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Showing 1 to 20 of 43 for “"magnetic coupling"”.
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Magnetic coupling in (GaMn)As ferromagnetic semiconductors – studied by soft x-ray spectroscopy
Durch die Dotierung von Gallium Arsenid mit Mangan werden lokale magnetische Momente implantiert und gleichzeitig Ladungsträger (Valenzband Löcher) erzeugt, welche eine langreichweitige ferromagnetische Kopplung zwischen den einzelnen Mangan Ionen herstellen können. In dieser Arbeit wurde die …
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Magnetic Coupling between a “Hot Jupiter” Extrasolar Planet and Its Pre-Main-Sequence Central Star
… short-period pile-up of extrasolar planets, the magnetic torque of a pre-main-sequence central star on a single orbiting "hot Jupiter" planet is calculated. The star's magnetic field is modeled as a dipole magnetic field. The time-dependent stellar radius is calculated for four different stellar …
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THEORETICAL AND EXPERIMENTAL INVESTIGATIONS OF THE CROSSMAGNETIZING PHENOMENON IN SATURATED SYNCHRONOUS MACHINES
… recognization of the important role of the magnetic coupling between the direct- and quadrature-axis (the cross-magnetizing phenomenon) in the analysis of saturated synchronous machines. In this context, it has been noticed that there are large discrepancies between their measured and …
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Nanopartículas magnéticas adsorvidas em superfícies metálicas
Understand the physical properties of magnetic systems adsorbed in metallic surfaces is quite important for technological and scientific reasons. Here, this kind of system is studied theoretically by first principles calculations, based on the density functional theory (DFT), as well as by tight …
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Smart Ocular Implant for Monitoring IOP in Glaucoma Patients
… transmitter coil is designed to maximise the magnetic coupling with a corresponding implanted sensor coil. A simple half-bridge inverter module is developed to drive the transmitter coil through a compensation network, thereby exciting the sensor coil. The design is optimised using …
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New Receiver Coil for Enhanced Misalignment Tolerance in Wireless Charging of Hybrid/Electric Vehicles
… between the emitter and receiver coil. Values of magnetic coupling between these two can help improve the efficiency of the entire system, but the rate of variation of the same when coils get misaligned determines the available charging zone. If the coupling variation is large, the charging zone …
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Design, construction and characterization OFA magnetic augmented rotation system (MARS) based wind turbine
Magnetic Augmented Rotation System (MARS) works by magnetic field coupling, to transfer torque from the driver to the rotor without contact. This characteristic has significant applications to the wind turbine but research in combination of MARS and wind turbine has not been done in the literature. …
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Magnetic augmented rotation system (MARS ) - properties and performance
Magnetic Augmented Rotation System (MARS) is proposed as a system for conversion of mechanical energy into electrical energy. It works on the principle of magnetic coupling. Because it is contactless, compared with traditional gears, it increases the transfer efficiency from a driver to a rotor; …
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Application Considerations of Multiphase Monolithic Buck Regulators with Coupled Inductors
… coupled inductors to take advantage of its magnetic coupling between different phases to achieve minimal output ripples and ultra-fast transient response. The results of this research emphasize performance differences in control loop and transient response, output ripple, efficiency, and …
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Transition metal implanted ZnO: a correlation between structure and magnetism
… is often found in potential diluted magnetic semiconductor systems. However, many authors question the origin of this ferromagnetism, i.e. if the observed ferromagnetism stems from ferromagnetic precipitates rather than from carriermediated magnetic coupling of ionic impurities, as …
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Einfluß der magnetischen Dipolkopplung auf den Tunnelmagnetowiderstand in Schichtsystemen und strukturierten Elementen
We have studied the effect of the dipolar magnetic coupling (also known as Néel coupling or "orange-peel" coupling) in tunneling magnetoresistive (TMR) elements. With an in situ scanning tunneling microscope we directly accessed the roughness of the films and found a close correspondence …
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Correlation of Structure and Magnetic Properties in Charge-Transfer Salt Molecular Magnets Composed of Decamethylmetallocene Electron Donors and Organic Electron Acceptors
… salts which allows for the comparison of magnetic properties based on the length or size of the alkyl group of the dialkyl dicyanofumarate. Some trends were established based on the magnetic properties of the homologous series including ordering temperature/bulkiness of the alkyl group and …
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Protection Against Ungrounded Single Phase Open Circuit Faults in 3-Phase Distribution Transformers
… voltage due to a variety of effects including magnetic coupling, voltage loops and loading effects. Operating experience in the nuclear power industry has shown that the results can be catastrophic especially considering the impacts to motor loads. Impacts can result in unavailability of …
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Optimization of Near Field Coupling for Efficient Power Transfer Utilizing Multiple Coupling Structures
… number of options, including near field resonant magnetic coupling. Previous research with mid-range (dâ 4r) wireless power transfer has resulted in coupling efficiencies of close to 40%. In order to increase efficiency in transfer a more directive transmission system was developed using a phased …
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Embedded Antennas In Concrete For Application In Wireless Sensors
… periodically through near-field transformer-like magnetic coupling. These antennas are our research area. Firstly, from discrete measured data of dielectric constant and conductivity published in literatures, we developed the formula to extend their using range to all continuous available moisture …
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A simple transformer-based resonator architecture for low phase noise LC oscillators
… The important aspect of this technique is that magnetic coupling between the windings of an integrated transformer increases their effective inductance while leaving their series resistance relatively unchanged. As a result, the Q of these inductive elements is increased and the phase noise …
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Passive Balancing of Switching Transients between Paralleled SiC MOSFETs
… inductance, which can be reduced by negative magnetic coupling. Perfect coupling between power-source inductors would enable current matching without penalty on voltage stress. Common-source inductance (Lcm) is effective in dynamic balancing, but at the expense of higher switching loss. It is …
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The characterisation of magnetic couplings and the development of a thruster module for an ROV
… of thruster modules and the characterisation of magnetic couplings for a Remotely Operated Underwater Vehicle (ROV). The dissertation begins with an introduction to the Seahog ROV developed at the University of Cape Town's Robotics and Agents Research Laboratory (RARL). The history, relevance and …
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Thermal-magnetic finite element model of a high frequency transformer
In high-frequency power transformers, magnetic material properties cannot be assumed to be constant. These properties vary with frequency, temperature, and magnetic flux density. Heat generation is, in turn, a function of the magnetic permeability, magnetic flux density, and frequency. Current …
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Analysis And Optimal Design Method of LCLC Resonant Tank for Bidirectional DC-DC Resonant Converter And LCLC Resonant Converter's Efficiency Performance in Wireless Low Power Transfer Applications
… in resonant tank parameters occurring due to magnetic coupling variation. </p>
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