Method and apparatus for handling multiple resonance frequencies in disc drives using active damping
US6690534B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 5, 2001 |
| Grant date | Feb 10, 2004 |
| Priority date | — |
| Expiry date | Oct 23, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/5582
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method of handling multiple resonance frequencies in a disc drive includes monitoring a position error signal (PES) for an actuator arm, generating a plurality of feedforward compensation signals from the PES using a plurality of bandpass filters, and applying the compensation signals to a servo control signal. Each filter has a center frequency that is set to a problematic resonance frequency. The method may also include identifying the problematic frequencies by, for example, commanding a movement of the actuator arm, collecting data points for the PES that are associated with the movement, and performing a digital fourier transform of the data points to identify resonant frequencies. Other methods of identifying problematic frequencies include analyzing PES zero-crossing data, or using principal component analysis.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.