Equivalent Circuit Parameters for Large Brushless Doubly Fed Machines (BDFM)

Salman Abdi Jalebi, Ehsan Abdi, Ashknaz Oraee, Richard McMahon

Research output: Contribution to journalArticle

28 Citations (Scopus)
16 Downloads (Pure)


This paper presents analytical methods to calculate the equivalent circuit parameters for large-scale brushless doubly fed machines (BDFMs) with magnetic wedges utilized for closing stator open slots. The use of magnetic wedges reduces the magnetizing currents in the machine, reflected in the values of magnetizing inductances, but also increases leakage fluxes affecting the value of series inductances in the equivalent circuit. Though such effects can be modeled by numerical models, the proposed analytical methods are particularly helpful in optimizing machine design, inverter rating, reactive power management, and grid low-voltage ride-through performance. The conventional analytical methods cannot be readily applied to the BDFM due to its complex magnetic field distribution; this paper presents analytical methods to calculate the magnetizing and leakage inductances for the BDFM with magnetic wedges used in the stator slots. The proposed methods are assessed by experimentally verified finite-element models for a 250 kW BDFM.
Original languageEnglish
Pages (from-to)706-715
Number of pages10
JournalIEEE Transactions on Energy Conversion
Issue number3
Early online date17 Apr 2014
Publication statusPublished - Sep 2014

Bibliographical note

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  • Saturation magnetization
  • Magnetic circuits
  • Stator windings
  • Equivalent circuits
  • Integrated circuit modeling
  • Rotors
  • Brushless doubly fed machine (BDFM)
  • carter factor
  • coupled-circuit model
  • finite-element (FE) method
  • inductance calculation
  • magnetic wedges
  • magnetomotive force (MMF)

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