Quote:
Originally Posted by ratdude747
A motor is most efficient when run exactly at the rated power output.
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Maximum power and maximum efficiency occur at two separate points on the motor curve for brushed DC motors.
Maximum power occurs when
P(out)=radial velocity * torque is maximized, which is at half free speed and half stall torque.
Maximum efficiency occurs when
P(out) / P(in), or
(radial velocity * torque) / (current * voltage) is maximized. This always occurs somewhere between the maximum power point and free speed (it varies from motor to motor depending on free current).