System and method for measuring and analyzing electrical signals on the shaft of a machine
First Claim
1. An apparatus for monitoring electrical signals appearing on a rotating shaft, comprising:
- a probe for electrically engaging the rotating shaft and producing a probe signal corresponding to the electrical signals appearing on the rotating shaft;
an analog circuit for receiving the probe signal and operating in at least first and second modes of operation for producing first and second mode signals, respectively, corresponding to first and second parameters, respectively, of the probe signal;
analog control circuitry responsive to analog control signals for switching the analog circuit between the first and second modes of operation; and
a microprocessor based analyzer for selecting and receiving one of the first and second mode signals, for analyzing the first and second mode signals, for storing data corresponding to the first and second mode signals, and for producing and transmitting the analog control signals to the analog circuit to select a first or second mode of operation of the analog circuit.
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Abstract
The present invention provides a system and method for monitoring an electrical signal appearing on a rotating machine shaft. The system comprises a probe assembly for placement against the rotating machine shaft that is in electrically conductive contact with the shaft. The probe assembly includes at least one circuit for receiving the electrical signal from the rotating machine shaft and producing various electrical signals that are read by a data processing system, which is coupled to the circuit. The data processing system determines from the electrical signal obtained from the circuit, the RMS AC voltage, DC voltage, peak voltage, and the RMS AC and DC current through two different resisters that are all appearing on the rotating machine shaft. The data processing system also performs Fast Fourier Transforms on the RMS voltage and current signals and produces a frequency spectrum over time.
108 Citations
17 Claims
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1. An apparatus for monitoring electrical signals appearing on a rotating shaft, comprising:
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a probe for electrically engaging the rotating shaft and producing a probe signal corresponding to the electrical signals appearing on the rotating shaft; an analog circuit for receiving the probe signal and operating in at least first and second modes of operation for producing first and second mode signals, respectively, corresponding to first and second parameters, respectively, of the probe signal; analog control circuitry responsive to analog control signals for switching the analog circuit between the first and second modes of operation; and a microprocessor based analyzer for selecting and receiving one of the first and second mode signals, for analyzing the first and second mode signals, for storing data corresponding to the first and second mode signals, and for producing and transmitting the analog control signals to the analog circuit to select a first or second mode of operation of the analog circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A system for monitoring an electrical signal appearing on a rotating machine shaft, the system comprising:
a probe assembly for placement against the rotating machine shaft and in electrically conductive contact therewith, the probe assembly including a circuit comprising; a signal-in port having an input in electrical communication with the electrical signal from the rotating machine shaft, and an output; an amplifier having an input coupled to the signal-in port output for amplifying the electrical signal from the rotating machine shaft and producing an amplified electrical signal, and an output; a signal-out port having an input and an output; an analog switch coupled between the signal-out port input and the amplifier output for receiving the amplified electrical signal from the amplifier and switching the amplified electrical signal to the signal-out port; and a data processing system having an input in electrical communication with the signal-out port output for receiving the amplified electrical signal, computing Fast Fourier Transforms on the amplified electrical signal. - View Dependent Claims (10, 11, 12)
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13. A system for monitoring an electrical signal appearing on a rotating machine shaft, the system comprising:
a probe assembly for placement against the rotating machine shaft and in electrically conductive contact therewith, the probe assembly including a circuit comprising; a signal-in port having an input in electrical communication with the probe assembly for receiving the electrical signal from the rotating machine shaft, and an output; a peak detector having an input in electrical communication with the signal-in port output for sampling and holding the electrical signal from the rotating machine shaft and producing a peak voltage signal corresponding to peak voltage on the rotating machine shaft, and an output; and a signal-out port having an output, and an input coupled to the peak detector output. - View Dependent Claims (14, 15, 16, 17)
Specification