Gain margin technique based continuous sliding-mode control of induction motors

This paper proposes a gain margin technique based continuous sliding-mode control method for position servo systems of induction motors. A systematic design method for position and current controllers is developed to implement the robust control of induction motors in the field orientation control system. In the proposed controllers design, the boundaries of disturbances and parameter perturbations in the control system can be determined in advance based on the upper-bounds of uncertainties in the induction motor model. The gain margin technique is utilized to regulate the gain of the switching control. The chattering phenomenon are attenuated by using a continuous sliding-mode control method, so continuous control signals can be generated and directly applied in servo systems of induction motors. The simulation results show that the proposed method can implement high-performance position control of induction motors with improvement of steady-state and dynamic performances, control precision and robustness.