Modelling and design of switched reluctance motors with two phases simultaneously excited

The paper describes the design and modelling theory of switched reluctance motors in which simultaneous excitation of two phase windings can occur. The theory and design principles presented apply primarily to four- and five-phase machines. The modelling theory presented includes mutual interaction effects between adjacent phases in the switched reluctance motor. Experimental results and extensive finite-element analysis of four- and fivephase motors support the design theory. The design of four-phase motors for reduced torque ripple is proposed. A winding configuration for five-phase 1018 motors is also described which uses mutual coupling to encourage short flux paths, linking adjacent stator poles via the approaching rotoir teeth. It is shown that short flux path excitation leads to significantly improved machine performance.