Dependence of size and position of ferromagnetic bars on lift force in magnetic levitation system

Basic experiment for examining characteristics of lift force using magnetic shielding effect of a superconducting bulk is performed. The new levitation system provides stable lift force without any active control system. Simple structure of guide way on the ground with only a ferromagnetic bar makes it possible to reduce great amount of cost. The characteristics of lift force for various size of ferromagnetic bar are measured and examined. We have confirmed that there is a limit in the size of ferromagnetic bar to obtain stable lift force. The ferromagnetic bar with a width of 18 mm was the most applicable size in obtaining stability and larger lift force. The results also showed that magnitude of lift force depends on the width of ferromagnetic bar (when the height is within the parameter of 2 to 10 mm), not the volume.