H - Electricity – 01 – H
Patent
H - Electricity
01
H
306/215, 306/93
H01H 51/08 (2006.01) H01F 7/08 (2006.01) H01H 47/04 (2006.01) H01H 50/36 (2006.01) H01H 33/02 (2006.01) H01H 33/66 (2006.01)
Patent
CA 1222537
19 50,452 ABSTRACT OF THE DISCLOSURE A vacuum contactor having a compact DC electro- magnet with an improved force watts ratio. The DC elec- tromagnet 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.
451630
Basnett Robert T.
Bratkowski Walter V.
Oldham And Company
Westinghouse Electric Corporation
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