Robust induction motor control for electric vehicles

An induction motor is one of the suitable motors for the electric vehicles. The induction motor used in the electric vehicles has been generally controlled based on the vector control method to obtain good dynamic torque response. A new discrete-time control algorithm has been developed by combining variable structure system (VSS) and Lyapunov design. It possesses all the good properties of the sliding mode control and avoids the unnecessary discontinuity of the control input, thus eliminating chattering which has been considered as a serious obstacle for applications of VSS. A unified control approach for the stator currents and torque control based on the discrete-time sliding mode for application in indirect vector control for an IM drive is developed. The validity of the algorithm was verified by simulation and experiment.