Numerical Analysis of Levitation Forces Dynamic Behavior in the HTS-Magnet Levitation System
t is important to simulate the levitation force and its relaxation with time for the designers in the process of designing a HTS (high temperature superconductor)-magnet levitation bearing. In this paper, FEM (finite element method) based on HTSs critical-state model using H formulation was introduced. In the zero field condition, the process of magnetization of a cylindrical HTS bulk was simulated. The result showed that, current would be induced when HTS bulk was put in the external magnetic field, and the induced current tried to prevent the change of the magnetic field in the HTS bulk. When the external field disappeared, HTS bulk trapped some of the field and the bulk was magnetized. HTS-magnet levitation models were built in both the axisymmetric field and the plane field. Forces and their relaxations with time were calculated. In the HTS-magnet levitation system, force faded with time and faded slower as time went on. The force was bigger when the HTS bulk was put closer to the magnet and relaxed a little more.
Lianjun Wang, Xiumei Wang, Guo Yan and Kefu Yao
W. F. Zhang et al., "Numerical Analysis of Levitation Forces Dynamic Behavior in the HTS-Magnet Levitation System", Materials Science Forum, Vols. 745-746, pp. 233-238, 2013