Patent ID: 7723876
Filing Date: 2010-05-25
Classification: H02K

Abstract:
1. An automotive alternator comprising: a rotor that is fixed to a rotating shaft; a case that rotatably supports said rotating shaft and that envelops said rotor; a stator comprising: a rectifier comprising: a cooling fan that is fixed to said first end surface of said rotor, said automotive alternator being characterized in that: an air intake aperture is disposed through said case so as to face said negative-side heatsink, and an air discharge aperature is disposed through said case so as to be positioned radially outside said cooling fan; a plurality of radiating fins are disposed so as to project from a rear surface of said positive-side base portion of said positive-side heatsink; and said positive-side heatsink is disposed such that said plurality of radiating fins are positioned radially outside said cooling fan, and a cooling airflow that flows out from said cooling fan passes through said plurality of radiating fins.