Patent ID: 8283819
Filing Date: 2012-10-09
Classification: H02K

Abstract:
1. An AC generator for a vehicle comprising: a case having an air suction hole formed therein; a shaft supported in the case so as to be freely rotatable; a rotor that is mounted in the case and has a pole core fixed to the shaft, a field winding mounted on the pole core, and a cooling fan fixed to at least one end in an axial direction of the pole core; a stator fixed to the case so as to surround the rotor; a rectifying device for rectifying AC electromotive force generated in the stator to DC; a voltage adjuster for adjusting the magnitude of an AC voltage generated in the stator; and a cooling member that is brought into contact with a circuit portion of the voltage adjuster to cool the circuit portion and has a base portion and plural fins projecting from the base portion in one direction so as to face the air suction hole formed in the case, wherein the cooling member comprises an assembly of a first cooling plate having the same cross-sectional surface in a generating and processing direction and at least a second cooling plate that has the same cross-sectional surface in a generating and processing direction and has the same cross-sectional surface shape as the first cooling plate, and the first cooling plate and the second cooling plate are abutted on each other so that the fin end surfaces of one cooling plate face ventilation paths formed by plural fins of the other cooling plate, wherein an opening end face of the air suction hole of the case is not overlapped with the abutting site between the first cooling plate and the second cooling plate of the cooing member in the axial direction.