若为线形材料，直接指定磁导率，若为非线形材料，则指定B-H曲线

来自HELP

For linear magnetic material, you can specify relative permeability values MURX, MURY, and MURZ using the MP command.

For nonlinear soft magnetic material, specify the B-H curve by reading from a material library or by creating your own B-H curve

To invoke the usage of a B-H curve along one of the axes, set the relative permeability for that axis explicitly to zero. For example, assume a B-H curve is defined for material number 2. You want to have the curve active along the Y-axis, while assigning the X and Z axes a relative permeability of 1000. Your input would be:

mp,murx,2,1000 mp,mury,2,0! read B-H curve for material 2 mp,murz,2,1000

If a B-H curve is specified along with zero permeability in two directions and a non-zero permeability 
in one direction, the B-H curve will be applied to the two axes with zero permeability.
 For example, if MURX and MURY are zero and MURZ is non-zero, the B-H equations are: 
where: