Wound rotor induction motor the engineering projects. But the rotor construction differs with respect to the type which is specified above. The construction of stator of the induction motor is almost the same as other motors. Instead of producing rotary torque from a cylindrical machine it produces linear force from a flat one. In operation, the nonrotating stator winding is connected to an alternating current power source. Firstly, i am going to tell you about the structure of squirrel cage induction motor. The threephase induction motor the squirrelcage induction motor the woundrotor induction motor 3 4. Design of a three phase squirrel cage induction motor for. Search wegthreephaseinductionmotorstlinesquirrelcage. Most of the induction motors are of this type because of simple and rugged construction of rotor. Squirrel cage induction motors are the most popular form of motor design for both household appliances and heavy industrial equipment. A squirrel cage rotor is the rotating part of the common squirrel cage induction motor. Section 3 discusses with various methods used for constructing the rotor of a squirrel cage induction motor. Pdf tthis paper describes the primary results of a research project whose aim is the.
An induction motor can therefore be made without electrical connections to the rotor. Learn a brief history of the electrical power systems construction. Watch this video and learn basics of squirrel cage induction motor. The rotor is constructed using a number of single bars shortcircuited by end rings and arranged in a hamsterwheel or squirrelcage configuration. Making a better induction motor induction motors can show large i 2 r losses in the stator winding and in the rotor conductor.
The three phase induction motor is the most widely used electrical motor. Mostafa elshahed objectives learn a brief history of the electrical power systems construction. It is called a squirrel cage motor because the rotor inside of it known as a squirrel cage rotor looks like a squirrel cage. Differentiate between the various types of generating electric power stations. Large induction motors how they work, are designed and.
Closedform analysis of squirrelcage induction motors with. The motor efficiency class and nominal motor efficiency must be stated on the motor nameplate and given in product documentation and motor catalogues. Section 4 investigates problems involved in dcr technology and their solutions to overcome. This paper will focus on the electrical arrangement inside the motor housing, discuss the principles govern. 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. The rotor will constantly be turning to align its magnetic field with that of the stator field. Horizontal squirrel cage mediumvoltage induction motor. An anisotropic homogeneous representation for both squirrelcage rotor and stator windings is used. When a 3 phase supply is given to the stator winding it sets up a rotating magnetic field in space. The rotor is same as that employed in 3phase squirrel cage induction motor. 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. An induction motor is based on the principle of induction of voltages and currents.
A squirrelcage rotor is the rotating part of the common squirrelcage induction motor. The field windings in the stator of an induction motor set up a rotating magnetic field through the rotor. The stator the rotor the squirrelcage and the woundrotor induction motor have. In this article, we will learn about squirrel cage and slip ring induction motors. A wound rotor or slip ring motor has a 3phase winding, similar to the stator. Mainly we discuss a threephase squirrel cage induction motor.
How they work, how they are designed and constructed induction motor construction stator iron core with slots copper windings connected to ac power source squirrel cage rotor conductors arranged like bars in a squirrel cage imbedded into an iron core iron core is mounted on motor shaft. These motors are having the difference in rotor construction. A matlab mfile to calculate and plot the two torquespeed characteristics is shown. This standard covers the minimum requirements for special purpose formwound squirrel cage induction motors 375 kw 500 hp and larger for use in petroleum, chemical, and other industry applications. In turn these currents lengthwise in the conductors react with the magnetic field of the motor to continue reading. Design of a threephase squirrelcage induction motor based on efficiency maximization using fem software mucet2008paper no here conference paper pdf available march 2008 with 2,981 reads. Induction motor equivalent circuit from the preceding, we can utilise the equivalent circuit of a transformer to model an induction motor. Control of motor characteristics by squirrelcage rotor design. Novel manufacturing technologies for high power induction. The reactance x2 in an induction motor equivalent circuit represents the referred. Menzel squirrel cage motors are available in all standard motor cooling and protection types for lowvoltage from 75 kw as well as medium. Also the rotor bars are usually not quite parallel to the rotor shaft but are mounted in a slightly skewed position. Oct 19, 20 three phase squirrel cage induction motor with inverter section model 0100hz. Select number of stator slots and suitable three phase winding layout.
Most large induction motors use aluminum extensively in the rotor squirrel cage and structure for light weight and ease of manufacturing however, the highest efficiency variants use. A squirrelcage motor with this type of rotor construction is called. Equivalent circuit of an induction motor enables the performance characteristics which are evaluated for steady state conditions. Today, i am going to tell you about a wound rotor induction motor, which is also a type of 3 phase induction motor. Dobrovolsky added a lot to practicality 3 phase theory and rotor construction. Further research needs to be carried out on the performance behaviour of this machine.
The following table outlines that difference in each construction, working principles and services needs. On the following pages the basic operation and types of ac singlephase induction motor types will be covered. Kanpur, india design of a three phase squirrel cage induction motor for electric propulsion system ravi prakash,mohammad junaidakhtar, r. It consists of a cylinder of steel laminations, with aluminum or copper conductors embedded in its surface. The rotor and stator windings are connected in parallel. A 1phase induction motor is similar to a 3phase squirrel cage induction motor in physical appearance. The rotor in single phase induction motor is of squirrel cage rotor type. Squirrel cage rotor and slip ring rotor squirrel cage vs wound rotor duration. The squirrelcage induction motor linkedin slideshare. Third international conference on advances in control and optimization of dynamical systems march 15, 2014. In my last article, we have discussed squirrel cage induction motor which is a type of 3 phase induction motor. The basic idea of an electric motor is to generate two magnetic fields. There is uniform air gap between stator and rotor but no electrical connection between them. Slip ring induction motor is made up from wound rotor and squirrel cage induction motor is made up from the squirrel cage rotor.
Indution vs permanent magnet motors, ieee industry applications magnazine, pp. Squirrel cage induction motor the engineering projects. 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. Teco totally enclosed fan cooled squirrelcage induction motors are designed, manufactured and tested to meet or exceed the latest nema, ieee, csa and other international standards. What are the advantages of a squirrelcage induction motor. The iec 60034301 is part of an effort to unify motor testing standards, efficiency requirements and product. This rotor is a cylinder of steel laminations, with highly.
Threephase induction motors construction consist of. Squirrel cage induction motors menzel elektromotoren. The sinusoidally distributed flux density wave is moving at slip speed inducing in the rotor cage voltages of magnitude indicated by the blue vertical lines. Observation of no load test i o amp v o volts pin watts stator cu loss. The construction of stator for any induction motor is almost the same. Squirrel cage wound rotor with slip rings the rotating magnetic field the basic idea of an electric motor is to generate two magnetic fields. Improving squirrel cage induction motor efficiency. Design of a threephase squirrelcage induction motor based on efficiency maximization using fem software mucet2008paper no here. Slipring or woundrotor induction motors construction of squirrel cage induction motor any induction motor has a stator and a rotor.
These motors are suitable for all general applications where an open machine is not applicable due to severe environments such as excessive dirt, dust andor moisture. Kalsi group product categories squirrel cage induction motors. The motor employing this type of rotors are known as squirrel cage induction 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. May 20, 2015 the threephase induction motor the squirrel cage induction motor the woundrotor induction motor 3 4. 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. Jul 25, 2019 a 3 phase squirrel cage induction motor is a type of three phase induction motor which functions based on the principle of electromagnetism. Designing of three phase squirrel cage induction motor for. Construction of squirrel cage induction motor explained. The rotor bars are not insulated from the rotor core because they are made of metals having less resistance than the core. An induction motors rotor can be either wound type or squirrel. The rotor is constructed using a number of single bars shortcircuited by end rings and arranged in a hamsterwheel or squirrel cage configuration. Pdf design of a threephase squirrelcage induction motor.
They were used for the most challenging tasks where no alternatives were available. In three phase induction motor, the power is transferred from stator to. How they work, how they are designed and constructed induction motor construction stator iron core with slots copper windings connected to ac power source squirrel cage rotor conductors arranged like bars in a squirrel cage imbedded into. A simple explanation of squirrel cage induction motors. Oct 10, 2016 hi friends, i hope you are fine and having fun. Circuit diagram of squirrel cage induction motor is shown in fig. Three phase induction motor construction your electrical. It converts electrical energy into mechanical energy and it is used to provide motion. Know about the most popular and almost unbreakable construction of squirrel cage induction motor.
Learn the working principle and applications of a squirrel cage induction. Construction of three phase induction motor electrical4u. Former is cheaper and broadly used as it requires less maintenance than later one. Threephase squirrel cage induction motors are widely used in industrial drives because they are rugged, reliable and economical. Pdf improving squirrel cage induction motor efficiency. The technology is not new but merely designed in a. He made great prototypes and presented the motor like a showman at technical gatherings. Parida department of electrical engineering national institute of technology, silchar,assam, india email. But the rotor construction differs with respect to the type of motor. Squirrel cage induction motor and wound rotor induction motor. Prior to power electronics and advanced ac motor control being available dc motors were favourable solely from a technical and control point of view.
How are squirrel cage induction motors constructed. 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. When voltage is applied to the stator winding, a rotating magnetic field is established. Three phase squirrel cage induction motor with inverter section model 0100hz.
Also appreciate the rugged construction of squirrel cage rotor and know the spectacular reasons for the skewed arrangements of the rotor conductors. Scope regulation eu 42014 covers single speed, threephase, 50 hz and 60 hz induction motors with. Nov 27, 2019 the three phase induction motor is the most widely used electrical motor. As there are no brushes and slip ring, these motors requires less maintenance. Lecture 6 three phase induction motors cairo university. The squirrel cage induction motor was designed for an extended service life under very demanding conditions. The squirrel cage induction motor is the most commonly used motor in industry. The relative motion between this field and the rotation of the rotor induces electric current in the conductive bars. Squirrel cage construction, the rotor winding consists of a number of rotor bars, shortcut by rings from both side, see figure below.
This standard can also be used for induction generators by substituting generator for. The voltage and current is induced in the rotor circuit from the stator circuit for the operation. The induction motor is mod eled as six concentric cylindrical layers representing the different construction components of the motor. Why are threephase squirrelcage induction motors commonly. Squirrel cage rotor almost 90 per cent of induction motors are squirrel cage type, because this type of rotor has the simplest and most rugged construction imaginable and is almost indestructible. The construction of single phase induction motor is almost similar to the squirrel cage three phase motor except that in case of asynchronous motor the stator have two windings instead of one as compare to the single stator winding inthree phase induction motor. Some sections may explain explicitly between the three configurations, but have different requirements for each. Modelling and analysis of squirrel cage induction motor with. Menzel squirrel cage induction motors are manufactured for various industries and industrial applications of all kinds. Slipring motor slip control with woundrotor induction motor historically, electrical devices for speed control were complex to handle and expensive. An induction motor s rotor can be either wound type or squirrel cage type. In traditional designs of 60 hz linefed induction machines, skin effect is represented by correction coefficients k r and k x for bar resistance and slot leakage inductance. Mainly because they are cheap, robust, selfstarting.
The 3phase set of currents, each of equal magnitude and with a phase. A squirrel cage rotor consists of a laminated cylindrical core having semiclosed circular slots at the outer periphery. Oct 09, 2016 a 3 phase induction motor has two types based on the rotor construction, named as. However, should the motor require service, this manual includes a section that assists the. Torquespeed characteristics of three phase squirrel cage. The conversion process is electromagnetic induction. These motors are tested to strict quality control for routine and type tests at every stage of production and are ideally suitable for various. In the equivalent circuit r 1 represents, the resistance of the stator winding and x 1 the stator leakage reactance flux that does not link with the air gap and rotor. It is low cost and requires low maintenance in comparison with other motor types. List and describe the more commonly used equipment in an electric substation. Information and recommendations for the engineer fe1100. A 3 phase induction motor has two types based on the rotor construction, named as.
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