Novel rotor-flux observer using observer characteristic function in complex vector space for field-oriented induction motor drives

Abstract

This paper proposes a new strategy to estimate the rotor flux of an induction machine. The electrical model of the induction machine presents the basic idea based on an structure, which is composed of a voltage model and a current model. However, the former has the defects of sensitivity to machine parameters in the low-speed range, and the latter also has defects that are sensitive to the machine parameters in wide-speed range. In spite of these shortcomings, the closed-loop flux based on two models has been a prevalent estimation for direct field-oriented control. In this paper, a generalized analysis called the observer characteristic function method is proposed to analyze all kinds of the linear flux observers in an unified form. By the characteristic function being utilized, the estimated rotor-flux error involved in the classical methods can be easily clarified. Moreover, the novel rotor-flux based on this analysis is also presented. The proposed flux is robust to the offset voltage and to parameter variation. The effectiveness of the novel flux has been verified by the numerical analysis and experimental results.