Electromagnetic valve operator
US5010911A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 15, 1989 |
| Grant date | Apr 30, 1991 |
| Priority date | — |
| Expiry date | Dec 15, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/1767
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A bi-stable electromagnet operator having an armature plate which is held in a first position by a permanent magnet and in a second position by a spring. An electromagnet is provided to enable the armature plate to move from the first position to the second position. The magnet has high coercivity and therefore the permanent magnet and core of the electromagnet can be in close magnetic contact both when the armature is in the first position and in the second position. The high coercivity of the permanent magnet provides for sufficient flux flow to maintain magnetization when the armature plate is in the second position away from the permanent magnet. Typically, the permanent magnet comprises neodymium.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.