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Attraction of the block magnet to the steel plate
Rectangular prism shaped permanent magnet is pulled toward the ferromagnetic plate.
Problem type:
Plane-parallel problem of magnetostatics
Geometry:
w=1.5" (38.1 mm) - magnet width;
t=0.25" (6.35 mm) - magnet thickness;
l=0.25" (6.35 mm) - magnet length;
tpl=0.25" (6.35 mm) - plate thickness;
Given:
magnet grade N35, Hc = 954930 A/m, Br = 1.26 T;
relative magnetic permeability of the plate μsteel = 1000.
Task:
Calculate the pulling force of the magnet attraction to the steel plate.
Solution:
To calculate the pulling force accurately, and avoid integration along the edge dividing media with large difference in magnetic permeabilities, we place the magnet at a small distance δ = 0.005" (0.127 mm) from the steel plate. Integration contour is drawn in the air around the magnet.
Result:
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Pull force |
QuickField |
74 N |
Reference |
65 N (14.3 lb, 1 lb = 4.54 N) |
Reference: www.kjmagnetics.com.
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