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 12 of 12 for “"Leakage flux"”.
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Control and monitoring of Variable- Leakage-Flux IPMSM
El interés en vehículos eléctricos (EVs) y vehículos híbridos (HEVs) ha aumentado sustancialmente durante las últimas dos décadas debido a la introducción de nuevas regulaciones motivadas por el cambio climático. EVs y HEVs fueron usados en los inicios del siglo 20, pero fueron derrotados por los …
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Induction motor fault recognition.
… parameters such as vibration, line current and leakage flux which alter during machine faults. Initially a survey was conducted to determine which machine failures were of concern to industrial operators. Faults analysed in this thesis include rotor bar faults, unbalanced supply, eccentricity …
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Optimal Design of MHz LLC Converter for 48V Bus Converter Application
… and a merged winding structure is used for flux cancellation, which effectively reduces the AC winding losses. A new fully interleaved termination and via design is proposed. It achieves significant reduction in loss and leakage flux. In addition, to study the current sharing of parallel …
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Development of a Magnetic Field Sensor System for Nondestructive Evaluation of Reinforcing Steel in Prestressed Concrete Bridge Members
… inspection system to measure main magnetic flux (MMF) and magnetic leakage flux (MFL) signals, to evaluate the condition of prestressing stands. A proof-of-concept has been established using a prototype electromagnet-sensor, showing a direct relationship between the cross-sectional area of …
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On-line condition monitoring and detection of stator and rotor faults in induction motors.
… three types of sensor signals (i.e. current, leakage flux, and vibration) under different loading conditions. The work is based on an extensive series of sensor measurements taken using a number of nominally identical healthy machines (2.2 kW) and custom-modified machines (2.2 kW) with …
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High Frequency, High Current 3D Integrated Point-of-Load Module
… the active components are placed. The lateral flux inductor is proposed to achieve both a low profile and high power density. Generally, the size of the inductor can be continuously shrunk by raising the switching frequency. The emerging gallium-nitride (GaN) power devices enable the creation …
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PCB Integrated Matrix Transformer for a High-Power Single Phase CLLC Resonant Converter with the Novel Application of Circular Orthogonal Parallel Airgaps
… matrix transformer with integrated controllable leakage inductance for a single-phase 11kW 250kHz bi-directional DC/DC CLLC resonant converter (1PCLLC) for use in electric vehicle on-board chargers (OBC's). By utilizing a variable DC-link, system efficiency is maximized and regulated according to …
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Modelling wind-driven inter-ocean exchange in the greater Agulhas with the regional ocean modelling system
… to investigate (1) the structure of the Agulhas leakage, (2) the dynamical link between the leakage and the Agulhas Current, and (3) the sensitivity of this link to changes in the regional wind field. Both configurations span the Indian Ocean and South East Atlantic Ocean (29° W - 115° E, 48.25° …
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Measurements and finite element modelling of transformer flux with dc and power frequency current
… could lead to overheating due to excessive stray flux. Finite element matrix (FEM) modelling software is of considerable use in transformer engineering as it is able to solve electromagnetic fields in transformers. For many problems, typically involving only specific parts of a transformer, fairly …
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Integrated magnetic components for high-power high-current dc-dc converters
… allowing for the reduction of external leakage inductance, which is a problem for many traditional IM designs, such as the EE IM. Magnetic poles are incorporated to help shape and contain the leakage flux within the core window. These magnetic poles have the added benefit of minimizing …
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Design and Integration Techniques for High-Frequency PCB-Based Magnetics in Resonant Converters
… 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 relevant. …
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High-frequency Power Conversion for Medium Voltage Power Electronics Interfaces
… structure is introduced to balance the magnetic flux within the transformer core. This balanced distribution of the magnetic field helps reduce leakage flux into the air, subsequently reducing winding losses. The dissertation also suggests a sandwich winding structure to decrease the …