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

busevaran

New Member

• Jun 9, 2021

• #1

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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rjenkinsgb

Well-Known Member

Most Helpful Member

• Jun 9, 2021

• #2

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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shortbus=

Well-Known Member

Most Helpful Member

• Jun 10, 2021

• #3

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.

 

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Pommie

Well-Known Member

Most Helpful Member

• Jun 10, 2021

• #4

Did you mean http://chemelec.com/ ?

Mike.

 

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shortbus=

Well-Known Member

Most Helpful Member

• Jun 11, 2021

• #5

Pommie said:

Did you mean http://chemelec.com/ ?

Mike.

Click to expand...

No, it was Roman Black, or Mr.RB as he was sometimes known, thought of it later in the evening. Chemlec was from Canada.

Roman Black was the innovator of the SuperPID speed controller. But it seems like his work isn't available now that a company is selling them for profit. http://www.romanblack.com/cool.htm

 

MaxHeadRoom78

Well-Known Member

Most Helpful Member

• Jun 11, 2021

• #6

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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shortbus=

Well-Known Member

Most Helpful Member

• Jun 11, 2021

• #7

MaxHeadRoom78 said:

Although he hasn't been seen since 2014, his web site is still up.

Click to expand...

His kids are doing that as a tribute to his legacy. Not exactly sure when he passed though. Chemelec's site is the same way.

 

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Pommie

Well-Known Member

Most Helpful Member

• Jun 11, 2021

• #8

Didn't know Roman wasn't around anymore. Another very talented individual lost.

Mike.