Evaluation of ferrite, nickel-iron, amorphous metal, and nanocrystalline magnetic materials for pulsed power
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A significant challenge in the design of circuits utilizing a magnetic switch is the accurate prediction of the magnetization dynamics. Several theoretical models are found in the literature for this purpose, however each is limited by assumptions restricting the model to a specific magnetic material, loss mechanism, or parameter space [1][2][3]. Therefore, an accurate prediction of the magnetization dynamics for a specific material is best obtained by consulting an empirical database. The empirical database found in the literature is extensive for many conventional magnetic materials, however the emergence of a new class of nanocrystalline magnetic materials has provided the motivation to conduct experiments to examine and characterize the magnetization dynamics of these emerging materials [1][4]. Experiments were conducted at the University of Missouri-Columbia to examine and characterize the magnetization dynamics of several conventional and emerging magnetic materials that included ferrite and several nickel-iron, amorphous metal, and nanocrystalline magnetic alloys. Two separate experiments were conducted, the first to replicate the '1 cos( )t [lowercase omega]' magnetic excitation inherent to pulse compression applications, and the second to replicate the square-pulse magnetic excitation inherent to a number of pulsed power applications. The '1 cos( )t [lowercase omega]' magnetic excitation experiments utilized the parameter space summarized in Table 1-1, whereas the square-pulse excitation experiments utilized the parameter space summarized in Table 1-2. For both experiments, a test stand was developed to generate an excitation pulse of the desired form and amplitude across the winding on a magnetic core. Also for both experiments, high fidelity diagnostics were utilized to measure the voltage and current of the saturating magnetic core in order to generate the BH curve and energy losses. The first chapter will discuss the previous work in this area, many important characteristics of the magnetic switch, as well as several applications that utilize the magnetic switch. The second chapter will examine theoretical ferromagnetism and will discuss the material properties of the magnetic cores evaluated in the experiments. The third chapter examines the '1 cos( )t [lowercase omega]' magnetic excitation experiments including the experimental objectives, test stand, data analysis, and experimental results. The fourth chapter examines similar aspects from the square-pulse magnetic excitation test stand. Finally, conclusions will follow and appendices will include the core reset current calculations, the physical dimensions of the cores evaluated, and the data analysis programs written in Matlab.--Background.
File was author-supplied in 2025
File was author-supplied in 2025
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M.S.