Analysis of Magnetomotive Force and Performance during Starting Process of Wound-Rotor Brushless Doubly-Fed Machine with Combined Multi-Harmonic Fields
Kan Chaohao1, Bao Xichang1, Jin Ke1, Li Xiao1, Wang Qunjing2
1. College of Electrical & Automatic Engineering Hefei University of Technology Hefei 230009 China; 2. Engineering Research Center for Power Quality of MOE Anhui University Hefei 230601 China
Abstract：Through changing the connection methods of the stator winding of wound-rotor brushless doubly-fed machine(BDFM) with multi-harmonic combined starting, the excitation current generates a fundamental wave magnetomotive force(MMF) and a different pole-pairs harmonic MMF in the same steering. The fundamental wave MMF cooperates with these harmonic MMF to interact with the composite coil windings on the rotor to reduce the starting current and increase the starting torque, thereby the starting performance of the BDFM is improved. In this paper, the mathematical model of MMF of the stator winding of the BDFM is established by detailed derivation; the MMF harmonic content of the BDFM at start-up is analyzed; the magnetic field modulation principles and characteristics of the rotor winding are analyzed. And the equivalent circuit and air gap magnetic density of the motor at start-up were analyzed in detail to research its starting performance. The simulation and experimental results show that the multi-harmonic combined starting method reduces the starting current of BDFM and increases the starting torque, so that the machine has excellent starting performance.
阚超豪, 鲍习昌, 金科, 李霄, 王群京. 绕线转子无刷双馈电机多谐波联合起动过程中磁动势及性能分析[J]. 电工技术学报, 2020, 35(3): 481-493.
Kan Chaohao, Bao Xichang, Jin Ke, Li Xiao, Wang Qunjing. Analysis of Magnetomotive Force and Performance during Starting Process of Wound-Rotor Brushless Doubly-Fed Machine with Combined Multi-Harmonic Fields. Transactions of China Electrotechnical Society, 2020, 35(3): 481-493.
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2020, Vol. 35 
