284 Ë 8 New progress of HTS Maglev vehicle
shows that, for the no pre-load case, the levitation forces decreased from 70.471 to
60.808 N when S2 initially and finally crossed the center position. Thus, 14% of the
levitation forces were reduced due to lateral movement in the experimental time in
this case. For the pre-load case, the levitation forces also decreased with the increase
of the lateral movement, but the levitation forces were obviously larger than that in the
no pre-load case after the fourth time across the center position. The levitation forces
started from 63.997 N and decreased to 62.423 N when the last time it went across the
center position, i.e., only 2.5% of the initial levitation forces was reduced due to lateral
movement, so the levitation force decay was also successfully suppressed in this
continuous multi-times lateral pre-load implementation.
Figure 8.26a shows the guidance forces variation for the S1 sample moved across
the Halbach PMG. The second value jumped to 8.896 from 7.771 N for no pre-load case.
In succession, the value decreased to 8.567 N and the last guidance force was 8.321 N.
Fig. 8.26:Guidance forces dependence on the lateral movement times in the continuous multi-time
no pre-load and pre-load procedure above the Halbach PMG. (a) S1, (b) S2.