[Ken Leung]

I am just wondering, after talking to Ulibrium online the whole morning about all these.... about how the voltage affects the torque-current curve?

I know that in the speed torque curve, stall torque and free speed is proportional to the amount of voltage you give.

So, when you give less power to the motor, under the same load the motor would feel the load heavier because it's a weaker motor... Say like you are giving the motor 6v instead of 12v, the stall torque is half the stall torque at 12v.

So what's the stall current when that happens? Is it the same, or is it half the stall current? However, I have a feeling that double the current is the case, because the motor is feeling double the load due to half power...

Another think I saw happening is that when you drive a robot around, and if you drive it at less than full voltage (like pushing the joystick halfway forward instead of full forward), the motor heat up faster. Do this mean it draw more current when you give it less voltage? This would be consistent with my theory that stall current is double when voltage is half...