Abstract
We have presented a control system design method for triple-stage actuator systems in HDDs (hard disk drives) with the Robust Bode (RBode) plot. The RBode plot represents robust performance criterion with gray are a on the Bode plot. Using the RBode plot, control engineers can easily design controllers that suppress disturbances with frequency response data alone. To employ the RBode plot for the triple-stage actuator system, we proposed a design method with the RBode plot for Multi-Input-Single-Output system. Simulation results shows that the proposed method enable us to improve a positioning error in the triple-stage actuator system of HDDs.
