US4722226A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acoustic monitor for rotary electrical machinery
Assignee: Electric Power Research Institute
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Filing: 1986-04-10
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Granted: 1988-02-02
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Expires: 2006-04-10
Abstract
Abstract Loose field windings in a rotating electrical machine are detected by sensing acoustic waves created by stator bars and stator wedges. A sensor is mounted on the rotor which responds to sensed acoustic waves by generating an electrical signal. The signal is suitably conditioned and transmitted by telemetry means to a computer for processing.
Inventors
- 👤 James S. Edmonds
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:50
CPC Classifications
G; G01; G01N; G01N29/00; G01N29/14; G01H; G01H1/00; G01H1/003; G01H3/00; G01H3/04; G01H3/06
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
68 words
In rotating electrical machinery including a stator and a rotor mounted for rotation in the stator, a method of detecting loose stator windings comprising the steps of mounting an acoustic sensor on said rotor and positioned to receive acoustic waves from said stator, generating electrical signals in response to acoustic waves from said stator, and analyzing said electrical signals to determine acoustic noise created by a loose winding.
Claim 2
Dependent Claim
68 words
In rotating electrical machinery including a stator and a rotor mounted for rotation in the stator, a method of detecting loose stator windings comprising the steps of mounting an acoustic sensor on said rotor and positioned to receive acoustic waves from said stator, generating electrical signals in response to acoustic waves from said stator, and analyzing said electrical signals to determine acoustic noise created by a loose winding.
Claim 3
Dependent Claim
31 words
The method as defined by claim 1 wherein said step of analyzing said electrical signals includes providing computer means and transmitting said electrical signals to said computer means by telemetry means.
Claim 4
Dependent Claim
30 words
The method as defined by claim 1 and further including the step of generating a mark signal at the beginning of each revolution of said rotor for stator position identification.
Claim 5
Dependent Claim
92 words
An acoustic monitor for detecting stator coil movement in a rotary electrical machine having a stator and a rotor, said monitor comprising an acoustic sensor mounted to said rotor and oriented to receive acoustic waves from said stator and generate an electrical signal in response thereto signal amplification and drive circuitry for receiving, amplifying and converting said electrical signal for transmission, telemetry means for transmitting the electrical signal from said signal amplification and drive circuitry, and computer means for receiving the transmitted signal and identifying acoustic noise from a moving stator coil.
Claim 6
Dependent Claim
92 words
An acoustic monitor for detecting stator coil movement in a rotary electrical machine having a stator and a rotor, said monitor comprising an acoustic sensor mounted to said rotor and oriented to receive acoustic waves from said stator and generate an electrical signal in response thereto signal amplification and drive circuitry for receiving, amplifying and converting said electrical signal for transmission, telemetry means for transmitting the electrical signal from said signal amplification and drive circuitry, and computer means for receiving the transmitted signal and identifying acoustic noise from a moving stator coil.
Claim 7
Dependent Claim
44 words
The acoustic monitor as defined by claim 4 and further including a plurality of sensors and signal amplification and drive circuitry, multiplexer means for selectively applying signals to said telemetry means, and control means responsive to said computer means for controlling said multiplexer means.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1991-02-01 | 1991-08-03 | 1992-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-02-01 | 1995-08-03 | 1996-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-02-01 | 1999-08-03 | 2000-02-02 | $7700.00 | Window Closed / Lapsed |