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

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

“…[16]. Our system is composed of a liquid nitrogen vessel (as vehicle body including multi-seeded YBCO and onboard PMs), Halbach PMG at down side, a three axis load cell to measure the forces in three axes simultaneously, precision mechanical drive and computer control system.…”

“…After this process, the vertical stiffness values were determined by calculating the slope of straight line through each minor loops. Also, we made cycles to obtain minor loops on major loop of guidance force to determine the lateral stiffness value which is very important parameter for the stabilization of the vehicle in Maglev system [13,16]. The lateral stiffness measurements in different CHs (as 5 mm,10 mm and 15 mm) and at the vertical working height of 10 mm were taken similar as the vertical stiffness at the lateral positions of 2, 5 and 8 mm and for the minor loop of Dx = 1 mm.…”

“…In literature, although there are only few studies to change magnetic flux distribution and increase levitation force performance of single-seeded YBCOs with one auxiliary PM in constant position for one FCH, there is no detailed study to investigate the effect of onboard PM position and cooling height on levitation, guidance force and magnetic stiffness of multi-seeded YBCO. As known, generally the auxiliary PM with constant position in onboard unit changes the magnetic circuits and increases both of the load capability and instability of the superconductor Maglev system [15,16]. In our study differently from literature, we investigated levitation, guidance force and magnetic stiffness properties of multi-seeded YBCO bulk depending on different position of onboard PM in different CHs above a Halbach PMG to obtain larger vertical load capability, stability and relating stiffness values simultaneously.…”

HTS-PMG Dizilimlerinin Kritik Akım ve Tuzaklanan Akı Özelliklerinin Nümerik Olarak İncelenmesi

“…This levitation force stems from the induced supercurrents inside the HTS due to the inhomogeneous magnetic field which HTS exposures. This unique property of superconductors is used to develop magnetically levitated transportation (Maglev) systems (Deng et al, 2017;Kusada et al, 2007;Sotelo et al, 2015;Ozturk et al, 2019;Abdioglu et al, 2015), flywheel energy storage systems (Werfel et al, 2012;Basaran and Sivrioglu, 2017), superconducting motors (Hull and Strasic, 2010;Masson and Luongo, 2005;10_Kovalev et al, 2016) and magnetic resonance imaging (MRI) devices (Minervini et al, 2018;Yamamoto et al, 2014), etc. The studies on Maglev systems have increased since the development of first manloaded Maglev vehicle in 2002 by the group of Southwest Jiaotong University in China (Wang et al, 2002).…”

“…Researchers have focused on improving the magnetic levitation and guidance forces of Maglev systems for enhancing the loading capacity and movement stability, respectively. Many studies have been carried out until now to improve the practical applicability potential of Maglev systems via experimental (Deng et al, 2017;Kusada et al, 2007;Abdioglu et al, 2015;Guner et al, 2019), analytical (Ozturk et al, 2019;Ainslie and Fujishiro 2015) and numerical (Ainslie and Fujishiro 2015;Zhang and Coombs, 2012;Ozturk et al, 2012) methods. The electromagnetic behaviour of the above systems should be predicted to figure out the induced current and trapped flux distribution inside the HTS and thus to optimize the design of Maglev systems.…”