How is the effecitve diameter Deff related to the proximity factor Φ?
Other inductor calculators typically employ the mean and inner physical diameters (respectively: D and D-d) to bracket the inductance of the coil between two widely-spaced theoretical limits[2]. However, it has often been alluded that the actual effective diameter Deff of a coil aught to be linked to the proximity factor Φ. In order to do away with the ambiguity of an inductance range result, a new formula [PDF] (Stroobandt’s formula?) is deduced in which the effective diameter Deff is a mere function of the proximity factor Φ. As a result of this effort, this inductance calculator will return only a single value of inductance. the effective diameter and its relation to the proximity factor Φ Although being more determined than effective diameter bracketing, inductance calculations based on this formula remain approximative for two reasons: • As is the case with diameter bracketing, this formula equally assumes that current under the proximity effect will quench while retaining a circu
