ABSTRACT
As a singly excited synchronous machine, SRM generates its electromagnetic torque solely on the principle of reluctance. In most electric machines, an attraction and repletion force between the magnetic fields caused by the armature and field windings forms the dominant part of the torque. In a SRM, the tendency of a polarized rotor pole to align with an excited stator pole is the only source of torque. It must be noted that optimal performance is achieved by proper positioning of the current pulse with respect to the magnetic status of the machine. Therefore, the sensing of the rotor position becomes an integral part of the control in a SRM drive.
