Electricity: magnetically operated switches – magnets – and electr – Electromagnetically actuated switches – Vacuum or hermetically sealed type
Patent
1982-01-18
1983-12-13
Broome, Harold
Electricity: magnetically operated switches, magnets, and electr
Electromagnetically actuated switches
Vacuum or hermetically sealed type
335154, 335196, H01H 166, H01H 5100
Patent
active
044207328
ABSTRACT:
Magnetically actuated devices such as, e.g., switches and synchronizers typically comprise a magnetically semihard component having a square B-H hysteresis loop and high remanent induction. Among known alloys having such properties are Co-Fe-V, Co-Fe-Nb, and Co-Fe-Ni-Al-Ti alloys which, however, contain undesirably large amounts of cobalt.
According to the invention, devices are equipped with a magnetically semihard, high-remanence Fe-Cr-Mo alloy which comprises Cr in a preferred amount in the range of 6-26 weight percent and Mo in a preferred amount in the range of 1-12 weight percent. Preparation of alloys of the invention may be a treatment of annealing, deformation, and aging.
Magnets made from alloys of the invention may be shaped, e.g., by cold drawing, rolling, bending, or flattening and may be used in devices such as, e.g., electrical contact switches, hysteresis motors, and other magnetically actuated devices.
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L. R. Moskowitz, Permanent Magnet Design and Application Handbook, Cahners Books International, 1976, pp. 211-220.
M. R. Pinnel, Magnetic Materials for Dry Reed Contacts, IEEE Transactions on Magnetics, MAG-12, 1976, pp. 789-794.
R. M. Bozorth, Ferromagnetism, Van Nostrand, 1959, p. 418.
E. Scheil et al., "Ausscheidungshartung bei Eisen-Chrom-Molybdan- und Eisen-Chrom-Wolfram- Legierungen", Archiv fur das Eisenhuttenwesen, vol. 7, 1934, pp. 637-640.
Bell Telephone Laboratories Incorporated
Broome Harold
Businger Peter A.
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