Detection of Broken Outer-Cage Bars for Double-Cage Induction Motors Under the Startup Transient

Unlike single-cage rotor fault detection, fast Fourier transform (FFT)-based steady-state spectrum analysis techniques can fail to detect outer-cage faults in double-cage induction motors due to the small outer-cage current under running conditions. Double-cage motors are typically employed in appli...

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Bibliographic Details
Published in:IEEE transactions on industry applications 2012-09, Vol.48 (5), p.1539-1548
Main Authors: Antonino-Daviu, J., Riera-Guasp, M., Pons-Llinares, J., Jongbin Park, Sang Bin Lee, Jiyoon Yoo, Kral, C.
Format: Article
Language:English
Subjects:
AC machine
Bars
condition monitoring
Discrete wavelet transforms
double-cage rotor
fast Fourier transform (FFT)
fault diagnostics
induction motor
Induction motors
motor current signature analysis (MCSA)
Oscillators
outer-cage fault
Rotors
Steady-state
Transient analysis
wavelet transform
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Summary:Unlike single-cage rotor fault detection, fast Fourier transform (FFT)-based steady-state spectrum analysis techniques can fail to detect outer-cage faults in double-cage induction motors due to the small outer-cage current under running conditions. Double-cage motors are typically employed in applications that require loaded starts. This makes the outer cage vulnerable to fatigue failure since it must withstand the high starting current and long startup time frequently. However, there are only a few publications that investigate detection techniques specifically for double-cage motors. In this paper, considering that the influence of the faulty outer cage is strong at startup due to the large outer-cage current, detection of outer-cage faults under the startup transient is investigated. A discrete-wavelet-transform-based method is proposed as a viable solution to the detection of outer-cage faults for double-cage motors. An experimental study on fabricated copper double-cage induction motors shows that the proposed method provides sensitive and reliable detection of double-cage rotor faults compared to FFT.
ISSN:0093-9994
1939-9367
DOI:10.1109/TIA.2012.2210173