Speed sensorless indirect field-oriented of induction motor using two type of adaptive observer

In this paper, the indirect vector control speed sensorless is presented, two adaptive mechanisms have been proposed to estimate the rotor speed. The first adaptive observer based on sliding mode, a study was made to present the steps needed to design a sliding mode observer. The second has been developed from the backstepping technique to design an observer for the rotor speed. Finally, tests show the robust performance of the control law obtained by these two types of adaptive observers.