Spindle motor back-EMF synchronous rectifier
US6188192A · kind A · utility
21Cited by
8References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 30, 1999 |
| Grant date | Feb 13, 2001 |
| Priority date | — |
| Expiry date | Jul 30, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/012
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A disk drive system including a disk having a magnetic surface and suppported for rotation on a spindle, a magnetic head being movable relative to the magnetic surface, and a spindle motor for driving the spindle. The motor generates a back-EMF voltage during an emergency condition and switches said back-EMF voltage during said emergency condition. A comparator circuit compares different phases of back-EMF voltage, and a control circuit controls said plurality of switches to supply said back-EMF voltage to direct said head to a stored position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.