Electro-magnetic devices

Details Electro-magnetic devices Electro-magnetic devices

1975-07-02

1976-11-23

Broome, Harold

Electricity: magnetically operated switches, magnets, and electr

Magnets and electromagnets

With magneto-mechanical motive device

335281, H01F 708

Patent

active

039939723

ABSTRACT:
An electro-magnet includes a pole-piece having a portion of reduced cross-section. The shape of the reduced portion provides a restriction in the magnetic circuit such that the distance moved, against a biasing force, by an armature of the electro-magnet is proportional to the current in the electro-magnet winding. The pole piece comprises aligned parts of nickel-iron alloy joined by a soft iron part whose cross-section is less than that of the nickel-iron alloy parts.

REFERENCES:
patent: 2285560 (1942-06-01), Bonanno
patent: 2318359 (1943-05-01), Bellows, Jr.

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