188 Ë 6 First manned HTS Maglev vehicle in the world
Fig. 6.45:A scheme for a hybrid Maglev
vehicle system using HTS PMs [48]. (1) HTS
PMs for LSM. (2) Coil for propulsion.
(3) HTS PMs for the suspension. (4) Slide
for landing. (5) Iron guideway. (6) Road pier.
(7) Control coil. (8) Vessel of liquid nitrogen. (9)
Electrical magnet for suspension.Fig. 6.46:The PMs are joined to bulk superconductors [48].
The model of a hybrid Maglev vehicle system using HTS PMs is shown in Fig. 6.45
[48]. The principal parts of this scheme are the same as those for the full-
superconducting scheme with HTSCs in Fig. 6.42. One difference is that additional
electrical magnets are used for suspension. They provide the suspension when HTS
PMs are not suitable. The other difference is the use of the induction plates for
propulsion part of the LIM. Those plates are fixed to the outside of the liquid nitrogen
vessel of and the opposite the propulsion coil. In addition, HTS PMs can be replaced
by PMs or be joined HTS bulks (Fig. 6.46) [48] Stability of HTS PM increases with the
decrease of temperature. Therefore, to achieve high and stable trapped flux, a hybrid
Maglev vehicle system using HTS PMs is suitable for research of the Maglev vehicle,
since the present capabilities of HTS PMs do not achieve a practical level.
The schematic diagram of key components of the EMS Maglev using HTS PM is
shown as in Figs. 6.47 and 6.48 [46]. The scheme requires the HTS PM to have high
performance. It is reasonable to choose a trapped magnetic field of 2 T for the HTS PM,
because the peak field in the iron is greater than 2 T.
There is no gap between the iron and the HTS PM in the whole cooling (Fig. 6.47),
and the magnetic resistance is null. The geometry gap between the rail and the
magnetic pole area of iron core is reduced because of the thickness of the cryogenic
vessel.