Method for incipient failure detection in electric machines
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United States of America Patent
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Dec 14, 1993
Grant Date -
N/A
app pub date -
Apr 23, 1992
filing date -
Apr 23, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An improved method for detecting an incipient failure in a multiphase electric motor includes the following steps: periodically measuring or continuously monitoring voltage and current values at each input to the motor; determining negative sequence voltage and current values for each periodic measured input voltage and current value; calculating an effective negative sequence impedance phasor value angle from each of the determined negative sequence voltages and current values; and comparing the calculated negative sequence impedance phasor angles and/or real and imaginary components over a plurality of periodic measurements to detect a change therein, which change is indicative of an incipient failure mode.
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