Selected dynamic properties of adaptive proportional observer of induction motor state variables

This paper presents problems related to the design and the stability of adaptive proportional observer which is used for estimation of magnetic flux and motor speed in sensorless control systems of induction motor. The gain matrix of the observer was chosen by genetic algorithm and alternatively by pole placement method. It has been shown that adaptive proportional observer is stable if the motor runs at slip larger than the boundary slip determined for the observer. Moreover, it has been shown that using the optimization method it is possible to achieve better dynamic properties of the observer.