SPEED CONTROL OF SINGLE PHASE INDUCTION MOTOR BY USING CYCLOCONVERTER

Abstract

Induction motors have the great advantages of being relatively inexpensive and very reliable. Induction motors
in particular are very robust and therefore used in many domestic appliances and used in industries as well. The induction
motor is known as a constant-speed machine, the difficulty of varying its speed by a cost effective device is one of its main
disadvantage. This thesis presents simulation and Implementation of step-down cycloconverter for speed control of single
phase induction motor. The cycloconverter is device that converts ac supply of one frequency into ac supply of different
frequency without any dc stage in between. It can be also consider as a static frequency changer and typically contains
silicon-controlled rectifiers. As the AC supply frequency cannot be changed, so the use of a thyristor controlled cycloconverter
which enables the control of speed in steps for an induction motor is solution for this problem. Implementation of the open
loop hardware by using the microcontroller and applying gate pulse to thyristor speed of Induction motor is controlled in
steps. Cycloconverter gives good direct speed control of induction motor without any intermediate DC stage conversion.