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Improved proximate time-optimal sliding-mode control of hard disk drives

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4 Author(s)
Zhou, J. ; Sch. of Electr. & Electron. Eng., Nanyang Technol. Univ., Singapore, Singapore ; Zhou, R. ; Wang, Y. ; Guo, G.

An improved proximate time-optimal positioning control approach with discrete-time sliding-mode control theory for a hard disk drive servo is presented. A third order velocity reference profile is introduced to improve the second order ones in the conventional proximate time-optimal servomechanism. The proposed approach eliminates the mode-switching mechanism and dramatically reduces the seek time by 5-50%. Moreover, it is robust to unmodelled dynamics and parameter variations. Its effectiveness is verified in a simulation

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Control Theory and Applications, IEE Proceedings -  (Volume:148 ,  Issue: 6 )