Title :
Rotor fault detection of induction motors by sensorless irregularity revolution analysis
Author :
Jaksch, Ivan ; Zalud, Jan
Author_Institution :
Fac. of Mechatron., Tech. Univ. of Liberec, Liberec, Czech Republic
Abstract :
Dynamic rotor faults of induction machines as broken bars and rotor eccentricity cause dynamic changes in the rotor electromagnetic field and therefore also in magnetomotive force. These changes in the electromagnetic field cause motor current amplitude and phase modulation. The rotating electromagnetic field has not a stable angular frequency but oscillates around its angular frequency. The phase demodulation of the stator current can reveal the irregularities in magnetomotive force. The phase demodulation based on the complex analytical signal enables the sensorless determination of instantaneous electromagnetic field phase angle and instantaneous angular speed and can serve as a general tool for an irregularity revolution analysis or as a diagnostic tool for rotor faults.
Keywords :
amplitude modulation; fault diagnosis; induction motors; phase modulation; rotors; stators; broken bars; induction motors; instantaneous angular speed; instantaneous electromagnetic field phase angle; magnetomotive force; motor current amplitude modulation; phase modulation; rotor eccentricity; rotor fault detection; sensorless irregularity revolution analysis; stator current; Bars; Demodulation; Frequency modulation; Oscillators; Phase modulation; Rotors; Stators; Hilbert transform; demodulation; fault currents; fault diagnosis; induction motors; phase detection; phase modulation; signal processing; space transform; spectral analysis;
Conference_Titel :
Electrical Machines (ICEM), 2010 XIX International Conference on
Conference_Location :
Rome
Print_ISBN :
978-1-4244-4174-7
Electronic_ISBN :
978-1-4244-4175-4
DOI :
10.1109/ICELMACH.2010.5607699
