I am building a robotic actuator that will be backdrivable, this robot will have pretty low RPM. I will be using brushless DC motors. I am trying to figure out requirements for the power source. I have the motor data sheet, but we would like to run the motors at higher voltages to get more juice out of them. I know the required torque the motors would need to produce. Below is the derivation I used to find the required current and power. When I plug in all the known values, I get numbers that seem inaccurate. For instance, if I say req'd torque = 2.5 N-m, Kv = 473, max RPM = 50, I get current = 123 A and req'd power = 1.6 Watts.
I would really just like to know if I am going about this correctly as far as the calculation of the req'd values. I am also wondering if power required for stall torque would be equal to power required for no-load max RPM?
*The 1.25 is a safety factor recommended on one of the links below. Also Ia = current of the armature. I assumed this was the same as req'd current but I am not sure.
Here are two links I used for my derivation: