EJ3310 Design of Magnetic Components for Power Electronics 8.0 credits

Konstruktion av magnetiska komponenter för effektelektronik

The course is intended mainly for PhD students whose research topic is within or related to power electronics or electrical drives. The course provides a deep understanding of combined magnetic, electric, and thermal design of inductors and transformers for power electronic applications.

  • Education cycle

    Third cycle
  • Main field of study

  • Grading scale

    P, F

Information for research students about course offerings

The course is suitable for PhD students at KTH but doctoral students from other universities can also apply.

The course is given when there is sufficient demand. Please contact the examiner if you are interested in taking the course.

Intended learning outcomes

After completion of the course the student shall be able to

• explain the impact of physical limitations (such as magnetic saturation) on the design of magnetic components

• explain how the skin and proximity effects influence the design of magnetic components

• explain the properties of wire windings, foil windings, and litz-wire windings

• explain the properties of different core materials like laminated sheet steel, ferrites, powder iron, amorphous alloys, and nanocrystalline materials

• explain the differences in different design methods like saturated thermally-limited design and non-saturated thermally-limited design

• explain the properties of dc inductors, hf inductors, and combined dc/hf inductors

• calculate main physical dimensions like air-gap length, core cross-sectional area, winding cross-sectional area

• calculate the peak flux density for different waveforms of voltage and current

• calculate inductances and parasitic capacitances of magnetic components

• calculate frequency-dependent resistances and core losses of magnetic components

• calculate approximate values of fringing permeances of gapped inductors

• describe the magnetic design procedure for magnetic components

• describe thermal design procedure for magnetic components

• describe electric breakdown in air, in solid insulation, and corona discharge

• describe basic, supplementary, and reinforced insulation systems

• describe how inductance, capacitance, and loss measurements are performed

• describe methods for loss minimization

Course main content

Methods for design and analysis of inductors and transformers for power electronics.


Seminars, lectures, project work, laboratory exercise, written examination.


PhD students at KTH and PhD students from other universities.


Alex Van den Bossche, Vencislav Cekov Valchev,
“Inductors and Transformers for Power Electronics”, CRC Press

Required equipment

Laboratory equipment is provided by the Laboratory of electrical energy conversion.


  • EXA1 - Examination, 8.0, grading scale: P, F

During the seminars the students should show that they are able to absorb the content of a section of the book and then present it in a professional way for the other students. The students should also show that they are capable of taking part in an advanced scientific discussion on the subject.

The project work is a design task where the whole content of the course is used. The result of the project work is evaluated in a laboratory exercise. The written examination is a standard examination with the grades P or F.

Requirements for final grade

·         At least one approved seminar with oral presentation

·         An approved project work on a design task

·         An approved laboratory exercise where the design is evaluated

An approved written examination.

Offered by

EECS/Electric Power and Energy Systems


Prof. Hans-Peter Nee


Hans-Peter Nee <hansi@kth.se>


Course syllabus valid from: Spring 2013.
Examination information valid from: Spring 2019.