A new stator back iron design for brushless doubly fed machines

Salman Abdi Jalebi, Ehsan Abdi, Richard McMahon

Research output: Chapter in Book/Report/Conference proceedingConference proceeding

3 Citations (Scopus)

Abstract

The brushless doubly-fed machine (BDFM) has been under investigation in its modern forms for 50 years. The reason for this interest is the machine's ability to operate as a brushless variable speed motor or generator through the use of a partially-rated power electronic converter connected to its second stator winding. Interest has increased in the last 20 years because of greater penetration of wind turbines with Doubly-Fed induction Generators (DFIGs) where brush gear and slip-ring maintenance and reliability have been a major issue. The BDFM appears in two forms, the brushless doubly fed induction machine (BDFIM), with two stator windings and a third closed rotor winding or the brushless doubly fed reluctance machine (BDFRM), with two stator windings and a reluctance rotor with no winding. This paper sets out to provide a rotor-centric view of BDFM operation, which shows the basis of its rotating flux pattern, aligning it with the known Natural Speed, and clarifying the synchronous and induction modes of operation of the BDFIM and the synchronous BDFRM. Based on rotor-centric view of the BDFM, it is shown that the conventional design methods for the BDFM stator back iron can be modified, leading to a lighter and smaller machine. The proposed design concepts are supported by analytical methods and their practicality is verified using 2-D Finite Element (FE) modeling and analysis of three experimental BDFMs.
Original languageEnglish
Title of host publication2017 20th International Conference on Electrical Machines and Systems (ICEMS)
PublisherIEEE
Number of pages6
ISBN (Electronic)978-1-5386-3246-8, 978-1-5386-3245-1
ISBN (Print)978-1-5386-3247-5
DOIs
Publication statusPublished - 5 Oct 2017
Event2017 20th International Conference on Electrical Machines and Systems (ICEMS) - Sydney, Australia
Duration: 11 Aug 201714 Aug 2017
Conference number: 20
http://www.icems2017.org/

Conference

Conference2017 20th International Conference on Electrical Machines and Systems (ICEMS)
Abbreviated titleICEMS
CountryAustralia
CitySydney
Period11/08/1714/08/17
Internet address

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Keywords

  • brushless doubly-fed machine
  • brushless doubly-fed induction machine
  • brushless doubly-fed reluctance machine
  • electromagnetic theory
  • magneto-motive force
  • rotor winding
  • rotor reluctance
  • finite element analysis (FEA)
  • Stator windings
  • Rotors
  • Iron
  • Windings
  • Air gaps
  • Induction machines
  • asynchronous machines
  • brushless machines
  • finite element analysis
  • reluctance machines
  • stators
  • brushless variable speed generator
  • partially-rated power electronic converter
  • brush gear
  • BDFIM
  • third closed rotor winding
  • BDFRM
  • rotating flux pattern
  • 2D finite element modeling
  • 2D FE modeling
  • BDFM stator back iron design
  • brushless doubly fed machines
  • rotor-centric view
  • reluctance rotor
  • brushless doubly fed reluctance machine
  • closed rotor winding
  • brushless doubly fed induction machine
  • reliability
  • slip-ring maintenance
  • Doubly-Fed induction Generators
  • wind turbines
  • stator winding
  • power electronic converter
  • brushless variable speed motor
  • time 50.0 year
  • time 20.0 year

Cite this

Abdi Jalebi, S., Abdi, E., & McMahon, R. (2017). A new stator back iron design for brushless doubly fed machines. In 2017 20th International Conference on Electrical Machines and Systems (ICEMS) IEEE. https://doi.org/10.1109/ICEMS.2017.8056358