Abstract
A simple and stable flywheel system with high temperature superconducting levitation is presented that needs no control for levitation. The drive system consists of eight-poles cylindrical permanent magnet and eight cylindrical coils, in which magnetic forces in the direction perpendicular to the shaft axis are cancelled. Hence, vibration force due to the driving is zero in this system. A coil-type electromagnetic damper is also presented which works in the magnetic field of levitation permanent magnet. The dampers lie at both ends of the shaft. Using this system, a control like the sensorless control can be performed by using coils only. The control method has been presented and analytical expressions are also obtained for vibrations of the shaft. To validate the analysis, experimental tests have been carried out.
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