Hello,

I am new to Electric flight.
Since brushless motors are essentially 3 phase motors, why is the RPM related to voltage, as in KV?
The ESC generates a 3-phase control that must force the motor to rotate at a synchronous RPM, regardless of the voltage (within limits of course).
If a 3-phase motor can't stay synchronous to the ESC, then it will operate at a very low efficiency as it tries to "catch-up" with the ESC driving frequency.
Therefore, as I read in one forum, "KV is RPM per volt at, no load, installing a prop will load the motor with consequently lower RPM".
What happened then with the synchronous drive from the ESC?
Shouldn't the motor RPM remain constant with different loads as long as the ESC driving frequency does not change?

Dan