The onboard high temperature superconducting (HTS) magnet of electrodynamic suspension (EDS) train suffers from the external magnetic fields generated by the ground coils including the suspension coils, propulsion coils and even generator coils. In such case, the ac losses will be produced in the HTS magnet and lead to a rise in temperature, possibly affecting the operation stability of the...
Coated superconductor magnets have already proved their feasibility in electrodynamic suspension (EDS) application as the on-board magnet, making the liquid-helium-free EDS train become possible. This paper designs a racetrack REBCO magnet served as the on-board magnet of EDS train, including the designs of both the REBCO coil composed of eight double pancake (DP) coils and the tailored...
The world’s first full-sized high-temperature superconducting (HTS) Pinning magnetic levitation (maglev) engineering prototype train was officially launched in SWJTU, Chengdu, China in 2021. This prototype provides strong proof for the feasibility of engineering application of HTS pinning maglev in civil train. This prototype shows the basic load and low speed operation capability of HTS...
Null-flux Electro-dynamic suspension (EDS) system promises to be one of the feasible high-speed maglev systems above 600 km/h. Due to its greater current-carrying capacity, superconducting magnet can provide super-magnetomotive force that is required for null-flux EDS system and cannot be provided by electromagnets and permanent magnets. There is already a relatively mature high-speed maglev...
Abstract: High temperature superconducting (HTS) maglev, which uses the magnetic flux pinning effect to realize the suspension and guidance, has attracted wide attention in the field of transportation due to its advantages of self-stabilizing suspension, high efficiency, and energy saving. As the connection components between the bogie and car body, and the transmission components of traction...
In order to increase the diversity of people's travel mode and fill the blank of the travel speed between the aircraft (900km/h) and the high-speed train (300km/h), the high-temperature superconductor magnetic levitation train still needs to be developed. The conventional magnetic rail used for levitation mainly adopts the isometric magnets. Advanced solution uses Halbach Array, which can...
High-temperature superconducting (HTS) maglev has good application prospects due to its passive stability. There are many researches on the levitation characteristics of a single bulk HTS in applied magnetic field. However, the bulks are usually arranged in an array in practical applications. In addition, experiments proved that levitation force and guidance force of the system with two bulks...
The high-temperature superconducting (HTS) maglev system has tremendous possibilities for future high-speed transportation owing to its salient superiorities of self-stable. However, previous study had indicated that the relatively low damping of HTS maglev system may cause the undesired large-amplitude nonlinear vibration in system. To solve that, electromagnetic shunt damper (EMSD), which...
The superconducting magnets (SCMs) and figure-eight coils (FECs) are core components for the null-flux superconducting electrodynamic suspension (NFSEDS). In this paper, the multi-objective optimization design of NFSEDS is investigated to decrease the size of SCM and FEC based on Non-dominated Sorting Genetic Algorithm-II (NSGA-II). Twelve design variables are selected including the size of...
HTS magnets with magnetomotive force >360 kA and off-power operation time longer than 1 hour have been achieved for a prototype Maglev train. Off-power operation means no power source, no cryocooler, no vacuum pump and no more cryogen supply in the vehicle, like permanent magnets. Such operation mode was realized based on the following techniques: (1) persistent current mode (PCM) operation of...
Elevated bridge is applied widely in maglev railway systems for high-speed ground passenger transportation. But the vibration of vehicle and bridge is essentially coupled with each other and there is a strong problem of vehicle-bridge coupled vibration. Therefore, it is necessary to investigate the vertical dynamic characteristics of superconducting electrodynamic suspension (EDS) train...
