Patent ID: 6831445
Filing Date: 2004-12-14
Classification: H02H,H02P

Abstract:
An automotive alternator comprising:a rotor equipped with a plurality of field magnetic poles; a first field winding working to magnetize said field magnetic poles; a second field winding working to magnetize said field magnetic poles, said second field winding having a time constant shorter than that of said first field winding; an armature subjected to a rotating field produced by said rotor to generate an alternating current output; a rectifier converting the alternating current output from said armature into a direct current output; a controller working to regulate field currents supplied to said first and second field windings to control an output voltage of the alternator; and a circulating circuit formed by a diode connected in parallel to said first and second field windings, said circulating circuit working to circulate the field currents in the event that supply of the field currents is cut by said controller.