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ZJUS-A
Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering)  2007, Vol. 8 Issue (8): 1320-1329    DOI: 10.1631/jzus.2007.A1320
Information Science     
Rotor broken bar fault diagnosis for induction motors based on double PQ transformation
HUANG Jin, YANG Jia-qiang, NIU Fa-liang
School of Electrical Engineering, Zhejiang University, Hangzhou 310027, China
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Abstract  A new rotor broken bar fault diagnosis method for induction motors based on the double PQ transformation is presented. By distinguishing the different patterns of the PQ components in the PQ plane, the rotor broken bar fault can be detected. The magnitude of power component directly resulted from rotor fault is used as the fault indicator and the distance between the point of no-load condition and the center of the ellipse as its normalization value. Based on these, the fault severity factor which is completely independent of the inertia and load level is defined. Moreover, a method to reliably discriminate between rotor faults and periodic load fluctuation is presented. Experimental results from a 4 kW induction motor demonstrated the validity of the proposed method.

Key words： PQ transformation      Fault diagnosis      Load fluctuation      Fault severity factor      Induction motors     
Received: 10 January 2007     
CLC:  TM343  
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HUANG Jin
YANG Jia-qiang
NIU Fa-liang
Cite this article:

HUANG Jin, YANG Jia-qiang, NIU Fa-liang. Rotor broken bar fault diagnosis for induction motors based on double PQ transformation. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 2007, 8(8): 1320-1329.

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http://www.zjujournals.com/xueshu/zjus-a/10.1631/jzus.2007.A1320     OR     http://www.zjujournals.com/xueshu/zjus-a/Y2007/V8/I8/1320

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