Equivalent Circuit for Nested-Loop Secondary Linear Doubly-Fed Machine Considering End Effect
Ge Jian1, Xu Wei1, Liu Yi1, Zhang Yaping1, Bao Zhen1, Li Dayi1, Li Weiye2, Lin Guobin3
1. State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan 430074 China; 2. Xiangyang CRRC Motor Technology Co. Ltd Xiangyang 441047 China; 3. Maglev Transportation Engineering R&D Center Tongji University Shanghai 201804 China
Abstract Research on the nested-loop secondary linear doubly-fed machine (NLS-LDFM) is quite scarce. The feature of its end effect is not clear along with no appropriate equivalent circuit, which restricts the further development of this kind of machine. In view of the problem, the static and dynamic end effects of NLS-LDFM are studied separately in this paper. And the equivalent circuit considering the end effect is built. Firstly, the mechanism of direct coupling by static end effect is clarified based on the winding theory for short primary linear machine. The characteristics of induced electromotive force generated by direct coupling are analyzed and the equivalent impedance is deduced. Secondly, the transition process of nested loop during steady-state operation of NLS-LDFM is analyzed. And the dynamic end effect correction coefficient is calculated. Thirdly, the equivalent circuit of NLS-LDFM is built based on the analysis of end effect and the traditional equivalent circuit of brushless doubly-fed machine. And the expression of thrust is derived. Finally, the rationality of the analysis results is indirectly verified by the finite element simulation and experiment for static and dynamic end effect respectively.
Ge Jian,Xu Wei,Liu Yi等. Equivalent Circuit for Nested-Loop Secondary Linear Doubly-Fed Machine Considering End Effect[J]. Transactions of China Electrotechnical Society, 2022, 37(19): 4957-4968.
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