Stability in the passivity based control with robust non linear observer of the induction motor

This paper mainly deals with the design of passivity control with an observer for a special class of nonlinear systems. In this work, we present the design of an observer for a special class of nonlinear systems satiating some regularity assumptions. The solution to the output feedback torque and rotor flux tracking problem for an induction motor model given in the natural frame was proposed In this approach the design of controller and observer is interlaced and global stability results,for the total system is proved It must be pointed out that the existing observer in the literature is simple, with only updating from current error terms in the rotor equations. The control algorithm is studied through simulations and applied in many configurations (various set point flux and speed profiles and torque disturbances), and is shown efficient. Copyright (C) 2007 Praise Worthy Prize S.r.l. - All rights reserved.