Patent ID: 6291921
Filing Date: 2001-09-18
Classification: H02K

Abstract:
An automotive alternator comprising:a stator having a stator core provided with slots formed by a number of teeth spaced circumferentially and extending radially inwards, and a polyphase stator coil installed in said slots; anda rotor disposed inside said stator, said rotor having a field coil for generating magnetic flux on passage of electric current, and a pole core covering said field coil and facing said teeth, a number of claw-shaped magnetic poles being formed in said pole core by said magnetic flux,a flat surface portion extending substantially parallel to a shaft, said shaft being secured to said pole core, and said flat surface portion being formed in a root portion of a claw-shaped magnetic pole such that when an end portion of one of the stator teeth spread in a circumferential direction is positioned between adjacent claw-shaped magnetic poles, there is clearance between said end portion of said tooth and at least one of said claw-shaped magnetic poles when viewed from a radial direction.