Construction of squirrel cage induction motor explained. It is simple and relatively inexpensive, and the absence of sliding contacts in the squirrel cage machine reduces maintenance to a minimum. What is a squirrel cage motor and how does it work. Thanks to this, we are able to reduce the generator expenses and the rest of the costs. The stator winding is assumed to be yconnected with the access to the phase terminals. For motors falling outside this description, the more comprehensive model specifications below are recommended. A motor rating of 10 horse power, 415 volts with 1440 rpm and 4pole is selected for design problem and an equivalent circuit model is developed to find out the various performance parameters like efficiency, starting torque, torque. Know about the most popular and almost unbreakable construction of squirrel cage induction motor. With pdf merger you can merge your multiple pdf files to a single pdf file in matter of seconds. Jul 27, 2019 hamsters arent indigenous to the america.
Stator with laminated iron core slots with winding bars ring to short. A squirrelcage rotor is the rotating part of the common squirrelcage induction motor. These vectors may then be directly associated with the perphase phasors of the induction motor, combined in a phasor diagram, and interpreted by means of an equivalent cicuit made up of a magnetizing inductance in parallel with the rotor leakage inductance acting in series with a resistor. Squirrel cage induction motors menzel elektromotoren.
Nov 27, 2019 the three phase induction motor is the most widely used electrical motor. In first comparison, motor was supplied from laboratory source. For reason of economy, most houses, offices and also rural areas are supplied with single phase a. Watch this video and learn basics of squirrel cage induction motor. In operation, the nonrotating stator winding is connected to an alternating current power source. When voltage is applied to the stator winding, a rotating magnetic field is established. The most used generator is the double feed induction generator dfig, and we suggest to change it by squirrel cage induction generator scig, owing to the robustness of scig, and since it has low cost with an almost null maintenance. Cage induction generators for wind turbines with power. Menzel squirrel cage motors are available in all standard motor cooling and protection types for lowvoltage from 75 kw as well as medium and high voltage up to 25000 kw 25 mw. Analysis and design of ac induction motors with squirrel cage rotors by shine ho university of new hampshire, september, 1996 the traditional approach to modelling the ac induction motor revolves around the wellknown equivalent t circuit model. Model repair specifications for low voltage induction motors.
The rotor cage having nr n bars is viewed as nidentical. Basic induction motor concepts the development of induced torque in an induction motor. Designing of three phase squirrel cage induction motor for. Motors employing this type of rotor are known as squirrel cage inductionmotors. Who invented the squirrel cage name for an induction motor. Easily combine multiple files into one pdf document.
Introduction to induction motor the engineering projects. In this work a conventional three phase squirrel cage 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. The squirrel cage motor is different from a dc motor. Test motor was tested on bench to experimentally verify the results. The working of an induction motor can be summarized as, the stator winding produces magnetic field and due to electromagnetic induction a current is induced in rotor which produces torque. Normally, we use the motors in industrial drives because they are rugged, reliable and economical. Precise concept of these equations and the way of using them require spending too much time and using other references. It consists of a cylinder of steel laminations, with aluminum or copper conductors embedded in its surface.
Lecture 6 three phase induction motors cairo university. Firstly, i am going to tell you about the structure of squirrel cage induction motor. The induction motor is mod eled as six concentric cylindrical layers. Three phase squirrel cage induction motor with inverter section model 0100hz. Mostafa elshahed objectives learn a brief history of the electrical power systems construction. The motor efficiency class and nominal motor efficiency must be stated on the motor nameplate and given in product documentation and motor catalogues. List and describe the more commonly used equipment in an electric substation. Modelling and analysis of squirrel cage induction motor.
The basic idea of an electric motor is to generate two magnetic fields. Analysis and design of ac induction motors with squirrel. If any particular phase fails the continuity test, your motor is probably burnt. And in the previous article on types of electrical motors, we have classified induction motors based on the type of rotor used. This paper deals with analysis of high speed squirrel cage induction motor. Comparison between direct and indirect field oriented. Data sheet three phase induction motor squirrel cage. Model repair specifications for low voltage induction motors these model repair specifications are intended to cover routine repair and rewind of lowvoltage randomwound threephase ac squirrel cage induction motors. Pdf improving squirrel cage induction motor efficiency. Combines pdf files, views them in a browser and downloads.
The torque of the induction motor depends on the rotor resistance. Torquespeed characteristics of three phase squirrel cage. Nov 18, 2015 induction motor torquespeed characteristics figure 6. There are two types of induction motors, one is named as single phase induction motor, while the second one is named as 3 phase induction motor. A synchronous motor may have a squirrel cage winding embedded in its rotor, used to increase the motor starting torque and so decrease the time to accelerate to synchronous speed. Tesla, however, exploited the principle to design a unique twophase induction motor in 1883. The rotor of an induction motor can be a squirrel cage rotor or wound. Energy efficient induction motors three phase squirrel. Variable voltage variable frequency vf control theory an induction motor compared to a dc motor has some major advantages such as absence of brushes, commutator segments, rugged construction, being cheap, lesser maintenance requirements and smaller. Our pdf merger allows you to quickly combine multiple pdf files into one single pdf document, in just a few clicks. Squirrel cage motors maximize electromagnetic induction by utilizing rotor bars to. For each pump, there is an optimum operation point related to the optimum. How to test three phase ac motors learning electrical.
Modeling and control of squirrel cage induction generator. The three phase induction motor is the most widely used electrical motor. Parameters description table of three phase squirrel cage induction motor i l amp. When a 3 phase supply is given to the stator winding it sets up a rotating magnetic field in space. Menzel squirrel cage motors are available in all standard motor cooling and protection types for lowvoltage from 75 kw as well as medium. The effect of stator slots and teeth is included by a second anisotropic homogeneous medium. Squirrel cage induction motor the engineering projects. Modelling and analysis of squirrel cage induction motor with leading reactive power injection. Aluminum bars are molded on the slots and shortcircuited at both ends with a ring. The rotor of a squirrel cage induction motor is shor.
The threephase squirrel cage induction motor 411 characteristics of a squirrel cage induction motor g 7. A squirrel cage rotor is the rotating part of the common squirrel cage induction motor. The magnetization current im flowing in the motor s equivalent circuit fig. In this approach, the direct connection from geometry to performance is suppressed.
Oct 19, 20 three phase squirrel cage induction motor with inverter section model 0100hz. Search wegthreephaseinductionmotorstlinesquirrelcage. The construction of stator of the induction motor is almost the same as other motors. Induction motor is an ac electric motor, having a stator and a rotor just like other motors, but the working principle is a little different which would be discussed further. May 16, 2015 typical rotor speeds for squirrel cage induction motors are. What are the advantages of a squirrelcage induction motor. Also appreciate the rugged construction of squirrel cage rotor and know the spectacular reasons for the skewed arrangements of the rotor conductors. The squirrel cage induction motor being simple, rugged, and cheap and requiring less maintenance, has been widely used motor for fixed speed application.
Dec 10, 2015 watch this video and learn basics of squirrel cage induction motor. Slip ring induction motor is made up from wound rotor and squirrel cage induction motor is made up from the squirrel cage rotor. How are squirrel cage induction motors constructed. The reason for the name squirrel cage is because of the type of rotor used in these motors. Studying and improving of squirrel cage induction motor scim efficiency is a continuous area of interest not only among the researchers but also the industry, manufacturer and government. Turn on the power supply and set the voltage control knob so that the line voltage indicated by meter e1 is equal to the nominal line voltage of the squirrel cage induction motor.
This setup is connected to the grid through back to back converters, as schematically shown in fig. Pdf in this research, a new easy and fast correlations derived from practical data for the design single phase squirrel cage induction motor that. Low and high voltage three phase induction motors m line squirrel cage rotor horizontal date. The 3phase set of currents, each of equal magnitude and with a phase. Other articles where squirrelcage rotor winding is discussed. Analysis and design of ac induction motors with squirrel cage rotors. In three phase induction motor, the power is transferred from stator to. The rotor will constantly be turning to align its magnetic field with that of the stator field. The rotor is constructed using a number of single bars shortcircuited by end rings and arranged in a hamsterwheel or squirrel cage configuration. The motor uses a squirrel cage rotor, which has a laminated iron core with slots.
Researchers were not able to successfully breed and domesticate hamsters until 1939. Single phase induction motor this singlephase motors are truly twophase machines. Summary of changes performed checked date performed by joseconde checked by marcioaf date 03082016 152016 page 11 revision 2. Squirrel cage induction motor and wound rotor induction motor. Scope regulation eu 42014 covers single speed, threephase, 50 hz and 60 hz induction motors with. A 3 phase induction motor has two types based on the rotor construction, named as. Introduction cage rotor induction motor im is widely accepted as the most potential candidate for electric propulsion owing, to their reliability, robustness, less maintenance and ability to work in hostile environments. Squirrel cage wound rotor with slip rings the rotating magnetic field. Squirrel cage rotor and slip ring rotor squirrel cage vs wound rotor duration. The rotating magnetic field principle, though commonly cred to nikola tesla in 1882 or thereabouts, was employed by scientists such as michael faraday and james clerk maxwell in the 1820s. Pedra, joaquim 2015 squirrelcage induction motor parameter estimation using a variable frequency test. This free online tool allows to combine multiple pdf or image files into a single pdf document. A 55 kw motor generator set of squirrel cage induction machines with a wind emulator to control the torque is used as model for the wind farm.
These induction motors require special attention during its design process boldeo and nasar 2002. Closedform analysis of squirrelcage induction motors with. The polyphase induction motor the polyphase induction motor is the most commonly used industrial motor, finding application in many situations where speed regulation is not essential. Construction of three phase induction motor electrical4u. 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. Soda pdf merge tool allows you to combine pdf files in seconds. The induction motor was invented by nikola tesla much earlier than this around 1891. Menzel squirrel cage induction motors are manufactured for various industries and industrial applications of all kinds. Design of a three phase squirrel cage induction motor for.
A 3 phase ac induction motor photoed by hordu motor. Squirrel cage rotor almost 90 per cent of induction motors are squirrel cage type. The major divergence between calculated and measured results are because of input power. There are two basic reasons for the use of singlephase motors rather than 3phase motors.
In such machines there is no need to insulate the conductors from the iron. Soda pdf is the solution for users looking to merge multiple files into a single pdf document. This operating manual has been created for threephase squirrel cage single and dual speed induction motors, with. Former is cheaper and broadly used as it requires less maintenance than later one. Pdf merge combine pdf files free tool to merge pdf online. This rotating magnetic field has a speed which is known as the synchronous speed this rotating magnetic field induces the voltage in rotor bars and hence shortcircuit currents start flowing in the rotor bars.
A wide variety of three phase squirrel cage induction motor options are available to you, such as threephase, singlephase. Motors employing this type of rotor are variously known asphasewound motors or wound motors or as slipring motors. 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. Advantages of three phase squirrel cage induction motor. The behavior of a squirrelcage induction motor in the case of opencircuit noload and short circuit with math equations. The magnetization current im flowing in the motors equivalent circuit fig. Oct 09, 2016 a 3 phase induction motor has two types based on the rotor construction, named as. For motors up to about 300 kilowatts, the squirrel. Differentiate between the various types of generating electric power stations. This article presents an understanding of what squirrel cage induction motors are.
What are the specific applications of squirrel cage and. Hp squirrelcage induction motor which you have to parameterize. The principle of working of squirrel cage and slip ring induction motor is based on faradays law of electromagnetic induction. How to merge pdfs and combine pdf files adobe acrobat dc. Analysis of efficiency characteristics of squirrel cage induction motor 75 efficiency h sb was calculated on the basis of 23, as illustrated in figure 3. Nov 03, 2019 an induction motor also known as an asynchronous motor is a commonly used ac electric motor. For three phase motors, connection type is either star y or delta ac motor winding continuity test using a multimeter, check the continuity of motor winding from phase to phase u to v, v to w, w to u. Almost 95% of the induction motors used is of squirrel cage type. It consists of a cylinder of steel laminations, with aluminum or copper. Improving squirrel cage induction motor efficiency. Working principle of 3 phase squirrel cage induction motor. Squirrelcage rotor winding machine part britannica. Each phase to phase must have a continuity if winding is ok.335 431 395 557 109 1256 15 618 412 942 1075 1334 1517 1461 1189 1432 1429 1239 956 622 268 782 443 53 155 474 1052 487 1232 143 143