The Study Of Magnetic Levitation Performance Of High Temperature Superconductor In Deep Cool Condition

The finding of high temperature superconductor (HTS) made a lot of scientists research and study it, then critical temperature of HTS was on the increase. The improvement of performance of HTS makes its application in magnetic levitation and other areas become easier.In this paper, the levitation performance of Melt-Textured Growth (MTG) YBaCuO bulk effected on NdFeB in the condition of deep cool. The research includes temperature controlling in deep cool condition, data sampling, relationship between levitation force and levitation gap in different temperature, and relationship between levitation force and temperature in a certain levitationgap-The deep cool condition is provided by G-M refrigerator, and a bent adapter connector fixed on second step cooling head is designed to fix YBaCuO bulk. A deep cool measurement system software is developed using LabWindows/CVI, which is used to control and trace temperature, sample data of levitation force and temperature in a certain levitation gap, and process and analyze the sampled data at the same time. The YBaCuO bulk is cooled down to different temperature and the levitation force is measured and analyzed using the HTS Maglev measurement system, the G-M refrigerator and the deep cool measurement system.Results show that the levitation force is generated between the high temperature superconductor and the magnetic field under the critical temperature. The value of the levitation force is determined by the temperature and the gradient of magnetic field. That is the smaller of the gap, the larger of the levitation force when the temperature is fixed, and the value of the levitation force is an exponential function of the gap. When the gap is fixed, the lower the temperature, the larger the levitation force and increases quicker between 90K and 80K.