Turn on and reverse the direction of induction motor. Apr 01, 2020 chapter 3 phase induction motor drives, ppt, electrical machines, semester, engineering electrical engineering ee notes edurev is made by best teachers of electrical engineering ee. Like any other electrical motor, induction motors have two main parts the rotor and the stator. The model created by rmxprt will then be used as an input for empulse as a basis for performing more detailed analysis and for increasing the accuracy of the performance pre. The fact that the shadedpole motor is singlewinding no auxiliary winding selfstarting one, makes it less costly and results in rugged construction. The measurements was made on a small twophase motor designed for operation at rms phase currents of 0,3 a for different speeds. Single phase induction motor double revolving field theory the threephase induction motor starting torque inversely depends on the slip this implies that a small positive slip 0. Threephase or polyphase motors are of mainly two types. One single phase wattmeter plus miscellaneous apparatus as needed. Threephase induction motor protection systems and its. Three phase induction motors used in explosive atmospheres w60 line squirrel.
The major difference between them is that transformer is static in nature i. Free download induction motor seminar ppt, pdf report. This application note also covers the basics of induction motors and different types of induction motors. This rotating magnetic field produces an effect of rotating poles around a rotor. Information in this document is subject to change without notice and does not. The stator of a split phase induction motor is provided with an auxiliary or starting winding s in addition to the main or running winding m. Threephase induction motors are run at a constant speed from no. A poly phase induction motor consists of two major parts, the stator and rotor. Three coils are placed on the stator of squirrelcage threephase induction motor which they have phase difference with each other 120 degrees. Three phase induction motors mcqs with explanatory answers. This presentation file is prepared by one of my friend taking help from different sources.
Like any electric motor, a 3phase induction motor has a stator and rotor. A 3 phase induction motor can be used for different applications with various speed and load requirements. There are two basic reasons for the use of singlephase motors rather than 3phase motors. In an induction motor the conventional 3phase winding sets up the rotating magnetic field fs and the rotor carries the current carrying conductors. Two day national conference rteece2014 17th,18th january 2014 40 simulation of three phase electronic soft starter using four thyristors 1vishva pandya, 2vinod patel. When the supply is connected to the stator of a threephase induction motor, a rotating magnetic field is produced, and the rotor starts rotating and the induction motor starts. Ppt induction motor powerpoint presentation free to. A small portion of each pole is covered with a shortcircuited, singleturn copper coil called the shading coil. Advantages of 3 phase induction motor generally easy to build and cheaper than corresponding dc or synchronous motors induction motor is robust. As the name indicates stator is a stationary part of induction motor. The starting winding is located 90 degree electrical from the main winding. Learn the principle of power factor improvement and evaluating the cost of electricity.
The single phase induction motor comes with the different starting arrangements. Introduction an induction motor im is a type of asynchronous ac motor where power is supplied to the rotating device by means of electromagnetic. You should also make a dc measurement of stator winding linetoline resistance. The rotor of an induction motor can be a squirrel cage rotor or wound type rotor. Chapter 3 phase induction motor drives, ppt, electrical. Use the three phase induction motor with plc for any application. At the end of the lecture, student should be able to. A threephase induction motor problem this application note describes how to set up, solve, and analyze the results of a twopole, threephase induction motor using rmxprt. Presentation on 3 phase motor electromagnetic induction. Starting of an induction motor a three phase induction motor is self starting. This strange behavior of singlephase induction motor can be explained on the basis of doublefield revolving theory. Introduction induction motors are employed in textile mills, agriculture and almost all the manufacturing industries to drive the loads because of its rugged construction and ease operation. This is similar to a transformer, whose secondary is rotating and shortcircuited.
Types, construction and principle of operation, 3 phase induction motor, general. When a three phase supply is given to the three phase stator winding, a rotating magnetic field of constant magnitude is produced. An induction motor also known as an asynchronous motor is a commonly used ac electric motor. In an induction motor, the electric current in the rotor needed to produce torque is obtained via electromagnetic induction from the rotating magnetic field of the stator winding. The threephase induction motor is the extensively used for various. Induction motors an induction motor has two magnetically coupled circuits. Differentiate between the various types of generating electric power stations. A 3 phase induction motor derives its name from the fact that the rotor current is induced by the magnetic field, instead of electrical connections. At the time of starting, the motor slip is unity, and the starting current is very large. They run at a constant speed from noload to the full load. Parameter estimation of three phase induction motor.
This article concentrates only on a threephase induction motor and its protection. List and describe the more commonly used equipment in an electric substation. Synchronous motors are special types of motors used in constant speed applications, whereas most of the motors used in the industrial applications are of induction type. Mostafa elshahed objectives learn a brief history of the electrical power systems construction. Hi all, so im working on a project titled controlling the speed of a single phase induction motor. Presentation on 3 phase motor electromagnetic induction machines. One singlephase wattmeter plus miscellaneous apparatus as needed. Perform an analysis on induction machines which is the most rugged and the most.
The basic idea of an electric motor is to generate two magnetic fields. If the frequency of 3phase supply to the stator of 3phase induction motor is increased, then. The operating principle of a 3 phase induction motor is based on the production of r. Low and high voltage three phase induction motors m line squirrel cage rotor horizontal date. Simulation of three phase electronic soft starter using.
The 3 phase set of currents, each of equal magnitude and with a phase. While researching on the internet i came across this one circuit that proposes a model that uses a microcontroller and a triac circuit and a. The stator of an induction motor consists of 3 phase windings, which when connected to a 3 phase supply creates a rotating magnetic field. An induction motor is also called asynchronous motor as it runs at a speed other than the synchronous speed. Three phase induction motor works under the principle of electromagnetic induction. It is very important that this brace be reinstalled exactly as it was originally, before the motor is moved from storage or any time when the motor is being transported. Introduction types of electrical machines types of 3 ph induction motor basic principle working principle compnents of induction motor application comparision between 1ph i. Lecture 6 three phase induction motors cairo university. The 3phase alternating current ac induction motors are mechanically simple, rugged, highly reliable, lower in cost per horsepower than dc motors and capable of more torque and efficiency than singlephase ac motors. This document is highly rated by electrical engineering ee students and has been viewed 787 times. Theory and analysis of three phase induction motor using. This is a singlephase induction motor, with main winding in the stator. Three phase induction motor electromagnetic induction.
The phase currents waveforms of the twophase induction motor ac current control in steadystate were by measuring on the real motor checked. The three phase induction motors are simple in construction, rugged, low cost and easy to maintain. Ac induction motors are also the most common motors used in main powered home appliances. Double field revolving theory ac current flows through the stator two fields are generated 1f forward rotating field 2bbackward rotating field pulsating field due to various magnitudes of field at diff time 2 3. The threephase induction motor is also called an asynchronous motor and it is the most commonly used type of motor in industrial applications. The three phases of the rotor windings are usually yconnected, the end of the three rotor. If a set of threephase current is added to these three coils, rotating field is created in air gap which rotates with suitable speed with frequency of the applied current. Three phase induction motor using written pole technology, main winding, exciter winding, control circuit for optimum utilization.
In this module we will be discussing the three phase induction machine. One of the most important topic for electrical engineers. A threephase induction motor problem enginuity systems. The induction motor acts like the transformer with the exception that its secondary windings are free to rotate. Induction motor 1 chapter 3 induction motor bee23 electrical machine power system 2 learning outcomes. For reason of economy, most houses, offices and also rural areas are supplied with single phase a. Experiment 3 application on three phase induction motor. 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. This document was uploaded by user and they confirmed that they have the permission to share it.
Induction motor seminar ppt, pdf report study mafia. This field produces an emf in the rotor winding by mutual induction principle, which in turn circulates current when the rotor is short circuited. Simulation of three phase electronic soft starter using four thyristors issn. Download 3 phase induction motor powerpoint presentation. The rotor will constantly be turning to align its magnetic field with that of the stator field. The rotor winding derives its voltage and power from the externally. An843, speed control of 3phase induction motor using.
Search wegthreephaseinductionmotorsmasterline50019089brochureenglish. A wide variety of 3 phase ac induction motor options are available to you, there are 1,918 suppliers who sells 3 phase ac induction motor on, mainly located in asia. Principle of operation a rotating magnetic field rmf is set up in the stator when. Unit 4 three phase induction motor rajkumar kuppapillai. In a three phase induction motor, the induced emf in the rotor circuit. Methods of starting three phase induction motors as we know, once a supply is connected to a three phase induction motor a rotating magnetic field will be set up in the stator, this will link and cut the rotor bars which in turn will induce rotor currents and create a rotor field which will interact with the stator field and produce rotation. Generally, it is known as the asynchronous motor because its running speed is less than its synchronous speed. Three phase induction motors mcqs with explanatory answers 1. There are two types of rotors which are employed in 3 phase induction motor. The top countries of suppliers are india, china, and taiwan, china, from which the percentage of 3 phase ac induction motor supply is 1%, 98%, and 1% respectively.
The three phase induction motor is the extensively used for various kinds of industrial drives. An induction motor can be defined as the ac electric motor device in which a power source fed by the alternating current with the help of a primary winding. This main winding operates during the brief period when the motor starts up. It is widely used when compared to the three phase motor for. A three phase supply is given to the stator of the induction motor.
What is the three phase induction motor working principle. Induction machines guru nanak dev engineering college. Starting method for induction motors a 3 phase induction motor is theoretically self starting. Contents 1introduction 2 history 3 principle of operation 4 starting of motor 5 speed control 6 types of 3 phase induction motors 7 construction 8 production of rotating magnetic field.
683 1098 1208 481 278 1008 483 901 128 269 767 501 343 1026 185 1053 638 751 889 1260 1548 888 108 193 196 981 197 1423 198 132 419 329 803 926 65 1551 258 632 1097 83 1257 580 1407 1328 685 1210 296 310