Patent ID: 7843107

Claim:
A dynamoelectric machine comprising: a rotor comprising: a pole core comprising: a boss portion; a pair of yoke portions that are disposed so as to extend radially outward from two axial end edge portions of said boss portion; and a plurality of claw-shaped magnetic pole portions that are disposed so as to extend in an axial direction alternately from each of said pair of yoke portions, and that are arranged circumferentially so as to intermesh with each other, said pole core being fixed to a shaft that is inserted through a central axial position of said boss portion; and a field coil that is housed inside a space that is surrounded by said boss portion, said pair of yoke portions, and said plurality of claw-shaped magnetic pole portions; a stator that is disposed so as to surround said rotor with a predetermined air gap interposed; and a plurality of permanent magnets that are held near said pair of yoke portions so as to face an inner circumferential surface of a tip end portion of each of said plurality of claw-shaped magnetic pole portions, each of said plurality of permanent magnets being magnetically oriented in a reverse direction to an orientation of a magnetic field that said field coil produces.