US 12,113,414 B2
Stator coil and rotating electric machine stator
Yohei Ito, Tokyo (JP); and Sohei Samejima, Tokyo (JP)
Assigned to MITSUBISHI ELECTRIC CORPORATION, Tokyo (JP)
Appl. No. 17/913,880
Filed by Mitsubishi Electric Corporation, Tokyo (JP)
PCT Filed Apr. 27, 2020, PCT No. PCT/JP2020/017891
§ 371(c)(1), (2) Date Sep. 23, 2022,
PCT Pub. No. WO2021/220322, PCT Pub. Date Nov. 4, 2021.
Prior Publication US 2023/0117799 A1, Apr. 20, 2023
Int. Cl. H02K 3/28 (2006.01)
CPC H02K 3/28 (2013.01) 20 Claims
OG exemplary drawing
 
1. A stator coil to be mounted to a rotating electric machine stator core including an annular yoke portion, a plurality of tooth portions protruding inward in a radial direction from an inner circumferential surface of the yoke portion and arranged at regular intervals in a circumferential direction, and a plurality of slots formed between the tooth portions adjacent to each other, the stator coil comprising a plurality of coil conductors, wherein
a thickness in the radial direction at a coil end portion of each coil conductor provided on at least one end surface side in an axial direction of the stator core is equal to a thickness in the radial direction of a slot insert portion of the coil conductor to be inserted into the slot of the stator core,
a width in the circumferential direction of each coil conductor at an end in the circumferential direction of the coil end portion is greater than a width in the circumferential direction of the coil conductor at the slot insert portion,
the coil conductors include two kinds of coil conductors:
a first coil conductor including a plurality of the slot insert portions to be inserted into the slots of the stator core that are away from each other by a predetermined number of slots, and a plurality of the coil end portions continuously connecting ends in the axial direction of the slot insert portions alternately on one end side and another end side in the axial direction of the stator core; and
a second coil conductor including a plurality of the slot insert portions to be inserted into the slots of the stator core that are away from each other by a predetermined number of slots, and a plurality of the coil end portions continuously connecting ends in the axial direction of the slot insert portions alternately on one end side and another end side in the axial direction of the stator core,
the first coil conductor and the second coil conductor are stacked in the radial direction, to form a stacked coil conductor, and
a center part in the circumferential direction of the coil end portion of the first coil conductor and a center part in the circumferential direction of the coil end portion of the second coil conductor overlap each other as seen in the radial direction.