Saturation in Brushless Doubly-Fed Induction Machines

Tim Strous, Xuezhou Wang, Henk Polinder, Bram Ferreira

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientificpeer-review

9 Citations (Scopus)


The brushless Doubly-Fed Induction Machine (DFIM) has many advantages over the conventional DFIG commonly applied in wind turbines. However, due to the complex motion of the magnetic field in this machine type, the inclusion of nonlinear iron saturation in brushless DFIM models has been proven to be challenging. This paper combines a brushless DFIM Electric Equivalent Circuit (EEC) model with an analytical derived magnetic field model. The saturated magnetic field is iteratively obtained using the secant method. Saturation is included in the EEC model by introducing complex saturation factors derived from the magnetic field. This results in an EEC model that is able to accurately determine brushless DFIM operating characteristics. The model is validated by application to a case study machine and comparing the results with those derived from a finite element model.
Original languageEnglish
Title of host publication8th IET International Conference on Power Electronics, Machines and Drives (PEMD 2016)
Number of pages7
ISBN (Electronic)978-1-78561-189-6
ISBN (Print)978-1-78561-188-9
Publication statusPublished - 2016
EventPEMD 2016: 8th International Conference on Power Electronics - Glasgow, United Kingdom
Duration: 19 Apr 201621 Apr 2016


ConferencePEMD 2016
Abbreviated titlePEMD 2016
Country/TerritoryUnited Kingdom


  • Brushless Doubly-Fed Machine (BDFM)
  • FE modelling
  • Harmonics
  • Magnetic Field model
  • Saturation


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