Patent ID: 6433456
Filing Date: 2002-08-13
Classification: H02K

Abstract:
An automotive alternator comprising:a stator having a stator core, a plurality of slots open on an inner peripheral side of said core and extending in an axial direction, and two or more sets of stator coils incorporated in the slots, each of said slots being defined by a narrow tooth and a wide tooth next to each other extending in the axial direction; and a rotor having a rotor coil rotatably provided inside the stator to generate magnetic flux and a pole core which covers the coil and has a plurality of claw-shaped magnetic poles, the number of slots is nP Ã¸, where n is the number of sets of stator coils, P is the number of rotor poles, and Ã¸ is the number of phases of each set of stator coils, the stator coils being disposed such that two sets of three-phase coils have a phase difference from each other, and distances between adjacent centerlines extending in a radial direction of slot openings of the slots being nonuniform, wherein the claw-shaped magnetic poles of the rotor are formed such that there is a time at which the narrow tooth formed between the slots of the opposing stator is positioned to overlap two of the claw-shaped magnetic poles that are adjacent in a direction of rotation of the rotor and have opposite polarities as one of the magnetic poles moves past the narrow tooth and the next magnetic pole arrives.