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Attraction of the cylindrical magnets

QuickField simulation example

Two coaxial cylindrical permanent magnets are pulled to each other.

Problem Type
Axisymmetric problem of DC magnetics

Geometry
Attraction of the cylindrical magnets Two coaxial cylindrical permanent magnets are pulled to each other Permanent magnet δ l D

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, Hc = 954930 A/m, Br = 1.26 T;

Task
Calculate the pulling 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
Two coaxial cylindrical permanent magnets attraction simulation

Pull force
QuickField 164 N
Reference* 153 N (33.77 lb, 1 lb = 4.54 N)

* Reference: www.kjmagnetics.com.