Track following servo system for a disk file

Details Track following servo system for a disk file Track following servo system for a disk file

1984-05-02

1986-06-10

Stellar, George G.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

318561, G11B 556

Patent

active

045946221

ABSTRACT:
The performance of a track-following servo system for a disk file is improved by the feeding forward of a prediction of track eccentricity into the normal feedback control loop. The eccentricity related function is derived by combining functions of the position error signal and of the input signal to the head position actuator during at least one revolution of the disk. The eccentricity function is stored and then fed forward to the actuator during a subsequent revolution of the disk. The eccentricity function may be a track shape position signal formed from the difference of the PES and the double time integral of the actuator current. Alternatively it may be an actuator current profile formed from the difference between the actual current and the double time derivative of the PES.

REFERENCES:
patent: 4149199 (1979-04-01), Chick et al.
patent: 4536809 (1985-08-01), Sidman

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