8.4 Some developed designs of the HTS Maglev vehicle system Ë 313Fig. 8.54:PMG I (a), PMG I (b) and PMG II (a) and PMG II (b) are asymmetric PMG designs. PMG I and
PMG II represent the original symmetric PMG designs.
Tab. 8.10:Guidance force increase of the bulk YBCO above the four asymmetric PMGs compared to
the two symmetrical PMGs.
PMG I PMG I (a) PMG I (b) PMG II PMG II (a) PMG II (b)Increase magnitude (N) 0 1.5 1.5 0 2.4 3.1
Increase percent (%) 0 6.5% 22.4% 0 10.1% 12.9%
To evaluate the improvement effect on the guidance forces by the asymmetrical
PMG designs, the finite element method was used to calculate all the magnetic field
distributions from those PMGs in Fig. 8.54. The 2D simulation program [54] was
used to calculate the guidance forces with the lateral displacement ofx=0–25 mm
above the six PMGs depicted in Fig. 8.54. The calculation parameters used were
following: a rectangular bulk YBCO with dimensions 30 mm width, 36 mm length,
and 15 mm thickness, FCH=30 mm, and WH=15 mm. Table 8.10 shows results from
the calculations. Thus, with the assumption of an asymmetric curved PMG, the HTS
Maglev vehicle system will allow the vehicle to overcome larger centrifugal forces and
run with the small or even zero lateral displacement when traveling on a curved path.
From the viewpoint of the practical engineering assembly, the additional PMs
will be directly assembled out-board of the original symmetric PMG of the straight
line when the guideways need to offer a larger guidance force or have a curvature. The
assembly of the outside magnets will be similar to the original assembly of the original
PMG. Thus, it is simple, feasible, low-cost, and widely applicable with any kind of