Home / Examples / Magnetic Analysis (Gauss, Static Analysis/Harmonic analysis) / Example 32: Magnetic Field of Three-Phase AC

Example 32: Magnetic Field of 3-Phase AC

General

• Three-phase AC current flows in three conductors.
   

• The magnetic field vectors and the conductors' inductance and impedances 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	Harmonic Analysis
Options	N/A

 

The frequency of the current is set to 10 [kHz].

Tab	Setting Item	Settings
Mesh Tab	Frequency-Dependent Meshing	Reference Frequency: 10x103 [Hz]
Harmonic analysis	Sweep Type	Single Frequency
	Frequency	10×103 [Hz]

 

Set the Mesh Tab as follows.

Tab	Setting Item	Settings
Mesh Tab	Meshing Setup	Automatically set the general mesh size: Deselect General Mesh Size: 2 [mm]

Model

Conductors (Coil_u, Coil_v and Coil_w) are defined.

U, V, and W are phased at 0, -120, and +120 [deg] respectively.

Body Attributes and Materials

Body Number/Type	Body Attribute Name	Material Name
1/Solid	Coil_u	008_Cu *
2/Solid	Coil_v	008_Cu *
3/Solid	Coil_w	008_Cu *

* Available from the material DB

 

Body attribute is set up as follows to apply currents to each of the three coils.

U, V, and W are phased at 0, -120, and +120 [deg] respectively.

Body Attribute Name	Tab	Settings
Coil_u	Current	Waveform: AC Current: 1 [A] Phase: 0 [deg] Turns: 1 [Turns] Direction: Specify Inflow/Outflow faces Select Inflow face and Outflow face.
Coil_v	Current	Waveform: AC Current: 1 [A] Phase: -120 [deg] Turns: 1 [Turns] Direction: Specify Inflow/Outflow faces Select Inflow face and Outflow face.
Coil_w	Current	Waveform: AC Current: 1 [A] Phase: 120 [deg] Turns: 1 [Turns] Direction: Specify Inflow/Outflow faces Select Inflow face and Outflow face.

Boundary Conditions

No setting.

Results

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

 

 

 and click [Show Numerical Summary Table] .

 

The inductance is as follows.

 

Shown below is the vectors of the magnetic field at Phase=0 [deg].

 

Shown below is the vectors of the magnetic field at Phase=120 [deg].

 

Shown below is the vectors of the magnetic field at Phase=240 [deg].

 

Shown below is the vectors of the current density at Phase=0 [deg].