CAE Software【Femtet】Murata Software Co., Ltd.
General
The permeance of a magnet is calculated.
Unless specified in the list below, the default conditions will be applied.
Item |
Settings |
Solvers |
Magnetic Field Analysis [Gauss] |
Analysis Space |
3D |
Analysis Type |
Static analysis |
Model unit |
mm |
Options |
N/A |
The permeance of a spherical magnet is calculated.
The magnetizing direction of the magnets is +Z by default.
Body Number/Type |
Body Attribute Name |
Material Name |
1/Solid |
mag |
mag |
* Available from the Material DB
The material properties are set up as follows:
Material Name |
Tab |
Properties |
mag |
Permeability |
Material Type: Permanent Magnet |
Magnet |
Magnetization Strength: 1.0 |
Open boundary is set for the outer boundary condition.
Boundary Condition Name/Topology |
Tab |
Boundary Condition Type |
Settings |
Outer Boundary Condition |
Electric |
Open boundary |
|
Permeance coefficient is given by
Pc = B/u0H
where B is the magnetic flux density [T], H is the magnetic field [A/m] and u0 is the permeability of vacuum, 4πx10-7.
Pc of a particular point in magnet can be calculated from B and H at that point..
The distribution of permeance can be viewed with contour diagram.
See [User-Defined Field] for the detail.
It is constant in case of spheroids.
B and H at a particular point can be obtained as follows.
Select [Magnetic flux density] at Field in the Display group on the [Results] tab.
Click [Results at Specified Coordinates] .
Enter the coordinates of the point. For example, enter (0, 0, 0).
Click the Calculate button. [Magnetic flux density] will be calculated and displayed on the screen.
Then, change the Field from [Magnetic flux density] to [Magnetic field].
Calculate [Magnetic field] in the same manner.
The permeance coefficient can be calculated from their z components.
Pc = 6.666876e-001 / 2.652416e+005 / u0 = 2.000188
It is very close to the theoretical value of 2.