Forces in Axial Flux Magnetic Gears with Integer and Fractional Gear Ratios

Janusz Kołodziej,Marcin Kowol,Marian Łukaniszyn,Rafał Gabor,Piotr Mynarek

doi:10.3390/en14040855

Abstract

This paper presents a comparison of two variants of an axial flux magnetic gear (AFMG), namely, with integer and fractional gear ratios. Based on calculations derived with the use of three-dimensional numerical models, the torque characteristics of the analyzed AFMGs are computed and verified on a physical model. The greatest emphasis is put on the detailed decomposition and analysis of local forces in modulator pole pieces (also used in the structural analysis) within the no-load and maximal load conditions. The authors also describe the unbalanced magnetic forces (UMF) in the axial and radial directions resulting from the construction of the considered AFMGs variants, and their possible effects in the context of the use of additive manufacturing (AM) in prototypes. The paper also proposes an effective method for limiting the axial strain by using the asymmetry of the air gaps, which slightly reduces the torque transmitted by AFMGs. Finally, a static strength analysis was presented that allows us to assess the effects of local forces in the form of modulator disc deformation for selected cases of air gap asymmetry.

Highlights

This paper presents a comparison of two variants of an axial flux magnetic gear (AFMG), namely, with integer and fractional gear ratios
We focus on a detailed decomposition of local forces and the analysis of their components in terms of magnetic pull reduction, pulsation reduction and modulator rigidity, keeping the total air gaps’ thickness constant; these being challenging issues not yet deeply considered
Synthesis of local effects is useful an the analysis presented in this paper provides somethe relevant information that is interesting issue, as it allows the properties of the MGespecially variants under consideration to be for possible vibroacoustic, strength and ageing tests, in terms of prototyping assessed as a whole

Summary

Introduction

This paper presents a comparison of two variants of an axial flux magnetic gear (AFMG), namely, with integer and fractional gear ratios. The authors describe the unbalanced magnetic forces (UMF) in the axial and radial directions resulting from the construction of the considered AFMGs variants, and their possible effects in the context of the use of additive manufacturing (AM) in prototypes. Current constructions of electromechanical transducers are mainly high-performance, rotating, energy conversion systems In this respect, radial flux machines play a dominant role. The appearance of a study [3] on a group of AFMGs was only a matter of time This subject has been continued in papers [4,5,6,7,8,9,10,11], wherein a number of analyses concerning the principles of operation and the design aspects of these gears, largely supported by measurements, were presented. Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations

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