Axial Force Negative Stiffness in Axial-Flux Electric Machines

Wen L. Soong, Emad Roshandel, Zhi Cao, Amin Mahmoudi, Solmaz Kahourzade

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

Abstract

This paper examines the axial force negative stiffness of induction and permanent magnet (PM) axial flux machines. First, simplified analytical models are used to identify the key normalised machine parameters which affect the variation of axial force with airgap length. For current-driven induction machines and PM machines, this is found to be the ratio of the effective magnetic length of the magnets and magnetic core divided by the nominal airgap. For voltage-driven (line-start) induction machines, it is the ratio of the stator leakage inductance to the nominal magnetising reactance. Next, the analytical results are validated against finite-element results and results from experimental axial force testing on induction and PM axial-flux machines.

Original languageEnglish
Title of host publication2023 IEEE International Magnetic Conference - Short Papers, INTERMAG Short Papers 2023 - Proceedings
PublisherInstitute of Electrical and Electronics Engineers
Number of pages2
ISBN (Electronic)9798350338362
DOIs
Publication statusPublished - 4 Sept 2023
Event2023 IEEE International Magnetic Conference - Short Papers, INTERMAG Short Papers 2023 - Sendai, Japan
Duration: 15 May 202319 May 2023

Publication series

Name2023 IEEE International Magnetic Conference - Short Papers, INTERMAG Short Papers 2023 - Proceedings

Conference

Conference2023 IEEE International Magnetic Conference - Short Papers, INTERMAG Short Papers 2023
Country/TerritoryJapan
CitySendai
Period15/05/2319/05/23

Bibliographical note

Publisher Copyright:
© 2023 IEEE.

Keywords

  • axial force
  • axial-flux machines
  • negative stiffness
  • unbalanced force

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