Servo gain optimization using a variable convergence factor
US6490120B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 13, 1999 |
| Grant date | Dec 3, 2002 |
| Priority date | — |
| Expiry date | Jul 13, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/59627
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Apparatus and method for optimizing a gain of a disc drive servo circuit, the gain used to control the magnitude of current applied by the servo circuit to a voice coil motor to position a head adjacent tracks of a disc. The servo circuit includes a servo processor which selects an initial value of the gain, and then proceeds to perform a gain convergence operation wherein the head is repeatedly moved across the disc over a number of passes and position error is accumulated during each pass. The accumulated position error is used along with a scale factor to converge the gain from an initial gain value to a final, optimal gain value. The scale factor is variable and is also converged over the successive number of passes from an initial value to a final, nominal value, in order to decrease the time required to obtain the final, optimal gain value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.