Patent ID: 6504283
Filing Date: 2003-01-07
Classification: H02K

Abstract:
An alternator comprising:a stator having an annular stator core provided with a number of slots extending axially and disposed in lines circumferentially so as to open on an inner circumferential side of said stator core and a stator coil wound on said stator core so as to be installed in said slots; a rotor having a number of claw-shaped magnetic poles for alternately forming north and south poles about a rotational circumference, said rotor being rotatably disposed on said inner circumferential side of said stator core; a bracket supporting said rotor and said stator; and a rectifier disposed at a first axial end of said stator and connected to end portions of said stator coil, said rectifier converting alternating current from said stator coil into direct current, wherein the number of said slots is two per phase per pole; and said stator coil comprises a number of winding sub-portions, each winding sub-portion formed from a long strand of wire having a length of two pole pitches or more wound so as to alternately occupy an inner layer and an outer layer of said slots in a slot depth direction within said slots at intervals of a predetermined number of slots by folding said strand of wire outside said slots at axial end surfaces of said stator core, wherein said stator coil is constructed by placing two three-phase coils so as to have a mutual phase difference, said three-phase coils being formed by connecting said winding sub-portions; and a pitch between circumferential air-gap centers of adjacent slot opening portions is formed so as to be nonuniform.