Disturbance rejection of mechanical interaction for dual-actuator disc drives using adaptive feedforward servo
US6493172B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 21, 2000 |
| Grant date | Dec 10, 2002 |
| Priority date | — |
| Expiry date | Apr 16, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B21/083
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The present invention incorporates an add-on adaptive feedforward controller into the existent track-following servomechanism of a dual-actuator disc drive to suppress the disturbance caused by mechanical interaction of the two actuator assemblies to thereby enhance the positioning accuracy at track following. The control signal fed into the power amplifier of one actuator is also used as the input signal of an adaptive controller in the other one. In an illustrative embodiment, the information is fed into an adaptive LMS filter. The output of the adaptive filter is then used as a feedforward signal to coordinate the head position with the desired track position. By matching the unknown disturbance dynamics with a filtered-x LMS (least mean square) adaptation algorithm, the output of the feedforward controller is able to cancel the disturbance from mechanical interaction, and thereby realizes the necessary fast, accurate head positioning.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.