TAILIEUCHUNG - Pid Motor Control

Pid Motor Control | Lab IIPID More Op Amp Applications PID Motor Control 1 Lab IIPID More Op Amp Applications PID Motor Control REV 31 October 28 2002 Reading Proportional-Derivative-Integral PID Loops We re afraid the Text doesn t treat this topic except very indirectly. This indirect treatment appears in the sections of Chapter 4 on op amp stability and compensation. We ll hand you our rough notes on the topic. 1 Introduction Today s circuit looks straightforward a potentiometer sets a target position a DC motor tries to achieve that position which is measured by a second potentiometer. Lags cause the difficulty the correction signal is likely to arrive too late to solve a problem that the circuit senses. If that happens the remedy can make things worse. This motor control circuit is a classic feedback network called a PID circuit the circuit response ultimately will include three functions of the circuit error signal proportional. integral. and derivative. Stability is the central issue. We hope you ll find it gratifying to notice that today s circuit gives you a chance to apply several subcircuits that you have met before integrator differentiator summing circuit push-pull brought within feedback loop plus a differential amplifier the behavior of this last is familial but today is your first chance to build one out of op amps. This exercise also provides a first chance to use multiple op amps in one larger circuit and it returns you to the stability problems of Lab 10b. Today the remedies will be subtler than those we applied in the earlier lab. 2 PID Motor Control The task we undertake here looks simpler than it is. As we ve said all we aim to do is control the position of a DC motor s shaft by letting it drive a potentiometer and feeding back the pot s voltage. Here s the scheme Figure 1 Basic Motor-Position Control Loop Very Simple What could be simpler Not much on paper. But the challenge turns out to lie in keeping the circuit stable. The issue is fundamentally the same as .

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