Influence of Airgap Length on Performance of High Power PM-Assisted Syn-Rel Machines

Tianjie Zou, David Gerada, Adam Walker, Gaurang Vakil, Salvatore La Rocca, Antonino La Rocca, Krzysztof Paciura, Richard Barden, Emil Ernest, Shaohong Zhu, Naila Qayyum, Alastair McQueen, Anuvav Bardalai, R. M. Ram Kumar, Alessandro Marfoli, Chris Gerada

Research output: Chapter in Book/Conference proceedingConference contributionpeer-review

Abstract

In recent years, synchronous reluctance (Syn-Rel) machines are research hotspots in variable speed motor drives due to their robust rotor structure and wide constant power speed range (CPSR). More practically, when kVA limitation is considered, embedded permanent magnets (PMs) have been widely adopted in Syn-Rel rotors to further increase power density as well as power factor. In this paper, the authors have investigated the potential of PM-assisted Syn-Rel machine to be the next generation electrical propulsion motor topology for automotive application, with special attention put on a key geometric parameter, i.e., airgap length. In MTPA region, the influence of airgap length on different torque components has been analyzed in detail based on the frozen permeability method. In field weakening region, the variation trend of several key performance such as peak power, iron loss and torque ripple have been investigated along with airgap length. It is found that with specifically high level of electric and magnetic loading, there exists optimal value of airgap length to achieve high power density based on specific cooling and kVA limitation. Numerical FEA and experimental tests are associated to validate the conclusions.

Original languageEnglish
Title of host publicationECCE 2020 - IEEE Energy Conversion Congress and Exposition
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages1357-1363
Number of pages7
ISBN (Electronic)9781728158266
DOIs
Publication statusPublished - 11 Oct 2020
Externally publishedYes
Event12th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2020 - Virtual, Detroit, United States
Duration: 11 Oct 202015 Oct 2020

Publication series

NameECCE 2020 - IEEE Energy Conversion Congress and Exposition

Conference

Conference12th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2020
Country/TerritoryUnited States
CityVirtual, Detroit
Period11/10/2015/10/20

Keywords

  • NdFeB magnets
  • airgap length
  • high power density
  • high speed machine
  • synchronous reluctance machine

ASJC Scopus subject areas

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

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