November 1946 Radio-Craft
[Table of Contents]
Wax nostalgic about and learn from the history of early electronics.
See articles from Radio-Craft,
published 1929 - 1953. All copyrights are hereby acknowledged.
This iron core inductance design
chart was included along with an article in the November 1946 issue of Radio-Craft
magazine entitled, "Coils,
Cores and Magnets." Both the chart and the article were written by Mr. H. W. Schendel.
Iron-core inductors, with their high permeability and loss factor (due to eddy currents),
can only be used in power supply filtering, audio, and other relatively low frequency
(<~500 kHz) applications. Ferrite cores are compressed from slurries of
iron, nickel, cobalt, and other metallic elements, all of which experience lower
eddy current losses because they are generally not electrically conductive. With
lower permeabilities, ferrites can operate into the few hundreds of MHz realm. Physical
configuration of the core and conductors wrapped around the core can have a large
influence on the electrical parameters of power loss, impedance, frequency of operation,
linearity (due to saturation), heat dissipation, etc.
Iron-Core Inductance Design Chart
Iron-core Inductance Design Chart
Posted November 16, 2022