Litz Wire

Litz wire is stranded wire with individually insulated strands, used to reduce eddy-current losses (skin effect and proximity effect) in high-frequency (typically 5 kHz to 1 MHz) applications. Although litz wire manufacturers publish information on recommended sizes of strands for different frequencies, and on calculating losses for a given frequency and construction, the actual mangetic field in a transformer or inductor is different from what they base the calculations on. Fortunately, the correct calculations are usually quite simple. For more information, visit this list of papers on this topic and related subjects.