Loop Gain for Stability Margins Avoid This Mistake - Classical Feedback Control - Section 2 Module 6
When the need to determine loop gain arises, having a sign error in the controller is a common mistake. This video identifies the source of this mistake and provides simple instruction for correction. First, we motivate the problem with a suspicious Nyquist plot. We then use Kalman's Identity to define loop gain through the return difference transfer function. A simple architecture for a tracking controller and a regulator is provided and loop gain is identified. Finally we return to the suspicious Nyquist plot and a loop gain correction involving a simple sign change to the dynamic controller or compensator output equation is explained.
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