I am trying to build a drone generator with a gasoline engine and a 14-pole,170KV, 2KW BLDC skateboard motor (this one). Before designing the system and running it, I wanted to clear out a fundamental doubt that has been troubling me. Details are as follows:
At a given voltage, how is the maximum output current that my generator can deliver related to the input torque at the generator shaft? Would increasing the input torque on the generator increase the current delivering capacity of my generator?
I am aware about the fact that at constant supply voltage (hence speed), a BLDC will draw different currents for different propellers due to difference in aerodynamic loading.
Also,in brushed permanent magnet dc motors, at a constant voltage, the motor will draw whatever current it needs from the source (with a little voltage drop) OR if I use a brushed dc generator, I will be able to generate larger currents (at the risk of burning my coils) at constant voltage (const. shaft speed).
Will the same hold true in case of a BLDC?
Please share your views.