Induction motor theory jerry bednarczyk, pe course content introduction the ac induction motor is well suited to applications requiring constant speed operation. Introduction to induction motor instrumentation and control. Record all nameplate information for the induction motor. Notes for electrical machine 2 em2 by deepak kumar sahoo lecture notes, notes, pdf free download, engineering notes, university notes, best pdf notes, semester, sem, year, for all, study material. The threephase induction motor is the extensively used for various kinds of industrial drives. Conduct locked rotor tests on 3phase induction motors conduct noload tests on 3phase induction motors. Types, construction and principle of operation, 3 phase induction motor, general. If you need a powerpoint viewer follow this link to the microsoft download site. For reason of economy, most houses, offices and also rural areas are supplied with single phase a. Introduction this application note describes the design of a 3phase ac induction motor drive with volts per hertz control in closedloop vhz cl. There are also links to powerpoint slideshows that show the animations seen in the presentations.
This lecture will provide information on the following aspects. There are two types of induction motors, one with wound type rotor, also called slipring motor and another one with squirrelcage rotor. At the end of the lecture, student should be able to. There are two basic reasons for the use of singlephase motors rather than 3phase motors.
The basic idea of an electric motor is to generate two magnetic fields. It is based on freescales 56f800e microcontrollers. An induction motor always operates at a speed lower than the synchronous speed because the rotating magnetic field that occurs in the stator will generate flux in the rotor that will cause the rotor to rotate, but due to the delay of the flow current in the rotor with current flow in the stator, the rotor will never reach its rotating magnetic field speed, that is, the synchronous speed. Simplified steadystateequivalent circuit of induction motor. So, now principle of induction motor right so, the operation of three phase. 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. These are compiled by david tong, department of applied mathematics and theoretical physics, university of cambridge. This final thesis will mostly be dedicated to induction motors but also to synchronous permanent magnet and reluctance motors. When frictional torque in a motor equals the morque from the lorentz force inside the motor, the net torque is zero and a steady operation is achieved. The maximum torque that the motor can develop typically 2. The three phase induction motors are simple in construction, rugged, low cost and easy to maintain. What is common to all the members of this family is that the basic physical process involved in their operation is the conversion of electromagnetic energy to mechanical energy, and vice versa. Lecture series on basic electrical technology by prof. The 3phase set of currents, each of equal magnitude and with a phase.
The rotor will constantly be turning to align its magnetic field with that of the stator field. You should also make a dc measurement of stator winding linetoline resistance using a dmm. Perform an analysis on induction machines which is the most rugged and the most. The various losses that occur in an induction motor are. Since the induction generator is actually an induction motor being driven by a prime mover, it has severai advantages. Syllabus of bachelor of technology in electrical engineering 4th semester electrical machinesii. An induction motor also known as an asynchronous motor is a commonly used ac electric motor. Moduleiv 10 hours single phase induction motor, theory of operation double revolving field theory, equivalent circuit, determination of parameters methods of starting, split phase starting, repulsion starting, shaded pole starting, performance characteristics. Clicking on the following links will allow you to down load adobe acrobat files of the class lecture notes.
Notes for electrical machine 2 em2 by deepak kumar sahoo lecture notes, notes, pdf free download, engineering notes, university notes, best pdf. 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. The stator separate from rotor by small air gap have ranges from 0. List and describe the more commonly used equipment in an electric substation. They are generally more expensive than induction motor dri ves,but the advantages is that the efficiency is higher,which is tends to lower the life cycle cost. An843, speed control of 3phase induction motor using pic18 mcus.
Starting of 3 phase induction motors, high starting. Advantages of 3 phase induction motor generally easy to build and cheaper than corresponding dc or synchronous motors induction motor is robust. Umanand, principal research scientist, power electronics group, cedt, iisc bangalore for more detail. Lecture notes electrical machine ii bee 1401 page 1. The induction motor is made up of the stator, or stationary windings, and the rotor. An887, ac induction motor fundamentals microchip technology. Induction motor 1 chapter 3 induction motor bee23 electrical machine power system 2 learning outcomes. Notes for electrical machine 1 em1 by verified writer lecture notes, notes, pdf free download, engineering notes, university notes, best pdf notes, semester, sem, year, for all, study material. Ud dwivedi introduction threephase induction motors are the most. Extending binary properties to nary properties 12 8. If the induction motor is operating in the linear magnetic region, the lm is constant. This mode of operation can be used to quickly stop a machine. To study how to reverse the direction of rotation in 3 type of motor. A 3 phase induction motor can be used for different applications with various speed and load requirements.
Lecture notes institute of aeronautical engineering. Uses soft magnet rotor that is magnetized by the application of current in the stator coils 3. Induction motors induction motors are the most commonly used prime. Apr 02, 2008 lecture series on basic electrical technology by prof. To study the different starting methods of of 3 type of motor. A threephase ac induction motor is the only type where the rotating magnetic field is created naturally in the stator because of the nature of the supply. The ac induction motor is the most used electrical motor in industrial applications worldwide.
Em2 by deepak kumar sahoo engineering notes handwritten. By far the most commonly used ac motor is the induction motor. Elements of electrical machines lecture notes for students on photo. Induction machines 1 introduction the induction machine was invented by nikola tesla in 1888.
Rpm as a motor will deliver full rated power as a generator at 3650 rpm if the hajfload motor speed is 3570 rpm, the output as a generator will be onehalf of rated value when driven at 3630 rpm, etc. Fall 2005 ee595s electric drive systems 2 overview of strategies voltsperhertz control constant slip control fieldoriented control. Ac induction motors are also the most common motors used in main powered home appliances. Understand the principle and the nature of single phase and 3 phase induction machines. In this application note, we will generate a third pwm in software, using a general purpose timer and an io pin resource that are readily available on the picmicro microcontroller.
Single phase induction motor, theory of operation double. Feb, 2019 hi all, let us begin the course on induction motors, in this video, we will have an introduction and basic construction concepts. Fall 2005 ee595s electric drive systems 36 the plan continued achieving 14. The induction machine behaves like a transformer, transferring electrical energy from the stator to the rotor. Synchronous and asynchronous electromechanicalsystems dr. The rotor has salient poles and a cage so that it starts like an induction motor, and runs like a synchronous motor. It is available from fractional horsepower ratings to megawatt levels. Notes for electrical machine 1 em1 by verified writer. Then, equation 1 can be shown in terms of magnitude as.
Elements of electrical machines lecture notes for students. Why is an induction motor called a rotating transformer. Hi all, let us begin the course on induction motors, in this video, we will have an introduction and basic construction concepts. Right from its inception its ease of manufacture and its robustness have made it a very strong candidate for electromechanical energy conversion. Differentiate between the various types of generating electric power stations.
Three phase induction motor introduction the induction machine was invented by nikola tesla in 1888. The electric energy generated purchased by consumers for different needs. Fall 2005 ee595s electric drive systems 3 voltsperhertz control. The electromagnetism lecture notes is a book to provide an introduction to electromagnetism for electrical and electronics engineers. In general, the induction motor is cheaper and easier to maintain compared to other alternatives.
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. Lecture notes on induction motor facts about im about 65% of the electric energy in the united. In a dc motor, the electric power is conducted directly to the armature through brushes and commutator. Other motors that are included are 1phase induction motors, permanent synchronous motors and synchronous reluctance motors. Woundrotor induction motors are more expensive they require much more maintenance because of the.
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