Method for incipient failure detection in electric machines

Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – With rotor

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36455101, G01R 2100

Patent

active

052706400

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.

REFERENCES:
patent: 4377784 (1983-03-01), Saito et al.
patent: 4914386 (1990-04-01), Zocholl
patent: 5126678 (1992-06-01), William
"Alternatives for assessing the electrical integrity of induction motors", Conference Record of the 1989 IEEE Industry Applications Society Annual Meeting Part II., Kohler et al, pp. 1580-1586, Oct. 1-5, 1989.

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