Schlamminger, S.
and Li, S.
(2017),
Two simple modifications to improve the magnetic field profile in radial magnetic systems, Measurement Science & Technology, [online], https://doi.org/10.1088/1361-6501/aa5f9c
(Accessed October 18, 2025)
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Two simple modifications to improve the magnetic field profile in radial magnetic systems
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Abstract
All current watt balances employ permanent magnet systems using a yoke with high permeability as flux return. Very often these systems are built with vertical and azimuthal symmetries. In its simplest form, the air gap is defined by an inner and outer yoke with the same height. This design leads to sloped field lines away from the plane of vertical symmetry. In order to suppress this vertical magnetic field, we propose two modified magnet constructions: (1) Adding a permanent magnet in the outer yoke and (2) decreasing the height of the outer yoke. Finite element method (FEM) simulations show that, with reasonable optimization, either proposals can lower the vertical magnetic field by about one magnitude.Citation
Measurement Science & Technology
Volume
28
Pub Type
Journals
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Keywords
magnet system, watt balance
Citation
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Created September 12, 2017, Updated November 29, 2019