Design of Full Order Observer for VSI Fed PMSM Drive

This paper presents the PMSM mathematical model based on the rotor reference frame. The state feedback control for a Permanent Magnet Motor requires the knowledge of all states. In this paper we are estimating all the states of PMSM, both accessible and inaccessible by using full order observer, so as to meet with the insensitivity to the parameter variation. However, the state space model contains some nonlinear terms i.e. the product of different state variables. The asymptotic state observer, which approximately reconstructs the state vector for linear systems without uncertainties, was presented by Luenberger. In this work, a modified form of such an observer is used by including a nonlinear term involving the speed. So, the observer is designed in the framework of nonlinear control; its stability and rate of convergence is discussed.

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