Electricity: magnetically operated switches – magnets – and electr – Electromagnetically actuated switches – Plural magnets or flux sources
Patent
1997-10-07
1999-02-16
Donovan, Lincoln
Electricity: magnetically operated switches, magnets, and electr
Electromagnetically actuated switches
Plural magnets or flux sources
335178, H01H 900
Patent
active
058724990
ABSTRACT:
An electromagnetic relay, having ON and OFF states, for connecting a source of electrical current to a load, said relay comprising: an armature movable between ON and OFF positions corresponding, respectively, to said ON and OFF states of said relay; a magnetic core surrounded by first windings forming a holding coil to magnetize said core when a first portion of electrical current is passed through said holding coil and consequently to cause said armature to move from said OFF position to said ON position as a result of a magnetic attraction produced between said magnetic core and said armature, resulting in causing a second portion of electrical current to flow through said load; said magnetic core additionally surrounded by second windings forming a load coil through which said second portion of said electrical current flows when said armature is in said ON position, said load coil producing a magnetic field which counteracts a magnetic field produced by said holding coil; and parameters of said load coil being selected such that, when said second portion of said electrical current reaches a predetermined level, a resulting loss in magnetic attraction between said armature and said magnetic core will cause said armature to be released, interrupting flow of said electrical current through said holding coil, and causing said relay to switch from said ON state to said OFF state.
REFERENCES:
patent: 5363270 (1994-11-01), Wabba
patent: 5525948 (1996-06-01), Poulsen
patent: 5701109 (1997-12-01), Poulsen
Crozier John H.
Donovan Lincoln
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