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Modeling of magnetic field perturbations on the balance-spring of a mechanical watch

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Abstract

A magnetic field is a major enemy of a mechanical watch. This field may modify the structure of the balance-spring and change its resonance frequency. As a consequence, the watch loses its accuracy. The aim of this work is to quantify the impact of the magnetic field to the balance-spring resonance using a finite element approach. This coupled magneto-mechanical problem implies magnetic forces computation while accounting for a large rotation of the spring. An original algorithm including a dynamic mechanical time-stepping scheme is proposed to quantify the change of the resonance frequency. Index Terms-Mechanical watch, resonance frequency, coupled magneto-mechanic problem.
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Dates and versions

hal-01235591 , version 1 (17-03-2020)

Identifiers

  • HAL Id : hal-01235591 , version 1

Cite

Refzul Khairi, Xavier Mininger, Romain Corcolle, Lionel Pichon, Laurent Bernard. Modeling of magnetic field perturbations on the balance-spring of a mechanical watch. 20th International Conference on Computation of Electromagnetic Fields (Compumag 2015), Jun 2015, Montréal, Canada. ⟨hal-01235591⟩
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