I'm modeling two NdFeB magnets placed very close to each other in a repulsive manner. I need to compute the repelling force between them.
There are two options for the constitutive relation. One is
B = mu0*(H+M)
where I specify the magnetization M vector based on the demagnetization curve of the magnet.
The other is
B = mu0*mur*H+Br
where Br is the remanent flux density of the magnet and mur can be calculated from the demagnetization curve.
The problem is that two methods seem to give different force results, with that of the first one bigger than the second. Which constitutive relation is closer to reality?
There are two options for the constitutive relation. One is
B = mu0*(H+M)
where I specify the magnetization M vector based on the demagnetization curve of the magnet.
The other is
B = mu0*mur*H+Br
where Br is the remanent flux density of the magnet and mur can be calculated from the demagnetization curve.
The problem is that two methods seem to give different force results, with that of the first one bigger than the second. Which constitutive relation is closer to reality?