Patent ID: 6809443
Filing Date: 2004-10-26
Classification: H02K

Abstract:
An alternator for an automotive vehicle, comprising:a rotor; a stator disposed in an opposed relationship with said rotor; a frame supporting said rotor and said stator; a rectifying device for converting alternating-current output of said stator into direct-current output; and a cooling fan for introducing cooling air from an outside via said rectifying device, wherein said rectifying device is disposed inside said alternator and comprises a small-diameter fin and a large-diameter fin having mutually different polarities and each serving as a cooling member as well as an electric conductive member for a plurality of rectifying elements fixed in receiving holes of respective fins, and a terminal base forming a rectifying circuit of said rectifying elements, said small-diameter fin and said large-diameter fin, each extending in a direction normal to an axial direction of said rotor, are disposed at both sides of said terminal base so as to be overlapped in the axial direction of said rotor, and said small-diameter fin is disposed far from said rotor compared with said large-diameter fin, and said small-diameter fin is provided with a plurality of independent ribs each protruding in the axial direction of said rotor and extending in a radial direction of said rotor from or along an opening periphery of said receiving hole of said rectifying element.