Control of Electronically Commutated Motors

Higher education teachers: Nemec Mitja
Credits: 5
Subject code: 64832

Subject description


  • Fundamentals of Electric Machines,
  • Fundamentals of Power Electronics,
  • Fundamentals of Control Systems.

Content (Syllabus outline):

Principle of operation and modeling of the brush-less permanent magnet motor. Principle of operation and modeling of the switched reluctance motor. Principle of operation of the unipolar, bipolar and bifilar wound stepper motor. Bridge, half-bridge and asymmetric switched-mode power converter topologies with different number of switches for power supply of brush-less motor. 120° el. and 180° el. angle switch-on control mode of brush-less motor. Optimization of brush-less motor control algorithm by magnetic flux weakening method and the modification of the switch-on angle. Optimization of torque-speed characteristic. Methods for cogging torque reduction. Sensors for position and speed detection of the rotor. Sensorless control of brush-less motors. Phase current control. Design and implementation of rotor speed and motor torque controllers.

Objectives and competences:

The objective of the course is to equip students with knowledge of modern control principles of brush-less permanent magnet and switched reluctance motors. Special attention will be given to current, speed and torque control algorithms of brush-less motors in order to achieve optimal parameters of the electric motor drive. Students will be able to design a control algorithm and to select an appropriate type of switch-mode power converter for a brush-less motor drive.

Intended learning outcomes:

Student will be able to design advanced electrical drives based on electronically commutated electric machines and high efficient power electronic converters.

Learning and teaching methods:

  • Written exam,
  • individual project evaluation.

Study materials

  1. B. K. Bose, Modern Power Electronics and AC Drives, Prentice Hall, 2002
  2. R. Krishnan, Switched Reluctance Motor Drives, CRC Press, 2001
  3. P. C. Krause, O. Wasynczuk, S. D. Sudhoff, Analysis of Electric Machinery and Drive Systems, John Wiley & Sons, 2002
  4. F. L. Luo, H. Ye, Advanced DC/DC converters, CRC Press, 2004
  5. D. Ibrahim, Microcontroller Based Appliied Digital Control, John Wiley & Sons, 2006
  6. J. M. Miller, Propulsion Systems for Hybrid Vehicles, The institution of Electrical Engineers IEE, London, 2004
  7. R. Doncker, D. Pulle, A. Veltman, Advanced in Electrical Drives, Springer, 2011
  8. P. Wach, Dynamics and Control of Electrical Drives, Springer, 2011
  9. K. Sozanski, Digital Signal Processing in Power Electronics Control Circuits, Springer, 2013