For example, for 1800 rpm synchronous speed, an induction motor might have a fullload speed of 1748 rpm. The singlephase ac induction motor best fits this description. How does a threephase alternating current induction motor work. The most commonly used is the squirrel cage induction motor. An induction motor s speed is always less than synchronous speed and it drops off as load increases. Feb 28, 2017 type of single phase induction motor 1. In all singlephase induction motors, the rotor is the squirrel cage type. Advantages of 3 phase induction motor generally easy to build and cheaper than corresponding dc or synchronous motors induction motor is robust. These types of motors are known as selfstarting induction motors. The threephase induction motor is the extensively used for various kinds of industrial drives. Lecture 6 three phase induction motors cairo university. In this type of three phase induction motor the rotor is wound for the same number of poles as that of stator but it has less. The types of induction motor depend upon the input supply. The stator is supplied by a balanced 3phase ac power source.
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. The control strategies explored include expertsystembased acceleration control, hybridfuzzypi twostage control, neuralnetworkbased direct self control, and genetic algorithm based. Induction motor magnetic circuit showing stator and rotor slots. Single phase motors are used for smaller loads while 3 phase motors are used in high load applications. The singlephase induction motor is not selfstarting. The rotor of an induction motor can be a squirrel cage rotor or wound type. A induction machine can be used as either a induction generator or a induction motor. Ac induction motors are also the most common motors used in main powered home appliances.
By far the most commonly used ac motor is the induction motor. Construction of squirrel cage induction motor explained. The most popular type is the 3phase, squirrelcage ac induction motor. Find out here with this article on induction motors. Chans research interests are selfexcited induction generators, brushless ac generators, permanentmagnet machines, finite element analysis of electric machines, and electric motor drives control. The products are appointed as the sole product by following famous objects, such as shanghai subway, chongqing expressway, yunnan express way tunnel, badaling tunnelthe. This final thesis will mostly be dedicated to induction motors but also to synchronous permanent magnet and reluctance motors. Squirrel cage wound rotor with slip rings the rotating magnetic field. Perform an analysis on induction machines which is the most rugged and the most widely used. Based on the rotor construction, 3 phase induction motor can be of two types. A stator winding is placed in the stator of induction motor and the three phase supply is given to it. Most of the application of industrial as well as domestic are this type of induction motor.
There are mainly two types of induction motor on the basis of power supply, single phase induction motor and three phase induction motor. Induction motor seminar ppt, pdf report study mafia. It is mostly used in industrial drives because it is very reasonable and vigorous, economical and reliable. The three phase induction motors are simple in construction, rugged, low cost. The three phase induction motor is the most widely used electrical motor. Im transform electrical energy into mechanical energy.
The basic idea of an electric motor is to generate two magnetic fields. Scroll to the bottom to watch the youtube tutorial on this article the induction motor is the most common type of electrical motor used in industry, and its used in pretty much everything, from elevators. An induction motor is the most modest electrical machine from constructional point of view, in the majority of the cases. It is also called asynchronous motor because it does not run at a synchronous speed. Learn all about induction motors including the working principle of an induction. An induction motors speed is always less than synchronous speed and it drops off as load increases. Understanding motor nameplate information nema vs iec. It is a maintenance free, less noisy and efficient motor. Objective polyphase induction motors questions and answers pdf. In the induction motors used in lift and hoists, you will see a type of rotor called a slip ring.
Generally, it is known as the asynchronous motor because its running speed is less than its synchronous speed. An induction motor can therefore be made without electrical connections to the rotor. Objective polyphase induction motors questions and answers pdf 71. At the end of the lecture, student should be able to.
Induction motor theory quiz electrician practice tests. Protection of induction motor relay fuse electrical. Single phase induction motors multiple choice questions. As the name suggests, this type of motor has only one stator winding main winding and operates with a singlephase power supply. Enter your email below to receive free informative articles on electrical.
Motor speed relationship the synchronous speed of an ac motor is the speed of the rotating magnetic field set up by the stator winding synchronous speed rpm 120 x frequency divided by the number of poles. In general, the induction motor is cheaper and easier to maintain compared to other alternatives. Single phase induction motors arenot a selfstarting motor, and three phase induction motor are a selfstarting motor. Nov 27, 2019 like any other type of electrical motor induction motor, a 3 phase induction motor is constructed from two main parts, namely the rotor and stator. In that apparatus, mechanical rotation is obtained from mechanical rotation, therefore it is a kind of rotating induction clutch. In a split phase motor, the running winding should have a high resistance and low inductance. Applications of threephase induction motors of size varying from half a kilowatt to thousands of kilowatts are numerous.
Construction of three phase induction motor electrical4u. Introduction to induction motor instrumentation and. Im is a type of asynchronous ac motor where power is supplied to the rotating device by means of electromagnetic induction. You should also make a dc measurement of stator winding linetoline resistance using a dmm. 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. An887, ac induction motor fundamentals microchip technology. Y2 series 3phase induction motors are characterized with high efficiency and. Squirrel cage induction motor is used in lathes, drilling machine, fan, blower printing machines etc. Understand the principle and the nature of single phase and 3 phase induction machines. Induction machines are by far the most common type of motor used in industrial, commercial or residential settings. Single phase and three phase are the two types of an ac induction motor.
A motor with only armortisseur windings is called an induction motor. Nov 03, 2019 an induction motor also known as an asynchronous motor is a commonly used ac electric motor. Free online electrician practice test questions on induction motor theory quiz leave a reply cancel reply. Induction motor theory jerry bednarczyk, pe course content introduction the ac induction motor is well suited to applications requiring constant speed operation. Protection of induction motor free download as powerpoint presentation. Overall view and cross section of an asynchronous motor. It was invented by the scientist tesla who earlier conducted several experiments on the working of the alternating current systems. By default, the block sets the simulation type parameter to continuous to use a continuous sample time during simulation. Shaded pole induction motor three phase induction motor 1. Sep 27, 2016 according to the type of rotor, an induction motor is divided into two types.
Y2 series three phase asynchronous motor is a kind of totally enclosed fancooled tefc squirrelcage induction motor. In a split phase motor, the running winding should have a high resistance and low inductance b low resistance and high inductance c high resistance as well as high inductance d low resistance as well as low inductiance ans. On standard induction motors, the fullload speed is typically 96% to 99% of the noload speed. In an induction motor, the electric current in the rotor needed to produce torque is obtained via electromagnetic induction. As this is a grundfos publication, it is only natural that we should pay special attention to motors used for pumps although much of the information contained within these pages. The rotor will constantly be turning to align its magnetic field with that of the stator field. A threephase ac induction motor is the only type where the rotating magnetic field is created naturally in the stator because of the nature of the supply. The singlephase induction motor is the most frequently used motor for refrigerators, washing machines, clocks, drills, compressors, pumps, and so forth. There are single phase induction motors and three phase induction motors. Jan 25, 2011 the book presents a practical computer simulation model of the induction motor that could be used for studying various induction motor drive operations. The design of y2 series induction motor absorbed the advanced technology of electric motors around the world.
In this type of three phase induction motor the rotor is wound for the same number of. Single phase induction motors multiple choice questions and answers pdf free download,interview questions,objective type questions,lab viva manual. The block uses the threephase input voltages to regulate the individual phase currents, allowing control of the motor torque or speed. There are two types of induction motors, one with wound type rotor, also called slipring motor and another one with squirrelcage rotor. This is the basic principle followed by all these types of single phase induction motors.
The book explores most of the widely used modern types of motors and drives. The rotor of an induction motor can be a squirrel cage rotor or wound. A simple explanation of how a 3 phase induction motor works. 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.
Induction motor works on the principle of induction where electromagnetic field is induced into the rotor when rotating magnetic field of stator cuts the stationary rotor. As its name indicates stator is a stationary part of induction motor. Types of ac induction motor rotors there are twotypes of rotor windings. It may be said that the predecessor of the induction motor is the baileys. Concluding, advantage of induction motor is its simple operation, reliability and low cost. Applied intelligent control of induction motor drives wiley. Free download induction motor seminar ppt, pdf report. Most widely used motor in the electrical field is induction motor. The stator is the outer most component in the motor which can be seen.
An induction motor also known as an asynchronous motor is a commonly used ac electric motor. The construction of stator for any induction motor is almost the same. The 3phase set of currents, each of equal magnitude and with a phase. 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.
Model number m800006 outline dimension drawing see figure 4 nameplate data 1 see figure 5 rated frequency 50 hz motor location indoor altitude less than meters relative humidity less than 90% ambient temp 40 degrees c max duty type continuous weight approx. Induction motor basics, single phase and three phase. The motor is mounted in a test rig that allows one to control the torque applied to the motor shaft and to measure both rpm and torque. The induction motor block implements a threephase induction motor. According to the type of rotor, an induction motor is divided into two types. Induction motor 1 chapter 3 induction motor bee23 electrical machine power system 2 learning outcomes. Record all nameplate information for the induction motor. Tzefun chan is an associate professor of electrical engineering at the hong kong polytechnic university, where he has been working for over 30 years since 1978.
Applied intelligent control of induction motor drives. May 22, 2017 types induction motor single phase induction motor 1. Single phase magnetic induction motor with exposed rotor and coil after all, motors are always designed to carry out specific tasks. The induction motor is made up of the stator, or stationary windings, and the rotor. This is one of the most widely used types of single phase 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. 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. The most common type of ac motor being used throughout the work today is the induction motor.
Electric motor induction motor sychronous motor 3 phase electric motor ac motor d1cs series electric motor are widely used in manufacturing, sources and architecture. Construction of induction motor the three phase induction motor is a preferable type of motor. Types of single phase induction motors electronics hub. Introduction to induction motor the engineering projects.
But the rotor construction differs with respect to the type which is specified above. They are found everywhere from a small workshop to a large manufacturing industry. The rotor of an induction motor can be a squirrel cage rotor or wound type rotor. Once the motor picks up the speed, this additional winding is removed from the supply. An induction motors rotor can be either wound type or squirrelcage type. Induction motor is a machine that simply operates on the induction type principle. Squirrel cage wound rotor with slip rings the rotating magnetic field the basic idea of an electric motor is to generate two magnetic fields. Types induction motor single phase induction motor 1. Induction motor fault heading fault causes remedies induction motor a no supply voltage b driven equipment jam c motor shaft jammed.
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