Sliding mode control of vector controlled induction motor drive

This paper presents the speed control of the induction motor drive. The control strategy is based on the sliding mode technique. The decoupling between motor speed and rotor flux amplitude has been achieved using the field orientation principle. The control law has been designed such that the uncertainty due to motor parameters variation can be eliminated. Also, the chattering problem associated with classical sliding mode control has been solved by suggesting an adaptive load torque disturbance estimator. Digital simulations have been carried out in order to evaluate the effectiveness of the proposed scheme. The induction motor with the proposed controller has been tested through mismatched rotor resistance, and load torque disturbance. The results prove that the induction motor with the proposed controller has good robustness in face of uncertainties including load disturbance. Moreover, accurate tracking performance has been achieved.