Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 61 for “"Core Loss"”.
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High Frequency Magnetic Core Loss Study
The core used to build power inductors and transformers are soft magnetic materials. When there is alternating external field, the magnetic moments rotate and consume energy, which is the core loss. The core loss depends on the AC flux frequency, amplitude, waveform, DC bias and temperature. These …
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Modeling magnetic core loss for sinusoidal waveforms
… model to accurately estimate or explain Core Power Losses (CPL). Theoretical advances in magnets led to many model proposals, but as these models where experimentally examined, they quickly lost their validation. Many of the current models use manufacturer's material estimates to form …
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Application of improved core loss formulations to machine design
The primary focus of this thesis is in core loss measurement and modeling techniques and their impact in machine design. In practice, steel manufacturers usually supply core loss data either at 50/60Hz, 1.5T or curves (core loss vs. flux density) at 50 and/or 60Hz. There is growing need for …
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Characterization of MnZn ferrite materials and finite element method for MnZn ferrite core loss calculations
This work presents the method of calculating the core loss in ferrite cores by using a linear and sinusoidal finite element solver based on the material property data (the complex permeability, the dielectric constant, and the AC conductivity) measured in the laboratory. Due to the lack of …
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Core loss characterization and design optimization of high-frequency power ferrite devices in power electronics applications
An impedance-based core loss measurement technique for power ferrites, the modeling and analysis of mechanisms of high-frequency losses, and design methodology for optimization for high-frequency magnetics are presented. The high-frequency losses of ferrite materials are characterized employing a …
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Modeling, Manufacturing, and Experimental Validation of an Electric Machine for Aircraft Propulsion
… 13 kW/kg [1]. The models for torque and core loss used in the design of the 1-MW machine are revised and expanded based on experimental results obtained from a partially-manufactured prototype to guide the design of future high specific-power electric machinery. To calculate the torque …
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Magnetic properties measurement of new magnetic material : SOMALOY 700 (5P)
… current electrical machines require the magnetic cores to operate at higher frequency to meet the demand of high–speed performance in catching up the aggressive technological evolution. On top of that, the researchers and engineers are aiming for the lower loss magnetic material in order to obtain …
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Enabling HF power conversion : magnetic components and a wide voltage range converter
… transient response; however, high frequency losses have limited efforts to increase frequency into the HF (3-30 MHz) regime. This thesis addresses two of the dominant frequency-dependent loss mechanisms: magnetic material core loss and switching loss. Appropriate metrics are derived to …
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Modeling, Implementation, and Simulation of Two-Winding Plate Inductor
… with winding layers sandwiched between two core plates are studied in this dissertation in order to model the self-inductance, winding loss, and core loss. The most challenging task for the plate-core inductor is to model the magnetic field with finite core dimensions, very non-uniform flux …
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Microstructure-based FE Modeling and Measurements of Magnetic Properties of Polymer Matrix-Metal Composites
… include permeability, density, resistivity, core loss density, saturation magnetization value, fluidity, sintering temperature, and others. Compared to altering the nature of solid magnetic materials to reduce space constraints, modifying the magnetic composite is preferred. The most popular …
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Control of a High-speed (<50,000 rpm) Interior Permanent Magnet Synchronous Motor
… yet their performance is often constrained by losses, parameter variations, and deadtime effects. This thesis investigates advanced field-oriented control (FOC) strategies to address these challenges, with a particular focus on improving efficiency and robustness in HS-IPMSM operation. A …
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High Frequency Isolated Power Conversion from Medium Voltage AC to Low Voltage DC
… CLLC resonant converter in terms of switching loss and conduction loss point of view. CLLC holds ZVS capability over all load range and smaller turn off current value. This is beneficial for high frequency operation and taken as our candidate. Device loss breakdown of CLLC converter is also …
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Uniform Field Distribution Using Distributed Magnetic Structure
… in this thesis. This new inductor has the core and windings configured to distribute the magnetic flux and energy relatively uniformly throughout the core volume to achieve power density higher than that of a conventional toroidal inductor. The core of this new inductor design is made of …
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Design and Integration Techniques for High-Frequency PCB-Based Magnetics in Resonant Converters
… PCB windings. Moreover, integrating the cellular cores using flux cancellation can further improve the power density. The proposed integrated magnetics can be automated in the manufacturing process. The magnetic size is reduced at this frequency, and planar magnetics using PCB winding become more …
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PRODUCTION OF NON-ORIENTED ELECTRICAL STEEL THIN STRIP SIMULATING CONDITIONS OF THE DIRECT TWIN-ROLL CASTING PROCESS
… be divided into different steps. A model for core loss is presented and used to explain the core loss results"--Abstract, p. iv</p>
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High Frequency, High Current 3D Integrated Point-of-Load Module
… FEA simulation model is developed to study the core loss of the lateral flux coupled inductor, which shows the inverse coupling is also beneficial for core loss reduction. The ceramic-based 3D integrated POL module, however, is not widely adopted in industrial products because of the relatively …
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Harmonic analysis of transformer excitation currents
Transformer core nonlinearity has been a subject of research in electrical power engineering for many decades. An accurate and simple transformer model that takes into account its iron saturation appears to be lacKing The objective of this thesis is to propose a voltage-dependent model of …
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Design Methodology and Materials for Additive Manufacturing of Magnetic Components
… extrusion-based 3D-printer to form the core part. Two magnetic fillers were used: round-shaped particles of permalloy, and flake-shaped particles of Metglas 2750M. To guide the formulation, 3D finite-element models of the composite, consisting of periodic unit cells of magnetic particles …
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Design and Processing of Ferrite Paste Feedstock for Additive Manufacturing of Power Magnetic Components
… and microstructures of the sintered ferrite cores were characterized to illustrate how the variables affect magnetic permeability. Adding sintering additives to the feedstock was selected as an easy and effective way to tailor the permeability of the ferrite feedstock. The effect of the …
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Comparison of interior permanent magnet synchronous machines for a high-speed application
… to their torque, magnetic field, airgap flux, core loss, efficiency, and cost. The radial IPM produces a smoother torque output, with lower torque ripple, and has lower losses compared to the circumferential IPM which produces a higher torque and power output. Furthermore, the circumferential …
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