Start induction motor dynamic and steadystate performance of a. As in the synchronous motor, applying three phase currents to the armature creates a synchronouslyrotating magnetic field. To obtain the variation of no load power and current and blocked rotor power and current with changes in the applied voltage to the stator. One single phase wattmeter plus miscellaneous apparatus as needed. Apr 12, 2020 ppt three phase induction motor electrical engineering ee notes edurev is made by best teachers of electrical engineering ee. Electrical engineering video lectures tutorials lecture 16 power ports lecture 24 dc machines part 2 lecture 15 power factor lecture 25 dc generators lecture 22 the practical transformer part 3 lecture 18 transformer basic part 2 lecture 27 dc motors lecture 26 dc generators 2 lecture 37 induction motor 2 lecture 20 the. The 3 phase stator winding is wound for a definite number of poles as per the requirement of speed. In this method of speed control of three phase induction motor, the two three phase induction motors are connected on a common shaft and hence called cascaded motor. Speed control of three phase induction motor electrical4u. Drives, four quadrant operation, equivalent drive parameters lecture3. Fall 2005 ee595s electric drive systems 36 the plan continued achieving 14.
The three phase induction motor is the extensively used for various kinds of industrial drives. You should also make a dc measurement of stator winding linetoline resistance. These are excited by a balanced three phase voltage supply. Nptel provides elearning through online web and video courses various streams. Just like any other motor, a 3 phase induction motor also consists of a stator and a rotor. Apr 02, 2008 lecture series on basic electrical technology by prof. Difference is that transformer is an alternating flux machine while induction motor is rotating flux machine. If a set of three phase current is added to these three coils. Nptel, online courses and certification, learn for free. Induction motor 1 chapter 3 induction motor bee23 electrical machine power system 2 learning outcomes. So, now principle of induction motor right so, the operation of three phase induction.
Field oriented control of a 3 phase ac induction motor ixys its diversified product base of specialized power semiconductors, integrated circuits and rf power is utilized by more than 2500 customers worldwide, ranging across industrial, transportation, telecommunications, computer, medical, consumer and clean tech markets. The construction of the circle diagram is based on the approximate equivalent circuit shown below. Constructional details of a practical single phase transformer, core, winding. The three phase induction motors are simple in construction, rugged, low cost and easy to maintain. Three phase motors are more efficient than single phase motors and are commonly found in applications requiring more than 7. Slip of a power induction motor is 2 to 3 % when the motor is operated under the rated load. Learn for free, pay a small fee for exam and get a certificate. Although the national electric code does not specify specific conductor colors for three phase current, it is common to use black, red and blue wires to identify lines l1, l2. Electrical engineering video lectures from nptel, iit, mit. Nptel syllabus industrial drives power electronics video course 1.
Differentiate between the various types of generating electric power stations. In this module we will be discussing the three phase induction machine. Nov 27, 2019 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. 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. Lecture series on basic electrical technology by prof.
Field oriented control of a 3phase ac induction motor. Find the percentage slip and number of poles of the induction motor. Induction motor basics, single phase and three phase. When 3 phase supply is given to the stator winding, a rotating magnetic field of constant magnitude is produced. However, single phase induction motors does not have self starting torque and are made to. The rotor will constantly be turning to align its magnetic field with that of the stator field. Dec 29, 2017 apr 12, 2020 ppt three phase induction motor electrical engineering ee notes edurev is made by best teachers of electrical engineering ee. The winding wound on the stator of three phase induction motor is also called field winding and when this winding is excited by three phase ac supply it produces a rotating magnetic field. There exist a variety of connections for three phase ac voltage controller. The sinusoidal stator phase currents fed in the stator coils create a magnetic field. It consists dc source amplitude is 500, three phase pwm inverter and three phase induction motor. The above value becomes somewhat larger with small single phase motors. At the end of the lecture, student should be able to. Electrical engineering electrical machines ii nptel.
As induction motors are widely being used, their speed control may be required in many applications. To control the current and voltage of three phase loads, three phase ac voltage controller are required. Characteristics of induction motors nidec corporation. Three phase flange mounted ac induction motors dimensions is 2223 60072 1 specification for energy efficient three phase induction motoris 12615 class of insulation is 1271 60085 conformance to standards.
Three phase induction motors authorstream presentation. Nptel syllabus industrial drives power electronics. Nptel video lectures, iit video lectures online, nptel youtube lectures. Nov 27, 2019 the three phase induction motor is the most widely used electrical motor. Microcontroller based control of three phase induction motor using pwm technique. 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.
Rotating flux is only possible when 3 phase voltage or poly phase which is 120 degree apart in time is applied to a three phase winding or poly phase winding 120 degree apart in space then a three phase rotating magnetic flux is. Cascade control speed control of three phase induction motors. Nptel video lectures, iit video lectures online, nptel youtube lectures, free video lectures, nptel online courses, youtube iit videos nptel courses. Speed control of induction motor using pwm technique. Outer frame and stator of three phase induction motor. Introduction of three phase halffull wave converter. The speed control of three phase induction motor is essential because the motor control industry is a dominant sector.
Construction of three phase induction motor electrical4u. This paper presents design and analysis of a three phase induction motor drive using igbt. Equations 1 3 represent the currents that ow in the three phase windings. Umanand, principal research scientist, power electronics group, cedt, iisc bangalore for more detail. And if it is answers generator it will be just above 1,500 rmp we will not discuss about induction generator only little about motor right. To determine the equivalent circuit parameters of an induction motor. The major difference between them is that transformer is static in nature i. The power drawn from the rotor terminals could be spent more usefully. This strange behavior of single phase induction motor can be explained on the basis of doublefield revolving theory. Lecture series on industrial automation and control by prof. 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 bars forming the conductors along the rotor axis are connected by a thick metal ring at the ends, resulting in a short circuit. This would result in a balanced three phase current. Three phase induction motor drive using igbts and constant v f block diagram of open loop v f control induction motor advanced induction motor v f control including voltage boost and closed loop v f based sd control of induction motor file.
All we need to do is to keep daxis stator current constant. Hence the number of rotor poles must be made equal to the number of stator poles. Circle diagram of an induction motor the circle diagram of an induction motor is very useful to study its performance under all operating conditions. Ppt threephase induction motor electrical engineering ee. Understand the principle and the nature of single phase and 3 phase induction machines. Watch this video to understand the working principals of the three phase induction motors. 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. Threephase induction motor, cage and wound slipring rotor, synchronous and rotor speed, slip, induced voltages in stator winding and rotor bar. Vvvf for controlling the speed of a three phase induction motor im by using vf control strategy in open loop mode.
For reason of economy, most houses, offices and also rural areas are supplied with single phase a. A 3 phase induction motor can be used for different applications with various speed and load requirements. Dc source is connected to the dc side of the converter. In this video basic of construction and working principle of 3 phase induction motor is explained with the help of 3d animation. Lecture 6 three phase induction motors cairo university. Working principle of three phase induction motor video. Basic electrical technology basic electrical technology. The single phase controller described previously can be introduced singly in each phase or line, to form a three phase controller. Search wegthreephaseinductionmotorsmasterline50019089.
They have very simple and rugged almost unbreakable construction. Electrical engineering basic electrical technology nptel. It supplies an induction motor ich has a full load speed of 144wh 0 rpm. L umanand department of power electronics group, cedt iisc bangalore. 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. The three phase squirrelcage induction motor can, and many times does, have the same armature stator winding as the three phase synchronous motor. A three phase, 12 pole, salient pole alternator is coupled to a diesel engine running at 500 rpm. A three phase induction motor runs on a three phase ac supply.
Further, in an induction machine, the windings are not all located in the same. Record all nameplate information for the induction motor. Search wegthreephaseinductionmotorsmasterline50019089brochureenglish. Ppt threephase induction motor electrical engineering. Ac induction motors are also the most common motors used in main powered home appliances. Hi all, let us begin the course on induction motors, in this video, we will have an introduction and basic construction concepts. Single phase machines are restricted to small power levels. The topic lies under the basic electrical and electronics engineering course that covers various other. The 3 phase set of currents, each of equal magnitude and with a phase. Introduction this application note describes the design of a 3 phase ac induction motor drive with volts per hertz control in closedloop vhz cl. Most expected 50 questions 1 3 phase induction motors. Different speed control methods of induction motor are explained below. One motor is the called the main motor, and another motor is called the auxiliary motor. Gopakumar, centre for electronics design and technology, iisc bangalore.
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. Pdf speed control of threephase induction motor based. This document is highly rated by electrical engineering ee students and has been viewed 2470 times. Greater the number of poles, lesser is the speed of the motor and viceversa. Apart from using the heat generated in meaning full ways, the slip ring output could be connected to another induction machine. Lecture 30 speed control of induction motor part 1 youtube. Speed control of a three phase induction motor using pwm. They run at a constant speed from noload to the full load.
It is the diagrammatic representation of the performance of the induction motor. 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. Speed control of three induction motor by vf method for batching motion system. Both types have similar constructed rotor, but they differ in construction of rotor. Perform an analysis on induction machines which is the most rugged and the most. It is based on freescales 56f800e microcontrollers. List and describe the more commonly used equipment in an electric substation. Electrical machines i video course electrical engineering nptel.
The staring torque of induction motor is very high which makes motor useful for operations where load is applied before the starting of the motor. Nptel provides elearning through online web and video courses various. The operation of an induction motor is not possible with an unequal number of stator and rotor poles, and this type of rotor does not respond automatically to change in a number of stator poles. The three phase induction motor is the most widely used electrical motor. Advantages of 3 phase induction motor generally easy to build and cheaper than corresponding dc or synchronous motors induction motor is robust. And generally we will find it is a 4 pole machine, but the magnetic field. Basic electrical technology nptel online videos, courses. Phase wound induction motor slipring induction motor. Basic electrical technology nptel online videos, courses iit video lectures. Introduction types of electrical machines types of 3 ph induction motor basic principle working principle compnents of induction motor application comparision between 1ph i. There are two basic reasons for the use of single phase motors rather than 3 phase motors.
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