Ov. Thorsen et M. Dalva, METHODS OF CONDITION MONITORING AND FAULT-DIAGNOSIS FOR INDUCTION-MOTORS, European transactions on electrical power, 8(5), 1998, pp. 383-395
The study gives a synopsis over condition monitoring methods both as a
diagnostic tool and as a technique for failure identification in high
-voltage induction motors. Methods of fault detection are reviewed and
analyzed: mechanical (vibrations, shock pulses, acoustic, speed fluct
uations), electro-mechanical (currents, surges, partial discharges, le
akage fluxes) and temperature-, oil particle-, gas analysis, and perfo
rmance- and visual methods. The study indicates how different types of
faults generate different frequency components in vibration spectra,
in motor supply current, in torque and in magnetic field, and relation
ships between fault types and spectra have been developed. Supply curr
ent waveform analysis has been applied to demonstrate the detection of
broken rotor bars and bearing faults.