Three phase induction motors authorstream presentation. Design and analysis of three phase induction motor using computer program. Unit 16 electric motors washington state university. Maintenance and troubleshooting three phase induction motor. Third international conference on advances in control and optimization of dynamical systems march 15, 2014.
A free powerpoint ppt presentation displayed as a flash slide show on id. The major difference between them is that transformer is static in nature i. Applications of three phase induction motors of size varying from half a kilowatt to thousands of kilowatts are numerous. Three phase induction motor electromagnetic induction. Parida department of electrical engineering national institute of technology, silchar,assam, india email. Theory and analysis of three phase induction motor using. 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. The three phase induction motor is the easiest motor of this type to understand so these notes start with that type. It is widely used when compared to the three phase motor for. Whenever the motor temperature is equal to and below.
The main purpose of controlling the speed of three phase induction motor is to save unwanted energy. The three phase induction motors are simple in construction, rugged, low cost and easy to maintain. If so, share your ppt presentation slides online with. 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 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 single phase ac motors. While this is not a severe problem for small motors. A small portion of each pole is covered with a shortcircuited, singleturn copper coil called the shading coil. Induction motors an induction motor has two magnetically coupled circuits.
Mostafa elshahed objectives learn a brief history of the electrical power systems construction. Free download induction motor seminar ppt, pdf report. Record all nameplate information for the induction motor. Three phase or poly phase motors are of mainly two types. Presentation on 3 phase motor free download as powerpoint. In a three phase induction motor, the induced emf in the rotor circuit depends. What are the advantages of a three 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.
Induction motors play a very important role in both worlds, because of low cost, reliable operation, robust operation and low maintenance. Ppt induction motor powerpoint presentation free to. Compare the rotation of this motor with that in figure 164. This induces an electric field in a coil or squirrel cage to drive a rotor. What is active, reactive and apparent power definition. Electric power single and three phase power active. One of the ways of creating a rotating electromagnet is to connect a threephase power source to a stator made of three electromagnets a, b, and c, that are placed at 120 to one another as shown in figure 3. A three phase induction motor runs on a three phase ac supply.
Learn what a three phase induction motor is, how it is constructed, and its working principle. Simulation of three phase electronic soft starter using four thyristors. Eee page 6 where f is the supply frequency and p is the no. The principle of operation of a three phase induction motor using written pole technology depends on one set of. When a three phase induction motor connected to a single phase power supply using the steinmetz connection operates in a practical noload condition, not all windings consume active power. Large three phase motors are more efficient than smaller 3 phase motors, and most all single phase motors. Differentiate between the various types of generating electric power stations. 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. With regard to the currents, the space vector can be defined as follows. This article concentrates only on three phase induction motor and its protection.
How an induction motor works by equations and physics. Today we are going to made available a powerpoint presentation file for all. List and describe the more commonly used equipment in an electric substation. This application note also covers the basics of induction motors and different types of induction motors. Starting method for induction motors a 3 phase induction motor is theoretically self starting. Single phase induction motor the single phase induction machine is the most frequently used motor for refrigerators, washing machines, clocks, drills, compressors, pumps, and so forth. As mentioned above that, due to the rotating magnetic field of the stator, the induction motor becomes self starting. 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. Here we will see a detailed article related to the starting methods of three phase induction motor. Understand the principle and the nature of single phase and 3 phase induction machines. Tesla polyphase induction motors ac motors electronics. Single phase machines are restricted to small power levels.
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 motor seminar ppt, pdf report study mafia. Search wegthreephaseinductionmotorsmasterline50019089. Induction motor works on the principle of electromagnetic induction. This limits the starting current to the induction motor by using thyristors. This soft start of induction motor is the modern method of starting that reduces the mechanical and electrical stresses caused in the dol and star delta starters. The sinusoidal stator phase currents fed in the stator coils create a magnetic field. Applications of three phase induction motor are for fixedspeed. Presentation on 3 phase motor electromagnetic induction machines. Presentation on 3 phase motor free download as powerpoint presentation. Mechanical energy is needed in the daily life use as well as in the industry. Kanpur, india design of a three phase squirrel cage induction motor for electric propulsion system ravi prakash,mohammad junaidakhtar, r. Introduction types of electrical machines types of 3 ph induction motor basic principle working principle compnents of induction motor application comparision between 1ph i. You should also make a dc measurement of stator winding linetoline resistance.
Speed control of three phase induction motor ppt play ppt. Ppt threephase induction motor electrical engineering. Three phase induction motors used in explosive atmospheres w60 line squirrel cage rotor horizontal date. One single phase wattmeter plus miscellaneous apparatus as needed. The single phase induction motor comes with the different starting arrangements. Types of single phase induction motors electronics hub. The same field is utilized by one of the stator windings to work as an induction motor to meet mechanical load while, a three phase emf is induced in the other two sets of windings. Perform an analysis on induction machines which is the most rugged and the most. Design of a three phase squirrel cage induction motor for. These types of motors are known as selfstarting induction motors.
Induction motor is the property of its rightful owner. If a three phase motor is running when the single phase condition occurs, it will attempt to deliver its full horsepower, enough to drive. Search wegthreephaseinductionmotorstlinesquirrelcage. Presentation on 3 phase motor electromagnetic induction. Control of two phase induction motor using a conventional three phase bridge inverter abstract. Scribd is the worlds largest social reading and publishing site. The basic idea of an electric motor is to generate two magnetic fields. To get a good understanding of the working principle of a three phase. Like any electric motor, a 3 phase induction motor has a stator and a rotor. Search wegthreephaseinductionmotorsmasterline50019089brochureenglish.
Three phase induction motor free download as powerpoint presentation. It is the actual outcomes of the electrical system which runs the electric circuits or load. Learn the principle of power factor improvement and evaluating the cost of electricity. As previously, we have covered a lot of important topics. The single phase motor stator has a laminated iron core with two windings arranged perpendicularly. This strange behavior of single phase induction motor can be explained on the basis of doublefield revolving theory. Turn on and reverse the direction of induction motor. Three phase induction motor or ac motor is started by itself but we require some starter or other methods for proper starting and controlling induction motor. Induction motor fault heading fault causes remedies induction motor a no supply voltage b driven equipment jam c motor shaft jammed. Learn how to troubleshoot 3 phase induction motor step by step with circuit diagram, figure and important points about induction motor star delta connection. 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 most common type of ac motor being used throughout the work today is the induction motor. Download 3 phase induction motor powerpoint presentation. In this motor depends on that one set of winding is connected to a three phase supply and revolving magnetic field is developed in the air gap.
The fact that the shadedpole motor is singlewinding no auxiliary winding selfstarting one, makes it less costly and results in rugged construction. Threephase induction motor protection systems and its. It certainly leads to the best performance and high efficiency of the induction motor. The bars forming the conductors along the rotor axis are connected by a thick metal ring at the ends, resulting in a short circuit. Ppt single phase induction powerpoint presentation free. The magnetic field in the air gap from the voltage applied to the stator. Power factor and efficiency, both are greater in case of three phase system.
Pdf mathematical modelling of an 3 phase induction motor. The threephase induction motor is the extensively used for various. At the end of the lecture, student should be able to. 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. 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. Introduction types of electrical machines types of 3ph induction motor basic principle working principle compnents of induction motor application comparision between 1ph i. Apr 15, 2020 ppt three phase induction motor electrical engineering ee notes edurev is made by best teachers of electrical engineering ee. Three phase squirrel cage induction motors are widely used in industrial drives because they are rugged, reliable and economical.
This is similar to a transformer, whose secondary is rotating and shortcircuited. This document is highly rated by electrical engineering ee students and has been viewed 2482 times. Simulation of three phase electronic soft starter using four. Threephase induction motors are the most common and. Electric power single and three phase power active reactive apparent. Consequently, a defect can induce high losses in terms of cost and can be dangerous in terms of security and safety.
Experiment 3 application on three phase induction motor. This paper describes the control of two phase induction motor using a conventional three phase bridge inverter. Pdf design and analysis of three phase induction motor. Reduced voltage starters are used on all types of dc and ac motors. What is active, reactive, apparent and complex power. Use the three phase induction motor with plc for any application. 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. Find powerpoint presentations and slides using the power of, find free presentations research about three phase induction motor ppt. Efficiency for a lightly loaded or noloaded induction motor is poor because most of the current is involved with maintaining the magnetizing flux.
Induction motors introduction three phase induction motors are the most common and frequently encountered machines in industry simple design, rugged, lowprice, easy maintenance wide range of power ratings. A variable frequency drive vfd is used to control the speed of motor with the primary voltage control method. Generally, it is known as the asynchronous motor because its running speed is less than its synchronous speed. Two phase induction motors in comparison with conventional three phase motors have the advantage of a simple stator current vector control.
Single phase induction motors are used primarily for domestic and lightindustrial applications where three phase supply is generally not available. For reason of economy, most houses, offices and also rural areas are supplied with single phase a. Pdf induction motors have been the workhorse of industry since decades. An843, speed control of 3phase induction motor using pic18 mcus. Thus, as an electrical and electronics engineer or hobbyist we must know a few basic concepts about these types of machines we use regularly in our life. The power which is actually consumed or utilised in an ac circuit is called true power or active power or real power. A 3 phase ac induction motor can be controlled by varying its inputs according to a. Squirrel cage induction motors draw 500% to over % of full load current flc during starting. The three phase induction motor with written pole technology consists of two three phase stator windings and the ferrite layer on the rotor periphery.
A 3 phase induction motor can be used for different applications with various speed and load requirements. The 3 phase set of currents, each of equal magnitude and with a phase. The stator of an induction motor consists of 3 phase windings, which when connected to a 3 phase supply creates a rotating magnetic field. Explain starting methods of 3 phase induction motor. View and download powerpoint presentations on three phase induction motor ppt. The speed of rotating magnetic field is synchronous speed, n s r. Induction motor 1 chapter 3 induction motor bee23 electrical machine power system 2 learning outcomes.
Working principle of 3 phase induction motor is explained and from this, why induction motor is self starting, why rotor rotates in same direction as the rotating field are also answered. The stator carries a 3 phase winding called stator winding while the rotor carries a shortcircuited winding called rotor winding only the stator winding is fed from the 3 phase supply. When three phase supply is given to the stator winding, a rotating magnetic field of constant magnetic field is produced. The difference in speed between rotor, the synchronous speed and the rotating. Large induction motor efficiency can be as high as 95% at full load, though 90% is more common. Assuming that i a, i b, i c are the instantaneous currents in the. So, this document provides information about single phase induction motor, constructionstator, rotor, working principle, types of single phase induction motors, starting methods of single phase induction motors, and applications of single. The rotor will constantly be turning to align its magnetic field with that of the stator field. Single phase induction motors are used extensively for smaller loads, such as household appliances like fans. Performance of three phase induction motor the speed of the rotating field synchronous speed is slip speed is slip, s is is the rotor speed. Threephase induction motor ppt download slideplayer. There is an important relationship between active and reactive power and the post below will help to understand that why active power p is called true power and reactive power q is called imaginary power. Start induction motor dynamic and steadystate performance of a.
This is a single phase induction motor, with main winding in the stator. Threephase induction motors are the most common and frequently encountered machines in industry it can be. Three phase and six phase induction motor electromagnetic. 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. So, now principle of induction motor right so, the operation of three phase induction. The three phase induction motor is the extensively used for various kinds of industrial drives. A 3 phase induction motor uses current delivered in three phases in a sequence into the coils of a stator to create a rotating magnetic field. 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. The single phase induction motor is more subtle and less efficient.
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