μ-analysis applied to field oriented control of induction motor

This paper presents an alternative method, the `μ-Analysis´, for studying the robustness of the well-known field oriented control of an induction machine. The method, based on the structured singular value analysis, is used to analyse the robust stability and robust performance of closed-loop systems here the motor with its associated control law, against several simultaneous plant uncertainties. The purpose of this paper is to give the worst-case effects of motor parameter variations on the stability and performance of the field-oriented drive structure. Furthermore, the author shows that the unmodeled drive dynamics can be introduced as unstructured uncertainties by using frequency weighting transfer functions