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A 5 kWh class FESS (flywheel energy storage system) with the operating speed range of 9,000~15,000 rpm has been developed. The system consists of a composite flywheel rotor, active magnetic bearings, a motor/generator and its controller. Because active magnetic bearings(AMB) to support the rotor vibration are open-loop unstable, they needs a feedback controller for stable operation. Digital controller...
Stability analysis of the flywheel energy storage system supported by active magnetic bearings is studied in this paper. The system is designed to store 5 kWh at maximum speed of 18,000 rpm and the gyroscopic coupling is strong that the dynamics of system changes with respect to the running speed. To analyze the stability of the system accurately, we derived mathematical models for the system components...
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