Objective The PLG (propulsion, levitation, and guidance) system of the superconducting electrodynamic maglev train features non-contact operation, low energy consumption, high speed and high reliability. It has become an important structural form of new generation high-speed maglev transportation system, holding great theoretical research significance and promising engineering application prospects. Therefore, it is necessary to conduct systematic and in-depth research on this system.

Method The technical principles of the superconducting electrodynamic maglev train are introduced, and the circuit model of the PLG magnetic levitation system composed of superconducting and track coils are analyzed. Based on circuit and electromagnetic field theories, the energy method is adopted to calculate the PLG forces, including traction force, suspension force, and guidance force during train operation. In accordance with Neumann's formula, the numerical expression of mutual inductance between superconducting coils and track coils varying with train positions is derived, and a magnetic field-circuit-motion coupling model for the PLG maglev system is further established. With the coupling model, the inductive coupling factor between superconducting coils and track coils of the PLG system is investigated, along with the variation characteristics of multi-directional mutual inductance against the lateral displacement offset and vertical displacement of the train. The dynamic variation rules of PLG traction force, suspension force, and guidance force during train operation are also analyzed.

Result & Conclusion  The research results show that the PLG superconducting electrodynamic maglev system retains the characteristics of conventional superconducting electrodynamic maglev systems, and exhibits superior performance in terms of PLG.