Measurements and estimation of the complex valued permeability of magnetic steel
2015 (English)Report (Other academic)
This report is intended as a tutorial on electromagnetic modeling to measure and estimate the complex valued relative permeability of magnetic steel. The main application is with the estimation of the electromagnetic material parameters of the armour wires used with high-voltage AC power cables.
When the magnetic field intensity is sufficiently far from saturating the magnetic steel, the magnetic hysteresis phenomena can be approximated by using a linearization approach based on a complex valued (and frequency and amplitude dependent) relative permeability. In the report it is demonstrated how the complex valued permeability of magnetic steel can be efficiently estimated in the presence of a strong skin-effect. This is achieved by using a simple transformer coil built on the magnetic steel to be tested and by efficient numerical modeling based on waveguide theory and complex analysis. Numerical computations based on the Finite Element Method (FEM) and the commercial software COMSOL are employed to establish when edge effects can be ignored in the simplified analytical model.
Place, publisher, year, edition, pages
2015. , 29 p.
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject Physics, Waves and Signals
IdentifiersURN: urn:nbn:se:lnu:diva-48445OAI: oai:DiVA.org:lnu-48445DiVA: diva2:885132
FunderSwedish Foundation for Strategic Research