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Showing 1 to 20 of 25 for “"Halbach"”.
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NMR of geophysical drill cores with a mobile Halbach scanner
… is devoted to a mobile NMR with an improved Halbach scanner. This is a lightweight tube-shaped magnet with sensitive volume larger and a homogeneity of the magnetic field higher than the previous prototype version. The improved Halbach scanner is used for analysis of water-saturated drill …
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Implementation of a Halbach array in a tubular linear motor
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1996.
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Analysis And Modeling Of The Eds Maglev System Based On The Halbach Permanent Magnet Array
… transportation / space launch assist system. The Halbach array due to its unique magnetic field feature has been widely used in various applications. The EDS system using Halbach arrays leads to the potential EDS system without super-conductor (SC) technology. In this thesis, the Halbach array …
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Mobile NMR for rock porosity and permeability
… and is inhomogeneous within the object. The two Halbach core-scanners enclose the samples in a large cylindrical volume with a nearly homogeneous magnetic field. Besides one-dimensional (1D) relaxation measurements which can be performed with all sensors, the second version of the Halbach …
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Design considerations and implementation of an electromechanical battery system
… battery using an outside rotor permanent magent Halbach array with hybrid magnetic bearings and heat pipe cooling. The theoretical calculations include finite element analysis. A dipole Halback array produces a uniform flux distribution inside the cylindrical statoe, where straight windings on an …
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Design of a High Specific Power Electric Machine for Turboelectric Propulsion
… In this concept, an outer rotor, tooth-and-slot Halbach array is integrated with the low pressure compressor of a low fan pressure ratio aeroengine. The specific power of the integrated compressor generator is estimated to be 14.8 kW/kg, exceeding the NASA 2030 goal for aviation applications of …
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Quadrupole Strong Focusing for Space-Charge Dominated Electron Beams in Traveling-Wave Tubes
… case for strong focusing employing a Halbach quadrupole lattice. Using realistic Permanent Magnet Quadruple (PMQ) field cancellation, the advantage of using PMQ to transport higher current densities than Permanent Periodic Magnet (PPM) lattices disappears, while other advantages for …
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Advances in studying order and dynamics in condensed matter by NMR
… low magnetic field homogeneity provided by the Halbach type of magnets is discussed. The design of modified Halbach magnets is studied in order to increase the field homogeneity. The work was focused on two types of Halbach magnets, consisting of 16 and 24 magnet blocks, respectively. Different …
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Design and Construction of a Low-Cost, Low-Field MRI System for MR Signal Acquisition
… magnets and locally sourced components. A Halbach cylinder was employed to generate the static magnetic field B0. A parallel genetic algorithm with an island model enabled efficient optimisation, yielding a simulated field strength of 50.2mT and a homogeneity of 128.73 ppmpp over a 60mm …
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Mechanical design and validation of 1 MW permanent magnet synchronous machine (PMSM)
… There are also other innovative designs such as Halbach array magnets and air gap windings. Combination of these designs does impose challenges for the mechanical design of the motor. Not only does mechanical integrity like strength need to be considered, but dynamic performance, vibration and …
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Nuclear magnetic resonance sensors and methods for chemical sensing in tissue
… use. A magnet assembly based on a linear Halbach array was developed to produce a large, remote, and uniform field. Suitable impedance matching circuitry was designed and constructed to efficiently transmit signals between NMR probes and a radiofrequency spectrometer. This system is …
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Investigation of material properties by NMR in low and high magnetic fields
… made with the help of a new mobile magnet, the Halbach magnet. The Halbach scanner has a higher sensitivity than the NMR MOUSE®. The Hahn and stimulated echoes have been implemented for diffusion measurements in a new single sided NMR sensor. The profile NMR MOUSE strong and uniform gradient …
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High-frequency, high-pole count design for improving specific power density of electric machines
… are manageable by employing air-gap windings, halbach arrays, and outer rotor topology.
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Study of Second Generation High Temperature Superconductors: Electromagnetic Characteristics and AC Loss Analysis
… Multiphysics, and found that a Superconducting Halbach Array magnet can achieve all the requirements (magnetic field properties, geometry, portability, etc.) for the LFEIT system. The optimization study of the superconducting Halbach Array magnet has been carried out on the FEM platform of …
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ENGINEERING MAGNETIC DEVICE AND NANOPARTICLES PLATFORMS TO IMPROVE DRUG ACCUMULATION AND PENETRATION IN TUMORS FOR ENHANCED CANCER TREATMENT
… an 8−magnet device arranged in an annular Halbach array. This configuration promotes radial outward movement of nanoparticles from the center of the bore due to its enhanced constant magnetic gradient. By utilizing Chlorin e6-coated magnetic nanoclusters (Ce6 clusters) with densely packed …
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Mechanical design of high frequency, high power density electric machine
… materials and technologies, such as Halbach array magnets and airgap windings. Combining these novel ideas imposed challenges onto the mechanical design of the motor, mainly because the design was optimized to thin radial builds for weight reduction, while the motor structural …
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Modeling, Manufacturing, and Experimental Validation of an Electric Machine for Aircraft Propulsion
… the air-gap field created by a segmented Halbach array rotor is derived from Maxwell’s Equations. The closed-form solution for the air-gap field matches Finite Element Analysis (FEA) to within 1% and experimental data from the manufactured prototype to within the tolerance of the …
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Design and development of functional foot for agile and dynamic legged robots
… mechanism: an electropermanent magnet with the Halbach magnet array (H-EPM). The H-EPM improves the force reduction at an air gap of the typical electropermanent magnet. Using the H-EPM and a magnetorheological elastomer, the magnetic foot design has been introduced. We provide an analytical …
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High force density linear permanent magnet motors : "electromagnetic muscle actuators"
… water-cooled motor using a tubular double-sided Halbach array of magnets, with a mass of 185 g, a stroke of 16 mm, and a magnetic repeat length of 14.5 mm. This motor generates a continuous force density of 140 N/kg, and has a motor constant of nearly 6 N/[square root]W, both higher than any …
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