How to calculate maximum magnetic flux density of magnet?
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Use this Formula
Formula for block magnet flux density
Formula for the B field on the symmetry axis of an axially magnetised block magnet (block or cube):
\begin{aligned}B &= \frac{B_r}{\pi}\left[arctan\bigg(\frac{LW}{2z\sqrt{4z^2+L^2+W^2}}\bigg)- arctan\bigg(\frac{LW}{2(D+z)\sqrt{4(D+z)^2+L^2+W^2}}\bigg)\right]\end{aligned}B=πBr[arctan(2z4z2+L2+W2LW)−arctan(2(D+z)4(D+z)2+L2+W2LW)]

Br: Remanence field, independent of the magnet's geometry
z: Distance from a pole face on the symmetry axis
L: Length of the block
W: Width of the block
D: Thickness (or height) of the block
The unit of length can be selected arbitrarily, as long as it is the same for all lengths.
Formula for block magnet flux density
Formula for the B field on the symmetry axis of an axially magnetised block magnet (block or cube):
\begin{aligned}B &= \frac{B_r}{\pi}\left[arctan\bigg(\frac{LW}{2z\sqrt{4z^2+L^2+W^2}}\bigg)- arctan\bigg(\frac{LW}{2(D+z)\sqrt{4(D+z)^2+L^2+W^2}}\bigg)\right]\end{aligned}B=πBr[arctan(2z4z2+L2+W2LW)−arctan(2(D+z)4(D+z)2+L2+W2LW)]

Br: Remanence field, independent of the magnet's geometry
z: Distance from a pole face on the symmetry axis
L: Length of the block
W: Width of the block
D: Thickness (or height) of the block
The unit of length can be selected arbitrarily, as long as it is the same for all lengths.
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