![]() Where L S is the current-sheet inductance described above and An American physicist Edward Bennett Rosa (1873–1921) of the American National Bureau of Standards (NBS, now National Bureau of Standards and Technology, NIST) developed the so-called round wire corrections for the formula above in the form ( formula 10.1 in David W Knight article): ![]() It is a very good approximation for round wire coils with many closely spaced turns. The current sheet here means that the coil is wound with very thin tape wire with no gaps between adjacent turns. This formula is valid only for a solenoidal current sheet. ![]() Weaver’s article Numerical Methods for Inductance Calculation is used for calculations of inductance L S: A single-layer inductor is shown in the picture above: D c is the coil diameter, D is the coil former diameter, l is the coil length, p is the coil pitch, d is the wire without insulation diameter and d i is the wire with insulation diameter.
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