Main >>Applications >> Sample problems >> Attraction of the ring-shaped magnets
Two coaxial permanent ring-shaped magnets are pulled to each other.
Axisymmetric problem of magnetostatics
D1 = 2" (50.8 mm) inner diameter of the ring magnet;
D2 = 0.5" (12.7 mm) outer diameter of the ring magnet;
l = 0.75" (19.05 mm) - thickness of the magnet;
δ=0.5" (12.7 mm) - gap between the magnets.
magnet grade N35, Hc = 954930 A/m, Br = 1.26 T;
Calculate the pulling force between two coaxial ring-shaped permanent magnets.
For accurate calculation, the integration contour is drawn in the air around one of the magnet.
Magnetic field lines and mechanical force calculation
175 N (38.51 lb, 1 lb = 4.54 N)
* Reference: www.kjmagnetics.com.