6.13 Maglev vehicle using HTS PMs Ë 189Fig. 6.47:Scheme A for the EMS Maglev vehicle
using the HTS PM [46].Fig. 6.48:Scheme B for the EMS Maglev vehicle
using the HTS PM [46].In Fig. 6.48, the net gap (the suspension height) between the rail and the magnetic
pole area of iron core is higher, because there is no cryogenic vessel near the magnetic
pole area. In contrast, there is a gap between the iron and the HTS PM, and the
magnetic resistance is not null. It is difficult to make a thin-wall cryogenic vessel. In
any case, this scheme can be realized, and its many problems should be thoroughly
and carefully studied.
This scheme has the possibility to be achievable because the trapped field of the
HTS bulk materials has achieved the value of 2 T [52]. In practical application, it is also
very important to excite the field of the HTS PMs. Both the method and process of the
exciting the field should be further researched. In the cases of both Figs. 6.47 and 6.48,
the method of exciting field is completely not identical, and the exciting field of whole
cooling in Fig. 6.48 is the most complex. The applied magnetic field is not only high,
but also both size and orientation are restricted.
The scheme of the EDS Maglev using HTS PMs is discussed in Section 4.5.
The scheme of the EDS Maglev using HTS wires (1G or 2G HTS wires) is discussed
in Section 4.6.
These early schemes of the HTS Maglev had been discussed, before we decided on
the “Century” plan. After several years of research, we finally decided to choose the
scheme of Maglev vehicle of HTS bulk above PMs (see Section 6.26).