Abstract：Frequency dependences and DC-bias on the quality factor of Sendust powder cores were tested by LCR. It was found that, the quality factor of Sendust powder cores first increased with increasing frequency and then it continuously decreased upon further increasing frequency. Powder cores with effective permeability of 125 attained the highest quality factor at about 30 kHz, and effective permeability of 60 at about 80 kHz. The quality factor first increased with the DC-bias magnetic field, and then it continuously decreased upon further increasing the DC-bias magnetic field for two samples. Powder cores attained the highest quality factor at different DC-bias magnetic field at variation frequency. Powder cores with effective permeability of 125 attained the highest quality at 1571, 3927 A/m and 5890 A/m at 50, 100 kHz and 200 kHz, effective permeability of 60 attained the highest quality at 4712, 5498 A/m and 7069 A/m at 150, 200 kHz and 250 kHz.
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2014, Vol. 21 
