FEJ3310 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.

Offering and execution

Course offering missing for current semester as well as for previous and coming semesters

Course information

Content and learning outcomes

Course contents *

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

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 Disposition

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

Literature and preparations

Specific prerequisites *

PhD students at KTH and PhD students from other universities.

Recommended prerequisites

No information inserted


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


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

Examination and completion

Grading scale *

P, F

Examination *

    Based on recommendation from KTH’s coordinator for disabilities, the examiner will decide how to adapt an examination for students with documented disability.

    The examiner may apply another examination format when re-examining individual students.

    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.

    Other 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.

    Opportunity to complete the requirements via supplementary examination

    No information inserted

    Opportunity to raise an approved grade via renewed examination

    No information inserted


    Hans-Peter Nee

    Further information

    Course web

    No information inserted

    Offered by

    EECS/Electric Power and Energy Systems

    Main field of study *

    No information inserted

    Education cycle *

    Third cycle

    Add-on studies

    No information inserted


    Hans-Peter Nee (hansi@kth.se)

    Ethical approach *

    • All members of a group are responsible for the group's work.
    • In any assessment, every student shall honestly disclose any help received and sources used.
    • In an oral assessment, every student shall be able to present and answer questions about the entire assignment and solution.

    Postgraduate course

    Postgraduate courses at EECS/Electric Power and Energy Systems