Switched
Reluctance motors have a different number of salient rotor and stator teeth. The stator teeth are wound with coils which are alternately energized and deenergized. The teeth with the energized windings always attract the nearest rotor teeth like an electromagnet and are deenergized when (or just before) the rotor teeth are aligned with the attracting stator teeth. In this position, the next phase will be energized on other stator teeth attracting other rotor teeth. In general, the machine is equipped with a rotor position sensor to switch over at the right time. But there are also sensorless control methods based on the stator current or torque.
