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# Virtual test lab for MagWeb magnetic material library

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:

• solenoid_problem_1018.pbm
• solenoid_problem_35PN250.pbm
• solenoid_problem_4750.pbm
• solenoid_problem_Cast Iron.pbm
• solenoid_problem_Ferrite J 5000.pbm
• solenoid_problem_Finemet FT3M.pbm
• solenoid_problem_Hiperco 50.pbm
• solenoid_problem_Koolmu 60 mu.pbm
• solenoid_problem_Metglas 2605SA1.pbm
• solenoid_problem_mu-metal.pbm

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.

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.

Problem:
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:

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