Root locus method in control system

1. What is root locus method in control system?
2. How root locus is useful for control system design?
3. What is root locus why it is used?

What is root locus method in control system?

In control theory and stability theory, root locus analysis is a graphical method for examining how the roots of a system change with variation of a certain system parameter, commonly a gain within a feedback system.

How root locus is useful for control system design?

Root locus design is a common control system design technique in which you edit the compensator gain, poles, and zeros in the root locus diagram. The root locus technique consists of plotting the closed-loop pole trajectories in the complex plane as k varies.

What is root locus why it is used?

The root locus plot indicates how the closed loop poles of a system vary with a system parameter (typically a gain, K). We can choose a value of 's' on this locus that will give us good results.