Electromagnetic actuator
US6987437B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 27, 2003 |
| Grant date | Jan 17, 2006 |
| Priority date | — |
| Expiry date | Mar 27, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F7/1607
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An electromagnetic actuator has a movable core, a housing that holds the movable core so that the core may freely reciprocate, and an attractive part that applies a magnetic force to pull the movable core in one of the reciprocating directions. The electromagnetic actuator further has a stator that constitutes a magnetic circuit along with the movable core. At least one of the sliding faces of the housing and the movable core in contact with each other is subjected to gas soft nitriding, salt-bath soft nitriding, sulfo-nitriding, or nitriding treatment. The surface roughness of such a nitrided face is controlled to be within a prescribed range, so that the wear of the sliding faces of the movable core and the housing can be reduced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.