Improvements of Preisach model for soft magnetic materials, experiments on filtering of input excitation signal

Identification of Preisach model supposes a perfect experiment. One condition is that prescribed harmonic current without any errors flows in the toroid primary winding. The condition can be ensured by a suitable filter that was designed after the complete analysis of sources of signal errors. The filter was analysed by the use of circuit theory and a very simple experiment was realized for its measurement. Good agreement between experiment and simulation was found and small deviations explained. The filter significantly reduces all the errors in primary part of apparatus and improves the Preisach model simulation results.