Importance

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Abstract

A d-c electromagnetic solenoid designed to open or close circuit breakers, for operating valves, and any other applications which a relatively large force is applied to a member which moves a relatively short distance through the conversion of electrical energy into optimum mechanical work from magnetic attraction. It consists of a circular stationary coil(s) of conducting wire(s) wound around a nonmagnetic spool with a hollow core in which a nonmagnetic circular bushing or guide is tightly fitted to guide the symetrical sliding motion of a mushroom or T-shaped plunger along the central axis, the plunger is of circular shaped with a diametrically enlarged step made of magnetic material designed to slide axially through the guide under the influence of the exiting coil(s), a positive stop of magnetic material, a cylindrical shell of magnetic material to carry the external flux serves as well as a housing for the assembly, a cover made of nonmagnetic material limits the upward travel of the plunger and create a large air gap in the external flux path, a spring (or any other device or air or fluid and the like) designed to hold the plunger in its original position before the excitation of the current carrying coil(s) and to return it to its original position once the coil(s) is de-energized.

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First Claim