Grounding and conductivity improvement for ferrofluid seals
US6029978A · kind A · utility
11Cited by
12References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 22, 1997 |
| Grant date | Feb 29, 2000 |
| Priority date | — |
| Expiry date | Sep 22, 2017 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16J15/43
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A motor is disclosed which includes a shaft and a hub rotating relative to one another and defining a bore therebetween. Also disclosed is a magnetic fluid seal which includes pole pieces supported from the hub, the pole pieces extend toward the shaft. The pole pieces sandwich a non-conducting magnet in a space between the pole pieces. In addition, a contacting process is supported from one of the pole pieces for making electrical contact with the other pole piece to enhance electrical conductivity between the hub and shaft.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.