Lag Compensator Overview

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Questions and Answers

What is the primary purpose of a lag compensator in a control system?

To introduce high-frequency gains
To increase the system's transient response speed
To reduce steady-state error (correct)
To enhance stability margins

How does the introduction of a lag compensator affect the phase shift in a control system?

It results in zero phase shift
It has no effect on phase
It introduces a phase lead
It introduces a phase lag (correct)

What is a defining characteristic of the pole-zero configuration in a lag compensator?

The pole is closer to the origin than the zero (correct)
The pole is located farther from the origin than the zero
The pole and zero are at the same location
The zero is eliminated from the configuration

What effect does a lag compensator have on the response time of a system?

<p>It increases the rise time and settling time (A)</p> Signup and view all the answers

Which of the following statements is true regarding the performance of a lag compensator?

<p>It can potentially improve steady-state accuracy (C)</p> Signup and view all the answers

Flashcards

Lag Compensator Function

A control device that improves steady-state system performance by adding a low-frequency pole-zero pair where the pole is closer to the origin than the zero.

Steady-State Improvement (Lag)

Increases low-frequency gain, hence improves accuracy in the final outcome (steady state).

Phase Lag (Lag Compensator)

Introduces a negative phase shift, reducing system stability margins.

Transient Response (Lag)

Slows the system's initial response, increasing rise and settling times.

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Pole-Zero Location (Lag)

The pole is located closer to the origin than the zero. (pole < zero).

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Study Notes

Lag Compensator

A lag compensator enhances a system's steady-state response, typically by decreasing steady-state error.
It achieves this by introducing a low-frequency pole-zero pair, with the pole positioned closer to the origin than the zero.
Improves steady-state accuracy by increasing low-frequency gain.
Introduces a phase lag, potentially reducing system stability margins.
Reduces transient response speed, leading to increased rise and settling times.
Pole location is closer to the origin than the zero.