US 12,149,135 B2
Electric motor stator and electric motor
Rongjian Bai, Tianjin (CN); and Yanhai Liu, Tianjin (CN)
Assigned to BorgWarner PowerDrive Systems (Tianjin) Co., Ltd., Tianjin (CN)
Appl. No. 17/635,387
Filed by BorgWarner PowerDrive Systems(Tianjin)Co., Ltd., Tianjin (CN)
PCT Filed Jan. 13, 2021, PCT No. PCT/CN2021/071594
§ 371(c)(1), (2) Date Feb. 15, 2022,
PCT Pub. No. WO2021/143740, PCT Pub. Date Jul. 22, 2021.
Claims priority of application No. 202010034942.7 (CN), filed on Jan. 14, 2020.
Prior Publication US 2023/0318380 A1, Oct. 5, 2023
Int. Cl. H02K 3/28 (2006.01); H02K 1/16 (2006.01); H02K 3/12 (2006.01)
CPC H02K 3/28 (2013.01) [H02K 1/165 (2013.01); H02K 3/12 (2013.01)] 13 Claims
OG exemplary drawing
 
1. An electric motor stator, comprising:
a stator core, being provided with a plurality of stator core slots, wherein the plurality of stator core slots are formed on a radial inner surface of the stator core and are separated by a preset slot distance in a circumferential direction of the stator core; and
a stator winding, mounted on the stator core, wherein
the stator winding is provided with Q pole pair coils, wherein Q/a number of slots per pole per phase=P, P being an integer; wherein the stator winding is a three-phase winding, and the number of slots per pole per phase is 3; and
the stator winding comprises a first coil set and a third coil set that are successively sleeved from outside to inside, wherein
the first coil set comprises a plurality of first segmented coil units, and any one of the plurality of first segmented coil units is provided with two hair-pin coils with different pitches;
the plurality of first segmented coil units of the first coil set are successively arranged at a same layer in the stator core slots in the circumferential direction of the stator core;
the third coil set comprises a plurality of third segmented coil units, and any one of the plurality of third segmented coil units is provided with hair-pin coils with a same pitch;
the plurality of third segmented coil units of the third coil set are successively arranged at a same layer in the stator core slots in the circumferential direction of the stator core; and
the pitches of the hair-pin coils in each first segmented coil unit are different from the pitches of the hair-pin coils in each third segmented coil unit;
the stator winding further comprises a second coil set disposed between the first coil set and the third coil set, wherein the second coil set comprises a plurality of second segmented coil units, any one of the plurality of second segmented coil units is provided with two hair-pin coils with different pitches, or, any one of the plurality of second segmented coil units is provided with hair-pin coils with a same pitch; and
the plurality of second segmented coil units of the second coil set are successively arranged at adjacent two layers in the stator core slots in the circumferential direction of the stator core;
each first segmented coil unit comprises one long-pitch hair-pin coil and two short-pitch hair-pin coils, or, each first segmented coil unit comprises two long-pitch hair-pin coils and one short-pitch hair-pin coil.