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 43 for “"Magnetic Core"”.
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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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Modeling and Design of a Three-dimensional Inductor with Magnetic Core
… inductors with new geometries housing magnetic cores that show an enhanced inductance compared to the air core coil. In this thesis, we discuss the design of a three-dimensional spiral inductor with a Co-Fe nanoparticle core that will be fabricated as per the process rules set by VT MT …
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Development of an adaptive weight unit.
… an adaptive weight unit based on the transfluxor magnetic core. The search for multi-level or analog storage devices has led to the study and development of many different types of storage mechanisms, ranging from mechanical and chemical devices to magnetic core devices. This thesis presents the …
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Design, implementation, and evaluation of high-efficiency high-power radio-frequency inductors
… have traditionally been implemented as air-core solenoids to avoid high-frequency core loss. These designs have more turns than magnetic-core inductors and thus high copper loss; their high loss and large size are both major contributors to the overall system efficiency and size. One …
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Magnetic fields in the early solar system
The first magnetic fields in the solar system were embedded in the ionized gas of the protoplanetary disk itself. Soon after, newly formed protoplanets may have harbored magnetic core dynamos. Paleomagnetic analysis of ancient samples permits direct constraints on these early solar system magnetic …
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Mechanistic modeling of increased oxygen transport using functionalized magnetic fluids in bioreactors
… this thesis focuses on the use of functionalized magnetic nanoparticles to enhance gas-liquid oxygen transfer. The nanoparticles have a magnetic core and an organic coating. The magnetic core makes it possible to easily recover the fluid by passing it through a magnetic field, and the coating …
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Core Material Evaluation for Magnetic Energy Harvester Applications
Current transformer magnetic energy harvesters (CTMEHs) harvest magnetic energy from an AC current-carrying conductor and convert this energy into usable electrical energy for use by various low-power devices, such as sensors and microcontrollers. The amount of power harvested by CTMEHs is …
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Composite Nanoparticle Materials for Electromagnetics
… as a viable replacement for conventionally used magnetic core materials in various electromagnetic applications. Conventional linear and rotary electric motors, generators and actuators are too bulky to be used in lightweight applications. The major component of weight in electromagnetic devices …
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Electrochemical materials for integrated magnetics
Next generation microinductors with magnetically enhanced VIA technology hold great promise for power converter applications in broad technology domains such as automotive, space, high-end computing, mobile devices, radio frequency (RF), artificial intelligence (AI) and the internet of things …
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Clamp–On Magnetic Energy Harvesting
… on-site from available ambient energy. Magnetic energy harvesters, configured as current transformers (CTs), extract energy from the magnetic fields surrounding current-carrying power lines. This thesis proposes generalized analytical methods for modeling magnetic energy harvester …
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Investigation Of Temperature Dependent Magnetic Hyperthermia In Fe3o4 Ferrofluids
<p>Magnetic nanoparticles (MNPs) of Fe3O4 and gamma-Fe2O3 have been exploited in the biomedical fields for imaging, targeted drug delivery and magnetic hyperthermia. Magnetic hyperthermia (MHT), the production of heat using ferrofluids, colloidal suspensions of MNPs, in an external AC magnetic …
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Very High Frequency Integrated POL for CPUs
… a smaller footprint occupation, and the hybrid core structure for non-linear inductance control. Moreover, as an important category of the POL converter, the voltage regulator (VR) serves an important role in powering processors in today's electronics. The multi-core processors are widely used …
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Design and evaluation of a very high frequency dc/dc converter
… requirements of the converter allow the use of coreless inductors, thereby eliminating magnetic core loss and introducing the possibility of integration. The target application of the converter is the automotive industry, but the design presented here can be used in a broad range of applications …
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An experimental study and modeling of Transformer-Coupled Toroidal Plasma processing of materials
… chamber by transformer coupling using a magnetic core. The objectives of the thesis are (1) to characterize the TCTP source, (2) to understand the kinetics and limitations of species production by the remote TCTP source, and (3) to construct a generic model of plasma-surface interactions. …
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Characterizing and modeling methods for power converters
… transistor (HEMT), and the magnetic core in an inductor.</p><p>For the characterization of switching components, a set of test fixtures are designed to characterize the equivalent circuit of Si MOSFETs and GaN HEMTs. The frequency-dependent behaviors of Si MOSFETs are …
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A distributed electromechanical spine for bio-inspired robots
… spinal structure and muscles by combining a magnetic core and two coils in a module. Six modules are connected in series to form a spine. A single module and the entire system represent a vertebra and vertebrae, respectively. The proposed actuator utilizes electromagnetic force induced by …
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Maximizing Flexibility and Efficacy of Undersea Wireless Power Transfer Systems
… air. Finally, the study investigates the use of magnetic cores in WPT systems for EM shielding and field-shaping characteristics. A design methodology is introduced to rank material properties based on the desired system performance characteristics. Suggested materials are then chosen according …
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Investigation of Multiphase Coupled Inductor Topologies for Point-of-Load Applications
… limited transient response with a large size of magnetic components. To overcome these issues, coupled inductor is proposed to realize a small steady-state current ripple, a fast transient response, and a small inductor size at the same time. Although lots of studies have been conducted in the …
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Design and fabrication of electromagnetic micro-relays using the UV-LIGA technique
… a research effort to microfabricate an electromagnetic relay for power applications using a multilayer UV-LIGA process. A mechanically wrapped coil was used and very simple design for the magnetic circuit was adopted to increase the design flexibility and performances. The broad material …
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