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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 A simulation of permanent magnet and a steel keeper in the air, performed with QuickField software. Steel Steel ALNICO A B C D E F G H I J K L M N 10 cm 20 cm 40 cm 10 cm 20 cm 10 cm 10 cm

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:

The B-H curve for the steel:

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.

Results:
Flux density in nonlinear permanent magnet:

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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