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Method and apparatus for monitoring armature position in direct-current solenoids

United States Patent

5,583,434
December 10, 1996
View the Complete Patent at the US Patent & Trademark Office
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A method for determining the position of an armature of a dc-powered solenoid. Electrical circuitry is provided to introduce a small alternating current flow through the coil. As a result, the impedance and resistance of the solenoid coil can be measured to provide information indicative of the armature's position.
Moyers; John C. (Oak Ridge, TN), Haynes; Howard D. (Knoxville, TN)
Martin Marietta Energy Systems, Inc. (Oak Ridge, TN)
08/ 093,846
July 20, 1993
This invention was made with Government support under contract DE-AC0-84OR21400 awarded by the U.S. Department of Energy to Martin Marietta Energy Systems, Inc. and the Government has certain rights in this invention.