Influence of End-Effects on Static Torque Performance of Misaligned Cylindrical Permanent Magnet Couplings

Stig Högberg, Hilary Hansen, Bogi Bech Jensen, Flemming Buus Bendixen

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review


Permanent magnet couplings are widely used in applications requiring torque to be transmitted through an air- gap. The aim of this study is to observe and explain the effect of radial and axial misalignment in a 12-pole, cylindrical permanent magnet coupling. Pull-out torque was measured for two coupling pairs which showed an increase of 3.1% and 3.8%, respectively, at maximum radial misalignment. When modeled in finite element analysis software, the coupling produces 3.7% more static pull- out torque than the aligned case. For axial misalignment the pull-out torque at different misalignment distances was measured and simulated. An insignificant reduction in pull-out torque was observed for small misalignment, whereas it decreases linearly with misalignment distance when above 3–4 mm. These results show that radial and axial misalignment do not adversely affect static torque performance, though the affect on non-static performance is not considered and may be detrimental.
Original languageEnglish
Title of host publicationProceedings of ICEM 2014
Publication date2014
ISBN (Electronic)978-1-4799-4389-0
Publication statusPublished - 2014
EventXXIst International Conference on Electrical Machines - Berlin, Germany
Duration: 2 Sep 20145 Sep 2014
Conference number: 21


ConferenceXXIst International Conference on Electrical Machines


  • Couplings
  • Finite element analysis
  • Permanent magnets
  • Tolerance analysis
  • Torque measurement


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