Patent ID: 6841913
Filing Date: 2005-01-11
Classification: H02K,Y10T

Abstract:
1. A stator coil including sequentially-connected conductor segments for an electric rotary machine, comprising: a plurality of conductor segments accommodated in a slot of a stator core having an even number of conductor accommodation positions serially aligned in the radial direction, said conductor segments being sequentially connected to cooperatively constitute one turn of a phase coil of an M-phase (M is an integer not smaller than 3) armature coil, each of said conductor segments having a pair of in-slot conductor portions separately accommodated into the conductor accommodation positions of two different slots mutually spaced by substantially one pole pitch, a head conductor 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, said head conductor portion having a U-shaped head top portion, and a pair of head slanting portions extending obliquely in both circumferential and axial directions from said head top portion and respectively connected to said in-slot conductor portions, said tail conductor portions having a pair of tail slanting portions extending obliquely in both circumferential and axial directions from said pair of in-slot conductor portions, and tail joint portions formed at distal ends of said tail slanting portions and bonded to tail conductor portions of other conductor segment, said head side coil end including a plurality of said head conductor portions serially disposed in the radial direction when seen from the circumferential direction, and said tail side coil end including a plurality of said tail conductor portions serially disposed in the radial direction when seen from the circumferential direction, wherein said tail side coil end includes a plurality of said tail joint portions disposed serially in the radial direction with predetermined gaps, and a radial gap between adjacent tail slanting portions disposed in the radial direction is widened in the vicinity of said tail joint portions compared with a radial gap in the vicinity of an end surface of said stator core.