New IH Coils for Small-Foreign-Metal Particle Detection Using 400 kHz SiC-MOSFETs Inverter

This paper proposes new induction heating (IH) coils for 400-kHz SiC-MOSFETs high-frequency-inverter-based small-foreign-metal particles (SFMPs) detector, which can observe heated 0.15-mm-diameter SFMPs. Magnetic flux density is theoretically calculated to heat 0.15-mm-diameter SFMPs, which are commercial minimum-sized stainless-steel balls (SUS304), by 5 °C for 5 s, then confirmed by JSOL JMAG software, which is a three-dimensional full-wave electromagnetic-field simulation software. A prototype experimental setup of SFMPs detector with the newly proposed IH coils is constructed and tested. Experimental results demonstrate that the 0.15-mm-diameter SFMPs are heated by a 400-kHz SiC-MOSFETs high-frequency-inverter-based SFMPs detector with the newly proposed IH coils consisting of E- and I-shaped ferrite cores, and then, observed by a thermographic camera. The authors, thus, conclude that a 400-kHz SiC-MOSFETs high-frequency-inverter-based SFMPs detector with the newly proposed IH coils can be applied at the actual production lines of high-performance chemical films.