MODERN SPEED CONTROL TECHNOLOGIES OF AC MOTORS
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TITLE PAGE
MODERN SPEED CONTROL TECHNOLOGIES OF AC MOTORS
BY
---
EE/H2013/01430
DEPARTMENT OF ----
SCHOOL OF ---
INSTITUTE OF ---
DECEMBER,2018
APPROVAL PAGE
This is to certify that the research work, "modern speed control technologies of ac motors" by ---, Reg. No. EE/H2007/01430 submitted in partial fulfillment of the requirement award of a Higher National Diploma on --- has been approved.
By
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Supervisor Head of Department.
Signature………………. Signature……………….
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External Invigilator
DEDICATION
This project is dedicated to Almighty God for his protection, kindness, strength over my life throughout the period and also to my --- for his financial support and moral care towards me.Also to my mentor --- for her academic advice she often gives to me. May Almighty God shield them from the peril of this world and bless their entire endeavour Amen.
ACKNOWLEDGEMENT
The successful completion of this project work could not have been a reality without the encouragement of my --- and other people. My immensely appreciation goes to my humble and able supervisor mr. --- for his kindness in supervising this project.
My warmest gratitude goes to my parents for their moral, spiritual and financial support throughout my study in this institution.
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Induction motors do not run at synchronous speed, they are generally fixed speed motors. In Industries mechanical loads should not only be driven but should also be driven at desired speed. Therefore, the need of speed control methods for induction motor arises. There are various methods of speed control for an induction Motor. In this work we discussed different speed control methods and their performance based on SPWM Inverter, harmonics reduction and speed-torque characteristics so as to analyze the most effective techniques among them considering the presence of harmonics as well as minimization of odd harmonics through Inverter.
TABLE OF CONTENTS
COVER PAGE
TITLE PAGE
APPROVAL PAGE
DEDICATION
ACKNOWELDGEMENT
ABSTRACT
CHAPTER ONE
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INTRODUCTION
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BACKGROUND OF THE PROJECT
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PROBLEM STATEMENT
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OBJECTIVE OF THE PROJECT
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SIGNIFICANCE OF THE PROJECT
CHAPTER TWO
LITERATURE REVIEW
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INTRODUCTION
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OVERVIEW OF THE STUDY
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OPERATING PRINCIPLES OF AC MOTORS
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HISTORICAL BACKGROUND OF AN AC MOTOR
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TYPES OF AC MOTOR
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REVIEW OF RELATED STUDIES
CHAPTER THREE
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METHODOLOGY
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CONCLUSION
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REFERENCES
CHAPTER ONE
1.0 INTRODUCTION
1.1 BACKGROUND OF THE PROJECT
An important factor in indust
rial progress during the past five decades has been the increasing sophistication of factory automation which has improved productivity manyfold. Manufacturing lines typically involve a variety of variable speed motor drives which serve to power conveyor belts, robot arms, overhead cranes, steel process lines, paper mills, and plastic and fiber processing lines to name only a few. Prior to the 1950s all such applications required the use of a DC motor drive since AC motors were not capable of smoothly varying speed since they inherently operated synchronously or nearly synchronously with the frequency of electrical input. To a large extent, these applications are now serviced by what can be called general-purpose AC drives. In general, such AC drives often feature a cost advantage over their DC counterparts and, in addition, offer lower maintenance, smaller motor size, and improved reliability. However, the control flexibility available with these drives is limited and their application is, in the main, restricted to fan, pump, and compressor types of applications where the speed need be regulated only roughly and where transient response and low-speed performance are not critical.
More demanding drives used in machine tools, spindles, high-speed elevators, dynamometers, mine winders, rolling mills, glass float lines, and the like have much more sophisticated requirements and must afford the flexibility to allow for regulation of a number of variables, such as speed, position, acceleration, and torque. Such high-performance applications typically require a high- speed holding accuracy better than 0.25%, a wide speed range of at least 20:1, and fast transient response, typically better than 50 rad/s, for the speed loop. Until recently, such drives were almost exclusively the domain of DC motors combined with various configurations of AC-to-DC converters depending upon the application. With suitable control, however, induction motor drives have been shown to be more than a match for DC drives in high-performance applications. While control of the induction machine is considerably more complicated than its DC motor counterpart, with continual advancement of microelectronics, these control complexities have essentially been overcome. Although induction motors drives have already overtaken DC drives during the next decade it is still too early to determine if DC drives will eventually be relegated to the history book. However, the future decade will surely witness a continued increase in the use of AC motor drives for all variable speed applications.
1.2 PROBLEM STATEMENT
In the last decade, DC motor was popularly and widely used in industrial application such as in the area of automation because dc motor is capable of smoothly varying speed since they inherently operated synchronously or nearly synchronously with the frequency of electrical input. But today the story has change in that variety of an AC motor speed controlled has been discovered and implemented.
1.3 AIM AND OBJECTIVES OF THE STUDY
The main aim of this work is to study different types of speed control of an ac motor. At the end of this project, reviews on different speed control methods and their performance based on SPWM Inverter, harmonics reduction and speed-torque characteristics shall be carried out.
1.4 SIGNIFICANCE OF THE PROJECT
Carrying out this work has led us to understand different ways of speed control of an ac motors, it comparison and has made us to come out with the best method of controlling speed of an ac motor.
CHAPTER TWO: The chapter one of this work has been displayed above. The complete chapter two of "modern speed control technologies of ac motors" is also available. Order full work to download. Chapter two of "modern speed control technologies of ac motors" consists of the literature review. In this chapter all the related work on "modern speed control technologies of ac motors" was reviewed.
CHAPTER THREE: The complete chapter three of "modern speed control technologies of ac motors" is available. Order full work to download. Chapter three of "modern speed control technologies of ac motors" consists of the methodology. In this chapter all the method used in carrying out this work was discussed.
CHAPTER FOUR: The complete chapter four of "modern speed control technologies of ac motors" is available. Order full work to download. Chapter four of "modern speed control technologies of ac motors" consists of all the test conducted during the work and the result gotten after the whole work
CHAPTER FIVE: The complete chapter five of design and construction of a "modern speed control technologies of ac motors" is available. Order full work to download. Chapter five of "modern speed control technologies of ac motors" consist of conclusion, recommendation and references.
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