Backstepping control for an induction motor with an adaptive Backstepping rotor flux observer

This paper deals with the synthesis of a stabilizing Backstepping nonlinear control provided with an adaptive Backstepping observer to estimate the rotor flux of an Induction Machine (IM). This approach is based on the vector control strategy by replacing the existing conventional controller with a Backstepping control in order to more quickly bring back the q-axis flux towards zero and to reduce the effect of the motor parameters variations. To observe the rotor flux, we have introduced an observer based on the Backstepping theory provided with an adaptive mechanism of rotor resistance. The design principle of the controlled system is established using the Lyapunov stability theory.