A new stator back iron design for brushless doubly fed machines

Salman Abdi Jalebi; Ehsan Abdi; Richard McMahon

doi:10.1109/ICEMS.2017.8056358

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 proceeding › Conference proceeding › peer-review

6 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 language	English
Title of host publication	2017 20th International Conference on Electrical Machines and Systems (ICEMS)
Publisher	IEEE
Number of pages	6
ISBN (Electronic)	978-1-5386-3246-8, 978-1-5386-3245-1
ISBN (Print)	978-1-5386-3247-5
DOIs	https://doi.org/10.1109/ICEMS.2017.8056358
Publication status	Published - 5 Oct 2017
Event	2017 20th International Conference on Electrical Machines and Systems (ICEMS) - Sydney, Australia Duration: 11 Aug 2017 → 14 Aug 2017 Conference number: 20 http://www.icems2017.org/

Conference

Conference	2017 20th International Conference on Electrical Machines and Systems (ICEMS)
Abbreviated title	ICEMS
Country/Territory	Australia
City	Sydney
Period	11/08/17 → 14/08/17
Internet address	http://www.icems2017.org/

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

Access to Document

10.1109/ICEMS.2017.8056358

Cite this

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title = "A new stator back iron design for brushless doubly fed machines",

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.",

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",

author = "{Abdi Jalebi}, Salman and Ehsan Abdi and Richard McMahon",

year = "2017",

month = oct,

day = "5",

doi = "10.1109/ICEMS.2017.8056358",

language = "English",

isbn = "978-1-5386-3247-5",

booktitle = "2017 20th International Conference on Electrical Machines and Systems (ICEMS)",

publisher = "IEEE",

address = "United States",

note = "2017 20th International Conference on Electrical Machines and Systems (ICEMS), ICEMS ; Conference date: 11-08-2017 Through 14-08-2017",

url = "http://www.icems2017.org/",

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TY - GEN

T1 - A new stator back iron design for brushless doubly fed machines

AU - Abdi Jalebi, Salman

AU - Abdi, Ehsan

AU - McMahon, Richard

N1 - Conference code: 20

PY - 2017/10/5

Y1 - 2017/10/5

N2 - 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.

AB - 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.

KW - brushless doubly-fed machine

KW - brushless doubly-fed induction machine

KW - brushless doubly-fed reluctance machine

KW - electromagnetic theory

KW - magneto-motive force

KW - rotor winding

KW - rotor reluctance

KW - finite element analysis (FEA)

KW - Stator windings

KW - Rotors

KW - Iron

KW - Windings

KW - Air gaps

KW - Induction machines

KW - asynchronous machines

KW - brushless machines

KW - finite element analysis

KW - reluctance machines

KW - stators

KW - brushless variable speed generator

KW - partially-rated power electronic converter

KW - brush gear

KW - BDFIM

KW - third closed rotor winding

KW - BDFRM

KW - rotating flux pattern

KW - 2D finite element modeling

KW - 2D FE modeling

KW - BDFM stator back iron design

KW - brushless doubly fed machines

KW - rotor-centric view

KW - reluctance rotor

KW - brushless doubly fed reluctance machine

KW - closed rotor winding

KW - brushless doubly fed induction machine

KW - reliability

KW - slip-ring maintenance

KW - Doubly-Fed induction Generators

KW - wind turbines

KW - stator winding

KW - power electronic converter

KW - brushless variable speed motor

KW - time 50.0 year

KW - time 20.0 year

U2 - 10.1109/ICEMS.2017.8056358

DO - 10.1109/ICEMS.2017.8056358

M3 - Conference proceeding

SN - 978-1-5386-3247-5

BT - 2017 20th International Conference on Electrical Machines and Systems (ICEMS)

PB - IEEE

T2 - 2017 20th International Conference on Electrical Machines and Systems (ICEMS)

Y2 - 11 August 2017 through 14 August 2017

ER -

A new stator back iron design for brushless doubly fed machines

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Keywords

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