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8
GPU can be used for both - brushed and brushless generators. Please state the required generator type in your order.
The typical connection diagram for the brushless and brushed generator systems is shown in Figure 7 and Figure 8
respectively.
GPU can be used both with inline generators and geared generators. An example of a belt-driven generator is shown in
Figure 6. The ratio between the pulleys is chosen to keep the GPU input voltage under the 50 V limit
Figure 6 Belt-driven onboard generator example
In many cases, at low engine rpm, the voltage generated is less than 13 V, which means that the onboard battery will be
used for powering the unmanned aircraft systems. This is not an issue, since aircraft do not generally fly at low idle
settings for extended periods of time and the power requirements can be met by the onboard battery. The onboard
battery capacity needs to be calculated depending on actual mission profile of the UAV, taking into account possible
aircraft descend time as well as desired pre-flight operation time- please see section 10 for more details and battery
capacity estimation formula. Please use adequate safety factor for your battery capacity estimation results.
