Comparative Electromagnetic Analysis of Bar Cage and Nested-Loop Rotors in Brushless Doubly Fed Machines

Heidary, Malihe ORCID: https://orcid.org/0000-0001-6249-1237, Abdi, Salman, Abdi, Ehsan and McMahon, Richard (2026) Comparative Electromagnetic Analysis of Bar Cage and Nested-Loop Rotors in Brushless Doubly Fed Machines. In: UNSPECIFIED.

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Abstract

The brushless doubly fed machine (BDFM) has emerged as a promising alternative to the conventional doubly fed induction generator (DFIG) for variable-speed wind energy conversion systems. It provides comparable performance with enhanced reliability and reduced maintenance requirements by eliminating brushes and slip rings through its special rotor design. Among the rotor topologies proposed for BDFMs, the nested-loop and bar cage designs have attracted significant research interest due to their robust construction and reduced flux leakage and losses. In this paper, two BDFMs with identical stator structures and electrical parameters are investigated, differing only in their rotor configurations: one employing a nested-loop rotor and the other a bar cage rotor. The machines are analysed under synchronous operating condition, where the rotor loop currents, air gap magnetic field distribution, and its harmonic content obtained via fast Fourier transform (FFT) are evaluated. Furthermore, the electromagnetic torque ripple obtained from finite element (FE) simulations is analysed and compared for the two rotor configurations. The results provide valuable insight into the electromagnetic behaviour of each rotor topology under synchronous operation mode, and highlight the advantages of the bar cage rotor over the nested-loop structure.

Item Type:	Conference or Workshop Item (Paper)
Uncontrolled Keywords:	das to be completed,2026 ,/dt/atira/pure/keyword/DAStatement/das_to_be_completed
Faculty \ School:	Faculty of Science > School of Engineering, Mathematics and Physics
UEA Research Groups:	Faculty of Science > Research Groups > Sustainable Energy
Depositing User:	LivePure Connector
Date Deposited:	10 Nov 2026 16:10
Last Modified:	10 Nov 2026 16:10
URI:	https://ueaeprints.uea.ac.uk/id/eprint/105047
DOI:	10.1109/ICEM68283.2026.11757652

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