Inductance Calculations of Variable Pitch Helical Inductors
Final rept. Mar 2014-May 2015
ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD WEAPONS AND MATERIALS RESEARCH DIRECTORATE
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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 rings 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.
- Electricity and Magnetism