Almost 95% of the induction motors used is of squirrel cage type. The threephase induction motor the squirrelcage induction motor the woundrotor induction motor 3 4. Design of speed controller for squirrelcage induction. However, it reduces substantially in a slipring motor due to the high impedance of the rotor circuit. In turn these currents lengthwise in the conductors react with the magnetic field of the motor to continue reading. Former is cheaper and broadly used as it requires less maintenance than later one. It is called a squirrel cage motor because the rotor inside of it known as a squirrel cage rotor looks like a squirrel cage. 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. A startstop switch and a handautomatic switch shall be installed near the motor. Solid state speed control of a squirrelcage induction motor. May 20, 2015 the threephase induction motor the squirrel cage induction motor the woundrotor induction motor 3 4. Modeling and control of squirrel cage induction generator. Squirrel cage wound rotor with slip rings the rotating magnetic field the basic idea of an electric motor is to generate two magnetic fields. It also involves its switchgears to control its starting.
Menzel squirrel cage motors are available in all standard motor cooling and protection types for lowvoltage from 75 kw as. Induction motor seminar ppt, pdf report study mafia. Induction motor and squirrel cage motor are two alternative names for exactly the same thing. The rotor is same as that employed in 3phase squirrel cage induction motor. Recall that leakage reactance is the reactance due to the rotor flux lines that do not also couple with the stator windings. In this paper, the development of speed control system for three phase squirrel cage induction motor using a vector control method is presented and simulation for proposed system is done with the help of matlab simulink. Free download induction motor seminar ppt, pdf report. The principle of working of squirrel cage and slip ring induction motor is based on faradays law of electromagnetic induction. Slipring induction motor over squirrel cage induction motor. Modelling and analysis of squirrel cage induction motor with. It is used in a number of applications in home appliances and commercial uses such as pumps, compressors, fans, mixers, conveyors, crushers, machine tools, cranes, etc.
Third international conference on advances in control and optimization of dynamical systems march 15, 2014. 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. Consequently, mathematically it is possible to impose also two reference values in the control system of the sqcim. Now let us discuss in detail, the most common form of induction motor, the squirrel cage induction motor. The outer bars consists of rotor bars having low reactance and high resistance. For the record, there is also such a thing as a woundrotor induction motor but these are relatively rare. However, should the motor require service, this manual includes a section that assists the. Kanpur, india design of a three phase squirrel cage induction motor for electric propulsion system ravi prakash,mohammad junaidakhtar, r. The first ac commutatorfree threephase induction motors were. Construction of squirrel cage induction motor explained. A survey of speed and flux control structures of squirrel cage induction motor drives 7 frequency of the supply voltage. Bnspem04 specification for for a squirrel cage induction.
As the name indicate the double cage induction motor has two winding in rotor. Sep 27, 2016 the most commonly used is the squirrel cage induction motor. Control of motorcharacteristics by squirrelcage rotordesign the reactance x2 in an induction motor equivalent circuit represents the referred form of the rotors leakage reactance. Section 2 presents internal dynamics of the induction motor in state space form. On a mathematical model of squirrelcage induction motors.
Faculty of engineering tobruk, faculty of engineering benha2 1, 2. When a 3 phase supply is given to the stator winding it sets up a rotating magnetic field in space. The fourpole squirrelcage induction motor, cutaway, model 82211, is identical to the fourpole squirrelcage induction motor, model 8221, except that a quarter of the machine has been cut away, revealing the different parts of the stator and rotor. The squirrel cage induction motor was designed for an extended service life under very demanding conditions. A 1phase induction motor is similar to a 3phase squirrel cage induction motor in physical appearance. Menzel squirrel cage induction motors are manufactured for various industries and industrial applications of all kinds. Kalsi group product categories squirrel cage induction motors. Oct 09, 2016 a 3 phase induction motor has two types based on the rotor construction, named as. Firstly, i am going to tell you about the structure of squirrel cage induction motor. Horizontal squirrel cage mediumvoltage induction motor.
Designing of three phase squirrel cage induction motor for. Design of a three phase squirrel cage induction motor for. Induction motors the three phase squirrel cage ac induction motor is the most widely used motor. Squirrel cage induction motors are very prevalent in industry, in sizes from below 1 kilowatt 1. Direct torque and flux control of squirrel cage induction motor. Design of speed controller for squirrelcage induction motor. Torquespeed characteristics of three phase squirrel cage. A 3 phase induction motor has two types based on the rotor construction, named as. Squirrel cage definition and meaning collins english dictionary. Speed control of three phase squirrel cage induction motor.
Control of motorcharacteristics by squirrelcage rotordesign. Parida department of electrical engineering national institute of technology, silchar,assam, india email. This rotor is a cylinder of steel laminations, with highly. Rational systems for the drives of hoisting cranes, roller conveyors, and elevators are solved taking into account specific features of the operation of inductions motors with the squirrel cage rotor in a frequency regulation system. Know about the different winding slots, lamination of the stator and its construction. Further research needs to be carried out on the performance behaviour of this machine. There is uniform air gap between stator and rotor but no electrical connection between. The torque of the induction motor depends on the rotor resistance.
Speed control is not possible in squirrel cage induction motor. The starting of an induction motor does not relate to simple switching alone. Search wegthreephaseinductionmotorstlinesquirrelcage. What are the advantages of a squirrelcage induction motor. What are the specific applications of squirrel cage and. In addition to saving electric energy in some cases up to 70% operational parameters of equipment accuracy, power efficiency, etc.
The bars forming the conductors along the rotor axis are connected by a thick metal ring at the ends, resulting in a. This paper presents a mathematical model of 3phase squirrelcage induction motor accounting for a very high number of space harmonics in which, due to application of a special transformation of voltages and currents, a differential equation system with constant coefficients is. The relative motion between this field and the rotation of the rotor induces electric current in the conductive bars. 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. The squirrelcage induction motor linkedin slideshare. Squirrel cage definition and meaning collins english. So no text or picture will be able to show you any difference. The rotor is constructed using a number of single bars shortcircuited by end rings and arranged in a hamsterwheel or squirrelcage configuration. This paper presents a mathematical model of 3phase squirrel cage induction motor accounting for a very high number of space harmonics in which, due to application of a special transformation of voltages and currents, a differential equation system with constant coefficients is obtained. Concluding, advantage of induction motor is its simple operation, reliability and low cost. In a motor control system usually a loop is dedicated to the mechanical quantities.
The rotor of a squirrel cage induction motor is shor. 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. Oct 19, 20 three phase squirrel cage induction motor with inverter section model 0100hz. Squirrel cage induction motors menzel elektromotoren. This example is prepared by petru brad politehnica university of timisoara faculty of electrical engineering. A squirrelcage rotor is the rotating part of the common squirrelcage induction motor. Also lets get to know the methods which are used to control the speed of squirrel cage. Introduction to induction motor the engineering projects. Pdf speed control of squirrel cage induction motor sqim. The field windings in the stator of an induction motor set up a rotating magnetic field through the rotor. Squirrelcage induction motor simulation quickfield fea. Wems understanding of application requirements and our commitment to customer satisfaction are an important part of our total quality customer focused culture. A squirrel cage induction motor therefore draws a very high starting current, as noted in section 1. Select at least one product to add to your shopping list.
Know about the most popular and almost unbreakable construction of squirrel cage induction motor. The fourpole squirrel cage induction motor, cutaway, model 82211, is identical to the fourpole squirrel cage induction motor, model 8221, except that a quarter of the machine has been cut away, revealing the different parts of the stator and rotor. Specific features of the operations of an induction motor. Mainly we discuss a threephase squirrel cage induction motor. In section 3, the different speed control techniques of an ac motor are discussed. Advantages and disadvantages of squirrel cage induction motor. Generally, it is known as the asynchronous motor because its running speed is less than its synchronous speed. It consists of a cylinder of steel laminations, with aluminum or copper conductors embedded in its surface. The most commonly used is the squirrel cage induction motor. These motors are tested to strict quality control for routine and type tests at every stage of production and are ideally suitable for various. The implementation is done using a rectifier and an inverter, where the pwm triggering pulses were generated by using pic micro controller for switching the igbts of the inverter. Starting and control of threephase asynchronous motors eaton.
This is one of the major diadvantages of squirrel cage induction motors. May 15, 2009 induction motor and squirrel cage motor are two alternative names for exactly the same thing. For reason of economy, most houses, offices and also rural areas are supplied with single phase a. They are simple, rugged, and selfstarting, and maintain a reasonably constant speed from light load to full load, set by the frequency of the power supply and the number of poles of the. Speed control of a squirrel cage induction motor with a balanced capacitor voltage fed multilevel diode clamped converter article pdf available march 2020 with 14 reads how we measure reads. How are squirrel cage induction motors constructed. Fourpole squirrelcage induction motor, cutaway festo. Know how the speed control is easily achieved by changing the number of stator poles. Squirrel cage construction, the rotor winding consists of a number of rotor bars, shortcut by rings from both side, see figure below. A survey of speed and flux control structures of squirrel. Rational systems for the drives of hoisting cranes, roller conveyors, and elevators are solved taking into account specific features of the operation of inductions motors with the squirrelcage rotor in a frequency regulation system. Construction an induction motor with two cage rotor is used for high starting torque.
Also appreciate the rugged construction of squirrel cage rotor and know the spectacular reasons for the skewed arrangements of the rotor conductors. A survey of speed and flux control structures of squirrelcage induction motor drives 7 frequency of the supply voltage. Direct torque and flux control of squirrel cage induction. 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. Squirrel cage induction motor the engineering projects.
Speed control of three phase squirrel cage induction motor using vf method is implemented. Once they are free, the braking pads move axially in. This enables students to better observe the construction of the machine. To drive three phase squirrel cage induction motor with a constant speed, vector control technique is used. In the synchronous reference frame, all variables appear as dc quantities in steady state. Parida department of electrical engineering national institute of technology, silchar. 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. Squirrel cage induction motors menzel squirrel cage induction motors are manufactured for various industries and industrial applications of all kinds 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. Low and high voltage three phase induction motors m line squirrel cage rotor horizontal date. Wem squirrel cage induction motors provide customers a superior value in terms of quality, proven reliability, low maintenance performance and long life in critical services. The reason for the name squirrel cage is because of the type of rotor used in these motors. An induction motor or asynchronous motor is an ac electric motor in which the electric current.
Three phase squirrel cage induction motor with inverter section model 0100hz. The total energy loss during starting of squirrel cage motor is more compared to slip ring motors. You need to select at least 1 product to add in your comparison list. Design of a threephase squirrelcage induction motor based on efficiency maximization using fem software mucet2008paper no here. All space vectors are frozen in space in the shown fixed position based on the assumption that the original stationary and the synchronously rotating reference frames coincide at time t 0. Squirrel cage induction motor and wound rotor induction motor.
Pdf improving squirrel cage induction motor efficiency. The squirrel cage induction motor drive with vector or fieldoriented control offers a high level of dynamics performance and the closed loop control associated with this derive provides the long. Frequency inverter t1, controlled, stepless motor start with ratedload torque. This point is significant if the application involves frequent starting. The design of the basic inverter is covered in chapter 2. Sensored field oriented control of 3phase induction motors.
In operation, the nonrotating stator winding is connected to an alternating current power source. Pdf speed control of a squirrel cage induction motor. The speed of an ac induction motor at full load and. 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.
The speed of a threephase squirrel cage induction motor depends on the frequency of the applied voltage and the number of poles reversing rotation the direction of rotation of a three phase induction motor can be readily reversed. Speed control of squirrel cage induction motor sqim based on voltage angle article pdf available april 2015 with 1,641 reads how we measure reads. Unitv conventional and solid state speed control of ac drives. An induction motors rotor can be either wound type or squirrel cage type. 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. There are two basic reasons for the use of singlephase motors rather than 3phase motors. The slotting arrangement for double cage induction motor is as shown in above figure. Pdf design of a threephase squirrelcage induction motor. Note that cut away machines only include the machine itself i.212 595 541 110 431 129 276 568 687 13 786 524 507 1291 351 445 558 270 401 597 320 370 107 1052 992 1013 1267 150 296 1041 1216 539 547 854 969 1556 73 1378 1396 916 397 1369 148 253 468