Home / Examples / Magnetic Analysis (Gauss, Static Analysis/Harmonic analysis) / Example 8: Inductance of Helical Coil

Example 8: Inductance of Helical Coil

General

The inductance of a helical coil is solved.
The vectors of the magnetic field and the magnetic flux density are also 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

Set the Mesh Tab as follows.

Tab

Setting Item

Settings

Mesh

Meshing Setup

Automatically set the general mesh size: Deselect

General Mesh Size: 2 [mm]

Model

A helical solid body Coil (coil) is defined.

Instead of creating the helical shape, a model with specified number of turns (bulk coil) will be effective for the coil with high number of turns (100s, 1000s)
See [Example 10: Inductance of Helical Coil (The Number of Turns Specified)] for more details.

Body Attributes and Materials

Body Number/Type	Body Attribute Name	Material Name
0/Solid	Coil	008_Cu *

* Available from the material DB

Body attribute is set up as follows to apply current to the coil.

Body Attribute Name

Tab

Settings

Coil

Current

Waveform: Constant

Current: 1 [A]

Turns: 1 [Turns]

Direction: Specify Inflow/Outflow faces (In the Air Box):

Select inflow face and outflow face.

Boundary Conditions

No setting.

Results

To see the results of inductance calculation, 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 on ZX plane are shown below.

The magnetic field inside coil is directing the Z- direction.

The vectors of the current density are shown below.

The current is flowing as set for the coil.