Yes, this is true, but what goes into the ESC is DC.

At the risk of being to technical... What is actually going to the motor is a pulsed DC that has varied pulse width and amplitude... and of course, phase. Three phases as noted by the three wires and works the same as your compressor motors do.

The pulse width determines the RPM and the amplitude determines the power (the current it (the motor) draws and the amplitude, and of course, the prop in use). That little ESC does a lot of work..

If you over prop, the ESC will cause the motor to "surge" becuse it is attempting to draw more than the ESC is capable of providing.

This is of course over-simplification of what is happening, but is a basic idea of what goes on between the ESC and the motor.

CGr.