Induction motors are the most commonly used motors in many applications. Single phase and three phase are the two types of an ac induction motor. An induction motor is also called asynchronous motor as it runs at a speed other than the synchronous speed. The threephase induction motor is the extensively used for various kinds of. An induction motors rotor can be either wound type or squirrelcage type. Ppt single phase induction powerpoint presentation free. Generally, two types of induction motors are used in our industry such as wound rotor and squirrel cage rotor, but their faults are almost same. Induction motor 1 chapter 3 induction motor bee23 electrical machine power system 2 learning outcomes.
In split phase induction motor the starting and main current get splitted from each other by some angle so this motor got its name as split phase induction motor. These stator and rotors are made up of highmagnetic core materials with less hysteresis and eddy current losses. Three phase ac motor it has three pairs of electromagnets, connected to one of the three phases of the power supply. Single phase induction motor the single phase induction machine is the most frequently used motor for refrigerators, washing machines, clocks, drills, compressors, pumps, and so forth. The 3phase set of currents, each of equal magnitude and with a phase. An induction motor can therefore be made without electrical connections to the rotor. Mostafa elshahed objectives learn a brief history of the electrical power systems construction.
The rotor winding terminals are connected to three slip rings which turn with the rotor. In this video basic of construction and working principle of 3 phase induction motor is explained with the help of 3d animation. Free download induction motor seminar ppt, pdf report. 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. Squirrel cage induction motor requires significantly less maintenance as it does not contain brushes, commutators, slip rings. Threephase induction motor protection systems and its. 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. One of the most important topic for electrical engineers. The rotor will constantly be turning to align its magnetic field with that of the stator field. Induction motor is an ac electric motor, having a stator and a rotor just like other motors, but the working principle is a little different which would be discussed further. Basically, there are two types of induction motors that depend on the input power. There are three types of basic techniques are apply for the breaking of induction motors such as following. Differentiate between the various types of generating electric power stations.
Nov 22, 2017 breaking means the intentional reduction of speed of the particular motor. Threephase induction motors are the most common and frequently encountered machines in industry it. Starting methods of a single phase induction motor the single phase motor is not self starting and hence needs an auxiliary means or equipment to start the single phase induction motor. As mentioned above that, due to the rotating magnetic field of the stator, the induction motor becomes self starting. The singlephase ac induction motor best fits this description. Three phase induction motors authorstream presentation. Induction motor basics, single phase and three phase. Three phase induction motor faults and their causes. It is logical that the least expensive, lowest maintenance type motor should be used most often. The stator of an induction motor consists of 3 phase windings, which when connected to a 3 phase supply creates a rotating magnetic field.
A free powerpoint ppt presentation displayed as a flash slide show on id. The winding wound on the stator of three phase induction motor is also. Or they can be divided according to type of rotor i squirrel cage motor and ii slip ring motor or wound type. Dec 19, 2015 single phase induction motors are used primarily for domestic and lightindustrial applications where three phase supply is generally not available. The most common type of ac motor being used throughout the work today is the 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. Introduction to induction motor instrumentation and control. Types of electric motors electric motors dc motors other motors h ac motors s unt motor separately excited. Perform an analysis on induction machines which is the most rugged and the most. This final thesis will mostly be dedicated to induction motors but also to synchronous permanent magnet and reluctance motors. For reason of economy, most houses, offices and also rural areas are supplied with single phase a. Ppt induction motor powerpoint presentation free to download. A singlephase motor is a rotating machine that has both main and auxiliary windings and a squirrelcage rotor. These are also called as asynchronous motors, because an induction motor always runs at a speed lower than synchronous speed. 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. This method is normally limited to smaller cage induction motors, because starting current can be as high as eight times the full load current of the motor. Home technical articles 10 different duty types load cycle of a threephase asynchronous motors motor duty load cycle the term duty defines the load cycle to which the machine is subjected, including, if applicable, starting, electric braking, noload and rest deenergized periods, and including their durations and sequence in time.
Feb 15, 2018 a simple explanation of a 3 phase induction motor. It provides a lot higher power that what single phase motor can deliver. The working of the three phase induction motor is based on the principle of electromagnetic induction. Three phase induction motor breaking methods 3 types. As their name suggests, 1 phase ac power supply is extended to single phase induction motor while three phase induction motor is connected to 3 phase ac power supply.
Threephase induction motor singlephase induction motor there are probably more singlephase ac induction motors in use today than the total of all the other types put together. Squirrel cage induction motor slip ring induction motor 2. Windingrotor arrangements for 3 phase induction machine three phase slip ring induction motor. These motors are squirrel and slipring type induction motors. Induction motor electromagnetic induction electric motor. Single phase induction motors are used extensively for smaller loads, such as household appliances like fans. Since here we are talking about maintenance of induction motor, and it is of two types. By far the most commonly used ac motor is the induction motor.
Threephase or polyphase motors are of mainly two types. At the end of the lecture, student should be able to. There are two types of 3 phase induction motors based on the type of construction of rotor. Different types of motors used in electric vehicles. There are two types of rotors which are employed in 3 phase induction motor. An induction motor s rotor can be either wound type or squirrelcage type. They work on the principle of electromagnetic induction. The construction of stator for both the kinds of three phase induction motor remains the same and. As their name suggests, 1 phase ac power supply is extended to single phase induction motor while three phase induction motor is connected to.
As previously, we have covered a lot of important topics. Electrical machines are electromechanical energy converson devices. Synchronous speed means the speed of the rotating magnetic field in the stator. A three phase induction motor runs on a three phase ac supply. Introduction types of electrical machines types of 3ph induction motor basic principle working principle compnents of induction motor application comparision between 1ph i. Download 3 phase induction motor powerpoint presentation. The starting methods of three phase induction motor generally are directonline starting, reducedvoltage starting and soft starter. Rotating flux is only possible when 3 phase voltage or poly phase which is 120 degree apart in time is applied to a three phase winding or poly phase winding 120 degree apart in space. Introduction basic principle types of 3 ph induction motor construction of an i. Sep 27, 2016 at full load power factor of an induction motor ranges from 0. Squirrel cage wound rotor with slip rings the rotating magnetic field. The rotor is separated from the stator by a small airgap which ranges from 0. Slip ring induction motor or wound rotor induction motor or. Depending upon the type of rotor construction used the three phase induction motor are classified as squirrel cage induction motor.
Learn what a three phase induction motor is, how it is constructed, and its working principle. The single phase induction motor is more subtle and less efficient. The rotor composes of concentric strips of magnetic iron isolated from each other. Slip ring induction motor or wound rotor induction motor or phase wound induction motor. Figure 1 three phase induction motor with all their essential parts.
Generally, it is known as the asynchronous motor because its running speed is less than its synchronous speed. Types of single phase induction motors single phase. This is one of the most widely used types of single phase induction motors. Introduction basic principle types of 3ph induction motor construction of an i. Split phase induction motors have low starting current and moderate starting torque. Normally this three phase induction motor breaking methods done by causing the motor to produce the reverse torque. There are two types of induction motors, one is named as single phase induction motor, while the second one is named as 3 phase induction motor. Well, every electrical domain engineering students are aware of 3 phase induction motor. A successful salesman for general electrics motor division once remarked to one of your instructors that, when asked by a customer how a motor. This document is highly rated by electrical engineering ee students and has been viewed 2495 times.
Presentation on 3 phase motor electromagnetic induction machines. Depending upon the type of rotor used the threephase induction motor is classified as. Different types of fault in three phase induction motor. May 19, 2018 there are mainly two types of induction motor on the basis of power supply, single phase induction motor and three phase induction motor. A 3 phase induction motor can be used for different applications with various speed and load requirements. Presentation on 3 phase motor free download as powerpoint. Introduction to induction motor the engineering projects. Be careful it can hurt to tangle with a three phase motor. Jan 28, 2017 in this video i have cover split phase induction motor, capacitor start, capacitor starrun motor and permanent split capacitor motor. Induction motor, working with ac supply, consisting of a rotating magnetic field and stationary rotor find about two types single phase and three phase. There are two different types of the structure and similar in electrical properties. Threephase induction motor ppt download slideplayer. Types of single phase induction motors electronics hub.
These motors are selfstarting and use no capacitor, start winding, centrifugal switch or other starting device. There basically 2 types of induction motor depending upon the type of input supply i single phase induction motor and ii three phase induction motor. A 3 phase induction motor has two main parts i stator and ii rotor. Ppt induction motor powerpoint presentation free to. The 3 phase induction motor is usually called according to the type of its rotor to distinguish between the two types wound rotor type. In this chapter, we shall focus our attention on the construction. Types of electric motors electric motors dc motors other motors h ac motors s unt motor separately excited induction motor stepper motor motor brushlessdc motor series motor hysteresis motor permanent magnet dc pmdc synchronous motor reluctance motor compounded motor universal motor. These are of two types, squirrel cage and slip ring motors. So the main idea behind motor maintenance is to prevent breakdown rather than repairs them.
Ppt threephase induction motor electrical engineering. The three phase induction motor is the easiest motor of this type to understand so these notes start with that type. The magnetic field in the air gap from the voltage applied to the stator. 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. Mechanical methods are impractical and, therefore the motor is started temporarily converting it into two phase motor. How an induction motor works by equations and physics.
Induction motor basics, single phase and three phase induction. When three phase stator winding of an induction motor is energized from a 3 phase supply, a rotating magnetic field is set up which rotates around the stator at synchronous speed n s. It is simple and cheap starter for a 3 phase induction motor. Three phase induction motor consists of a stator and a rotor, and there is no electrical connection between these two. This presentation file is prepared by one of my friend taking help from different sources. Apr 18, 2020 ppt three phase induction motor electrical engineering ee notes edurev is made by best teachers of electrical engineering ee.
Today we are going to made available a powerpoint presentation file for all. A wound rotor or slip ring motor has a 3phase winding, similar to the stator winding. Induction motor seminar ppt, pdf report study mafia. Now lets just take a brief look on types of induction motor.
Three phase squirrelcage induction motors are widely used as industrial drives because they are selfstarting, reliable and economical. Squirrel cage induction motors draw 500% to over % of full load current flc during starting. Starting methods of a single phase induction motor. The squirrel cage motor is mostly started by stardelta stater and hence the stator of squirrel cage motor are delta connected. How to calculate the slip ring induction motor rotor. Supplying of both main and auxiliary windings enables the singlephase machine to be driven as a twophase machine. Three phase ac induction motors are widely used in industrial and commercial applications. Difference is that transformer is an alternating flux machine while induction motor is rotating flux machine. Applications of three phase induction motors of size varying from half a kilowatt to thousands of kilowatts are numerous. Induction motor free download as powerpoint presentation. Introduction to induction motor instrumentation and. The single phase induction motor is not an automatic starter motor that we will discuss later and the three phase induction motor is an automatic starter motor.
Induction motor starting methods brighthub engineering. Understand the principle and the nature of single phase and 3 phase induction machines. The slip ring three phase induction motor are started by inserting resistances so, the stator winding can be connected either in star or delta. While this is not a severe problem for small motors. Directonline starting this kind of starting mode is the most basic and simplest in the motor starting. The basic idea of an electric motor is to generate two magnetic fields. Due to the similarity in the working principle of the transformer, it is also known as the rotating transformer.
The single phase motor stator has a laminated iron core with two windings arranged perpendicularly. Synchronous motor s are special types of motors used in constant speed applications, whereas most of the motors used in the industrial applications are of induction type. There are two basic reasons for the use of single phase motors rather than 3 phase motors. There are two types of induction motors, one with wound type rotor, also called slipring motor and another one with squirrelcage rotor. Starting method for induction motors a 3 phase induction motor is theoretically self starting. There basically 2 types of induction motor depending upon the type. Historythe induction motor with a wrapped rotor wasinvented by nikola tesla in 1888 in the unitedstates. Many squirrel cage induction machines are driven by various types of prime movers as induction generators. In a dc motor, supply is needed to be given for the stator winding as well as the rotor winding. The method is characterized by less investment, simple equipment and small quantity. The three phase induction motors are the most widely used electric motors in the industry.
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