Patent ID: 6426580
Filing Date: 2002-07-30
Classification: H02K

Abstract:
A vehicular AC generator, comprising:a rotor supported by a rotating shaft and a stator arranged on an outer periphery of said rotor, said stator having stator coil ends; a pair of cores included in said rotor and supported by said rotating shaft, and having a plurality of trapezoidal-shaped claws as magnetic poles protruding on the outer peripheral edges of said pair of cores and alternately arranged in such a way that each of said claws coupled to one of said pair of cores is arranged in a concave portion between adjacent said claws coupled to the other of said pair of cores; a pair of fans attached to the front side and the rear side of said cores, at least one of said fans having an outer surface forming an outer diameter in the range between 85% and 96% of the outer diameter of each of said cores; and a side plate fixed to an end portion of a blade of at least one of said pair of fans, said side plate having an outer diameter equal to or smaller than the outer diameter of said at least one of said pair of fans; each of said claws having a tapered portion for gradually decreasing the outer diameter of a shoulder portion of said claw in the direction toward an end surface of said core so that the outer diameter of at least one of said cores faced to said at least one of said fans becomes substantially the same as the outer diameter of said at least one of said fans and a gap is formed between said at least one of said fans and a corresponding one of said stator coil ends along a corresponding one of said tapered portions.