7.6 Three-dimensional modeling and simulations Ë 245Tab. 7.3:Levitation force simulation of HTSC over monopole PMG with different PM heights.
Height TD (mm) Width TB (mm) Cross-section area (mm^2 ) MLF(N)
40 40 3200 78.14
42 40 3360 82.65
44 40 3520 84.72
46 40 3680 86.64
48 40 3840 88.43
50 40 4000 90.04
52 40 4160 91.64
54 40 4320 93.08
56 40 4480 94.42
58 40 4640 95.68
60 40 4800 96.85when TB changes from 40 to 60 mm, the height of the PM keeps a constant value of
40 mm. The MLF of the HTSC increases with the cross-sectional area of the PMG. MLF
increases faster when the height of the PM increases, compared with an increase of the
width of the PM. Extremely, when the width extends to a very large value compared to
its height, the MLF may tend to be constant for certain HTSC, which is similar to the
case of changing the height.
One can see that the MLF increases rapidly while the cross-sectional area of the
PMG increases in the initial stage. When the cross-sectional area gradually becomes
larger, the increasing tendency of the MLF gradually becomes smaller. Regardless of
whether it is the height or width that is increasing, the MLF always increases with the
cross-sectional area.
Fig. 7.18:Maximum levitation forces of the HTSC above the PMG with different cross-sectional areas.
The width/height of the PM labels is shown on the top horizontal axis.