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 15 of 15 for “"Coil Current"”.
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ΔB₀ Field Control in High Field MRI with Local Multcoil Shim Arrays
Local multicoil ΔB₀ shim arrays enable low-cost, simple to fabricate, and physically small, static magnetic field control in magnetic resonance imaging. The presented thesis will show frameworks for coil current calculation for homogeneity and novel selective excitation applications. As MRI RF …
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Optimum performance of solenoid injectors for direct injection of gaseous fuels in IC engines
… circuits is designed to boost the solenoid coil current for quick electromagnetic force generation to perform a fast injector opening. A capacitor incorporated in the switching circuit is used to oppose and to quickly diminish the coil current for fast injector closing. To accurately control …
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An investigation of the induction heating characteristics of powdered susceptors dispersed in a non-conducting medium
… mixture were heated by the field of an induction coil, consequently heating the resin coated sand and bonding the sand grains together.</p> <p>It was found that the type, relative amount,and particle size of the susceptor were important variables to be considered in the induction heating …
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Design of feedforward active ripple filters for power converters
… circuit which cancels or suppresses the ripple current and EMI generated by the power stage of a power converter, thus reducing the passive filtration requirements. This thesis presents the design and evaluation of various current sensing and injection methods for feedforward active filter …
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Electromagnetic nanopositioner
… actuator that applies a force linear in both coil current and displacement, replacement of the conventional metal flexures with rubber bearings, as well as power and sense electronics that can be easily integrated into a compact package. A prototype of this class of nanopositioner with 100,pm …
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Development of nanostructured PVD coatings for total knee replacement joints using HIPIMS.
… magnetron sputtering system equipped with direct current (DC) and HIPIMS power supplies was used for this purpose. Initially, Plasma diagnostics were carried out using optical emission spectroscopy (OES) while sputtering Ti target in Ar + N2 atmosphere by utilizing various HIP IMS/conventional …
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Purification of metals through filtration and electromagnetic separation
… efficiency was significantly improved by higher coil current and longer separation time. Higher frequency also improved particle separation efficiency but was less significant than current or separation time. Filtration results showed that depth filtration of aluminum involves the contribution of …
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Equilibrium and stability studies of plasmas confined in a dipole magnetic field using magnetic measurements
… first experiment of its kind to use a levitated current ring to confine a plasma in a dipole magnetic field. Unlike most other confinement devices, plasma compressibility stabilizes and allows the plasma to attain a peak beta on the order of unity. Various magnetic sensors have been designed, …
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A distributed electromechanical spine for bio-inspired robots
… to interact with their surroundings. Although current bio-inspired robots perform well, their performance is limited due to the lack of a flexible spine. A spine provides an animal's agility, a wide range of motion, balance, and efficiency. It can be created using motors, which have been widely …
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Diagnostics and modelling of an inductively coupled RF low-pressure low-temperature plasma
… inductively coupled plasma using the external coil configuration used in the experimental work. Given fixed external RF coil current and voltage and the measured plasma density profile, Maxwell's equations and magnetohydrodynamical (MHD) fluid equations are used to calculate the self-consistent …
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Investigation on no-load mechanical endurance and electrical degradation of a circuit breaker model under short circuit current interruption
… mechanism. The conventional measurement, e.g. coil current, contact timing, dynamic contact resistance and pumping motor current as well as additional vibration technique were carried out in both laboratory and field test. The investigation on electrical erosion focusing on aging of nozzle and …
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6.78MHz Omnidirectional Wireless Power Transfer System for Portable Devices Application
… power transfer (WPT) with loosely coupled coils is a promising solution to deliver power to a battery in a variety of applications. Due to its convenience, wireless power transfer technology has become popular in consumer electronics. Thus far, the majority of the coupled coils in these …
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A Permanent Magnetic Dipole Reaction Sphere Actuator for Spacecraft Attitude Control
… reaction sphere prototype, 12 equidistant stator coils, each centered on one face of a dodecahedron, levitate and rotate the enclosed dipole rotor using translation and rotation feedback from 12 equidistant sensing modules, each coaxially placed within one of the coils. The dipole rotor is a 38.1 …
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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
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Senzor proudu s digitalizovaným výstupním signálem
Cílem této bakalářské práce je nastudovat problematiku měření proudů v sítích nízkého napětí pomocí Rogowskeho cívky a podrobně se seznámit s požadavky na elektronický senzor proudu (ECT) s digitálním výstupem. Dále ověřit základní parametry Rogowskeho cívky jako senzoru proudu a vytvoření její …