Passive magnetic bearings for a spindle motor
US5541460A · kind A · utility
29Cited by
11References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 25, 1994 |
| Grant date | Jul 30, 1996 |
| Priority date | — |
| Expiry date | Feb 25, 2014 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16C2370/12
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
An apparatus for rotatably journaling a rotor of a spindle motor about a shaft comprising a plurality of annular ring multi-pole magnets, each ring comprised of a plurality of axially aligned magnets whose polarity is alternated along the radius of the ring. The annular ring multi-pole magnets are disposed on both the rotor and stator of a spindle motor in opposition in attraction mode, or a complete offset repulsion mode with like poles facing one another with an full offset, thereby forming a radially stable magnetic bearing for maintaining rotor displacement about a shaft in conjunction with a conventional axial pivot.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.