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Description
High-temperature superconducting (HTS) Maglev trains are gaining attention as a next-generation transportation technology due to their high efficiency and ultra-high-speed capabilities. However, losses occurring during operation significantly impact system stability and the maintenance of the target magnetic field. In particular, in PCS (Persistent Current Switch)-based HTS Maglev trains, variations in the load factor (the ratio of operating current to critical current) induce nonlinear changes in dynamic resistance and heat losses, presenting substantial challenges for design and operation. To address these issues, this study aims to utilize the homogeneous T-A formulation to calculate current density and magnetic field distribution within the HTS magnet and applies Neumann boundary conditions to precisely analyze energy interactions at the boundaries.
This research will simulate operating scenarios, including initial current charging, acceleration, steady-state operation, and deceleration, to analyze the nonlinear characteristics of current decay and dynamic resistance. The study will specifically evaluate the nonlinear relationship between dynamic resistance and current decay under varying load factors and aims to derive design criteria for PCS to maintain the target magnetic field during operation.
This analysis will clarify the effects of load factor on dynamic resistance and heat losses, providing a systematic understanding of the correlation between thermal stability and magnetic performance. The findings will propose an extensible methodological framework to enhance the design and operational efficiency of not only HTS Maglev trains but also various superconducting systems.
This research was supported by the National R&D Program through the National Research Foundation of Korea (NRF), funded by the Ministry of Science and ICT (2022M3I9A1073187), (No.2019R1A5A8083201).
