An Approach to Maximize Torque Density in a Brushless Doubly-fed Reluctance Machine

Shivang Agrawal, Alexander Province, Arijit Banerjee

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

Abstract

A brushless doubly-fed machine (BDFM) is an attractive option for megawatt-scale turbo-electric propulsion systems due to use of a partially-rated power converter, reduced maintenance, and absence of permanent magnets. However, the BDFM has inherently poor torque density because of machine saturation, even at low current-density, that offsets all the benefits. This paper proposes an approach to maximize the torque density by finding appropriate electrical excitations on the two stator windings for a given machine dimension while remaining within flux- and current-density limits. A single-objective optimization problem is formulated. The obtained results prove that while designs with equal electrical loadings on both stators, and an initial current phase offset of π/2 between the two stators, may seem a good design approach, they are far from being optimal. Our optimized solution establishes that the phase offset of 2π/3 provides maximum torque capability for an identical dimension. This procedure is validated using FEA simulations. Operating with this design also leads to higher machine efficiency and better power factor on the secondary stator, thus reducing the converter rating.

Original languageEnglish (US)
Title of host publication2019 IEEE Energy Conversion Congress and Exposition, ECCE 2019
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages298-305
Number of pages8
ISBN (Electronic)9781728103952
DOIs
StatePublished - Sep 2019
Event11th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2019 - Baltimore, United States
Duration: Sep 29 2019Oct 3 2019

Publication series

Name2019 IEEE Energy Conversion Congress and Exposition, ECCE 2019

Conference

Conference11th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2019
CountryUnited States
CityBaltimore
Period9/29/1910/3/19

Keywords

  • Air-gap flux density
  • Brushless
  • Current rating
  • Doubly-fed
  • Optimization
  • Rotor modulation

ASJC Scopus subject areas

  • Mechanical Engineering
  • Control and Optimization
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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  • Cite this

    Agrawal, S., Province, A., & Banerjee, A. (2019). An Approach to Maximize Torque Density in a Brushless Doubly-fed Reluctance Machine. In 2019 IEEE Energy Conversion Congress and Exposition, ECCE 2019 (pp. 298-305). [8912700] (2019 IEEE Energy Conversion Congress and Exposition, ECCE 2019). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/ECCE.2019.8912700