Cascaded design methodology for switched reluctance motors considering optimum control

Switched reluctance motors (SRM) have a cheap and robust structure, which makes them interesting for electric vehicle applications. In this paper, a new optimization scheme for the design of SRM is proposed. The design methodology is then used to design a 127 kW high speed SRM for electric vehicles. The optimization procedure has a cascaded structure with a geometry optimization as the outer loop and a new control optimization as the inner loop. This new control scheme ensures maximum efficiency with the constraint of a minimum torque ripple by developing a current profile, which considers the non-linear behavior of the switched reluctance motor and the declining current dynamics with increasing speed. The control scheme is used to evaluate rated power and motor efficiency of the relevant operating points within the outer geometry optimization of the design methodology.