Hybrid Levitation While Incorporating YBCO Bulks With DC Coil

In order to improve the levitation performance of high temperature superconducting (HTS) maglev, a DC coil was winded around double-layered YBCO bulks to enable the controllability of the levitation system. The hybrid levitation forces and guidance forces were studied. It was found that by increasing the repelling force between the DC coil and permanent magnetic guideway (PMG), the levitation force had been remarkably improve; however, the stability of the system was gradually crumbled. Therefore, DC coil could be used to improve the levitation force within the permission of stability. On the other hand, within the permission of the levitation force declination, increase the attraction force between DC coil and PMG could enhance the guidance force. The performance of the YBCO bulks was also affected by the existence of the DC coil, which will be discussed from Bean's critical state model.