Disk drive optimizing spindle motor torque by adjusting leading phase angle during spin-up
US8610391B1 · kind B1 · utility
111Cited by
27References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 29, 2011 |
| Grant date | Dec 17, 2013 |
| Priority date | — |
| Expiry date | Dec 15, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P6/22
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A disk drive is disclosed comprising a head actuated over a disk, and a spindle motor for rotating the disk, the spindle motor comprising a plurality of windings. During a spin-up operation a sinusoidal driving voltage is applied to each winding of the spindle motor. A back electromotive force (BEMF) voltage generated by at least one of the windings is measured, and a rotation speed of the spindle motor is measured. The sinusoidal driving voltage is adjusted in order to optimize a lead angle relative to the rotation speed, wherein the lead angle represents a degree the sinusoidal driving voltage leads the BEMF voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.