Synthesis of Hysteresis Motor

This work presents the synthesis of a motor with hysteresis motor torque-speed characteristic. The machine is synthesized from a conventional squirrel cage induction motor (SCIM) with high rotor resistance to leakage reactance ratio and a polyphase transfer field (TF) reluctance effect machine with an inverted torque-speed characteristics about the speed axis. Both motors are mechanically coupled and are connected in parallel to the supply. It is shown that the resultant torque which is the summation of the torques of the two component machines is approximately constant from standstill to synchronous speed ?o, typical of hysteresis motor. Unlike the conventional hysteresis motor, the output torque of the synthesized version is much higher than the former.