dc motor position control

praondevou

Joined Jul 9, 2011
2,942
I just assume your second potentiometer IS connected to the motor shaft, so when the motor turns it gets to the position where both potentiometers have the same value, but because of it's inertia it overshoots. So now the circuit gives the command to turn into the other direction where the same thing happens. This is probably why it oscillates back and forth.

You need an additional circuit that turns of the the FETs when the difference between the two wiper voltages is lower than a certain value. In reality you cannot adjust two potentiometers to EXACTLY the same value, there will always be a small difference.
 
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