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Magn1: Nonlinear permanent magnet

A simulation of permanent magnet and a steel keeper in the air, performed with QuickField software.

Problem Type:

Plane problem of DC magnetics.

Geometry:

Nonlinear permanent magnet

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

-14728

-119400

-99470

-79580

-53710

-19890

0

B, T

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

Problem:

Find maximum flux density in Y-direction

Solution:

To avoid the influence of the boundaries while modelling the unbounded problem, we'll enclose the magnet in a rectangular region of air and specify zero Dirichlet boundary condition on its sides.

Comparison of results

Flux density in nonlinear permanent magnet:

Maximum flux density in Y-direction:
 

By, T

ANSYS

0.42

COSMOS/M

0.404

QuickField

0.417

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