Abstract
High T c melt-processed YBaCuO bulk superconductors have been utilized for the development of high T c superconducting magnetic bearings and flywheels. In such systems the superconductors are exposed to an a.c. magnetic field with frequencies of 100 Hz to 10 kHz during rotation of the rotor where the permanent magnet rings are installed. The a.c. magnetic field is caused by inhomogeneity of the magnetic field generated by the magnet in the azimuthal direction. Here the decay of rotational speed, termed rotational loss, becomes a very serious technical problem. In this paper, we analyse the a.c. magnetic properties of high T c superconductors in the above frequency range using a fundamental experiment and numerical simulation based on the flux flow and creep model and, in addition, we elucidate the mechanism of energy dissipation which causes the rotational loss.
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