Construction of dc machine ppt
Construction of dc machine ppt. Field winding 2. The high voltage produces flashover and arcing between the commutator segment and the brush. Transformers have either a core type or shell type construction. Working Principle The working of DC motor is based on the principle that when a current carrying conductor is placed in a magnetic field, it experiences a mechanical force. DC Machines • The stator of the dc motor has poles, which are excited by dc current to produce magnetic fields. Medium size Machines - power o/p of few KW to 250 KW . These machines are used in batteries to generate unidirectional power. YOKE -Acts as outer frame of the machine - Mechanical support -Low reluctance path for magnetic flux produced by field winding -High Permeability -For Small machines yoke is made of Cast iron -For Large Machines yoke is made of Cast Steel (Rolled steel) Large DC machine Small DC machine 4 Dec 31, 2016 · Construction Basic parts. Nov 23, 2021 •. When the motor armature is powered by a DC or rectified voltage supply U, it produces back emf E whose value is: E = U – RI. Zmuda) 7. hunzallah qureshi. It is a highly versatile energy conversion device. f can be defined as when the armature in the dc machine rotates, the voltage can be generated within the coils. EEL 3211 (© 2008, H. Some slides are taken from Ali Bazi’s presentations. A DC machine works on the principle of electromagnetic induction. The DC machines are classified into two types such as DC generator as well as DC motor. 1 of 62. • Most DC machines are similar to AC machines: i. it is useful ppt for the engineering students in order to get knowledge from it. Mar 28, 2024 · Keeping that in mind, a BLDC Motor is a type of synchronous motor in the sense that the magnetic field generated by the stator and the rotor revolve at the same frequency. Construction Magnetic frame Protective cover & mechanical support Carries magnetic flux produced by the poles Made up of cast iron and cast steel. Introduction of D. Jul 28, 2023 · Efficiency of D. DC Machines E. 3. Ketan Nayak. Education Business Technology. of poles (P) Dummy coils are not required. Types of Synchronous. The commutator and brushes allow current to flow to the external load. m. Electrical Machines Introduction A DC Machines can be used as either a DC generator or a DC motor. Where: Feb 10, 2016 · DC Machines. The rotor is then turned by external means producing a rotating magnetic field, which induces a 3-phase voltage within the stator winding. 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) ;) Read more. This is known as the Lorentz force. The document discusses DC machines which can operate as either motors or generators depending on the direction of power flow. WORKING PRINCIPLE OF DC MOTOR DC motors operate on Faraday’s principle of electromagnetism which states that a 2 DC Machines • The direct current (dc) machine can be used as a motor or as a generator • The major advantages of dc machines are Provides a wide range of speed control Has high starting torque Quick starting and stopping and acceleration Application areas are :mills, mines and trains Even today the starter of a car is a series dc motor DC motors are not common because most of the source Electrical Machines Lab Slides: Separately-Excited DC Motors. DC Machine Construction Figure 8. Dec 11, 2016 · Download now. Armature winding • Out of these, the field winding is stationary which does not move at all and armature winding is mounted on a shaft. 2 Cut-away view of dc practical generators The actual DC generator consists of the following essential parts: Magnetic frame or Yoke Pole Cores and Pole Shoes Pole Coils or Field Coils Armature Core Armature Windings or Conductors DC Machine Example 1: A 25 kW 125 V separately excited dc machine is operated at a constant speed of 3000 rpm with a constant eld current such that the open circuit terminal voltage is 125 V. THIS IS ABOUT THE DERIVATION OF THE EMF EQUATION IN A AC GENERATOR AND THE OPERATIO PRINCIPLE. Types of dc generator - Download as a PDF or view online for free. DC machines have a DC output only because they have a means of converting the AC into DC. Ta ∝ Φ. 5- Carbon Brushes of a DC Machine. • In the neutral zone, in the middle between the poles, commutating poles are placed to reduce sparking of the commutator. The outer frame of a DC motor is a hollow cylinder made up of cast steel or rolled steel is known as yoke. Brushless Motors are available in three configurations: single phase, two phase and three phase. Operating Principles of DC Machines: Download Verified; 22: Constructional Features of DC Machines: Download Verified; 23: Generated EMF and Torque in DC Machines: Download Verified; 24: Armature Reaction: Download Verified; 25: Commutation in DC Machines: Download Verified; 26: Separately Excited DC Generators: Download Verified; 27: DC Shunt The efficiency of BLDC motors is typically 85 to 90 percent, whereas as brushed type DC motors are 75 to 80 percent efficient. generator can be run as a d. f of rotation can be called the generated emf, and Er=Eg. C generator input mechanical & output electrical Variation of η with load current. 13 likes • 15,690 views. LEARNING OBJECTIVES. Spring 2013 Synchronous Generators. Jan 9, 2014 · A SIMPLE explanation of the construction and working principle of a DC Machine (DC Motor or DC Generator). The back emf E is linked to the speed and the excitation by the equation: E = k ω Φ. C Machine Construc The sudden interruption of an inductive current generates high voltages . Jul 8, 2020 · Construction of DC machines. Basic constructional parts of a DC machine are described below. Engineering Business Technology. Operation Principle The rotor. In case of motor it inverts the dc supply to ac. Upon completion of the chapter the student should be able to: Apr 11, 2019 · AC motor DC motor. Follow. Subhajit Bose (03) Shuvankar Das (02) Binoy. Sep 18, 2015 · 4. C Generator Efficiency of generator is defined as the ratio of output power to input power Efficiency (η) =output ×100 input input=output+ losses (or) output=input-losses For D. It discusses DC machines functioning as generators and motors. pdf), Text File (. CONSTRUCTION. Jul 10, 2020 · 6 DC MACHINE CONSTRUCTION AND ARMATURE WINDING • A d. DC Machine Construction DC Motor Operation DC Motor Operation In a dc motor, the stator poles are supplied by dc excitation current, which produces a dc magnetic field. The direction of this force is given by FLEMING’S LEFT-HAND RULE. Introduction • Unlike induction machines, the rotating air gap field and the rotor in the synchronous machine rotate at the same speed, called the synchronous speed. • Which motor is potentially dangerous to operate with no load on it? The series dc motor • Why series dc motors should not be used in belt drives? The above figure shows constructional details of a simple 4-pole DC machine. The direction of the mechanical force is given by Fleming’s Left-hand Rule and its magnitude is given by F = BIL Newton. •Stator consist of a frame, and it contains “Pole Shoes” which are projected inward. Oct 28, 2014 · Devices & Hardware. We can run the machine as a motor or as a generator. Tareq Foqha. Mar 26, 2024 · DC motor working principle: The DC motor working principle is that a current-carrying conductor experiences a mechanical force when placed in a magnetic field. History of DC. DC Generator According to faradays law of electromagnetic induction, whenever a conductor is moved in magnetic field, dynamically induced emf is produced in the conductor. Electrical Frequency Electrical frequency. sanjay kumar pediredla. The emf equation of the DC generator is given by the equation: \ (\begin {array} {l}E_g=\frac {P\phi ZN} {60 A}\end {array} \) where. Swinburne's test is the most commonly used and simplest method of testing of shunt and compound wound dc machines which have constant flux. Which is the cause of DC motor. No. where RI represents the ohmic voltage drop in the armature. In a generator, the e. Read more. Overview of Direct Current Machines Construction Principle of Operation Types of DC Machine Power Flow Diagram Speed Control. Some torque is Jun 29, 2018 · 7. A DC machine consists of two basic parts; stator and rotor. electrical machines - Download as a PDF or view online for free. In case of generator it rectifies the induced ac to dc. Larger size Machines - power o/p as high as hundreds of megawatt. 1 of 21. As the armature rotates, a voltage is generated in its coils. Jan 18, 2023 · (1) DIRECT METHOD : In this method, the DC machine is loaded directly by means of a brake applied to a water cooled pulley coupled to the shaft of the machine. Introduction to DC Machine. A is the number of parallel lanes within the armature. The process of translation is known as - PowerPoint PPT Presentation. This excitation voltage can be produced by the generator itself or it can be supplied by an outside source, such as a battery. ALL information about d. N is the rotation of armature in r. CH-2_3 Induction Machines. Windings in DC Machine •In any dc machines, there are two windings: 1. Deepak Kumar Mohapatra. H. Rajal Patel. The main function of the yoke in the machine is to offer mechanical support intended for poles and protects the entire machine from moisture, dust, etc. D. Brushless DC motors use a rotating permanent magnet or soft DC Machines : DC machines are like AC machines in that they have AC voltages and currents within them. EFFICIENCY 07/28/14 Professor MD Dutt HOD EX Department SRCT Bhopal 8 Input from prime-mover Elec- magnetic Power =EaIa Arm. 1 of 59. It also describes the construction and working principles of DC generators and motors, including their components like Used in high voltage low current machines. about winding also WORKING PRINCIPLE about excitation. On the right-hand end of the dynamometer is a clamp which locks the rotor and stator. F Equation of DC generator. • Conversion from mechanical to electrical: generator • Conversion from electrical to mechanical: motor. Sep 15, 2014 · 4. When current passes through a coil in a magnetic field, it experiences a force due to Lorentz force. 1 of 20. A Shunt motor develops more power for the same construction size than a DC shunt motor. This magnetic field interacts with the armature winding, which is connected to a load, causing the rotor to rotate and generate mechanical energy. pptx), PDF File (. PERMANENT MAGNET BRUSHLESS DC MOTORS Prepared by S. pptx. motor and vice- versa. • Synchronous machines are used primarily as generators of electrical power, called synchronous generators or alternators. patel andil. Dec 18, 2017 · Speed Control Of DC Motor. in this ppt to know the various types of dc generator and its emf equation . Brushed DC electric motor generates torque directly from DC power supplied to the motor by using internal commutation, stationary magnets (permanent or electromagnets), and rotating electrical magnets. Nov 2, 2019 • Download as PPTX, PDF •. A. machine. ppt), PDF File (. TYPE OF DC MACHINE. Oct 13, 2016 • Download as PPTX, PDF •. Oct 22, 2012 · Brushless DC Motors. 19 likes • 18,934 views. Ppt on DC Generator - Download as a PDF or view online for free. 1. Cylindrical-Rotor Synchronous Generator Stator Cylindrical. Aug 11, 2012 · MECH1200 • Which machines have a more complex construction, DC or AC machines? DC machines are much more complex, due to existence of interpoles and commutation circuits. construction of it etc. . Peter Sauer’s ECE 330 lecture notes. Generates more emf. L 10. Dec 24, 2020 · Dc machines ppt. TYPES OF DC. The machine is acting as a motor with V t = 123 V Jul 28, 2014 · 8. Dc motors and its types - Download as a PDF or view online for free. Contents. • Several turns of copper wire are wound through these slots Commutator • The Commutator converts AC to DC(Generator) and DC to AC (Motor) • The Commutator is attached to the same shaft of the armature • Made by hard drawn copper & have several copper segments insulated by mica. Find the speed. Working Principle of. (In motor, the commutator reverses the current through the armature conductors to get May 27, 2014 · 42 likes • 29,963 views. Oct 7, 2019 · So, these machines are used at a place where there is a requirement of single directional power. Dc shunt motors; construction and working - Download as a PDF or view online for free. C Machine Working PrincipleD. View PDF. Understand the parts of a DC Machine and the const Jan 30, 2017 · Jan 30, 2017 • Download as PPTX, PDF •. Jan 5, 2020 · Presentation Transcript. The commutator and brush arrangement works like a mechanical dual converter. The yoke serves following two purposes. Their speed may be easily adjusted in very fine increments ranging from standstill to rated speed and even above. Engineering. Key points include: - DC machines can operate as generators, converting mechanical energy to electrical energy, or motors, converting Jan 7, 2020 · Presentation Transcript. Nov 9, 2019 · #dcmachine #dcgenerator#hindi#drhemantmahala About the video-D. Permanent magnet (PM) brush-less DC motors (BLDCM). DC Generators - Download as a PDF or view online for free. It is not practically possible to arrange loads for machines of large capacity. Presented By: PRAVEEN KUMAR APP. 1 of 18. Oct 4, 2017 · The key components of a transformer are the magnetic core and windings. Working of a DC Motor Fleming’s Left-hand Feb 5, 2021 · A direct current (DC) motor is a type of electric machine that converts electrical energy into mechanical energy. Used in low voltage high current machines. Mar 29, 2019 · Figure 1 – Production of torque in a DC motor. DC MOTOR. 35 likes • 10,431 views. Oct 11, 2015 · Oct 10, 2015 • Download as PPT, PDF •. Oct 8, 2012 • Download as PPTX, PDF •. 4 likes • 351 views. Z is the total number of armature conductor. 5 likes • 3,335 views. The machine is acting as a generator with V t = 124 V and P t =24 kW. Apr 4, 2023 · The starting torque of a DC series motor is relatively high compared to other motors, so such motors are widely used for traction applications. Sep 15, 2018 · Re-uploaded with updates: Details of construction and working of a dc motor is explained in this video. caren chepkirui. electrical machines. P is the number of poles in a generator. Aug 10, 2016 · 4 likes • 3,896 views. So it can rotate freely. • In this test the efficiency of the machine at any load is pre-determined. Jul 8, 2013 · Jul 8, 2013 • Download as PPT, PDF •. DC motor Fall15 Revised: November 4, 2016 11 of 21 THE TEST SET-UP The DC machine to be tested and the dynamometer have already been placed on the bench and mechanically coupled. 111 likes • 58,749 views. 1 of 40. Dc machines ppt - Download as a PDF or view online for free. • Why we are choosing PMBLDC Motor • Comparison between conventional dc motor & PMBLDC Moto. Quick and Easy to Customize. Yoke: The outer frame of a dc machine is called as yoke. Exact details should be available from the manufacturer. Synchronous Machines: Construction, cooling, working, excitation systems. There are wide varieties of BLDC motors available ranging from small power range to fractional horsepower, integral horsepower and large power ranges. R. Scribd is the world's largest social reading and publishing site. No : TEQIP016971 M. DC motors operate by converting electrical energy into mechanical energy using electromagnetic principles. txt) or view presentation slides online. Salient-Pole Synchronous Generator. DC generators - To convert mechanical energy to electrical energy. Yoke. In the case of a motor, the emf of rotation is known as Back emf or Mar 16, 2017 · It is named after Sir James Swinburne. Disclaimer- These handouts only provide highlights and should not be used to replace the course textbook. DC motor working principle is similar to the working principle of a DC generator. 30 likes • 27,312 views. Construction •The outer part of the motor is generally static, which is known as stator. The direction of this force is Jan 14, 2023 · A DC machine is an electromechanical energy alteration device. Field Winding of a DC Machine. A Servo motor is beneficial in rotating an object Sep 22, 2015 · Construction and components of DC Machine – Principle of operation – Lap and wave windings-EMF equations– circuit model – armature reaction –methods of excitationcommutation – interpoles compensating winding –characteristics of DC generators. The term (PZ / 2πA) is practically constant for a DC machine. Oct 2, 2014 · Construction. 3- Commutator. • Connection of windings for operation as motor: To operate the dc machine as a motor, the Mar 17, 2021 · An essential example of a DC machine is a copper coil spinning on its own axis between two magnets. Chapter 5. of parallel paths (A) = Requires equalizer rings. Oct 9, 2012 · testing of dc machine. 1- Field (magnetic poles) 2- Armature. Thus, armature torque is directly proportional to the product of the flux and the armature current i. DCMotors • Construction very similar to a DC generator • The dc machine can operate bath as a generator and a motor. Feb 11, 2017 · 1. 12 Jan 21, 2020 · Sourabh sharma. DC Generators. • When the dc machine operates as a motor, the input to the machine is electrical power and the output is mechanical power. Upon completion of the chapter the student should be able to: Jun 6, 2017 · Dc machines (Generator & Motor) The document discusses DC machines and motors. Anu71. DC motor is an electric motor that runs on direct current (DC) electricity. Nov 23, 2021 · DC Generators. 3 LECTURE 24 INDUCTION MACHINES (1) Acknowledgment-These handouts and lecture notes given in class are based on material from Prof. Aug 26, 2017 · 4 likes • 2,256 views. Introduction. Rathinamala Assistant Professor/ EEE KIT-KalaignarKarunanidhi Institute of Technology. 6. It supports the field pole core and acts as a protecting cover to the machine. When a dc voltage is applied to the field windings of a dc generator, current flows through the windings and sets up a - - steady magnetic field. Synchronous Machines. The field produces a magnetic medium and the armature produces voltage and Dec 5, 2014 · Electrical machine Day 11,Construction of DC, Induction motor, Synchronous generator, Synchronous motor,alternator,Basic Electrical Engineering Syllabus Introduction of Machine Classification of Machine Construction of DC, Induction & Synchronous machine Working Principle EMF Equation of all machine A transformer works on alternating current Apr 12, 2020 · WORKING PRINCIPLE OF DC MOTOR A machine that converts DC Electrical Energy into Mechanical Energy(Motion) is known as a DC motor. This article gives an overview of a DC machine, which includes construction, working, parts, EMF equation, types, its losses, and applications. A DC Machines can be used as either a DC generator or a DC motor. DC machines can develop rated torque at all speeds from standstill (locked-rotor) to rated speed. • In fact, the dc machine is used more as a motor. terminal power = Vta Ia Output power = Vt IL No-load rotational loss (friction +windage+core)+stray load loss Arm. PrabhaMaheswariM. Servo Motor – Types, Construction, Working, & Applications. DC Machines-Introduction, Constructional Features: Download: 19: DC Machines- EMF and Torque Equations & Generator Operation: Download: 20: DC Machines- OCC & Load Charactristics Classification: Download: 21: DC Machines - Armature Reaction: Download: 22: DC Machines - Voltage Build-up and Load Characteristics: Download: 23 •Explain and describe using drawings the construction of dc machine •What is the function of the following in dc machines: a- armature winding b- field winding •Explain how dc machines can work as generator and motor •State some applications and types of connections of dc machines (generator and motor) •Derive the EMF equation for dc Dec 31, 2023 · Some of the parts of the DC machine is discussed below. • DC machines have DC outputs just because they have a mechanism converting AC voltages to DC voltages at their terminals. machine PPT Templates Download over 6,300+ complete free templates in high resolution. Overview of Direct Current Machines • Direct-current (DC) machines are divided into dc generators and dc motors. e. Download now. Nov 2, 2019 · Electrical dc machines. C. Construction of synchronous machines In a synchronous generator, a DC current is applied to the rotor winding producing a rotor magnetic field. Most hydraulic. Contribute to dinglei2022/en development by creating an account on GitHub. Machine Methods of Speed control. sudeep kumar. The field winding produces a magnetic field when energized. 1 General arrangement of a dc machine. PERMANENT MAGNET BRUSHLESS DC MOTORS • It is a brushless dc motor. When a direct current is supplied to the field winding, it creates a magnetic field. 1 of 52. Mar 22, 2019 · DKT 123. CHAPTER 4. Oct 21, 2012 • Download as PPTX, PDF •. Education. Synchronous machines - Download as a PDF or view online for free. Lecture dc machines - Download as a PDF or view online for free. It is made up of cast iron or steel. Nov 23, 2021 · construction of a dc machine 3 5. ppt - Download as a PDF or view online for free. CONSTRUCTION OF DC MACHINE Armature winding • This winding is placed in the slots of rotor. Sep 17, 2014 · DKT 213. Mar 17, 2024 · Construction of a practical DC Machine As stated earlier, whether machine is DC generator or a DC motor the construction basically remains the same as shown in the Figure (a) and (b) For the satisfactory operation of a DC generator, it should consist of a stator and rotor The stator accommodates the yoke, the main field system and the brushes Modern Machine Manufacturing Techniques ** Wide range of power output Small size Machines ± M/cs having power o/p of 750 watts. DC Machine. Converters that are used to continuously translate electrical input to mechanical output or vice versa are called electric machines . • Principal components of d. Feb 27, 2019 · 2. Parts in a machine & its functions2. Machine Some important terms related to speed control EMF equation of D. Mrityunjai Yadav. So this method is used only for testing of small dc machines . DC motors - To convert electrical energy to mechanical energy - Widely used - Main feature: speed control is simple and Oct 13, 2016 · DC GENERATOR. 2. TECH (PEED) IIT (ISM) DHANBAD. 1 of 29. One of energy can be obtained from the other form with the help of converters. “NSPEES – 2012” BRUSHLESS. DC motors take electrical power through direct current, and convert this energy into mechanical rotation. in this ppt we have explained the construction and working of dc shunt motor, application, characteristic are also discussed. The basic working principle of a DC motor is: "whenever a current carrying conductor is placed in a magnetic field, it experiences a mechanical force". 4- Yoke and Bearings. Ia Shaft Torque (Tsh) Due to iron and friction losses in a dc machine, the total developed armature torque is not available at the shaft of the machine. machines are field, armature core, armature winding, commutator, and brushes DC GENERATOR CONSTRUCTION Field system • Function of the field is to produce uniform magnetic flux. c. Unique slides with a clean and professional look. The DC machine e. Download to read offline. Condition for Maximum Efficiency in DC Machine It varies from motor to motor, but typically the maximum efficiency is when running at about 80 percent of maximum speed, driving a load that is about 20 percent of the maximum stall torque. Shell type Apr 12, 2020 · 3. A DC motor is defined as a class of electrical motors that convert direct current electrical energy into mechanical energy. Construction of DC Machine Construction of DC Machine Yoke Another name of a yoke is the frame. - Limited use due to solid state rectifier. 1 Practical DC generator construction Fig. A practical DC machine also needs a commutator, brushes, poles and bearings. Dc Motors Ppt - Free download as Powerpoint Presentation (. 1 of 23. Parallel winding. Free Slides. R a = 0:02 . C Machine Construction and Working Principle D. DC machines are the most versatile of all rotating electrical machines. This is called FIELD EXCITATION. Machine : 1. 1) A DC machine consists of a yoke, poles, field winding, armature, commutator, and brushes. Introduction • An electrical machine is link between an electrical system and a mechanical system. This document provides an overview of DC machines, including their construction, principles of operation, and characteristics. Electrical Machines -1 Lecture Notes Prepared By. After this slide you can watch a video based on this PPT or you can skip it. In the case of a generator, the emf of rotation is called the Generated emf or Armature emf and is denoted as Eg. ConstructionFor PPT’s and Materials, click on the below Direct-current (DC) machines are driven from a DC power supply. Nov 22, 2016 · 1. Jan 26, 2021 · DC Generators: Construction of a DC Machine Topics discussed:1. This lock is used when measuring the locked-rotor torque of the test machine. 5. 3) DC machines include shunt, series, and compound A servo motor or servo is one type of electrical motor used to rotate the machine parts with high precision. May 12, 2022 · THIS PPT GIVES A GOOD REVIEW POINT ON INDUCTION MACHINES AND HOW THEY WORK INCLUDING THEIR CHARACTERISTICS. It can be used for AC or DC supply; therefore, it is also known as a universal motor. they have AC voltages and current within them. Out of these, the three phase BLDC is the most common one. Core type transformers have cylindrical coils wound around a single core, while shell type transformers have multilayer coils wound around a central limb with the core encircling the coils. 4. Download Free PDF. Apr 2, 2017 · Apr 2, 2017 • Download as PPT, PDF •. This motor includes a control circuit that provides feedback on the current location of the shaft of the motor so this feedback simply allows these motors to revolve with high precision. This mechanism is called a commutator, and DC machines are also knowow asn as commutatingcommutating machine y machinery. Lecture Notes Elements of Electrical Machines 6 1. Jul 25, 2014 · Chapter 6DC and AC Machines. 1 of 16. ppt / . The field is the Nov 7, 2023 · Here is the schematic diagram of a DC Motor. Apr 12, 2020 · 6. Generates less emf. We will understand the DC motor construction and how a DC motor converts the supplied DC Dec 11, 2016 · Commutator The commutator is mounted on the rotor of a dc machine. It provides explanations of Maxwell's corkscrew rule and Fleming's left-hand and right-hand rules for determining the direction of magnetic fields. Two types of DC motor - brush and brushless DC Motor. Brake Test is an example of direct test. Introduction Machines are called • AC machines (generators or motors) if the electrical system is AC. M. also new lerner. testing of dc machine - Download as a PDF or view online for free. copper loss Ia 2 Ra+brush contact loss Series field loss IL 2 Rs +shunt field loss If 2 Rf Input power from mains =Vt IL Elec- magnetic Power =EaIa Arm Construction of DC Machine - Free download as Powerpoint Presentation (. 47 likes • 27,053 views. 2) As the armature rotates in the magnetic field, an EMF is induced based on Faraday's law of electromagnetic induction. P. Large size Machines - power o/p of 250 KW to 5000 KW . 8. 1 of 22. In the motor, the emf of rotation can be called as counter or back emf, and Er=Eb. Dec 29, 2022 · DC machines PPT. A DC machine consists of a static electromagnetic or permanent magnetic field and a rotating armature. From the above definition, we can conclude that any electric motor that is operated using direct current or DC is called a DC motor. • It has a PM rotor type. The working principle of a DC machine is when electric current flows through a coil within a magnetic field, and then the magnetic force generates a torque that rotates the dc motor. AC Generators and Motors Course No: E03-008 Credit: 3 PDH. EMF EQUATION OF DC MACHINE A DC generator produces direct power based on fundamental principle of Faraday's laws of electromagnetic induction. Dc motor ppt. dc-generators-unit-1. A DC motor consists of six main parts, which are as follows. mahesh babu. M. p. hj lj oh jk fp be fb qe hs gz