Electrical Machines

By Prof. G.Bhuvaneshwari   |   IIT Delhi
Learners enrolled: 5788
The course introduces electrical machines - namely transformers, DC and AC rotating machines, which are, arguably, the most important components of energy and power conversion industry. Transformers, being static, are the easiest of electrical machines and hence they will be dealt with initially after introducing magnetic circuit fundamentals. DC and AC machines will be discussed after understanding the process of electromechanical energy conversion through a magnetic field. The efficiency, voltage regulation and characteristics of these machines will be discussed while they are functioning as generators. Further, their speed-torque characteristics, starting, braking, speed control and efficiency will be discussed while they function as motors. Every topic will include their applications in various power industries as well. INTENDED AUDIENCE: UG students and instructors PREREQUISITES: Basic Electrical Engineering, Circuit theory INDUSTRY SUPPORT: Machines manufacturing and drives manufacturing industries like Kirloskar, ABB and Siemens
Course Status : Ongoing
Course Type : Core
Duration : 12 weeks
Start Date : 18 Jan 2021
End Date : 09 Apr 2021
Exam Date : 25 Apr 2021
Enrollment Ends : 01 Feb 2021
Category :
  • Electrical, Electronics and Communications Engineering
  • Power Systems and Power Electronics
Level : Undergraduate

Course layout

Week 1: Introduction to Electrical machines, Review of single-phase and three-phase circuits, complex notation, power and power factor Week 2: Magnetic circuits and flux calculations: MMF, Flux, permeability, reluctance, Ferromagnetic materials, BH loop, hysteresis, Eddy current losses Week 3: Assignment No 1 and 2 on AC circuits & Magnetic Circuits Week 4: Transformers: Principle of operation, ideal and practical transformer, efficiency and voltage regulation, Open circuit, short circuit and Load tests. Auto-transformer and instrument transformers. Parallel operation. Three-phase transformer fundamentals. Week 5: Assignment No. 3 and 4 on single-phase and three-phase transformers Week 6: Electromagnetic energy conversion principles: Filed energy, co-energy, Torque & power calculations, singly excited and doubly excited machines. Week 7: DC machines: Generators and motors; Construction, Different types of DC machines, principle of operation, torque and emf equation, Characteristics of DC generators and motors, Starting Braking and Speed control of DC Motors. Week 8: 3-phase induction machines: Construction, Different types of rotors, principle of operation, revolving magnetic field theory, Equivalent circuit, Torque expression,3 Torque-speed Characteristics of induction motors, Starting Braking and Speed control. Week 9: Single-phase induction motor: Types, Construction, Principle of operation, equivalent circuit, Torque-speed characteristics Week 10: Assignment No. 6 & 7 Problems on DC Generators and motors Week 11: Single-phase induction motor: Types, Construction, Principle of operation, equivalent circuit, Torque-speed characteristics Week 12: Three-phase Synchronous Machines: Construction, Different types, principle of operation, EMF equation, winding factor, OCC, SCC and calculation of synchronous reactance, Equivalent circuit, Voltage regulation and efficiency, Motoring operation, Power and Torque expressions, PF control, V and inverted V Characteristics of synchronous motors, Starting Braking and speed control.

Books and references

1. Principles of Electrical machines and power Electronics by P.C.Sen, 2nd Edition, John Wiley 2. Electric Machinery by Fitzgerald, Kingsley and Umans, 6th Edition, McGraw Hill India. 3. Electric Machinery Fundamentals by S. Chapman, 5th Edition, McGraw Hill India.

Instructor bio

Prof. G.Bhuvaneshwari

IIT Delhi
Prof. Bhuvaneshwari has been working as a faculty member in the Department of Electrical Engineering IIT Delhi since 1997. She did her BE from College of Engineering, Guindy, Anna University and then completed her M.Tech and PhD from IIT Madras in 1987 and 1992 respectively. She worked as a lecturer in College of Engineering, Madras after which she was working for the electric utility company ComEd in Chicago, IL, USA before joining as a faculty member in IIT Delhi. She has more than 150 international and National journal and conference papers to her credit. She is Fellow of IEEE-USA, IETUK, IETE, IE(I) and a life member of ISTE. Her areas of interest are power electronics, electrical machines, drives, power quality, power conditioning and renewable energy.

Course certificate

The course is free to enroll and learn from. But if you want a certificate, you have to register and write the proctored exam conducted by us in person at any of the designated exam centres.
The exam is optional for a fee of Rs 1000/- (Rupees one thousand only).
Date and Time of Exams: 25 April 2021 Morning session 9am to 12 noon; Afternoon Session 2pm to 5pm.
Registration url: Announcements will be made when the registration form is open for registrations.
The online registration form has to be filled and the certification exam fee needs to be paid. More details will be made available when the exam registration form is published. If there are any changes, it will be mentioned then.
Please check the form for more details on the cities where the exams will be held, the conditions you agree to when you fill the form etc.


Average assignment score = 25% of average of best 8 assignments out of the total 12 assignments given in the course.
Exam score = 75% of the proctored certification exam score out of 100

Final score = Average assignment score + Exam score

YOU WILL BE ELIGIBLE FOR A CERTIFICATE ONLY IF AVERAGE ASSIGNMENT SCORE >=10/25 AND EXAM SCORE >= 30/75. If one of the 2 criteria is not met, you will not get the certificate even if the Final score >= 40/100.

Certificate will have your name, photograph and the score in the final exam with the breakup.It will have the logos of NPTEL and IIT Madras .It will be e-verifiable at nptel.ac.in/noc.

Only the e-certificate will be made available. Hard copies will not be dispatched.

Once again, thanks for your interest in our online courses and certification. Happy learning.

- NPTEL team

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