Home / Examples / Magnetic Analysis (Gauss, Static Analysis/Harmonic analysis) / Example 23: Toroidal Coil

Example 23: Toroidal Coil

General

• The magnetic field generated by a toroidal coil is analyzed.
   

• The vectors of the magnetic field and the magnetic flux density are solved.
   

• Unless specified in the list below, the default conditions will be applied.
   

• Obtain this session's project file. (Right-click and choose 'Save link as')
  
  

• Results will vary depending on Femtet version and the PC environment.

 

• The coil is created from [Macro Sample] #3 that is on Murata Software’s website.

 

Analysis Space

Item	Settings
Analysis Space	3D
Model Unit	mm

 

Analysis Conditions

Item	Settings
Solver	Magnetic Analysis [Gauss]
Analysis Type	Static Analysis
Options	N/A

 

Set the Mesh Tab as follows.

Tab	Setting Item	Settings
Mesh	Meshing Setup	Automatically set the general mesh size: Deselect General Mesh Size: 1 [mm]

Model

Coil (Cur) is wound on the ferrite core (Ferrite).

 

The coil's form is given by the following equations.

 

x = ( A*sin(t*N) + B ) * cos(t)
y = ( A*sin(t*N) + B ) * sin(t)
z = A*cos(t*N)
A: Radius of the coil
B: Radius of the torus (Intermediate value between the outer and inner radiuses)
N: Number of turns of coil
t: Angle
 

Body Attributes and Materials

Body Number/Type	Body Attribute Name	Material Name
0/Solid	Ferrite	Ferrite
5/Solid	Cur	008_Cu

* Available from the material DB

 

Material Name	Tab	Settings
Ferrite	Permeability	Relative Permeability: 1x103

Boundary Conditions

No setting.

Results

To see the calculation results of electromagnetic force and inductance, go to the [Results] tab

 

 

 and click [Show Numerical Summary Table] .

 

 

The vectors of the magnetic flux density are shown below.

 

The vectors of the magnetic field are shown below.