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What is proportional control  and  define it?

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PROPORTIONAL CONTROL ACTION (P)

The action of a controller whose output signal V (or Φ) is pro- protonate to the deviation θ.

θ is the difference between the measured value of the control- led condition θo and the command signal θi.

V ∝ -θ

V = -K1 θ

The negative sign denotes that the correction signal is opposite in direction to the deviation. K1, a constant depending on the controller characteristic, is called the proportional action factor.

Potential correction Φ (change of actual controlled condition γo) is proportional to the movement of the correcting unit (which depends on V).

Φ ∝ V

Φ = C1 V

 

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