298 Ë 8 New progress of HTS Maglev vehicle
Fig. 8.38:Guidance forces of the bulk sample with horizontal and vertical laying modes measured at
the PMG middle and field-pole positions in the case of the 30-mm FCH and the 15-mm WH.
mode to the vertical mode at the field-pole position. If considering the same space
in width for bulks, an approximate factor of 2 can be multiplied, indicating a further
improvement of the guidance force.
Table 8.5 further indicates that the levitation or guidance forces can be alter-
natively improved by changing the bulk-laying mode. At the middle of the PMG,
the maximum levitation force was approximately improved from 92.1 to 209.2 N,
corresponding to an increasing factor of 2.27, when the bulk-laying mode was chan-
ged from horizontal to the vertical one. While the maximum guidance force at the
maximum lateral displacement of 5 mm decreased approximately from−20.3 to−5.2 N,
indicating a decrease factor of 3.9. At the other measurement position of the field
pole, 10.2 times of improvement in the guidance forces and 1.28 times’ decrease in
the guidance forces were obtained when changing the bulk-laying mode from the
horizontal to the vertical one. Hence, in practical applications, thec-axis direction
of the bulk could be designed according to the applied field configuration to meet the
requirements on the load capability or stability of the levitation system.
Tab. 8.5:Maximum levitation forces and guidance forces of the bulk sample with different laying
modes in the case of 30-mm FCH.
Experimental conditions Field-pole position PMG middleMax.FLev(N) Horizontal modeVertical mode 58.4 (149.5×2) 104.6 (92.1×2)
Max.FGui(N) Horizontal modeVertical mode −17.3 (−×3.42) −2.6 (−20.3×2)
Note: In the vertical mode, (×2) means an approximate coeflcient of 2 considering the same laying
width facing the PMG surface as in the horizontal mode.