The amount of change in open-loop gain needed to make a closed-loop system unstable is known as the gain margin.

## What is gain margin in Nyquist plot?

The control system is stable if the gain margin is greater than one.

## Why is gain margin important?

The degree to which the system will oscillate without limit is known as the gain margin.

## Is gain margin always positive?

There is a When the gain margin is positive and phase margin is negative, the system is: Positive Stable.

## What is the gain margin of the Bode plot never crosses degrees?

The gain margin is infinite if the phase never crosses -180 degrees. Peak and troughs in your curves can lead to instability in the system if you are very close to the 0dB line or the -180 degree line.