A Model Superconducting Magnets for a Magnetically Suspended High-Speed Train

Abstract

This paper describes characteristics and behaviours of a model superconducting magnet used for a magnetically suspended highspeed train.If the characteristics length of the order of 1m is chosen for a model superconducting magnet as compared with the real vehicle dimension, the dimension 7-10cm would be possible as a dimension between the center of the winding and the surface of the cryostat bottom which faced to the ground coil array; containing the radiation shielding layer as the inner structure of the cryostat. The coil dimension of 1.2m long and 0.3m wide measured to the winding were chosen as a result of the coil configuration studies of the levitation characteritics. The maximum field were 27KG at the designed operating current of 500A.The electromagnetic force on the superconducing coil has three components; the lift force, the transverse and the driving forces. The lift force acting on the entire part of the windings was held with the coil former. And the force on the former was held and transmitted cocen-trically with the four columns to the part of room temperature.For the horizontal components of the force; the transverse force or driving force, the coil was fixed with the thin rods of stainless steel, to the side wall of the outer vessel.The electromagnetic forces acting of the superconducting magnet were determined using a “static levitation experiment” facility in which the superconducting magnet was set above the model ground coils involving a stabilizer coil.In the static test, the rigidity of the cryostats against the lift and transverse force acting on the superconducting coils inside the cryostats was also tested.Finally, the dynamic tests using a disc of 3.1m in diameter as a coil track or a sheet track were performed.The evaporation rate of liquid helium was 5-10l/h throughout those experiments.