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Two simple modifications to improve the magnetic field profile in radial magnetic systems

Published

Author(s)

Stephan Schlamminger, Shisong Li

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

Keywords

magnet system, watt balance

Citation

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 April 16, 2024)
Created September 12, 2017, Updated November 29, 2019