Patent ID: 7012351

Claim:
An alternator comprising: a stator having: a stator core comprising a plurality of teeth defining a plurality of slots extending in an axial direction so as to line up in a circumferential direction on an inner peripheral wall surface; and a stator winding configured such that conducting wires are installed in said slots; and a rotor rotatably disposed inside said stator, said rotor having: a field winding in which a magnetic flux arises on passage of an electric current; a pair of pole cores each having a plurality of claw-shaped magnetic poles that alternatively intermesh with each other disposed so as to cover said field winding; and a fan disposed on an axial end surface of at least one of said pole cores, air flowing together with rotation of said rotor in stepped portions between said teeth partitioning said slots, wherein: at least one of said teeth includes an inclined portion which is inclined in a circumferential direction with respect to a longitudinal axis of said teeth on at least one end portion among first and second axial end portions of said at least one of said teeth.