抄録
This paper introduces that iron losses of electrical steel sheets on inverter excitation are underestimated when insufficient sampling frequency, which is reciprocal of time interval of sampling, is chosen for magnetic characteristics evaluation. On low sampling frequency, minor loops on B-H plots (B: magnetic flux density, H: magnetic field intensity) are not constructed or becomes small, because sharp waveform of inverter voltage cannot be represented properly. Therefore, the iron losses corresponding to internal area of B-H curve become small. On the lowest sampling frequency used for this evaluation, the iron loss is underestimated about 20 %.
