The speed control of induction motor is done at the cost of decrease in efficiency and low electrical power factor. Four induction motors each supplying 120 kw at a power. A force is induced in a conductor that has a current going through it and placed in a magnetic field. Pdf design and control of the induction motor propulsion of. Induction motors induction motors are the most commonly used prime. Induction machine control and simulation c 2003 james l. Singlephase induction motor threephase induction motor singlephase induction motor there are probably more singlephase ac induction motors in use today than the total of all the other types put together. The problem of induction gilbert harman department of philosophy, princeton university sanjeev r. Loganathan umanand, does not currently have a detailed description and video lecture title. Induction motors despite the fact that the threephase motor has more phases than the singlephase motor, the singlephase motor is a much more complex machine. Induction machines are perhaps the most widely used of all electric motors. This paper deals with a methodology for presizing the induction motor propulsion of an electric vehicle ev. The ac induction motor is the most used electrical motor in industrial applications worldwide. Mostafa elshahed objectives learn a brief history of the electrical power systems construction.
Syllabus of bachelor of technology in electrical engineering 4th semester electrical machinesii. Induction motor 1 chapter 3 induction motor bee23 electrical machine power system 2 learning outcomes. The starting device adds to the cost of the motor and also requires more space. An887, ac induction motor fundamentals microchip technology. You should also make a dc measurement of stator winding linetoline resistance using a dmm. As with many systems, this generalizes to different numbers of phases with little difficulty. Synchronous machines synchronization verify that the phase sequences of the two systems are the same. Cross section of squirrel cage rotor bars nema class a,b,c,d. But, in the entire history of the course, no one has ever been able to detect one. Massachusetts institute of technology mit opencourseware.
The course notes are intended to serve as the primary references for this course, and were developed over the years during which the course has been offered. Singlephase motors have only two power source supply lines connected. A 3phase induction motor stator delta connected, is carrying full load and one of its fuses blows out. The motor is mounted in a test rig that allows one to control the torque applied to the motor shaft and to measure both rpm and torque.
A rotating magnetic field is set up on the stator by using distributed windings and a 3phase ac supply. Application notes vibration diagnostics for industrial. Differentiate between the various types of generating electric power stations. A 3 phase induction motor can be used for different applications with various speed and load requirements. Induction motor is an ac electric motor, having a stator and a rotor just like other motors, but the working principle is a little different which would be discussed further. The observant student will note the italicized and boldface material in this sentence. Other motors that are included are 1phase induction motors, permanent synchronous motors and synchronous reluctance motors. The induction motor is made up of the stator, or stationary windings, and the rotor. Basic electrical technology lecturer nptel videos description notes by prof. Power semiconductor drives notes pdf psd notes pdf book starts with the topics introduction to thyristor controlled drives, single phase semi and fully controlled converters connected to d.
Short question answers for 3 phase induction motor. For the same output a 1phase motor is about 30% larger than a corresponding 3phase motor. Analytic design evaluation of induction machines january 12, 2006 c 2005 james l. The rotor and stator are each connected from a different power supply, this gives another degree of freedom for controlling the motor over the shunt. Adjust the terminal voltage of the generator by changing the dc.
The rotor will constantly be turning to align its magnetic field with that of the stator field. There are two types of induction motors, one is named as single phase induction motor, while the second one is named as 3 phase induction motor. Course notes electric machines electrical engineering. Faradays law of induction may be stated as follows. Chapter 3 induction motor and different speed control methods page no 3. Pdf electromagnetism lecture notes university of cambridge. Induction machines notes from jane courtney operation the induction machine behaves like a transformer, transferring electrical energy from the stator to the rotor. The electromagnetism lecture notes is a book to provide an introduction to electromagnetism for electrical and electronics engineers.
This tutorial will introduce the user to the fundamental electrical and mechanical principles of ac electric induction motor design and application. A detailed analysis of various methods of starting an ac induction motor and their effects on motor characteristics pdf. It is logical that the least expensive, lowest maintenance type motor should be used most often. The 3phase set of currents, each of equal magnitude and with a phase. This torque is related to the motor output power and the rotor speed and out. The grainger electrical machinery laboratory is dedicated in memory of university of illinois alumnus w.
In the industrial sector alone, about 75% is consumed by motors and over 90% of them are induction machines. Starting of 3 phase induction motors, high starting. Speed control of induction motor using pwm technique. There are two basic reasons for the use of singlephase motors rather than 3phase motors. For reason of economy, most houses, offices and also rural areas are supplied with single phase a. Kulkarni department of electrical engineering, princeton university july 19, 2005 the problem the problem of induction is sometimes motivated via a comparison between rules of induction and rules of deduction. The single phase induction motor does not have a rotating magnetic field on the stator. The notes are organized in chapters, though the chapters may not correspond precisely with the order of the material as discussed in lecture. Massachusetts institute of technology department of electrical engineering and computer science 6. Lecture 10three phase induction motors electromechanical. Gopakumar, centre for electronics design and technology, iisc bangalore. Here you can download the free lecture notes of power semiconductor drives pdf notes psd pdf notes materials with multiple files links to download.
The rotor and stator windings are connected in parallel. Sep 27, 2016 induction motor is an ac electric motor, having a stator and a rotor just like other motors, but the working principle is a little different which would be discussed further. Winner of the standing ovation award for best powerpoint templates from presentations magazine. Based on the ev desired performances, the induction motor optimal power can be calculated. Understand the principle and the nature of single phase and 3 phase induction machines. Lecture 30 speed control of induction motor part 1 youtube.
Rotor currents are accessible at the brushes, where extra resistance can be inserted to modify the motor torquespeed characteristic. To study how to reverse the direction of rotation in 3 type of motor. Lecture notes electrical machine ii bee 1401 page 1. There are many types of ac motors, but this course focuses on threephase induction motors, the most common type of motor used in industrial applications.
It supplies an induction motor ich has a full load speed of 144wh 0 rpm. Four induction motors each supplying 120 kw at a power factor of 0,75 and an efficiency of 91 %. Pdf lecture 1 single phase induction motor sri vidhya. Ppt induction motor powerpoint presentation free to. Continuous torque is the torque a motor can produce continuously without exceeding the thermal limit of the winding insulation peak torque. Before discussing the methods to control the speed of three phase induction motor one should know the basic formulas of speed and torque of three phase induction. A three phase induction motor is basically a constant speed motor so its somewhat difficult to control its speed.
A 480v, 60 hz, 6pole, threephase, deltaconnected induction motor has the following parameters. Worlds best powerpoint templates crystalgraphics offers more powerpoint templates than anyone else in the world, with over 4 million to choose from. An emf voltage is induced in a conductor if it moves through a magnetic field. An induction motor also known as an asynchronous motor is a commonly used ac electric motor. Following data is taken from no load, locked rotor, and dc tests of a 3phase, wye connected 40 hp, 60 hz, 460 v, induction motor with a rated current of 57. View notes machine 2 notes from ee 141 at stanford university.
One synchronous motor of one mw operating at full load with an efficiency of 92 %. Three phase transformer winding the transformation of 3 current at one voltage to another can be done by means. This video lecture, part of the series basic electrical technology by prof. When frictional torque in a motor equals the morque from the lorentz force. An ac motor of this type may be part of a pump or fan or. These are compiled by david tong, department of applied mathematics and theoretical physics, university of cambridge. In his name, the grainger foundation funded the reconstruction of the electrical machinery laboratory in the department of electrical and computer engineering at the university of illinois. Extending binary properties to nary properties 12 8. Five induction motors each supplying 60 kw at a power factor of 0,8 and an efficiency of 93%. In general, the induction motor is cheaper and easier to maintain compared to other alternatives. If you have watched this lecture and know what it is about, particularly what electrical engineering topics are discussed, please help us by commenting on this video with your suggested description and title. Pdf basic electrical engineering 1st year ebook, notes.
Record all nameplate information for the induction motor. Gate, ese, psus lecture for electrical engineering. This pdf ebook notes on basic electrical engineering contains brief concise notes and will help you in your studies for your first year semester examination. Induction motor notes free download faadooengineers. They are generally simple to build and rugged, offer reasonable asynchronous. To study the different starting methods of of 3 type of motor.
Specific emphasis will be given to pump applications. Motor speed relationship the synchronous speed of an ac motor is the speed of the rotating magnetic field set up by the stator winding synchronous speed rpm 120 x frequency divided by the number of poles. In synchronousrotor construction it is common to use a combination of squiirrel cage and wound rotor. Umanand, principal research scientist, power electronics group, cedt, iisc bangalore for more detail.
In this project paper microcontroller based system to control speed of induction motor is developed using pulse width modulation technique 2. This specifies to which nema design class the motor belongs to. Speed control of three phase induction motor electrical4u. Induction motor gate,ese,psu lecture by eii youtube. Ac motors are used worldwide in many applications to transform electrical energy into mechanical energy. The basic idea of an electric motor is to generate two magnetic fields. Fall 2005 ee595s electric drive systems 2 overview of strategies voltsperhertz control constant slip control fieldoriented control. Several additional components are necessary to operate the singlephase motor.
This lecture will provide information on the following aspects. Introduction to induction motor the engineering projects. Here are the pdf lecture notes for the first year engineering subject basic electrical engineering. Which motor is preferred for use in mines where explosive gases exist. Adjust the machine speed with the turbine that drives the generator until the generator voltage frequency is nearly the same as the frequency of the network voltage. Identifying the vibration problems that can occur in induction motor drives have an added complexity due to the rotating magneticfields in the machine. The theory used in the work was collected by studying literature on how electrical motors work, and by simplifying the.
For most shore facility applications, this is the case. Single phase induction motor, theory of operation double. The induction motor cannot make a quickreversal run because of the torque acting in the opposite therefore stop the induction motor once, change the wire connections and make a reverse run construction characteristics coding system motor ac power supply mounting frame option d2 l a 4. For variable speed drives, the source is normally an inverter that uses power. Lecture 1 single phase induction motor 1introduction the singlephase induction machine is the most frequently used motor for refrigerators, washing machines, clocks, drills, compressors, pumps, and so forth. An electrical motor is a device that has brought about one of the biggest advancements in the fields of engineering and technology ever since the invention. The lighting distribution panels are the source for singlephase power supply. Target motor theory 4 3phase ac induction motor vector control motorola 3. Three phase induction motors three phase induction motor three phase induction motors are the most widely used motor in industry induction motor is used as generator especially in the wind energy applications single phase induction motors are commonly used for household appliance the operation of the induction motor is mainly based.
K devender reddy,assistant professor department of electrical and electronics engineering institute of aeronautical engineering autonomous dundigal, hyderabad 500 043. Lecture series on basic electrical technology by prof. Perform an analysis on induction machines which is the most rugged and the most. It deals with the detailed analysis of synchronous generators and motors which are the prime source of electrical power generation and its utilities. An induction motor can run at synchronous speed when a it is run on load b it is run in reverse direction c it is run on voltage higher than the rated voltage d e. Ppt threephase induction motor electrical engineering. Apr 04, 2008 lecture series on power electronics by prof. Fall 2005 ee595s electric drive systems 3 voltsperhertz control. There are also links to powerpoint slideshows that show the animations seen in the presentations. Clicking on the following links will allow you to down load adobe acrobat files of the class lecture notes.
Find the percentage slip and number of poles of the induction motor. The rotor turns at 1 725 rmin when operating at full load. Power semiconductor drives pdf notes psd pdf notes. At the end of the lecture, student should be able to. Scribd is the worlds largest social reading and publishing site. List and describe the more commonly used equipment in an electric substation. This application note discusses the basics of an ac induction motor. Umanand description about all chapters i consider this as lecture 2 meaning the first part the motivation as 1, the second part the course contents as 2 and the lecture 3 which will be of course the next hour. Induction motor theory jerry bednarczyk, pe course content introduction the ac induction motor is well suited to applications requiring constant speed operation. Electrical machines 3 notes em iii notes this subject is an extension of previous machines courses. Lecture notes institute of aeronautical engineering. Any mechanical load applied to the motor shaft will introduce a torque on the motor shaft. Theyll give your presentations a professional, memorable appearance the kind of sophisticated look that.
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