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Calculate flux density on the centerline of a magnet (or magnet system) at a distance x, given the residual induction, Br, of the magnet.
Rectangular Magnets
Disc Magnets
Ring Magnets
Alnico Magnets
See the guide below for flux density for various Alnico magnets. (You cannot use the equations above to calculate flux density of Alnico magnets.)
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Flux Density table for Sintered Alnico Magnets
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Material
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Shape
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Dimensions (Dia. x Length)
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Distance (in.) from surface resulting in flux density of:
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100 Gauss
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150 Gauss
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200 Gauss
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250 Gauss
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Alnico 8H
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Cylinder
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.125" X .125"
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0.124
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0.101
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0.084
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0.074
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Alnico 8H
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Cylinder
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.125" X .250"
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0.172
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0.136
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0.110
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0.093
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Alnico 8H
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Cylinder
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.250" X .0625"
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0.144
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0.116
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0.090
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0.068
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Alnico 8H
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Cylinder
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.250" X .125"
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0.225
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0.180
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0.146
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0.120
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Alnico 8H
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Cylinder
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.250" X .250"
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0.293
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0.236
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0.195
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0.166
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Alnico 8H
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Cylinder
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.375" X .125"
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0.283
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0.230
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0.186
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0.153
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Alnico 8H
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Cylinder
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.375" X .250"
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0.387
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0.318
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0.264
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0.218
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Alnico 8H
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Cylinder
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.500" X .125"
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0.315
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0.243
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0.188
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0.148
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Alnico 8H
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Cylinder
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.500" X .250"
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>0.4
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0.378
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0.306
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0.268
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Alnico 8H
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Cylinder
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.500" X .500"
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>0.4
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>0.4
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>0.4
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0.390
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Alnico 5
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Rectangle
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.125"sq. X .750"
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0.257
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0.195
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0.159
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0.136
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Alnico 5
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Cylinder
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.250" X 1.00"
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0.480
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0.375
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0.324
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0.279
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