Method and apparatus for a solenoid assembly
US6615780B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 16, 2002 |
| Grant date | Sep 9, 2003 |
| Priority date | — |
| Expiry date | Aug 16, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F2007/085
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A solenoid assembly includes a solenoid having a magnetic circuit comprising stationary primary and secondary pole pieces and a moveable armature. The primary pole piece includes an inner cylindrical wall operable to define, with the armature, a fixed radial gap for the passage of magnetic flux, and a tapered outer wall operable to increase the mass of the pole piece through which flux may pass, as the armature moves axially within cylindrical inner wall, the primary pole piece further includes an inwardly tapered, conical portion that extends toward the armature which operates, with an associated conical portion on a periphery of the moveable armature, to substantially maintain the axial opening force on the armature by establishing a secondary gap for the passage of magnetic flux as the armature approaches the conical tapered portion of the cylindrical wall to compensate for the saturation of magnetic flux through the fixed air gap.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.