Study on Eccentricity Fault of Brushless Doubly-fed Generator With Wound Rotor Based on Motor Current Signature Analysis
Brushless doubly-fed machine(BDFM)with wound rotor has great prospects in the field of generation system as ship shaft and wind power generator.Eccentricity fault is a common mechanical fault,which threatens the stable operation of modern industrial system,so it is of great importance to achieve condition monitoring and fault diagnosis.Traditional fault diagnosis methods are not directly applicable to BDFM due to the special design of winding and complex magnetic field pattern.This paper extracts the current harmonics of power winding as fault indicators by the motor current signal analysis(MCSA)to realize the non-invasive diagnosis of static-,dynamic-and mixed eccentricity.A time-stepped finite element model of the faulty machine is established.The characteristic frequencies that could result from different types of the faults are deduced through detailed mechanism analysis.Finally,a 2/4 number of pole pairs BDFM is used as an example and the accuracy and validity of analytical method is verified by finite element simulation and experiment,which provides a theoretical basis for accurate detection of eccentricity faults in brushless doubly-fed machine with wound rotor.
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