A Joint Feature Position Detection-Based Sensorless Position Estimation Scheme for Switched Reluctance Motors

摘要

For a switched reluctance motor, it is important to simplify the sensorless control method in medium and high speed operation. A key solution is to detect a single feature position in a single electric cycle. Normally, the aligned position is a typical feature position, which needs to be detected. However, it is difficult to locate the aligned position with the traditional phase inductance slope zero-crossing scheme, especially when the turn-on angle is advanced. In this paper, a transformer electromotive force and motional electromotive force crossing point estimation method is presented, which is combined with the phase inductance slope zero-crossing point estimation method to estimate the aligned position. This method is capable of avoiding the error position index pulses generated at the turn-on position and the regions nearby the unaligned position. Only one position index pulse that represents the aligned position in each electric cycle can be estimated. The experimental results verify the validity of the proposed method.