Lithion-Ion Batteries

[Ether]

Originally Posted by ToddF

Running the math, the quoted max power actually equals the max current x max voltage. Derating to the 12 V on a FIRST robot (nominally) gives 792 Watts.

792 is the electrical power input to the motor, not the mechanical power output.

For reference, the brushed motors used in FRC all have less than 50% efficiency at max power. Brushless motors share many of the same losses that brushed motors have, like windage, bearing friction, eddy currents, winding resistance, etc etc. I doubt that brushless motors are anywhere near 100%.

Sensorless brushless motors cannot operate at high torque at low speeds because of commutation issues.