Master Thesis - Modelling of rolling stock auxiliary transformers and inductors

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Master Thesis - Modelling of rolling stock auxiliary transformers and inductors



At Bombardier Transportation, our trains and rail solutions move millions of people safely and reliably around the world, every single day. Join us, and you’ll be part of a global team, sharing knowledge, experience and ideas across countries and cultures, and boosting our reputation as a global leader in rail technology. Your work will have a truly human impact, connecting communities, cities and businesses, and helping people to get where they need to be. It’s all about progress.

If you’re ambitious, driven and team-spirited Master student, this is your opportunity to build a Model of rolling stock auxiliary transformers and inductors. Based in Stockholm, Sweden.


  • To save development time Bombardier Transportation is striving for applying Model Based Design, but so far we lack a three phase transformer model that can reproduce the true couplings between phases.


  • The main objective of the master’s thesis is to develop an advanced three phase transformer circuit model in MATLAB - Simulink/Plecs for use in Model Based Design of auxiliary converters.
  • The project will consist in the following tasks:
    • - Develop circuit models of both a three phase transformer and a three phase inductor in Matlab-Simulink/Plecs, including phenomena like common mode and differential mode inductance and preferably also core saturation, hysteresis and frequency dependent winding losses.
    • - Tune the model using real data from our transformer supplier, perhaps also from your own measurements in our Power Lab.
    • - Using this model to study various topics of our railway rolling stock auxiliary converters, e. g. results of unsymmetrical load, resonances on three phase buses fed from multiple converters and loss optimization.
  • If the student shows good interest towards research publication there is possibility to publish limited information.



  • Prerequisites: Electrical Engineering, Electric Power Engineering or Engineering
  • Physics program including courses in electromagnetics and Matlab modelling.
  • Additional Matlab programming experience or courses in power electronics is a plus.

Bombardier is committed to creating a diverse environment and is proud to be an equal opportunity employer. All suitably qualified applicants will receive consideration for employment without regard to race, colour, religion, gender, gender identity or expression, sexual orientation, national origin, genetics, age, disability status, veteran status, or any other characteristic protected by Federal, National, or Local Laws.

In case of equal qualification, severely disabled persons employed in the company are to be given priority over other applicants when filling jobs suitable for them.

Job: Engineering

Primary Location: SE-STM-Stockholm

Organization: Transportation

Schedule: Full-time

Employee Status: Limited Term



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