Fast rotor loss calculations in fractional-slot permanent magnet machines

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Permanent magnet machines with fractional slot windings are popular because of their shorter end windings, low cost and ease of manufacturing. On the other hand, fractional slot machines have higher eddy current losses in the rotor magnets and sleeve. An accurate calculation of these losses usually involves a time-stepped finite-element analysis with moving rotor, which is time consuming. This paper compares different methods of evaluating these losses using finite element analysis based on their time-cost. The models are mainly divided into two types: time-domain and frequency-domain models. The paper proposes an equivalent frequency-domain analysis in the stator frame for rotor loss calculations, using the Lorentz force term. This method yields similar results to the time-stepped finite element model with a significant time saving. The time saving can be significant in a machine optimization study.
Original languageEnglish
Title of host publicationProceedings 2018 XIII International Conference on Electrical Machines (ICEM)
Place of PublicationPiscataway, NJ, USA
ISBN (Electronic)978-1-5386-2477-7
ISBN (Print)978-1-5386-2478-4
Publication statusPublished - 2018
EventICEM 2018: 13th International Conference on Electrical Machines - Alexandroupoli, Greece
Duration: 3 Sept 20186 Sept 2018


ConferenceICEM 2018: 13th International Conference on Electrical Machines
Abbreviated titleICEM

Bibliographical note

Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project  
Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.


  • eddy current losses
  • Finite Element Analysis
  • Frequency-domain analysis
  • Lorentz force
  • permanent magnet machine
  • Time-domain analysis


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