Techniques for disk servo track following

Electricity: motive power systems – Positional servo systems – With stabilizing features

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318611, 318619, G05B 501

Patent

active

048855162

ABSTRACT:
Described is a novel technique and associated arrangement for determining the noise-free value of a system parameter (e.g., head position in a disk drive) which is time variable and (usually) has a noise component as detected. The technique involves processing the (as detected) noise-including value and passing it through "Second Order/Summing" filter means.
For instance, the technique is described as particularly useful with the "track-following servo" (part of the transducer positioning means) in a high density disk file (where track density is higher than usual) to secure superior head-displacement error values which are more noise-free. Thus, (see FIG. 4), a pair of first values V.sub.a, V.sub.b are secured by detecting motor current sense voltage V.sub.i, integrating it with respect to time and passing the result through a pair of novel "second order filter" means--one hand-pass (F.sub.1) the other low-pass (F.sub.2); while also securing a third value V.sub.c by detecting position error (signal voltage, including noise components) in the usual manner and passing it through a "secod order low-pass" filter F.sub.3 ; then algebraically summing these to secure a relatively noise-free position error signal V.sub.xo

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