Induction machines guru nanak dev engineering college, ludhiana. With the single phase motor, the starting torque is generally smaller than the operating torque, while the three phase motor features a relatively greater starting torque. The stator carries a 3 phase winding called stator winding while the rotor carries a shortcircuited winding called rotor winding only the stator winding is fed from the 3 phase supply. Today we are going to made available a powerpoint presentation file for all. Y2 series 3 phase induction motors are characterized with. This would result in a balanced three phase current. Starting method for induction motors a 3 phase induction motor is theoretically self starting. Although single phase induction motor is more simple in construction and is cheaper than a 3 phase induction motor of the same frame size, it is less efficient and it operates at lower power factor. Handbook vlt frequency converters facts worth knowing. For reason of economy, most houses, offices and also rural areas are supplied with single phase a. A poly phase induction motor consists of two major parts, the stator and rotor.
In a threephase induction machine, alternating current supplied to the stator windings. Construction of three phase induction motor like any electric motor, a 3phase induction motor has a stator and a rotor. Single phase induction motor the engineering projects. Pdf performance study of threephase induction motor driving a load. The same field is utilized by one of the stator windings to work as an induction motor to meet mechanical load while, a three phase emf is induced in the other two sets of windings. If the speeds become equal, there would be no such relative speed, so no emf induced in the rotor, and no current would be flowing, and therefore no torque would be generated. Construction of any part of the motor separately has caused that reader cannot communicate suitably with. Introduction types of electrical machines types of 3ph induction motor basic principle working principle compnents of induction motor application comparision between 1ph i. A single phase induction motor is inherently not selfstaring can be shown easily. Threephase induction motor protection systems and its. The stator frame consists of laminations of silicon steel, usually with a thickness of about 0. These stator and rotors are made up of highmagnetic core materials with less hysteresis and eddy current losses.
Safety information 1 description 2 transport, assembly, and connection 3 startup 4 operation 5 faults 6 maintenance 7 spare parts 8 notes 9 three phase induction motor. The stator copper losses are 2 kw, and the rotor copper losses are 700 w. Electric motor electric motor construction of induction motors. Induction motor totallyenclosed fancooled nema standard epact three phase induction motors sdesign versatility teco totally enclosed fan cooled squirrelcage induction motors are designed, manufactured and tested to meet or exceed the latest nema, ieee, csa and. Rewinding of motors pdf the information in this report and the good practice guide to maintain motor efficiency part 2 was. Motors specification of electric motors marshall wolf automation. A 3 phase induction motor has two main parts i stator and ii rotor.
Apr 07, 2020 ppt three phase induction motor electrical engineering ee notes edurev is made by best teachers of electrical engineering ee. Construction of induction motor the three phase induction motor is a preferable type of motor. Threephase induction motor ac compact drives type 1pl622. Always the stator and rotor is separated with a small air gap ranging from 0.
Differentiate between the various types of generating electric power stations. The single phase induction motor resembles, three phase, squirrelcage motor except that, single phase induction motor has no starting torque and some special arrangement have to be made to make it as self starting. Designing of three phase squirrel cage induction motor for. Learn a brief history of the electrical power systems construction. The induction motor stator resembles the stator of a revolving field, three phase alternator. Watch this video to understand the working principals of the three phase induction motors. Third international conference on advances in control and optimization of dynamical systems march 15, 2014. Ppt threephase induction motor electrical engineering. These are excited by a balanced three phase voltage supply. Applications of three phase induction motors of size varying from half a kilowatt to thousands of kilowatts are numerous. Types and construction of three phase induction motor. Single phase induction motors are used where three phase power is not available.
And in the last sections of this article, i will share some knowledge about the starting problem of a single phase induction motor and give a comparison of 3 phase and single phase induction motors. A linear induction motor lim is a specific type of alternating current ac motor designed to produce motion in a straight line. Be careful it can hurt to tangle with a three phase motor. Three phase induction motor construction your electrical guide. Electric motor construction of induction motors britannica. Herein, a model of 126hp rated threephase induction motor driving step input loads at. Feb 15, 2017 construction of 3 phase induction motor smile and learn. Windingrotor arrangements for 3 phase induction machine three phase slip ring induction motor. The stator or the stationary part consists of three phase winding held in place in the slots of a laminated steel core which is enclosed and supported by a cast iron or a steel frame as shown in. Frequency converters, for variable speed control of threephase induction motors.
The most common type of ac motor being used throughout the work today is the induction motor. Simulink model of three phase induction motor file. Threephase induction motor operating instructions 1ph722. Three phase squirrelcage induction motors are widely used as industrial drives because they are selfstarting, reliable and economical. The threephase induction motor is the extensively used for various kinds of industrial drives. The major difference between them is that transformer is static in nature i.
Advantages of 3 phase induction motor generally easy to build and cheaper than corresponding dc or synchronous motors induction motor is robust. The rotor is separated from the stator by a small airgap which ranges from 0. What is common to all the members of this family is that the basic physical process involved in their operation is the conversion of electromagnetic energy. In this chapter, we shall focus our attention on the construction. In this case, power flows from the mechanical system, to the rotor circuit, then across the air gap to the stator circuit and external electrical system. The performance over a wide range of applications makes three phase induction motors accountable for 85 percent of the installed capacity of the industrial driving systems. In this work a conventional three phase squirrelcage 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. Typical power factor and efficiency of three phase 60 hz nema b induction. Nov 04, 2012 introductionan induction motor im is a type ofasynchronous acmotor where power is supplied to therotating device bymeans ofelectromagneticinduction three phase induction motors 4. A single phase induction motor needs a starter configuration to provide the starting torque while a 3 phase motor can be inherently selfstarting as the different phases can be manipulated to start the rotor moving.
Download 3 phase induction motor powerpoint presentation. This document is highly rated by electrical engineering ee students and has been viewed 2456 times. Assuming that the stator resistance r1 is measured at dc and that phase power. As previously, we have covered a lot of important topics. First of all, i am going to discuss about the construction of 3 phase induction motor and then i will. A wound rotor or slip ring motor has a 3phase winding, similar to the stator winding. The rotor winding terminals are connected to three slip rings which turn with the rotor. There are two types of rotors which are employed in 3 phase induction motor. Equations 1 3 represent the currents that ow in the three phase windings. This paper explores the construction process of a linear induction motor lim, the basic concepts behind key aspects of linear induction machines construction and the testing process of a working. Today, i am going to tell you about a wound rotor induction motor, which is also a type of 3 phase induction motor. This induces an electric field in a coil or squirrel cage to drive a rotor. Wound rotor induction motor the engineering projects. List and describe the more commonly used equipment in an electric substation.
The rotor is a moving component of an electromagnetic system in the electric motor, electric. The conductors are heavy copper or aluminum bars fitted in each slot and shortcircuited by the end rings. Three phase dualvoltage motor insulation resistance testing three phase dualvoltage motors are used for most daytoday operations in todays industrial plants. A 3 phase induction motor can be used for different applications with various speed and load requirements. Pdf construction of three phase linear induction motor. Unit 4 three phase induction motor rajkumar kuppapillai. Fcs are now used in an expanding range of applications, with the following main objectives in mind. What is common to all the members of this family is that the basic physical process involved in their operation is the conversion of electromagnetic energy to mechanical energy, and vice versa. Mostafa elshahed objectives learn a brief history of the electrical power systems construction. Physical layout of induction motor in an induction motor induction refers the field in the rotor is induced by the stator currents and asynchronous refers that the rotor speed is not equal to the stator speed. Applications of threephase induction motors of size varying from half a kilowatt to thousands.
The 3 phase set of currents, each of equal magnitude and with a phase. It is mostly used in industrial drives because it is very reasonable and vigorous, economical and reliable. Nov 27, 2019 thus from the working principle of three phase induction motor, it may be observed that the rotor speed should not reach the synchronous speed produced by the stator. Lamination is necessary since a voltage is induced along the axial length of the steel as well as in the stator conductors. A successful salesman for general electrics motor division once remarked to one of your instructors that, when asked by a customer how a motor. Ac induction motors are also the most common motors used in main powered home appliances. Library site has several downloadable acrobat files on motors and efficiency.
The topic lies under the basic electrical and electronics engineering course that. The stator of an induction motor consists of 3 phase windings, which when connected to a 3 phase supply creates a rotating magnetic field. Threephase dualvoltage motor insulation resistance testing. Thus from the working principle of three phase induction motor, it may be observed that the rotor speed should not reach the synchronous speed produced by the stator. Three phase induction motor consists of a stator and a rotor, and there is no electrical connection between these two. The stator carries a 3phase winding called stator winding while the rotor carries a shortcircuited winding called rotor winding. Single phase induction motors are used extensively for smaller loads, such as household appliances like fans. The video tutorial is essentially a part of the basic electrical and electronics engineering.
Scope regulation eu 42014 covers single speed, three phase, 50 hz and 60 hz induction motors with. Historythe induction motor with a wrapped rotor wasinvented by nikola tesla in 1888 in the unitedstates. Dq based modeling of three phase induction motor is presented in this model. Motors are susceptible to the gradual failure of their insulation resistance. Today fcs are an increasingly important component for optimising motor operation, and the system attached to the motor. A lim operates under the same principles as its ac rotary motor counterpart, typically powered by a three phase voltage scheme with a. An induction motor can therefore be made without electrical connections to the rotor. In my last article, we have discussed squirrel cage induction motor which is a type of 3 phase induction motor. Construction of three phase induction motor electrical4u. Speed torque characteristics of 3 phase induction motor duration.
On this topic, i will explain in details about 3 phase induction motor construction before we talked about parts of the electric motor generally but on this topic, we will go deep for 3 phase induction motor construction only. The three phase induction motors are simple in construction, rugged, low. Internet based speed control and torque analysis of a 3phase. They run at a constant speed from noload to the full load. Squirrel cage induction motor and wound rotor induction motor based on the construction of rotor. An electrical motor is a device that has brought about one of the biggest advancements in the fields of engineering and technology ever since the invention.
Like any electric motor, a 3 phase induction motor has a stator and a rotor. Whenever the motor temperature is equal to and below. Parida department of electrical engineering national institute of technology, silchar,assam, india email. Safety information 1 description 2 transport, assembly, and connection 3 startup 4 operation 5 faults 6 maintenance 7 spare parts 8 notes 9 threephase induction motor. This field produces an emf in the rotor winding by mutual induction principle, which in turn circulates current when the rotor is short circuited.
Therefore, these motors are frequently used in industry. The rotor will constantly be turning to align its magnetic field with that of the stator field. The rotor winding terminals are brought out and attached to the three slips rings with. Nov 27, 2019 the three phase induction motor is the most widely used electrical motor. The basic idea of an electric motor is to generate two magnetic fields. The friction and windage losses are 600 w, the core losses are 1800 w, and the stray losses are negligible. They have very simple and rugged almost unbreakable construction. The three phase induction motor is the most widely used electrical motor. Squirrel cage induction motors a stator construction. Threephase induction motor showing stator, rotor, and schematic representation of yconnected stator winding. Oct 05, 2016 i would discuss advantages of a 3 phase induction motor later in this article. An electric motor is an electrical machine that converts electrical energy into mechanical. A 480v, 60 hz, 50hp, three phase induction motor is drawing 60 a at 0. Kanpur, india design of a three phase squirrel cage induction motor for electric propulsion system ravi prakash,mohammad junaidakhtar, r.
In certain applications, such as in regenerative braking with traction motors, electric motors can be used in. An induction motor s rotor can be either wound type or squirrelcage type. These motors are squirrel and slipring type induction motors. Construction of three phase induction motor consist of 2 important parts namely stator and rotor. Y2 series three phase induction motor i asynchronous motor y2 series three phase asynchronous motor is a kind of totally enclosed fancooled tefc squirrelcage induction motor. A 3 phase induction motor uses current delivered in three phases in a sequence into the coils of a stator to create a rotating magnetic field. These motors run conveyor belts, pumps, fans, and many other applications.
The three phase induction motors are simple in construction, rugged, low cost and easy to maintain. The rotor of three phase induction motor consists of a cylindrical laminated core with parallel slots that can carry conductors. Pdf on may 3, 2019, ahmed m t ibraheem alnaib and others published single phase induction motors find, read and cite all the research you need on researchgate. Construction of three phase induction motor my tech info. It is also called asynchronous motor because it does not run at a synchronous speed.
Types, construction and principle of operation, 3 phase induction motor, general phasor diagram, equivalent circuit, power and torque relations, condition for. An induction motors rotor can be either wound type or squirrelcage type. There are two basic reasons for the use of single phase motors rather than 3 phase motors. An induction motor also known as an asynchronous motor is a commonly used ac electric motor. Lets now take a look on construction of a single phase induction motor.
What are the advantages of a three phase induction motor. The threephase induction is now used for the vast majority of commercial applications. A three phase induction motor runs on a three phase ac supply. Three phase induction motors are further divided into two types.
Power factor control and direct torque control can help to boost the performance of a three phase induction motor drive. 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. A general model of three phase induction motor has been presented and its simulation has been carried out by using subblocks. A wound rotor has a 3phase winding, similar to the one on the. Design of a three phase squirrel cage induction motor for. The design of y2 series induction motor absorbed the advanced technology of electric motors around the world.
The rotor of the squirrel cage three phase induction motor is cylindrical in shape and have slots on. The difference in speed between rotor, the synchronous speed and the rotating. Let us discuss on basic information about this motor and its special controlling technique of svpwm. Theory and analysis of three phase induction motor using. Further, in an induction machine, the windings are not all located in the same. The stator or the stationary part consists of three phase winding held in place in the slots of a laminated steel core which is enclosed and supported by a cast iron or a steel frame as shown in fig. The motor efficiency class and nominal motor efficiency must be stated on the motor nameplate and given in product documentation and motor catalogues.
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