Electricity: measuring and testing – Magnetic – Displacement
Patent
1990-04-20
1992-02-04
Wieder, Kenneth A.
Electricity: measuring and testing
Magnetic
Displacement
116277, 137554, 324226, G01B 714, F16K 3700
Patent
active
050862731
ABSTRACT:
A system to determine the position of an electrically conductive element movably positioned in a housing, like a metal disc in a check valve, includes an A.C. electromagnet positioned in close proximity to the valve casing and the disc. The magnet is excited with an A.C. voltage to generate a magnetic field which penetrates the casing and the disc. The magnetic field is detected by a sensor. A.C. current and voltage signals from the electromagnet and a magnetic field signal from the sensor are presented to a processor portion of the system. The processor portion digitizes, amplitude and phase modulates each of the three signals and generates four traces: A.C. current amplitude, magnetic field amplitude, A.C. current phase and magnetic field phase. The latter two traces are derived with respect to an A.C. voltage phase signal. Comparable baseline signals previously gathered for the valve are stored. One to four of the traces are displayed, with or without the corresponding baseline trace, for determination of disc position.
REFERENCES:
patent: 3017621 (1962-01-01), Taborsky
patent: 3602254 (1971-08-01), Fawkes
patent: 3859619 (1975-01-01), Ishihara et al.
patent: 3914994 (1975-10-01), Banner
patent: 4429578 (1984-02-01), Darrel et al.
patent: 4498495 (1985-02-01), Worwood et al.
patent: 4507976 (1985-04-01), Banko
patent: 4523286 (1985-06-01), Koga et al.
patent: 4535629 (1985-08-01), Prine
patent: 4573114 (1986-02-01), Ferguson et al.
patent: 4618824 (1986-10-01), Magee et al.
patent: 4636780 (1987-01-01), Thomas et al.
patent: 4711266 (1987-12-01), Leiber
patent: 4737774 (1988-04-01), Chapman et al.
patent: 4777979 (1988-10-01), Twerdochlib
patent: 4833453 (1989-05-01), Twevdochlib
patent: 4849655 (1989-07-01), Bennett
patent: 4914388 (1990-04-01), Kalista et al.
patent: 4977778 (1990-12-01), Nafziger et al.
Document entitled, "Application Guidelines for Check Valves in Nuclear Power Plants", Electric Power Research Institute Project 2233-20, Final Report, Jan., 1988; cover & pp. 4-1 to 4-10 and 5-1 and 5-18.
Document entitled, "Significant Operating Experience Report", Institute of Nuclear Power Operations, Atlanta, Ga., Oct. 1986 (13 pages).
Document entitled, "Performance Monitoring of Swing Check Valves Using Magnetic Flux Signature Analysis", Information Package Containing Selected MFSA Test Results, Haynes, H. D., Eissenberg, D. M., May, 1989 (10 pages).
Edmonds W. S.
Liberty Technology Center, Inc.
Wieder Kenneth A.
LandOfFree
A.C. electromagnetic system for determining position of an encas does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with A.C. electromagnetic system for determining position of an encas, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A.C. electromagnetic system for determining position of an encas will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-349423