Patent ID: 6448687
Filing Date: 2002-09-10
Classification: H02K

Abstract:
An automotive alternator including,a case having a plurality of air intake vents disposed in the axial surface thereof and a plurality of air discharge vents disposed in the radial surface thereof, a rotor having a pair of pole cores including claw-shaped magnetic poles projecting radially externally from the outer circumferential perimeters thereof at even pitch, respectively, fastened to a shaft such that said claw-shaped magnetic poles intermesh and rotatably disposed in said case, said pair of pole cores having a pair of fans, which include a plurality of blades around the outer circumferences thereof, and being fastened to the axial end surfaces thereof; and a stator fastened to said case so as to cover the outer circumference of said rotor, and having a stator core including a plurality of slots formed around the inner circumference thereof facing said rotor and a stator winding accommodated in said slots, wherein: said slots are formed in an even number, said claw-shaped magnetic poles of each pole core are formed in an even number, and said blades of said pair of fans are formed in the same odd number, respectively.