Patent ID: 6894414

Claim:
An alternator comprising: a rotor for forming north-seeking (N) and south-seeking (S) poles alternately about a rotational circumference; and a stator comprising: a stator core surrounding said rotor; and a polyphase stator winding installed in said stator core, said stator core being formed with a number of slots extending axially at a predetermined pitch in a circumferential direction, said polyphase stator winding comprising a number of winding portions, wherein each winding portion comprises a long strand of wire 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 strands of wire folding back outside said slots at both axial end surfaces of said stator core, and said stator core being provided with an abutting portion extending axially such that said stator core becomes an annular shape by joining ends of said stator core at said abutting portion.