DC Motor Speed Control With PID Control

Tamaiyanthi, Armiham @ Arumugam (2005) DC Motor Speed Control With PID Control. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

DC motors are motors that run on direct current from a battery or DC power supply. DC is the term used to described electricity at a constant voltage. A DC motor has speed dynamics when mechanical properties such as inertia and damping as well as electrical properties such as inductance and resistance are taken into account. The controller's objective is to maintain the speed of rotation of the motor shaft with a particular step response. PID where P stands for Proportional controller will have the effect of reducing the rise time and will reduce but never eliminate the steady-state error. I stand for Integral control will have the effect of eliminating the steady-state error but it may make the transient response worse. And D stands for Derivative control will have the effect of increasing the stability of the system, reducing the overshoot and improving the 1transient response. The PID controller is designed by using Visual Basic program to generate a set of coefficients associated with a desired controller's characteristics. The controller coefficients are then included in an assembly language program that implements the PID controller. This program is used to activate the controller, calculate and plot the time response of the control system. When the program is run, it plots the time response of the system on the pc screen, assembles the PID assembly language program and loads/ runs the resulting. Speed control is investigated on the DC motor system with speed feedback.

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