Electromagnet and method of producing the same
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorsHaruhiko Ito, Mineo Sano
Life of this patent
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Abstract
An electromagnet for use in a contactor, for example, is provided with non-magnetic thin plates fixed to either or both of the fixed and moving-iron core contacting surfaces. The plates provide good abrasion and shock resistance and prevent attraction between the fixed and moving cores due to magnetic remanence.
Claims9
In an electromagnet in which an attractive force is generated between a moving and a fixed-iron core by a d.c. current or rectified a.c. current, the improvement comprising a melt-type adhesive layer of a thermally-melting adhesive composed of an oxygen-free copper or silver solder provided on at least one contacting electrode surface of the moving-iron core and the fixed-iron core, and a thin non-magnetic plate for preventing attraction between said cores due to remanence fixed through said melt-type adhesive layer onto said contacting electrode surface.
A method of producing an electromagnet of the type wherein a movable-iron core confronting a fixed-iron core is attracted to the fixed-iron core by magnetic flux due to a current flow through a coil wound around the fixed-iron core, comprising forming a thin non-magnetic plate having a melt-type adhesive composed of an oxygen-free copper or silver solder on one surface thereof, and thermally-melting said adhesive to fix said plate on at least one contacting electrode surface of said movable-iron core and said fixed-iron core.
Dependencies are inferred from the claim text.