Influencing Factors of Levitation Drift Caused by Magnet Vibration

In a levitated high-temperature superconducting system, the drift of levitated body due to vibration of the permanent magnet or an alternating magnetic field is a key and fatal subject in its applications. In this paper, the levitation drift caused by a PM vibration is investigated by a vibration measurement system. The influences of critical current density, levitation gap, weight of the levitated body, voltage across the shaker (amplitude of vibration), cooling height, etc. on the levitation drift have been measured, respectively. In the end, several methods which can reduce the levitation drift are presented and compared; the most reliable method is enhancing the critical current density of the superconductors.