Spindle motor and disk drive having the same
US5519270A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 16, 1993 |
| Grant date | May 21, 1996 |
| Priority date | — |
| Expiry date | Aug 16, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K2203/12
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A spindle motor includes a permanent magnet multipolarized in a circular direction of the permanent magnet. The permanent magnet generates magnetic fluxes in a radial direction of the spindle motor. A core assembly has core pieces, the core pieces respectively including first portions are circularly arranged and face the permanent magnet via a gap, and second portions guide magnetic fluxes in parallel with a rotation axis of the spindle motor. Windings are turned around the second portions of the core assembly and have axes of the windings extending in parallel with the rotation axis of the spindle motor. A yoke magnetically couples the core pieces with each other.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.