Question

Why negative feedback is preferred in the control system?

Answer 1

Negative feedback (or balancing feedback) occurs when some function of the output of a system, process, or mechanism is fed back in a manner that tends to reduce the fluctuations in the output, whether caused by changes in the input or by other disturbances.



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Answer 2

Answer:

The purpose of feedback in a control system is to compare the output signal to the input signal after sampling the output to check for errors ( deviation from the desired result).

Explanation:

In the control system, it is preferable to receive negative feedback. The system is more stable thanks to negative feedback, which also rejects any disturbance signals and is less susceptible to changes in parameter values. Therefore, negative feedback is taken into account in control systems.

Positive feedback increases the error between the system output and the reference input, R(s). The negative feedback control system's block diagram is depicted in the accompanying picture.

• Feedback lowers a system's total gain, with the amount of reduction varying according to the open-loop gain of the system.
• Negative feedback also improves system bandwidth and input and output impedances while lowering distortion, noise, and susceptibility to outside changes.
• Negative feedback typically encourages stability, whereas positive input frequently causes instability through chaotic, oscillatory, or exponential growth. Negative feedback tends to lessen the effects of perturbations and encourage the settling to equilibrium.
• The system is more stable thanks to negative feedback, which also rejects any disturbance signals and is less susceptible to changes in parameter values. Negative feedback is therefore taken into account in control systems.