Improved Starting Performance of Wound-Rotor Motors Using Saturistors

This paper describes a new form of polyphase induction motor, the series hysteresis motor, which derives most of its accelerating torque from the hysteresis losses produced in a hard magnetic material, located in flux paths linked by the secondry currents of the motor. The resulting torque curve is remarkably flat, and the torque per ampere unusually high (Fig. 13).