Dynamical behavior of flywheel rotor suspended by hysteretic force of HTSCmagnetic bearing

Recently, the application of high-Tc superconductor to a magnetic bearing h as reached the second stage in some institutes and companies. The static st ability of the levitation has already been established. However, the dynami c stability is still under research because the non-linear magnetic charact eristics of HTSC and the, permanent magnet system are not sufficiently unde rstood. In this paper, the dynamic behavior of a flywheel rotor suspended b y HTSC magnetic bearing is discussed experimentally and numerically. The dy namics of the flywheel rotor shows an interesting gyroscopic motion under a hysteretic suspending force between HTSCs and permanent magnets. These typ es of dynamics have never been discussed before. (C) 1999 Academic Press.