High Temperature Superconducting Stable Levitation Electro-energy Storage Flywheel without Control and Its Nonlinear Dynamic Analysis

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In this paper, a simple and stable energy-storage flywheel system with high temperature superconducting levitation is presented. This system has new methods in drive system and electromagnetic damper. In order to have stable levitation, a superconductor and a permanent magnet are used, and 3 permanent magnets support the top of the shaft. In the part of drive system, 8-poles permanent magnet and 8 coils are used to cancel electromagnetic force in the radial direction. A magnetic damper consisting of permanent magnet for levitation and 4 coils is presented, which lies at each end of the shaft. When the shaft vibrates in the direction perpendicular to the shaft, the current flows in the damper coil. It generates the electromagnetic force. The force is in proportion with vibration frequency of the shaft, so that the force behaves like damping forces. Using this system, we have stable levitation, and vibrations at resonance frequencies can be suppressed significantly.