Speed Control of Motor by Interfacing Technique

Abstract

Role of electrical drives is a major concern in industrial automation. Industrial applications use dc motors because the speed-torque relationship can be varied to almost any useful form for both dc motor and regeneration applications in either direction of rotation. Dc motors are often applied where they momentarily deliver three or more times their rated torque. In emergency situations, dc motors can supply over five times rated torque without stalling (power supply permitting). Dc motors feature a speed, which can be controlled smoothly down to zero, immediately followed by acceleration in the opposite direction without power circuit switching. And dc motors respond quickly to changes in control signals due to the dc motor's high ratio of torque to inertia. The system is intended to design here provides RS232 interface which is a standard for both PC and PLC. A set of commands is used to control drive.
Keywords - RS232; Dc motor; Microcontroller; Thyristor