Acoustic motor current signature analysis system with audio amplified speaker output
First Claim
1. A motor current signature analysis system comprising:
- (a) a motor current sensor for sensing motor current and providing a motor current noise signal, said sensor having an motor current noise signal output;
(b) a signal processor having a means for selecting a portion of said motor current noise signal and a means for converting said portion of said motor current noise signal into an audio signal within an audible frequency range, said signal processor having an input for receiving said motor current noise signal and an audio signal output; and
(c) an audio section including an amplifier and a speaker coupled to said amplifier, said amplifier having an input for receiving said audio signal, wherein said amplifier amplifies said audio signal and transfers the amplified audio signal to said speaker for playing said selected frequencies of said motor current noise signal.
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Accused Products
Abstract
An apparatus for monitoring and processing of motor currents to determine motor characteristics under various loads. In the preferred embodiment, the invention employs a spectrum analyzer that having a plurality of digitally controlled switched capacitor filters under control of a personal computer. Sampling of both voltage and current simultaneously allows for calculation of instantaneous motor power and power factor, which are used to monitor the motor'"'"'s performance. An acoustical output, generated under computer control is used to give the operator feedback on the motor'"'"'s operation. The output signal is derived from low frequency or infrasonic sensing and is then stepped up to a frequency that the operator can hear. This permits the analyst to "hear" the condition of the motor under load. A CRT display to show the frequency spectrum and time display.
29 Citations
25 Claims
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1. A motor current signature analysis system comprising:
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(a) a motor current sensor for sensing motor current and providing a motor current noise signal, said sensor having an motor current noise signal output; (b) a signal processor having a means for selecting a portion of said motor current noise signal and a means for converting said portion of said motor current noise signal into an audio signal within an audible frequency range, said signal processor having an input for receiving said motor current noise signal and an audio signal output; and (c) an audio section including an amplifier and a speaker coupled to said amplifier, said amplifier having an input for receiving said audio signal, wherein said amplifier amplifies said audio signal and transfers the amplified audio signal to said speaker for playing said selected frequencies of said motor current noise signal. - View Dependent Claims (2, 3, 4, 5, 21)
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6. A signal processor for a motor current signature analysis system comprising:
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(a) an input for receiving a motor current noise signal; (b) a demodulator for demodulating said motor current noise signal; (c) a signal conditioner having filters for selecting predetermined frequencies of said motor current noise and removing unwanted frequencies and harmonics from said motor current noise signal; (d) a signal translator for shifting said selected frequencies of said motor current noise signal into an audio bandwidth; and (e) an audio section having an amplifier and a speaker coupled to said amplifier for amplifying and playing said selected frequencies of said motor current noise signal. - View Dependent Claims (7, 8, 9, 10, 11)
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12. A motor current signature analysis system comprising:
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(a) a motor current sensor for sensing motor current and providing a motor current noise signal, said sensor having an motor current noise signal output; (b) a signal processor including;
(i) an input for receiving said motor current noise signal;
(ii) a demodulator for demodulating said motor current noise signal;
(iii) a signal conditioner having at least one digital filter for selecting predetermined frequencies of said motor current noise and removing unwanted frequencies and harmonics from said motor current noise signal; and
(iv) a signal translator for shifting said selected frequencies of said motor current noise signal into an audio bandwidth signal; and(c) an audio section including an amplifier and a speaker coupled to said amplifier, said amplifier having an input for receiving said audio bandwidth signal, wherein said amplifier amplifies said audio bandwidth signal and transfers the amplified audio bandwidth signal to said speaker for playing said selected frequencies of said motor current noise signal. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 22)
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23. A method for analyzing a motor current signature, said method comprising the steps of:
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(a) sensing motor current and providing a motor current noise signal by a motor current sensor, said sensor having an motor current noise signal output; (b) processing said motor current noise signal output by a signal processor having a means for selecting a portion of said motor current noise signal and a means for converting said portion of said motor current noise signal into an audio signal within an audible frequency range, said signal processor having an input for receiving said motor current noise signal and an audio signal output; and (c) amplifying said audio signal output by an audio section including an amplifier and a speaker coupled to said amplifier, said amplifier having an input for receiving said audio signal, wherein said amplifier amplifies said audio signal and transfers the amplified audio signal to said speaker for playing said selected frequencies of said motor current noise signal.
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24. A method for signal processing for analyzing a motor current signature, said method comprising the steps of:
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(a) receiving a motor current noise signal; (b) demodulating said motor current noise signal; (c) signal conditioning said motor current noise signal by a signal conditioner having filters for selecting predetermined frequencies of said motor current noise and removing unwanted frequencies and harmonics from said motor current noise signal; (d) shifting said selected frequencies of said motor current noise signal into an audio bandwidth by a signal translator; and (e) amplifying said shifted signal by an audio section having an amplifier and a speaker coupled to said amplifier for amplifying and playing said selected frequencies of said motor current noise signal.
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25. A method for analyzing a motor current signature, said method comprising the steps of:
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(a) sensing motor current and providing a motor current noise signal by a motor current sensor, said sensor having an motor current noise signal output; (b) processing said motor current noise signal output by a signal processor including;
(i) an input for receiving said motor current noise signal;
(ii) a demodulator for demodulating said motor current noise signal;
(iii) a signal conditioner having at least one digital filter for selecting predetermined frequencies of said motor current noise and removing unwanted frequencies and harmonics from said motor current noise signal; and
(iv) a signal translator for shifting said selected frequencies of said motor current noise signal into an audio bandwidth signal; and(c) amplifying said shifted signal by an audio section including an amplifier and a speaker coupled to said amplifier, said amplifier having an input for receiving said audio bandwidth signal, wherein said amplifier amplifies said audio bandwidth signal and transfers the amplified audio bandwidth signal to said speaker for playing said selected frequencies of said motor current noise signal.
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Specification