Electromechanical Energy Conversion

Learning Outcomes

  1. Describe the operating principle of rotating electrical machines
  2. Derive basic mathematical equation according to general theory of electrical machines
  3. Apply the general model of electrical machine for various types of machines
  4. Analyze steady state operating conditions of various types of electrical machines
  5. Relate classical theory of electromagnetic fields to operating principle of electrical machines

Forms of Teaching


Lectures take place in two cycles: the first 7 weeks at 3 hours and another 6 weeks, 3 hours per week.


Exercises are held 13 weeks per 1 hour.


Laboratory exercises consist of three exercises, each lasting for 5 hours.

Grading Method

Continuous Assessment Exam
Type Threshold Percent of Grade Threshold Percent of Grade
Laboratory Exercises 50 % 15 % 50 % 15 %
Mid Term Exam: Written 50 % 30 % 0 %
Final Exam: Written 50 % 30 %
Final Exam: Oral 25 %
Exam: Written 50 % 50 %
Exam: Oral 35 %

Week by Week Schedule

  1. Physical fundamentals of electromechanical energy conversion; Force on a conductor; Faraday's law; Lenz's law; Energy balance of electromechanical system.
  2. Maxwell's stress tensor; Principle of virtual work; Kron's general model of electrical machine; Conditions for electromechanical conversion.
  3. Static and dynamic conditions of electromechanical system; Two-axis theory of electrical machines.
  4. Basic principle of operation and main parts of DC machines; Types of DC machines.
  5. Steady-state model of a DC machine; External characteristics of DC motors and generators.
  6. Starting, braking and speed control; Armature reaction; Commutation; DC winding.
  7. Linear current density; Magnetomotive force; Magnetomotive force of AC and multiphase excitation.
  8. Midterm exam.
  9. Winding of AC machines; Winding function; Winding inductances.
  10. Developed torque; Induced voltage.
  11. Basic principle of operation of induction machine; Construction; Windings.
  12. Equivalent circuit; Energy balance.
  13. No-load and short-circuit test; Equivalent circuit parameters; Torque characteristic.
  14. Techniques for starting induction motors; Speed control of the motor on power grid and power converter.
  15. Final exam.

Study Programmes

University undergraduate
Control Engineering and Automation (module)
(5. semester)
Electrical Engineering and Information Technology (study)
(5. semester)


R.Wolf (1995.), Osnove električnih strojeva, Školska knjiga, Zagreb
Stephen Umans, A Fitzgerald, Charles Kingsley (2013.), Electric Machinery, McGraw-Hill Higher Education
Stephen J. Chapman (2012.), Electric Machinery Fundamentals, McGraw-Hill Medical Publishing


Laboratory exercises


ID 183419
  Winter semester
L1 English Level
L1 e-Learning
45 Lectures
15 Exercises
15 Laboratory exercises
0 Project laboratory

Grading System

87.5 Excellent
75 Very Good
62.5 Good
50 Acceptable