Explain error-rate control and output-rate control, Electrical Engineering

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Error-Rate Control, Output-Rate Control, and Integral-Error (Reset) Control

Let us consider a typical second-order servomechanism(containing two energy-storing elements) whose defining differential equation for obtaining the dynamic behavior of the system is given by

2338_Error-Rate Control and Output-Rate Control.png

where J, F, and TL represent, respectively, effective inertia, equivalent viscous friction, and resultant load torque appearing at the motor shaft; K = KpKaKm, where Kp is the potentiometer transducer constant (V/rad), Ka is the amplifier gain factor (V/V), and Km is the motor-developed torque constant (N·m/V) of the physical servomechanism shown in Figure; r is the input command and c is the output displacement, both in radians.

The block diagram of the servomechanism of Figure is given in Figure, in which the transfer function of each component is shown. Since the actuating signal is given by E = Kp(R - C), the block diagram may be simplified, as shown in Figure, in which TL is assumed to be zero for simplicity. The direct transmission function (forward path transfer function) for the system can be seen to be

2419_Error-Rate Control and Output-Rate Control1.png

The corresponding closed-loop transfer function is given by

 

555_Error-Rate Control and Output-Rate Control2.png

882_Error-Rate Control and Output-Rate Control3.png


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