Experimental Evaluation on Hinf DIA Control of Magnetic Bearings with Rotor Unbalance

This paper deals with an experimental evaluation on Hinf DIA control of magnetic bearings with rotor unbalance. Hinf control problem which treats a mixed Dis-turbance 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 of H8 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.