Nonlinear adaptive control of induction motor with sliding mode flux observer

This paper investigates a nonlinear adaptive controller (NAC) with sliding mode flux observer (SMFO) for induction motor (IM), which mainly deal with the unknown time-varying nonlinearities and disturbances. In the NAC design, all nonlinearities are assumed unknown, and included in a perturbation term, together with uncertainties and disturbances. The perturbation term is estimated by an extended-state observer (ESO) and the online estimate of the perturbation is used to achieve adaptive linearization. Moreover, a SMFO is employed to estimate the rotor flux. The proposed control method provides a satisfactory speed tracking performance in the presence of parameter variations and load torque disturbance. The performance of the proposed controller is verified by simulation studies and experiments.