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 95 for “"Permanent magnets"”.
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Interactions between polyhedral permanent magnets
… energy generation, and electric motor vehicles, permanent magnets are seeing more widespread use than ever before. They permeate our world, enabling sound generation through loudspeakers, mass data storage in the server farms keeping us online, and even the vibration motors in our pockets …
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Isotropic nanocrystalline (Nd,Pr)(Fe,Co)B permanent magnets
Nanokristalline Permanentmagnete zeigen ungewöhnliche magnetische Eigenschaften aufgrund von Oberflächen- und Grenzflächeneffekten, die verschieden von denen massiver oder mikrokristalliner Materialien sind. Diese Arbeit zeigt Ergebnisse einer systematischen Untersuchung der Beziehung zwischen …
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Microstructural changes in plasma sprayed samarium cobalt permanent magnets.
Thesis. 1975. Sc.D.--Massachusetts Institute of Technology. Dept. of Materials Science and Engineering.
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Designing mechanisms with shape memory alloys and permanent magnets
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1997.
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Ultra-low frequency wireless transmitter design using resonant oscillating permanent magnets
… using the periodic mechanical motion of permanent magnets. First, I analytically show that the physical oscillation of a permanent magnet creates a time-varying magnetic field that can be used for communication. Using this principle, I present a ULF magneto-mechanical transmitter design …
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Investigation of the Potential of Low Cost Position Tracking Using Permanent Magnets
… cheaptest imaging modalities such as ultrasound. Permanent magnet based tracking systems potentially offer adequate tracking accuracy and workspace size for limited clinical adoption. This thesis investigates the development of such a tracking system, in order to facilitate future work in …
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Corrosion and environmentally-assisted cracking of rapidly solidified neodymium-iron-boron permanent magnets
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1996.
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Use of Permanent Magnets to Improve the Seismic Behavior of Light-Framed Structures
… It is proposed to use commercially available permanent magnets, incorporated in the form of passive friction dampers, to dissipate a part of input energy induced due to strong ground motions, thereby reducing the inelastic energy dissipation demand of the lateral load resisting system. The …
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Magnetization of stacked high-Tc superconducting (HTS) tapes using flux pumping
… a very promising candidate for superconducting permanent magnets, which can be used for many applications like superconducting machines and levitation devices. However, the current magnetization methods for HTS stacks are the conventional magnetization methods developed for HTS bulks decades …
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Recycling of Rare Earth Magnets with Sulfur Based Chemistries and High Temperature Processing
Rare-earth(RE)-iron-boron permanent magnets are among the strongest permanent magnets available and power essential technologies, from wind turbines to hard disk drives. The production of the rare earth metal for these magnets currently involves significant greenhouse gas emissions and other …
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Laserless slow atom source for loading atom traps
Permanent magnets are used to selectively remove the fast atoms from an atomic beam and to guide the remaining slow atoms into a trapping region. The permanent magnets establish a quadrupole field which extends along the axis of a bent vacuum nipple. A threshold velocity is set by the radius of …
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Development and Test of a Permanent Magnet Helicon Thruster
… thruster research. A helicon thruster using permanent magnets was also designed and tested. The helicon has several advantages, but the main disadvantage is the use of electromagnets to generate the required magnetic field, requiring a high power draw. The choice of using permanent magnets is …
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Modeling and Validation of Rolling Rotor Switched Reluctance Motors for Automotive Applications
… and operation in different environments. Permanent magnet motors have been used in automotive applications for their high power density when compared to other existing types of motors. Recent years, the price of permanent magnets is sharply increasing and this trend is expected to continue …
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Control of the Doubly Salient Permanent Magnet Switched Reluctance Motor
The permanent magnet switched reluctance motor (PMSRM) is hybrid dc motor which has the potential to be more effect than the switched reluctance (SRM) and permanent magnet (PM) motors. The PMSRM has a both a salient rotor and stator with permanent magnets placed directly onto the face of common …
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Functional Materials and Device Concepts for Magnetic Sensing, Gas Detection and Energy Harvesting
… avoids magnetostrictive materials by using permanent magnets to induce mechanical strain and piezoelectric transduction to generate the electrical signal. A third configuration combines both approaches, employing permanent magnets as the magnetic phase and an electret for signal generation. …
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Electromagnetic Printhead Core for Programming Magnetic Pixels
… an electromagnet, compare to those generated by permanent magnets, before offering some praxis for programmable magnetic sheets.
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Applications of Pulse-Magnetised Bulk Superconductors
… Therefore, they have the potential to replace permanent magnets in a number of applications where there are significant advantages to increasing the strength of the magnetic field. Despite being able to reach magnetic field strengths an order of magnitude higher than permanent magnets, because …
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HIGH EFFICIENCY AXIAL DIFFRACTION OUTPUT SCHEMES FOR THE A6 RELATIVISTIC MAGNETRON
… compact profile that is compatible with mounting permanent magnets, which eliminate the need for bulky pulsed electromagnets or cryo-magnets and greatly enhance system efficiency. To this end, a variety of technologies were simulated and tested in experiment, the latter which required the design, …
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Design of a permanent magnet motor and a drive for cranking purposes
… increased the research of applications of permanent magnets for use in automobiles. However the application of permanent magnet machines for cranking purposes has not been investigated much. Difficult operating conditions, like, a maximum current density of 35A/mm², and the ability to …
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A methodology for evaluating and reducing rotor losses, heating, and operational limitations of high-speed flywheel batteries
… temperature of the composite materials and the permanent magnets which are often used in the motor-generator. In order to ensure the feasibility of a high-speed flywheel battery design it then becomes paramount to properly manage the total rotor losses as well as the heat removal strategy. This …
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