the distance between the gate portion and an edge of the first baffle insulating portion away from the tooth insulating portion is H2, where H1 is smaller than H2.

12. The stator assembly according to any one of claims 6 to 11, wherein: The wall thickness of the tooth insulating portion located on one side of the tooth body in the axial direction is L1, and the wall thickness of the tooth insulating portion located on one side of the tooth body in the circumferential direction is L2, and L1 is greater than L2.

13. The stator assembly according to any one of claims 6 to 12, wherein: The wall thickness of the portion of the insulating bracket located radially inward of the stator yoke is 0.3-1.5 mm; and / or, The wall thickness of the tooth insulation portion located on one side of the tooth body in the circumferential direction is 0.3-1.5 mm; and / or, The wall thickness of the portion of the insulating bracket located radially outside the tooth shoe is 0.3-1.5 mm.

14. The stator assembly according to any one of claims 1 to 13, wherein: The radial inner end surface of the stator tooth portion includes a first area and a second area, the first area and the second area are arranged axially, the first area is exposed to the insulating bracket, and the insulating bracket includes a chamfered portion arranged on the radial inner side of the second area, the chamfered portion protrudes inward, and the thickness of the second area increases axially in the direction away from the first area.

15. The stator assembly according to any one of claims 1 to 14, wherein: The insulating bracket includes an outer peripheral insulating portion extending along the circumferential direction of the stator core, and the outer peripheral insulating portion is injection-molded to wrap the outer peripheral surface of the stator core.

16. The stator assembly according to claim 15, wherein: The outer peripheral insulating portion extends continuously along the circumference of the stator core, and the outer peripheral surface of the outer peripheral insulating portion is provided with a circumferential positioning groove; or, The outer peripheral insulating portion is provided with a circumferential positioning hole, and the outer peripheral surface of the stator core is provided with a circumferential positioning groove. The circumferential positioning hole is radially opposite to the circumferential positioning groove and the circumferential positioning groove is exposed.

17. The stator assembly according to claim 15 or 16, wherein: A recess is provided on the outer peripheral surface of the stator core, and a portion of the outer peripheral insulating portion is embedded in the recess.

18. An electronic water pump, wherein: Comprising a stator assembly according to any one of claims 1-17.

19. A thermal management system, wherein: Comprising the electronic water pump according to claim 18.

20. A vehicle, wherein Comprising the thermal management system of claim 19.

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