Sensorless high-order super twisting sliding modes vector control for induction motor drives

This paper proposes a sensorless high-order super twisting sliding mode control method for induction motor speed servo systems. Based on the vector control principle, high-order super twisting sliding mode controllers in speed loop, current loop and flux loop are designed respectively. The super twisting sliding mode control is utilized to improve the response speed and robustness of motor control systems. Meanwhile, high-order sliding modes are adopted to eliminate the chattering phenomenon. For the demand of response speed in current loop, a control algorithm is proposed. The estimated rotor speed used in speed feedback loop is calculated by an adaptive observer. The simulation results prove clearly a good robustness against load torque disturbances, the estimated fluxes and the rotor speed converge to their real values. Our study is close to reality; all carried out simulations are based on real models simulated within the ATAB S P ES STE environment in continuous time.