QuickField

A new approach to field modelling

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Virtual test lab for MagWeb magnetic material library

QuickField simulation example

A free QuickField library of magnetic materials from MagWeb is offered as an example of the large collection of data for hundreds of magnetic materials. For details on these magnetic materials and licensing, please visit MagWeb.US. Here we prepared a set of QuickField problems, allowing to check the convergence at different points of the BH curves for various materials. Each problem is named according to the material name in MagWeb.dms library:

Problem Type
Axisymmetric problem of DC magnetics.

Geometry

The model is construed as a set of coaxial solenoids with different surface currents, separated by air gaps.
Nonlinear permanent magnet

Given
Magnetic permeability of material - nonlinear, defined in MagWeb.dms library .

Current load Ht for each solenoid takes one of the discrete values from this list: 10 A/m, 20 A/m, 50 A/m, 100 A/m, 200 A/m, 500 A/m, 1 kA/m, 2 kA/m, 5 kA/m, 10 kA/m, 20 kA/m, 50 kA/m, 100 kA/m, 200 kA/m, 500 kA/m.

Task
Material properties in MagWeb.dms library are defined as collection of BH curves for each magnetic material. For example, the Cast Iron is presented by this curve.

In the virtual test lab we put this material as cores in number of solenoids which generate different levels of the magnetic field strength inside. We need to find flux density in each core, and compare results with corresponding BH curve of the material used.

Solution
The field is generated by a set of coils that represented by the current layers with Ht [A/m] specified.

Results for Cast Iron:

Field distribution in the virtual test lab with Cast Iron solenoid cores:
magweb materials library virtual tests

Table of calculated and defined results of B for different levels of H in the Cast Iron cores:

H, A/m B defined, T B calculated, T
100 0.175 0.175
500 0.763 0.765
1'000 1.02 1.01
2'000 1.17 1.17
10'000 1.43 1.42
20'000 1.54 1.54
100'000 1.80 1.80
200'000 1.93 1.93