Environmental Engineering Reference
In-Depth Information
Eciency vs. Distance
120.00%
100.00%
80.00%
0.1 m
0.05 m
0.2 m
0.5 m
1 m
60.00%
40.00%
20.00%
0.00%
0.000001
0.0001
0.01
1
100
10000
Distance
FIGURE 6.19
Efficiency of a WPT system for different separation distances.
distance between the two coils increases, the mutual coupling between the
coils decreases as illustrated by
Equation 6.7
.
The distance factor has no effect
on the other performance indicators of the WPT system. In this simulation,
the distance between the two coils varied from 5 to 100 cm, and the efficiency
of the system over a range of frequencies of 1 to 1000 GHz is plotted in
With reference to
Figure 6.19
, it is observed that for shorter distances (i.e.,
5 and 10 cm), the optimum efficiency band remained more or less the same due
to the strong coupling between the coils. As the separation distance started
to increase, the efficiency of the WPT system decreased. At a distance of
50 cm, the peak attainable efficiency of the system dropped to around 80%.
This reduction in the efficiency of the WPT system continued and it dropped to
around 30% when the separation distance between the coils was lengthened
to 100 cm, which was twice of its counterpart of 50 cm. After conducting
the simulations, the relationship between the WPT efficiency and the design
factors was known, and it is thus possible to leverage the understanding onto
the experimental design of an optimal WPT system.
6.2.3
Characteristics of the WPT System
Experiments were conducted to observe the performance of the WPT system
with respect to the three more prominent design parameters: (1) frequency,
(2) distance, and (3) load. The rest of the design parameters were also in-
vestigated; however, their effects were not as significant as the three chosen
parameters.
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