A 3 phase induction motor can be used for different applications with various speed and load requirements. Induction motor 1 chapter 3 induction motor bee23 electrical machine power system 2 learning outcomes. 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. 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. You should also make a dc measurement of stator winding linetoline resistance. Three phase induction motor using written pole technology, main winding, exciter winding, control circuit for optimum utilization. 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. Threephase or polyphase motors are of mainly two types. Learn the principle of power factor improvement and evaluating the cost of electricity.
When a three phase supply is given to the three phase stator winding, a rotating magnetic field of constant magnitude is produced. The rotor will constantly be turning to align its magnetic field with that of the stator field. Single phase machines are restricted to small power levels. 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. An induction motor also known as an asynchronous motor is a commonly used ac electric motor.
Introduction an induction motor im is a type of asynchronous ac motor where power is supplied to the rotating device by means of electromagnetic. Ac induction motors are also the most common motors used in main powered home appliances. 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. Use the three phase induction motor with plc for any application. Two day national conference rteece2014 17th,18th january 2014 40 simulation of three phase electronic soft starter using four thyristors 1vishva pandya, 2vinod patel. Lecture 6 three phase induction motors cairo university. A small portion of each pole is covered with a shortcircuited, singleturn copper coil called the shading coil. This strange behavior of singlephase induction motor can be explained on the basis of doublefield revolving theory. This is a singlephase induction motor, with main winding in the stator.
List and describe the more commonly used equipment in an electric substation. A three phase supply is given to the stator of the induction motor. Record all nameplate information for the induction motor. The measurements was made on a small twophase motor designed for operation at rms phase currents of 0,3 a for different speeds. There are two basic reasons for the use of singlephase motors rather than 3phase motors. The induction motor acts like the transformer with the exception that its secondary windings are free to rotate.
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. Simulation of three phase electronic soft starter using. Three phase induction motors mcqs with explanatory answers 1. This is similar to a transformer, whose secondary is rotating and shortcircuited. Information in this document is subject to change without notice and does not. Theory and analysis of three phase induction motor using. Low and high voltage three phase induction motors m line squirrel cage rotor horizontal date.
One of the most important topic for electrical engineers. 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. They run at a constant speed from noload to the full load. In this module we will be discussing the three phase induction machine.
Free download induction motor seminar ppt, pdf report. Hi all, so im working on a project titled controlling the speed of a single phase induction motor. It is widely used when compared to the three phase motor for. Induction motor seminar ppt, pdf report study mafia. The threephase induction motor is the extensively used for various. Perform an analysis on induction machines which is the most rugged and the most. Parameter estimation of three phase induction motor. Mostafa elshahed objectives learn a brief history of the electrical power systems construction. Generally, it is known as the asynchronous motor because its running speed is less than its synchronous speed. The operating principle of a 3 phase induction motor is based on the production of r. Like any electric motor, a 3phase induction motor has a stator and rotor. As the name indicates stator is a stationary part of induction motor. Specifically, the squirrel cage design is the most extensively used electric motor in industrial applications. Simulation of three phase electronic soft starter using four thyristors issn.
Understand the principle and the nature of single phase and 3 phase induction machines. Induction machines guru nanak dev engineering college. Unit 4 three phase induction motor rajkumar kuppapillai. Induction motors an induction motor has two magnetically coupled circuits. Like any other electrical motor, induction motors have two main parts the rotor and the stator. An induction motor is also called asynchronous motor as it runs at a speed other than the synchronous speed. Introduction types of electrical machines types of 3 ph induction motor basic principle working principle compnents of induction motor application comparision between 1ph i.
Well, every electrical domain engineering students are aware of 3 phase induction motor. 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. 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. The 3 phase set of currents, each of equal magnitude and with a phase. Three phase induction motor works under the principle of electromagnetic induction. 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. 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 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. Threephase induction motor protection systems and its.
Download 3 phase induction motor powerpoint presentation. One single phase wattmeter plus miscellaneous apparatus as needed. 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. At the end of the lecture, student should be able to. Three phase induction motor electromagnetic induction. 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. Starting method for induction motors a 3 phase induction motor is theoretically self starting. Threephase induction motors are run at a constant speed from no. Starting of an induction motor a three phase induction motor is self starting. A threephase induction motor problem enginuity systems. The rotor winding derives its voltage and power from the externally. The fact that the shadedpole motor is singlewinding no auxiliary winding selfstarting one, makes it less costly and results in rugged construction.
There are two types of rotors which are employed in 3 phase induction motor. Advantages of 3 phase induction motor generally easy to build and cheaper than corresponding dc or synchronous motors induction motor is robust. 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. One singlephase wattmeter plus miscellaneous apparatus as needed.
Experiment 3 application on three phase induction motor. At the time of starting, the motor slip is unity, and the starting current is very large. Ppt induction motor powerpoint presentation free to. Presentation on 3 phase motor electromagnetic induction. The basic idea of an electric motor is to generate two magnetic fields. The starting winding is located 90 degree electrical from the main winding. Principle of operation a rotating magnetic field rmf is set up in the stator when. Three coils are placed on the stator of squirrelcage threephase induction motor which they have phase difference with each other 120 degrees. This document is highly rated by electrical engineering ee students and has been viewed 787 times. This field produces an emf in the rotor winding by mutual induction principle, which in turn circulates current when the rotor is short circuited. The three phases of the rotor windings are usually yconnected, the end of the three rotor.
A poly phase induction motor consists of two major parts, the stator and rotor. In a three phase induction motor, the induced emf in the rotor circuit. Differentiate between the various types of generating electric power stations. This document was uploaded by user and they confirmed that they have the permission to share it. Types, construction and principle of operation, 3 phase induction motor, general. Three phase induction motors used in explosive atmospheres w60 line squirrel. This application note also covers the basics of induction motors and different types of induction motors. This main winding operates during the brief period when the motor starts up. Three phase induction motors mcqs with explanatory answers. 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. 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. What is the three phase induction motor working principle. An843, speed control of 3phase induction motor using. Turn on and reverse the direction of induction motor.
This presentation file is prepared by one of my friend taking help from different sources. Chapter 3 phase induction motor drives, ppt, electrical. 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. The stator of an induction motor consists of 3 phase windings, which when connected to a 3 phase supply creates a rotating magnetic field. The major difference between them is that transformer is static in nature i. This rotating magnetic field produces an effect of rotating poles around a rotor. If the frequency of 3phase supply to the stator of 3phase induction motor is increased, then.
In an induction motor the conventional 3phase winding sets up the rotating magnetic field fs and the rotor carries the current carrying conductors. 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. The three phase induction motors are simple in construction, rugged, low cost and easy to maintain. 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. The single phase induction motor comes with the different starting arrangements. The rotor of an induction motor can be a squirrel cage rotor or wound type rotor. For reason of economy, most houses, offices and also rural areas are supplied with single phase a. The three phase induction motor is the extensively used for various kinds of industrial drives. 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. Presentation on 3 phase motor electromagnetic induction machines. This article concentrates only on a threephase induction motor and its protection.
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