Motor stator and motor

Abstract

An electric machine stator is provided comprising a core (1), a winding (2) and a plurality of busbars (3, 4) assembled together. The winding (2) is attached to the core (1) and includes a plurality of conductor connection portions (2e). The plurality of conductor connection portions (2e) are spaced apart from each other in a circumferential direction of the motor stator, each conductor connection portion (2e) extending in a radial direction of the motor stator, and different conductor connection portions (2e) extending in different radial directions. Each busbar (3, 4) is electrically connected to a corresponding conductor connection (2e). Therefore, compared with the scheme that the conductor connecting parts extend along the axial direction of the motor stator, all the conductor connecting parts extend along the radial direction of the motor stator in the scheme of the invention, so that the axial size of the motor stator can be greatly shortened. The invention also provides 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 windings can be electrically connected to the power supply through a busbar and realize a desired topology (such as a star structure).

[0003] In a typical example, the motor stator may include a three-phase busbar and a neutral busbar, and the different conductor connection parts of the winding are welded together with the three-phase busbar and the neutral busbar to achieve electrical connection. In the existing technical solution, the different conductor connection parts of the winding are all constructed to extend along the axial direction of the motor stator. In order to ensure the connection strength between the winding and the three-phase busbar and the neutral busbar, the conductor connection parts of the winding need to extend a sufficient length in the axial direction. Furthermore, in order to ensure a safe electrical gap between the three-phase busbar and the neutral busbar, the three-phase busbar and the neutral busbar need to be staggered and layered in the axial direction, which further increases the axial length of the conductor connection parts of the winding. Therefore, the above solution not only causes the axial size of the motor stator to be too large, but also increases the manufacturing cost and manufacturing difficulty of the winding connection structure.

[0004] Summary of the Invention

[0005] This application is made in view of the above-mentioned state of the prior art. One object of this application is to provide a motor stator having a smaller axial dimension than a motor stator in which the conductor connection portion connected to the busbar extends in the axial direction. Another object of this application is to provide a motor including the above-mentioned 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 comprising a plurality of conductor connecting portions, the plurality of conductor connecting portions being spaced apart from each other in a circumferential direction of the motor stator, each of the conductor connecting portions extending in a radial direction of the motor stator, and different conductor connecting portions extending in different radial directions; and

[0010] A plurality of bus bars are provided, each of the bus bars being electrically connected to a corresponding conductor connection portion.

[0011] In an optional solution, the conductor connecting portion includes an axial end surface for connecting to the busbar, and the axial end surfaces of all the conductor ends are located in the same plane.

[0012] In another optional solution, each of the conductor connecting portions is located at the same radial position and has the same radial size.

[0013] In another optional scheme, the multiple busbars are all constructed to be flat in the axial direction, and include a power busbar and a neutral busbar, the power busbar and the neutral busbar are in the same axial installation position, the power busbar is used to electrically connect the power supply with the corresponding conductor connection part, and the neutral busbar is electrically connected to the power busbar via the winding.

[0014] In another optional scheme, each of the power buses includes a first common part and two first pin parts, the two first pin parts are connected to the first common part in a manner spaced apart from each other, the first pin parts are connected to the conductor connecting part and the first common part is located radially outside the conductor connecting part, and the first common part is used to be electrically connected to the power supply.

[0015] In another optional solution, for the same power bus, the two first pin portions are respectively connected to two conductor connecting portions that are adjacent in the circumferential direction of the motor stator.

[0016] In another optional scheme, the neutral bus includes a second common part and a plurality of second pin parts, the plurality of second pin parts are connected to the second common part in a manner spaced apart from each other, the second pin parts are connected to the conductor connecting part and the second common part is located radially inward of the conductor connecting part.

[0017] In another optional solution, the second common portion is formed as an arc-shaped structure extending along the circumference of the motor stator.

[0018] In another optional solution, the second pin portion is arranged between two adjacent power bus bars in the circumferential direction of the motor stator.

[0019] The present application also provides the following motor, comprising the motor stator described in any one of the above technical solutions.

[0020] By adopting the above technical solution, the present application provides a motor stator and a motor. In the motor stator of the present application, it includes an iron core, a winding and a plurality of busbars. The winding is installed on the iron core, and the winding includes a plurality of conductor connecting parts spaced apart from each other in the circumferential direction of the motor stator. Each conductor end is bent to extend along the radial direction of the motor stator, different conductor connecting parts extend along different radial directions, and the busbar is electrically connected to the corresponding conductor connecting parts. In this way, compared with the solution in which the conductor connecting parts extend along the axial direction of the motor stator, since all the conductor connecting parts extend along the radial direction of the motor stator in the solution of the present application, the axial dimension of the motor stator can be greatly shortened.

[0021] Furthermore, in a further optional solution, the conductor connection portion includes an axial end surface for connection to a busbar, and the axial end surfaces of all the conductor connection portions lie in the same plane. Thus, compared to solutions in which a busbar connected to multiple conductor connection portions needs to be staggered and layered in the axial direction to ensure electrical clearance, in the solution of the present application, the multiple conductor connection portions are separated from each other in the circumferential direction of the motor stator, thereby allowing for axial staggering or layering. This further reduces the axial dimension of the motor stator and reduces manufacturing difficulty and cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] FIG1 is a perspective schematic diagram showing a stator of a motor according to an embodiment of the present application.

[0023] FIG. 2 is a perspective schematic diagram showing a combination of an iron core and a coil of the motor stator in FIG. 1 .

[0024] FIG. 3 is a perspective schematic diagram showing a partial structure of the motor stator in FIG. 1 .

[0025] DESCRIPTION OF REFERENCE NUMERALS 1 iron core; 2 winding; 2e conductor connection portion; 2s axial end surface; 3 power busbar; 31 first common portion; 32 first pin portion; 3a first phase busbar; 3b second phase busbar; 3c third phase busbar; 4 neutral busbar; 41 second common portion; 42 second pin portion; A axial direction DETAILED DESCRIPTION

[0026] 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.

[0027] In this application, unless otherwise specified, "axial," "radial," and "circumferential" refer to the axial, radial, and circumferential directions of the motor stator, respectively. "Radially outward" refers to the side radially away from the central axis of the motor stator, and "radially inward" refers to the side radially closer to the central axis of the motor stator.

[0028] In the present application, the busbar being formed to be flat in the axial direction means that the axial dimension of each portion of the busbar is small, while the radial dimension and circumferential dimension can be set to be large. In the following specific embodiments, when each portion of the busbar is formed into a flat plate shape or a strip shape, the thickness direction of the busbar is consistent with the axial direction.

[0029] The following describes a motor stator according to an embodiment of the present application with reference to the accompanying drawings.

[0030] As shown in Figures 1, 2, and 3, a motor stator according to an embodiment of the present application includes an assembled iron core 1, a winding 2, and multiple busbars (a power busbar 3 and a neutral busbar 4). The winding 2 is fixedly mounted to the iron core 1, and the multiple busbars 3 and 4 are fixedly mounted to the winding 2 and electrically connected to the winding 2.

[0031] In this embodiment, the core 1 is formed by stacking silicon steel sheets. As shown in Figures 1, 2, and 3, the core 1 is formed with a plurality of slots spaced evenly along the circumference. The conductors of the winding 2 (e.g., flat wire) are inserted into corresponding slots and arranged radially in layers within each slot. The conductors of the winding 2 also extend from both axial ends of the core 1.

[0032] Furthermore, as shown in Figures 1, 2 and 3, in the protruding portion of the winding 2 located on one axial side, the winding 2 has a plurality of conductor connection portions 2e (twelve conductor connection portions 2e in this embodiment) for connecting to a plurality of busbars 3 and 4. These conductor connection portions 2e serve as connection locations where the conductors of the winding are connected to the busbars 3 and 4 to achieve electrical connection. These conductor connection portions 2e are relatively concentratedly arranged in a predetermined area in the circumferential direction, thereby facilitating the installation of the busbars 3 and 4. Within the predetermined area, the plurality of conductor connection portions 2e are evenly arranged spaced apart from each other in the circumferential direction. Each conductor connection portion 2e is bent to extend radially outward, that is, different conductor connection portions 2e extend along different radial directions and the free end of each conductor connection portion 2e is located at the radially outermost side of the conductor connection portion 2e. As shown in FIG2 , the conductor connecting portion 2 e has an axial end surface 2 s for connecting to the busbars 3 and 4 . The axial end surfaces 2 s of all the conductor connecting portions 2 e are located in the same plane, thereby ensuring that the busbars 3 and 4 are located in the same axial position after installation and are not misaligned or delaminated in the axial direction A. In addition, each conductor connecting portion 2 e is located in the same radial position and has the same radial dimension.

[0033] In this embodiment, as shown in Figure 1, each busbar 3, 4 is made of a conductive material (such as a metal material) and is fixed together with the corresponding conductor connection part 2e in an electrically connected manner. Specifically, the multiple busbars 3, 4 include three power busbars 3 and one neutral busbar 4. The power busbar 3 and the neutral busbar 4 are both constructed to be flat in the axial direction A, so that when the power busbar 3 and the neutral busbar 4 are installed on the axial end face 2s of the conductor connection part 2e, the increase in the axial size of the motor stator due to the thickness of the busbar is as small as possible. When the power busbar 3 and the neutral busbar 4 are both installed on the axial end face 2s of the conductor connection part 2e, since the axial end face 2s is located in the same plane, the power busbar 3 and the neutral busbar 4 are in the same axial installation position. Different power busbars 3 are used to electrically connect the power supply to the corresponding conductor connection parts 2e, and the neutral busbar 4 is electrically connected to the power busbar 3 via the winding 2, so that the winding 2 can realize a star topology structure in this embodiment.

[0034] Furthermore, as shown in Figure 1 , the power busbars 3 include a first-phase busbar 3a, a second-phase busbar 3b, and a third-phase busbar 3c, spaced apart from each other. Once installed, the first-phase busbar 3a corresponds to U of the three-phase AC power supply, the second-phase busbar 3b corresponds to V, and the third-phase busbar 3c corresponds to W. As shown in Figures 1 and 3 , each power busbar 3 includes a first common portion 31 and two first pin portions 32, which are integrally formed. The first common portion 31 has a flat plate shape and is formed with a through-hole extending along the axial direction A. It serves as an input terminal connected to the power supply. The two first pin portions 32 are formed as straight strips with a rectangular cross-section. They are spaced apart from each other and connected to the first common portion 31, serving as output terminals connected to the windings 2. The first pin portions 32 extend in the same direction as the corresponding conductor connection portion 2e, and are fixed together so that they overlap when viewed axially. When the first pin portion 32 is connected to the conductor connection portion 2e, the first common portion 31 is located radially outward of the conductor connection portion 2e. Furthermore, for a single power busbar 3, the two first pin portions 32 are respectively connected to two adjacent conductor connection portions 2e in the circumferential direction of the motor stator. This facilitates simplifying the structure of the power busbar 3 and reducing its size.

[0035] Furthermore, as shown in Figures 1 and 3, the neutral busbar 4 includes an integrally formed second common portion 41 and six second pin portions 42. The second common portion 41 is formed as an arcuate strip extending along the circumference of the motor stator. The six second pin portions 42 are formed as straight strips extending along different radial directions and are connected to the second common portion 41 in a spaced-apart manner. The second pin portions 42 extend in the same direction as the corresponding conductor connection portion 2e and are fixedly mounted so as to overlap with each other when viewed axially. When the second pin portions 42 are connected to the conductor connection portion 2e, the second common portion 41 is located radially inward of the conductor connection portion 2e. Furthermore, two second pin portions 42 are provided between adjacent power busbars 3 circumferentially of the motor stator. In other words, the first pin portions 32 of each power busbar 3 are arranged in groups of two, and the second pin portions 42 of the neutral busbar 4 are arranged in groups of two. Different groups of first pin portions 32 and second pin portions 42 are arranged alternately in the circumferential direction. By adopting the above-mentioned structural arrangement, the first common portion 31 of the power bus 3 and the second common portion 41 of the neutral bus 4 are staggered in the radial direction, and the first pin portion 32 and the second pin portion 42 are staggered in the circumferential direction. As a result, the buses 3 and 4 do not need to be staggered or layered in the axial direction, thereby ensuring a safe electrical gap without additionally increasing the axial dimension.

[0036] 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.

[0037] i. The present application also provides a motor, comprising the motor stator and the motor rotor according to the present application. The motor stator may be located radially outside the motor rotor and spaced apart from the motor rotor by a predetermined gap.

[0038] ii. It will be appreciated that, in the technical solution of the present application, to ensure a relatively small axial dimension for the structure electrically connecting the winding 2 and the busbars 3 and 4, the conductor connection portion 2e for connection to the busbars is bent to extend radially. Furthermore, each busbar is configured to be flat in the axial direction A, and all busbars 3 and 4 are located at substantially the same axial position. Thus, the axial dimension of the motor stator according to the present application is relatively small, and the motor stator structure is relatively simple, making it easier to manufacture and assemble, thereby reducing the corresponding cost.

[0039] iii. It is understandable that the busbars 3, 4 and the conductor connecting portion 2e can be connected to each other by welding. Even if the radial welding length between the busbars 3, 4 and the conductor connecting portion 2e is increased to improve the connection strength, the axial size of the motor stator will not be increased.

[0040] iv. In order to avoid possible interference with the conductor connection portion 2e, as shown in Figures 1 and 2, some of the conductor connection structures of the winding 2 located on the same side as the conductor connection portion 2e can also be constructed (for example, bent) to extend radially, so that these conductor connection structures can extend parallel to the conductor connection portion 2e at a distance.

Claims

1. A motor stator, comprising: Iron core (1); A winding (2), which is mounted on the core (1) and comprises a plurality of conductor connection portions (2e), wherein the plurality of conductor connection portions (2e) are spaced apart from each other in the circumferential direction of the motor stator, each of the conductor connection portions (2e) extends along the radial direction of the motor stator, and different conductor connection portions (2e) extend along different radial directions; as well as A plurality of busbars (3, 4), each of the busbars (3, 4) being electrically connected to a corresponding conductor connection portion (2e).

2. The motor stator according to claim 1, characterized in that: The conductor connecting portion (2e) comprises an axial end surface (2s) for connecting to the busbars (3, 4), and the axial end surfaces (2s) of all the conductor ends (2e) are located in the same plane.

3. The motor stator according to claim 1 or 2, characterized in that: Each of the conductor connecting parts (2e) is located at the same radial position and has the same radial size.

4. The motor stator according to any one of claims 1 to 3, characterized in that: The plurality of busbars (3, 4) are each constructed to be flat in the axial direction (A), and include a power busbar (3) and a neutral busbar (4), wherein the power busbar (3) and the neutral busbar (4) are located in the same axial installation position, the power busbar (3) being used to electrically connect a power source to the corresponding conductor connection portion (2e), and the neutral busbar (4) being electrically connected to the power busbar (3) via the winding (2).

5. The motor stator according to claim 4, characterized in that: Each of the power bus bars (3) comprises a first common portion (31) and two first pin portions (32), wherein the two first pin portions (32) are connected to the first common portion (31) in a manner spaced apart from each other, the first pin portion (32) is connected to the conductor connecting portion (2e) and the first common portion (31) is located radially outside the conductor connecting portion (2e), and the first common portion (31) is used for being electrically connected to the power source.

6. The motor stator according to claim 5, characterized in that: For the same power busbar (3), the two first pin portions (32) are respectively connected to two conductor connection portions (2e) adjacent to each other in the circumferential direction of the motor stator.

7. The motor stator according to claim 5 or 6, characterized in that: The neutral busbar (4) comprises a second common portion (41) and a plurality of second pin portions (42), wherein the plurality of second pin portions (42) are connected to the second common portion (41) in a manner spaced apart from one another, the second pin portions (42) are connected to the conductor connecting portion (2e), and the second common portion (41) is located radially inward of the conductor connecting portion (2e).

8. The motor stator according to claim 7, characterized in that: The second common portion (41) is formed into an arc-shaped structure extending along the circumferential direction of the motor stator.

9. The motor stator according to claim 7, characterized in that: The second pin portion (42) is arranged between two adjacent power bus bars (3) in the circumferential direction of the motor stator.

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

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