TEAM Benchmark Family: Problem 21 Field Loss in Power Transformer
Shielding can be used to substantially reduce magnetic field strengths outside of a transformer. Considerations are needed to determine the type of shielding required; its electric properties and geometry.
The International Compumag Society has put forth a set of problems designed for Testing Electromagnetic Analysis Methods (T.E.A.M.). Within this group is a benchmark problem for calculating loss in a shielding plate, 3-D Stray Field Loss Model: Benchmark Family.
Presented here is MagNet's analysis of the first set of configurations from the family of benchmarks involving two exciting coils directed in opposite directions and shielded by magnetic steel plates. The magnetic shield has two configurations; one large magnetic steel plate or two smaller magnetic steel plates where one of the plates has a rectangular hole. The nonlinear eddy current and hysteresis losses are compared in both configurations to measured results. By taking advantage of symmetry present in the geometry, only a quarter model is used in the first configurations and a half model in the second. These simplifications decrease the time required to complete the simulation.
Results
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