Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Analysis of complex waves
Patent
1989-08-31
1990-12-18
Williams, Hezron E.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Analysis of complex waves
324158MG, G01R 2316
Patent
active
049789090
ABSTRACT:
A motor current analysis method for the remote, noninvasive inspection of electric motor-operated systems. Synchronous amplitude demodulation and phase demodulation circuits are used singly and in combination along with a frequency analyzer to produce improved spectral analysis of load-induced frequencies present in the electric current flowing in a motor-driven system.
REFERENCES:
patent: 4123009 (1978-10-01), Kilpinen
patent: 4303882 (1981-12-01), Wolfinger
patent: 4380172 (1983-04-01), Iman et al.
patent: 4527101 (1985-07-01), Zavis et al.
patent: 4542649 (1985-09-01), Charbonneau et al.
patent: 4678990 (1987-07-01), Bicknell et al.
patent: 4744041 (1988-05-01), Strunk et al.
patent: 4773263 (1988-09-01), Lesage
Hargis et al., "The Detection of Rotor Defects in Induction Motors", IEE conf. Publ. 213, 1982, pp. 216-220.
Steele et al., "An Electrical Method of Monitoring Motors," ibid, 1982, pp. 231-235.
Franklin Research Center Report entitled "AM and FM Digital Modulation Technique for Electric Power," dated Feb. 1984.
Tavner et al., "Monitoring Generators and Large Motors," IEE Proceedings, vol. 133, Pt.B, No. 3, May 1986, pp. 169-180.
Patent Application Ser. No. 06/913,193, Howard D. Haynes et al., "Motor Current Signature Analysis Method for Diagnosing Motor Operating Devices," filed 09/30/86, pending as of 12/19/89.
Thomson et al., "An On-Line, Computer-Based Current Monitoring System for Rotor Fault Diagnosis in 3-Phase Induction Motors," reprinted from the Nov-Dec 1987 edition of Turbomachinery International, pp. 17-24.
Brochure entitled, "Induction Motor Fault Diagnosis," produced by Entek Scientific Corporation (Date unknown).
Hendrix Donald E.
Smith Stephen F.
Arana Louis M.
Martin Marietta Energy Systems Inc.
Spicer James M.
Williams Hezron E.
Winchell Bruce M.
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