Data disk drive velocity estimator
US4691152A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 19, 1986 |
| Grant date | Sep 1, 1987 |
| Priority date | — |
| Expiry date | Feb 19, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01P7/00
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A velocity estimator for a voice coil motor driven actuator is implemented by integrating coil current to generate the estimated velocity and integrating the estimated velocity signal to produce an estimated position signal. The estimated position signal and a measured position signal are compared and the derived error signal is applied as negative feedback to the summing junctions at the inputs of each of the integrators. The use of an integrated signal results in reduced noise influence on the position error signal which, in the environment of a data disk drive, results in more reliable recording of track crossings and the ability to meet rigid product specifications using simple servo patterns.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.