Motor stator and motor

Abstract

A motor stator, comprising an iron core (1), a winding (2) and a plurality of power busbars (3). Each power busbar (3) comprises a first electrical connection part (31), a first radial connection section (32), a first axial connection section (33), and a first common section (34). The first electrical connection parts (31) are connected to first conductor connection parts (2c1), the first radial connection sections (32) are connected to the first electrical connection parts (31), and the first axial connection sections (33) are connected to the first radial connection sections (32). All the first axial connection sections (33) are connected to the first common sections (34), the first radial connection sections (32) are located on the axial outer sides of protruding parts (2e), and the first axial connection sections (33) and the first common section (34) are located on the radial outer sides of the protruding parts (2e) and overlap the protruding parts (2e) in the axial direction (A). Therefore, the axial size occupied by the structure of the busbars is reduced. Also provided is a motor comprising the motor stator.

Description

Motor stator and motor Technical Field

[0001] The present application relates to a connection structure between a winding and a busbar of a motor stator, and more particularly to a motor stator and a motor including the motor stator. Background Art

[0002] In pure electric vehicles or hybrid electric vehicles, an electric motor is usually used as a power source to drive the vehicle. In the motor stator, the winding can be electrically connected to the power supply through a busbar, thereby realizing a desired circuit topology (e.g., a triangle topology or a Y-shaped topology). In a typical example, the motor stator may include a power busbar and a neutral busbar, and the different conductor connection parts of the winding are welded together with the power busbar and the neutral busbar to realize electrical connection. For example, in the Chinese invention patent application with publication number CN 115250046 A and titled “Busbar and Motor”, the winding realizes an electrical circuit with a predetermined topology by means of a busbar provided at the end of the stator core and not extending beyond the winding. In the Chinese utility model patent with publication number CN 219643755 U and titled “Busbar, Motor Stator and Flat Wire Motor”, the busbar includes a plurality of connecting bars provided on an insulating seat and arranged radially spaced apart, and the winding realizes an electrical circuit with a predetermined topology through these connecting bars.

[0003] In the technical solution represented by the above patent technology, although the axial space occupied by the bus structure can be reduced to a certain extent, when the bus has a more complex structure, the bus inevitably needs to be staggered and layered on the axial outside of the protruding part of the winding, which will cause the axial size of the motor stator to be too large.

[0004] Summary of the Invention

[0005] This application is made in light of the aforementioned state of the prior art. One object of this application is to provide a motor stator having a busbar structure with a relatively small axial dimension, and even if the busbar structure becomes more complex, the axial dimension of the busbar structure will not increase. Another object of this application is to provide a motor including the aforementioned motor stator.

[0006] In order to achieve the above objectives, this application adopts the following technical solutions.

[0007] The present application provides a motor stator as follows, comprising:

[0008] Iron core;

[0009] a winding mounted on the core and forming an electrical circuit including one or more branches, the winding including a protruding portion extending axially outward from the core, the winding having a plurality of first conductor connecting portions formed on the protruding portion and corresponding to the branches, the plurality of first conductor connecting portions being spaced apart from each other; and

[0010] Multiple power busbars, each of the power busbars is electrically connected to the first conductor connection parts for the same phase power supply of all the branches, the power busbar includes a first electrical connection part, a first radial connection section, a first axial connection section and a first common section fixed to each other, the first electrical connection part is connected to the corresponding first conductor connection part, the first radial connection section is connected to the corresponding first electrical connection part, the first axial connection section is connected to the corresponding first radial connection section, all the first axial connection sections of the same power busbar are connected to the first common section, the first radial connection section is located axially outside the protruding part, the first axial connection section and the first common section are located radially outside the protruding part and are arranged overlapping with the protruding part in the axial direction.

[0011] In an optional solution, the first radial connection sections of all the power busbars are located axially inward of the first electrical connection portion.

[0012] In another optional solution, the first radial connecting section is formed to be flat in the axial direction, and the first radial connecting sections of all the power busbars extend in the same plane.

[0013] In another optional solution, the first axial connecting segment extends along the axial direction, and the first common segment extends along the circumferential direction of the motor stator.

[0014] In another optional solution, the winding has a plurality of second conductor connection portions formed on the protruding portion and corresponding to the branches, the plurality of second conductor connection portions being spaced apart from each other and from the plurality of first conductor connection portions.

[0015] The motor stator also includes a neutral busbar, which is electrically connected to all the second conductor connecting parts. The neutral busbar includes a second electrical connecting part, a second radial connecting section, a second axial connecting section and a second common section fixed to each other. The second electrical connecting part is connected to the corresponding second conductor connecting part, the second radial connecting section is connected to the corresponding second electrical connecting part, the second axial connecting section is connected to the corresponding second radial connecting section, all the second axial connecting sections of the neutral busbar are connected to the second common section, the second radial connecting section is located axially outside the protruding part, and the second axial connecting section and the second common section are located radially outside the protruding part and overlap with the protruding part in the axial direction.

[0016] In another optional scheme, the neutral bus also includes a connecting bridge and an additional common section located axially outside the protruding part, a portion of the second electrical connection part is directly connected to the additional common section, and the additional common section is connected to one of the second radial connecting sections via the connecting bridge.

[0017] In another optional solution, all of the second radial connecting segments are located axially inside the second electrical connecting portion.

[0018] In another optional solution, the second radial connecting segments are formed into a flat structure in the axial direction, and all the second radial connecting segments and all the first radial connecting segments of the power busbars extend in the same plane.

[0019] In another optional solution, the second axial connecting segment extends along the axial direction, and the second common segment extends along the circumferential direction of the motor stator.

[0020] The present application also provides a motor, comprising the motor stator described in any one of the above technical solutions.

[0021] By adopting the above technical solution, the present application provides a motor stator and a motor. The motor stator of the present application includes an iron core, a winding, and multiple power busbars. The winding is mounted on the iron core and forms an electrical circuit including one or more branches. The winding includes a protruding portion extending axially outward from the iron core. The winding has multiple first conductor connecting portions formed on the protruding portion and corresponding to the branches, and the multiple first conductor connecting portions are spaced apart from each other. Each power busbar is electrically connected to the first conductor connecting portions for the same phase of power in all branches. The power busbar includes a first electrical connecting portion, a first radial connecting section, a first axial connecting section, and a first common section, which are fixed to each other. The first electrical connecting portion is connected to the corresponding first conductor connecting portion, the first radial connecting section is connected to the corresponding first electrical connecting portion, the first axial connecting section is connected to the corresponding first radial connecting section, and all first axial connecting sections of the same power busbar are connected to the first common section. In addition, the first radial connecting section is located axially outward of the protruding portion, and the first axial connecting section and the first common section are located radially outward of the protruding portion and axially overlap with the protruding portion.

[0022] Thus, on the one hand, because part of the busbar structure is arranged radially outside the protruding portion of the winding, rather than entirely axially outside the protruding portion, the axial dimension occupied by the busbar structure can be reduced. On the other hand, because part of the busbar structure is arranged radially outside the protruding portion of the winding, if the busbar structure is relatively complex and different parts need to be arranged overlappingly, they do not need to be arranged axially outside the protruding portion of the winding. Instead, they can be arranged radially outside the protruding portion, thereby maintaining a relatively small axial dimension for the busbar structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] FIG1 is a perspective schematic diagram showing a partial structure of a motor according to an embodiment of the present application, in which an assembly of a housing and a motor stator is shown.

[0024] FIG. 2 is a perspective schematic diagram showing a motor stator of the motor in FIG. 1 .

[0025] FIG. 3 is a perspective schematic diagram showing all busbars of the motor stator in FIG. 2 .

[0026] FIG. 4 is a perspective schematic diagram showing the first power bus bar in FIG. 3 .

[0027] FIG. 5 is a perspective schematic diagram showing the neutral busbar in FIG. 3 .

[0028] Explanation of the reference numerals: H housing; S motor stator; 1 iron core; 2 winding; 2e extension portion; 2c1 first conductor connection portion; 2c2 second conductor connection portion; 3 power bus; 3a first power bus; 3b second power bus; 3c third power bus; 31 first electrical connection portion; 32 first radial connection segment; 33 first axial connection segment; 34 first common segment; 35 first pin portion; 4 neutral bus; 41 second electrical connection portion; 42 second radial connection segment; 43 second axial connection segment; 44 second common segment; 45 second pin portion; 46 connecting bridge; 47 additional common segment; A axial direction; C circumferential direction. DETAILED DESCRIPTION

[0029] The specific embodiments of the present application will be described in detail below in conjunction with the accompanying drawings. It should be understood that these specific descriptions are only used to teach those skilled in the art how to implement the present application, and are not intended to exhaust all possible methods of the present application, nor to limit the scope of the present application.

[0030] In this application, unless otherwise specified, "axial," "radial," and "circumferential" refer to the axial, radial, and circumferential directions of the motor stator (iron core), respectively. "Axially outer" refers to the side axially away from the center plane of the axial dimension of the motor stator iron core; "axially inner" refers to the side axially closer to the center plane of the axial dimension of the motor stator iron core; "radially outer" refers to the side radially away from the central axis of the motor stator; and "radially inner" refers to the side radially closer to the central axis of the motor stator.

[0031] In the present application, each part of the busbar can be formed into a flat plate shape or a strip shape with a rectangular cross-section. In addition, in the case of the above structure, being flat in the axial direction means that the axial size of each part of the busbar is small, while the radial size and the circumferential size can be set to be large.

[0032] In the present application, the two parts overlapping in the axial direction means that the two parts at least partially overlap in the axial direction, that is, the two parts are formed into a structure that blocks each other when viewed along a radial direction perpendicular to the axial direction.

[0033] The following describes a motor and a motor stator according to an embodiment of the present application with reference to the accompanying drawings.

[0034] As shown in FIG1 , a motor according to an embodiment of the present application includes a housing H, a motor stator S, and a motor rotor, which are assembled together. The motor stator S and the motor rotor are mounted inside the housing H, with the motor rotor located radially inward of the motor stator S with an air gap between the two. Furthermore, as shown in FIG1 and FIG2 , the motor stator S includes an iron core 1, a winding 2, and a plurality of busbars (a power busbar 3 and a neutral busbar 4), which are assembled together. The winding 2 is fixedly mounted on the iron core 1, and the plurality of busbars 3 and 4 are fixedly mounted on the winding 2 and electrically connected to the winding 2.

[0035] In this embodiment, the iron core 1 can be formed by stacking silicon steel sheets. As shown in Figures 1 and 2, the iron core 1 is formed with a plurality of slots spaced evenly along the circumferential direction C. The conductors of the winding 2 (e.g., flat wires) are respectively inserted into the corresponding slots and arranged in layers in the radial direction in each slot. The conductors of the winding 2 also extend outward from the axial ends of the iron core 1, thereby the winding 2 has protruding portions 2e located on both axial sides of the iron core 1. Furthermore, at the protruding portion 2e located on one axial side, the winding 2 has a plurality of first conductor connecting portions 2c1 (six first conductor connecting portions 2c1 in this embodiment) and a plurality of second conductor connecting portions 2c2 (six second conductor connecting portions 2c2 in this embodiment) for connecting to a plurality of busbars 3 and 4. The first conductor connecting portions 2c1 and the second conductor connecting portions 2c2 serve as connection locations for connecting the conductors of the winding 2 to the busbars 3 and 4 to achieve electrical connection. These conductor connection portions 2c1, 2c2 are relatively concentrated and spaced apart from each other within a predetermined area in the circumferential direction C, thereby facilitating the installation of the busbars 3 and 4. Within the predetermined area, the three radially inner first conductor connection portions 2c1 are evenly spaced apart from each other in the circumferential direction C, and the three radially outer first conductor connection portions 2c1 are evenly spaced apart from each other in the circumferential direction C. Furthermore, each first conductor connection portion 2c1 is arranged to extend axially outward along the axial direction A relative to the protruding portion 2e, with different first conductor connection portions 2c1 located at different circumferential positions, and each first conductor connection portion 2c1 may have the same axial dimensions. Within the predetermined area, the three radially inner second conductor connection portions 2c2 are evenly spaced apart from each other in the circumferential direction C, and the three radially outer second conductor connection portions 2c2 are evenly spaced apart from each other in the circumferential direction C. Furthermore, each second conductor connection portion 2c2 is arranged to extend axially outward relative to the protruding portion 2e along the axial direction A. Different second conductor connection portions 2c2 are located at different circumferential positions, and each second conductor connection portion 2c2 can have the same axial dimensions and the same axial dimensions as the first conductor connection portion 2c1. Furthermore, in this embodiment, the winding 2 forms an electrical circuit having two parallel branches, each branch having a Y-shaped topology. The two branches correspond to different first conductor connection portions 2c1 and second conductor connection portions 2c2, respectively.

[0036] In this embodiment, each busbar 3, 4 can be made by secondary molding, so that each busbar can have a core made of a conductive material (such as a metal material) and an insulating portion surrounded on the outside of the core. It can be understood that the core of the busbars 3, 4 is exposed at the first conductor connection portion 2c1 and the second conductor connection portion 2c2 where electrical connection is required. As shown in Figures 2 and 3, the multiple busbars 3, 4 include three power busbars 3 and one neutral busbar 4. The three power busbars 3 can be used to electrically connect to the three-phase power supply respectively, and each power busbar 3 is electrically connected to the first conductor connection portion 2c1 of the two branches for the same phase power supply. The neutral busbar 4 can be used to electrically connect to the ground wire, and the neutral busbar 4 is electrically connected to all the second conductor connection portions 2c2.

[0037] Specifically, as shown in Figures 2 and 3, the power bus 3 includes a first power bus 3a, a second power bus 3b and a third power bus 3c arranged separately from each other, wherein after being installed in place, the first power bus 3a can correspond to U of the three-phase AC power supply, the second power bus 3b can correspond to V of the three-phase AC power supply, and the third power bus 3c can correspond to W of the three-phase AC power supply.

[0038] The structure of the power bus 3 is described below using the first power bus 3a as an example. The sizes and shapes of the various components of different power busses 3 can be adjusted adaptively. As shown in Figure 4, the power bus 3 includes an integrally formed first electrical connection portion 31, a first radial connection segment 32, a first axial connection segment 33, a first common segment 34, and a first pin portion 35. The two first electrical connection portions 31 can be electrically connected to the corresponding first conductor connection portions 2c1, for example, by welding. One first electrical connection portion 31 is connected to the radially outer first conductor connection portion 2c1, and the other first electrical connection portion 31 is connected to the radially inner first conductor connection portion 2c1. Two first radial connection segments 32 are connected to the corresponding first electrical connection portions 31. One first radial connection segment 32 is connected to the axially inner end of one first electrical connection portion 31, and the other first radial connection segment 32 is connected to the axially inner end of the other first electrical connection portion 31. Each first radial connection segment 32 is flattened in the axial direction A, and both first radial connection segments 32 extend in the same plane. In addition, the first radial connecting section 32 does not necessarily extend radially throughout, but may be bent at least once to avoid other structures. Two first axial connecting sections 33 are connected to corresponding first radial connecting sections 32, with one first axial connecting section 33 connected to the radially outer end of one first radial connecting section 32, and the other first axial connecting section 33 connected to the radially outer end of the other first radial connecting section 32. The two first axial connecting sections 33 are bent axially inward relative to the first radial connecting section 32 and extend linearly along the axial direction A. Thus, the first radial connecting section 32 is located axially outward of the protruding portion 2e, and the first axial connecting section 33 and the first common section 34 are located radially outward of the protruding portion 2e and overlap with the protruding portion 2e in the axial direction A. For this power bus 3, the two first axial connecting sections 33 are connected to the first common section 34, and the first common section 34 extends circumferentially (including extending substantially circumferentially). The first pin portion 35 is disposed on the first common section 34 and extends radially outward.

[0039] The second power bus 3b and the third power bus 3c may have the same or similar structural features as the first power bus 3a, but the specific dimensions and specific bending shapes of each part may be different. Furthermore, as shown in Figures 2 and 3, the first radial connecting sections 32 of all power buses 3 are not only located axially inward of the first electrical connection portion 31 but also extend in the same plane. The axially outer end surfaces of the first radial connecting sections 32 of all power buses 3 may be flush with each other. Moreover, when viewed along the axial direction A, these first radial connecting sections 32 are completely offset from each other; all first axial connecting sections 33 extend along the axial direction A, and when viewed radially, these first axial connecting sections 33 are completely offset from each other.

[0040] As shown in Figure 5, the neutral busbar 4 is electrically connected to all second conductor connecting portions 2c2. The neutral busbar 4 includes an integrally formed second electrical connecting portion 41, a second radial connecting segment 42, a second axial connecting segment 43, a second common segment 44, a second pin portion 45, a connecting bridge 46, and an additional common segment 47. The three second electrical connecting portions 41 are connected to the three radially outer second conductor connecting portions 2c2, for example, by welding, with different second electrical connecting portions 41 connected to different second conductor connecting portions 2c2. The three second radial connecting segments 42 are respectively connected to the axially inner ends of corresponding second electrical connecting portions 41. Each second radial connecting segment 42 is flattened in the axial direction A. All second radial connecting segments 42 and all first radial connecting segments 32 extend coplanarly. The axially outer end surfaces of all second radial connecting segments 42 and all first radial connecting segments 32 may be flush with each other. Furthermore, the second radial connecting segments 42 do not necessarily extend entirely radially, but may be bent at least once to avoid other structures. The three second axial connecting segments 43 are respectively connected to the radially outer ends of the corresponding second radial connecting segments 42. The three second axial connecting segments 43 bend axially inward relative to the second radial connecting segments 42 and extend linearly along the axial direction A. All second axial connecting segments 43 are connected to the second common segment 44. The second radial connecting segment 42 is located axially outward of the extension 2e. The second axial connecting segments 43 and the second common segment 44 are located radially outward of the extension 2e and overlap with the extension 2e in the axial direction A. Furthermore, a connecting bridge 46 and an additional common segment 47 are located axially outward of the extension 2e. The second electrical connection portion 41, which is used to connect to the three radially inner second conductor connecting portions 2c2, is directly connected to the additional common segment. The additional common segment 47 is connected to one of the second radial connecting segments 42 via a connecting bridge 46. When viewed along the axial direction A, the connecting bridge 46 overlaps with one of the first radial connecting segments 32 of the second power busbar 3b. The second axial connecting segments 43 extend along the axial direction A, and the second common segment 44 extends along the circumferential direction C of the motor stator S. In addition, the second pin portion 45 is provided in the second common section 44 and extends radially outward. When viewed along the axial direction A, the second pin portion 45 and all the first pin portions 35 are offset from each other.

[0041] By adopting the above-described structure, busbars 3 and 4 are partially arranged radially outside the protruding portion 2e of winding 2, rather than entirely arranged axially outside the protruding portion 2e. This significantly reduces the axial dimension of the busbars. Furthermore, since the busbars are partially arranged radially outside the protruding portion 2e of winding 2, if different portions of the busbars 3 and 4 need to overlap, they do not need to overlap axially outside the protruding portion 2e of winding 2. Instead, they can overlap radially outside the protruding portion 2e, thereby maintaining a consistently small axial dimension for the busbars. The first common portion of power busbar 3 and the second common portion of neutral busbar 4 are radially offset, and the first pin portion 35 and the second pin portion 45 are circumferentially offset. This eliminates the need for axially staggered or layered busbars, thereby maintaining a safe electrical clearance without increasing the axial dimension.

[0042] It should be understood that the above embodiments are merely illustrative and are not intended to limit the present application. Those skilled in the art may, based on the teachings of this application, make various modifications and alterations to the above embodiments without departing from the scope of this application. Further, the following supplementary explanations are provided.

[0043] i. It is understood that the connection between the busbars 3 and 4 and the first and second conductor connecting portions 2c1 and 2c2 can be achieved by welding. Furthermore, in other optional examples, the first and second conductor connecting portions 2c1 and 2c2 can be bent to extend radially, and the electrical connection portion of the busbar can be bent to extend radially accordingly. This further reduces the axial dimension of the entire motor stator S. Even if the radial weld length between the busbars 3 and 4 and the first and second conductor connecting portions 2c1 and 2c2 is increased to improve connection strength, the axial dimension of the motor stator S will not be increased.

[0044] ii. In the above specific embodiment, the neutral busbar 4 includes the connecting bridge 46 and the additional common section 47, but the present application is not limited thereto. For example, in other optional examples, the neutral busbar 4 can omit the connecting bridge 46 and the additional common section 47, and can still achieve electrical connection with the six second conductor connecting portions 2c2 through the configuration of the second radial connecting section 42, the second axial connecting section 43, and the second common section 44.

[0045] iii. It can be understood that in the motor stator S of the present application, part of the structure of the busbars 3 and 4 is arranged in the space between the protruding portion 2e of the winding 2 of the motor stator S and the housing H, and does not extend axially outside the overall structure composed of the conductor connecting portions 2c1, 2c2 and the electrical connecting portions 31, 32 in the axial direction A, thereby enabling the axial size of the structure of the busbars 3 and 4 to be smaller.

[0046] iv. In the above specific embodiment, the electrical circuit formed by the winding 2 has two parallel branches with a Y-shaped topology, but the present application is not limited to this. In other optional examples, in the motor stator S of the present application, the electrical circuit formed by the winding 2 may have only one branch with a Y-shaped topology, or the electrical circuit formed by the winding 2 may have one or more branches with a delta topology. Thus, different numbers of power buses 3 and neutral buses 4 can be provided depending on the topology of the electrical circuit and the number of phases of the external power supply.

[0047] v. It can be understood that in the present application, at least one first common segment 34 can be bent in the radial direction, and the second common segment 44 can be bent in the radial direction.

Claims

1. A motor stator, comprising: Iron core (1); A winding (2) mounted on the iron core (1) and forming an electrical circuit including one or more branches, the winding (2) including a protruding portion (2e) extending axially outward from the iron core (1), the winding (2) having a plurality of first conductor connecting portions (2c1) formed on the protruding portion (2e) and corresponding to the branches, the plurality of first conductor connecting portions (2c1) being spaced apart from each other; as well as A plurality of power busbars (3), each of the power busbars (3) being electrically connected to the first conductor connection portion (2c1) for the same phase power supply of all the branches, the power busbar (3) comprising a first electrical connection portion (31), a first radial connection segment (32), a first axial connection segment (33) and a first common segment (34) fixed to each other, the first electrical connection portion (31) being connected to the corresponding first conductor connection portion (2c1), the first radial connection segment (32) being connected to the corresponding first electrical connection portion (31), the first axial connection segment (33) being connected to the corresponding first radial connection segment (32), all the first axial connection segments (33) of the same power busbar (3) being connected to the first common segment (34), the first radial connection segment (32) being located axially outside the protruding portion (2e), the first axial connection segment (33) and the first common segment (34) being located radially outside the protruding portion (2e) and being arranged overlapping with the protruding portion (2e) in the axial direction (A).

2. The motor stator according to claim 1, characterized in that: The first radial connection sections (32) of all the power busbars (3) are located axially inside the first electrical connection portion (31).

3. The motor stator according to claim 2, characterized in that: The first radial connection section (32) is formed into a flat structure in the axial direction (A), and the first radial connection sections (32) of all the power busbars (3) extend in the same plane.

4. The motor stator according to claim 1, characterized in that: The first axial connecting section (33) extends along the axial direction (A), and the first common section (34) extends along the circumferential direction (C) of the motor stator (S).

5. The motor stator according to any one of claims 1 to 4, characterized in that: The winding (2) has a plurality of second conductor connection portions (2c2) formed on the protruding portion (2e) and corresponding to the branches, the plurality of second conductor connection portions (2c2) being spaced apart from each other and from the plurality of first conductor connection portions (2c1). The motor stator (S) further includes a neutral busbar (4), wherein the neutral busbar (4) is electrically connected to all the second conductor connection parts (2c2), and the neutral busbar (4) includes a second electrical connection part (41), a second radial connection section (42), a second axial connection section (43) and a second common section (44) fixed to each other, wherein the second electrical connection part (41) is connected to the corresponding second conductor connection part (2c2), the second radial connection section (42) is connected to the corresponding second electrical connection part (41), the second axial connection section (43) is connected to the corresponding second radial connection section (42), and all the second axial connection sections (43) of the neutral busbar (4) are connected to the second common section (44), the second radial connection section (42) is located axially outside the protruding portion (2e), and the second axial connection section (43) and the second common section (44) are located radially outside the protruding portion (2e) and are arranged to overlap with the protruding portion (2e) in the axial direction (A).

6. The motor stator according to claim 5, characterized in that: The neutral busbar (4) further comprises a connecting bridge (46) and an additional common section (47) located axially outside the protruding portion (2e), a portion of the second electrical connection portion (41) being directly connected to the additional common section (47), and the additional common section (47) being connected to one of the second radial connecting sections (42) via the connecting bridge (46).

7. The motor stator according to claim 5 or 6, characterized in that: All of the second radial connecting sections (42) are located axially inside the second electrical connecting portion (41).

8. The motor stator according to claim 7, characterized in that: The second radial connecting segments (42) are formed into a flat structure in the axial direction (A), and all the second radial connecting segments (42) and all the first radial connecting segments (32) of the power busbars (3) extend in the same plane.

9. The motor stator according to claim 5 or 6, characterized in that: The second axial connection section extends along the axial direction (A), and the second common section (44) extends along the circumferential direction (C) of the motor stator (S).

10. An electric motor comprising the electric motor stator (S) according to any one of claims 1 to 9.

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