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 18 of 18 for “"Eddy current loss"”.
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Three-dimensional analytical model with skin effect dedicated to the prediction of the eddy current loss in the permanent magnet in permanent magnet synchronous machine
… we develop a 3-D analytical model for the eddy current loss in the permanent magnet for a permanent magnet synchronous machine with a rated power of 1 MW and an efficiency of 97%. In order to achieve an ambitious power density of 8 hp/lb, which is twice the state-of-the-art value, the …
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High-Performance High-Power Inductor Design for High-Frequency Applications
… the major contributor to the overall system’s loss and size. Even when they can achieve high Q, air-core inductors can induce electromagnetic interference (EMI) and eddy current loss in surrounding components, thus limiting system miniaturization. With the recent advancements in …
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Design and Multi-physical Fields Analysis of High Speed Permanent Magnet Machines
… power density also results in larger power loss per unit volume; due to the small machine size, machine thermal dissipation becomes difficult. Moreover, air frictional loss rises dramatically when the rotor is in high speed operation and this may also further increase rotor temperature. …
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Technology assessment and market analysis of solid state ultracapacitors
… permittivity may be strongly distorted by the eddy current loss in the commonly used equivalent circuit characterization model and therefore does not contribute to the energy density enhancement. It is also found that the geometric dispersion of conductive particles does not contribute to the …
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Characterization of MnZn ferrite materials and finite element method for MnZn ferrite core loss calculations
… 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 published …
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Electromagnetic-thermal Characteristics of Conductor on Round Core (CORC) Cables
… as coated conductors (HTS-CCs), showing high current density in a high magnetic field, are already commercially available. As a cabling concept, Conductor on Round Core (CORC) cables consisting of a cylindrical former and multiple helically bent HTS-CCs, exhibit more significant …
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Developments and extensions of Roth's method of double Fourier series with applications to the solution of electromagnetic field problems
… conductor in a rectangular slot when the current is varying sinusoidally with time. An approximate method is also developed and compared with the exact method.The approximation is then used to consider the problem of an insulated conductor in a slot facing an air gap. We also consider the …
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Doubly-Salient Permanent Magnet Flux-Reversal-Free-Stator Switched Reluctance Machines
… proposed in this report is driven by unipolar currents and uses an asymmetric converter which is used to drive switched reluctance machines. The reason to have a new hybrid machine without the drawbacks of conventional flux-reversal-free-stator SRMs and conventional DSPMs is also described. …
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Radio frequency miniature passive devices: ferrite antennas and inductors
… and mechanical hardness, provide a low eddy current loss at high frequencies and a variety of applications in power and microwave systems. In designing ferrite passive devices, the frequency-dependent permeability and magnetic loss of ferrites play important roles in device form factor …
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Super High-speed Miniaturized Permanent Magnet Synchronous Motor
… for super-high speed applications since motor losses assume a key role in the motor drive performance limit. The considerations of the PMSM structure for cryogenic applications are also discussed. It is shown that slotless structure with multi-strand Litz-wire is favorable for super-high speeds …
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Design, analysis and prototyping of a high speed surface mounted permanent magnet machine
… Analysis (FEA) software. The estimation of core losses in high-speed machines is also of critical importance during electromagnetic design. An immense amount of research has been conducted on the estimation of core losses in machines, however, not much has been done to cover the estimation of …
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Hybrid inductive and capacitive wireless power transfer system for future transportation electrification
… DC-DC efficiencies (70%-90%), no induced eddy current loss in the nearby metal objects and low cost and weight implementation. First, the thesis identifies the significant roles played by inductive and capacitive AC link designs in static and dynamic expansion of wireless electric vehicle …
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Magnetic properties measurement of new magnetic material : SOMALOY 700 (5P)
… is improving day by day and most of the 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 …
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Customisable Magnetic Components Using Nanocrystalline Flake Ribbon
… magnetic components with reduced losses, compact dimensions, lighter weight, and cost-effectiveness. Traditional methods for core customisation are cumbersome, time-consuming, and costly when producing small series of magnetic cores. Recently developed magnetic cores customised …
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Modeling, Implementation, and Simulation of Two-Winding Plate Inductor
… 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 pattern, and large fringing flux. The winding is placed near the edge of the core to …
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Control, Analysis, and Design of SiC-Based High-Frequency Soft-Switching Three-Phase Inverter/Rectifier
… inverter. Hence, in such cases, unbalanced ac currents need to be injected into the grid. When the grid voltages and the ac currents are not balanced, there is a chance for the CRM soft-switching inverter to lose its soft-switching capability. Continuous conduction mode operation emerges, …
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Theoretical Analysis and Design for the Series-Resonator Buck Converter
… becomes increasingly popular for powering high-current and low-voltage chips. The Series-Capacitor Buck (SCB) converter doubles the duty ratio and equalizes the current between the two phases. Hard switching has hindered efforts to reduce volume via increased switching frequency, although a …
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Magneto-mechanical systems for ultra-low frequency data transmission: Dynamics, losses, and driving mechanisms
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2026-12-01