Title :
High bandwidth design of track-following control system of hard disk drive using H∞ control theory
Author :
Hirata, Mitsuo ; Hasegawa, Yumi
Author_Institution :
Utsunomiya Univ., Tochigi
Abstract :
In hard disk drives, it is important to increase the control bandwidth in order to shorten the track pitch for larger data capacity. However, it is difficult for H∞ control theory to increase the control bandwidth if the mechanical resonance modes have uncertainty. This is because that the robustness of the H∞ control theory is assured by the small-gain theorem for additive or multiplicative perturbation and the control bandwidth is limited by the uncertainty. In this study, we propose an H∞ design method for a high bandwidth design by introducing a new uncertainty model with feedforward and feedback path in order to reduce the conservatism of robust design. The effectiveness is shown by numerical simulations.
Keywords :
H∞ control; control system synthesis; disc drives; hard discs; robust control; uncertain systems; H∞ control theory; additive perturbation; data capacity; feedback path; hard disk drive; mechanical resonance mode; multiplicative perturbation; small-gain theorem; track-following high bandwidth control system design; uncertain system; Bandwidth; Control systems; Control theory; Design methodology; Feedback; Hard disks; Resonance; Robust control; Robustness; Uncertainty;
Conference_Titel :
Control Applications, 2007. CCA 2007. IEEE International Conference on
Conference_Location :
Singapore
Print_ISBN :
978-1-4244-0442-1
Electronic_ISBN :
978-1-4244-0443-8
DOI :
10.1109/CCA.2007.4389215
