Electromagnetic relay wherein response voltage is rendered tempe

Details Electromagnetic relay wherein response voltage is rendered tempe Electromagnetic relay wherein response voltage is rendered tempe

1987-01-07

1988-03-01

Harris, George

Electricity: magnetically operated switches, magnets, and electr

Magnets and electromagnets

With magneto-mechanical motive device

335 78, 335229, H01F 708

Patent

active

047289171

ABSTRACT:
A relay includes a permanent magnet for an armature restoring force having a highly negative temperature coefficient of remanence, where a portion of the permanent magnetic force is compensated by a compensation spring. The response voltage is rendered temperature independent by a heating means connected in parallel to the excitation winding to heat the permanent magnet in synchronization with the winding and, thus, guarantee a compensation of the response voltage with respect to the coil heating.

REFERENCES:
patent: 2863103 (1958-12-01), Tancred
patent: 2896132 (1959-07-01), Sauer
patent: 3317871 (1967-05-01), Adams
patent: 3522564 (1970-08-01), Mori et al.
patent: 3634793 (1972-01-01), Sauer
patent: 4568207 (1986-02-01), Hara et al.

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