A novel time varying dynamic modeling for hysteresis motor

Hysteresis motors are used in special applications such as gyroscope and gas centrifuge due to their unique features such as synchronism, self-starting, and developing smooth torque. dynamic modeling of hysteresis motors is essential to the prediction of the transient performance, the study of the dynamic stability, the development of modern closed-loop control, and the estimation strategies. this paper develops a new time varying dynamic model for a high-speed, circumferential- ux type hysteresis motor, in which the parameters of equivalent circuit of rotor's material are adjusted based on operational b-h loop. for this purpose and based on the elliptical assumption about b - h loops, the hysteresis lag angle,β , is updated due to the applied stator voltage and available load torque. developed mathematical model satis es many theoretical aspects of hysteresis motor behavior in transient and steady-state situations. the model o ers a tool to study the start-up of hysteresis motor, the change of stator voltage, the variation of load torque, the frequency tracking of variable-speed applications, and transient-state response to design parameters. some simulations are provided to demonstrate the validity of developed model in matlab/simulink and are veri ed by some experimental results. the proposed results verify the advantages of this model over previous research works.