A permanent magnet and a steel keeper in the air.
Problem Type:
A nonlinear plane-parallel problem of magnetostatics.
Geometry:
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.