Flux weakening operation of switched reluctance motors

Speed can be increased above base speed by flux weakening in the DC machine. The relationships of torque, power and speed have been characterized for the DC machine when operating from zero speed to twice base speed. To date, no such research has been performed on the switched reluctance motor (SRM) above base speed. This paper focuses on characterizing the relationships of torque, power and speed during high speed operation of the SRM. In doing so it is necessary to examine the back-EMF as speed increases from zero speed up to and including twice base speed. A complete set of dynamic curves are developed including flux-linkage, current, torque, back-EMF and instantaneous power, over the entire speed range from zero to twice base. In addition, the characterization curves for RMS phase current, average DC link current, phase voltage, machine losses, torque, input power and developed power are also presented.