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

A method for determining the position of an armature of a dc-powered solenoid is disclosed. 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. 5 figs.
Inventors:
;
Issue Date:
OSTI Identifier:
415767
Assignee:
Martin Marietta Energy Systems, Inc., Oak Ridge, TN (United States) PTO; SCA: 440800; PA: EDB-97:016255; SN: 97001714610
Patent Number(s):
US 5,583,434/A/
Application Number:
PAN: 8-093,846
Contract Number:
AC05-84OR21400
Resource Relation:
Other Information: PBD: 10 Dec 1996
Research Org:
Lockheed Martin Energy Syst Inc
Country of Publication:
United States
Language:
English
Subject:
44 INSTRUMENTATION, INCLUDING NUCLEAR AND PARTICLE DETECTORS; ARMATURES; MONITORING; SOLENOIDS; ELECTRIC MEASURING INSTRUMENTS; DESIGN; DC SYSTEMS; POSITIONING; ELECTRIC CONDUCTIVITY; MEASURING METHODS

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