Full adaptive backstepping design of a speed sensorless field oriented controller for an induction motor

Abstract

It is well known that modern induction motor control relies on a good dynamic model of the motor. Full state variable information together with exact parameter knowledge is needed. The aim of this work is to fulfil these needs by use of a novel nonlinear observer structure based on the backstepping principle. A full proof for convergence of states is presented together with a stability proof for the parameter estimates. When the system is persistently excited, simulations and experiments show convergence of the parameters. The observer is used in a rotor field oriented control strategy and verified by experiments.