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Need help on trying to control a motor speed with a PID circuit.


New Member
Hi everyone! I'm Buse. I'm trying to control a motor speed for a personal project. You can find the schematic of the circuit I found on a book. This circuit works with only the PID parts constructed. My problem starts when I add the other parts. For example, U1 opamp (top left) is supposed to control the motor like giving it an input and getting an feedback but I cant seem to work it out. To be honest I couldn't connect it the right way also... Any help is appreciated. ^^



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That's not a speed controller, it's a position controller - like a RC servo motor mechanism but with a voltage as the position command, rather than a pulse width.

To work as a speed controller it would need a motor with a DC tachogenerator for feedback; or you need to look for other circuits.


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Most Helpful Member
There was a member here that devised a PID speed control, but he has since pased and the name escapes me. Maybe a search of the forum would find it, he was from Australia I think and a really smart guy.


Well-Known Member
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The SuperPID is designed for the Triac control of a HS spindle (5krpm to 20krpm) Universal motor using router motors.
The feedback is via a 1pulse/rev retro-reflector device.
Uses a Picmicro processor
Although he hasn't been seen since 2014, his web site is still up.

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