Influence of excitation in the experimental equivalent circuit parameters identification of a switched reluctance motor

This paper analyzes the influence of excitation in the experimental determination of flux linkage vs. current vs. position relationship of a switched reluctance motor. Results of the experimental characterization of the SRM in the cases of rectangular bipolar excitation, rectangular unipolar excitation and sinusoidal excitation are compared. An equivalent model of a motor phase including magnetic flux leakage and core losses is presented and the simulation results are discussed. The component values obtained experimentally with sinusoidal excitation are maintained for both cases of rectangular excitation. The good fit between the phase current obtained experimentally and that obtained from the simulation in all three cases demonstrates the validity of the model. This enables the study of the dependence of the effects of the magnetic core on the behavior of a phase of the SRM using the same model.