Title page for ETD etd-12142000-123419


Type of Document Master's Thesis
Author Fielder, Robert Stanley
URN etd-12142000-123419
Title Computer Aided Design and Fabrication of Magnetic Composite Multilayer Inductors
Degree Master of Science
Department Materials Science and Engineering
Advisory Committee
Advisor Name Title
Lu, Guo-Quan Committee Chair
Brown, Jesse J. Jr. Committee Co-Chair
Suchicital, Carlos T. A. Committee Member
van Wyk, Jacobus Daniel Committee Member
Keywords
  • Computer Modeling
  • Ferrite
  • Inductor
  • Multilayer
  • Magnetic
Date of Defense 2000-12-04
Availability unrestricted
Abstract
Computer modeling using finite element analysis (FEA) was performed to examine the effects of constructing multilayered thick film inductors using an artificially modulated magnetic composite structure. It was found that selectively introducing regions of low permeability material increased both the inductance and the current carrying capacity compared to thick film inductors made with single material magnetic cores. Permeabilities of the composite cores ranged from 1 to 220. The frequency for the models ranged from 0 to 5.0 MHz. Experimental devices were constructed using thick film screen printing techniques and characterized to validate the models and to determine the effectiveness of the design modifications. Quantitative comparisons were made between inductors of single permeability cores with inductors produced with magnetic composite cores. It was found that significant (> 130%) increases could be gained in saturation current with only a 12% decrease in inductance. It was found that the key parameters affecting performance were 1) the placement of low permeability regions, 2) the extent of non-uniform flux distribution within the structure, and 3) the volume fraction of low permeability material.
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