A New Control Scheme for Compensating the Torque Transfer Function of a Self-Controlled Synchronous Motor

A control scheme is presented for compensating the torque transfer function of a self-controlled synchronous motor without damper windings. In effect, the armature current phase and amplitude are altered during transients to compensate for the slow response of the field current. The system also is arranged to come to unity power factor in the steady state which requires that the field current be adjusted to each specific load point by the controller. The validity of the control scheme is verified by the experiments.