Track following servo for higher density disk files

Details Track following servo for higher density disk files Track following servo for higher density disk files

G - Physics

11

B

352/21.3

G11B 5/596 (2006.01) G05B 5/01 (2006.01) G05D 3/14 (2006.01) G11B 21/10 (2006.01) H03H 11/12 (2006.01)

Patent

CA 1278377

ABSTRACT OF THE DISCLOSURE 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 Va, Vb are secured by detecting motor current sense voltage Vi, integrating it with respect to time and passing the result through a pair of novel "second order filter" means -- one hand-pass (F1), the other low-pass (F2); while also securing a third value Vc by detecting position error (signal voltage, including noise components) in the usual manner and passing it through a "second order low-pass" filter F3; then algebraically summing these to secure a relatively noise-free position error signal VXO [VXO = Va + Vb + Vc]. Thus, the summing filter array gates the position-error voltage but attenuates the (mechanical) noise component (cf. filters F2, F1 centered at wo -- e.g., 600 Hz is satisfactory here). Such "second order" filters are novel in themselves, and particularly as so applied (most especially as so-used in such a servo system).

465983

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