The Single-peak and "V" Shaped Combined Permanent Magnet Guideway for High-Temperature Superconducting Magnetic Levitation

With the merits of the excellent self-stabilization, the high-temperature superconducting (HTS) magnetic levitation (maglev) system is relatively appropriate for high-speed railway transportation. The suspension force and guidance force are mainly produced by the interaction between the HTS bulks and the permanent magnet guideway (PMG). Before the HTS bulks turn into the superconducting state, it will capture the magnetic field generated by the PMG and interact with the magnetic field of PMG after turning into the superconducting state, which creates the suspension phenomena. Therefore, the research of the magnetic flux density of external magnetic fields excited by the PMG is very significant to an intensive discovery of HTS maglev properties. However, the previous single-peak guideway needs to be improved to supply HTS maglev with sufficient vertical magnetic fields gradients. Otherwise, it might cause the guidance force to be not great enough for practical engineering application. Hence, this paper proposed a better "V" shaped PMG, by combining the single-peak and "V" shaped PMG. Under the typical work condition of 30 mm field cooling height, 10 mm work height and 10 mm lateral displacement, the levitation force and guidance force of HTS bulks could attain 6779 N and 2778 N, respectively. Compared to the levitation force and guidance force produced by using single-peak PMG, these two forces increase by 12.6% and 137%. As a result, the new "V" shaped PMG will provide HTS maglev with more adequate guidance performance and load capacity.