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Motor Faults Detection Based on Vector Transformation and Amplitude Demodulation

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Abstract:

A method to analyze and detect the features of rotor and stator asymmetric faults for AC motor is put forward in this paper. After modeling the damaged asynchronous motor, stator’s three-phase current signals of the motor at normal status, as well as that with stator and rotor bar asymmetric faults, are simulated and analyzed qualitatively. In view of the shortcomings of Park’s vector transformation in the analyzing motor current signature, a method is put forward by combining it with signal amplitude demodulation. Based on this new method, the asymmetric features are expected to be extracted completely through the amplitude relative normalization and spectrum analysis. Finally, the availability of this method is verified by detecting and diagnosing the faults in actual AC motors.

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Periodical:

Applied Mechanics and Materials (Volume 628)

Pages:

219-224

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.628.219

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Online since:

September 2014

Authors:

Guo Jun Qin*, Jun Yao Li, Jian Mei Chen, Niao Qing Hu

Keywords:

Ac Motor, Amplitude Demodulation, Asymmetric Fault, Modeling, Simulation, Vector Transformation

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© 2014 Trans Tech Publications Ltd. All Rights Reserved

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* - Corresponding Author

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