Analysis of Electromagnetic Force Ripple in a Bearingless Synchronous Reluctance Motor

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Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2021-02
Department
Department of Electrical Engineering and Automation
Major/Subject
Mcode
Degree programme
Language
en
Pages
8
Series
IEEE Transactions on Magnetics
Abstract
A bearingless machine should be designed to maximize the average and to minimize the ripple in the electromagnetic torque and levitating force. In a bearingless synchronous reluctance machine (BSynRM), the complex rotor design and the levitation winding create a rich spatial and temporal spectrum of the magnetic flux density in the airgap, which affects both the torque and force ripple. In this article, a novel method is introduced to compute the electromagnetic forces from the spatial harmonics of the airgap flux density. A new indexing method is introduced to classify the spatial harmonic wavenumbers and temporal harmonic frequencies of the flux density in the electromagnetic force. The proposed model enables the understanding of the spatial harmonic footprint on the temporal frequencies of the electromagnetic force ripple. The study is carried out through finite element simulations, which are verified by prototype measurements.
Description
Keywords
Bearingless Machine, Electromagnetic Forces, Electromagnetic forces, Flux Barriers, Force, Harmonic analysis, Harmonics, Levitation, Magnetic levitation, Reluctance motors, Rotors, Windings
Other note
Citation
Mukherjee, V, Rasilo, P, Martin, F & Belahcen, A 2021, ' Analysis of Electromagnetic Force Ripple in a Bearingless Synchronous Reluctance Motor ', IEEE Transactions on Magnetics, vol. 57, no. 2, 8103908 . https://doi.org/10.1109/TMAG.2020.3041703