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Originally Posted by russell
I dont think thats right. Dont know why, but something seems funny about it. For I think because you are plotting the speed at stall at the beginning then the rest of the time you plot the free speed. Something like that.
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Originally Posted by sciguy125
As far as I know, brushed motors are linear. Plot torque vs speed. 0 speed, stall torque is your first point. Full speed, 0 torque is your other point. Draw a straight line and you have your "curve."
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In fact, sciguy125 is mostly right, except that usually, you plot speed vs. torque with stall torque (the max.) at the extreme right of the x-axis, and the torque corresponding to free speed (i.e. 0 torque) at the origin.
Maybe you were thinking of current?