Repelling of the cylindrical magnets

QuickField simulation example

Two coaxial cylindrical permanent magnets repel one another.

Problem Type
Axisymmetric problem of DC magnetics

Geometry

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;

Given
magnet grade N35, H_c = 909 kA/m, B_r = 1.21 T.

Task
Calculate the repelling force between two coaxial cylindrical magnets.

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

Result
Magnetic field lines and mechanical force calculation

* Reference: www.kjmagnetics.com.

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