ROTATING ELECTRICAL MACHINE

Rotating electric machine comprising a main electric machine, an excitation machine whose rotor is adapted to rotate with a rotor of the main electric machine and produce magnetizing power to the main electric machine, and a controllable rectifier bridge (3) electrically connected to the excitation machine for feeding a field magnetization current (IR) to a rotor winding (4) of the main electric machine and comprising controllable semiconductor components (TH1 to TH6) for controlling the field magnetization current (IR). The rotating electric machine comprises a controllable circuit connected in parallel with the rotor winding (4) and adapted to lower the magnetization of said rotor winding (4). The controllable circuit is a self-controlled circuit (6) configured to self-act depending on the voltage (V4) across said rotor winding (4) and comprises a discharge resistor dissipating the field magnetization current (IR) to lower the magnetization of said rotor winding (4).