Patent ID: 6946759

Claim:
A staror for an automotive alternator including a rotor, which has claw-shaped magnetic poles fitted on a rotating shaft and fans, and said stator, which is disposed around the outer circumference of said rotor, has a coil wound there around and conaected into three-phase alternating-current connections, and is ventilated and cooled by said fans, wherein, said stator includes a stator core in which a plurality of slots are formed and a stator winding wound around said stator core, said stator winding being composed of a plurality of electric conductors jointed to each other, said electric conductors include a plurality of winding sub-portions in each of which one long strand of wire is bent back outside said slots at end surfaces of said staror core and wound into a wave winding so as to alternately occupy an inner layer and an outer layer in a slot depth direction within said slots a predetermined number of slots apart, and the turned portions of said strands of wire bent back outside said slots at both the end surfaces of said stator core are disposed in a circumferential direction so as to constitute a joint-side coil end and a turn-side coil end, and said winding sub-portions are connected to each other on said joint-side coil end at a first end of said stator core, wherein: wherein the average amount of application per unit area of the varnish, with which said joint-side coil end is impregnated, is larger than the average amount of application per unit area of the varnish, with which said turn-side coil end is impregnated, wherein said turn-side coil end is impregnated with no varnish.