Rotor broken-bar fault diagnosis of induction motor based on HHT of the startup electromagnetic torque

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  • 1.College of Electronic Engineering, Zhejiang University, Hangzhou 310027, China; 2.;

Published date: 05 Jun 2006

Abstract

This paper presents a new method for rotor broken-bar fault diagnosis of induction motors. The asymmetry of the rotor caused by broken-bar fault will give rise to the appearance of additional frequency component of 2 sfs (s is slip and fs is supply frequency) in the electromagnetic torque spectrum. The startup electromagnetic torque signal is decomposed into several intrinsic mode function (IMF) with empirical mode decomposition (EMD) based on the Hilbert-Huang Transform. Then, using the instantaneous frequency extraction principle of the Hilbert Transform, the rotor broken-bar fault characteristic frequency of 2sfs can be exactly extracted from the IMF component, which includes the rotor fault information. Moreover, the magnitude of the IMF which includes the rotor fault information can also give the number of rotor broken bars. Experimental results demonstrate that the proposed electromagnetic torque-based fault diagnosis method is feasible.

Cite this article

NIU Fa-liang, HUANG Jin, YANG Jia-qiang, CHEN Li-yuan, JIN Hai . Rotor broken-bar fault diagnosis of induction motor based on HHT of the startup electromagnetic torque[J]. Frontiers of Electrical and Electronic Engineering, 2006 , 1(2) : 188 -193 . DOI: 10.1007/s11460-006-0022-3

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