Tool and Viewer Quick Start

Tuning Compensators

The SISO Design Tool simplifies the task of designing compensators. Regardless of which views you have open--root-locus, Bode diagrams, or Nichols plots--there are three ways to alter compensator designs:

• Interactive graphics let you tune compensator gains and adjust dynamics (poles and zeros).
• Right-click menus allow you to add/remove dynamics and customize the view (for example, add a grid, zoom in/out, add design constraints, or customize plot properties).
• The Edit Compensator window is a GUI with fields for keyboard entry of gain values and pole/zero locations.

You can perform any of these tasks in the root locus,  open-loop and prefilter Bode diagrams, or Nichols plots in the SISO Design Tool. Once you've added dynamics to your compensator, you can dynamically update pole and zero locations by dragging them.  The SISO Design Tool is designed so that a change in any one view is automatically reflected in other views in the GUI. In particular, the Current Compensator panel always reflects the current compensator design. The next sections discuss some of the ways you can tune compensators in different SISO Design Tool views.

You can tune compensators in any of the views in the SISO Design Tool. These views include the following:

• Root-Locus
• Open-Loop Bode Diagram
• Open-Loop Nichols Plot
• Prefilter Bode Diagram

Configuring the Feedback Structure

Root-Locus