Patent ID: 6710496
Filing Date: 2004-03-23
Classification: H02K

Abstract:
A stator for an alternator comprising:a stator core fixed to a case and facing a rotor, and formed in a circumferential direction with a number of radially extending slots of a rectangular cross section; and a stator coil installed in said slots of said stator core, wherein said stator coil is formed into a predetermined shape prior to installation in said slots; and said stator coil comprising wire-shaped conductors wound so as to alternately occupy an inner layer and an outer layer in a slot depth direction within said slots at intervals of a predetermined number of slots, said conductors comprising: straight portions disposed within said slots of said stator core, a plurality of turn portions being bent back outside said slots at axial end surfaces of said stator core, said plurality of turn portions being bent back in a similar shape inclined with respect to an outer circumferential surface of the stator core and so as to align in rows in a circumferential direction and form coil end groups, and; end portions being bent outside said slots at an axial end surfaces of said stator core, said end portions comprising a portion that is inclined with respect to an outer circumferential surface of the stator core and so as to align in rows in a circumferential direction and form coil end groups, wherein a cross-section of at least a principal portion of said straight portion of said stator coil inside said slots is approximately rectangular, a cross-section of at least a portion including said plurality of turn portions and said end portions of said coil is approximately circular or approximately elliptic, a cross-sectional area of said approximately rectangular cross-sectional portion differs from that of said approximately circular cross-sectional portion or said approximately elliptic cross-sectional portion.