This is a hypothetical question but it's been bugging me for a while.
Lets say I hook up a DC motor with a propeller on it to a 10v battery and let it run.
Then lets say I hoop up a second identical DC motor and prop to a 100v battery, but with a PWM controller. And lets say I tuned the PWM duty cycle so that the RPMS of the motors are identical.
The power output of the props should be identical now as well, since it's related only to the RPMs.
Lets also say that hypothetically the mosfets in the PWM controller have 0 on resistance, and switch instantly.
Will both systems be identical in efficiency? Or are there some inherent losses due to the PWM throttling?