I'd like to know if someone could help me to tune my PID controller. I'm new in the world of control systems and I'm stuck with the tuning.
I've been working in the next system of a DC motor that comes from the modeling of the system. I used real variables to get J B K.
I've tried with Z-N tuning method, but it does not seem to work.
First of all, with this method I opened the loop and increased little by little the P gain. I expected the system to oscillate but it does not happen, it always behaves like a linear system.
This was the result:
This is the DC motor's TI that I'm using:
The variable J (inertia) is expressed in gcm2, K in mNm/A and the viscous friction B constant I calculated from the 2nd Newton L.
Does anyone have a tip for my system, or am I doing something wrong?