A Piecewise Equivalent Circuit and Characteristic Analysis of Linear Induction Traction Motor when the Secondary is Discontinuous
LÜ Gang1, Luo Zhikun1, Zeng Dihui2, Zhou Tong1
1. School of Electrical Engineering Beijing Jiaotong University Beijing 100044 China; 2. Institute of Electrical Engineering Chinese Academy of Sciences Beijing 100190 China
Abstract：A piecewise equivalent circuit model is proposed, and the electromagnetic phenomena and characteristics of linear induction traction motor with discontinuous secondary are analyzed. Firstly, the physical model of linear induction motor with discontinuous secondary is established. According to the coupling situation of primary and secondary, the process of primary passing through discontinuous region is divided into nine stages. Secondly, a piecewise equivalent circuit model is proposed, and the variation of equivalent circuit parameters are analyzed when the secondary discontinuity occurs. Then, the effects of the finite length of primary core, transverse and longitudinal end effects, skin effect and half-filled slots of primary are considered. According to the electromagnetic field analysis model and the integral interval of each stage, the thrust, reactive power transferred by air gap, eddy current loss of secondary plate, mechanical efficiency and equivalent circuit parameters are calculated. Finally, thrust under different frequencies and speeds, the dynamic curves of thrust and efficiency, are compared with the experimental results, and the characteristics of the motor are analyzed, which verify the correctness of the equivalent circuit.
吕刚, 罗志昆, 曾迪晖, 周桐. 次级断续时直线感应牵引电机的分段式等效电路与特性分析[J]. 电工技术学报, 2021, 36(5): 944-953.
LÜ Gang, Luo Zhikun, Zeng Dihui, Zhou Tong. A Piecewise Equivalent Circuit and Characteristic Analysis of Linear Induction Traction Motor when the Secondary is Discontinuous. Transactions of China Electrotechnical Society, 2021, 36(5): 944-953.
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2021, Vol. 36 
