Patent ID: 6469408
Filing Date: 2002-10-22
Classification: H02K

Abstract:
An automotive alternator comprising:a rotor comprising a plurality of claw-shaped magnetic poles, wherein cut-out portions of a rectilinear or curvilinear cross-sectional shape are provided in shoulder portions of said claw-shaped magnetic poles; a stator comprising a stator core disposed facing said rotor, and a polyphase stator winding installed in said stator core; and a bracket housing and supporting said rotor and said stator; said stator core 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 in which long wire strands are 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 wire strands folding back outside said slots at axial end surfaces of said stator core to form turn portions, and a plurality of said wire strands lining up in a row in a radial direction inside said slots of said stator core, said turn portions of said wire strands being roughly the same shape and aligning at roughly the same pitch in a circumferential direction to constitute coil end groups, said coil end groups disposed in a plurality of rows in a radial direction, a fan provided at an axial end of said claw-shaped magnetic poles of said rotor roughly facing said coil end group and generating cooling air flowing in a radial direction to ventilate said coil end group, wherein said fan is provided with blade surfaces which are inclined with respect to an axial direction toward said cut-out portions of said claw-shaped magnetic poles.