Attraction of the block magnets

QuickField simulation example

Two rectangular prism shaped permanent magnets are pulled to each other.

Problem Type
Plane-parallel problem of DC magnetics

Geometry

Given
w=1.5" (38.1 mm) - magnet width;
t=0.25" (6.35 mm) - magnet thickness;
L=0.25" (6.35 mm) - magnet length;
δ=0.5" (12.7 mm) - gap between the magnets.

Task
Calculate the pulling force between two magnets.

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

Result

* Reference: www.kjmagnetics.com.

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