Research on electromagnetic characteristics of ironless PMSLM for HTSP high-speed maglev based on simulation-experiment closed-loop

Abstract The integration of linear motor and maglev technology enables contactless vehicle operation, laying the foundation for the speedup of rail transit. The high-temperature superconducting pinning (HTSP) maglev system is a passive levitation system, and its high-speed operation imposes explicit performance requirements on the traction system: a relatively large thrust to ensure high-speed traction capacity, a low normal force to avoid additional loads on the passive levitation system, and low thrust ripple to guarantee stable system operation. The ironless permanent magnet synchronous linear motor (PMSLM) meets all these demands, making it an ideal traction solution for HTSP high-speed maglev engineering. Focusing on the engineering application of HTSP maglev transportation, this paper takes the world’s first HTSP high-speed maglev engineering prototype’s ironless PMSLM as the research object, and investigates its electromagnetic characteristics based on actual prototype parameters. A finite element method model (FEM) is established to calculate the air-gap magnetic field and electromagnetic force, and a prototype test platform is built for experimental verification. Simulation and experimental results are in good agreement, verifying that the finite element model is reliable and accurate, and that the motor performance satisfies the system design requirements. Based on the validated model, the variation laws of electromagnetic parameters and the effects of key factors on electromagnetic force are clarified. The research results provide support for the collaborative design of traction-levitation-track systems and further promote the engineering application of HTSP maglev technology.