Design feasibility of superconducting-hybrid magnetic levitation system for high-speed maglev

We have proposed a new EMS-maglev model with hybrid electromagnets. This paper deals with the design feasibility of electromagnetic suspension (EMS) system for high-speed maglev. As a first step of this work, a design method considering the magnetic interface between the rail and U -shaped iron core was proposed. To design these coils, turns and operating current of high-Tc superconducting (HTS) coil were calculated based on the FEM simulation. We calculated turns and operating current conditions of HTS coil considering the decay of critical current when perpendicular magnetic fields are applied to the HTS coil. In addition to the design of the HTS coil, a Linear Quadratic (LQ) control method was used to design the DC control coils that control the gap distance between the rail and U-shaped iron core. And the control model was introduced and solved to get controller gains. As well as, the control current and the perpendicular magnetic field density applied to the HTS coil due to the operation of DC control coil were analyzed.