Modeling and Determination of Switched Reluctance Machine Nonlinearity

Abstract

Switched reluctance motor (SRM) is gaining more interest in the last decades due to its wide range of speed operation, thermal robustness, high performances and low manufacturing cost. For these reasons, it is investigated as an alternative generator for many applications like wind energy conversion, aircraft actuators and electric vehicles. The SRM is considered highly nonlinear which makes the SRM modeling difficult to achieve. This paper presents a new method for analytical modeling and identification of SRM nonlinearity using standstill tests. It is shown that the electrical model of the SRM machine can be described by block-oriented nonlinear systems. Specifically, this system nonlinearity can be exactly described by a nonlinear block followed by a linear element. The proposed method differs from the existing methods used to estimate the inductance of SRM. Indeed, the parameters estimation algorithm is based only upon the accessible input-output measurement data.