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# Example25Force between Magnet and Electromagnet (Axisymmetric Analysis)

### General

• This exercise solves Exercise 7 with axisymmetric analysis.
The number of meshes is much less with axisymmetric models, so the simulation time is shorter.

• The electromagnetic force, the current density, and the vectors of magnetic field and the magnetic flux density are solved.

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

### Analysis Space

 Item Settings Analysis Space Axisymmetric Model unit mm

### Analysis Conditions

 Item Settings Solver Magnetic Field Analysis [Gauss] Analysis Type Static analysis Options N/A

### Model

A cylindrical magnet is placed on top of the iron core (Fe) of the electromagnet.

Mesh size is set at 1[mm] as the magnetic field changes drastically between the magnets.

• Set the gap between the bodies and mesh size properly to obtain valid calculation results.
See [Calculation of the Electromagnetic Force] for more details.

### Body Attributes and Materials

 Body Number/Type Body Attribute Name Material Name 0/Sheet Core Core 2/Sheet Coil 008_Cu * 1/Sheet Mag Mag

* Available from the Material DB

The material properties are set up as follows:

 Material Name Tab Properties Mag Permeability Material Type: Permanent Magnet Magnet Magnetization Strength: 0.5 Core Permeability Relative Permeability: 5×10^3

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

 Body Attribute Name Tab Settings Coil Current Waveform: Constant Current: 1[A] Turns: 100[Turns] Direction: +Y direction

No setting.

### Results

To see the electromagnetic force, go to the [Results] tab

click [Table] .

Two magnets are pulling each other with the approximate force of 1.2[N] in the Z direction.

Shown below are the vectors of the current density flowing through the loop coil.

The vectors of the magnetic field are shown below.

The vectors of the magnetic flux density are shown below.

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