Considering battery powered BLDC motor having rated voltage and current specs, what is exact meaning of the rated "current"? Since BLDC motor is NOT powered by a DC current (enjoy the twisted logic of terminology) rather it is another device - a motor controller - which generated controlling AC phases in a form of PWM sequences, then, if I understand the "rated current" spec as a maximal current allowed from the rated maximal voltage, how could it be translated to the true motor spec? In other words if my understanding is correct stating that rated current and voltage are maximal specs drawn from the DC source, then these specs cannot even be applied to the motor directly! Hence my question.
For simplicity let's assume that efficiency of the motor controller is 100%, then how can we translate these manufacturer' provided (virtual) specs into actual specs of the motor itself? As we know the electromagnetic field and MMF which drives the rotor is caused by a current flowing through the coils of the stator, so we need to "translate" the rated current from manufacturer into the peak or RMS current of the motor phase(s). If it is so then how to do this translation? Assuming the peak of PWM driving phase is equal the rated voltage, can we get a peak and max RMS current of a single motor phase?
I am guessing that total RMS current of the 2 phases (out of 3) which are in ON state at any time should be about equal to the max "current rating" of the motor (minus whatever losses "on the way" through the motor controller), but I am not sure if this is correct - need your confirmation or denial :)
Added 4.29.18 : consider this example REX 30 motor from http://www.rotexelectric.eu/products/bldc-motors/rex-series/ Their units might be confusing, this motor is almost the same but cleanly defined parameters ( I am running this motor): http://www.nt-power.eu/doc/nt-power-datasheet-motor-15kw.pdf