Apr 01, 2008 lecture series on basic electrical technology by prof. They get the armature of the motor spinning with just a battery, a few wires, and a permanent magnet. Dc machines 1 dc machines transformsmechanicalenergyintoelectric energywithdc voltage and current dc generatoror dynamo, or conversely dc motor. The frequency of an alternated circuit is measured by the number of times the currents andor voltages change direction polarity in a unit of time. Mod01 lec39 lecture39testing of dc series motors 40.
A direct current dc motor is an electric machine that converts electrical energy to mechanical energy. Power semiconductor drives notes pdf psd notes pdf book starts with the topics introduction to thyristor controlled drives, single phase semi and fully controlled converters connected to d. Brushless dc servomotor a servo motor is a dc, ac, or brushless dc motor combined with a position sensing device digital decoder. Lecture 16 signalflow graph for dc motor control lecture 17 steadystate calculations lecture 18 differential equation model and laplace transformation model.
Umanand description about all chapters i consider this as lecture 2 meaning the first part the motivation as 1, the second part the course contents as 2 and the lecture 3 which will be of course the next hour. Electrical machines i online course video lectures by iit. 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. Bldc motors produce more output power per frame size than brushed dc motors and induction motors. Nptel provides courseware in the form of video lectures and web courses. Motor property 1 torque is proportional to current question.
Industrial drives and power electronics free video lectures. It differs from the conventional dc motor in such that it doesnt contain brushes and the commutation is done using electrically, using an electronic drive to. Analysis of single phase full controlled converterfed separately excited dc motor. Nptel syllabus pulse width modulation for power electronic converters video course course outline converter topologies for ac dc and dc ac power conversion, overview of applications of voltage source converters.
Dc motor introduction, principle and working introduction. The very basic construction of a dc motor contains a current carrying armature, connected to the supply end through commutator segments and brushes. Lecture 7 stepper motors, permanent magnet dc motors. Speed control of separately excited dc motor using controlled rectifiers. Nptel provides elearning through online web and video courses various streams. Basic electrical technology lecturer nptel videos description notes by prof. Mod01 lec23 lecture23generated emf and torque in dc machines. 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. To some, motor speed control is somewhat of a mystical science, a science that causes motors and machines to sometimes operate in unexpected ways.
Umanand, principal research scientist, power electronics group, cedt, iisc bangalore for more detail. An intro to the four types of dc motors motion control blog. A brushless dc motor consists of a rotor in the form of a permanent magnet and stator in the form of polyphase armature windings. Lecture series on industrial automation and control by prof. This article explains about bldc motors in details. Electrical machines for mechatronics laboratory 7 4 speed control of series dc motors unlike with the shunt dc motor, there is only one efficient way to change the speed a series dc motor. Motor principles, adjustible speed and servo drives 36. Mod01 lec32 lecture32speed control of dc shunt motors.
In other words, when a magnetic field and an electric field interact, a mechanical force is produced. Debaprasad kastha, department of electrical engineering, iit kharagpur. Vf speed control of 3 phase induction motor using space. This is an introductory lab designed to introduce you to the oscilloscope and matlab. Mukhopadhyay, department of electrical engineering, iit kharagpur.
As well see, there are some caveats and subclassifications. Nptel provides elearning through online web and video courses various. Nptel electrical engineering video lecture online study. Most of these courses consists 40 videos and 1 hour duration each. Nptel video lecture topic list created by linuxpert. Watch physicists becky thompsonflagg and ted hodapp trade quips as they show how to take apart a small dc motor and find out how it works. Draw the simplified speedtime curve for the main line services and show all necessary periods. Lecture series on basic electrical technology by prof. Nptel video course electrical engineering nonlinear dynamical systems subject coordinator prof. Virtually every factory and shop has one thing in common.
Nptel video lecture topics for electrical engineering new no. Dec 07, 2014 dc motor introduction, principle and working introduction. This video lecture, part of the series industrial drives. As soon as we supply direct current in the armature, a mechanical force acts on it due to the electromagnetic effect. Reluctance machines, induction machines, synchronous machines, stepper motors, and brushless dc motors. The main disadvantag e of the ac motor is the cost of the electronics package needed to convert invert the battery s direct current to alternating current for the motor. Ee2403 special electrical machines a course material on. Brushless motors require less maintenance, so they have a longer life compared with brushed dc motors. Gopakumar, centre for electronics design and technology, iisc bangalore. You can also get course completion certification for some of the courses.
Field control of series motor, motoring and braking of separately excited and series dc motors. The motors are small and are extremely powerful for the size. The dc motor or direct current motor works on that principal. Brushless dc motors page 12 8 determined by the inverter supply to the motor. 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. Working or operating principle of dc motor electrical4u. The operation of this type of device dc motor is reversible if the load opposes the rotation movement the load is said to be resistive, the device provides a torque and operates as a motor if the load is such that it tends to make the device rotate the load is said to be driving or it opposes the slowdown. Dc motors although ac motors are used in most of the cases, dc motors have many applications and used for multipurpose applications. If a company wanted to have reliable production, it should stick with known, proven. Nptel, iit, lectures, courses, video, engineering, online, video lectures, nptelhrd, iisc. Advanced electric drives video course electrical engineering nptel. It is one kind of dc motor which can be inbuilt with a permanent magnet to make the magnetic field necessary for the electric motor operation.
This type of dc motor provides great starting torque and has good speed regulation, but torque is limited so they are typically found on low horsepower applications. These motors are ideally suited for hightorque applications because the current in both the stator and armature increases under load. A force is induced in a conductor that has a current going through it and placed in a magnetic field any dc machine can act either as a generator or. Dc motor introduction, principle and working my tech info. Advanced electric drives online course video lectures by. Electrical brushless dc motor introduction, working and. Electrical engineering industrial drives power electronics nptel.
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. When a current carrying conductor is placed in a magnetic field, it experiences a torque and has a tendency to move. The armature is placed in between north pole and south pole of a permanent or an electromagnet as shown in the diagram above. Mod01 lec40 lecture40characteristics of compound dc series motors freevideolectures aim to help millions of students across the world acquire knowledge, gain good grades, get jobs. The permanent magnet motor uses a permanent magnet to create field flux. Nptel electrical engineering video lecture online study material. The simple understanding of concepts and design of dc. Generalized theory and krons primitive machine model modeling of dc machines modeling of induction machine modeling of synchronous machine reference frame theory and per unit system control of induction motor drive scalar control of induction motor principle of vector control and field orientation sensorless control and flux observers direct torque and flux control.
An electric motor is an electrical machine which converts electrical energy into mechanical energy. 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. Generally, dc compound motor is a hybrid component of dc series and shunt motors. Introduction, dc dc converters, adjustible speed drives 34. According to the most common industry naming conventions of today, there are three dc motor subtypes. Its operation is based on the principle that when a current carrying conductor is placed in a. Lecture 16 dc motor speed control introduction youtube. Basics of dc motors for electrical engineers beginners. The central computer controls the overall operation and coordination amongst the various constituents of the fms system. Video attached herewith gives an overview of a fms system figure 1. Nptel video lectures, iit video lectures online, nptel youtube lectures, free. In the first course, mainly the dc motor control both steady state and dynamic, and steady state torque and speed control of ac motors are.
Another name for a coil or loop of wire inductors oppose the change in current. Dc motor principle a machine that converts dc power into mechanical energy is known as dc motor. They include brushless dc motors stepping motors single phase motors the universal motors singlephase induction motors. Umanand, principal research scientist, power electronics group, cedt, iisc bangalore. Lecture 27 dc motors part 2 lecture 28 dc motors part 3 lecture 29 three phase system part 1. You will measure the angular velocity of your homebuilt motor and characterize a dc motor by measuring its motor constant. Induced voltage opposes applied voltage and limits current. Different types of electric motors and their applications. In the first course, mainly the dc motor control both steady state and dynamic, and steady state torque. The experiment in this video is the same one described in the dc motor annotated activity handout.
Figure 2 torquespeed curves for a separate field excitation motor. A commutatorbrushes arrangement helps in achieving unidirectional torque in a typical dc motor. Over 30 years ago, ac drives were considered new technology. Brushless dc motor is not a dc motor but a permanentmagnet synchronous machine. In the first course, mainly the dc motor control both steady state and dynamic, and steady state torque and speed control of ac motors are emphasized. Electrical engineering electrical machines i nptel. Mod01 lec36 lecture36characteristics of dc series motors. An emf voltage is induced in a conductor if it moves through a magnetic field. May 19, 2008 autoplay when autoplay is enabled, a suggested video will automatically play next. Here you can download the free lecture notes of power semiconductor drives pdf notes psd pdf notes materials with multiple files links to download. Electrical machinesi nptel online videos, courses iit video. Electrical machinesi nptel online videos, courses iit. The same dc machine can be used as a motor or generator. A drawback to swdc motors is that they do not have precise speed control like pmdc and shwdc motors have.
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. Nptel syllabus industrial drives power electronics video course 1. Single phase induction motor, theory of operation double. Nptel video lectures, iit video lectures online, nptel youtube lectures. That method is to change the terminal voltage of the motor. Dc brush motors, dc permanentmagnet pm motors, and dc universal motors. Massachusetts institute of technology department of electrical engineering and computer science 6. It doesnt matter whether its the brain freeze ice cream factory or joes garage.
Mod01 lec34 lecture34electronic control of dc shunt motors. Electrical energy conversion by converters, the lost history of the transistor, future electronic power distribution systems, basic strategies in power electronics, power devices, mechanical design and cooling techniques, dc dc converters, linecommutated topologies, voltage source inverters, active compensation. Electrical machines i online course video lectures by. Nptel transformers video lectures, electrical machines lectures, dc machines video, nptel video lectures, nptel online courses, youtube iit videos nptel courses. Basic electrical technology nptel online videos, courses. Starting of 3 phase induction motors, high starting torque motors, speed control, rheostatic method, pole changing method, cascade control of speed, double cage induction motor, cogging an d crawling of induction motor, induction generator. Motors serieswound serieswound brushed dc swdc motors have the field coil in series with the armature. Specialpurpose electric machines the machines introduced in this lecture are used in many applications requiring fractional horsepower, or the ability to accurately control position, velocity or torque. Nptel, iit electrical engineering video lectures, courses, classes, tutorials, training iit video courses and video lectures. Electric drive, controlled rectifier, power electronics improvements, dc to dc converter, ac to dc converterdesign, dc motor speed control, inverter current hysteresis controlled pwm, induction motor. Nptel video courses pack pdf format nptel user pack. A brushless dc motor or bldc motor is a type that is most suitable for applications that require high reliability, high efficiency, more torque per weight, etc. Power semiconductor drives pdf notes psd pdf notes. Nptel syllabus industrial drives power electronics.
Tech in electrical engineering iase deemed university. Download nptel handwritten notes of transformer download nptel handwritten notes of power. Mod01 lec21 lecture21operating principles of dc machines. 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. Please refer to this link to know more about pmdc motor. Therefore, theoretically, construction of a dc motor is same as that of a dc generator. Electrical engineering video lectures from nptel, iit, mit. Brushless dc motors nyu tandon school of engineering. What is common to all the members of this family is that the basic. Introduction, characteristics, adjustible speed drives 35. Other motor types compared to brushed dc motors and induction motors, bldc motors have many advantages and few disadvantages.
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. Basics of dc motors for electrical engineers beginners on photo. While the ac motor is less expensive and lighter weight, the dc motor has a simpler controller, making the dc motor controller combination less expensive. Advanced electric drives online course video lectures by iit. Brushed dc motor fundamentals microchip technology. Gopakumar, does not currently have a detailed description and video lecture title. If you have watched this lecture and know what it is about, particularly what electrical engineering topics are discussed, please help us by commenting on this video with your suggested description and tit.
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