200 Ë 6 First manned HTS Maglev vehicle in the world
Fig. 6.63:Levitation forces of a single
on-board HTS Maglev equipment over a
single-NdFeB PMG on August 29, 2000 [1].Tab. 6.14:Total levitation forces of eight on-board HTS Maglev equipments over the PMG.
10 15 20 25 30
2000/12/24 10 , 884. 5 9221. 7 7562. 6 6185. 3 5061. 2
2001/07/21 10 , 943 8940. 4 7270. 6 5889. 7 4790. 7
To obtain both larger levitation force and guidance force, HTS YBCO bulks had to be
cooled in an appropriate applied magnetic field. First, the vehicle body was lifted with
a liquid pressure elevation equipment until the bottom of the on-board HTS Maglev
equipment was 42 mm away from the surface of the PMG, then YBCO bulks were cooled
with liquid nitrogen. After the YBCO bulks were in the superconducting state, the
vehicle body was released from the elevation equipment. The HTS Maglev provide
inherent stable forces both in levitation and for guidance. The net gap between the
bottom of the on-board HTS Maglev equipment and the PMG face was 35 mm. After
the cryogenic vessel was filled with liquid nitrogen, the vehicle could continuously
run for about 6 hours.
Figure 6.63 shows the measurement result of the single on-board HTS Maglev
equipment above a single-NdFeB PMG from August 29, 2000 [1]. The levitation forces
on the single rectangular-shaped liquid nitrogen vessel were 1055 and 1362 N at
levitation gaps (between the PMG face and HTS bulks) of 15 and 8 mm, respectively. In
addition, the levitation force increased to 1823 N at a levitation gap of 7 mm in another
experiment over the NdFeB PMG.
Figure 6.64 and Tab. 6.14 show the total levitation forces of the eight on-board HTS
Maglev equipments over the PMG. The total levitation forces of the eight on-board HTS
Maglev equipments over the NdFeB PMG were 9000 and 11,000 N at levitation gaps
of 15 and 10 mm, respectively. The total levitation forces of the eight on-board HTS
Maglev equipments over the NdFeB PMG were 8000 and 10,500 N at net levitation
gaps (deduct the 3 mm bottom thickness of liquid nitrogen vessel) of 15 and 8 mm,
respectively.