Harmonics study of nested-loop rotors in brushless doubly-fed induction machines

Xuezhou Wang, Tim Strous, Domenico Lahaye, Henk Polinder, Bram Ferreira

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

6 Citations (Scopus)


Brushless doubly-fed induction machines (DFIMs) can be potential variable-speed generators for off-shore wind turbine applications. This special machine has two stator
windings with different pole-pairs. There is no direct magnetic coupling between two stator windings. A unique nested-loop rotor is designed to couple both stator windings. However, it results in lots of undesired space-harmonics in the airgap fields compared to conventional induction machines. There are few papers working on the design of nested-loop rotors. To design a better rotor, it is important to understand the complicated magnetic coupling in brushless DFIMs. This paper analyzes the space-harmonics and time-harmonics to provide a better understanding of the magnetic cross-coupling through the nested-loop rotor. The harmonic analysis is validated by FEM simulation and by taking measurements on a prototype in simple induction operation mode.
Original languageEnglish
Title of host publicationProceedings - 2016 International Conference on Electrical Machines
Place of PublicationPiscataway, NJ
Number of pages7
ISBN (Electronic)978-1-5090-2538-1
ISBN (Print)978-1-2090-2539-8
Publication statusPublished - 2016
Event2016 XXII International Conference on Electrical Machines (ICEM) - Lausanne, Switzerland
Duration: 4 Sept 20167 Sept 2016


Conference2016 XXII International Conference on Electrical Machines (ICEM)


  • brushless
  • cross-coupling
  • doubly-fed
  • induction machine
  • nested-loop
  • space-harmonics
  • simple induction mode
  • time-harmonics


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