Speed Control of DC Motor by Pulse Width Modulation

Abstract

Direct current (DC) motor has already become an important drive configuration for many applications
across a wide range of powers and speeds. The ease of control and excellent performance of the DC motors will
ensure that the number of applications using them will continue to grow for the foreseeable future. The role of
speed control in dc motors is very crucial in the achievement of desirable outputs. There are several methods for
controlling the speed of dc motors. All the control strategies utilize the output speed error and its derivative as
feedback damping signals. But Pulse width modulation is an effective method for adjusting the amount of power
delivered to an electric load. The main advantage of PWM is that power loss in the switching devices is very low.
Accurate and precise control of small DC motors can be done effectively and efficiently without using complicated
circuitry and costly components.