## Title data

Hartung, Stefan ; Rehberg, Ingo:

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

*In:* Archive of Applied Mechanics.
Vol. 91
(2021)
Issue 4
.
- pp. 1423-1435.

ISSN 0939-1533

DOI: https://doi.org/10.1007/s00419-020-01830-z

## Abstract in another language

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.