Patent ID: 11146134

Abstract:
To cool field winding from its inner peripheral side and increase an insulation performance, salient-pole rotor (3) has rotor yoke (12) provided along rotation shaft (11), magnetic cores (13) protruding outward in radial direction from outer peripheral portion of rotor yoke (12) and arranged at regular intervals in circumferential direction, magnetic head (14) provided at radial direction outer side of magnetic core (13), and field winding (15) wound around outer peripheral surface of magnetic core (13) between rotor yoke (12) and magnetic head (14). And, insulating structure of ventilation path of salient-pole rotor (3) has ventilation groove (15a) opening to inner peripheral surface of field winding (15) and penetrating field winding (15) in radial direction, ventilation hole (14a) penetrating magnetic head (14) in radial direction and communicating with ventilation groove (15a), and stepped portion (15b) formed at portion, at magnetic head (14) side, of ventilation groove (15a).