motor free amps at voltages less than 12

[vamfun]

Originally Posted by Ether

PS - yes, I already know that a first approximation is that the ratio of free current to applied volts is constant, equal to the ratio of free_current_at_spec_voltage to spec_voltage.

I know you want some data, sorry don't have any.

I think this approximation would be true only if the drag torque was of the viscous friction type. Generally, i_free = T_free/kt. If T_free is from bearing coulumb losses then it would not vary with speed. So when you lower the voltage and the motor speed then I would bet i_free would remain fairly constant. There are some components of friction/motor losses that change with speed but I think they are generally small relative to coulumb friction.