High-order terminal sliding modes control for induction motor

This paper proposes a high-order nonsingular terminal sliding mode control method for induction motor velocity servo systems. Based on the vector control principle, high-order nonsingular terminal sliding mode controllers in velocity loop, current loop and flux loop are designed respectively. The nonsingular terminal 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, an exponential control law is proposed. The simulation results show that the proposed method has advantage over conventional PI control methods in response speed, control precision, and robustness.