Sensorless initial mover position detection of the planar switched reluctance motor using bootstrap circuit

This paper proposes a sensorless initial mover position detection method with bootstrap circuit for the planar switched reluctance motor (PSRM). The mechanical structure and mathematical model of the PSRM is first presented. The sensorless initial mover position detection method is then developed based on bootstrap circuit. For this method, the voltage and the peak time of voltage are measured by charging a bootstrap capacitor of each phase of the PSRM; the position range and the inductance are calculated theoretically according to the peak time; the initial position can be calculated theoretically in terms of the built inductance model and position range. Furthermore, simulation is carried out base on ANSYS Maxwell. Simulation results demonstrate that the relative error between the detected position and the real position is less than 3% with the proposed method; the effectiveness of the proposed method is verified.