General
Home / Examples / Magnetic Analysis (Gauss, Static Analysis/Harmonic analysis) / Example 7: Force between Magnet and Electromagnet
In this example, a magnet is placed near the electromagnet used in the example 6.
The electromagnetic force, the current density, and the vectors of magnetic field and the magnetic flux density are solved.
This example can be solved by axisymmetric analysis as well. See Example 25.
The number of meshes is much less with axisymmetric models, so the simulation time is shorter.
Unless specified in the list below, the default conditions will be applied.
Results will vary depending on Femtet version and the PC environment.
Item |
Settings |
Analysis Space |
3D |
Model Unit |
mm |
Item |
Settings |
Solver |
Magnetic Analysis [Gauss] |
Analysis Type |
Static Analysis |
Options |
N/A |
A cylindrical magnet is placed on top of the magnetic core of the electromagnet used in the example 6.
Mesh size is set at 1[mm] as the magnetic field changes drastically between the magnets.
Set the gap between the bodies and mesh size properly to obtain valid calculation results.
See [Calculation of the Electromagnetic Force] for more details.
Body Number/Type |
Body Attribute Name |
Material Name |
0/Solid |
Core |
Core |
4/Solid |
Coil |
008_Cu * |
3/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: 0.5 |
|
Core |
Permeability |
Relative Permeability 5×103 |
Body attribute is set up as follows to apply current to the loop coil.
Body Attribute Name |
Tab |
Settings |
Coil |
Current |
Waveform: Constant Current: 1 [A] Turns: 100 [Turns] Direction: Loop Coil/Magnetic Field Direction Specified Magnetic Field Vector: X=0, Y=0, Z=1 |
No setting.
To see the electromagnetic force, go to the [Results] tab
and click [Table] 
.
Two magnets are pulling each other with the approximate force of 1.2 [N] in the Z direction.
Shown below are the vectors of the current density flowing through the loop coil.
The vectors of the magnetic field are shown below.
The vectors of the magnetic flux density are shown below.
