Electromagnetic drive apparatus having a flat coil

Details Electromagnetic drive apparatus having a flat coil Electromagnetic drive apparatus having a flat coil

1985-07-15

1990-08-21

Burr, Edgar S.

Electricity: magnetically operated switches, magnets, and electr

Magnets and electromagnets

With magneto-mechanical motive device

101 9305, 400121, 400124, H01F 708, B41J 227

Patent

active

049510231

ABSTRACT:
An electromagnetic drive apparatus for undertaking linear or circular movements as a flat coil disposed within a magnetic circuit, which may be formed by a iron core having one or more permanent magnets. The magnetic circuit includes at least one plate or coating of electrically conductive material which is spaced from the coil and coextensive with the area of movement of the coil within the magnetic circuit. The electrically conductive material promotes rapid change of the coil current due to induced eddy currents and thus contributes to a low response time, or alternatively to a high response speed, of the drive apparatus, particularly with the use of a pulsed drive signal.

REFERENCES:
patent: 3136934 (1964-06-01), Henry-Badot
patent: 3161793 (1964-12-01), Laithwaite
patent: 3935399 (1976-01-01), Lian
patent: 4022311 (1977-05-01), Krull
patent: 4129390 (1978-12-01), Bigelow
patent: 4211493 (1980-07-01), Costello
patent: 4260269 (1981-04-01), Peroutky
patent: 4349283 (1982-09-01), Sapitowicz

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