Positioning control device for two-stage actuator
US6898039B2 · kind B2 · utility
14Cited by
2References
9Claims
0Family size
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Key dates
| Filing date | Jun 23, 2003 |
| Grant date | May 24, 2005 |
| Priority date | — |
| Expiry date | Nov 9, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/5526
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.