Magnetic Bearings for Non-static Flywheel Energy Storage Systems (FESS)

Nikolaj Dagnæs-Hansen, Ilmar F. Santos

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


Proper dimensioning of magnetic bearings for non-static gimballed FESS is currently hindered by the lack of models that can predict the maximum forces in the bearings. If FESS is to compete with conventional electro-chemical batteries in terms of energy density, the magnetic bearings must be dimensioned optimally for weight and size. Magnetically suspended FESS has been experimentally investigated; however, the methods for theoretically predicting magnetic bearing loads are still limited. This paper presents how to determine such magnetic bearing loads in a gimballed FESS subject to a moving foundation. The predicted forces are compared with measurements from an experimental test bench with good agreement. Furthermore, the maximum forces in a gimballed FESS are compared with maximum forces in a non-gimballed FESS. It was found that the gyroscopic forces in the non-gimballed case quickly become critical making the gimbal mount essential for reducing magnetic bearing loads.
Original languageEnglish
Title of host publicationProceedings of the 10th International Conference on Rotor Dynamics (IFToMM 2018)
EditorsKatia Lucchesi Cavalca, Hans Ingo Weber
Publication date2018
ISBN (Print)978-3-319-99261-7
ISBN (Electronic)978-3-319-99262-4
Publication statusPublished - 2018
Event10th International Conference on Rotor Dynamics - Rio de Janeiro, Brazil
Duration: 23 Sep 201827 Sep 2018
Conference number: 10


Conference10th International Conference on Rotor Dynamics
CityRio de Janeiro
SeriesMechanisms and Machine Science


  • Active magnetic bearings
  • Permanent magnet bearings
  • Flywheel energy storage system

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