Robust fuzzy sliding mode observer for sensorless field oriented control of induction motor

This paper deals with the sensorless field oriented control based on Takagi Sugeno (TS) observer. In the proposed algorithm, we present a nonlinear induction machine by Takagi-Sugeno (T-S) fuzzy model which is valid in large speed domain instead of linearized model around equilibrium point. In addition we design sliding mode observer known for its robustness against parametric uncertainties and external perturbations. The design conditions of the fuzzy sliding mode observer are formulated by LMI (linear matrix inequalities) terms. Then implemented in DSP-TMS320F240, a control tool, the simulation and experimental results given by the combination of the observer and the establish sensorless with field oriented control (FOC), demonstrate good performance of the proposed observer on open loop and closed loop.