In this work a conventional three phase squirrelcage type induction motor with specifications 10 hp, 415v, stardelta connected and 4 poles is chosen for comparison with our motor, which is designed for good efficiency. There are different methods of starting of 3 phase slip ring induction motor. The rotor winding terminals are connected to three slip rings which turn with the rotor. A springloaded auxiliary manual starting switch connected power to this. The frequency of rotor induced emf of 400v, three phase, six pole induction motor is 2hz. Torqueslip characteristics in three phase induction motor. The rotor core is made up of steel laminations which have slots to. Be specially designed for energy saving purpose which is totally enclosed and fancooled type. Compared to squirrel cage rotors, wound rotor motors are. Makwana and others published three phase slip ring induction. This document is highly rated by electrical engineering ee students and has been viewed 2470 times. Threephase squirrelcage induction motors dominate application above 1 hp. This type of rotor has a 3 phase, doublelayer, distributed winding consisting of coils used in alternators.
Slip ring induction motors are usually started by connecting starting resistance in the secondary. A 480v, 60 hz, 6pole, threephase, deltaconnected induction motor has the. And determine the full load regulation of a three phase synchronous generator by synchronous impedance method. The rotor of the slip ring induction motor is also cylindrical or constructed of lamination. Induction motor 1 chapter 3 induction motor bee23 electrical machine power system 2 learning outcomes.
Rotor induction motor an overview sciencedirect topics. Perform an analysis on induction machines which is the most rugged and the most. Slip ring induction motor srim vs squirrel cage induction motor scim. There are two types of rotors which are employed in 3 phase induction motor. Understand the principle and the nature of single phase and 3 phase induction machines. Apr 12, 2020 ppt three phase induction motor electrical engineering ee notes edurev is made by best teachers of electrical engineering ee. The indus3 series general purpose ac three phase induction motors have been designed and engineered in compliance with latest technical knowledge and production processes and has attained highest standards in both the fields. Pdf this work has developed a steadystate and dynamic mathematical model. Cage induction motor an overview sciencedirect topics. At the end of the lecture, student should be able to. Iiwound rotor slip ring motor squirrel cage induction motor is generally preferred.
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. When the 3 phase supply is provided to the stator, a magnetic field is produced which rotates the rotor and motor starts. Good performance, such as high safety, energy saving, compact design, low noise, little vibration, high torque big breakaway torque, reliable operation, stable running and convenient maintenance. Jzr2 yzr series ac crane lifting wound rotor slip ring motors.
Search weglowandhighvoltage three phase slip ring rotorvertical11734748manualenglish. The induction motor is started by itself that we know. The slip of the induction motor varies from 5 percent for small motors to 2 percent for large motors. Generally, it is known as the asynchronous motor because its running speed is less than its synchronous speed. If the slip ring induction motor is started with all the slip rings or the rotor.
Wound rotor induction motors with three rotor slip rings have been used in adjustable speed drives for. Stator winding can be either star or delta connected depending upon the design. The three phase induction motors are simple in construction, rugged, low cost and easy to maintain. Motors specification of electric motors marshall wolf automation. Designing of three phase squirrel cage induction motor for. Download 3 phase tefv induction motors slip ring or cage type book pdf free download link or read online here in pdf. Pdf three phase slip ring induction motor drive with. As we know that, the speed of rotor cannot be equal to synchronous speed i. As we know, the slip speed is the difference between the synchronous and rotor speed of the induction motor. The aim behind the development of the project is to limit the current at starting of motor and to develop the high starting torque. For induction motor, 0 three phase power supply is connected to the three phase stator winding of induction motor, a rotating magnetic field is produced in the air gap.
Three phase slip ring induction motor drive with slip power control analysis for different load torque using microsoft excel as software tool. Wound rotor induction motors ac motors electronics. In the induction motors used in lift and hoists, you will see a type of rotor called a slip ring rotor, whereas in most of. An887, ac induction motor fundamentals microchip technology. A wound rotor or slip ring motor has a 3phase winding, similar to the stator winding. Three phase slip ring induction motor drive with slip power control analysis for different load. The slip ring motor has very little application in industries. Srim rotor construction is very complicated but in scim the rotor construction is. Srim rotor consists of a three phase winding similar to the stator winding, but in scim the rotor consists of bars which are shortened at the ends with help of end rings. Explain starting methods of 3 phase induction motor. The slip ring motors in our mebsgr series that are described in the following text are in the ic 411 cooling class, known as surfacecooled or ribbedcooled. By putting resistance in series with the rotor windings, the starting current can be kept low while mainta. Whenever possible a squirrel cage threephase motor should. Three phase slip ring induction motor a wound rotor or slip ring motor has a 3 phase winding, similar to the stator winding.
Low and high voltage three phase induction motors m line squirrel cage rotor horizontal date. Slip in electrical induction motors engineering toolbox. This manual covers squirrel cage rotor motor where the rotor. Fault identification of 3phase slip ring induction motor. Squirrel cage wound rotor with slip rings the rotating magnetic field. Fault identification of 3phase slip ring induction motor free download as powerpoint presentation.
Induction motors have been ruling the industrial world for many decades. Why the air gap bw the stator core and rotor of an induction motor is made very. Because its run at a speed other than the synchronous speed of rotating magnate field developed by the starter current. Why the induction motor is called asynchronous motor. Slipring induction motors in conjunction with rotor resistanceswitching contactors are. The slip rings brushes allow external resistors to be connected in series with the winding. It is very commonly used in industries because it is very cheap, robust, efficient, and reliable. They are classified either as squirrel cage or woundrotor motors. Slip ring induction motor fundamentals pnpntransistor. Three phase slip ring induction motor my tech info. Rotor has a winding the same as stator and the end of each phase is connected to a slip ring. But at the starting of the induction motor, starting current is very large which may damage motor windings. The rotor winding terminals are connected to three slip rings which turn with. The three phase induction motor is the most widely used electrical motor.
Threephase cage induction motors are the most widely used for ancillary mechanical plant. This work has developed a steadystate and dynamic mathematical model of three phase slipring induction motors with external impedance. The stator of slip ring induction motor is very much the same as that of the squirrel cage induction motor, but the construction of its rotor is very much different. Read online 3 phase tefv induction motors slip ring or cage type book pdf free download link book now. There are two basic reasons for the use of single phase motors rather than 3 phase motors. Threephase motors with slipring rotor for intermittent periodic duty. For reason of economy, most houses, offices and also rural areas are supplied with single phase a. A slip ring, three phase induction motor rotates at a speed of 1440rpm, when a supply of 400v, 50hz is applied across the stator terminals. Weg, which began in 1961 as a small factory of electric motors, has become a leading global supplier of. When a motor starts to rotate the slip is 100 % and the motor current is at maximum.
Speed control of three phase slip ring induction motor by rotor resistance control. A typical twophase ac servomotor has a squirrel cage rotor and a field. The threephase motor design was also worked on by the swiss engineer. Construction of three phase induction motor electrical4u. The 3 phase 4 pole induction motor electric motor turns because of magnetic force is. Types, construction and principle of operation, 3 phase induction motor, general. Low and high voltage three phase induction motors m line squirrel cage rotor. Low and high voltage three phase induction motors slip ring rotor fixed brushholderm line date. In the slip ring induction motor, there is an option to reduce this emf current phase difference, by use of external resistance. The slip ring induction motor was developed a short time later. Induction motor seminar ppt, pdf report study mafia.
Free download induction motor seminar ppt, pdf report. Torque slip characteristics in three phase induction motor as the induction motor is located from no load to full load, its speed decreases hence slip increases. The slip ring induction motor could be used for industrial wires where variable speed and high starting torque are prime requirements. The other ends of the coils are connected to an external resistance via the slip rings fig. Because of its simplicity and cheapness, the 3 phase squirrelcage induction motor is now by far the most common type of motor in use for driving industrial plant, particularly of small power ratings up to 20 kw. Introduction types of electrical machines types of 3 ph induction motor basic principle working principle compnents of induction motor application comparision between 1ph i.
Slip ring induction motor is induction motor where there is 3 phase winding on rotor and slip rings are connected with each phase winding. Sl no apparatus name apparatus type specification range makers name serial no 1 induction motor 2 ammeter 3 voltmeter 4 resistance theory. Threephase ac induction motors are widely used in industrial and commercial applications. What is the working principle of slip ring induction motor. Ppt threephase induction motor electrical engineering.
An operating and maintenance manual, a terminal plan and. A wound rotor induction motor has a stator like a squirrel cage induction motor, but a rotor with insulated windings brought out via slip rings and brushes however, no power is applied to the slip rings. Their sole purpose is to allow resistance to be placed in series with. Pdf three phase slip ring induction motor drive with slip power. Slip and motor current are reduced when the rotor begin turning.
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