Detection of rotor side anomaly in an induction machine
AssigneeGeneral Electric Company
InventorsArvind Kumar Tiwari, Dragan Stankovic, Suryavalli Uppuluri, Arijit Banerjee
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Abstract
A method for detecting an anomaly in an induction machine includes obtaining or receiving a signal from the induction machine; processing the signal so as to obtain a low frequency signal, then rectifying the low frequency signal; and, declaring if the anomaly is present, based on the rectified low frequency signal. A system for detecting anomalies is also disclosed. The present invention has been described in terms of specific embodiment(s), and it is recognized that equivalents, alternatives, and modifications, aside from those expressly stated, are possible and within the scope of the appending claims.
Claims11
A method of detecting an anomaly in a rotor of an induction machine comprising:
- obtaining or receiving a signal from the induction machine;
- processing the signal thereby obtaining a low frequency signal,
- rectifying the low frequency signal;
- and
- declaring if the anomaly is present, based on the rectified low frequency signal.
A system for determining an anomaly in a rotor of a machine, comprising:
- a device module to the machine and configured to measure characteristics of the machine, the device comprising a memory, wherein the memory comprises instructions for:
- obtaining or receiving a signal from the induction machine;
- processing the signal thereby obtaining a low frequency signal,
- rectifying the low frequency signal;
- and
- declaring if the anomaly is present, based on the rectified low frequency signal.
A method of detecting an anomaly in an induction machine, comprising:
- calculate one of instantaneous power, positive, negative, and cross-coupled volt-ampere of the induction machine;
- compute an envelope of the one of instantaneous power, positive, negative, and cross-coupled volt-ampere;
- down-sample the envelope;
- calculate direct current from a signal;
- subtract the direct current from the signal;
- one of:
- compute a root mean square;
- add a top and bottom envelope signal and finding an average of an absolute magnitude of the signals;
- and
- conduct a fft of the signal.
A method of detecting an anomaly in an induction machine, comprising:
- acquiring a three-phase voltage and current from the induction machine;
- calculating instantaneous positive sequence voltage and current;
- calculating instantaneous impedance;
- one of:
- calculate fft and search for low frequency component;
- and
- compute profile and compute root mean square and average computation.
A method of detecting an anomaly in an induction machine comprising:
- detecting at least one signal originated from the induction machine, wherein the at least one signal signifies an anomaly;
- processing the at least one signal comprising one of:
- removing of dc and high frequency signals from the at least one signal;
- and
- using a peak detector to get a profile of a fault signature;
- and
- declaring of fault of the at least one signal.
Dependencies are inferred from the claim text.