Hi all. I am trying to develop a controller for switched reluctance motor which minimizes torque ripple. My design is acquiring torque ripple information from speed signal. In simulation a high pass filter for speed gives me good ripple information. But in experiments I am using a 500 PPR optical absolute encoder to get the position and then calculate the speed using microcontroller(dspace) capture module. But the filtered speed signal do not provide much ripple information. Can anyone suggest any method to extract ripple information from low resolution speed signal.
Thanks