Servo control without integral action

[square173205]

Is it possible to control servo system without integral action? Here is the method to control it with modified proportional action only;

 

http://hecoaustralia.fortunecity.com/digital3/ftsc3.htm

[swansont]

Without reading the link, I can say that yes, it is possible. Proportional gain only will work to some level of performance.

[tvp45]

Is it possible to control servo system without integral action? Here is the method to control it with modified proportional action only;

 

http://hecoaustralia.fortunecity.com/digital3/ftsc3.htm

 

I too have not read the link, but it is absolutely possible, in general, to use p only, pd only, or pi only (though God help you with instability on this one). Modified proportional is simple and often used, for example, in box heaters for electronic instruments where a few degrees of steady state error is no big deal compared to the cost of a real pid controller.

 

A couple years ago, I built a two axis surgery table using hydraulic servos. Although I used pid, I put an off switch on the i so that, during the painstaking part of the surgery, the table would absolutely stay still wherever it was.

 

So, yes.

[square173205]

I too have not read the link, but it is absolutely possible, in general, to use p only, pd only, or pi only (though God help you with instability on this one). Modified proportional is simple and often used, for example, in box heaters for electronic instruments where a few degrees of steady state error is no big deal compared to the cost of a real pid controller.

 

A couple years ago, I built a two axis surgery table using hydraulic servos. Although I used pid, I put an off switch on the i so that, during the painstaking part of the surgery, the table would absolutely stay still wherever it was.

 

So, yes.

 

Isn't it a regulator?

[tvp45]

Isn't it a regulator?

 

Sorry, I don't understand. What do you mean by regulator?