Method and apparatus for generating motor current spectra to enhance motor system fault detection
- Knoxville, TN
- Oak Ridge, TN
A method and circuitry 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.
- Research Organization:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- DOE Contract Number:
- AC05-84OR21400
- Assignee:
- Martin Marietta Energy Systems, Inc. (Oak Ridge, TN)
- Patent Number(s):
- US 5461329
- OSTI ID:
- 870131
- Country of Publication:
- United States
- Language:
- English
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apparatus
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fault
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sampling
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nonstationary
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frequencies
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improved
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exact
cycles
defining
rate
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containing
stationary
waves
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conditioning
adjust
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discrete
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harmonics
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motor current
data set
current signal
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amplitude modulation
sampling rate
signature analysis
current data
current signature
frequency distribution
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