Acoustic monitor for rotary electrical machinery
First Claim
1. 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 ofmounting 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, andanalyzing said electrical signals to determine acoustic noise created by a loose winding.
1 Assignment
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Accused Products
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.
13 Citations
5 Claims
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1. 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.
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4. 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.
Specification