Multi-harmonic compensator for track following in disk drives
US5930067A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 29, 1997 |
| Grant date | Jul 27, 1999 |
| Priority date | — |
| Expiry date | Jul 29, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/596
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An adaptive servo system for a disk drive compensates for a track being off center or distorted by analyzing the spectral content of the radial variation of the centerline of a track relative to a rotation axis, generating multiple component signals having frequencies that are harmonics of the rotation frequency, and combining the component signals in a positioning signal for an actuator. Analyzing the spectral content of the radial variation can be accomplished by a discrete Fourier transform of a position error signal while generating a correction signal that cancels all or part of previously determined components of the position error signal. The system converges to generating a periodic signal that compensates for multiple harmonics in the radial variation in the position of the track.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.