Flux linkage determination of the switched reluctance motor from measurable quantities at steady-state operations

A new method to obtain flux linkage characteristics of the switched reluctance motor (SRM) is presented. Unlike most of the previously reported methods, the proposed method avoids the usage of a clamping device or a search coil so that it is sometimes more applicable for practical implementations. The proposed method calculates flux linkage with the measured rotor position, phase voltage and phase current of the SRM running in steady states. An error analysis indicates that errors owing to speed ripple and mutual coupling are limited in a reasonable range. The obtained flux linkage is first compared with the result of traditional voltage pulse injection method. Then it is verified by comparing the experimentally measured voltage and current waveforms with the simulated results, where the simulations are performed using flux linkage determined with the presented method. Fairly good agreements have been observed, which indicate that the presented method is effective and accurate.