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Home > Issues > SearchA Fine Modified Calculation Model with Experimental Verification for the Holding Force of the Permanent Magnet
Journal of Magnetics, Volume 27, Number 3, 30 Sep 2022, Pages 256-262
Peiliang Liu (R & D Department, ChenYang Technologies GmbH & Co.), Jigou Liu * 
(R & D Department, ChenYang Technologies GmbH & Co.), Ulrich Westenthanner (Mechanical, Automotive, Aeronautical Engineering, Munich University of Applied Sciences)
(R & D Department, ChenYang Technologies GmbH & Co.), Ulrich Westenthanner (Mechanical, Automotive, Aeronautical Engineering, Munich University of Applied Sciences)
Abstract
For the common technical applications of permanent magnets such as cylindrical and rectangular permanent
magnets, the formula of the holding force, which is based on the idea of equivalent current source and associated
with Lorentz force, is fine modified with introducing two parameters, the chamfer size of the magnet and
the thickness of the outer protective film. Furthermore, the model is verified by external experimental data.
The accuracy of our proposed model has been significantly improved compared to the base model, with an
average improvement of 6.3 %. With external data, the average error of the refined model is within 6 %. Compared
to other currently available online calculators, our calculation model offers superior calculation accuracy.
magnets, the formula of the holding force, which is based on the idea of equivalent current source and associated
with Lorentz force, is fine modified with introducing two parameters, the chamfer size of the magnet and
the thickness of the outer protective film. Furthermore, the model is verified by external experimental data.
The accuracy of our proposed model has been significantly improved compared to the base model, with an
average improvement of 6.3 %. With external data, the average error of the refined model is within 6 %. Compared
to other currently available online calculators, our calculation model offers superior calculation accuracy.
Keywords: cylindrical permanent magnet; rectangular permanent magnet; analytical calculation; holding force; chamfer size; experimental verification
DOI: https://doi.org/10.4283/JMAG.2022.27.3.256
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