Spindle motor and complex bearing assembly for use with the spindle motor
US6307295A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 27, 2000 |
| Grant date | Oct 23, 2001 |
| Priority date | — |
| Expiry date | Apr 27, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K7/086
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A complex bearing assembly has a sleeve and a shaft inserted in the sleeve. The shaft is rotatably supported in the sleeve through radial and axial bearings, i.e., hydrodynamic bearing and magnetic bearing. In particular, the axial bearing includes first and second magnetic members or magnet rings. The first magnetic member is secured on the shaft in a coaxial fashion, but the second magnetic ring is secured on the sleeve in an eccentric fashion. This causes an eccentric bias that forces the rotating shaft to a certain radial direction, allowing the rotating shaft becomes to lose frictional contacts with the sleeve at lower rotational number. This in turn decreases wears of the sleeve and the shaft, increasing the durability of the bearing assembly.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.