Magn1: Nonlinear permanent magnet
A simulation of permanent magnet and a steel keeper in the air, performed with QuickField software.
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 |
-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
Maximum flux density in Y-direction:
| |
By, T |
ANSYS |
0.42 |
COSMOS/M |
0.404 |
QuickField |
0.417 |
|
