Method and apparatus for generating motor current spectra to enhance motor system fault detection
Patent
·
OSTI ID:870131
- 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:
- LOCKHEED MARTIN ENRGY SYST INC
- 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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Related Subjects
/324/702/
adjust
amplitude
amplitude modulation
analog
analysis
analyzed
apparatus
carrier
carrier wave
circuit
circuitry
collected
components
conditioning
containing
contains
current
current data
current signal
current signature
current spectra
cycles
data
data set
defining
described
detection
determine
discrete
distribution
domain
due
easily
enhance
exact
fault
fault detection
fourier
fourier transform
frequencies
frequency
frequency distribution
frequency domain
generating
harmonics
improved
insures
method
minimized
modulations
motor
motor current
nonstationary
periodic
rate
recreated
sampled
samples
sampling
sampling rate
set
signal
signals
signature
signature analysis
spectra
stationary
terms
transform
transformed
variations
via
wave
waves
adjust
amplitude
amplitude modulation
analog
analysis
analyzed
apparatus
carrier
carrier wave
circuit
circuitry
collected
components
conditioning
containing
contains
current
current data
current signal
current signature
current spectra
cycles
data
data set
defining
described
detection
determine
discrete
distribution
domain
due
easily
enhance
exact
fault
fault detection
fourier
fourier transform
frequencies
frequency
frequency distribution
frequency domain
generating
harmonics
improved
insures
method
minimized
modulations
motor
motor current
nonstationary
periodic
rate
recreated
sampled
samples
sampling
sampling rate
set
signal
signals
signature
signature analysis
spectra
stationary
terms
transform
transformed
variations
via
wave
waves