Effect of Rotor Eccentricity Fault on Air Gap Magnetic Field in Brushless Doubly-Fed Machine
Ge Baojun, Mao Bo, Lin Peng, Xiao Fang, Niu Huanran
National Engineering Research Center of Large Electric Machines and Heat Transfer Technology Harbin University of Science and Technology Harbin 150080 China
Abstract In order to accurately analyze the distribution characteristics and variation law of the air gap magnetic field of the brushless doubly-fed electric machine after the rotor eccentric fault, the magnetic field generated by two sets of windings of different pole numbers on the stator side was analyzed by the magnetic potential and magnetic permeability method. The influence of the air gap magnetic field was established. Then the field-circuit coupling model of brushless doubly-fed electric machine with rotor eccentricity considered was established, and the air gap magnetic field under the eccentric fault of the brushless doubly-fed electric machine was calculated. It was analyzed that the static and dynamic eccentricity of the rotor will cause the air gap magnetic field distortion and introduce new spatial harmonic components. The rotor dynamic eccentricity fault will also introduce new time harmonics. The variation law of time harmonics with eccentricity and the distribution of time harmonics along the selected air gap circle under the same eccentricity were studied. The analytic method results are consistent with the simulation results of the field-circuit coupling model and compared with the results from test coils. This paper provides a theoretical basis for the detection and diagnosis of rotor eccentricity faults.
Ge Baojun,Mao Bo,Lin Peng等. Effect of Rotor Eccentricity Fault on Air Gap Magnetic Field in Brushless Doubly-Fed Machine[J]. Transactions of China Electrotechnical Society, 2020, 35(3): 502-508.
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2020, Vol. 35 
