Torques and yoke thickness for Switched Reluctance Motor

Abstract

A Switched Reluctance Motor has a doubly salient structure, both stator and rotor have saliency and it has an advantage in a harsh environments due to a simple and robust structure. There are two winding methods, the one is fully pitched winding and other is short pitched winding. A fully pitched winding of Switched Reluctance Motor has a number of different current-excitation patterns such as unipolar and bipolar. Its winding configuration results in more efficient use of the electric circuit, with each phase contributing to torque for more than half of the cycle of rotation. Therefore, for many machine configurations significantly greater torques are predicted for a given frame size. But output torques depend on the yoke thickness. This paper examines the output torques for the different yoke thickness and different current-excitation by the experimental and analytical results using the two dimensional finite element method. As a result, the torque performance of fully pitched winding SRM driven by the bipolar excitation is extremely affected with the yoke thickness.