Abstract:

An adaptive method with stability within the whole operating speed range is proposed for active suppression of multi-frequency vibration caused by the displacement sensor runout in a magnetic suspension flywheel system in this paper. First, cascaded phase-shift notch filers with unique center frequencies are designed according to characteristics of the disturbance. Then, adaptive phase-shift notch filers are cascaded and theirs phase adjusting matrixes are set to ensure the stability of magnetic bearing-rotor Closed-loop control system within the whole operating speed range. Lastly, taking the five-freedom magnetic suspension flywheel as the object, the experiments are carried out to demonstrate the effectiveness of the proposed approach, and the results illustrate that the proposed method can effectively suppress the multi-frequency vibration within the whole operating speed range.

Key words: Magnetic suspension flywheel, Vibration suppression, Displacement sensor runout, Phase-shift notch filter