Reluctance of Long Solenoids with Extended Core

The system studied here uses an array of parallel-connected, voltage-driven coils distributed along the solenoid core to control the magnetic flux. The ends of the core are extended, and thus take the form of magnetic poles driving magnetic flux through the air return path. When these poles are sphe...

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Bibliographic Details
Published in2022 Joint MMM-Intermag Conference (INTERMAG) pp. 1 - 4
Main Authors Sherwali, Ahmed, Dunford, William G.
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.01.2022
Subjects
Coils
extended core
Ferrites
linear current density
long solenoid
Magnetic cores
Magnetic flux
measurement
Permeability
Permeability measurement
reluctance
simulation
Solenoids
Steel
voltage-driven
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Summary:The system studied here uses an array of parallel-connected, voltage-driven coils distributed along the solenoid core to control the magnetic flux. The ends of the core are extended, and thus take the form of magnetic poles driving magnetic flux through the air return path. When these poles are spherical and infinitely permeable an analytical expression can be obtained for the effective end return reluctance. This paper considers a more practical example and shows the reluctance of cylindrical core ends with a known permeability, and validates the results through measurements. It goes further to show how the linear current density of each coil depends on the position of the coil on the core and the core material.
DOI:10.1109/INTERMAG39746.2022.9827707