The rotor is separated from the stator by a small airgap which ranges from 0. Three phase induction motors mcqs with explanatory answers 1. The rotor will constantly be turning to align its magnetic field with that of the stator field. Construction, types and principle of operation of 3phase induction motors. As previously, we have covered a lot of important topics. It supplies an induction motor ich has a full load speed of 144wh 0 rpm. An induction motor, 3 phase induction motor or asynchronous motor is an ac electric motor in which the electric current in the rotor needed to produce torque is obtained by electromagnetic induction from the magnetic field of the stator winding. Today, i am gonna give you an introduction of a single phase induction motor. 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 3 phase set of currents, each of equal magnitude and with a phase. There are following methods of speed control of three phase induction motor. Here in this system a direct 3phase 50hz ac supply is at first transferred through zennon diode stabilized voltage drop setup to an or nand gate integrated logic circuit in. While we include numerous illustrations of two phase motors for simplicity, we must emphasize that nearly all polyphase motors are three phase. Ls and lr are stator and rotor leakage inductance per phase.
A threephase induction motor consists of mainly two parts. By induction motor, we mean that the stator windings induce a current flow in the rotor conductors, like a transformer, unlike a brushed dc commutator motor. There are two basic reasons for the use of single phase motors rather than 3 phase motors. Ppt induction motor powerpoint presentation free to. The stator carries a 3phase winding called stator winding while the rotor carries a short circuited winding called rotor winding. They run at a constant speed from noload to the full load. Thus from the working principle of three phase induction motor, it may be observed that the rotor speed should not reach the synchronous speed produced by the stator. The threephase induction motor is the extensively used for various kinds of industrial drives.
The three phase squirrelcage induction motor can, and many times does, have the same armature stator winding as the three phase synchronous motor. In three phase induction motor, the power is transferred from stator to rotor. Find the percentage slip and number of poles of the induction motor. Phase induction motors capacitorstart induction motor dynamic and steadystate performance of a. The software technologies used are visual basic 6 for form design and coding. Unit 3, 477 great south road penrose auckland new zealand tel. Mar 21, 2017 conventional 3phase windings made of insulated wire woundrotor similar to the winding on the stator aluminum bus bars shorted together at the ends by two aluminum rings, forming a squirrel. Pdf three phase squirrel cage induction motor, conctruction. Tesla polyphase induction motors ac motors electronics. Download 3 phase induction motor powerpoint presentation. If the frequency of 3 phase supply to the stator of 3 phase induction motor is increased, then. In an equivalent circuit per phase of an induction motor, as shown in figure 3. Assignment three phase induction motor iiteeeestudents.
Theory and analysis of three phase induction motor using. A threephase induction motor problem enginuity systems. Induction motors are by ac switchboard and it is a popular ac motor. Not only the threephase but single phase induction motor also consists of the main two parts. Construction of three phase induction motor electrical4u.
The construction of induction motor is very simple. Three phase induction motor 3d cad model library grabcad. Types, construction and principle of operation, 3 phase induction motor, general phasor diagram, equivalent circuit, power and torque relations, condition for maximum torque, circle diagram. 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. Threephase induction motor protection systems and its. Induction motor fault heading fault causes remedies induction motor a no supply voltage b driven equipment jam c motor shaft jammed. The singlephase motor stator has a laminated iron core with two windings arranged perpendicularly.
Similarly in this post, we will made a powerpoint file accessible for all. Mathematic model of threephase induction machine connected. Principle of working in a threephase induction motor, the stator is wound with a threephase winding for p number of poles. The three phase induction motor has following advantages. For industrial and mining applications, 3phase ac induction motors are the prime movers for the vast majority of machines. Now we discuss about the some different protection i. Three phase induction motor construction your electrical. The three phase induction motor or synchronous motor is used as ac drive. A 3phase induction motor is a machine which is constructed to work on the 3phase supply. Well it may also lead to fail permanently due to dry run of the motor. The very first thing that you should do before starting any type of maintenance on a motor is a visual inspection, a lot of times the trouble can be found just by looking, because if the problem is that bad then it should be very obvious by observation. Induction motors applications, control and fault diagnostics. Difference between single phase and three phase induction motor the single phase and three phase induction motor is differentiated on the various factors in this article such as the supply on which they operate, their starting torque, maintenance, features, the efficiency of the motor, their power factors and the example where the two motors are used.
Free energy generator using neodymium magnet activity. The main body of the stator consists of a number of laminations of cold rolled grain oriented silicon steel. Advantages of 3 phase induction motor generally easy to build and cheaper than corresponding dc or synchronous motors induction motor is robust. The stator carries a 3phase winding called stator winding while the rotor carries a shortcircuited winding called rotor winding only the stator winding is fed from the 3phase supply. Induction motors are maintenance free motors unlike dc motors and synchronous motors. Pdf construction of three phase linear induction motor.
Today we are going to made available a powerpoint presentation file for all. Single phase induction motor the engineering projects. Three phase induction motor explain the equivalent circuit and phasor diagram of three phase induction motor. These motors can be operated either directly from the mains or from adjustable variable frequency drives. The torque and speed characteristic is seriously affected when a 3phase motor operates on a single phase. The motor draws more current from remaining two supply lines. Three phase induction motor 3 phase induction motor pdf three phase induction motor diagram single phase induction motor pdf free download speed control of three phase induction motor with universal controller three phase induction motors 3 phase induction mltor the wound rotor induction motor speed control of induction motor induction motor problems and solutions pdf. Due to single phasing the induction motor performance severely effected. Construction of three phase linear induction motor. The starting torque of a 3 phase squirrel cage induction motor is a twice the full load torque b 1. Download cbse notes, neet notes, engineering notes, mba. Oct 05, 2016 that was all about the working of a 3 phase induction motor, so before telling the advantages i am going to give a brief idea on its equivalent electric circuit. Difference between single phase and three phase induction.
Basic construction of 3phase ac induction motors you. Free download induction motor seminar ppt, pdf report. The use of sixphase induction motor for industrial drives presents several advantages over the. Kanpur, india design of a three phase squirrel cage induction motor for electric propulsion system ravi prakash,mohammad junaidakhtar, r. Threephase or polyphase motors are of mainly two types. A 3 phase induction motor has two main parts i stator and ii rotor. Generally, it is known as the asynchronous motor because its running speed is less than its 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. Sep 02, 2014 a 3 phase slip ring motor has a double cage rotor 6 wound rotor c shortcircuited rotor d any of the above ans. As in the synchronous motor, applying three phase currents to the armature creates a synchronouslyrotating magnetic field. Hi friends, i hope you all are fine and doing great with your lives. Whenever we say induction machine we mean to say induction motor. Three phase induction motors are designed to meet high starting torque, good operating efficiency and power factor.
Volume 3, issue 1, july 20 353 abstract the paper presents a software development strategy for the design of three phase squirrel cage induction motors in windows programming platform. Record all nameplate information for the induction motor. Phase induction motors capacitorstart induction motor dynamic and steadystate performance of a capacitorstart singlephase induction motor split. In this case, power flows from the mechanical system, to the rotor circuit, then across the air gap to the stator circuit and external electrical system. Conclusion and future work protection of three phase induction motor from under voltage, single phasing, over current and phase reversal provide the smooth running of motor. The winding wound on the stator of three phase induction motor is also.
For reason of economy, most houses, offices and also rural areas are supplied with single phase a. Principle and the inverter schematics required to change speed induction motor are shown in figure 4. Speed torque characteristics of 3 phase induction motor duration. Lecture 6 three phase induction motors cairo university. Three phase armature winding is assembled in these holes. Hence such motors are known as a rotating transformer i.
Well, every electrical domain engineering students are aware of 3 phase. Like any electric motor, a 3phase induction motor has a stator and a rotor. Like any electric motor, a 3phase induction motor has a stator and rotor. Induction motor seminar ppt, pdf report study mafia. Parida department of electrical engineering national institute of technology, silchar,assam, india email. Home category electrical engineering mcq questions and answers 3 phase induction motors 1 the frequency of the induced emf in an induction motor is a. Optimization design of threephase induction motor is formulated as a nonlinear multivariable programming problem to meet the above requirements. Threephase induction motors authorstream presentation. Third international conference on advances in control and optimization of dynamical systems march 15, 2014. When we connect the primary winding, or the stator to a 3 phase ac. Construction of three phase induction motor about circuit.
Pdf this paper explores the construction process of a linear induction motor lim, the basic concepts behind key aspects of. Three phase induction motor construction your electrical guide. This represents the main winding of the machine and is to be connected to a 3 phase balanced supply. Maintenance and troubleshooting three phase induction motor. Feb 15, 2017 construction of 3 phase induction motor smile and learn. What is the three phase induction motor working principle. In the last decade, it has become increasingly common practice to use 3 phase squirrel cage ac induction motors with variable voltage variable frequency vvvf converters for variable speed drive vsd applications. We also discuss the construction of a three phase motor including its. Construction and working of 3 phase induction motor on ship.
List out the basic steps of drawing the circle diagram with any one example. A 3 phase induction motor can be used for different applications with various speed and load requirements. Threephase induction motors are designed to meet high starting torque, good operating efficiency and power factor. Optimization design of three phase induction motor is formulated as a nonlinear multivariable programming problem to meet the above requirements. Three phase induction motors authorstream presentation.
As i previously mentioned in my article on introduction to induction motors, there are two main types of induction motors, single phase induction motor and 3 phase induction motor. The basic idea of an electric motor is to generate two magnetic fields. This article concentrates only on a threephase induction. The slip ring three phase induction motor are started by inserting resistances so, the stator winding can be connected either in star or delta. Advantages and disadvantages of 3 phase induction motors. Isbn 9789535122074, pdf isbn 9789535163992, published 20151118. The three phase induction motor is the most widely used electrical motor. Induction machines are also called asynchronous machines i.
The rotor which is placed inside the stator is either squirrelcage type or. The rotor bars in squirrelcage induction motorsare not straight, but have some skew to reducenoise and harmonics. Three phase induction motor design in windows programming. Introduction types of electrical machines types of 3ph induction motor basic principle working principle compnents of induction motor application comparision between 1ph i. A 3phase, y connected, 460 volt line to line, 25 horsepower, 60 hz, 8 pole induction motor has the following constants, in ohms per phase referred to the stator.
It is not surprising to find that this type of electric motor is so popular, when one considers its simplicity, reliability and low cost. 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. Speed control of three phase induction motor electrical. Induction motors may be single phase or three phase. Three phase induction motors mcqs with explanatory answers. The squirrel cage motor is mostly started by stardelta stater and hence the stator of squirrel cage motor are delta connected. In a dc machine, the stator winding is excited by dccurrent and hence the field produced by thiswinding is time invariant in nature.
Figure 3 shows a trolley powered by a threephase induction motor manufactured by the company astra bus arad, romania radulescu et al. Induction motor basics, single phase and three phase induction. Discuss the procedure of noload and blocked rotor test with test setup arrangement. One single phase wattmeter plus miscellaneous apparatus as needed. Electrical freshers single phase induction motor job interview questions. Explain the unbalanced operation of the induction motor. A three phase, 12 pole, salient pole alternator is coupled to a diesel engine running at 500 rpm. Construction of squirrel cag induction motor it is the outer most part of the three phase is very simple, slip rings and brush assembly. Before troubleshooting the 3 phase induction motor, we must have to know about the 3 phase induction motor, star delta starter and its connection diagram. Slots are pressed out on the internal periphery of the stator laminations. The stator of the motor consists of overlapping winding offset by an electrical angle of 120o. Nov 27, 2019 the three phase induction motor is the most widely used electrical motor. Almost 80% of the mechanical power used by industries is provided by three phase induction motors because of its simple and rugged construction, low cost, good operating characteristics, the absence of commutator and good speed regulation. On this topic, i will explain in details about 3 phase induction motor construction before we talked about parts of the electric motor generally but on this topic, we will go deep for 3 phase induction motor construction only.
A read is counted each time someone views a publication summary such as the title, abstract, and list of authors, clicks on a figure, or views or downloads the fulltext. An induction motor can therefore be made without electrical connections to the rotor. Design of a three phase squirrel cage induction motor for. If the speeds become equal, there would be no such relative speed, so no emf induced in the rotor, and no current would be flowing, and therefore no torque would be generated. A three phase induction motor problem this application note describes how to set up, solve, and analyze the results of a twopole, three phase induction motor using rmxprt. A simple explanation of how a 3 phase induction motor works.
You should also make a dc measurement of stator winding linetoline resistance. Mostafa elshahed objectives learn a brief history of the electrical power systems construction. There are a lot of applications of 3 phase induction motor, to name a few 1. The major difference between them is that transformer is static in nature i. List and describe the more commonly used equipment in an electric substation. If a set of three phase current is added to these three coils. Differentiate between the various types of generating electric power stations.
Watch this video to understand the working principals of the three phase induction motors. Low cost, low maintenance, simple construction, reliability and high efficiency. The poles for which the winding is made could be 2, 4, 6, 8, etc. In this article, i am discussing about three phase induction motor construction.
The three phase induction motors are simple in construction, rugged, low cost and easy to maintain. Single phase induction motor the singlephase induction machine is the most frequently used motor for refrigerators, washing machines, clocks, drills, compressors, pumps, and so forth. Its working is depending on the principle of the revolving magnetic field. It is a simple 3 phase squirrel cage induction motor with 36 poles on stator and 21 poles on rotor. Ac induction motors are also the most common motors used in main powered home appliances.
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