Levitation Force of Magnetized HTS Tape Stacks

Abstract

High-temperature superconductors (HTS) have the significant potential of magnetic-force-based applications. Nowadays, wide spread of coated conductors tapes (CC-tapes) enables the use of HTS stacks in levitation applications. For the development of CC-tapes-based bearings and transportation systems, it is important to have information on stability of the system in response to the lateral displacements. This study continues series of studies on the levitation properties of CC-tapes stacks and primarily focuses on the magnetized stacks. In our study, we present new results on investigation of the magnetic levitation force between the permanent magnet and magnetized stack of HTS tapes containing from 100 and 200 tapes of 12 mm × 12 mm. Stacks were magnetized in 8-T superconducting magnet and placed in a levitation force measurement system. Levitation force and trapped flux were studied for various magnetizations of the stack and for various numbers of layers in the stack. In addition, stability of the system was studied. The experimental investigations on the influence of lateral displacement on the levitation performance of stack with different trapped fluxes and stack thicknesses were processed in this study. Levitation force decay during the lateral displacements above a permanent magnet was observed.