Positioning adaptive control method and positioning device as we

Details Positioning adaptive control method and positioning device as we Positioning adaptive control method and positioning device as we

1996-07-18

1999-08-10

Psitos, Aristotelis M.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 7804, 360 7701, G11B 5598

Patent

active

059367920

ABSTRACT:
A positioning adaptive control method and positioning device which allow rapid positioning of a head by speed-controlling a seek operation in an information storage device such as a magnetic disk unit. The seek operation moves the head to a vicinity of a target track and a following operation causes the head to accurately follow a position on the target track when the head is positioned in the vicinity of the target track. These operations are controlled based on data recorded in sectors formed on a recording plane of a disk. A variable gain of an acceleration feed forward signal is controlled sequentially by an adaptive control rule so that a deviation signal between a target speed and an actual speed of the head is reduced when the speed of the head is shifted from an acceleration or constant speed state to a deceleration state under speed control. The variable gain of the acceleration feed forward is used per each sampling for the adaptive control rule and a square value of the speed deviation signal is minimized.

REFERENCES:
patent: 4697127 (1987-09-01), Stich et al.
patent: 5426545 (1995-06-01), Sidman et al.
Papers of the Society of Instruments and Control Engineers entitled "Head Positioning Control of a Hard Disk Drive Using H.infin. Control Theory", vol. 29, No. 1, pp. 71/77 (1993).

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