Feedforward Control Using Sampled-Data Polynomial for Track Seeking in Hard Disk Drives
Atsumi, T.
Industrial Electronics, IEEE Transactions on
Volume 56, Issue 5, May 2009 Page(s):1338 - 1346
Digital Object Identifier   10.1109/TIE.2008.2010098
Summary:To decrease the seek time of hard disk drives, a feedforward control method was developed by using a sampled-data polynomial. The sampled-data polynomial satisfies the boundary conditions that include the characteristics of the zero-order hold, and compensates for the discretization error caused by the zero-order hold without the need for complicated calculations. Therefore, the feedforward control using the sampled-data polynomial enables real-time calculation and does not require lookup tables which need a large amount of memory. The parameters of the sampled-data polynomial are designed by using shock-response-spectrum analysis to minimize the settling vibrations caused by the feedforward control inputs. When the proposed method was applied on a hard disk drive, it significantly reduced the amount of tracking error in the seek control and also reduced the seek time.

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