DYNAMO-ELECTRIC MACHINE

摘要

A dynamo-electric machine (11) is provided with: a stator (12) which has a circular cylindrical inner hole; and a rotor (13) which has a rotating shaft (17) concentric with the inner hole of the stator (12) and which also has an outer peripheral surface facing the inner peripheral surface of the inner hole with a predetermined gap therebetween. A rotor core (18) which is provided around the rotating shaft (17) is divided in the axial direction of the rotor core (18) into rotor cores. Air passage holes (19) are formed in the divided rotor cores (18) so as to be arranged around the rotating shaft (17) and so as to penetrate through the divided rotor cores (18) in the axial direction thereof. Spacers (22) are provided between the end surfaces of the divided rotor cores, and a duct (23) which leads from the air passage holes (19) to the gap between the inner peripheral surface of the inner hole of the stator and the outer peripheral surface of the rotor is formed between the end surfaces.