Improved Maglev Performance of Bulk High-Temperature Superconductors with a Re-magnetization Process After Zero-Field Cooling

Levitation and guidance force efficiencies of bulk YBCO for different permanent magnetic guideways

“…The vertical levitation force measurements were done in different CHs to determine the optimum cooling height and flux trapping performance of the PMGs on the YBCOs. The maximum value of levitation forces increases while the CH increases for all PMGs as expected [21]. One can see from the figure that PMG3-3 gives the best levitation force in all CHs and also the best attractive force in CH = 5 mm and CH = 20 mm.…”

“…The increment of guidance force with decreasing CH is attributed to the fact that the flux trapping is more effective in small CHs. This situation was reported in most of experimental study related to the levitation and guidance forces depending on CH and also in lots of numerical study that using the critical state model [21,23]. It is seen in Fig.…”

Effect of onboard PM position on the magnetic force and stiffness performance of multi-seeded YBCO

“…Therefore, to improve magnetic force and produce more stable levitation in different geometries, various properties of HTS are important subjects that has been under the spotlight for many years [4][5][6][7][8]. Maglev systems and its applications generally used single-seeded crystal samples as HTS [6,9].…”

“…For that, larger bulk sizes are required to increase the levitation force efficiency of superconductor bulks above a PMG, by reducing the number of HTS bulk connections and so nonsuperconductor gaps. Therefore, in literature multi-seeded bulk YBCO samples were selected to enhance levitation force properties of Maglev system [2][3][4][5]7].…”

“…Reported studies in literature are mostly related to Halbach PMG array [4,5,7,8,10] and focus on improving PMG arrays below HTS unit. In a study it is concluded that the Halbach PMG has a notable effect in concentrating the magnetic field into its upper surface so as to increase the efficiency of the PMG [14].…”