Squeeze film damping for a hard disc drive
US6239943A · kind A · utility
19Cited by
5References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 8, 1996 |
| Grant date | May 29, 2001 |
| Priority date | — |
| Expiry date | Oct 8, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B33/08
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A spindle motor is described having a motor stator, a motor rotor, the motor being energized to cause rotation of the rotor supporting a single disc or a stack of discs which is mounted in such a way that the rotating bottom or top (or both) disc surface is closely adjacent to a stationary disc drive casting surface. The squeeze film action in the remaining air gap provides significant damping of the disc vibration. Typical implementation use air gaps of 0.004"-0.006" for 21/2" drives and 0.006"-0.10" for 31/2" drives.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.