絶縁被覆純鉄粉を用いた圧粉磁心のPWMインバータ励磁下における鉄損解析

抄録

Since the eddy current loss of the Soft Magnetic Composite cores (SMC cores) is smaller than that of the stacked core, it is suitable for reducing the iron loss in high frequency applications. In this study, iron loss characteristics under sinusoidal and inverter excitation conditions are evaluated for SMC core made of insulated pure iron powder. The SMC core showed lower iron loss in the frequency range of about 1 kHz or over under sinusoidal excitation and about 400 Hz or over under inverter excitation compared with the stacked core of 0.35 mm thick electrical steel sheet. Furthermore, inverter iron losses of SMC core measured under various excitation conditions and harmonic components included in the excitation waveform were analyzed and the relationship was formulated. The calculated inverter iron losses agreed with the experimental results with high accuracy.