In order to improve the cost performance of the present
high-Tc
superconducting (HTS) Maglev vehicle system for practical application, the multi-pole
permanent magnet guideway (PMG) concept was introduced. A well-known double-pole
Halbach PMG was chosen as a representative of multi-pole PMGs to compare with
traditional monopole PMGs from the point of view of levitation efficiency and cost.
Experimental results show that YBCO bulks above the double-pole Halbach PMG can
exhibit better load capability and guidance performance as well as dynamics stability at
the applied working height between the bulk HTSC and the PMG due to a more reasonable
magnetic field distribution at the working range of bulk HTSC. Furthermore, the
double-pole PMG configuration can play a more important role in improving guidance
performance due to the potential-well field configuration. By comparing with former
‘century’ PMGs, the double-pole Halbach PMG shows another remarkable advantage in
reducing the cost of levitation. As another necessary issue, magnetic field homogeneity
and the corresponding magnetic drag force of a double-pole Halbach PMG has
been considered by experiment in spite of the above highlights. Synthetically,
the multi-pole Halbach PMG design is concluded to be one important choice for
future HTS Maglev vehicle applications because of its high efficiency and low cost.
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