Home / Examples / Magnetic Analysis (Gauss, Static Analysis/Harmonic analysis) / Example 14: Analysis of a Transformer

Example 14: Analysis of a Transformer

General

• Two coils coupled with a loop magnetic core are solved.
   

• The coupling coefficient, 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.

 

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

Model

Bodies of two loop coils (Coil1, Coil2) and magnetic core are defined.

The body attributes are set so that the currents of two loop coils flow in the opposite direction each other.

 

Body Attributes and Materials

Body Number/Type	Body Attribute Name	Material Name
1/Solid	Coil2	008_Cu *
3/Solid	Coil1	008_Cu *
4/Solid	Core	Core

* Available from the material DB

 

The material properties are set up as follows:

Material Name	Tab	Properties
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
Coil1	Current	Waveform: Constant Current: 1 [A] Turns: 100 [Turns] Direction: Loop Coil/Magnetic Field Direction Magnetic Field Vector: X=0, Y=0, Z=1
Coil2	Current	Waveform: Constant Current: 1 [A] Turns: 100 [Turns] Direction: Loop Coil/Magnetic Field Direction Magnetic Field Vector: X=0, Y=0, Z=-1

Boundary Conditions

No setting.

Results

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

 

 

 and click [Show Numerical Summary Table] .

 

The inductances of the loop coils are output as follows.

 

 

The coupling coefficient is output as follows.

 

 

The vectors of the magnetic field are shown below.

 

The vectors of the magnetic flux density are shown below.

The flux density is looping through the iron core.

 

The vectors of the current density are shown below.