A Stationary Simulation Method for Dynamic Electromechanical Characteristic in Null-Flux Electrodynamic Suspension Systems

Accurate simulation models are essential for the design and analysis of null-flux electrodynamic suspension (EDS) systems. A novel stationary simulation method for evaluating electromagnetic forces in dynamic EDS systems, specifically applied to maglev trains, is proposed. Unlike traditional approaches that use moving test platforms, the method allows for the simulation of magnetic forces and torques of EDS components in real time without requiring high-speed motion of the test apparatus. The core innovation of the approach lies in replacing the conventional null-flux coils (NFCs) with a series of fixed test bench coils (TBCs), which are powered by dynamically controlled currents after an elaborately designed magnetic field equivalence calculation. These TBCs replicate the electromagnetic characteristics of the EDS system, enabling the real-time simulation of magnetic forces and torques during stationary operation. A small-scale test device was developed to validate the proposed method. The primary advantage of this method is that it eliminates the need for precise magnetic field measurements while providing an efficient way to simulate the operation of EDS trains or bogies. It was found that the measured magnetic forces and torques demonstrate good agreement with theoretical calculations, confirming the validity of the proposed method. A feasible and cost-effective approach for conducting full-scale dynamic EDS vehicle experiments in controlled indoor environments is provided.