FEJ3222 Introduction to AC Machine Analysis 7.5 credits

Introduktion till elmaskinanalys

Apart from representing a cornerstone in a wide range of industrial applications, induction and permanent-magnet machines are now an important part of environmentally friendly transport and energy production solutions. Since electric machinery has been around for close to 200 years, the related theory is well developed and represents an important and interesting application of the low-frequency approximation of Maxwell’s equations.

The aim of this course is to present an introduction to the theory of ac machine analysis at a somewhat more fundamental level than what is found in undergraduate/graduate-level courses. Hence, while the topics covered are commonly covered in an introductory course, focus is here put on model derivations in order to obtain a deeper level of understanding. After the course, the student should be well fit to apply the theory as well as to consult relevant research literature in order to further extend their knowledge.

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 induction and permanent machinery:

·         The magnetomotive force concept and its applications in electric machinery

·         Fundamental and harmonic winding factors

·         A thorough derivation of the equivalent-circuit induction machine model

·         Electromagnetic sizing of induction machines using the progressive rotor growth concept

·         An introduction to the finite element method applied to electric machinery

·         The dq transformation: machine modeling, voltage current constraints, impact of zero sequence

·         Magnetic saturation, cross saturation and impact of flux-linkage harmonics

·         Transient permanent-magnet machine models utilizing FEM data

·         The heat equation

·         Newton’s and Fourier's cooling laws

·         A model for predicting equivalent thermal conductivity of stator slots using the theory of two-component composite materials

·         Air-gap heat transfer

·         Lumped-parameter thermal modeling

Intended learning outcomes *

After completion of the course the student shall be able to:

·         Analyze induction and permanent-magnet machines using analytical methods and the finite element method

·         Carry out a preliminary electromagnetic sizing of an industrial induction machine

·         Carry out thermal analysis of electric machinery using methods based on the finite element method and a lumped parameter approach

·         Implement a finite-element based solver in a Matlab environment

Course Disposition

No information inserted

Literature and preparations

Specific prerequisites *

PhD students at KTH, PhD students from other universities

Recommended prerequisites

No information inserted

Equipment

No information inserted

Literature

No information inserted

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.

    The examination consists of five project works where the student demonstrates that he/she has obtained the necessary knowledge to verify the models and methods described in the course literature. The results shall then be compiled into five written project reports clearly showing how the models have been implemented together with comments on the obtained results. The projects and the associated project reports should be carried out individually. 

    Other requirements for final grade *

    Five approved project reports. A project report is deemed approved (by the course examiner) if all tasks have been solved and given a clear account for.

    Opportunity to complete the requirements via supplementary examination

    No information inserted

    Opportunity to raise an approved grade via renewed examination

    No information inserted

    Examiner

    Oskar Wallmark

    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 FEJ3222

    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

    Contact

    Oskar Wallmark, oskar.wallmark@ee.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