Positioning control device for two-stage actuator

Details Positioning control device for two-stage actuator Positioning control device for two-stage actuator

2005-05-24

2005-05-24

Faber, Alan T. (Department: 2651)

Dynamic magnetic information storage or retrieval

General recording or reproducing

Recording-or erasing-prevention

C360S078090, C360S077040, C360S078070

Reexamination Certificate

active

06898039

ABSTRACT:
In a positioning control device for a two-stage actuator having a coarse-movement actuator and a fine-movement actuator, a notch filter having a cutoff frequency fn is provided to a coarse-movement control loop, and the fine-movement actuator is driven by a sine wave of the frequency fn. At the frequency fn, a head position signal becomes identical with an output signal of the fine-movement actuator, by which the gain of the fine-movement actuator can be estimated by an adaptive identification unit with high accuracy based on the control input to the fine-movement actuator and the head position signal.

REFERENCES:
patent: 6674605 (2004-01-01), Ell
patent: 20020176201 (2002-11-01), Hsin et al.

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