Magnetically balanced and centered electromagnetic machine and cryogenic refrigerator employing same
US4697113A · kind A · utility
42Cited by
13References
28Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 1, 1985 |
| Grant date | Sep 29, 1987 |
| Priority date | — |
| Expiry date | Aug 1, 2005 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF25B2309/001
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A cryogenic refrigerator includes opposing pistons driven by linear electromagnetic machines. Magnetic elements on armatures reciprocate adjacent to first and second flux paths and a transfer of flux between the flux paths with movement of either armature causes the other armature to move in a balanced fashion in an opposite direction. The armatures are driven by coils which transfer the flux from one flux path to the other. Tapers in the flux paths cause the armatures to seek a centered position, or are tailored to minimize compressor input power.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.