IH Cooking Heaterexamples|products|Murata Software Co., Ltd.

Example2 IH Cooking Heater

General

  • This is an example of the magnetic field-thermal analysis.
     

  • The joule loss due to the induction current is solved by magnetic analysis. The resulting temperature rise is calculated by thermal analysis.

     

  • The vectors of the magnetic field and the temperature distribution by the heating are viewed.
     

  • 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]

Thermal Analysis [Watt]

Analysis Type

Magnetic field analysis: Harmonic analysis

Thermal analysis: Steady-state analysis

Options

N/A

 

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

Tab

Setting Item

Settings

Harmonic analysis

Frequency

Minimum: 10×10^3[Hz]

Maximum: 10×10^3[Hz]

Step

Linear step: Division number: 0

 

Set the Mesh Tab as follows.

Select “Apply the surface impedance boundary” for faster calculation.

“Apply the surface impedance boundary” is selectable when there is no induced current on the conductor.

See “Frequency-Dependent Meshing” of [Mesh Tab].

Tab

Setting Item

Settings

Mesh

Meshing Setup

Automatically set the general mesh size: Deselect

General mesh size: 20[mm]

Frequency-Dependent Meshing

Reference frequency: 10×10^3[Hz]

Surface treatment for conductors: Apply the surface impedance boundary

Model

Solid bodies of a frying pan (Metal) and a coil (Coil) are defined.

The automatically created ambient air is analyzed only in the magnetic field analysis, not in the thermal analysis.

Body Attributes and Materials

Finer meshes are set on the area where the magnetic field changes drastically.

Body Number/Type

Body Attribute Name

Material Name

1/Solid

Coil1

008_Cu *

3/Solid

Coil2

008_Cu *

11/Solid

METAL

METAL

10/Solid

Handle

Wood

* Available from the Material DB

 

The material properties are set up as follows:

Material Name

Tab

Properties

Wood

Thermal Conductivity

Thermal Conductivity: 0.5[W/m/deg]

METAL

Permeability

Relative Permeability: 5×10^3

Conductivity

Conductivity Type: Conductor

Conductivity: 1×10^7

Thermal Conductivity

Thermal Conductivity: 80

 

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

The analysis domain is the magnetic field analysis only as Coil is not used in the thermal analysis.

Body Attribute Name

Tab

Settings

Coil

Current

Waveform: AC

Current: 10[A]

Turns: 20[Turns]

Induced current: N/A

Direction: Loop Coil/Magnetic Field Direction

Direction Vector of Magnetic Field: X=0, Y=0, Z=1

Analysis Domain

For use in magnetic field analysis

Boundary Conditions

“Natural convection (automatic calculation)” is set on the outer boundary condition (surrounding the frying pan in the case of the thermal analysis).

Boundary Condition Name/Topology

Tab

Boundary Condition Type

Settings

Outer Boundary Condition *

Thermal

Heat Transfer/Ambient Radiation

Natural convection (automatic calculation)

Room Temperature : 25[deg]

 

To set Outer Boundary Condition, go to the [Model] tab
 


 

and click [Outer Boundary Condition] .

Results

The vectors of the magnetic field are shown below.

 

The vectors of the current density are shown below.

The eddy current is induced in the pan.

 

The temperature contour as a result of Watt is shown below.

The temperature goes up to around 110[deg].