Rotor Position Estimation of Switched Reluctance Motors Based on Digital Amplitude Technique

To improve the efficiency of switched reluctance motors (SRMs), detecting the correct position of the rotor is essential. Many sensorless control methods have been proposed, which everyone follows different techniques. Most of control procedures are related to a high speed analog-to-digital converter and also are required a large volume data processing. In this paper, a new method has been provided which has high reliability and also increase the possibility of rotor position recognizing from aligned to unaligned states on several points. By injecting a pattern of frequencies to the un-energized phase and comparing the amplitude of the output signals after a notch filter on the last stage with reference voltages, the position of the rotor can be determined on several points without the need of measuring any analog parameters. In this proposed, the produced excitation pulses have been compared with the output pulses from the Hall Effect sensors which are embedded on the motor shaft. With this approach, the verification of the proposed method is confirmed.