Disk drive adjusting phase of adaptive feed-forward controller when reconfiguring servo loop
US9001454B1 · kind B1 · utility
Inventors
Key dates
| Filing date | Apr 12, 2013 |
| Grant date | Apr 7, 2015 |
| Priority date | — |
| Expiry date | Apr 12, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/59694
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A disk drive is disclosed comprising a disk comprising tracks defined by servo sectors, a head, and control circuitry comprising a servo control system operable to actuate the head over the disk in response to the servo sectors. The servo control system is configured into a first state, and a position error signal (PES) representing a difference between a target location for the head and a measured location for the head is generated. An actuator control signal is generated in response to the PES, a feed-forward control signal is adapted in response to the servo sectors, and the actuator control signal is adjusted using the feed-forward control signal. The servo control system is configured from the first state to a second state, and a phase of the adaptation of the feed-forward control signal is adjusted based on the second state.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.