EJ2201 Electrical Machines and Drives 6.0 credits

Elektriska maskiner och drivsystem

The course focuses on electrical machines and their important role in modern society, e.g. as traction motors in electric vehicles and generators in hydro power stations.

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Offering and execution

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Course information

Content and learning outcomes

Course contents *

• physics of electromagnetism and electromechanical models applied to rotating electrical machines.
• principles of electromechanical energy conversion
• dc machines and drive systems
• rotating magnetic fields and ac windings
• space vector representation and reference frames
• operating principles of synchronous machines
• operating principles of induction (asynchronous) machines
• introduction to non-conventional electrical machines
• introduction to to three-phase drives.

Intended learning outcomes *

Having passed the course, the student shall be able to:
• describe the basic principles of electromechanical conversion
• explain the principles of rotating magnetic field generation through through the construction of AC windings
• explain the operating principles of dc machines, synchronous machines and induction machines
• use analytical models for describing the operation of dc machines, synchronous machines and induction machines
• use the space vector theory and the reference frame theory to describe the operation of ac machines
• describe the most important parts of a dc electric drive and a three-phase electric drive.

Course Disposition

No information inserted

Literature and preparations

Specific prerequisites *

Completed course EJ1200 Electric power systems, or the equivalent.

Recommended prerequisites

• Electrical circuit analysis (for example EI1110 Electrical circuit analysis, extended course or EI1120 Electrical circuit analysis for the energy and environment program)
• Electromagnetic theory (for example EI1220 Electromagnetic theory E or EI1225 Electromagnetic theory, introductory course for energy and environment)


No information inserted


P. Krause, O. Wasynczuk, S. D. Sudhoff, S. Pekarek, "Analysis of Electric Machinery and Drive Systems", Wiley-IEEE Press, 2013.

Examination and completion

If the course is discontinued, students may request to be examined during the following two academic years.

Grading scale *

A, B, C, D, E, FX, F

Examination *

  • LAB1 - Laboratory Work, 0.5 credits, Grading scale: P, F
  • PRO1 - Project Work, 1.5 credits, Grading scale: P, F
  • TEN1 - Written Exam, 4.0 credits, Grading scale: A, B, C, D, E, FX, F

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.

The final grade of the course is given by the grade of the written examination (TEN1).

In agreement with KTH's coordinator for disabilities, it is the examiner who decides to adapt an examination for students in possession of a valid medical certificate.. The examiner may permit other examination formats at the re-examination of individual students.

Opportunity to complete the requirements via supplementary examination

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Opportunity to raise an approved grade via renewed examination

No information inserted


Luca Peretti

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.

Further information

Course web

Further information about the course can be found on the Course web at the link below. Information on the Course web will later be moved to this site.

Course web EJ2201

Offered by

EECS/Electrical Engineering

Main field of study *

Electrical Engineering

Education cycle *

Second cycle

Add-on studies

EJ2120 Electric energy conversion, project course

EJ2222 Design of Electrical Machines

EJ2230 Control in Electrical Energy Conversion

EJ2311 Modulation of Power Electronic Converters

EJ2420 Seminars in Electrical Machines and Power Electronics

EJ2440 Electric Transportation


Oskar Wallmark

Supplementary information

Replaces EJ2200.

In this course, the EECS code of honor applies, see: