Spindle motor
US7382076B2 · kind B2 · utility
8Cited by
6References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 18, 2004 |
| Grant date | Jun 3, 2008 |
| Priority date | — |
| Expiry date | Oct 31, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B19/2009
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The disclosed is a spindle motor most suitable for magnetic disk drives, optical disk drives or the like capable of constraining undesirable cogging torques to a low level and of winding a coil regularly. In particular, the inward periphery of magnetic pole of iron core for a stator includes of an arc shaped surface concentrically to the outward periphery of rotor magnet and a pair of flat surfaces, generally perpendicular to the centerline of magnetic pole, attached to both sides of the arc shaped surface peripherally. The configuration can reduce the cogging torques without any decrease in motor efficiency.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.