Disk drive controlling a voice coil motor during an emergency unload
US7548392B1 · kind B1 · utility
119Cited by
21References
21Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 21, 2007 |
| Grant date | Jun 16, 2009 |
| Priority date | — |
| Expiry date | May 21, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B21/12
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A disk drive is disclosed including a disk, a spindle motor operable to rotate the disk, a head, and a voice coil motor (VCM) operable to actuate the head over the disk, wherein the VCM comprises a voice coil. The disk drive further comprises a capacitor, and a back electromotive force (BEMF) voltage generator operable to generate a BEMF voltage from the spindle motor. The disk drive further comprises switching circuitry operable to connect the voice coil to the capacitor while accelerating the VCM, and to disconnect the voice coil from the capacitor and connect the voice coil to the BEMF voltage while decelerating the VCM.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.