Observer-based fault tolerant controller design for Induction Motor drive in EV

This paper deals with the problem of fault tolerant tracking controller (FTTC) design for Induction Motor (IM) drive in electric vehicle (EV) with optimal performance. First, the Takagi-Sugeno (T-S) model representation was adopted to approximate the nonlinear dynamic of IM subject to speed sensor faults and unknown bounded disturbance. Next based on robust H_∞ fault detection observer design a Modified Field Oriented Controller (MFOC) is designed. This scheme requires the knowledge of the occurring faults which are estimated from a descriptor observer. The observer gains were determined by solving a set of Linear Matrix Inequality (LMI). Finally, simulation results are given to demonstrate the controller´s effectiveness evaluated on 7.5kw Induction Motor.