Electrical Machines


Prof. G. Bhuvaneshwari

IIT Delhi

*Additional GST and optional Exam fee are applicable.

SKU: IIT Delhi Category:


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.


UG students and instructors


Basic Electrical Engineering, Circuit theory


Machines manufacturing and drives manufacturing industries like Kirloskar, ABB and Siemens


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.


Additional information



Total hours


Certification Process

1. Join the course
Learners may pay the applicable fees and enrol to a course on offer in the portal and get access to all of its contents including assignments. Validity of enrolment, which includes access to the videos and other learning material and attempting the assignments, will be mentioned on the course. Learner has to complete the assignments and get the minimum required marks to be eligible for the certification exam within this period.

COURSE ENROLMENT FEE: The Fee for Enrolment is Rs. 3000 + GST

2. Watch Videos+Submit Assignments
After enrolling, learners can watch lectures and learn and follow it up with attempting/answering the assignments given.

3. Get qualified to register for exams
A learner can earn a certificate in the self paced course only by appearing for the online remote proctored exam and to register for this, the learner should get minimum required marks in the assignments as given below:

Assignment score = Score more than 50% in at least 9/12 assignments.
Exam score = 50% of the proctored certification exam score out of 100
Only the e-certificate will be made available. Hard copies will not be dispatched.”

4. Register for exams
The certification exam is conducted online with remote proctoring. Once a learner has become eligible to register for the certification exam, they can choose a slot convenient to them from what is available and pay the exam fee. Schedule of available slot dates/timings for these remote-proctored online examinations will be published and made available to the learners.

EXAM FEE: The remote proctoring exam is optional for a fee of Rs.1500 + GST. An additional fee of Rs.1500 will apply for a non-standard time slot.

5. Results and Certification
After the exam, based on the certification criteria of the course, results will be declared and learners will be notified of the same. A link to download the e-certificate will be shared with learners who pass the certification exam.



Course Details

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.


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