How can i choose a safe wire gauge for a motor? I know the power output is given by Power = current * voltage, but in most cases the current will be relatively low due to back EMF, is that correct?
In that case, how can i determine how much current the motor will draw normally? Is there a rule of thumb of what is the max current draw, based on nominal power and voltage?
I see motors for electric bikes and cars with nominal current (derived from power/voltage) over 100amps, but the wires don't seem very thick. Judging from AWG tables, it would take some very beefy wires to handle that much current. Is that because in most cases the motor will draw much less than the nominal current?