US 12,334,787 B2
Stator for rotary electric machine
Yoichi Miyoshi, Kariya (JP); and Toshio Sugiyama, Kariya (JP)
Assigned to AISIN CORPORATION, Kariya (JP)
Appl. No. 17/908,294
Filed by AISIN CORPORATION, Aichi (JP)
PCT Filed Mar. 30, 2021, PCT No. PCT/JP2021/013714
§ 371(c)(1), (2) Date Aug. 31, 2022,
PCT Pub. No. WO2021/240989, PCT Pub. Date Dec. 2, 2021.
Claims priority of application No. 2020-091786 (JP), filed on May 26, 2020; and application No. 2021-014310 (JP), filed on Feb. 1, 2021.
Prior Publication US 2023/0093998 A1, Mar. 30, 2023
Int. Cl. H02K 3/28 (2006.01)
CPC H02K 3/28 (2013.01) 5 Claims
OG exemplary drawing
 
1. A stator for a rotary electric machine, the stator comprising:
a stator core having a plurality of slots; and
a multi-phase stator coil wound around the stator core by double-layer winding, wherein
the multi-phase stator coil is formed by winding a plurality of double-wound coils around an entire circumference of the stator core for each phase, each of the double-wound coils being wound concentrically with different circumferential lengths,
each of the double-wound coils is formed of a coil portion having a larger circumferential length and a coil portion having a smaller circumferential length,
in one of the double-wound coils, a total number of coil pieces inserted into the plurality of slots for the coil portion having the larger circumferential length and a total number of coil pieces inserted into the plurality of slots for the coil portion having the smaller circumferential length are equal to each other, and
in each pair of the double-wound coils adjacent to each other in a circumferential direction, coil portions having a same circumferential length are inserted into a same slot of the plurality of slots.