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Motivation for research Magnetic bearings have been widely used in high-speed rotation system, machinery, aerospace, and high precision system because of the numerous advantages of non-contact rotating machines, such as a no wearing, low loss, long life span compared with conventional bearings, and absence of lubrication [1][2].
A 300 Wh class flywheel energy storage system using high T c superconductor bearings (HTC SFES) has been under development. The HTC SFES running in a vacuum chamber mainly consists of a composite flywheel rotor, superconductor bearings, a motor/generator and its controller. The present HTC SFES was designed to have maximum operating speed of 33,000 rpm, which is way above two rigid body mode...
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