Example25 Force between Magnet and Electromagnet (Axisymmetric Analysis)

General

This exercise solves Example 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
Mag	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

Boundary Conditions

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.

See other Magnetic Analysis examples.