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.
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