Electromagnetic polar relay
US5150090A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 22, 1989 |
| Grant date | Sep 22, 1992 |
| Priority date | — |
| Expiry date | Sep 22, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H51/2245
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An electromagnetic polar relay comprising a first yoke having a main portion and first and second ends positioned at respective angles to the main portion; a second yoke, positioned to face the first yoke, having a lower end positioned to face the main portion so that magnetic reluctance between the second yoke and the main portion is larger than a magnetic reluctance between the first end of the first yoke and the main portion; an armature having a first portion movably connected to the second end of the first yoke and having a second portion movable between the first yoke and the second yoke; a coil positioned about the armature; and a permanent magnet, positioned over the main portion, having a first pole magnetically connected to the first end of the first yoke and a second pole magnetically connected to the second yoke. The higher reluctance is due to, for example, an air gap provided by a tapered edge of the second yoke. The difference in magnetic reluctance between the first and second yokes assures that an undesirably large attractive force on the armature by the second yoke is reduced in comparison with previous relay.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.