Thrust Fluctuation Suppression of Superconducting Linear Synchronous Motor Based on Parallelogram Propulsion Coil
Su Zhenhua1,2, Luo Jun2, Liu Kang2, Cui Libin2, Ma Guangtong1,2
1. School of Electrical Engineering Southwest Jiaotong University Chengdu 610031 China; 2. State Key Laboratory of Rail Transit Vehicle System Southwest Jiaotong University Chengdu 610031 China
Abstract：As one of the most promising magnetic suspension technologies, superconducting electro- dynamic suspension relies on the electromagnetic interaction between the superconducting magnets and track coils to achieve the suspension, guidance, and drive of the vehicle. Therefore, the propulsion coil is a core component of the linear drive actuator for the superconducting electrodynamic suspension train, which is arranged discontinuously along the train's direction of travel. Harmonic components are challenging to avoid in the track traveling wave magnetic field, which further affects the operating stability of superconducting magnets and the safety of the train service. Although the existing double-layer structure of the propulsion coil can effectively suppress the harmonic components and thrust fluctuation of the system, it dramatically increases the manufacturing cost of the coil. This paper proposes a superconducting linear synchronous motor with a single-layer parallelogram structure of propulsion coils. The topological structure can achieve a balance between suppressing thrust fluctuations and reducing costs after an optimized design. Firstly, the electromagnetic model of a superconducting linear synchronous motor is derived. The coil centerline discretization method is employed to accurately characterize the complex geometrical characteristics and spatial layout of propulsion coils and superconducting magnets, ensuring accuracy and efficiency. Secondly, the finite element model and experimental test platform are established. The results show that the relative errors of the proposed model are less than 2% and 3%, respectively, compared with the finite element model and test data. Finally, by coupling the electromagnetic model with a multi-objective optimization algorithm, a set of Pareto fronts is obtained. The thrust fluctuation is effectively suppressed using the non-dominated sorting genetic algorithm-III, while ensuring the output performance of the superconducting linear synchronous motor and the cost of propulsion coils. Based on optimized schemes, the influence of parallelogram structure dimensions on the electromagnetic performance of a superconducting linear synchronous motor is investigated. The following conclusions can be drawn. (1) The thrust transient characteristics obtained by the proposed electromagnetic model are in good agreement with the finite element results and test data, which proves the reliability of the proposed model. (2) Compared with the finite element model, the calculation efficiency of the proposed model is improved by two orders of magnitude. (3) The parallelogram structure of the propulsion coil can effectively suppress the thrust fluctuation of the superconducting linear synchronous motor. In the optimized solution set, the inclination angle of the parallelogram ranges from approximately 10° to 50°, and the inhibition of thrust fluctuation increases significantly with the angle. (4) The single-layer parallelogram structure of the propulsion coils can reduce the amount of coil material and difficulty of installation while ensuring the thrust fluctuation suppression, which provides a scheme for the test line construction of low cost and easy maintenance.
苏振华, 罗俊, 刘康, 崔李滨, 马光同. 基于平行四边形推进线圈的超导直线同步电机推力波动抑制研究[J]. 电工技术学报, 2025, 40(20): 6524-6536.
Su Zhenhua, Luo Jun, Liu Kang, Cui Libin, Ma Guangtong. Thrust Fluctuation Suppression of Superconducting Linear Synchronous Motor Based on Parallelogram Propulsion Coil. Transactions of China Electrotechnical Society, 2025, 40(20): 6524-6536.
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