Electromagnetic device

Details Electromagnetic device Electromagnetic device

1974-11-26

1976-04-13

Harris, George

Electricity: magnetically operated switches, magnets, and electr

Electromagnetically actuated switches

Polarity-responsive

335 81, 335234, H01H 5127

Patent

active

039507181

ABSTRACT:
An electromagnetic device made of flat components, which requires no resetting spring for the armature which is high in efficiency and small in size. The device comprises first and second yokes in contact respectively with magnetic pole surfaces of a permanent magnet and presenting pole faces opposed to each other. A pivoted armature, swingable between the pole faces on first and second yokes, by reason of the permanent magnetism, normally engages the pole face on the second yoke. A coil is wound around the armature, with current in the coil serving to overcome the permanent magnetism so that the armature moves to the opposite position against the pole face on the yoke. The device can be of latch type or single stable type by making the armature or either one of the yokes of a semihard magnetic material which is low in coercive force and high in residual magnetic flux density.

REFERENCES:
patent: 2930945 (1960-03-01), Weathers et al.
patent: 3295023 (1966-12-01), Peras
patent: 3317871 (1967-05-01), Adams
patent: 3486138 (1969-12-01), Chalmers et al.
patent: 3510812 (1970-05-01), Takamura et al.
patent: 3585547 (1971-06-01), Sturman

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