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Study on rotor broken-bar fault in induction motors based on spectrum analysis of Hilbert modulus(PDF)

[ISSN:1007-449X/CN:23-1 408/TM]

Issue:
2009年03
Page:
371-376
Research Field:
Publishing date:

Info

Title:
Study on rotor broken-bar fault in induction motors based on spectrum analysis of Hilbert modulus
Author(s):
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MA Hong-zhong; YAO Hua-yang; LI Hua-min
Keywords:
induction motors rotor broken-bar fault fault diagnosis Hilbert modulus spectrum analysis
PACS:
TM343
DOI:
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Abstract:
Rotor broken-bar fault is one of the most ordinary faults in induction motors.Based on analyzing the primary diagnosis methods,spectrum analysis of Hilbert modulus(SAHM) is proposed on this paper to study the rotor broken-bar fault.The Hilbert modulus is defined as the sum of the square of a signal and its conjugation.Hilbert modulus is used to covert the fundamental component in original phase current to direct current component,the fault characteristics frequency of bar break is transformed into the twice slip frequency.The problem is solved that fault characteristic component in the spectrum analysis of the current is easily to be blanketed by fundamental component and is hard to highlight fault characteristics.The principle and method of SAHM is presented,and then simulation and experiment for break bar motor and eccentric motor.The results of simulation and experiment indicate that the SAHM method possesses a higher diagnosis precision and a better frequency resolution,which can also overcome the leakage impact of the main frequency of the traditional current spectrum method.Furthermore,this method interms is easily to be engineering achieved.

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Last Update: 2009-07-09