212 Ë 6 First manned HTS Maglev vehicle in the world
Fig. 6.77:Measurement results
of levitation forces.Fig. 6.78:Measurement results
of levitation force relaxation.ability, namely the pinning properties, did not decrease because of long-term loading
operations.
The levitation force (Fig. 6.77), hysteresis, and relaxation (Fig. 6.78) of YBCO bulks,
which were cooled at the liquid nitrogen temperature 77 K, were measured with the
SCML-02 HTS Maglev measurement system in June 2009 [63]. (A5) is And on-board
bulk YBCO from 2000, (old-1) is bulk YBCO from 2000 but not loaded, (07-1) was new
in 2007; (08-1) was new in 2008 [63]. This was to analyze the variation of levitation
performance of different bulk YBCO samples during different periods after fabrication
of the YBCO.
Figure 6.77 is the comparison of the levitation forces of different bulk YBCOs
fabricated during 2000–2008, and Fig. 6.78 is the comparison of the levitation force
relaxation of these YBCO bulks. The square YBCO bulk 08-1 was produced in 2008.
These experimental results validated that the performances of the bulk YBCO
samples above the PMG did not change after nearly 9 years. Our research results
can be applied not only to the manned HTS Maglev vehicle, but also to other super-
conducting applications such as HTS Maglev bearings and superconducting fly-
wheel energy storage devices.