Patent ID: 6995492

Claim:
An electric rotary machine equipped with a stator coil including sequentially-connected conductor segments, comprising: a rotor having P pairs of magnetic poles; a stator core with a plurality of slots, each slot having a plurality of conductor accommodation positions sequentially aligned in a radial direction; M-phase windings, where M is an odd number not less than 3, each phase winding being constituted by sequentially connecting a plurality of U-shaped conductor segments; said conductor segment comprising a pair of in-slot conductor portions separately accommodated into two different slots mutually spaced by a predetermined slot pitch, a U-shaped head portion continuously extending from said in-slot conductor portions and protruding from one end of said stator core so as to constitute a head side coil end, and a pair of tail conductor portions continuously extending from said in-slot conductor portions and protruding from the other end of said stator so as to constitute a tail side coil end; and said pair of tail conductor portions having distal ends being bonded to distal ends of tail conductor portions of other conductor segment, wherein K inphase slots arranged successively in a circumferential direction cooperatively constitute an inphase slot group, each inphase slot accommodating the in-slot conductor portions constituting the same phase winding, where K is a natural number not smaller than 2, said slot comprises S conductor accommodation position sets, each conductor accommodation position set including 1st-layer to 4th-layer conductor accommodation positions being numbered from a radially inner side and sequentially aligned in a radial direction, and said phase winding comprises C(=S/T) parallel coils connected in parallel to each other, each parallel coil including T (T is a natural number including 1) layer coils connected in series and selected from S layer coils accommodated in respective conductor accommodation position sets, said S layer coils being accommodated in respective conductor accommodation position sets and constituted by serially connecting K partial coils accommodated in said inphase slots arranged successively in the circumferential direction and accommodated in the same conductor accommodation position set.