Influences of Permanent Magnets Temperature Characteristic on the Levitation Force of YBaCuO Bulk Superconductors
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Influences of the temperature characteristic of sintered SmCo and NdFeB permanent magnets (PM) on the levitation force of YBaCuO bulk superconductor have been investigated in this paper. It is found that for a NbFeB PM and a SmCo PM which have the same geometric parameters, a larger influence on the levitation force of a temperature decrease of the NdFeB PM has been found. The maximum change of levitation force is as high as 47.6% at a gap of 2 mm between the bottom surface of NdFeB PM and the top surface of YBaCuO bulk when the temperature of the NdFeB PM decreases from room temperature to 77 K. This work provides basic data for high temperature superconducting levitation system measurements.
KeywordsForce relaxation method SmCo NdFeB Temperature characteristic YBaCuO bulk Levitation force
This work is supported by the Fund of Natural Science Foundation of China (Nos. 10472038, 11102077, 11032006, 11121202). This work is also supported by the Specialized Research Fund for the Doctoral Program of Higher Education (No. 20090211120010) and Foundation for the Author of National Excellent Doctoral Dissertation of P.R. of China (No. 201135).