Dynamics of a magnetic gear with two cogging-free operation modes

Titelangaben

Hartung, Stefan ; Rehberg, Ingo:
Dynamics of a magnetic gear with two cogging-free operation modes.
In: Archive of Applied Mechanics. Bd. 91 (2021) Heft 4 . - S. 1423-1435.
ISSN 0939-1533
DOI: https://doi.org/10.1007/s00419-020-01830-z

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Abstract

The coupling of two rotating spherical magnets is investigated experimentally. For two specific angles between the input and output rotation axes, a cogging-free coupling is observed, where the driven magnet is phase-locked to the driving one. The striking difference between these two modes of operation is the reversed sense of rotation of the driven magnet. For other angles, the experiments reveal a more complex dynamical behavior, which is divided in three different classes. This is done by analyzing the deviation from a periodic motion of the driven magnet, and by measuring the total harmonic distortion of this rotation. The experimental results can be understood by a mathematical model based on pure dipole–dipole interaction, with the addition of adequate friction terms.