1.1 Introduction
The electricity drive system used in many industrial application, require higher performance, reliability and variable speed due to its ease of controllability. The speed control of industrial motor is very crucial in applications where precision and; protection are very important. The purpose of motor speed control is to take a signal representing the required speed and to drive the motor at that speed.
The control of motion of a motor could be a flat-belt application, flow control application or mixing of substances. Various types of electrical motors are used to provide mechanical motion in industrial application includes A.C motors such as induction motors, D.C motors, servo or stepper motors. Each type of these motors is used in industries depending on the application required. The motion of a D.C motors can be controlled using a D.C drive which changes the speed and direction includes rectifiers with a series resistor that converts standard A.C supply into D.C and supplies it to the motor. Through a switch and a series resistor to change the speed and direction of rotation of the motor.
Recently, due to the fast growth in technological development, the drives used in controlling the speed and direction of rotation of motors used in industrial processes are incorporated with built-in microcontrollers.
Microcontroller can provide easy control of industrial motors; they are capable of providing programmable facilities, massage display on LCD, precise control an d also protection when used to control t he speed of motors.
Furthermore, to control the speed of most D.C motors used in industries, variable voltage D.C power source are needed. When a D.C motor is switched on, the motor starts gaining speed and if you switched off the power supply when the motor has not reached its maximum rated speed, it starts to slow down. This is in line with the principle of pulse width modulated (PWM) control in which switching on and off of the supply to the motor are done in quick succession. The motor rotates at a slower speed between zero and full rated speed.
1.2 Purpose of Study
The purpose of the study is to design and construct a Micro Controller Based Industrial Machine Frequency Control that can provide easy control of industrial motors and achieve a system with constant speed at any load condition.
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