6.18 Guidance forces of the entire HTS Maglev vehicle Ë 207Fig. 6.72:Experimental results of guidance
forces of the whole vehicle under different
maximum lateral displacement [61].Fig. 6.73:Experimental results of guidance
forces with three people loaded [60].Figure 6.73 shows the experimental results for the guidance forces with three people
on the vehicle. The total loading weight was about 500 kg with a levitation height
(work height) of 20 mm. It can be seen that the guidance forces rapidly increased with
the decrease of the levitation height due to the increase in weight. The guidance force
at a vehicle lateral displacement of 6 mm was 921 N, and it was about twice that in the
no-load condition. However, the vehicle was not centered by 2 mm after the removal of
the horizontal lateral forces, and it was like the no-load condition. According to these
measured results, the previous conclusion about the guidance force of 1980 N may be
incorrect.
The previous guidance forces were defined as the forces that would compel
the carrier to return to its original location of the magnetic suspension balance
after lateral displacement of the carrier over the PMG. All of the above experiments
were conducted according to this definition.
In fact, the guidance force should be defined as the maximum lateral force for
which it does not leave the original position after applying lateral force. It is not precise
to identify the guidance forces from which its position cannot return to the origin. For
example, it is not appropriate that the maximum guidance force was affirmed to be
1420 N according to the lateral forces vanishing at about 11 mm for a FCH of 42 mm.