The switched reluctance motor (SRM) exhibits various desirable features, including simple construction, high reliability, and low cost. However, it has not been widely used in practical applications because of its large torque ripple, noise, and low power factor. Furthermore, the optimum design has not been clarified. In this paper, we calculate fundamental equations for the characteristics of the SRM under a simple assumption. On the basis of these fundamental equations, we consider the relation between efficiency and loss.
