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| Research on Tooth Standing Wave Characteristic of Wound Rotor Brushless Doubly-Fed Machine |
| Ou Lezhi1, Wang Xuefan1,2, Li Zhenming1, Gao Xinmai1, Xiong Fei1 |
1. State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan 430074 China;
2. EAST Group Co. Ltd Dongguan 523808 China |
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Abstract Since there are two sets of winding in the stator of brushless doubly-fed machine (BDFM) and the rotor needs to couple with both two sets of stator winding, the air-gap resultant magnetic field of BDFM is composed of two fundamental harmonic field with different pole pair numbers, which leads to a more complicated magnetic characteristic compared with normal AC machines. Taking wound rotor BDFM as the researching subject, the air-gap magnetic field is analyzed from rotor reference frame by theoretical derivation and finite element (FE) simulation in the paper. A characteristic similar to standing wave, which is called tooth standing wave, is proposed for the air-gap magnetic field. It indicates that the axis of resultant magnetic field is relatively static to rotor in wound rotor BDFM, which is similar with the operating feature of synchronous machine. Meanwhile, the tooth standing wave has great significance in selection of pole pair numbers and optimization of machine performance. At last, a prototype machine has been experimented by embedding detective coils in rotor winding to measure the air-gap flux density, which shows the validity of the theoretical analysis.
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Received: 22 June 2018
Published: 20 September 2019
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2019, Vol. 34 
