Stator assembly and motor

Abstract

The stator assembly comprises a stator, a shell and a busbar, the shell comprises a shell body and a sealing end cover, a containing cavity with one open end is formed in the shell body, the containing cavity is used for installing the stator and suitable for containing a cooling medium, and the sealing end cover is arranged at the open end of the containing cavity to seal the open end. At least part of the busbar is arranged in the sealing end cover and is suitable for forming a first sub-part in the circumferential direction of the sealing end cover, the first sub-part is used for being electrically connected with a stator winding of a stator, the busbar forms a second sub-part in the sealing end cover, and the second sub-part is used for being electrically connected with the busbar; the busbar and the sealing end cover are integrally formed in an injection molding mode. The busbar and the sealing end cover are subjected to integral injection molding, so that the assembling steps of the stator assembly are simplified, the production efficiency of the stator assembly is improved, and a connecting gap is effectively prevented from being formed between the busbar and the sealing end cover, thereby effectively reducing the risk that a cooling medium leaks through the connecting gap between the busbar and the sealing end cover.

Description

Technical Field

[0001] This invention relates to the field of motor technology, and more particularly to a stator assembly and a motor. Background Technology

[0002] To reduce the risk of motor overheating, the motor stator is usually immersed in coolant to improve the motor's cooling effect.

[0003] In related technologies, a sealing ring or sealant is used to seal between the busbar and the submersible housing. This type of structure has poor assembly convenience, and gaps are easily generated between the two due to processing errors or insufficient assembly precision. Furthermore, during motor operation, the gaps will further crack due to motor vibration, resulting in a high risk of cooling medium leakage. Summary of the Invention

[0004] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, the present invention proposes a stator assembly that can effectively reduce the risk of cooling medium leakage and is easy to assemble.

[0005] A stator assembly according to an embodiment of the present invention includes: a stator; a housing, the housing including: a housing body having an open-ended receiving cavity formed therein, the receiving cavity being used to mount the stator and adapted to contain a cooling medium; a sealing end cap disposed at the open end of the receiving cavity to close the open end; a busbar, at least a portion of the busbar being disposed within the sealing end cap and adapted to have a first sub-part formed circumferentially in the sealing end cap, the first sub-part being used for electrical connection with the stator winding of the stator, and the busbar having a second sub-part formed within the sealing end cap, the second sub-part being used for electrical connection of the busbar; wherein the busbar and the sealing end cap are integrally injection molded.

[0006] According to the stator assembly of the present invention, by integrally injection molding the busbar and the sealing end cap, the assembly steps of the stator assembly can be simplified and the production efficiency of the stator assembly can be improved. It can also effectively prevent the formation of a connection gap between the busbar and the sealing end cap, thereby effectively reducing the risk of leakage of the cooling medium through the connection gap between the two, improving the reliability of the cooling medium for heat dissipation of the stator, and effectively reducing the risk of mutual interference between the busbar and the housing during assembly, thus ensuring the ease of assembly of the stator assembly.

[0007] According to some embodiments of the present invention, the sealing end cap has a connecting portion formed at one axial end opposite to the receiving cavity, the connecting portion being open to the side opposite to the receiving cavity and adapted to expose at least a portion of the second sub-part.

[0008] According to some embodiments of the present invention, the connecting portion is formed with an internal thread, and the stator assembly further includes a threaded connector that engages with the internal thread and is electrically connected to the second sub-part.

[0009] According to some embodiments of the present invention, a portion of the busbar extends from the peripheral wall of the sealed end cap and forms the first sub-section, the first sub-section being adapted to be connected to the stator winding.

[0010] According to some embodiments of the present invention, an annular receiving cavity is formed inside the housing body, and the outer sidewall of the housing body protrudes from the inner sidewall of the housing body in an axial direction parallel to the stator assembly; the sealing end cap includes a first part and a second part connected together, the radially outer end of the first part protruding from the second part, the first part being adapted to seal with the outer sidewall of the housing body, and the second part being adapted to seal with the inner sidewall of the housing body.

[0011] According to some embodiments of the present invention, a portion of the busbar extends from the peripheral wall of the sealing end cap and forms the first sub-part, and the first sub-part is spaced apart from the first portion in an axial direction parallel to the stator assembly.

[0012] According to some embodiments of the present invention, the stator assembly further includes: a flat wire winding terminal, one end of which is connected to the stator winding, and the other end of which abuts against and is connected to the first sub-part.

[0013] According to some embodiments of the present invention, a sealing element is provided on the side of the sealing end cap facing the shell body, the sealing element being used to seal the sealing end cap to the shell body.

[0014] According to some embodiments of the present invention, the sealing end cap has a mounting groove on the side facing the shell body, the mounting groove being used to mount the sealing element.

[0015] The second objective of this invention is to provide an electric motor.

[0016] The motor according to an embodiment of the present invention includes the stator assembly described above.

[0017] The motor has the same advantages as the stator assembly described above, which will not be repeated here.

[0018] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0019] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a partial structural diagram of the stator assembly connected to the inverter according to some embodiments of the present invention. Figure 1 The shell body is a partial structural diagram; Figure 2 This is a partial structural diagram of the stator assembly connected to the inverter according to some embodiments of the present invention. Figure 2 The shell body is a partial structural diagram; Figure 3 This is an assembly diagram of a sealing end cap, busbar, inverter, and stator provided in some embodiments of the present invention; Figure 4 This is a partial cross-sectional view of the stator assembly connected to the inverter according to some embodiments of the present invention; Figure 5 This is a schematic diagram of the structure of the busbar and sealing end cap provided in some embodiments of the present invention.

[0020] Figure label: Stator assembly 100 Stator 110, stator core 111, stator winding 112 Shell 120, Shell body 121, Sealing end cap 122, connecting part 1221, first part 1222, second part 1223, sealing groove 1224. Busbar 130, Sub-section 131 Threaded connector 140, flat wire winding terminal 150, bend 151 Seal 160 Inverter 200. Detailed Implementation

[0021] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0022] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more. In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0023] The following is combined with Figures 1 to 5 A stator assembly 100 according to an embodiment of the present invention is described.

[0024] Combination Figure 1 , Figure 3 and Figure 4 According to an embodiment of the present invention, a stator assembly 100 includes a stator 110 and a housing 120. The housing 120 includes a housing body 121 and a sealing end cap 122. A receiving cavity with one open end is formed in the housing body 121. The receiving cavity is used to install the stator 110. The stator 110 can be installed into the receiving cavity through the open end of the receiving cavity and is adapted to contain a cooling medium. The cooling medium can exchange heat with the stator 110 to absorb the heat generated by the stator 110, reduce the risk of overheating of the stator 110, and thus help to improve the service life of the stator 110.

[0025] The sealing end cap 122 is located at the open end of the receiving cavity to close the open end. This not only effectively reduces the risk of leakage of the cooling medium, but also allows the housing 120 to form a tight protection for the stator 110, reducing the risk of damage to the stator 110 due to mechanical collision. It also helps to prevent the stator 110 from being worn due to contact with dust and other impurities, which is conducive to further improving the service life of the stator 110.

[0026] Furthermore, the stator assembly 100 also includes a busbar 130, at least a portion of which is disposed within a sealing end cap 122 and adapted to have a first sub-part 131 formed circumferentially on the sealing end cap 122. The first sub-part 131 is used for electrical connection with the stator winding 112 of the stator 110, and the busbar 130 has a second sub-part formed within the sealing end cap 122 for electrical connection of the busbar 130. Specifically, the stator 110 includes a stator core 111 and a stator winding 112, the stator winding 112 extending from the axial end of the stator core 111 and electrically connected to the first sub-part 131, and the second sub-part for electrical connection of the busbar 130 with external components (e.g., inverter 200) so that the external components and the stator winding 112 can be electrically connected through the busbar 130.

[0027] Among them, further integration Figure 4 The busbar 130 and the sealing end cap 122 are integrally injection molded. Firstly, this can effectively reduce the risk of connection gaps between the busbar 130 and the sealing end cap 122 due to processing errors or insufficient assembly precision, thereby reducing the risk of leakage of cooling medium through the connection gap between the busbar 130 and the sealing end cap 122. Secondly, it can effectively simplify the assembly process of the stator assembly 100 and improve the production and assembly efficiency of the stator assembly 100. Thirdly, it can effectively reduce the risk of mutual interference between the busbar 130 and the housing 120 during assembly, ensuring the ease of assembly of the stator assembly 100.

[0028] In related technologies, in the structure of the stator of an immersion-cooled motor, the busbar and the immersion housing are formed as separate parts, and a sealing ring or sealant is set between them for sealing. This structural form has poor assembly convenience, and the connection gap between the two is prone to occur due to processing errors or insufficient assembly precision. Furthermore, during motor operation, the connection gap will further crack with motor vibration, resulting in a high risk of cooling medium leakage.

[0029] This application, by integrally injection molding the busbar 130 and the sealing end cap 122, not only simplifies the assembly steps of the stator assembly 100 and improves the production efficiency of the stator assembly 100, but also effectively prevents the formation of a connection gap between the busbar 130 and the sealing end cap 122. This effectively reduces the risk of leakage of the cooling medium through the connection gap between the two, improves the reliability of the cooling medium in heat dissipation of the stator 110, and effectively reduces the risk of mutual interference between the busbar 130 and the housing 120 during assembly, ensuring the ease of assembly of the stator assembly 100.

[0030] Combination Figure 1 and Figure 5In some embodiments of the present invention, the sealing end cap 122 has a connecting portion 1221 formed at one axial end away from the receiving cavity. The connecting portion 1221 is open to the side away from the receiving cavity and is adapted to expose at least a portion of the second sub-part. That is, the second sub-part formed in the sealing end cap 122 of the busbar 130 can be partially or fully exposed through the connecting portion 1221, so as to facilitate the electrical connection of external components (e.g., inverter 200) with the busbar 130, thereby facilitating the connection of external components with the stator winding 112 through the busbar 130.

[0031] Since the busbar 130 and the sealing end cap 122 are integrally injection molded, even if the connecting part 1221 exposes the second sub-part, the sealing between the busbar 130 and the sealing end cap 122 can still be guaranteed. This effectively prevents the cooling medium from leaking through the gap between the busbar 130 and the sealing end cap 122, thereby ensuring the reliability of the cooling medium in dissipating heat from the stator 110. At the same time, there is no need to set additional sealing rings or sealants for sealing the busbar 130 and the sealing end cap 122, which helps to simplify the structure of the stator assembly 100, thereby further simplifying the production and assembly process of the stator assembly 100 and improving its production efficiency.

[0032] Combination Figure 1 and Figure 3 In some embodiments of the present invention, the connecting portion 1221 is formed with an internal thread, and the stator assembly 100 further includes a threaded connector 140, which engages with the internal thread and is electrically connected to the second sub-part.

[0033] For example, the connecting part 1221 can be configured as a mating flange. The external component can be positioned with the sealing end cover 122 through the connecting part 1221, and further cooperate with the connecting part 1221 through the threaded connector 140, so that the external component can be positioned and connected with the sealing end cover 122, and can also be electrically connected with the second sub-part through the threaded connector 140, thereby improving the connection reliability between the external component and the stator assembly 100.

[0034] Combination Figure 3 and Figure 5 In some embodiments of the present invention, a portion of the busbar 130 extends through the peripheral wall of the sealing end cover 122 to form a first sub-part 131. The first sub-part 131 is adapted to be connected to the stator winding 112. By allowing a portion of the busbar 130 to extend through the peripheral wall of the sealing end cover 122 to form the first sub-part 131, it is beneficial to improve the connection convenience between the busbar 130 and the stator winding 112, and to avoid the busbar 130 being unable to be connected to the stator winding 112 due to the sealing end cover 122 completely covering the busbar 130.

[0035] In some embodiments of the present invention, an annular receiving cavity is formed inside the shell body 121. It can also be understood that the shell body 121 is formed as an annular cylindrical structure and defines an annular receiving cavity. The stator 110 can be disposed in the annular receiving cavity so that the shell body 121 can protect at least a portion of the stator 110, and since the receiving cavity contains a cooling medium, heat dissipation of the stator 110 can be achieved.

[0036] In the axial direction parallel to the stator assembly 100, the outer side wall of the housing body 121 protrudes beyond the inner side wall of the housing body 121; combined with Figure 2 , Figure 4 and Figure 5 The sealing end cap 122 includes a first part 1222 and a second part 1223 connected together. The radially outer end of the first part 1222 protrudes from the second part 1223. The first part 1222 is adapted to seal with the outer wall of the shell body 121, and the second part 1223 is adapted to seal with the inner wall of the shell body 121.

[0037] For example, the sealing end cap 122 can be inserted into the housing body 121. In the radial direction parallel to the stator assembly 100, the outer peripheral wall of the first portion 1222 can abut against and seal against the outer side wall of the housing body 121, and the side of the second portion 1223 away from the first portion 1222 can abut against and seal against the inner side wall of the housing body 121, so that the sealing end cap 122 can seal the open end of the receiving cavity.

[0038] In this case, considering that the peripheral wall of the sealing end cover 122 has a first sub-part 131 for connecting with the stator winding 112, in order to prevent the first sub-part 131 and the housing body 121 from interfering with each other when the sealing end cover 122 is assembled with the housing body 121, the first sub-part 131 can be made to protrude from the second part 1223. Since the radial outer end of the first part 1222 protrudes from the second part 1223, and the radial outer end of the first part 1222 can protrude and be flush with the radial outer end of the first sub-part 131, a space for arranging the first sub-part 131 can be defined between the first sub-part 131 and the second sub-part in the radial direction parallel to the stator assembly 100. When the sealing end cover 122 is engaged with the housing body 121, the risk of interference between the first sub-part 131 and the housing body 121 can be effectively reduced, thereby improving the assembly convenience of the stator assembly 100.

[0039] Combination Figure 3 and Figure 5In some embodiments of the present invention, a portion of the busbar 130 extends from the peripheral wall of the sealing end cap 122 to form a first sub-part 131. In the axial direction parallel to the stator assembly 100, the first sub-part 131 is spaced apart from the first portion 1222. That is, the first sub-part 131 extends from the peripheral wall of the second portion 1223. By spaced apart from the first portion 131 and the first portion 1222 in the axial direction parallel to the stator assembly 100, it is convenient for the first portion 1222 to avoid the first sub-part 131 when the busbar 130 and the sealing end cap 122 are integrally injection molded, thereby preventing the busbar 130 from being unable to achieve electrical connection due to the first portion 1222 covering the first sub-part 131.

[0040] like Figure 3 As shown, in some embodiments of the present invention, the stator assembly 100 further includes: a flat wire winding terminal 150, one end of which is connected to the stator winding 112, and the other end of which abuts against and is connected to the first sub-part 131.

[0041] For example, in the radial direction parallel to the stator assembly 100, the first sub-part 131 may protrude from the peripheral wall of the second part 1223. In the axial direction parallel to the stator assembly 100, one end of the flat wire winding terminal 150 may be welded to the stator winding 112 to realize the electrical connection between the flat wire winding terminal 150 and the stator winding 112. The other end of the flat wire winding terminal 150 may form a bent portion 151. The bent portion 151 may be bent in the direction parallel to the radial direction of the stator assembly 100 toward the housing body 121. The bent portion 151 may abut against the first sub-part 131 and be connected to the first sub-part 131 by welding to realize the electrical connection between the flat wire winding terminal 150 and the stator winding 112, thereby realizing the electrical connection between the busbar 130 and the stator winding 112.

[0042] In the above technical solution, by forming a bent portion 151 in the flat wire winding terminal 150, it is not only beneficial to increase the contact area between the flat wire winding terminal 150 and the first sub-part 131 and improve the connection reliability between the flat wire winding terminal 150 and the first sub-part 131, but also to realize the avoidance of the flat wire winding terminal 150 from the first part 1222, prevent mutual interference between the flat wire winding terminal 150 and the first part 1222, and improve the assembly convenience of the stator assembly 100.

[0043] like Figure 2 As shown, in some embodiments of the present invention, a sealing member 160 is provided on the side of the sealing end cap 122 facing the shell body 121, and the sealing member 160 is used to seal the sealing end cap 122 with the shell body 121.

[0044] For example, the seal 160 can be formed as an elastic member. When the sealing end cap 122 is assembled with the housing body 121, the seal 160 is sandwiched between the sealing end cap 122 and the housing body 121 and deforms due to the compression of the sealing end cap 122 and the housing body 121. The seal 160 can seal the gap between the sealing end cap 122 and the housing body 121 to prevent the cooling medium from leaking through the gap between the sealing end cap 122 and the housing body 121, prevent the loss of cooling medium, and improve the heat dissipation reliability of the cooling medium to the stator assembly 100.

[0045] like Figure 5 As shown, in some embodiments of the invention, the sealing end cap 122 has a mounting groove on the side facing the housing body 121, and the mounting groove is used to set the seal 160.

[0046] For example, the peripheral wall of the sealing end cover 122 is provided with an annular mounting groove. The mounting groove is recessed from the peripheral wall of the sealing end cover 122 toward the central axis of the sealing end cover 122. The sealing member 160 can be embedded in the mounting groove to facilitate the positioning and installation of the sealing member 160 and the sealing end cover 122, thereby improving the assembly convenience of the sealing member 160 and the sealing end cover 122.

[0047] The processing and assembly steps of the stator assembly 100 according to an embodiment of the present invention will be briefly described below.

[0048] First, the busbar 130 and the sealing end cap 122 are integrally injection molded using a mold. The mold can be pre-designed to allow space for the first sub-part 131 and the second sub-part, so that the first sub-part 131 and the second sub-part can be exposed from within and outside the sealing end cap 122, preventing the sealing end cap 122 from exposing the first sub-part 131 and the second sub-part. Then, the flat wire winding terminal 150 can be welded to the lead wire of the stator winding 112 and the first part 1222, respectively. The weld joints are made using insulating heat... The tube is shrunken for protection, and then the seal 160 is installed into the sealing groove 1224 formed on the sealing end cover 122. The sealing end cover 122 is then assembled with the housing body 121. The inverter 200 is then installed onto the sealing end cover 122 by means of a threaded connector 140 (e.g., a bolt). The threaded connector 140 is connected to the connecting part 1221 and electrically connected to the second sub-part. Finally, the connection and conductivity between the inverter 200 and the stator assembly 100 are tested to see if they meet the usage requirements.

[0049] The motor according to an embodiment of the present invention includes the stator assembly 100 described above.

[0050] Since the motor includes the stator assembly 100 mentioned above, by integrally injection molding the busbar 130 and the sealing end cover 122, not only can the assembly steps of the stator assembly 100 be simplified and the production efficiency of the stator assembly 100 be improved, but the connection gap between the busbar 130 and the sealing end cover 122 can also be effectively prevented, thereby effectively reducing the risk of leakage of the cooling medium through the connection gap between the two, improving the reliability of the cooling medium to dissipate heat from the stator 110, and effectively reducing the risk of mutual interference between the busbar 130 and the housing 120 during assembly, ensuring the ease of assembly of the stator assembly 100.

[0051] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0052] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A stator assembly, characterized in that, include: Stator (110); Housing (120), the housing (120) comprising: The shell body (121) has an open-ended receiving cavity formed inside, which is used to install the stator (110) and is adapted to contain the cooling medium; A sealing end cap (122) is provided at the open end of the receiving cavity to close the open end; Bus (130), at least a portion of which is disposed within the sealing end cap (122), and adapted to have a first sub-part (131) formed in the circumferential direction of the sealing end cap (122), the first sub-part (131) being used for electrical connection with the stator winding (112) of the stator (110), and the bus (130) having a second sub-part formed within the sealing end cap (122), the second sub-part being used for electrical connection of the bus (130); The busbar (130) and the sealing end cap (122) are integrally injection molded.

2. The stator assembly according to claim 1, characterized in that, The sealing end cap (122) has a connecting portion (1221) formed at one axial end opposite to the receiving cavity. The connecting portion (1221) is open to the side opposite to the receiving cavity and is adapted to expose at least a portion of the second sub-part.

3. The stator assembly according to claim 2, characterized in that, The connecting part (1221) has an internal thread, and the stator assembly also includes a threaded connector (140), which is threadedly engaged with the internal thread and electrically connected to the second sub-part.

4. The stator assembly according to claim 1, characterized in that, Part of the busbar (130) extends from the peripheral wall of the sealing end cap (122) and forms the first sub-part (131), which is adapted to be connected to the stator winding (112).

5. The stator assembly according to claim 1, characterized in that, The shell body (121) has an annular receiving cavity, and in the axial direction parallel to the stator assembly, the outer side wall of the shell body (121) protrudes from the inner side wall of the shell body (121). The sealing end cap (122) includes a first part (1222) and a second part (1223) connected together. The radially outer end of the first part (1222) protrudes from the second part (1223). The first part (1222) is adapted to seal with the outer wall of the shell body (121), and the second part (1223) is adapted to seal with the inner wall of the shell body (121).

6. The stator assembly according to claim 5, characterized in that, Part of the busbar (130) extends from the peripheral wall of the sealing end cap (122) and forms the first sub-part (131), which is spaced apart from the first part (1222) in an axial direction parallel to the stator assembly.

7. The stator assembly according to claim 1, characterized in that, Also includes: A flat wire winding terminal (150) is provided, one end of which is connected to the stator winding (112), and the other end of which abuts against the first sub-part (131) and is connected to the first sub-part (131).

8. The stator assembly according to claim 1, characterized in that, The sealing end cap (122) has a sealing element (160) on the side facing the shell body (121), and the sealing element (160) is used to seal the sealing end cap (122) with the shell body (121).

9. The stator assembly according to claim 8, characterized in that, The sealing end cap (122) has a mounting groove on the side facing the shell body (121), and the mounting groove is used to set the sealing element (160).

10. An electric motor, characterized in that, Includes the stator assembly according to any one of claims 1-9.

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