A Notch Filter for Magnetically Suspended Rotors Based on Rotating Coordinate Transformation

Synchronous vibration are obstacles to the performance improvement of a rotating shaft supported by active magnetic bearings (AMBs). Based on the synchronous rotating coordinate transformation, this paper proposed a novel notch filter for the autobalancing of magnetically suspended rotors. After the analysis of the frequency characteristics of the novel notch filters, the calculating method of the convergence rate and comparison with the traditional notch filter are further investigated. Finally, the corresponding simulations and experiments are conducted. The results demonstrate that the novel notch filter has a good significant effect on the synchronous vibration of weakly gyroscopic rotors.