A Flux-Focusing Cycloidal Magnetic Gearbox

Kang Li, Oregon Graduate Institute of Science & Technology
Jonathan Bird, Portland State University
Joshua Kadel, University of North Carolina at Charlotte
Wesley Williams, University of North Carolina at Charlotte

Appeared in IEEE Transactions on Magnetics, vol. 51, no. 11, Nov. 2015.

©Copyright 2016 IEEE - All rights reserved. DOI: 10.1109/TMAG.2015.2440218


This paper investigates the performance of a -25:1 gear ratio cycloidal magnetic gearbox (CMG) with a flux-focusing rotor topology. The performance of the CMG is investigated by conducting an iterative parameter sweep analysis. An active region torque density of 291 Nm/L is calculated to be achievable with a 0.46% torque ripple. The cycloidal gearbox operates utilizing a nonuniform rotor air gap and this has the adverse effect of creating large nonsymmetric radial forces.