Research on Inverter Feedback Control System for Permanent Magnet Linear Motor with Secondary Segmented Flux Switching forUrban Rail Transit Applications
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    Abstract:

    [Objective] The secondary segmented flux-switching permanent magnet linear motor (Sseg-FSPMLM), which combines high efficiency with low cost, is well-suited for traction systems in urban rail transit. This paper investigates the applicability of the Sseg-FSPMLM under the condition of compatibility with existing traction and inverter feedback topologies, with the aim of evaluating its potential for practical engineering applications. [Methods] Firstly, using Guangzhou Metro Line 4 as a case study, a comparative analysis of the linear induction motor (LIM) and the Sseg-FSPMLM was conducted, focusing on motor efficiency and operational costs. Subsequently, without modifying the existing traction power supply system or inverter regeneration topology, an integrated simulation model was developed. This model incorporated the urban rail traction load, the regenerative energy storage device, and the grid interface. Finally, based on key parameter designs, the performance of the Sseg-FSPMLM-based inverter regeneration system was tested and evaluated. [Results] Under equivalent thrust requirements, the Sseg-FSPMLM achieved a 20% improvement in efficiency compared to the LIM, along with a 34% reduction in material costs. Simulations performed using the developed inverter regeneration model demonstrated a total recovered energy of 9.23×105 J, accounted for 43.74% of the kinetic energy present before braking. [Conclusion] When the Sseg-FSPMLM is deployed as a traction motor in existing systems, no structural modification to the inverter regeneration topology is required. By solely re-optimizing the electrical parameters, the dynamic performance and stability of the regenerative braking energy feedback system can be effectively ensured. This verifies the feasibility of directly integrating the Sseg-FSPMLM into current rail transit infrastructure.

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MA Bin, XU Qiongjing, ZHANG Ruowei, DUAN Lingli, ZHANG Yao, ZHANG Tinghui, WANG Yuting, ZHU Ying. Research on Inverter Feedback Control System for Permanent Magnet Linear Motor with Secondary Segmented Flux Switching forUrban Rail Transit Applications[J]. Electric Machines & Control Application,2025,52(12):1262-1271.

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History
  • Received:July 10,2025
  • Revised:October 01,2025
  • Adopted:
  • Online: December 29,2025
  • Published:
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