Dc motors are rarely utilized in normal applications as a result of all electrical supply firms furnish electrical energy but, for special applications like in steel mills, mines and electric traction, its advantageous to convert ac into dc so as to use dc motors. These motors are lesser when compared with ac models. This pdf ebook notes on basic electrical engineering contains brief concise notes and will help you in your studies for your first year semester examination. Dc machines in dc machines, the field winding is wound onto the stator, while the armature winding is located on the rotor. Download be8251 basic electrical and electronics engineering lecture notes, books, syllabus parta 2 marks with answers be8251 basic electrical and electronics engineering important partb 16 marks questions, pdf books, question bank with answers key. Basic electrical engineering pdf notes bee pdf notes. Basics of dc motors for electrical engineers beginners. Nptel transformers video lectures, electrical machines lectures, dc machines video, nptel video lectures, nptel online courses, youtube iit videos nptel courses. Principles of selection of electric motors are introduced. The basic operating principle of dc motor is the same as other electromagnetic motors. It differs from conventional dc motor in such that it doesnt contains brushes and the commutation is done using electrically, using a.
Current is supplied to the rotating armature winding through commutator segments. A controller is embedded into the electric motor to facilitate the process within the lack of a commutator and a slip ring. As well see, there are some caveats and subclassifications. A typical servo motor comprises of three wires namely power, control, and ground. In todays tutorial, i am going to share a difference between dc and ac motors. The brushless dc motors were first developed for achieving superior performance within a lesser space than brushed dc motors. Dc series motors are widely used for electrical traction applications, i. Moreover, we also discuss about various factors that affect working of these motors and reliable ways to improve.
Brushless dc motor is not a dc motor but a permanentmagnet synchronous machine. Some of the applications of electrical drives are also highlighted. Both of these motors are used almost in every kind of robotic projects and if we talk about engineering projects then they are used in like 70% of the engineering projects. Nov 06, 2018 a typical servo motor comprises of three wires namely power, control, and ground. Various types of losses that occur in dc machines and how to calculate efficiency vi. Video lecture on working principle of a dc motor of chapter dc machine of subject basic electrical engineering for firstyear engineering students. Nptel electrical engineering introduction to hybrid and electric vehicles module 4. We not only talk about different type of motors but we also see how different motors work under different conditions. Umanand, principal research scientist, power electronics group, cedt, iisc bangalore. Mathematical modeling of brushless dc motor and its speed. A brushless dc motor consists of a rotor in form of a permanent magnet and stator in form of polyphase armature windings.
Some of the applications where dc motors employed are listed below dc series motor. After going through the lesson, the reader is expected to have clear ideas of the following. Methods for speed control of dc motors and applications of dc motors v. Electrical engineering electrical machines i nptel. The control principles of various dc and ac motors using solid state converters are discussed. Electrical engineering basic electrical technology nptel. Apr 24, 2016 dc motor applications in industries in spite of wide use of ac supply, dc machines have some advantages compared to ac motors and are used in industries for some applications. The phenomena of armature reaction and commutation iii. Control engineering helps in the development of various electronicsbased control systems to enhance or replace the mechanics of the mechanical systems. Lecture series on basic electrical technology by prof. Dcdc converters for ev and hev applications dcdc converters for ev and hev applications introduction the topics covered in this chapter are as follows. Hence dc motors are always a good ground for advanced control algorithm. Massachusetts institute of technology department of electrical engineering and computer science 6.
Craig 4 in rotational electromechanical devices other than dc machines, torque is produced as a result of one or more magnetic fields which rotate about the air gap of the device. Electrical engineering modelling and analysis of electric. Here are the pdf lecture notes for the first year engineering subject basic electrical engineering. Elen 3441 fundamentals of power engineering spring 2008 85 motor types. What is common to all the members of this family is that the basic. Bee1101 1 st and 2 nd semester syallabus modulei 10 hours dc networks. Dc motor introduction, principle and working introduction. Basics of dc motors for electrical engineers beginners on photo. According to the most common industry naming conventions of today, there are three dc motor subtypes. This article will serve as a comprehensive guide for articles related to ac and dc motors. When a current carrying conductor is placed in a magnetic field, it experiences a torque and has a tendency to move. Ch published on 20190531 download full article with reference data and citations. An engineering guide to ac and dc motor designs and operation.
Basic electrical technology nptel online videos, courses. Dc motor applications in industries engineering tutorial. Other members of the family are the directcurrent dc motor or generator, the induction motor or generator, and a number of derivatives of all these three. Direct current motors have been used since the early 20 th century and was a dominant among all the other motors available at that time. Working or operating principle of dc motor electrical4u. Characteristics of generators and parallel operation of generators iv. In the first course, mainly the dc motor control both steady state and dynamic, and steady state torque. Dc brush motors, dc permanentmagnet pm motors, and dc universal motors.
Electrical brushless dc motor introduction, working and. In the tutorial dc motor direction control using arduino, i have interfaced a dc motor with arduino uno board to control its clockwise and counter clockwise direction. Working or operating principle of dc motor july 11, 2019 march 20, 20 by electrical4u the dc motor is of vital importance for the industry today and is equally important for engineers to look into the working principle of dc motor in details that we have discussed in this article. Dc motor principle a machine that converts dc power into mechanical energy is known as dc motor. C rotating machine will be the main topics to be discussed in this. The torquespeed characteristics of dc motors are most compatible with most mechanical loads.
A rotating armature coil passes through a magnetic field that develops between the north and. Dc machines 1 dc machines transformsmechanicalenergyintoelectric energywithdc voltage and current dc generatoror dynamo, or conversely dc motor. The control characteristics of these motors have resulted to their immense use and hence control of their speed are required. Torquespeed characteristics of three types of dc motors.
Dec 07, 2014 dc motor introduction, principle and working introduction. Dc motor applications in industries in spite of wide use of ac supply, dc machines have some advantages compared to ac motors and are used in industries for some applications. Mechanical discipline is employed in terms of various machines and mechanisms, where as electrical engineering as various electric prime movers viz. In this lesson aspects of starting and speed control of d. Electrical engineering video lectures from nptel, iit, mit. What is common to all the members of this family is that the basic physical process involved in their operation is the conversion. Sep 27, 2016 video lecture on working principle of a dc motor of chapter dc machine of subject basic electrical engineering for firstyear engineering students. Nptel syllabus advanced electric drives video course course outline the first course on electric drives usually introduces the concept of control of electric motors for various types of mechanical loads. The motors are small and are extremely powerful for the size. Dc machines 1 dc machines transformsmechanicalenergyintoelectric energywithdc voltage and currentdc generatoror dynamo, or converselydc motor. Armature reaction, separately excited and self excited generators, load characteristics of shunt, principle of operation, speed control of d. Various types of losses that occur in dc machines and.
These achieve other torquespeed curves, including increasing torque. Dc motors although ac motors are used in most of the cases, dc motors have many applications and used for multipurpose applications. Pdf be8251 basic electrical and electronics engineering. May 31, 2019 mathematical modeling of brushless dc motor and its speed control using pi controller written by mouliswararao. Electrical engineering industrial drives power electronics nptel. Some variations on the series and shunt connections are common, and referred to as com pound dc motors. Electrical machines 1 pdf notes em 1 pdf notes smartzworld. Electric motors and drives fundamentals, types and applications third edition austin hughes senior fellow, school of electronic and electrical engineering, university of leeds amsterdam boston heidelberg london new york oxford paris san diego san francisco singapore sydney tokyo newnes is an imprint of. A direct current dc motor is an electric machine that converts electrical energy to mechanical energy.
The design, construction, and the modes of operation are different. I have used a motor controller named as hbridge to control the direction of dc motor. Nptel video lecture topics for electrical engineering new no. In other words, when a magnetic field and an electric field interact, a mechanical force is produced.
Ac and dc motor designs and operations are explained in this article. Let us now solve some problems on shunt, separately excited and series motors. Difference between dc and ac motors the engineering projects. The simple understanding of concepts and design of dc. Its operation is based on the principle that when a current carrying conductor is placed in a. Electrical engineering video lectures tutorials lecture 16 power ports lecture 24 dc machines part 2 lecture 15 power factor lecture 25 dc generators lecture 22 the practical transformer part 3 lecture 18 transformer basic part 2 lecture 27 dc motors lecture 26 dc generators 2 lecture 37 induction motor 2 lecture 20 the. Brushless dc motors nyu tandon school of engineering.
Mathematical modeling of brushless dc motor and its speed control using pi controller written by mouliswararao. Electrical machinesi nptel online videos, courses iit. Nov 11, 2012 in todays tutorial, i am going to share a difference between dc and ac motors. The dc motor or direct current motor works on that principal.
Dc motor introduction, principle and working my tech info. Transients in rl, rc and rlc circuits with dc excitation. The principle of operation of a dc generator is similar to that of the ac generator, which was discussed previously. Brushless dc servomotor a servo motor is a dc, ac, or brushless dc motor combined with a position sensing device digital decoder. Kirchhoffs laws, node and mesh analysis, deltastar and stardelta transformations. Reluctance machines, induction machines, synchronous machines, stepper motors, and brushless dc motors. Debaprasad kastha, department of electrical engineering, iit kharagpur.
Apr 01, 2008 lecture series on basic electrical technology by prof. Jul 11, 2019 working or operating principle of dc motor july 11, 2019 march 20, 20 by electrical4u the dc motor is of vital importance for the industry today and is equally important for engineers to look into the working principle of dc motor in details that we have discussed in this article. Reluctance machines, induction machines, synchronous machines, stepper motors, and. Precession, gyroscopes, effect of precession motion on the stability of moving vehicles such as motor car, motor cycle, aero planes and ships, static and dynamic force analysis of planar mechanisms, friction, clutches, friction clutches, brakes and dynamometers, turning moment diagram and fly wheels, governers, balancing, balancing. The shape and size of these motors depends on their applications. Lecture 05 dc motors electric motor power engineering. Pdf basic electrical engineering 1st year ebook, notes.