コンタクトスライダを有するヘッド位置決め機構のシーク制御(<特集>D & D 2007)

概要

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This paper discusses the seek control for head positioning mechanism with a contact slider in hard disk drives (HDDs). In General, to increase the control force is the most popular step used to decrease the seek time ; it often results however in transient vibration of HDDs that has start and stop motion. For high-speed, high-precision seeking mechanisms, it is necessary to apply control methods which induce no residual vibration at a target track even with a large control force. The proposed positioning control system consists of two-degrees-of-freedom controller. The optimal point-to-point (PTP) control with a frequency-shaped weighting function is employed in feedfoward input design to eliminate vibratory responses due to mechanical vibration modes. To estimate and compensate the friction force of the contact slider generated by the contact of a disk and a slider, a equivalent disturbance estimate observer is designed. The validity of the proposed approach has been verified by long span seek simulation trials in the benchmark problems for HDDs.
社団法人日本機械学会の論文
2008-05-25