Electric Servo Systems

Higher education teachers: Ambrožič Vanja
Collaborators: Nemec Mitja
Credits: 6
Semester: summer
Subject code: 64231

Subject description


  • Knowledge of mathematics, electrical engineering fundamentals, measurements, electrical machines.
  • Before taking the exam the student has to accomplish the laboratory exercises and to prepare the corresponding report.

Content (Syllabus outline):

Definition of servo drives, deficiencies of classical approaches, voltage/frequency supplying of AC machines. Control of converters and modulation approaches. Vector models of AC machines in comparison to DC machines, Field orientation theory, control of servo drives with induction, synchronous, electronically commutated and reluctance motors. Modern methods for open- and closed-loop control. Sensorless control. Discrete control and theory of MIMO systems in the area of servo drives. Microprocessors in servo drives.

Objectives and competences:

Getting to know servo drives, as basis for modern mechatronics, their complexity, and integration of components. Choosing the suitable motor.

Intended learning outcomes:

Knowledge and understanding:

  • The student will get acquainted with task performed by servo drives, possibilities and problems in its realization using different machines, and modern control techniques.
  • Application: Practical calculation and optimization of control loops through examples of different electrical drives. General modelling of discrete and multivariable systems.
  • Reflection: A comparison between ideal, theoretical, models and industrial drives in a real environment will be possible through simulations and testing.
  • Transferable skills: Use of information technologies: building up the simulation models of servo drives. Computational skills: calculation and optimization of control parameters.

Learning and teaching methods:

Lectures and mandatory laboratory exercises on simulation and experimental models.

Study materials


  1. Leonhard W.: “Control of Electrical Drives”, Springer, Berlin, 2001
  2. Bose B. K.: “Modern Power Electronics and AC Drives”, Prentice Hall, 2002
  3. Vas P.: “Sensorless Vector and Direct Torque Control”, Oxford University Press, Oxford, 1998

Study in which the course is carried out

  • 1 year - 2nd cycle - Electrical Engineering - Mechatronics