Designing of three phase squirrel cage induction motor for. A simple explanation of how a 3 phase induction motor works. Induction motor teco pdf book manual free download. The construction of stator for any induction motor is almost the same. The construction of this type of rotor along with windings resembles a squirrel cage. The figure itself depicts many difference between the two types of motors. Three phase induction motor construction electrical academia. An induction motor can therefore be made without electrical connections to the rotor. Those induction motors which employ squirrel cage rotor are called squirrel cage induction motors. Design and fabrication of high efficiency squirrel cage induction motor using. This paper deals with analysis of high speed squirrel cage induction motor. Pdf squirrel cage rotor design and manufacturing for. The torque of the induction motor depends on the rotor resistance. Menzel squirrel cage motors are available in all standard motor cooling and protection types for lowvoltage from 75 kw as.
Also appreciate the rugged construction of squirrel cage rotor and know the spectacular reasons for the skewed arrangements of the rotor conductors. Construction of induction motor electrical edition. The rotor consists of a cylindrical laminated core with parallel slots for carrying the rotor conductors which, it should be noted clearly, are not wires but consist of. Parida department of electrical engineering national institute of technology, silchar,assam, india email. Induction motor basics, single phase and three phase. The rotor is wound for the same number of poles and number of phase. These motors can operate at any working conditions.
The rotor consists of a cylindrical lamina ted core with parallel slots for carrying the rotor conductors which, it should be. A 3 phase induction motor has two main parts i stator and ii rotor. A squirrelcage rotor is the rotating part of the common squirrel cage induction motor. The stator of an induction motor is laminated iron core with slots similar to a stator of a synchronous machine. Pdf squirrel cage rotor design and manufacturing for high. This rotor consists of uninsulated copper or aluminium bars, placed in the slots. Depending upon the type of rotor construction used the three phase induction motor are classified as.
Motor, 3 phase induction motor construction, induction motor construction, working ppt, induction motor construction video, induction motor construction and working pdf. Nov 27, 2019 the three phase induction motor is the most widely used electrical motor. Advantages and disadvantages of squirrel cage induction motor. Control of motorcharacteristics by squirrelcage rotordesign. Introduction to induction motor instrumentation and. Slip ring induction motor is made up from wound rotor and squirrel cage induction motor is made up from the squirrel cage rotor. The rotor is constructed using a number of single bars shortcircuited by end rings and arranged in a hamsterwheel or squirrel cage configuration.
Cheap copare to slipring im maintainance is easy cost is less compare to slipring im can use at explosive area starting torque is low compare to slip. These motors are having the difference in rotor construction. I g crow beng, phd, ceng, fimeche, fimare, memasme, r robinson bsc, ceng, fiee, in plant engineers reference book second edition, 2002. The majority of commercial and industrial applications usually involve the use of a threephase squirrel cage induction motor. The absence of a centrifugal switch eliminates the possibility of motor failure due to faulty centrifugal switch mechanisms. Ppt threephase induction motor electrical engineering. Construction of induction motor posted by electrical. It provides knowledge for industrial engineers, who use motor current signature analysis mcsa to determine if there are any cage winding breaks in their squirrel cage induction motors scims. It provides knowledge for industrial engineers, who use motor c. Modelling and analysis of squirrel cage induction motor with. Introduction this manual provides information on how to safely install, couple to the driven equipment, and maintain the toshiba squirrel cage mediumvoltage induction motor. How are squirrel cage induction motors constructed. Also lets get to know the methods which are used to control the speed of squirrel cage.
The linear induction motor has been proposed as a drive for highspeed passenger trains. The squirrel cage induction motor is by far the most common type of induction motor. Introduction to induction motor instrumentation and control. There are two types of induction motors, one with wound type rotor, also called slipring motor and another one with squirrel cage rotor. It is very commonly used in industries because it is very cheap, robust, efficient, and reliable.
Threephase ac induction motors are widely used in industrial and commercial applications. Know about the different winding slots, lamination of the stator and its construction. Most of single phase induction motors use squirrel cage rotor as it has a remarkably simple and robust construction enabling it to operate in the most adverse circumstances. These stampings consists of slots on its periphery to carry the. A 1phase induction motor is similar to a 3phase squirrel cage induction motor in. Oct 19, 20 three phase squirrel cage induction motor with inverter section model 0100hz. The construction of these motors is more or less similar to a threephase squirrel cage induction motor. Difference between squirrel cage and slip ring induction motor. Squirrel cage induction motor an overview sciencedirect topics. A 3 phase squirrel cage induction motor is a type of three phase induction motor which functions based on the principle of electromagnetism. 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 25,000 kw. The ac induction motor comprises two electromagnetic parts. Oct 10, 2016 after that, i will tell you some of the key features and uses of wound rotor induction motor. Know how the speed control is easily achieved by changing the number of stator poles.
Squirrel cage induction motor the engineering projects. Induction motors are used in applications requiring fast and precise control of. Third international conference on advances in control and optimization of dynamical systems march 15, 2014. The rotor is separated from the stator by a small airgap which ranges from 0.
However, it suffers from the disadvantage of a low starting torque. Squirrel cage induction motors are more sensitive to the supply voltage fluctuations. Closedform analysis of squirrelcage induction motors with. These motors are selfstarting and use no capacitor, start winding, centrifugal switch or other starting device.
Stator winding spreading the coil in this manner creates a sinusoidal flux distribution per pole, which improves performance and makes the motor less noisy sound and electrically. Motors employing this type of rotor are known as squirrel cage induction motors. Basically, it is the construction of rotor which makes squirrel cage. 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.
This site is like a library, you could find million book here by using search box in the header. This rotor is a cylinder of steel laminations, with highly. 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. A squirrel cage motor has a very good speed regulation and it is used in places where the load is varying. Induction motor construction squirrel cage rotor duration. The threephase squirrel cage induction motor can, and many times does, have the same armature stator winding as the threephase synchronous motor.
All questions related to transistor will be clear here by blogs. Squirrel cage induction motor and wound rotor induction motor. Analysis and design of ac induction motors with squirrel cage rotors. Please have a look at the below figures of squirrel cage induction and wound rotor slip ring induction motor. Telecommunication engineering, southwest jiaotong university, china, 2005 thesis submitted for the degree of masters of engineering science in school of electrical and electronic engineering the university of adelaide, australia august 2010. The main difference between slip ring and squirrel cage induction motor is the rotor construction. The 3phase set of currents, each of equal magnitude and with a phase. As in the synchronous motor, applying threephase currents to the armature creates a synchronously rotating magnetic field. Most of three phase induction motor use squirrel cage rotor as it has a remarkably simple and robust construction enabling it to operate in the most adverse circumstances. Concept of rotating magnetic field, operating principle, construction, classification and types singlephase, threephase, squirrel cage, slipring, double cage types. A highspeed squirrel cage induction machine requires totally different design compared to the traditional squirrel cage industrial motor because of mechanical limitations caused by. Diagnostics of rotor and stator problems in industrial.
The rotor will constantly be turning to align its magnetic field with that of the stator field. The internal design and construction of both are not discussed you can simply read them from your theory books. Construction of squirrel cage induction motor explained. The rotor is built of a stack of steel laminations, such as the one shown in figure 3. The induction motor rotor is a completely shortcircuited conductive cage. Tesla polyphase induction motors ac motors electronics. Wound rotor induction motor the engineering projects.
Squirrel cage induction motors menzel elektromotoren. Double squirrel cage motor we have already discussed that the rotor which is of squirrel cage type has two end rings, which are permanently shorted with the rotor conductors. The slip ring motor has very little application in industries. 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.
Starting torque is directly proportional to the rotor resistance. Squirrel cage rotor consists of a set of copper or aluminium bars installed into the slots, which are connected to an endring at each end of the rotor. Phasor diagram of induction motor on noload and loaded conditions, visualization of a threephase induction. Squirrel cage induction motor a squirrelcage induction motor is one in which the secondary circuit consists of a squirrelcage winding suitably disposed in slots in the secondary core. When the supply voltage is reduced, induction motor draws more current. Know about the construction of double squirrel cage motor with a graphical comparison with single cage. References 16 stator winding is placed in the stator of induction motor and the three phase 1. Diagnostics of rotor and stator problems in industrial induction motors by fang duan b.
This explains single phase induction motors working principle and construction. In first comparison, motor was supplied from laboratory source. This document is highly rated by electrical engineering ee students and has been viewed 2495 times. The ruggedness and simplicity of the squirrel cage induction motor usually makes it the first choice for a driver. A 3 phase induction motor can be used for different applications with various speed and load requirements.
Kanpur, india design of a three phase squirrel cage induction motor for electric propulsion system ravi prakash,mohammad junaidakhtar, r. The stator is a stationary part and it has laminated construction, which is made up of stampings. Design of a three phase squirrel cage induction motor for. What are the advantages of a squirrelcage induction motor. The construction of a stator for both of the kinds of three phase induction motors is identifcal, and is discussed briefly below. Slip ring induction motor or wound induction motor or phase wound induction motor. 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. A squirrelcage induction motor is one in which the secondary circuit consists of a. Construction of three phase induction motor electrical4u. It is usually designed for fixedspeed operation, larger ratings having such features as deep rotor bars to limit direct on line dol. We also discuss the construction of a three phase motor. Most of the application of industrial as well as domestic are this type of induction motor. Three phase squire cage induction motor, fully enclosed. Stator of this motor is the same as the one used in squirrel cage induction motors.
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 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. Basic construction of 3phase ac induction motors you should. Parida department of electrical engineering national institute of technology, silchar. Squirrel cage induction motor an overview sciencedirect.
Squirrel cage induction motortable of contents1 squirrel cage induction motor2 slip ring or wound induction motor3 advantages of squirrel cage induction motor4 advantages of slip ring induction motor5 disadvantages of squirrel cage induction. Dont worry, difference between squirrel cage and slip ring type induction motor is tabulated after the figure. Pdf principles of electrical machines book by vk mehta. Starting of squirrel cage induction motors485 an induction motor can be regarded as a transformer with a small air gap in the magnetic circuit. The basic idea of an electric motor is to generate two magnetic fields. Squirrel cage induction motors are cheaper in cost compared to slip ring induction motors. The construction of stator of the induction motor is almost the same as other motors. Menzel squirrel cage induction motors are manufactured for various industries and industrial applications of all kinds. When a 3 phase supply is given to the stator winding it sets up a rotating magnetic field in space. Pdf design and fabrication of high efficiency squirrel cage.
The direction of linear travel is controlled by the sequence of the drive to the stator phases. A 3 phase induction motor has two types based on the rotor construction, named as. Know about the most popular and almost unbreakable construction of squirrel cage induction motor. The singlephase induction motor is not selfstarting. This final thesis will mostly be dedicated to induction motors but also to synchronous permanent magnet and reluctance motors. Although single phase induction motor is more simple in construction and is cheaper than a 3phase induction motor of the same frame size, it is less efficient and it operates at. The below diagram shows squirrel cage induction rotor having aluminum bars short circuit by aluminum end rings. Coils are placed in the slots to form a three or single phase winding. Recall that leakage reactance is the reactance due to the rotor flux lines that do not also couple with the stator windings. Types of single phase induction motors electronics hub. The principal advantages of the squirrel cage induction motor are its simplicity of design and robust construction. Basic construction and operating principle like most motors, an ac induction motor has a fixed. Apr 18, 2020 ppt threephase induction motor electrical engineering ee notes edurev is made by best teachers of electrical engineering ee. Types of ac induction motor rotors there are twotypes of rotor windings.
In operation, the nonrotating stator winding is connected to an alternating current power source. It is called a squirrel cage motor because the rotor inside of it known as a squirrel cage rotor looks like a squirrel cage. Horizontal squirrel cage mediumvoltage induction motor. A highspeed squirrel cage induction machine requires totally different design compared to the traditional squirrel cage industrial motor because of mechanical limitations caused by the high speed. The wound stator and the squirrel cage rotor of an induction motor may be cut at the circumference and unrolled into a linear induction motor. The induction motor is mod eled as six concentric cylindrical layers representing the different construction components of the motor. 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.
Design, construction, and manufacture of squirrel cage rotors. This simplest form of ac induction motor or asynchronous motor is the basic, universal workhorse of industry. Test motor was tested on bench to experimentally verify the results. An induction motor always operates at a speed lower than the synchronous speed because the rotating magnetic field that occurs in the stator will generate flux in the rotor that will cause the rotor to rotate, but due to the delay of the flow current in the rotor with current flow in the stator, the rotor will never reach its rotating magnetic field speed, that is, the synchronous speed. Former is cheaper and broadly used as it requires less maintenance than later one. Normally, we use the motors in industrial drives because they are rugged, reliable and economical. A squirrel cage induction motor therefore draws a very high starting. Dec 19, 2015 single phase induction motors consist of two main parts. The laminations are aligned and heatshrunk onto the shaft, and then the molten aluminum is forced into the slots to form the squirrel cage winding. The rotor of a squirrel cage induction motor is shor.
Learn a brief history of the electrical power systems construction. This chapter presents the essential features of the design, construction, and manufacture of squirrel cage induction rotors. An induction motor s rotor can be either wound type or squirrel cage. Pdf principles of electrical machines book by vk mehta and rohit mehta pdf download. Control of motorcharacteristics by squirrelcage rotordesign the reactance x2 in an induction motor equivalent circuit represents the referred form of the rotors leakage reactance. Basics of induction motors basics of electrical engineering. But the rotor construction differs with respect to the type of motor. These are of two types, squirrel cage and slip ring motors. Squirrel cage motors are the most commonly used induction motors, but the main drawback in them is their poor starting torque due to low rotor resistance. Bsc, ceng, fiee, in plant engineers reference book second edition, 2002. A squirrel cage rotor is the rotating part of the common squirrel cage induction motor.
Unlike a 3phase induction motor, a singlephase induction motor is not self. The principle of working of squirrel cage and slip ring induction motor is based on faradays law of electromagnetic induction. Current signature analysis mcsa to determine if there are any cage winding breaks in their squirrel cage induction motors scims. Design, construction, and manufacture of squirrel cage. However, should the motor require service, this manual includes a section that assists the. Pdf three phase squirrel cage induction motor, conctruction. Stator is also provided with a starting winding which is used only for starting purpose. As in other induction motors, the basic parts are stator and rotor. Construction of a single phase induction motor is similar to the construction of three phase induction motor having squirrel cage rotor, except that the stator is wound for single phase supply. All books are in clear copy here, and all files are secure so dont worry about it. But the rotor construction differs with respect to the type which is specified above.
The winding arrangement of a symmetrical induction machine is shown in figure 2. Squirrel cage wound rotor with slip rings the rotating magnetic field the basic idea of an electric motor is to generate two magnetic fields. Read online induction motor teco book pdf free download link book now. Almost 90% of induction motors have squirrel cage rotors. Some of the advantages, disadvantages and applications of squirrel cage induction motor compared with slipring induction motor are discussed below. Squirrel cage induction motor is used in lathes, drilling machine, fan, blower printing machines etc slip ring or wound rotor.
Firstly, i am going to tell you about the structure of squirrel cage induction motor. Working principle of 3 phase squirrel cage induction motor. The squirrel cage induction motor was designed for an extended service life under very demanding conditions. With scalar control, the induction motor presently rivals permanent magnet motors in many industrial applications such as pumps, compressors, and conveyor belts. By far the most commonly used ac motor is the induction motor. An 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. These motors have the advantage of adapting any number of pole pairs. During voltage surges, increase in voltage saturates the magnetic components of the squirrel cage induction motor. It consists of a cylinder of steel laminations, with aluminum or copper conductors embedded in its surface. What are the specific applications of squirrel cage and. These motors fill most generalpurpose, constantspeed drive requirements.
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