A stator winding, a stator and an electric machine
By employing a combination of multi-layer coil groups and conductors with different pitches in the stator winding, the problem of low copper fill factor was solved, thereby improving motor performance and reducing noise.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- BORGWARNER POWERDRIVE SYST (TIANJIN) CO CHINA
- Filing Date
- 2025-06-24
- Publication Date
- 2026-07-17
AI Technical Summary
The existing flat wire motor with odd-numbered stator winding structure of q=2 has a low copper fill factor, resulting in poor motor performance and problems with noise and torque fluctuation.
A multi-layer stator winding structure is adopted, including first and second coil groups arranged in the radial direction of the stator core. Combined with conductors with different pitches and welding structures, the distribution of the coil groups on the stator core is optimized, the amount of copper is increased, and the copper fill factor is improved.
This increases the copper fill factor of the motor, reduces the motor size, decreases noise and torque fluctuations, and improves motor performance.
Smart Images
Figure CN224520801U_ABST
Abstract
Claims
1. A stator winding comprising multiple phase windings, characterized in that: In any phase winding, there are a first coil group and a second coil group arranged sequentially along the radial direction of the stator core, wherein, The first coil group includes a plurality of first conductors arranged sequentially along the circumferential direction of the stator core, and the two slots of the first conductors are located in the same radial layer of the stator core; The second coil group includes a plurality of first conductor groups arranged sequentially along the circumferential direction of the stator core, wherein the two sets of slots of the first conductor groups are disposed in two radially adjacent layers of the stator core; At the welding end of any phase winding, there are multiple first welding structures and multiple second welding structures. The first welding structures are arranged in two adjacent layers in the radial direction of the stator core, and the second welding structures are arranged in the same layer in the radial direction of the stator core. The multiple second welding structures are located in the same radial layer of the stator core.
2. The stator winding of claim 1, wherein: The first welding structure is provided on all layers except the layer where the second welding structure is located. The layer where the second welding structure is located is different from the layer where the first coil group is located. The lead end of any branch winding is connected to any second welding structure or any first welding structure.
3. The stator winding of claim 1, wherein: The stator core has an odd number of radial layers, which is greater than or equal to 3.
4. A stator winding according to any one of claims 1-3, characterized in that: The stator winding further includes a third coil group. Along the radial direction of the stator core, the third coil group is located on the side of the second coil group away from the first coil group, or the third coil group is located between the first coil group and the second coil group. The third coil group includes a plurality of second conductor groups arranged sequentially along the circumferential direction of the stator core. The two slots of the second conductor groups are located in two adjacent radial layers of the stator core.
5. A stator winding according to claim 4, characterised in that: The first conductor is either a first short-pitch conductor or a first long-pitch conductor; the pitch of the first short-pitch conductor is 5, and the pitch of the first long-pitch conductor is 7.
6. The stator winding of claim 4, wherein: The first conductor group includes a full-pitch conductor and a second short-pitch conductor, the full-pitch conductor surrounding the second short-pitch conductor; or, the first conductor group includes a second long-pitch conductor and a full-pitch conductor, the second long-pitch conductor surrounding the full-pitch conductor; the pitch of the full-pitch conductor is 6, the pitch of the second short-pitch conductor is 4, and the pitch of the second long-pitch conductor is 8.
7. The stator winding of claim 5, wherein: The second conductor group has the same structure as the first conductor group; or, the second conductor group includes two first short-pitch conductors, which are arranged in two adjacent slots along the circumferential direction of the stator core. Alternatively, the second conductor group may include two of the first long-pitch conductors, which are disposed in adjacent slots along the circumferential direction of the stator core.
8. A stator winding according to any of claims 1-3 and 5-7, characterized in that: The number of the first welded structures on one circumference of the stator core is greater than the number of the second welded structures on the other circumference of the stator core.
9. The stator winding according to claim 8, characterized in that: The first welding structure includes two first welding conductors, which are arranged in two adjacent slots along the circumferential direction of the stator core, and the pitch of the first welding conductors is 7 or 5.
10. The stator winding according to claim 9, characterized in that: The second welding structure includes two second welding conductors, which are arranged in two adjacent slots along the circumferential direction of the stator core, and the pitch of the second welding conductors is 6.
11. A stator characterized by: It includes a stator core and a stator winding as described in any one of claims 1-10, wherein the stator winding is disposed on the stator core.
12. An electric machine characterized by: Including the stator as described in claim 11.