Design method for torque estimation in stepping and switched reluctance motors

VR and hybrid stepping motors and variable speed drives using the `switched reluctance motor´ (SRM) all share a common doubly-salient magnetic structure. The design method summarised also has application to all such motors. Originally developed for VR stepping motors, but extended to both hybrids and SRMs, it has good accuracy of torque prediction, whilst being convenient and simple in use. There is still a need for such design methods, both for hand calculation and rapid computer implementations. This method sits alongside finite element techinques, which still produce essentially a single numerical answer in each case