Abstract
A variety of applications with high-temperature superconducting (HTS) magnet require the same characteristic which is the stable magnetic field generated by the persistent current flowing in the magnet. Regretfully, in the linear motor system of magnetic levitation transportation, HTS magnet will suffer from a current decay both internally and externally. On the one hand, joints loss represents the main cause internally. On the other hand, ac losses resulted from external ac circumstance can lead to the worse situation. To alleviate negative factors resulting in current decay, it is necessary to study the effects they will make. In this paper, in order to clarify the current-decay problem, a flux pump system based on transformer-rectifier principle was established for charging the no-insulation racetrack-coated superconductor coil, whose saturated current can be over 70% of the critical current. The variation of current, self-field, and electromagnetic forces of HTS magnet subjected to the traveling magnetic fields generated by a copper-based three-phase stator were observed experimentally. Our conclusion shows that, when the HTS magnet is placed above the three-phase stator, the characteristics of current decay have a strong dependence upon the amplitude and frequency of stator current.
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