【目的】次级分段式磁通切换永磁直线电机(FSPMLM)因其结构简单、效率高、功率密度大及制造成本低等特点，近年来在城市轨道交通牵引系统中展现出广阔的应用前景。为验证该类电机在真实供电环境下牵引控制策略的有效性，本文开展了系统性建模与性能评估研究。【方法】首先，结合城市轨道交通直流牵引系统的典型运行特性，构建了考虑动态电压波动的供电模型，以真实反映电机运行环境；其次，基于有限元分析结果，建立了次级分段式FSPMLM的d-q轴数学模型，并设计了磁场定向控制策略，以实现速度精确控制。最终，通过Matlab/Simulink仿真平台进行系统建模与验证，并基于小功率样机搭建试验平台，对关键性能指标进行实测比对。【结果】仿真与试验结果表明，该电机系统在给定速度突变情况下控制精度高、响应速度快、推力波动小及稳定性强，具有良好的动态性能与稳态运行特性。【结论】研究表明，在地铁实际供电电压等级条件下，次级分段式FSPMLM搭配矢量控制策略能够实现高效、稳定的速度控制，具备良好的工程实用性与推广前景，为城市轨道交通电气化牵引系统提供了高性价比的技术方案。

[Objective] In recent years, secondary segmented flux-switching permanent magnet linear motor (FSPMLM) has demonstrated significant application potential in urban rail transit traction systems, owing to their simple structure, high efficiency, high power density, and low manufacturing cost. To verify the effectiveness of the traction control strategy for this type of motor under real-world power supply conditions, this paper conducts a comprehensive study involving system modeling, simulation, and experimental performance evaluation. [Methods] Firstly, a power supply model that incorporated dynamic voltage fluctuations was developed to accurately simulate the operating environment of urban rail DC traction systems. This model reflectd the typical voltage variations encountered during actual operation. Next, based on the results of finite element analysis, the d-q axis mathematical model of the FSPMLM was established. A magnetic field-oriented control strategy was then designed to achieve precise closed-loop speed control. Finally, the entire system was modeled and validated using Matlab/Simulink simulation tools. Additionally, a low-power experimental platform was constructed, based on a physical prototype, to obtain real measurement data and validate the simulation outcomes by comparing key performance indicators. [Results] Both the simulation and experimental results showed consistent findings: the motor system achieved high control accuracy and rapid dynamic response under conditions of sudden speed variation. It also maintained low thrust fluctuation, strong system stability, and excellent dynamic and steady-state performance. These results confirmed the reliability and responsiveness of the proposed control strategy. [Conclusion] This study confirms that the secondary segmented FSPMLM, when equipped with a vector control strategy, can achieve efficient and stable speed regulation under the voltage conditions typical of urban subway power supply systems. The approach offers a cost-effective, technically sound solution with strong engineering practicality and wide application potential in modern electrified traction systems for urban rail transit.

国网江苏省电力有限公司省管产业科技项目(JC2024108)