Micromachined electromagnetic switch with fixed on and off posit

Details Micromachined electromagnetic switch with fixed on and off posit Micromachined electromagnetic switch with fixed on and off posit

1994-09-30

1995-12-12

Donovan, Lincoln

Electricity: magnetically operated switches, magnets, and electr

Electromagnetically actuated switches

Polarity-responsive

335177, 200512, H01H 5122

Patent

active

054753538

ABSTRACT:
A micromachined electromagnetic switch, including two soft magnets situated in fixed positions above and below a permanent magnet, toggles between two fixed positions by the application of current in an actuator coil for a brief period. The permanent magnet is attached to a micromachined hinge or spring which moves under the action of a net force, thereby opening or closing the switch. Current in the actuator coil changes the relative strength of the magnetic forces due to the soft magnets. In the absence of current in the actuator coil, the switch is kept in the open or closed position by the attractive magnetic force between the permanent magnet and either the upper or lower soft magnet, whereby the stronger force is exercised between the permanent magnet and the nearest soft magnet.

REFERENCES:
patent: 4674180 (1987-06-01), Zavracky et al.
patent: 4997521 (1991-03-01), Howe et al.
patent: 5121089 (1992-06-01), Larson
patent: 5374792 (1994-12-01), Ghezzo et al.
patent: 5386115 (1995-01-01), Freidhoff et al.

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