Pole Arcs Optimization of Vernier Reluctance Motors Supplied with Square Wave Current

To maximize their performances, it is profitable to supply vernier reluctance motors (VRMs or Switched Reluctance Motors) with square wave current, but the converter has to switch this current successively into each inductive phase. This raises problems at high speeds. To obtain a high bas speed, therefore a high power, we propose to optimize pole arcs witch have a highly significant importance on the permeance wave of VRMs. The variation range of the angles is restricted by certain conditions, but within these limits optimization is possible. All dimensional parameters were taken into account and used to calculate average torque in linear as well as in saturated mode. We neglected the influence of mutual coupling between phases and this hypothesis was justified by results obtained through measurements. Though we used a model with linearized segments to minimize the number of parameters, the same method can be applied to other more accurate models. A VRM with 6-4 structure was designed and realized; it allowed validation of our theoritical model.