The Method of Position Sensorless Inductance Model of SRM Based on FEA

Abstract

The paper presents a position estimation method of the Switched Reluctance Motor(SRM) based on inductance model through FEA. The phase inductance of SRM is seriously nonlinear. Based on FEA, Fourier analysis result of phase inductance shows that more than three times harmonic contents are smaller. Ignoring more than three times harmonic, the simplified inductance model is expressed. Then a new rotor position estimation method is presented, which is based on the inductance model. Experiment results show that the effectiveness of the method proposed is verified, and under different saturated conditions, the method can accurately estimate the rotor position of Switched Reluctance Motor.