Design of Electrical Machines and Transformers

Course Description

Basic principles of design and construction of electrical machines. Design algorithm. Selection of electrotechnical materials for constructions of machines and devices. Determination of main dimensions of transformers, induction machines and synchronous machines. Calculation of magnetic circuit and electric machine parameters. Capability curves, losses and efficiency. Choice of the cooling method. Thermal equivalent circuit and basic calculation of heat distribution. Scaling laws in construction of electrical machines. Computer aided design. The application of 2D and 3D finite element method in the machine design. Principles of optimization in the design. The use of standards and regulations in the design process.

Learning Outcomes

  1. Describe the construction of transformers and rotating machines
  2. Identify cooling types, mechanical protection and construction of transformers and rotating machines
  3. Explain the principles of design and construction of electrical machinery
  4. Calculate the main dimensions of transformers and rotating machines
  5. Analyze the impact of selection of parameters and dimensions of an electric machine on the output characteristics
  6. Relate magnetic circuit characteristics with the parameters of an electric machine model

Forms of Teaching


classical lectures using blackboard in combination with PowerPoint slides

Seminars and workshops

electrical machine design project based on design requirements


solving numerical examples related to the content of the lectures

Partial e-learning

posting study materials and communicating with students through the course website. Moodle quizzes for self-study.


laboratory computer exercises

Grading Method

Continuous Assessment Exam
Type Threshold Percent of Grade Threshold Percent of Grade
Laboratory Exercises 20 % 35 % 20 % 0 %
Seminar/Project 50 % 35 % 50 % 35 %
Final Exam: Written 50 % 15 %
Final Exam: Oral 15 %
Exam: Written 50 % 35 %
Exam: Oral 30 %

Week by Week Schedule

  1. Design methods; Standards; Limits
  2. Methods for determination of main dimensions of electrical machines
  3. Calculation of nonlinear magnetic circuit of a rotating machine
  4. Design of electric machine windings
  5. Calculation of resistances and inductances, Calculation of losses and efficiency
  6. Calculation of temperature rise in various machine parts; Basic thermal model
  7. Basic calculation of mechanical stress
  8. Midterm exam
  9. Transformer - main dimensions and design features
  10. Turbogenerator - main dimensions and design features
  11. Hydrogenerator - main dimensions and design features
  12. Induction machine - main dimensions and design features
  13. Permanent magnet synchronous machine - main dimensions and design features
  14. Scaling laws and scaling of electric machines
  15. Final exam

Study Programmes


Juha Pyrhonen, Tapani Jokinen, Valeria Hrabovcova (2013.), Design of Rotating Electrical Machines, John Wiley & Sons
J. R. Hendershot, Timothy John Eastham Miller (2010.), Design of Brushless Permanent-magnet Machines,
Thomas A. Lipo (2017.), Introduction to AC Machine Design, John Wiley & Sons
M. Ramamoorty (1988.), Computer-Aided Design of Electrical Equipment, Ellis Horwood Limited
Z. Sirotić, V. Krajzl (1975.), Upute za proračun sinhronih strojeva, Sveučilište u Zagrebu

For students


ID 222748
  Winter semester
L1 English Level
L1 e-Learning
30 Lectures
15 Exercises
13 Laboratory exercises

Grading System

85 Excellent
70 Very Good
60 Good
50 Acceptable