The basic constructional features of a DC generator are described below. DC Machine is most often used for a motor. A DC generator consists of several components that help the whole machine to function as it should. Cross-section of DC Machine 1. It converts electrical energy to mechanical while working as a motor and the mechanical energy to electrical energy while working as the generator. If the load current is OB, drop in the machine is AB i.e. Describe exciter generators within alternators; discuss construction and purpose. Construction of DC GENERATOR. The purpose of armature is to house the winding and to rotate the conductors in the uniform magnetic field. Want to read all 17 pages. But the two essential parts of this device are the stator as well as the rotor. This motor can consist of basic parts such as field windings (stator), a commutator, and an armature (rotor). Working of an AC Electric Generator Let's look at the working of an AC Electric Generator Suppose axle is rotated clockwise, so coil is also rotated clockwise, Side AB of Coil moves up and side CD Moves down Applying Fleming's Right Hand Rule on side AB, force is upwards, magnetic field is left to right, So, current flows into the paper i.e. Both DC and AC generators convert mechanical power to electrical power. Fig. 6 Faradays laws construction is simple and costs are less. Hence, a unidirectional current is obtained in the DC generator. In a DC generator, the coil through which the current flows rotate in a fixed field. Ugly hmrry, jolne wodeod` mde pknl sgkls mrl jmstldle, Sknl sgkls slrvl twk purpksls2 (o) tgly suppkrt jolne hkons mde (oo) sprlme kut tgl jnux od mor `mp. These poles are also laminated to minimize the eddy current losses. 1: Parts of DC Generator. That is why they are commonly known as DC machine. Electricity generated at all the power plants is alternating i.e., ac, in order to generate direct current i.e., dc, a commutator is used to convert the generated ac supply into dc supply. This current flows externally from brush B2 to B1 powering the load on its way. Copyright 2021 eTechnophiles. i.e. Now we want you to get more acquainted with its construction. The topic of learning is a part of the Basic Electrical and Electronics Engineering course that aims at. An AC generator is a device that converts mechanical energy into alternating electrical energy for appropriate use. It not only provides mechanical strength to the whole assembly but also carries the magnetic flux produced by the field winding. About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features Press Copyright Contact us Creators . Armature core and Laminations 5. Construction of a DC Generator Here is the schematic diagram of a DC Generator A DC generator consists of six main parts, which are as follows Yoke The outer frame of a DC generator is a hollow cylinder made up of cast steel or rolled steel is known as yoke. 16. This is helpful for users who are preparing for their exams, interviews, or professionals who would like to brush up their fundamentals on the DC generator topic which is core in Electrical Engineering. endobj Electric generators are made on the principle . Pole -Carry the field winding -Rectangle cross . DC generators supply continuous power to electric storage instruments and power grids (DC). The yoke serves following two purposes 7. A DC generator . |s\Zf ;d\*6i_ There are two types of generators- DC generators and AC generators. Stator After 180 degrees rotation of the coil, the conductor CD comes close to the North Pole while AB is near to the South Pole. The permanent magnet DC generator has the advantages of small size, low loss and high efficiency. Parts of DC Generator 1. After applying the above rule to the conductor AB, the direction of the induced current is from A to B in the loop ABCD. This type of rotor consists of a large number of projected poles (called salient poles), bolted on a magnetic wheel. 2. In this type, the field winding is excited by the current supplied by the generator itself. Suppose we are given the internal characteristic of the generator. Ugl mikvl jo`url sgkws tgl hkdstruhtokdmn eltmons kj m soapnl, amhgodl hkdsosts twk imsoh pmrts2 stmtkr mde rktkr. So, a DC generator can work as a DC motor and vice-versa. CONSTRUCTION: Cross Sectional View of DC Generator Above figure shows the constructional details of a simple 4-pole DC generator. In a DC generator, the coil through which the current flows rotates in a fixed field. Basic constructional parts of a DC machine are described below. Construction of DC generator and DC motor is the same. oQcmEbm-x(S{;`X;mbj. A DC generator produces direct power, while an AC generator produces alternating power. Practical Explanation, CR1620 Equivalent, Voltage, Size, Uses & Life, LR41 Equivalent, Voltage, Size, Uses & Life, OBD2 Connector Pinout, Types & Codes(Explained), Top 8 Electric Car Battery Manufacturers (CATL, LEGS,& more). #1. DC Generator_construction.pdf - DC Generator Construction Mole Shahadat Hossain Lipu Assistant Professor Department of EEE University of Asia. 12. It is made up of cast iron or steel. Yoke. List the types of armatures used in dc generators. A simple DC generator consists of a coil of insulated copper wire. CONSTRUCTION OF DC MACHINE D.N.DEVANI (ELECTRICAL) POLE AND FIELD WINDING Poles are made by silicon steel to reduce hysteresis loss. It states that whenever a conductor cuts magnetic flux, an EMF (Electromotive Force) is induced across the conductor. The pole core supports the field winding while the pole shoe distributes the flux in the air gap uniformly. A DC generator whose field winding or coil is energised by a separate or external DC source is called a separately excited DC Generator. DC generators AC Generators: These are also called as alternators. These slots carry the current-carrying armature conductors. DC generators produce electrical power based on the principle of faraday's law of electromagnetic induction. Figure (1.2) Fleming's Right-hand rule. 1 of 20 DC GENERATOR Oct. 13, 2016 102 likes 45,918 views Download Now Download to read offline Engineering This Presentation can be used by the Students of Engineering who Deals with the Subject ELECTRICAL MACHINES and use it for Refrence (Anyways you Guys will Copy Paste or Download it) ;) Ketan Nayak Follow View EEE 205 [Operation Construction of DC Generator].pdf from EEE 205 at United International University. Field poles and Field windings: Muniracademy, Armature parts of DC Generator: Graschopp, |DC Motor Working Principle, Construction and Diagram Explanation. It is also laminated to reduce eddy current loss. The cross-section of a DC machine is shown in the figure below. Hence, it is known as electromechanical energy conversion device. The input supply of AC Generator is mechanical energy which is supplied through some prime-mover and the output is alternating energy in the form of alternating voltage & current. In this article, We will study the basic construction and operation of a DC generator. Poles. Commutator 7. Ra+Rse. The source of mechanical energy may be a reciprocating or turbine steam engine, water falling through a turbine or waterwheel, an internal combustion engine, a wind turbine, a hand . In the construction of DC generator, armature core is designed as the rotating part and is built in cylindrical or drum shape with slots on its outer periphery. Flag question: Question 2 Question 2 10pts A magnetic field is caused by a _______ electric charge. CONSTRUCTION OF DC GENERATOR DC Generator consist of a few part, which is : 1. View DC Generator_construction.pdf from EEE 207 at The University of Asia Pacific. Yoke: The outer frame of a dc machine is called as yoke. The construction of a 4-pole DC generator is shown below. DC Motor/Generator module to demonstrate and explain the operation of dc motors and generators Operating principle of dc motors As stated in Unit 1, motors turn because of the interaction between two magnetic fields. A generator (or an electric generator) is a device used for generating electrical power by converting mechanical energy (motive power) into electrical energy for use in an electric circuit. These generators are most suitable for off-grid applications. ;w>%iO *n;h %r(ee)9ys}"_`*@{?5DV="Z\]F9QDr The yoke is the outer covering of the DC generator and is made of cast steel or cast iron. It connects the rotating armature conductors to the stationary external circuit through brushes. (Image will be Uploaded soon) DC Generator consists of the following parts - So in general DC motor can also be used as a DC generator. There are two types of DC machines; one is DC generator, and another one is known as DC motor. Slip rings are used in AC generators to produce alternating current, while direct current is used in DC generators. Cutaway view of a dc motor DC motors are found in many special industrial environments Motors drive many types of loads from fans and pumps to presses and conveyors The major advantages of dc machines over generators are easy to % Their main function is to collect current from the commutator and supply it to the electrical load or external circuit. It provides an electrical connection between the rotating armature coil and the stationary external circuit. So, a DC generator can work as a DC motor and vice-versa. Your email address will not be published. Basic Design. If you give mechanical input and it generate electrical output and known as DC generator. They always slide over the commutator, thus ensuring a proper electrical connection. If you give electrical input then it will give mechanical output. Generator The d.c. generators and d.c. motors have the same general construction. Construction of a DC Generator: In the previous section, we explain what a DC generator is in a nutshell. It is made up of cast iron or steel. Course Hero is not sponsored or endorsed by any college or university. endobj gV (1.4) Output waveforms of a DC generator. 2. Field system 4. -Yoke is an iron body which provide the part for flux and mechanical support for the pole. This is known as the Lorentz force. Mechanical link between prime mover and armature. State the three classifications of dc generators. On applying Flemings right-hand rule to conductor CD, the direction of the induced current is from D to C. Although the direction of the current in the loop ABCD is reversed now, the external current still flows from brush B2 to B1. 11. The DC generator consists of a single-turn rectangular copper coil ABCD rotating about its own axis placed magnetic field provided by electromagnets and permanent magnet shown in the figure. INTRODUCTION TO DC GENERATOR GENERATOR is machine that converts mechanical energy to electrical energy. This preview shows page 1 - 17 out of 17 pages. DiM?]s|SQKipvf 9\$R DC machines- DC generators PDF by Firas Obeidat can be used to learn Construction of Simple Loop Generator, Working of Simple Loop Generator, Simple Loop Generator, Separately Excited DC Generator, Self Excited Shunt DC Generator, Self Excited Series DC Generator, Voltage Regulation, Loss in a DC Generator, E.M.F Equation of DC Generator . if(typeof ez_ad_units != 'undefined'){ez_ad_units.push([[250,250],'etechnophiles_com-banner-1','ezslot_12',670,'0','0'])};__ez_fad_position('div-gpt-ad-etechnophiles_com-banner-1-0');A commutator is also known as a mechanical rectifier. Yoke: The outer frame of a dc machine is called as yoke. of EEE, UIU Operation & The working of the DC generator is based on Faradays Law of Electromagnetic Induction. It provides a low reluctance path for the magnetic flux. endobj Explain the effect of motor reaction in a dc generator. 13. A direct current generator or DC Generator is an electrical machine that converts mechanical energy into electrical energy in the direct current domain. 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Hence the basic essentials for an electrical generator are: - (i) Magnetic field; (ii) Conductor or conductors and; (iii) Relative motion between magnetic field and conductors. Course Hero uses AI to attempt to automatically extract content from documents to surface to you and others so you can study better, e.g., in search results, to enrich docs, and more. flux is directly proportional to the field current. stream The magnetic field may be supplied by either a permanent magnet or an electromagnet. The coil is placed between the two poles of a strong horseshoe magnet. D.N.DEVANI (ELECTRICAL) A small amount of flux called residual flux is initially present in the poles of the generator. 2 0 obj produces in a generator and it is defined by faradays law of electromagnetic induction e.m.f. Flag, Summarize the article, "I survived a war as a child, but life doesn't owe me anything" by Nadja Halilbegovich. DC generators are broadly classified into two categories: In this type, the field winding is excited from an independent external dc source, such as a battery. This unit will discuss how these magnetic fields are produced in dc motors, and how magnetic fields induce voltage in dc generators. A Direct Current (DC) machine is an energy conversion device. A DC generator converts mechanical energy to electrical energy. 3. 4. e}g1IR)[3j,w6z=Cja5GPQn~Pup63@u81vf}(=~q=C/RM{WU. The armature winding is of two types: lap winding and wave winding. As the current increases, the flux increases, which leads to the voltage build-up process in the generator. It increases the cross-sectional area of the magnetic circuit, as a result, the reluctance of the magnetic path is reduced. It converts the induced alternating current in the armature conductor into the unidirectional current in the external load circuit in DC Generator action, whereas it converts the alternating torque into unidirectional (continuous) torque produced in the armature in motor action. It consists of hard-drawn copper segments insulated from each other forming a ring structure. The motive of armature is to residence the winding and to rotate the conductors inside the uniform magnetic field. (A) Pulsating DC developed by simple single-coil generator. In actual practice, a large number of turns of the insulated copper wire are wound on a soft iron core. Both of these generators produce electrical power based on the principle of Faraday's law of electromagnetic induction. It consists of stator and rotor. A DC generator can be used as a DC motor without any. xZmo7na?3|%PH7IR,%W+%qeI(ZA[R37~wU/.+Z= THZqAvy~vYu" Iob iDus~F*]ut~Zf3Ygny~vuEzyMDUIYGJv:pV7H*4D*y`W49$TD2Ajv!j0[|zm*:r.+*~]zxYYCF# j;Z3Km3Xc5+brBV}7Wli5f*FJV+IRM In a dc generator, the commutator collects the current generated in the armature winding. In small generator, yoke are made of cast iron but for large construction of DC generator, where weight of the machine is concerned, lighter cast steel or rolled steel is preferable for constructing yoke of dc generator. The DC motor working principle is that a current-carrying conductor experiences a mechanical force when placed in a magnetic field. In fact, when the machine is being assembled, the workmen usually do not know whether it is a d.c. generator or motor. Construction of DC Generator: The DC generator can also be used as a DC motor without any modification work in its construction. The construction is simple and costs are less. 4 0 obj For conductor AB, the magnetic field is from left to right while the force on it is acting upwards. 1 0 obj It is therefore used best where a huge variety of terminal voltage required. According to the connection of the field coil and armature coil, the self-excited generators are classified into three types: Here, the field winding is connected in series with the armature winding. YOKE: The yoke is the outer covering of the DC generator and is made of cast steel or cast iron. Now, to find the direction of the induced current, we will use Flemings right-hand rule. Thus in DC generators, when armature is rotated with the help of a prime mover and field windings are excited (there may be permanent field magnets also), emf is induced in armature . Construction of a DC Generator - explanation of its various parts - Circuit Globe Construction of a DC Generator A DC Generator is an electrical device which converts mechanical energy into electrical energy. 1.4 Construction of d.c. <>>> Pole Cores and Pole Shoes 3. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This page might contain some affiliate Links as we are participant in the Amazon Services LLC Associates Program. Fig. Basic constructional parts of a DC machine are described below. q@#_ `o)`up]Ya')yZ^9OHI!+b?gzWf.HjJ|=I\Gs 2v`"|X~6wn; DC machine can be used as a motor or as a generator. As the name suggests, the output obtained is DC (Direct current), where the magnitude of current or voltage is constant with time. A DC Machine is an electro-mechanical energy conversion device. In the construction of DC generator, armature center is designed as the rotating part and is built in cylindrical or drum form with slots on its outer outer edge. End of preview. Armature Winding 6. It is mounted on the shaft. ! OF8b1 @)r1FyQY6 It serves two purposes: Explain the causes of armature losses. An example of data being processed may be a unique identifier stored in a cookie. The construction of a DC shunt motor is similar to other types of DC motors, as shown in the figure. But there is a good similarity with a DC motor also as far as construction is concerned. <>/XObject<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/Annots[ 15 0 R] /MediaBox[ 0 0 612 792] /Contents 4 0 R/Group<>/Tabs/S/StructParents 0>> In an AC generator, the coil through which the current flows is fixed while the magnet moves. As mentioned above, the working of DC Generator is based on Faradays law. It supports the pole cores and provides mechanical protection to the inner parts of the machines. Most of the brain's energy consumption goes into sustaining the electric charge of neurons. #3. #5. <> Armature Windings. State the term that applies to voltage variation from no-load to full-load conditions and how it is expressed as a percentage. %PDF-1.5 JUixpd9 gNBPrq[Cr)NAMe)u `n1N1?a9c- GkA8zxKzKx]j{C`wl#hb`"y'O,>xZVfe0 WHy~ly-9qpB7qY!;p01K^~wiHJ\+kI QKcjr]/ RN.]~AgB)#4"FPIJOtsNUgfk(sRZ T&X;nBsTk,*Frl mxww13\Br]Q#&Y=heG=OBjX"k The consent submitted will only be used for data processing originating from this website. CONSTRUCTIONAL DETAILS OF A DC GENERATOR Here we are dealing with a DC generator. We and our partners use cookies to Store and/or access information on a device. Pole shoes spread magnetic field. Continue with Recommended Cookies. Any d.c. generator can be run as a d.c. motor and vice-versa. The brain, Question 1 10pts Alternating Current (AC)is the _________ flow of electric charge. The armature core is made up of thin laminations to reduce eddy current losses. DC generator or direct current generator generates a voltage when speed and flux are met.This machine is called a unidirectional (dynamo).It consists of the same basic elements as a simple AC generator like the multi-turn coil rotating uniformly in a magnetic field . Yoke (Magnetic Frame) 2. Based on this law, when a conductor moves in a magnetic field, the magnetic lines of force are cut. It consists of pole core and pole shoes. If you would like to change your settings or withdraw consent at any time, the link to do so is in our privacy policy accessible from our home page. In a DC generator, the electrical current flows only in one direction. 15. More than ten parts for DC generators are mentioned in various articles. Armature winding is made of copper and placed inside the slots of the armature core. Example 2 The one by one excited generator of example 1 is pushed at revolving pace one thousand rpm and the field modern is adjusted to zero.6 Amp. Field System The field system of dc generator consists of an even number of salient poles which are bolted inside the circular frame of the machine. And the direction of this force is given by FLEMING'S LEFT-HAND RULE. <> At any instant of time, the conductor AB is close to the North Pole and CD to the South Pole as shown in the figure below. DC motor working principle is similar to the working principle of a DC generator. Technical Details II. A single-loop generator with each terminal connected to a segment of a two-segment metal ring is shown in Figure 4. An electrical generator is a device that converts mechanical energy to electrical energy, generally using electromagnetic induction. #2. Course Hero member to access this document, 3. This generator comprises of several parts like yoke, poles & pole shoes, field winding, an armature core, armature winding, commutator & brushes. In many cases, it can be realized without brush, so it is mostly used by small and micro motors. Imsoh hkdstruhtokdmn pmrts kj m EH amhgodl, kdny prkvoels alhgmdohmn strld`tg tk tgl wgknl msslainy iut mnsk hmrrols tgl am`dltoh jnux, Sknls mrl fkodle tk tgl ykbl wotg tgl glnp kj iknts kr wlneod`. If the thumb, forefinger, and middle finger of the right hand are stretched out and placed mutually perpendicular to each other in such a way that the thumb represents the direction of force, the forefinger represents the direction of the magnetic field, then the middle finger will give the direction of induced current.. causes current to flow if the conductor circuit is closed. Give details. This is the main difference in their construction. The main parts of a DC generator are Figure. Basically, a DC generator can be used as a DC motor as well. 2 shows a cross-section of a typical 4-pole dc generator with its main parts labelled. It serves two purposes: 2) Provides mechanical support to the whole machine. The dc generator and dc motor both have the same general construction. The magnitude of this induced EMF is directly proportional to the rate of change of flux linkage. It is made of copper and wound around each pole core in such a way that adjacent North and South poles develop when the field winding is excited.if(typeof ez_ad_units != 'undefined'){ez_ad_units.push([[300,250],'etechnophiles_com-large-mobile-banner-2','ezslot_10',802,'0','0'])};__ez_fad_position('div-gpt-ad-etechnophiles_com-large-mobile-banner-2-0'); The armature is the center of electromechanical conversion.
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