Transfer function of a PID controller is: \$I\cdot s + P+\dfrac{D}{s}\$
Are there controllers like: \$A\cdot s^2 + B\cdot s + C+\dfrac{D}{s} + \dfrac{E}{s^2}\$ ?
If so, are they common? Why do people usually just use a PID controller?
Transfer function of a PID controller is: \$I\cdot s + P+\dfrac{D}{s}\$
Are there controllers like: \$A\cdot s^2 + B\cdot s + C+\dfrac{D}{s} + \dfrac{E}{s^2}\$ ?
If so, are they common? Why do people usually just use a PID controller?