Patent ID: 8004130

Claim:
A rotating electric machine comprising: a power unit provided with a switching element that controls an electric current that flows in a stator winding provided in a stator; a magnetic-field current control circuit unit provided with a switching element that controls an electric current that flows in a rotor winding provided in a rotor; and a rotation sensor unit comprising: a sensor rotor fixed on a rotor shaft that supports the rotor; a sensor stator that faces the sensor rotor by the intermediary of a gap; and a sensor winding provided on the sensor stator, the rotation sensor unit outputting from the sensor winding an output in accordance with a rotation position of the sensor rotor, wherein the power unit and the magnetic-field current control circuit unit are arranged on a predetermined surface of one of a pair of brackets that pivotably support the rotor shaft, and the rotation sensor unit is disposed in the vicinity of the predetermined surface of the one bracket; and wherein there is provided a ring-shaped member that is fixed on the outer surface of the sensor stator and configured with a non-magnetic unit having an electric conductivity and a magnetic unit.