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《Electrical Machinery Technology》 2006-04
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Simulation of Adaptive Notch Filter do Detect Rotor Bar Breaking in Induction Motors

Liu Laibin Zhang Tingyuan Zhou Feng Harbin Univesity of Stience & Technology Binzhou Bohai Piston Co.Ltd.,Shandong  
Rotor bar breaking is a common fault in the squirrel-cage motors. At present the most widely used detecting method for rotor bar breaking is frequency spectrum analysis of stator current by Fast Fourier Transform (FFT).but low sensitivity is the disadvantage of this method. There is a very small additional current component of frequency in the stator current signal when motor has broken rotor bars, in case that the frequency spectrum analysis is carried out directly,because the line frequency component with large amplitude will influence on this result. In this paper, adaptive notch filter is applied to process the signals of the stator current in induction motors. Two parameters of the adaptive notch filter will be adjusted by LMS algorithm in order to attenuate the line frequency component greatly. Though this method can not eliminate the line frequency component completely,the amplitude will be reduced evidently. The result is a great help to extract the feature component of rotor fault and improve the sensitivity of fault diagnosis. The simulation show that the method is valid and effective.
【CateGory Index】: TM343
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Chinese Journal Full-text Database 1 Hits
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