Due to the limited space we developed a choke with thermal class F=155°C (small size, higher heating). The current of 550 Aeff at 17,5 Hz in combination with the inductance of 12 µH requires a low number of turns per unit length with big winding profiles. We accomplished this with a tape winding and proper sized Cu connectors. The harmonic, which is small compared to the basic frequency, allows a choke construction with default transformer metal sheets. The limited total losses could be redeemed and a cheap sales price as well.
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