Rotor position detection method of a single phase switched reluctance motor using back EMF

This paper presents the position estimation and driving method of single phase switched reluctance motor (SRM) using back EMF. To drive SRM, the information about position of a rotor must be fully needed. Generally, a rotorpsilas position sensor is used to detect the rotor position. However, most of position sensors are complex and increase the constructing cost of the system. Moreover, these sensors tend to decrease reliability of driving system. Therefore, a detecting method of a rotorpsilas specific position using back EMF is supposed to solve those problems mentioned above. When a rotor pole and a stator pole are overlapped, a variation occurs in the back EMF waveform and the instant of the overlap can be detected. Therefore the rotor position and speed can be calculated and the SRM is driven by appropriate switching. The validity of presented method is verified through simulation and experiment.