Title :
Improvement of servo robustness for digital sector servo system [hard disk drives]
Author :
Yamaguchi, T. ; Shishida, K. ; Hirai, H. ; Tsuneta, K. ; Sato, M.
Author_Institution :
Hitachi Ltd., Ibaraki, Japan
fDate :
9/1/1992 12:00:00 AM
Abstract :
In order to improve the servo performance of the digital sector servo, the authors developed initial value compensation for the digital variable structure control system and applied it to a 3.5-in disk drive. This compensation method involves inputting initial values, calculated by minimizing a performance index, into settling servo compensators when the servo mode is switched from seeking to settling. Implementation is quite easy for digital systems. Experimental results show good robust performances for large velocity fluctuations at switching
Keywords :
digital control; error compensation; hard discs; magnetic heads; position control; servomechanisms; variable structure systems; 3.5 in; digital sector servo system; digital variable structure control system; disk drive; initial value compensation; magnetic head positioning; servo robustness; Control systems; Hard disks; Magnetic heads; Performance analysis; Robust control; Robustness; Sampling methods; Servomechanisms; Switches; Target tracking;
Journal_Title :
Magnetics, IEEE Transactions on
