Patent ID: 6531849
Filing Date: 2003-03-11
Classification: H02K,H02P

Abstract:
An alternator for a vehicle having a pulley driven by an engine crankshaft through a belt, a rotor being connected to the pulley, a stator located opposite to the rotor, a ventilating means rotating as one body with the rotor, and a frame with a plurality of cooling air vents as the ventilating means, the frame holding the rotor and the stator, comprising:the pulley mounted on a rotatable shaft of the rotor by a one-way clutch that transmits driving power to the rotor during acceleration of the crankshaft and does not transmit driving power to the rotor during deceleration of the crankshaft; and the rotor having a plurality of magnetic poles surrounding a field coil, an alternator control mechanism supplying a predetermined exciting current to the field coil upon sensing engine stop.