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Description
The so-called fully superconducting magnetic bearing (SMB) is composed of a rotor of high temperature superconducting (HTS) bulk of YBaCuO and a stator wind wounded by HTS coated conductor tapes. The fully SMB has been developed a prototype and is in operation in Japan. The dynamics of fully SMB under long term operation is crucial to engineering applications, however, the experimental and theoretical studies on dynamic behaviors of fully SMB were less reported in recent years. In our previous work, the levitation properties of HTS bulk exposed to the high magnetic field, which is larger than 2 T and generated by HTS coils wounded by HTS coated conductor tapes, were numerically investigated and discussed with the fish-tail effect in levitation force prediction. In this work, a 2-dimensional(2-D) model of the fully SMB is introduced and coupled with the 2-D motion 2nd-order equations with respect to time, to simulate the dynamic behaviors in the vertical directions. The dynamic responses of a fully HTS SMB under pulsed excitation will be investigated, such as the displacements in time and frequency domains, phase trajectories, and motion trajectories. It turns out that the 2-D model with ease of implementation can provide a beneficial tool for analyzing the dynamics of linear SMB, and the numerical results, inaccessible through simplified analytical models, offer better quantitative dynamic characteristics and principles for applications of linear SMB. This work will provide an initial promotion of quantitative discussion in dynamic characteristics and principles for applications of fully SMB.
