Patent ID: 8400028

Claim:
A brushless rotary electric machine, comprising: a case comprising a pair of a first bracket and a second bracket, which are opposed to each other; a stator fixed to the case; a shaft having two ends rotatably supported respectively by the first bracket and the second bracket through an intermediation of bearings; a rotor provided to the shaft; and a cooling fan fixed to the shaft, wherein: the rotor comprises: magnetic-pole cores fixed to the shaft; a cylindrical exciting core fixed to the first bracket, the exciting core being inserted into one of the magnetic-pole cores; and an exciting coil formed by winding a conductor around a minor-diameter portion of the exciting core; and the first bracket comprises: vent holes for the rotor, through which cooling air generated by rotation of the cooling fan passes, the vent holes for the rotor being formed around a bearing housing portion for housing the bearing therein; and a guiding portion comprising an air duct for guiding the cooling air, which has passed through the vent holes for the rotor, to the exciting core; and the first bracket comprises cooling fins which divide each of the vent holes for the rotor into a plurality of vent hole portions for the rotor.