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

fYear

2010

fDate

6-8 Sept. 2010

Firstpage

1

Lastpage

6

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;

fLanguage

English

Publisher

ieee

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

Type

conf

DOI

10.1109/ICELMACH.2010.5607699

Filename

5607699