Model Order Reduction of Bearingless Reluctance Motor Including Eccentricity

Mehrnaz Farzam Far, Victor Mukherjee, Floran Martin, Paavo Rasilo, Anouar Belahcen

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

1 Citation (Scopus)


Eccentricity in a bearingless motor may occur during different operating states of the machine. This rises challenges in designing robust control for the machine with a lumped parameter model, due to the cross coupling of the windings with respect to the eccentric position of the rotor, the saturation of the ferromagnetic material, and spatial complexity. The non-linearity of the ferromagnetic material and the spatial harmonics can be considered in a finite element model of the machine, although applying it in a real time system is unreasonable. We propose a novel method based on orthogonal interpolation to reduce the order of the 2D finite element model of a bearingless synchronous reluctance motor, suitable for implementation in a real-time system. The winding currents and the eccentricity are given as inputs to the reduced model and the nodal values of the magnetic vector potential is obtained as the output, wherefrom the flux linkages, torque, and forces can be computed easily.

Original languageEnglish
Title of host publicationProceedings of the 2018 23rd International Conference on Electrical Machines, ICEM 2018
Number of pages7
ISBN (Electronic)9781538624777
Publication statusPublished - 24 Oct 2018
MoE publication typeA4 Article in a conference publication
EventInternational Conference on Electrical Machines - Ramada Plaza Thraki, Alexandroupoli, Greece
Duration: 3 Sep 20186 Sep 2018
Conference number: 23


ConferenceInternational Conference on Electrical Machines
Abbreviated titleICEM
Internet address


  • Bearingless synchronous reluctance motor
  • Eccentricity
  • Finite element analysis
  • Model order reduction
  • Orthogonal interpolation method


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