Abstract
High-temperature superconducting (HTS) pinning magnetic levitation (maglev) transit, with the advantages of passive stabilization, nearly resistance free and the ability to suspend in different directions, has attracted more and more attentions. Though the USF (upper-suspension form) and SSF (side-suspension) form of HTS pinning maglev were widely studied and gradually applied in engineering, the weak loading capacity of the LSF (lower-suspension form) has been keeping it from application. In this paper, a new field cooling method is proposed to increase the suspension force of the HTS pinning maglev system in LSF. The vertical and lateral suspension force using the new proposed method was measured and analyzed by two rectangular three-seeded YBa2Cu3O7 bulks, as well as the LSF with the original field cooling method and the USF for comparison. The result shows that, when the bulks move down in 5 mm, the vertical suspension force reaches to 207 N when the FCG (field cooling gap) is 5 mm, 70 N when the FCG is 15 mm. The experimental data suggests that the new proposed field cooling method can increase the vertical suspension force by 32%, and also increase its stability. With this new field cooling method, the loading capacity of the LSF can almost reach the USF, while the guiding capacity is far better than the USF. This paper suggests that the LSF is a potential suspension form for the HTS pinning maglev with the new proposed field cooling method. And this paper can provide insight and reference for different HTS pinning suspension form.
NSTL
Elsevier