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A Fault Diagnosis Approach for Broken Rotor Bars Based on EMD and Envelope Analysis 被引量:5

A Fault Diagnosis Approach for Broken Rotor Bars Based on EMD and Envelope Analysis
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摘要 Empirical Mode Decomposition (EMD) used to deal with non-linear and non-stable signals,is a time-frequency analytical method that has been developed recently. In this paper the EMD method is used to filter the noise from the stator current signal that arises when rotor bars break. Then a Hilbert Transform is used to extract the envelope from the filtered signal. With the EMD method again,the frequency band containing the fault characteris-tic-frequency components,2sf,can be extracted from the signal's envelope. The last step is to use a Fast Fourier Trans-form (FFT) method to extract the fault characteristic frequency. This frequency can be detected in actual data from a faulty motor,as shown by example. Compared to the Extend Park Vector method this method is proved to be more sen-sitive under light motor load. Empirical Mode Decomposition (EMD) used to deal with non-linear and non-stable signals, is a time-frequency analytical method that has been developed recently. In this paper the EMD method is used to filter the noise from the stator current signal that arises when rotor bars break. Then a Hilbert Transform is used to extract the envelope from the filtered signal. With the EMD method again, the frequency band containing the fault characteristic-frequency components, 2sf, can be extracted from the signal's envelope. The last step is to use a Fast Fourier Transform (FFT) method to extract the fault characteristic frequency. This frequency can be detected in actual data from a faulty motor, as shown by example. Compared to the Extend Park Vector method this method is proved to be more sensitive under light motor load.
出处 《Journal of China University of Mining and Technology》 EI 2007年第2期205-209,共5页 中国矿业大学学报(英文版)
基金 Projects 50504015 supported by the National Natural Science Foundation of China OC4499 by the Science Technology Foundation of China University ofMining & Technology
关键词 EMD analysis of envelope fault of broken rotor bar 故障诊断 经验模型分解 转子铜条 电机 包络分析
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参考文献3

  • 1Li Z,Chen X C,Liu Z B.Envelopment analysis and its application in the fault diagnosis[].Journal of Test and Measurement Technology.2002
  • 2Tan S W.The Research of Hilbert-Huang Transform Based on Multi-resolution Analysis [Ph.D. Dissertation][]..2001
  • 3Mejjarih,Benbouzid M.Monitoring and diagnosis of induction motors electrical faults using a current Park’s vector pattern learning approach[].IEEE Transactions on Industry Applications.2000

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