Different viable torque control schemes of induction motor for electric propulsion systems

This work presents a detailed comparison between various control strategies, emphasizing advantages and disadvantages. The scope of This work is to choose an adaptive induction motor drive for an electric propulsion system. Recent advances in induction motor control have made it suitable for fast dynamic response applications. In this paper, the performance of the various control schemes such as indirect field oriented control (IFOC), direct field oriented control (DFOC), direct torque control (DTC) and neuro-fuzzy DTC (DTNFC) are evaluated. The analysis has been carried out on the basis of the results obtained by numerical simulations. A new estimator is also designed to estimate the stator resistance of induction motor. The sensitivity of DTC to temperature variations, leading to stator resistance changes, is eliminated by online estimation of stator resistance. In this paper, detailed analysis and investigation are carried out and an adaptive control is proposed for electric propulsion system.