High order sliding mode control of a sensorless induction motor

A new High Order Sliding Mode (HOSM) controller and an adaptive observer for sensorless induction motors (IM) drive are designed. The adaptive interconnected observer estimates the fluxes, the angular velocity, the load torque, and the stator resistance. The speedflux control law is an original HOSM one: a sliding manifold is designed in order to ensure finite-time convergence of sliding variable and its high order time derivatives. The Lyapunov theory is used to prove the stability of the observer then the stability of the "observer-controller". To test the feasbility of the proposed solutions, a significant low frequency benchmark is used by considering the sensorless control problem of IM. Robustness with respect to parameters variations is proved and experimentally verified.