Full-order terminal sliding-mode observer for induction motor speed servo systems

This paper proposes a novel observer for induction motor speed servo systems by utilizing full-order sliding-mode control. A full-order terminal sliding-mode manifold is designed for the observer, and the related control laws guarantee the strong robustness of the observer to internal parameter variations and external disturbances. The chattering and singular phenomenon existed in conventional sliding-mode control systems are eliminated. Continuous control signals of the observer can be directly used for the estimation algorithms for the speed and rotor flux. The proposed observer can be utilized to implement the sensorless control of induction motors. The simulations validate the proposed method.