Backstepping observer validation for sensorless induction motor on low frequencies benchmark

This paper presents a backstepping observer to reconstruct the angular speed of induction motor and an estimator of fluxes and load torque. Due to the complexity of observation at low frequencies, both the observer and the estimator are tested and validated on the reference trajectories of a new sensorless induction motor benchmark particularly in the well known case where the motor state could be un-observable.