AC Characteristics of Helical Coilexamples|products|Murata Software Co., Ltd.

Example11 AC Characteristics of Helical Coil

General

  • AC current flows in helical coil.
     

  • The coil’s inductance and impedance, and the vectors of the current density are also solved.
     

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

 

Analysis Space

Item

Settings

Analysis Space

3D

Model unit

mm

Analysis Conditions

Item

Settings

Solvers

Magnetic Field Analysis [Gauss]

Analysis Type

Harmonic analysis

Options

N/A

The frequency of the current is set to 50[kHz].

Tab

Setting Item

Settings

Mesh Tab

Frequency-Dependent Meshing

Reference frequency: 50×10^3[Hz]

Harmonic analysis

Sweep Type

Single frequency

Frequency

50×10^3[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

A helical solid body Coil (coil) is defined.

Its inflow/outflow faces are extended to the outside of the ambient air. They contact the electric wall of outer boundary condition.

In the magnetic field harmonic analysis, inflow/outflow faces must be outside of the ambient air. (for the purpose of calculation with FEM)

In this Exercise, ambient air is set to be created automatically. Therefore, the inflow/outflow faces are extended to the outside of ambient air.

Body Attributes and Materials

Body Number/Type

Body Attribute Name

Material Name

0/Solid

Coil

008_Cu *

3/Solid

Coil

008_Cu *

4/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: AC

Current: 1[A]

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

 

 

 click [Table] .

 

The inductance of the coil is output as follows.

 

 

The impedance is as follows.

 

 

 

The vectors of the magnetic field are shown below.

 

The vectors of the current density are shown below.

Unlike the static analysis, the current is distributed inside the coil and highly concentrated near the surface.