Vertical actuator having a gravity compensation device
US7719144B2 · kind B2 · utility
2Cited by
7References
12Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 8, 2008 |
| Grant date | May 18, 2010 |
| Priority date | — |
| Expiry date | Jan 7, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K33/16
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A vertical actuator has a stationary part that includes an upper part made of magnetic material which is magnetically separated from a yoke which bears a coil. The upper magnetic part generates an overall reluctance force on the movable part of the actuator which, over the entire functional range of the actuator, is slightly greater than the gravitational force. When the coil is not energized, the movable part has a position of stable equilibrium which is in the upper section of this functional range.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.