Derivation of equivalent circuit rotor current from rotor bar current measurements in brushless doubly-fed machine

Ehsan Abdi, Salman Abdi, Richard McMahon, Peter Tavner

Research output: Contribution to journalArticlepeer-review


This paper presents a method to estimate the BDFM equivalent circuit rotor current from rotor bar current measurements. Rotor currents are measured using a specially designed hardware that incorporates Rogowski coils and Bluetooth wireless transmission. The measurement of rotor currents enables the parameters in the BDFM's full equivalent circuit to be extracted unambiguously. In particular, stator and rotor leakage inductances can be estimated from experimental tests, which was not possible before from terminal measurement. The method is presented for a nested-loop rotor design and experimental measurements are shown for a prototype D180 frame BDFM.
Original languageEnglish
JournalIEEE Transactions on Energy Conversion
Publication statusPublished - 2 May 2024


  • Bars
  • Brushless doubly-fed machine
  • Current measurement
  • Curve fitting methods
  • Equivalent circuit model
  • Equivalent circuits
  • Integrated circuit modeling
  • Nested-loop rotor
  • Rogowski coils
  • Rotor current measurements
  • Rotors
  • Stator windings
  • Wind energy
  • Windings

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