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I need to be able to control a fairly small electric motor from a PC.
To clarify, the motor doesn't need any kind of independent power supply, it can be powered by whatever is most convenient. Likewise it does not need to operate independently of a computer, but be directly controlled by a computer.
As for sending the signal, whatever is most convenient. USB would be nice if possible.
Finally, for the power of the motor, I'm still not exactly sure how powerful the motor needs to be. The propeller is only going to be 20 mm in diameter at most, so the motor only needs to operate fast enough to be within the propeller's operating range. I'm not familiar with propeller dynamics at the moment, so that's something for me to figure out. Given that RC helicopters have motors at about 5-10 V, and 5-10 amps, I'd be considering small motors in that range.
I'm still not exactly sure how powerful the motor needs to be. The propeller is only going to be 20 mm in diameter at most, so the motor only needs to operate fast enough to be within the propeller's operating range.