Krishna vasudevan,department of electrical engineering,iit madras. Some of the more involved mathematical derivations are contained in appendices to this note. First consider that our uncompensated motor rotates at 0. Basics of dc motors for electrical engineers beginners on photo. Autoplay when autoplay is enabled, a suggested video will automatically play next. What is common to all the members of this family is that the basic. Brushes and commutator unlike other electric motor types i. Industrial drives power electronics electrical engineering. Mod01 lec21 lecture21operating principles of dc machines.
The system structure of a dc motor is depicted in figure22, including the. Nptel video lectures, iit video lectures online, nptel youtube lectures. The simple understanding of concepts and design of dc. As it was for a school project the following topics had to be covered. To rotate the bldc motor, the stator windings should be energized in a sequence. Apr 02, 2020 dc machines nptel notes edurev is made by best teachers of. Umanand, principal research scientist, power electronics group, cedt, iisc bangalore. Brushed dc bdc motors are inexpensive, easy to drive, and are readily available in all sizes and shapes. For example, the control of a rotary inverted pendulum requires a dc motor to drive the arm and the pendulum as shown in figure 21. A stepper motor or a step motor is a brushless, synchronous motor which divides a full rotation into a number of steps.
Unlike a brushed dc motor, the commutation of a bldc motor is controlled electronically. In other words, when a magnetic field and an electric field interact, a mechanical force is produced. This application note will discuss how a bdc motor works, how to drive a bdc motor, and how a drive. Debaprasad kastha, department of electrical engineering, iit kharagpur. These notes has been made by me after watching nptel lectures given by dr. Electrical machinesi nptel online videos, courses iit.
The electric motor operated by dc is called dc motor. Basic electrical technology basic electrical technology. 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 machinesi nptel online videos, courses iit video. 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. Among these, brushless dc motors bldc feature high efficiency and excellent controllability, and are widely used in many applications. Dc motors although ac motors are used in most of the cases, dc motors have many applications and used for multipurpose applications. The dc motor or direct current motor works on that principal. Brushed dc motor theory and operation chris joyce, shane skikne, evan simpson, james nee january 8, 2014 abstract this study looked into the e ect of changing the material within the rotor of an electric motor. In a brushed dc motor, the coils on the rotor utilize the motors magnetic eld. Stepper motors work on the principle of electromagnetism.
Industrial drives and power electronics free video lectures. Nptel video lecture topic list created by linuxpert systems. Nptel video lecture topic list created by linuxpert systems, chennaiget digimat digital media access terminal for highspeed video streaming of nptel. To understand the operating principle of dc motor we need to first look into its single loop constructional feature. Nptel provides elearning through online web and video courses various streams. Dc motor introduction, principle and working introduction. Another name for a coil or loop of wire inductors oppose the change in current. Then we will discuss how the machine geometry can be used to estimate both the elementary rating parameters and the parameters used to make more detailed estimates of the machine performance. In general, the torque generated by a dc motor is proportional to the armature current and the strength of the magnetic field. Nptel syllabus industrial drives power electronics video course 1. Dc motor introduction, principle and working my tech info. Electrical engineering electrical machines i nptel.
An905 ds00905bpage 2 2010 microchip technology inc. Download nptel handwritten notes of transformer download nptel handwritten notes of power. Speedtorque characteristics dc shunt, pmdc and series motors b. Electric drive, controlled rectifier, power electronics improvements, dc to dc converter, ac to dc converterdesign, dc motor speed control, inverter. Dc machine are the electromechanical energy conversion devices which converts either dc power to mechanical power or mechanical power to dc power.
Electrical machines i online course video lectures by iit. The direction of rotation of a this motor is given by flemings left hand rule. An old armature from a faulty hedge trimmer was used. It will also provide a list of the main parameters to consider, and some very important criteria that is most often overlooked.
Working or operating principle of dc motor electrical4u. Mod01 lec23 lecture23generated emf and torque in dc machines. Nov 10, 2014 autoplay when autoplay is enabled, a suggested video will automatically play next. 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. Up next synchronous reluctance motor intoduction concepts duration. The stepper motor can be controlled with or without feedback. Dc machines part 2 lecture 15 power factor lecture 25 dc generators lecture 22 the practical. Induced voltage opposes applied voltage and limits current.
Nptel industrial automation and control joshua lamorie. 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 transformers video lectures, electrical machines lectures, dc machines video, nptel video lectures, nptel online courses, youtube iit videos nptel courses. The red wire is the dc supply lead and must be connected to a dc voltage supply in the range of 4. There are two terminals, and when you apply direct current to one terminal and ground the other, the motor spins in one direction. Nptel video lectures, iit video lectures online, nptel youtube lectures, free video lectures, nptel online courses, youtube iit videos nptel courses. Nptel syllabus industrial automation and control video course 1. This video shows the characteristics of a dc motor.
Industrial drives and power electronics online course video. In this lesson well examine motor drives, power electronics devices that vary the speed and torque of a motor under its direction by varying the supplied voltage magnitude and frequency. Mod01 lec30 lecture30characteristics of dc shunt motors. 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. A motor converts supplied electrical energy into mechanical energy. 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, dcdc converters, linecommutated topologies, voltage source inverters, active compensation. It is based on freescales 56f800e microcontrollers. Electrical engineering video lectures from nptel, iit, mit.
Nptel provides elearning through online web and video courses various. Motor property 1 torque is proportional to current question. Dec 07, 2014 dc motor introduction, principle and working introduction. This video lecture, part of the series industrial drives. This document is highly rated by students and has been viewed 843 times. A direct current dc motor is an electric machine that converts electrical energy to mechanical energy. Gopakumar, does not currently have a detailed description and video lecture title. 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.
Mukhopadhyay, department of electrical engineering, iit kharagpur. Since the most basic requirement of a motor is that it should rotate at the desired speed, we will require that. An885 ds00885apage 2 2003 microchip technology inc. Dc brush motors, dc permanentmagnet pm motors, and dc universal motors. Dc motor speed control from mobile app engineers gallery. Open dc motor school project video here we have an open dc motor with permanent magnet for the field.
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. Dc motor principle a machine that converts dc power into mechanical energy is known as dc motor. Since majority of modern drives are ac motor drives, the course centers around the control of ac motor drives. 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. Introduction this application note describes the design of a 3phase ac induction motor drive with volts per hertz control in closedloop vhz cl. According to the most common industry naming conventions of today, there are three dc motor subtypes. System analysis page where the systems openloop response is simulated. Apr 01, 2008 lecture series on basic electrical technology by prof. Nptel video lecture topic list created by linuxpert systems, chennaiget digimat digital media access terminal for highspeed video streaming of nptel and educational video courses in lan. Introduction the servomotors used in industry today are used in a closedloop servo system. Brushless direct current bldc motors are one of the motor types rapidly gaining popularity. Unlike a brushless dc motor which rotates continuously when a fixed dc voltage is applied to it, a step motor rotates in discrete step angles. L umanand department of power electronics group, cedt iisc bangalore.
Fall 2005 ee595s electric drive systems 36 the plan continued achieving 14. Nptel syllabus industrial drives power electronics. Modeling of dc motor the most common device used as an actuator in mechanical control is the dc motor. This is an introductory lab designed to introduce you to the oscilloscope and matlab. Mod01 lec22 lecture22constructional features of dc machines. Nptel, iit electrical engineering video lectures, courses, classes, tutorials, training iit video courses and video lectures. Lecture series on industrial automation and control by prof.
Basics of dc motors for electrical engineers beginners. 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. Brushed dc motors are widely used in applications ranging from toys to pushbutton adjustable car seats. 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 title. Lecture series on basic electrical technology by prof. Fall 2005 ee595s electric drive systems 3 voltsperhertz control. This technical paper addresses basic motor sizing with simple calculations that can be done to generally size any motor application. In our projects is common to use dc motors in robotics, conveyor belts, in drones, among many other arduino projects and we want to make a test of dc motor speed control from mobile app using an application created in appinventor and will make a serial communication via a bluetooth module hc06 compatible with arduino. Fall 2005 ee595s electric drive systems 2 overview of strategies voltsperhertz control constant slip control fieldoriented control. The bldc motor has powersaving advantages relative to other motor types. Jul 11, 2019 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. All we need to do is to keep daxis stator current constant.
Learn for free, pay a small fee for exam and get a certificate. Introduction to industrial automation and control 2. Dc shunt motor armature the parallel combination of two windings is connected across a common dc power supply. Nptel, online courses and certification, learn for free. It is important to know the rotor position in order to understand which winding will be energized following the energizing sequence. 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. Two of these wires are to provide ground and positive supply to the servo dc motor.
The dc motor is the simplest of the motors discussed here. Nptel video lectures, iit video lectures online, nptel youtube lectures, free. Vf speed control of 3 phase induction motor using space. A dc motor is a mechanism that transforms electrical energy to mechanical energy. Its operation is based on the principle that when a current carrying conductor is placed in a. Finally, control aspects of some special motors, such as permanent magnet synchronous motor, brushless dc motor, switched reluctance motor, etc. Motor control suppose we wish to use a microprocessor to control a motor or to control the load attached to the motor. Types of dc motors dc motor are of 3 types they are 1. Single phase ideal transformer and basic equations.
Brushed dc motor fundamentals microchip technology. 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. You will measure the angular velocity of your homebuilt motor and characterize a dc motor by measuring its motor constant. Electrical machines i online course video lectures by. Motor engineer provides high level technical consulting services for the electric motor and generator design market worldwide. In a brushed dc motor, the coils on the rotor utilize the motors magnetic eld to create torque on the axle. Nptel video lecture topic list created by linuxpert.
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