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The most important effect of skin effect on the impedance of a single wire is the increase of the wire's resistance, and consequent losses. The effective resistance due to a current confined near the surface of a large conductor (much thicker than δ ) can be solved as if the current flowed uniformly through a layer of thickness δ based on the ...
At microwave frequencies, the skin depth is much smaller than the diameter of the strands, and the current that is forced through the inner strands induces strong eddy currents in the outer strands, which negates the benefits of litz wire to the point where it performs much worse than solid wire of the same diameter.
Stranded wire might seem to reduce this effect, since the total surface area of the strands is greater than the surface area of the equivalent solid wire, but ordinary stranded wire does not reduce the skin effect because all the strands are short-circuited together and behave as a single conductor.
TARA Labs is credited with the invention of solid-core wires for audio use because his work predates Dennis Morecroft (1984) and any of the early solid-core wires developed for use in audio in England at the time. [4] Their first commercial speaker cables were designed in 1984, the Phase II speaker cable, which was a solid core design. [5]
This improved conductivity over bare aluminum makes the copper-clad aluminium wire a good fit for radio frequency use. The skin effect is similarly exploited in copper-clad steel wire, such as the center conductors of many coaxial cables, which are commonly used for high frequency feedlines with high strength and conductivity requirements.
Seems to me a 10 metre diameter solid wire would carry a lot more current than a 8mm wire, even at a skin depth of 8mm. The cross-sectional area (carrying current) down to the skin depth is much higher for the 10 metre wire. Agreed anything thicker than 8mm might be wasteful.
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Copper wire in typical hairpin geometry. Hairpin technology is a winding technology for stators in electric motors and generators and is also used for traction applications in electric vehicles. In contrast to conventional winding technologies, the hairpin technology is based on solid, flat copper bars which are inserted into the stator stack ...
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