My own experience was that active braking was absolutely essential. It'll depend on the system, though.You could get better accuracy from a DC motor + slotted disk and opto sensor by triggering on both edges of the slot and reducing the motor drive on the leading edge ans actively braking on the trainling edge. So you stop from lower speed. The speed reduction could be as simple as turning off the power to let it coast before actively braking. Or apply two levels of braking.
It also depends on how accurate the final position needs to be, and the required response time.
You could also handle overshoots past the trailing edge of the slot by stopping the motor, then reversing slowly until the slot edge is detected. (For accurate positioning, you could always do this - whatever positioning method you use, end up by approaching the slot always from the same direction).
Statistics: Posted by stevend — Mon Dec 02, 2024 1:02 pm
