This really might be a dumb question, but voltage across 1 motor will NOT be the voltage of the battery (3S ~ 11.1V) during hover unless full throttle correct? I am on a school project and the team's EE says it is but that makes zero sense to me since motors are evaluated in rpm / V thus at each specific RPM there is a different voltage across the motors, and an increasing current draw with increasing voltage.
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Jeff,
Your "EE" is correct. The motor is receiving "full" voltage all the time. What happens is that the "duty cycle", or the amount of off vs. on time changes. At full throttle the duty cycle is 100% and the motor is in the "on" state all the time, at 50% throttle the motor is on half the time and off the other half, and finally at 0% throttle the motor is in the "off" state all the time. By rapidly pulsing the motor on and off we can control the rpm by changing the duty cycle. The motor is receiving full voltage in each on cycle. A benefit of this is that you get full torque at all speeds. If you were to measure the voltage at various speeds you would probably not get an accurate measurement with most multimeter s.
Regards,
Nathaniel ~KD2DEY