LOW VOLTAGE TRANSFORMER RELAY
The invention relates to an electromagnetic device and specifically to a low voltage transformer relay and a ferromagnetic core used therein. The electromagnetic device has opposed pole faces defining a gap area, a source of operating flux for establishing a magnetic field in the gap, a source of la...
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Format: | Patent |
Sprache: | eng ; fre |
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Zusammenfassung: | The invention relates to an electromagnetic device and specifically to a low voltage transformer relay and a ferromagnetic core used therein. The electromagnetic device has opposed pole faces defining a gap area, a source of operating flux for establishing a magnetic field in the gap, a source of latching flux for retaining an armature in contact with either of the pole faces, and a source of counter flux proximate the gap. The source of counter flux proximate the gap operates to confine the operating flux to within the gap. The source of latching flux utilizes a flux return bracket for conducting flux between the source of latching flux and the armature. Further, the source of latching flux has a surface area A perpendicular to the flux path and a length L along the flux path such that the factor L/A is less than 1 so that a path of low reluctance is provided for a portion of the operating flux. Further, the operating legs of the ferromagnetic core are constructed from tapered first and second leg elements which have continuous tapered interfaces adapted to cooperatively mate forming low reluctance first and second legs. Such an electromagnetic device may be utilized with advantage as a low voltage transformer relay in order to control an electrical load by a plurality of low voltage switches located in various locations. |
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