Articlegreen2016

Designing Model and Optimization of the Permanent Magnet for Joule Balance NIM-2

Qiang You · Jinxin Xu · Zhengkun Li · Shisong Li

22 citations0/0 files storedIEEE Transactions on Instrumentation and Measurement

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Scientific Measurement and Uncertainty Evaluation Advanced Measurement and Metrology Techniques Advanced Electrical Measurement Techniques

Abstract

The permanent magnet with yokes is widely used in watt and joule balances to measure the Planck constant for the forthcoming redefinition of the unit of mass, the kilogram. Recently, the permanent magnet has been in consideration for a further practice of National Institute of Metrology (NIM)-2, the generalized joule balance. In this paper, an analytical model to design the permanent magnet system is proposed. This model can be solved to obtain the preliminary parameters and then used as guidance for the finite element analysis software to optimize the parameters of such a magnet system. As an instance of the application of this designing model, the permanent magnet system for NIM-2 is described. The special shape of the contact areas minimizes the effect of misalignment of the top and middle yokes on the vertical component of the magnetic field.

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References

2006Redefinition of the kilogram, ampere, kelvin and mole: a proposed approach to implementing CIPM recommendation 1 (CI-2005)1976A Measurement of the Gyromagnetic Ratio of the Proton by the Strong Field Method 2012Watt balance experiments for the determination of the Planck constant and the redefinition of the kilogram 2013Design of the new METAS watt balance experiment Mark II 2005Magnetic Circuit Design for the BNM Watt Balance Experiment 2012Design of the Permanent-Magnet System for NIST-4 2016A determination of the Planck constant by the generalized joule balance method with a permanent-magnet system at NIM 2011Precisely measuring the Planck constant by electromechanical balances

Cited by

2020A Simple Improvement for Permanent Magnet Systems for Kibble Balances: More Flat Field at Almost No Cost 2021The irony of the magnet system for Kibble balances—a review 2020The upgrade of NIM-2 joule balance since 2017 2019Magnet System for the Quantum Electromechanical Metrology Suite 2018A new magnet design for future Kibble balances

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