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Design of Electric Motor

By Prof. Prathap Reddy   |   IISc Bangalore
Learners enrolled: 1119   |  Exam registration: 18
ABOUT THE COURSE:
Electrical machines are the driving force for the modern world in one or another way. The main objective of this course is to understand the design of electrical machines with respect to different applications. This course starts with the principle of the electromagnetics and design of electromagnets. Once the students are familiar with the electromagnetic principle, the realization of the electrical machines and winding designs will be discussed. Afterwards, the generic design of rotating machines with respect to sizing equations, Winding volume product, electric loading, magnetic loading and geometrical construction and density will be discussed. Further, the design of induction machines switched reluctance machines and thermal design procedure for electrical machines will be discussed in detail.

INTENDED AUDIENCE: Electrical Engineering students

PREREQUISITES: Basics of Electrical Machines and Electromagnetics

INDUSTRY SUPPORT: All Electric Motor Companies and EV Companies
Summary
Course Status : Upcoming
Course Type : Elective
Language for course content : English
Duration : 12 weeks
Category :
  • Electrical, Electronics and Communications Engineering
  • Power Systems and Power Electronics
Credit Points : 3
Level : Undergraduate/Postgraduate
Start Date : 21 Jul 2025
End Date : 10 Oct 2025
Enrollment Ends : 28 Jul 2025
Exam Registration Ends : 15 Aug 2025
Exam Date : 01 Nov 2025 IST
NCrF Level   : 4.5 — 8.0

Note: This exam date is subject to change based on seat availability. You can check final exam date on your hall ticket.


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Course layout

Week 1: Review of Magnetic Circuits

History Prospect of Electrical Machines, Electric Fields, Magnetic Fields, Review of Electromagnetic laws, Electric and Magnetic Circuits Interface, Magnetic Materials and Concepts of BH Curves.

Week 2: Review of Magnetic Circuits-II

Magnetic Circuits with and without Air gaps, Multiple Winding Magnetic Circuits and Permanent Magnets, Force Equations in Electromagnetic Systems, Design of Electromagnetic Systems.

Week 3: Rotating Electrical Machines

Realization of Electrical Machines with the Principles of Electromagnets, Working Principles of the Rotating Machines, Magnetic Fields in AC and DC Machines.

Week 4: Rotating Machine Windings

DC Machine Windings, AC Machine Windings

Week 5: Variable Pole Machines and Generalized Theory for Design of Electrical Machines-I

Winding Design for Variable Speed Machines, Importance, Design factors and Standards of the Electrical Machines, Sizing Equations with D2L (Volume) Product

Week 6: Generalized Theory for Design of Electrical Machines-II

AC Machine Windings Examples with Laboratory Prototype, Sizing Equations with D3L (Volume) Product, Volume, Power Density, Induction Motor (IM) Design, Main dimensions, Analysis of Copper Function and Output Function w.r.t the Electric Machine D3L Product Equation

Week 7: Induction Motor Design-I

Design Procedure of an Electric Machine, Name Plate Details and Datasheets of Induction Motor, Stator Core Design of IM.

Week 8: Induction Motor Design-II

Rotor Design: Slots Selection, Rotor MMF and Bar Currents, Geometry, Resistance of Rotor Windings

Week 9: Induction Motor Design-III

Carter's Coefficient of Electrical Machines, Stator MMF and Magnetizing Current Equations, Inductances and Equivalent Circuit Parameters of Induction Machine

Week 10: Switched Reluctance Machine Design-I

Loss Calculation of Induction Machine, Sizing Equations-Output Power and Volume (D2L) Product Equation, Stator and Rotor Design of SRM

Week 11: Switched Reluctance Machine Design-II and Thermal Design of Electrical Machines-I

Procedure for Calculation of SRM Inductance, Efficiency Calculations of SRM, Importance of Thermal Design and Thermal Limits for Electrical Machines, Electric and Thermal Circuits Interface, Heat Flow in Electrical Machines

Week 12: Thermal Design of Electrical Machines-I I

Cooling Methods and Standards for Electrical Machines, Thermal Equivalent Circuits of Electrical Machines

Books and references

  • Thomas A. Lipo, Introduction to AC Machine Design, IEEE Press, John Wiley & Sons, Inc., NJ, USA.
  • Alexander Gray, Electrical Machine Design - The Design And Specification Of Direct And Alternating Current Machinery, Mc Graw Hill, NY, USA.
  • Krishnan, R., Switched Reluctance Motor Drives: Modeling, Simulation, Analysis, Design, and Applications, CRC Press, USA.
  • Juha Pyrhonen, Tapani Jokinen, Valeria Hrabovcova, Design of Rotating Electrical Machines, Second Edition, John Wiley & Sons Ltd, West Sussex, UK.
  • A. K. Sawhney, “A Course in Electrical Machine Design”, Dhanpat Rai and Sons, 1970.

Instructor bio

Prof. Prathap Reddy

IISc Bangalore
Dr. B. Prathap Reddy is currently working as an Assistant Professor at the Department of Electrical Engineering, Indian Institute of Technology (IIT) Indore. He has worked as a DST Inspire Faculty at the Department of Electronic Systems Engineering (DESE) at Indian Institute of Science (IISc), Bengaluru, from Jul 2021 to Dec 2023. He received the PhD degree in Power Electronics and Drives from the Indian Institute of Technology Hyderabad, India, in 2019. He did a research internship at Nissan Motor Co., Ltd, Japan from Dec 2017 to Feb 2018. He received the INAE Young Engineer Award for the year 2022 from INAE, India, and has been an INAE Young Associate since 2022. The research interests are in Magnet-less Machine Design, Multiphase Machines, Pole Phase Modulated Machines, Electric Vehicles, Electrical Drives, Power Electronics, EV Charging Solutions, Multilevel Inverters, Converter Design and Analysis.

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: November 01, 2025 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.

CRITERIA TO GET A CERTIFICATE

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

Please note that assignments encompass all types (including quizzes, programming tasks, and essay submissions) available in the specific week.

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 IISc Bangalore. 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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