Electricity: magnetically operated switches – magnets – and electr – Electromagnetically actuated switches – Multiple contact type
Patent
1983-04-19
1985-12-17
Goldberg, E. A.
Electricity: magnetically operated switches, magnets, and electr
Electromagnetically actuated switches
Multiple contact type
335281, 200144B, 336212, H01H 5108
Patent
active
045595119
ABSTRACT:
A vacuum contactor having a compact DC electromagnet with an improved force watts ratio. The DC electromagnet consisting of a dual pickup coil and holding coil winding assembly and a solid U-shaped core having removable legs secured to a base with an adhesive backed aluminum shim positioned intermediate the legs and base, the ampere turns of the pickup coil being approximately 7.5 times those of the holding coil with the legs of the core being approximately 1/3 the length of those in a conventional DC electromagnet having substantially the same force watts ratio. The shorter legs of the core reduce magnetic losses and provide increased magnetic coupling with the moving armature of the contactor closing mechanism. This allows the smaller magnet to exert a greater force upon the armature during closing of the vacuum interrupter. With decreased magnetic losses, the size of the windings can be reduced, facilitating removal of the heat generated therein and producing a small, efficient magnet.
REFERENCES:
patent: 3188427 (1965-06-01), Cooper et al.
patent: 3330994 (1967-07-01), Kissy
patent: 3553617 (1971-01-01), Turnbull et al.
patent: 4223289 (1980-09-01), Immel
Basnett Robert T.
Bratkowski Walter V.
Andrews George
Goldberg E. A.
Pezdek John Victor
Westinghouse Electric Corp.
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