Abstract
The aim of this work is to find out, through the analysis of the time and frequency domains, significant differences that lead us to obtain one or several variables that may result in an indicator that allows diagnosing the condition of the rotor in an induction motor from the processing of the stray flux signals. For this, the calculation of two indicators is proposed: the first is based on the frequency domain and it relies on the calculation of the sum of the mean value of the bispectrum of the flux signal. The use of high order spectral analysis is justified in that with the one-dimensional analysis resulting from the Fourier Transform, there may not always be solid differences at the spectral level that enable us to distinguish between healthy and faulty conditions. Also, based on the high-order spectral analysis, differences may arise that, with the classical analysis with the Fourier Transform, are not evident, since the high order spectra from the Bispectrum are immune to Gaussian noise, but not the results that can be obtained using the one-dimensional Fourier transform. On the other hand, a second indicator based on the temporal domain that is based on the calculation of the square value of the median of the autocovariance function of the signal is evaluated. The obtained results are satisfactory and let us conclude the affirmative hypothesis of using flux signals for determining the condition of the rotor of an induction motor.
Highlights
IntroductionIn the electric motor condition monitoring area, there is a continuous search for new techniques that are able to enhance the performance and to avoid the drawbacks of the currently existing ones
In the electric motor condition monitoring area, there is a continuous search for new techniques that are able to enhance the performance and to avoid the drawbacks of the currently existing ones.In this context, the analysis of alternative machine quantities is being explored, as a way to complement the information provided by the well-known methods that are widespread in the industry
For the detection of the healthy and the damaged state conditions of an induction motor, an algorithm based on the sum of the mean value of the bispectrum absolute values ( BxN−mean ( f )) of the flux signal is proposed
Summary
In the electric motor condition monitoring area, there is a continuous search for new techniques that are able to enhance the performance and to avoid the drawbacks of the currently existing ones. In this context, the analysis of alternative machine quantities is being explored, as a way to complement the information provided by the well-known methods that are widespread in the industry (currents and vibrations). Fault diagnosis and processing techniques based on stray flux signals are completely non-invasive and their set up is relatively simple, the application of this approach requires a specific sensor and a priori knowledge of the Energies 2019, 12, 597; doi:10.3390/en12040597 www.mdpi.com/journal/energies
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