Abstract
The problem of waveform distortion in high-frequency magnetization of nanocrystalline alloys has been discussed and analyzed in this paper. By measuring the sample in a rotational single sheet tester, the distortion caused by the dc bias field is largely reduced. A robust control algorithm based on model-free control is developed to keep the magnetic flux density sinusoidal when the materials are magnetized to saturated at high frequencies. Finally, the vector magnetic properties of nanocrystalline alloys are measured after adjusting the waveforms. The losses from 2 to 10 kHz in the casting direction and the transverse direction are calculated and compared.
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