Accession Number : ADA625194


Title :   Inductance Calculations of Variable Pitch Helical Inductors


Descriptive Note : Final rept. Mar 2014-May 2015


Corporate Author : ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD WEAPONS AND MATERIALS RESEARCH DIRECTORATE


Personal Author(s) : Bartkowski, Peter T ; Berning, Paul R


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a625194.pdf


Report Date : Aug 2015


Pagination or Media Count : 32


Abstract : A technique has been developed to calculate the inductance of variable pitch helicoil inductors of rectangular cross section that use a coaxial return feed along the center of the coil. The calculations discretize the coil into a series of rings of current that take into account the diffusion of current or skin depth. The inductance is a combination of each ring???s self-inductance and the mutual inductances of all the current rings. To validate the technique, a series of coils were machined from aluminum tubes and then their inductances were measured at 3 different frequencies. The calculated inductances are compared to the measured inductances.


Descriptors :   *INDUCTANCE , ALUMINUM ALLOYS , COAXIAL CONFIGURATIONS , COILS , CROSS SECTIONS , HELIXES , INDUCTORS , RINGS


Subject Categories : Electricity and Magnetism


Distribution Statement : APPROVED FOR PUBLIC RELEASE