Electrical Drives

Subject description

Basic components of electrical drives. Overview of the electrical drives field, brief history, present state and future trends.

Static and dynamic operation, characteristics of motors and loads, dynamic torque. Electrical and mechanical transient states, condition for static stability of drive systems. Design of electrical motors, commissioning, housing types, cooling, connections to the supply.

Electrical motors: induction motor (slip ring and squirrel cage), synchronous motor (with excitation winding or permanent magnet), reluctance motor, dc brush motor, dc brushless motor. Static and transient characteristics, problems during start-up and braking, speed control. Semiconductor converters for dc and ac drives and their control.

Methods for correct selection of electrical motors, dimensioning, thermal characteristics, duty cycles. Principles of energy efficient electrical motors nad drives, operation with high efficiency and power factor.

Special electrical drive systems: traction systems (drives in rail and automotive applications), electrical shafts, crane drives, linear motor drives, ultra speed drives.

Protection of electrical drives – disturbances from the load and supply, classical protection techniques, modern approach – on-line condition monitoring and supervision with applied detection and diagnostic techniques.

The subject is taught in programs

Electrical engineering 1st level

Objectives and competences

To acquire knowledge and procedures to succesfully design, dimension, operate and maintain different types of electrical drives in industrial and transportation systems.

Teaching and learning methods

The lectures provide a theoretical background on discussed topics. A complete study material is available to the students.

Successful practical work on laboratory excercises, which take place in smaller groups, enables prior acquaintance of the students with computational and demo tasks.

Expected study results

After successful completion of the course, students should be able to:

– Describe state-of-the-art and perspectives of electrical drives.

– Explain the difference between constant and variable speed electrical drives and their main components.

– Clarify physical operational principles of basic drive types.

– Explain in details behaviour of electrical motor and mechanical load connection.

– Research the influence of control parameters on static and dynamic characteristics of drive motors.

– Estimate the importance of energy efficiency operation of controlled electrical drives.

– Recognize the significance of reliability and safety in drive operation.

– Manipulate with modern types of electrical drives which are most used in industry practice.

Basic sources and literature

  1. R. Fišer, Interno študijsko gradivo v pisni in elektronski obliki.
  2. D. Shroder, Elektrische Antriebe – Grundlagen mit Ubungs und Prufungsaufgaben, Springer, 2014.
  3. A. Hughes, B. Drury, Electric Motors and Drives – Fundamentals, Types and Applications, Elsevier, 2013.
  4. N. Mohan, Electric machines and Drives – A First Course, Wiley, 2012.
  5. M. Barnes, Practical Variable Speed Drives and Power Electronics, Newnes, 2003.
  6. B. Drury, The Control Techniques Drives and Controls Handbook, IET, 2009.
  7. N. Srb, Elektromotori i elektromotorni pogoni, Graphis, Zagreb, 2007.
  8. R. Mansius, Praxishandbuch Antriebsauslegung – Grunlagen, Formelsammlung, Beispiele, Vogel Fachbuch, 2012.

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University of Ljubljana, Faculty of Electrical Engineering Tržaška cesta 25, 1000 Ljubljana

E:  dekanat@fe.uni-lj.si T:  01 4768 411