Description
ABSTRACT
This project investigates the electronic starter for the single phase induction motor that incorporates both short circuit and overload protection. The starter is used for switching and protecting the electric motor from the dangerous overloads by tripping. It reduces the starting current to the AC induction motors and also reduces the motor torque.
TABLE OF CONTENTS
COVER PAGE
TITLE PAGE
APPROVAL PAGE
DEDICATION
ACKNOWLEDGEMENT
ABSTRACT
CHAPTER ONE
INTRODUCTION
1.1 BACKGROUND OF THE PROJECT
- AIM/OBJECTIVE OF THE PROJECT
- SCOPE OF THE PROJECT
- LIMITATION OF THE PROJECT
- SIGNIFICANCE OF THE PROJECT
- APPLICATION OF THE PROJECT
- FUNCTION OF OVERLOAD PROTECTION
CHAPTER TWO
LITERATURE REVIEW
- OVERVIEW OF INDUCTION MOTOR
- BASIC PARTS OF AN INDUCTION MOTOR
- OVERVIEW OF SINGLE PHASE MOTOR
- TYPES OF INDUCTION MOTORS
- APPLICATIONS OF SINGLE PHASE INDUCTION MOTOR
- ADVANTAGES OF INDUCTION MOTOR
- REVIEW OF STARTING METHODS OF SINGLE PHASE MOTOR
- REVIEW OF RELATED STUDIES
CHAPTER THREE
METHODOLOGY
- BASICS OF THE SYSTEM
- SYSTEM BLOCK DIAGRAM
- SYSTEM CIRCUIT DIAGRAM
- CIRCUIT DESCRIPTION
- CIRCUIT DIAGRAM
- SYSTEM INSTALLATION
CHAPTER FOUR
TESTING AND RESULTS
- HOW TO SELECT AN AC MOTOR
- ADVANTAGES AND DISADVANTAGES
- TROUBLESHOOTING AN AC MOTOR AND ITS CONTROLLER
- PROPERTIES OF AN AC MOTOR
- LIFETIME OF AN AC MOTOR STATER CONTROLLER
- REQUIRED MAINTENANCE FOR AN AC MOTOR
- AC MOTOR WIRING
- AC MOTOR GLOSSARY
CHAPTER FIVE
- CONCLUSION
- RECOMMENDATION
CHAPTER ONE
5.1 INTRODUCTION
In general, frequently we use motors in many electrical and electronic appliances such as fan, cooler, mixer, grinder, escalator, lift, cranes, and so on. There are different types of motors such as DC motors and AC motors based on their supply voltage. Furthermore, these motors are classified into various types based on different criteria. AC motors are further classified as Induction motors, Synchronous motors and so on. Among all these types of motors, a few types of motors required to be operated with certain conditions (Shi et al., 2012). For example, we use an electronic starter for a single-phase motor to facilitate smooth start.
A starter is a device that controls the use of electric power to an equipment usually, a motor. As the name implies, starters ‘start’ motors. They can al stop them, reverse them, accelerate them and protect them.
1.2 PROJECT OBJECTIVE
To build an electronic starter for a single phase induction motor, that incorporates short circuit and overload protection.
1.3 SCOPE OF THE PROJECT
Starters ‘start’ motors. They can al stop them, reverse them, accelerate them and protect them. Protection Scheme of Single phase Induction Motor is used for switching and protecting the electric motor from the dangerous overloads by tripping. It reduces the starting current to the AC induction motors and also reduces the motor torque.
1.4 LIMITATION OF THE PROJECT
This motor starter is simply an electronic switches designed to control larger current loads typical of motor control. They may be small and similar to the light switches in your home, or they may be much larger dedicated switches designed for control of high amperage circuits. This motor starter is Triple Pole devices (switch 2/3 lines). This device was built using Normally Closed (STOP) and Normally Open (START) momentary contact switches and normally close (reversing) switch.
1.5 SIGNIFICANCE OF THE PROJECT
- It is a Wear less electronic switch for a long life
- Common device for all motors up to 3kW
- Assembly in terminal box possible
- Blocked electronic during steady state
- The load or the maximum start-up time of 5s define the cut-off point
- Safe function in complicated power grids
1.6 APPLICATION OF THE PROJECT
This device can be used in the following places:
- workshops
- industries
- electronics hobbyist, etc. for protecting, and controlling the movement and direction of an AC motor
1.7 FUNCTION OF OVERLOAD PROTECTION
Overload refers to when too many devices are connected to a circuit or when electrical equipment is made to work beyond its rated capabilities. They protect the motor by sensing current going to the motor.
CHAPTER FIVE
- CONCLUSION
Motor Starters are switches specially designed for starting, stopping, reversing and protecting motors. A motor starter contractor is a combination of devices used to start, run, and stop an induction motor based on commands from an operator or a controller. Ac motor will typically operate at 220V, 1-phase, 60 Hz and has a control voltage of 220 VAC.
Overload Relays are inexpensive, however the result of selecting the wrong one for the application can be catastrophic for your motor. The set objectives were achieved: Design of an electronic starter that provided both short circuit and overload protection.
5.2 RECOMMENDATION
This project is designed to be used in engineering lab and industries and wherever the need for movement of other machines or appliances. And should be used and maintain by a qualified personnel. The areas of improvement in the project include:
- Implementing an alternative electronic starter that is current sensitive and accurate to ensure protection of both the motor and equipment connected to
- Design of a less bulky system, preferably program base that works instantly in the case of an
- Implementing an automatic reset electronic
