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Repelling of the cylindrical magnets

Two coaxial cylindrical permanent magnets repel one another.

Problem type:
Axisymmetric problem of magnetostatics


Two coaxial cylindrical permanent magnets model

D = 2" (50.8 mm) - magnet diameter;
l = 0.65" (16.51 mm) - magnet thickness;
δ=0.5" (12.7 mm) - gap between the magnets;

magnet grade N35, Hc = 954930 A/m, Br = 1.26 T;

Calculate the repelling force between two coaxial cylindrical magnets.

To calculate the correct result an integration contour is drawn in the air around one of the magnets.


Two coaxial cylindrical permanent magnets repulsion simulation

Repelling force


160 N


153 N (33.77 lb, 1 lb = 4.54 N)

* Reference: www.kjmagnetics.com.

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You can view field maps, make plots, calculate integrals and print pictures in the same way that the Professional Edition users do.