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Flux Density Calculations

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.)

Flux Density table for Sintered Alnico Magnets
Material
Shape
Dimensions (Dia. x Length)
Distance (in.) from surface resulting in flux density of:
100 Gauss
150 Gauss
200 Gauss
250 Gauss
Alnico 8H
Cylinder
.125" X .125"
0.124
0.101
0.084
0.074
Alnico 8H
Cylinder
.125" X .250"
0.172
0.136
0.110
0.093
Alnico 8H
Cylinder
.250" X .0625"
0.144
0.116
0.090
0.068
Alnico 8H
Cylinder
.250" X .125"
0.225
0.180
0.146
0.120
Alnico 8H
Cylinder
.250" X .250"
0.293
0.236
0.195
0.166
Alnico 8H
Cylinder
.375" X .125"
0.283
0.230
0.186
0.153
Alnico 8H
Cylinder
.375" X .250"
0.387
0.318
0.264
0.218
Alnico 8H
Cylinder
.500" X .125"
0.315
0.243
0.188
0.148
Alnico 8H
Cylinder
.500" X .250"
>0.4
0.378
0.306
0.268
Alnico 8H
Cylinder
.500" X .500"
>0.4
>0.4
>0.4
0.390
Alnico 5
Rectangle
.125"sq. X .750"
0.257
0.195
0.159
0.136
Alnico 5
Cylinder
.250" X 1.00"
0.480
0.375
0.324
0.279

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