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US5689194A
Expired / Lapsed
US
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Acoustic motor current signature analysis system with audio amplified speaker output
Assignee: Framatome Technologies Inc
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Filing: 1996-04-19
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Granted: 1997-11-18
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Expires: 2016-04-19
Abstract
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.
Inventors
- 👤 II Reginald D. Richards
- 👤 Robert T. Proffitt
- 👤 Anthony F. Lexa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:40
CPC Classifications
G; G01; G01R; G01R31/00; G01R31/34; G01R31/343
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
141 words
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.
Claim 2
Dependent Claim
141 words
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.
Claim 3
Dependent Claim
26 words
The apparatus according to claim 1 wherein said means for selecting a portion of said motor current noise signal further includes at least one digital filter.
Claim 4
Dependent Claim
14 words
The apparatus according to claim 2 wherein said digital filters are switched capacitor filters.
Claim 5
Dependent Claim
13 words
The apparatus according to claim 2 wherein said digital filters are computer controlled.
Claim 6
Dependent Claim
15 words
The apparatus according to claim 1 wherein said motor current sensor is a current transformer.
Claim 7
Dependent Claim
105 words
A signal processor for a motor current signature analysis system comprising: (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.
Claim 8
Dependent Claim
105 words
A signal processor for a motor current signature analysis system comprising: (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.
Claim 9
Dependent Claim
14 words
The apparatus according to claim 6 wherein said signal translator is a heterodyne circuit.
Claim 10
Dependent Claim
25 words
The apparatus according to claim 6 wherein said heterodyne circuit multiplies said selected frequencies of said motor current noise signal with a sine wave oscillator.
Claim 11
Dependent Claim
17 words
The apparatus according to claim 6 further comprising a recorder for recording said motor current noise signal.
Claim 12
Dependent Claim
23 words
The apparatus according to claim 6 wherein said demodulator uses a demodulation technique selected from the group consisting of amplitude and phase demodulation.
Claim 13
Dependent Claim
14 words
The apparatus according to claim 6 wherein said filters are controllable by a computer.
Claim 14
Dependent Claim
164 words
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 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.
Claim 15
Dependent Claim
164 words
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 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.
Claim 16
Dependent Claim
14 words
The apparatus according to claim 12 wherein said digital filters are switched capacitor filters.
Claim 17
Dependent Claim
13 words
The apparatus according to claim 12 wherein said digital filters are computer controlled.
Claim 18
Dependent Claim
15 words
The apparatus according to claim 12 wherein said motor current sensor is a current transformer.
Claim 19
Dependent Claim
14 words
The apparatus according to claim 12 wherein said signal translator is a heterodyne circuit.
Claim 20
Dependent Claim
25 words
The apparatus according to claim 12 wherein said heterodyne circuit multiplies said selected frequencies of said motor current noise signal with a sine wave oscillator.
Claim 21
Dependent Claim
21 words
The apparatus according to claim 12 further comprising a data recorder for recording said motor current and motor current noise signal.
Claim 22
Dependent Claim
23 words
The apparatus according to claim 12 wherein said demodulator uses a demodulation technique selected from the group consisting of amplitude and phase demodulation.
Claim 23
Dependent Claim
14 words
The apparatus according to claim 12 wherein said filters are controllable by a computer.
Claim 24
Dependent Claim
17 words
The apparatus according to claim 1 wherein said motor current sensor is a hall effect current sensor.
Claim 25
Dependent Claim
17 words
The apparatus according to claim 12 wherein said motor current sensor is a hall effect current sensor.
Claim 26
Independent Claim
162 words
A method for analyzing a motor current signature, said method comprising the steps of: (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.
Claim 27
Independent Claim
162 words
A method for analyzing a motor current signature, said method comprising the steps of: (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.
Claim 28
Independent Claim
118 words
A method for signal processing for analyzing a motor current signature, said method comprising the steps of: (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.
Claim 29
Independent Claim
118 words
A method for signal processing for analyzing a motor current signature, said method comprising the steps of: (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.
Claim 30
Independent Claim
184 words
A method for analyzing a motor current signature, said method comprising the steps of: (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.
Claim 31
Independent Claim
184 words
A method for analyzing a motor current signature, said method comprising the steps of: (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.
References Cited (Backward Citations)
US4413325A
Cited
US4678990A
Cited
US4965513A
Cited
US4978909A
Cited
US4922195A
Cited
US5333240A
Cited
US5137029A
Cited
US5200816A
Cited
US5216337A
Cited
US5365158A
Cited
US5233354A
Cited
US5420523A
Cited
US5578937A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-11-17 | 2001-05-19 | 2001-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-11-17 | 2005-05-19 | 2005-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-11-17 | 2009-05-19 | 2009-11-18 | $7700.00 | Window Closed / Lapsed |