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Title: Method and apparatus for generating motor current spectra to enhance motor system fault detection

A method and circuitry are disclosed for sampling periodic amplitude modulations in a nonstationary periodic carrier wave to determine frequencies in the amplitude modulations. The method and circuit are described in terms of an improved motor current signature analysis. The method insures that the sampled data set contains an exact whole number of carrier wave cycles by defining the rate at which samples of motor current data are collected. The circuitry insures that a sampled data set containing stationary carrier waves is recreated from the analog motor current signal containing nonstationary carrier waves by conditioning the actual sampling rate to adjust with the frequency variations in the carrier wave. After the sampled data is transformed to the frequency domain via the Discrete Fourier Transform, the frequency distribution in the discrete spectra of those components due to the carrier wave and its harmonics will be minimized so that signals of interest are more easily analyzed. 29 figs.
Inventors:
; ;
Issue Date:
OSTI Identifier:
119035
Assignee:
Martin Marietta Energy Systems, Inc., Oak Ridge, TN (United States) PTO; SCA: 240200; PA: EDB-95:147606; SN: 95001477066
Patent Number(s):
US 5,461,329/A/
Application Number:
PAN: 8-218,966
Contract Number:
AC05-84OR21400
Resource Relation:
Other Information: PBD: 24 Oct 1995
Research Org:
Lockheed Martin Energy Syst Inc
Country of Publication:
United States
Language:
English
Subject:
24 POWER TRANSMISSION AND DISTRIBUTION; ELECTRIC MOTORS; FREQUENCY MODULATION; ENERGY SPECTRA; ELECTRONIC CIRCUITS; MEASURING METHODS; DATA ANALYSIS; ELECTRICAL FAULTS; DETECTION; SIGNAL CONDITIONING

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