Experimental Evaluation onH∞ DIA Control of Magnetic Bearings with Rotor Unbalance

This paper deals with an experimental evaluation on H∞ DIA control of magnetic bearings with rotor unbalance. H∞ control problem which treats a mixed Disturbance and an Initial state uncertainty Attenuation (DIA) control is expected to provide a good transient property, and we confirmed that DIA control has a good rotational performance by some experiments. In this paper, we propose a modified control system design ofH∞ DIA control in order to consider the periodic disturbance for the magnetic bearings. In fact, we get a controller taken a peak at specified frequency by adding a frequency weighting function in generalized plant. Experimental results show that the proposed robust control approach is effective for improving rotational performance.