Electromagnet system for a switch

Details Electromagnet system for a switch Electromagnet system for a switch

2005-06-14

2005-06-14

Barrera, Ramon M. (Department: 2832)

Electricity: magnetically operated switches, magnets, and electr

Electromagnetically actuated switches

Plural magnets or flux sources

C335S132000, C335S234000, C335S236000

Reexamination Certificate

active

06906605

ABSTRACT:
An electromagnet system for a switch includes a main magnetic circuit including a magnet yoke and a magnet armature mechanically linked to a contact apparatus. At least one permanent magnet is disposed in the main magnetic circuit for generating a holding force for the magnet armature. A shunt circuit is provided parallel with the main magnetic circuit so that the permanent magnet is a magnetic energy source for the shunt circuit. The shunt circuit includes pole legs and a yoke arc of the magnet yoke. The magnet armature is capable of contacting the pole legs so as to close the shunt circuit. An excitation winding is provided for each of the pole legs for to generating a pull-in force for the magnet armature. The electromagnet system is magnetically dimensioned such that a minimum magnetomotive force of the excitation windings is sufficient for opening the electromagnet system.

REFERENCES:
patent: 4020433 (1977-04-01), Uchidoi
patent: 4546339 (1985-10-01), Kubach
patent: 5737172 (1998-04-01), Ohtsuka
patent: 1164548 (1964-03-01), None
patent: 1277420 (1968-09-01), None
patent: 3520879 (1986-09-01), None
patent: 3910810 (1990-10-01), None
patent: 19526038 (1996-01-01), None
patent: 1119635 (1956-06-01), None
patent: 9831034 (1998-07-01), None

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