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Some new fault indicators for rotor bar breakages detection in squirrel cage induction motors have been theoretically previewed and experimentally proved. They are based on the sidebands of phase current upper harmonics, and they are well suited for converter-fed induction motors. The ratios I(7-2delta)f/I5f and I(5+2s)f/I7f are examples of such new indicators, and they are not dependent on load torque...
In a companion paper (Part I) the bar breakages for a 1.13 MW induction motor used in high speed railway traction drives were studied, by simulating the whole system (converter + motor) and by analyzing frequencies and amplitudes of current sidebands, for various loads (both active and inertial) and with increasing fault severity. It was recognized that faults can be characterized by (1-2s)f sideband,...
In this paper the rotor bar fault diagnosis problem for a particular induction motor (1.13 MW) employed in high speed-railway traction is considered, by getting realistic simulations of the electromechanical converter behaviour in specified working and feeding conditions. The use of a complete motor phase model and the implementation of the real GTO-inverter waveforms (three-pulses PWM modulation)...
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