6.18 Guidance forces of the entire HTS Maglev vehicle Ë 205Tab. 6.15:Guidance force under different FCHs [60]. (Disp., displacement; N, forces unit (newton);
FCH, field cooling height).
Disp. (mm) FCH (mm) Disp. (mm) FCH (mm)
12 26 42 12 26 42
1 215 207 250 19 3364 2422 1515
2 592 414 450 18 2682 2120 1295
3 1026 603 600 17 2361 1834 1070
4 1391 802 725 16 1932 1533 885
5 1713 987 835 15 1580 1301 665
6 2033 1122 945 14 1244 1073 470
7 2330 1289 1085 13 886 767 295
8 2521 1465 1165 12 590 606 120
9 2685 1610 1275 11 354 375 0
10 2883 1734 1355 10 110 190 0
11 3003 1913 1420 9 20 24 0
12 3220 2038 1510 8 0 0 0
13 3350 2151 1475 7 0 0 0
14 3418 2263 1565 6 0 0 0
15 3726 2399 1660 5 0 0 0
16 3834 2517 1740 4 0 0 0
17 3941 2659 1785 3 0 0 0
18 4117 2744 1845 2 0 0 0
19 4246 2851 1930 1 0 0 0
20 4407 2908 1980 0 0 0 0The experimental data showed that the lateral guidance forces had a large hysteretic
effect. The guidance forces rose rapidly when the vehicle left its initial position, and
the rate of increase became smaller as the vehicle moved further away from its original
position as shown in Fig. 6.70. The guidance forces dropped rapidly when the vehicle
moved back to its initial position from the maximum lateral displacement of 20 mm,
and vanished at about 11 mm for a FCH of 42 mm. This showed that the trend of the
vehicle to return to the original position had disappeared at 11 mm. Thus, it was just
a kind of pseudo-guiding force. The true meaning of guidance force was to direct
the suspension carrier back to the original point, i.e. the guidance forces should be
restored to the original center position without an additional external force. This result
implied that the maximum lateral displacement is equal to or less than 11 mm, for
the vehicle to be able to return to the initial point. When the vehicle is pushed away
from the center position 11 mm (lateral displacement), it should return to the origin
position. The maximum guidance force is equal to or less than 1420 N for a FCH of
42 mm with a free levitation height of 26 mm.
These measurement results were obtained under the condition of a slow measu-
rement rate. Because of the large hysteretic effect in guidance force measurements,