Linear actuator and apparatus utilizing the same
US7517721B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 12, 2007 |
| Grant date | Apr 14, 2009 |
| Priority date | — |
| Expiry date | Oct 12, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01L21/67144
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A linear actuator includes a first inner permanent magnet joined to an inner yoke, a second inner permanent magnet joined to the inner yoke, an outer yoke, a member interconnecting the outer and inner yokes, a first outer permanent magnet joined to an inner surface of the outer yoke, a second outer permanent magnet joined to an inner surface of the outer yoke, a first armature coil inserted into a gap between the first inner and outer permanent magnets, and a second armature coil inserted into another gap between the first inner and outer permanent magnets. The inner yoke includes an inner thicker portion axially opposed to the inner permanent magnets and having a larger radial thickness than a remaining portion. The outer yoke includes an outer thicker portion axially opposed to the first and second outer permanent magnets and having a larger radial thickness than a remaining portion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.