Method and apparatus for real-time filtering of a position error

Details Method and apparatus for real-time filtering of a position error Method and apparatus for real-time filtering of a position error

1996-12-13

1999-02-23

Edun, Muhammad N.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 75, 360 69, G11B 5596

Patent

active

058750665

ABSTRACT:
A method and apparatus for real-time filtering of a position error signal in a servo system of a disk drive. Pre-calculated periodic components of the position error signal (PES) are used as future values in a real-time filter, preferably a real-time recursive median filter. This minimizes the amount of time-lag between obtaining the raw PES measurement from the disk surface and the providing the corresponding filtered PES output. This reduced time-lag minimizes the effect on the phase margin (PM) and results in improved servo stability. The invention can be used not only in servo systems in disk drives, but also in servo systems of other mechanical moving storage devices and in servo systems of rotating mechanical machinery in general, where the signal to be filtered may be a position error, velocity error, acceleration error, and the like.

REFERENCES:
patent: 4380034 (1983-04-01), Krake
patent: 4412165 (1983-10-01), Case et al.
patent: 4536809 (1985-08-01), Sidman
patent: 4594622 (1986-06-01), Wallis
patent: 4616276 (1986-10-01), Workman
patent: 4785422 (1988-11-01), Ohtake et al.
patent: 4982297 (1991-01-01), Tsujisawa
IBM Technical Disclosure Bulletin, vol. 29, No. 12, May 1987, pp. 5239-5240 .

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