Analytic synthesis of a hysteresis motor

This paper presents the unique synthesis of a motor with a hysteresis torque–speed characteristic. The machine is synthesized from a conventional polyphase squirrel cage induction motor (SCIM) with a high rotor resistance to leakage reactance r2/x2 ratio, which is mechanically coupled to a polyphase transfer field (TF) machine but with an inversion of the usual torque–speed characteristic of the latter about the speed axis and both machines are connected in parallel to the supply. It is shown that the resultant torque of the combined machines is constant, from standstill to full speed ω0, typical of that of a hysteresis motor. Unlike the conventional hysteresis motor, the output torque of the synthesized version can be made large.