Robust sensorless rotor position detection in switched reluctance motors for low speed applications

There have been several approaches to the problem of sensorless rotor position detection in switched reluctance motors but the great majority of them are not appropriate for low speed operation of SRM since those methods are based on voltage equation integration to estimate the flux or neglecting the emotional back EMF in that equation. This paper proposes a method to the sensorless control of SRM for low speed operation. A novel position estimation equation is derived based on an analytical model for SRM and current waveform. This method is robust to the winding resistance variations or measurement error and current noise. The algorithm has been implemented on the TMS320LF2407 fixed point DSP and has been applied to a 1 hp SRM test bed successfully