Study of AC Motor Control System using PLC

Abstract

The focus of this paper is on the control of AC motor using Programmable Logic Circuit. This project work covers PLC architecture, PLC programming basics and use of Human Machine Interface (HMI). Thus we will be implementing AC motor speed control system using the Variable Frequency Drive (VFD). Unlike in a DC motor, where you send power to the inner rotor, in an AC motor you send power to the outer coils that make up the stator. The coils are energized in pairs, in sequence, producing a magnetic field that rotates around the outside of the motor. The monitoring control system of the A.C. motor driven by VFD and controlled by PLC proves its high accuracy in speed regulation at constant-speed-variable-load operation.