Vibration cancellation in a disk drive by using an acceleration sensor and adaptively adjusting its gain to minimize external acceleration effects
US6914743B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 30, 2000 |
| Grant date | Jul 5, 2005 |
| Priority date | — |
| Expiry date | Jul 6, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/59694
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Disclosed is a disk drive using an accelerometer to sense linear vibration and cancel its effects with an adaptive algorithm during track following. The accelerometer is oriented to detect acceleration associated with torque that tends to cause the actuator to move off-track notwithstanding the efforts of the servo control system. The accelerometer's filtered output is used to modify the control effort. The disk drive uses the position error signal to adaptively filter the accelerometer's output in an effort to mathematically converge on a set of optimal filter coefficients and thereby reduce the effect of vibration that may otherwise impose a torque on the actuator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.