Patent ID: 8053939

Claim:
A brushless AC generator for a vehicle comprising: a front side bracket and a rear side bracket for holding a shaft through bearings; a stator core having a stator coil held between the brackets; a rotor assembled body formed into the shape of a cylinder from a first rotor pole having plural claw poles in a circumferential direction at even intervals and a second rotor pole having plural claw poles provided between the former plural claw poles in a circumferential direction at even intervals, the first and second rotor poles being united into one body, the rotor assembled body being fixed to the shaft so that the first rotor pole is faced to the front side bracket; a cylindrical excitation core provided in the rotor assembled body and fixed to an inner surface of the rear side bracket; an excitation coil wound around the excitation core; an external fan fixed to a shaft outside the front side bracket; and an internal fan fixed on a side faced to the front side bracket of the first rotor pole to the rotor assembled body, the internal fan having a fan blade provided in a valley part between the claw poles of the first rotor pole, wherein, interaction of the external fan with the internal fan is achieved to generate an air flow passing from the rear side bracket to the front side bracket in the same direction and the airflow is used for cooling at least the stator core, the rotor assembled body, the excitation core and the excitation coil.