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Magn1: Nonlinear permanent magnet

A permanent magnet and a steel keeper in the air.

Problem Type:
A nonlinear plane-parallel problem of magnetostatics.

Geometry:

All dimensions are in centimeters.

Given:
The permanent magnets are made of ALNICO, coercive force is 147218 A/m. The polarizations of the magnets are along vertical axis opposite to each other. The demagnetization curve for ALNICO:

H (A/m)

147218

119400

99470

79580

53710

19890

0.0

B (T)

0.0

0.24

0.4

0.5

0.6

0.71

0.77


The B-H curve for the steel:

H (A/m)

400

600

800

1000

1400

2000

3000

4000

6000

B (T)

0.73

0.92

1.05

1.15

1.28

1.42

1.52

1.58

1.60


Comparison of Results:
Maximum flux density in y-direction:

ANSYS

0.42

COSMOS/M

0.404

QuickField

0.417


See the Magn1.pbm problem in the Examples folder.