Magnetic actuator and method
US6737766B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 14, 2003 |
| Grant date | May 18, 2004 |
| Priority date | — |
| Expiry date | Mar 14, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F7/1607
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for controlling a plunger of a magnetic actuator includes generating a first magnetic flux at the plunger that biases the plunger opposing a first bias from a first spring having a first spring rate. A second spring is disposed in series communication with the first spring. The second spring has a second spring rate, such that a combined spring rate of the first and second springs in series is less than either of the first and second spring rates. A second magnetic flux higher than the first magnetic flux is generated biasing the plunger opposing a second bias from the first spring and the second spring in series communication.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.