Log in

Relevant bibliographies by topics / Permanent magnets / Dissertations / Theses

To see the other types of publications on this topic, follow the link: Permanent magnets.

Dissertations / Theses on the topic 'Permanent magnets'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 dissertations / theses for your research on the topic 'Permanent magnets.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse dissertations / theses on a wide variety of disciplines and organise your bibliography correctly.

1

DAMENTO, MICHAEL ANTHONY. "DETECTION OF MAGNETIZATION REVERSAL IN A NEODYMIUM-IRON-BORON MAGNET USING A HALL-EFFECT MICROPROBE." Diss., The University of Arizona, 1986. http://hdl.handle.net/10150/183945.

Full text

Abstract:

Magnetization processes in a sintered Nd-Fe-B permanent magnet (NEOMAX-35) were examined on a small scale using a Hall-effect microprobe with an active area 75 μm on a side. Probes were made by evaporating bismuth through a stencil mask onto glass slides. Experiments were performed by placing a probe onto the polished pole face of a Nd-Fe-B magnet and inserting the probe-magnet assembly into an electromagnet. Barkhausen steps, indicating rapid domain wall motion, were observed (superimposed upon the blank probe signal) in the demagnetization of a fully magnetized magnet. Magnetization traces f

APA, Harvard, Vancouver, ISO, and other styles

2

Lopez, Gomez Partida Fausto. "Design of a Permanent Magnet Synchronous Generator with Alnico Magnets." Thesis, Uppsala universitet, Elektricitetslära, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-395215.

Full text

Abstract:

Following the trends to diminish the fossil fuel energy production new technologies known for their renewable sources have become a signficant option for helping combat climate change and handle the current oil prices. These new technologies base their power production on already established physical principles that convert mechanical power to electrical power. Generators are the fundamental piece of machinery for electricity production. Among the various types of generators that exist, permanent magnet synchronous generators (PMSGs) are commonly used for renewable electricity production. At p

APA, Harvard, Vancouver, ISO, and other styles

3

Torreblanca, Humberto. "Multitube helicon source with permanent magnets." Diss., Restricted to subscribing institutions, 2008. http://proquest.umi.com/pqdweb?did=1563028441&sid=1&Fmt=2&clientId=1564&RQT=309&VName=PQD.

Full text

APA, Harvard, Vancouver, ISO, and other styles

4

CHO, HYOUNG JIN. "MICROMACHINED PERMANENT MAGNETS AND THEIR MEMS APPLICATIONS." University of Cincinnati / OhioLINK, 2002. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1014839747.

Full text

APA, Harvard, Vancouver, ISO, and other styles

5

Hilton, Geoffrey. "The analysis of magnetic drives using rare earth permanent magnets." Thesis, University of Sunderland, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.368123.

Full text

APA, Harvard, Vancouver, ISO, and other styles

6

Pollard, Robert James. "The microstructure and magnetic properties of NdFeB based permanent magnets." Thesis, University of Salford, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.328260.

Full text

APA, Harvard, Vancouver, ISO, and other styles

7

Tituana, Luis Rodrigo. "IMPLEMENTATION OF A PLANAR MAGNETIC MANIPULATOR WITH ROTATABLE PERMANENT MAGNETS." OpenSIUC, 2020. https://opensiuc.lib.siu.edu/theses/2664.

Full text

Abstract:

The development of new techniques for control of magnetic objects by external magnetic fields has been in constant improvement. These advancements range from the design and fabrication of magnetic nanoparticles to design and control of actuators that enable their manipulation. The ability to guide such magnetic objects at a distance without any direct mechanical contact is an attractive feature with great potential in medical applications. Magnetic fields are not distorted by their interaction with nonmagnetic materials, like those in the human body; and pose no harm to living tissues, which m

APA, Harvard, Vancouver, ISO, and other styles

8

Borghi, Chiara Caterina <1986&gt. "Continuous-Flow Magnetic Separation with Permanent Magnets for Water Treatment." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2014. http://amsdottorato.unibo.it/6233/1/Borghi_ChiaraCaterina_tesi.pdf.

Full text

Abstract:

More efficient water treatment technologies would decrease the water bodies’ pollution and the actual intake of water resource. The aim of this thesis is an in-depth analysis of the magnetic separation of pollutants from water by means of a continuous-flow magnetic filter subjected to a field gradient produced by permanent magnets. This technique has the potential to improve times and efficiencies of both urban wastewater treatment plants and drinking water treatment plants. It might also substitute industrial wastewater treatments. This technique combines a physico-chemical phase of adsorptio

APA, Harvard, Vancouver, ISO, and other styles

9

Borghi, Chiara Caterina <1986&gt. "Continuous-Flow Magnetic Separation with Permanent Magnets for Water Treatment." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2014. http://amsdottorato.unibo.it/6233/.

Full text

Abstract:

More efficient water treatment technologies would decrease the water bodies’ pollution and the actual intake of water resource. The aim of this thesis is an in-depth analysis of the magnetic separation of pollutants from water by means of a continuous-flow magnetic filter subjected to a field gradient produced by permanent magnets. This technique has the potential to improve times and efficiencies of both urban wastewater treatment plants and drinking water treatment plants. It might also substitute industrial wastewater treatments. This technique combines a physico-chemical phase of adsorptio

APA, Harvard, Vancouver, ISO, and other styles

10

Malloy, Adam. "Thermal management of the permanent magnets in a totally enclosed axial flux permanent magnet synchronous machine." Thesis, Imperial College London, 2014. http://hdl.handle.net/10044/1/25094.

Full text

Abstract:

Elevated magnet temperature in Axial Flux Permanent Magnet Synchronous Machines (AF PMSM) adversely affects torque production, material cost, and the risk of demagnetisation. These machines show promise in applications requiring high power density, however the factors which affect magnet temperature have rarely been investigated. This is therefore the focus of the thesis. A multiphysics numerical model was formulated which predicted the loss, flow, and temperature fields within an AF PMSM. A criterion for estimating the relative importance of the fluctuating component of a periodic heat source

APA, Harvard, Vancouver, ISO, and other styles

11

Thang. "Permanent magnets based on iron-platinum alloys." [S.l. : Amsterdam : s.n.] ; Universiteit van Amsterdam [Host], 2003. http://dare.uva.nl/document/69891.

Full text

APA, Harvard, Vancouver, ISO, and other styles

12

Matsumoto, Kenshi. "Crystal Structural Control of Nanomaterials toward High-Performance Permanent Magnets." Kyoto University, 2019. http://hdl.handle.net/2433/245309.

Full text

APA, Harvard, Vancouver, ISO, and other styles

13

De, Silvestri Federica. "Investigation of the magnetic levitation between HTS bulks and permanent magnets." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018.

Find full text

Abstract:

Lo scopo di questa ricerca è lo studio della levitazione magnetica risultante dall'interazione fra bulk di superconduttori ad alta temperatura critica e magneti permanenti. E' stato realizzato un modello numerico 2D in Comsol che simula l'interazione fra i due componenti, per studiare la forza di levitazione ottenuta. Il modello è stato successivamente validato con i risultati sperimentali ottenuti nei laboratori del dipartimento di Ingegneria dell'Energia Elettrica dell'Università di Bologna, ottenendo un buon riscontro sia per quanto riguarda i valori della forza sia per quanto riguarda le d

APA, Harvard, Vancouver, ISO, and other styles

14

Anocibar, Héctor Rolando. "Histerisímetro de Entreferro Variável HEV : uma proposta alternativa para a caracterização de ímãs permanentes." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2007. http://hdl.handle.net/10183/117449.

Full text

Abstract:

A determinação das principais propriedades magnéticas de um ímã permanente geralmente requer sistemas de medição sofisticados e custosos. Este trabalho analisa e propõe um sistema de caracterização de ímãs permanentes de Terras Raras à temperatura ambiente de baixo custo e de implementação mais simples e rápida. Ele consiste de um circuito magnético formado pelo ímã permanente sob caracterização, uma culatra de aço, um entreferro variável e uma sonda de efeito Hall com seu respectivo gaussímetro para a medição da intensidade do campo magnético no entreferro. Como introdução se apresenta o esta

APA, Harvard, Vancouver, ISO, and other styles

15

Amrani, Mustapha. "Development of small electrical machines utilising permanent magnets." Thesis, University of Manchester, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.329764.

Full text

APA, Harvard, Vancouver, ISO, and other styles

16

Lorenz, Amanda Leigh. "Improvement of NdFeB permanent magnets via diffusion annealing." Master's thesis, Universidade de Aveiro, 2012. http://hdl.handle.net/10773/10142.

Full text

Abstract:

Mestrado em Ciência e Engenharia de Materiais<br>Os magnetos sinterizados de Nd-Fe-B, têm o maior produto de energia de todos os magnetos e têm vindo a substituir progressivamente os magnetos ferróicos em aplicações onde é necessária uma maior densidade de energia. São áreas como carros híbridos, acionamento de turbinas eólicas, bobines de motores, e também na miniaturização de dispositivos eletrónicos. Um parâmetro importante é a sua coercividade, e respetiva dependência na temperatura, que determina o intervalo de temperatura de aplicação. A fim de melhorar as temperaturas de funcionamento,

APA, Harvard, Vancouver, ISO, and other styles

17

Anocibar, Héctor Rolando. "Alternativa para caracterização de ímãs permanentes com destacada anisotropia magnetocristalina sem desmagnetização irreversível." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2011. http://hdl.handle.net/10183/34745.

Full text

Abstract:

A determinação das principais propriedades magnéticas de um ímã permanente geralmente requer sistemas de medição sofisticados e custosos. Este trabalho analisa e propõe um sistema de caracterização de ímãs permanentes de Terras Raras e Cerâmicos à temperatura ambiente de baixo custo e de implementação mais simples. Para isso, o Histerisímetro de Entreferro Variável, HEV, é concebido e estudado. Ele consiste de um circuito magnético formado pelo ímã permanente sob caracterização, uma culatra de aço, um entreferro variável, bobinas de magnetização e desmagnetização de baixa potência, uma sonda d

APA, Harvard, Vancouver, ISO, and other styles

18

Gangla, Vineeta. "Analytical methods for electromechanical forces and torque computation in brushless permanent magnet machines." Thesis, This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-12052009-020038/.

Full text

APA, Harvard, Vancouver, ISO, and other styles

19

Chen, Hansheng. "Correlating the microstructure, magnetic domain structure, and magnetic properties of rare earth permanent magnets." Thesis, The University of Sydney, 2018. http://hdl.handle.net/2123/18996.

Full text

Abstract:

Rare earth permanent magnets have been broadly integrated into various applications, such as advanced electric motor technologies which partly relieve the current energy crisis worldwide by taking advantages of their extraordinary magnetic properties. Traditional approaches for increasing the intrinsic coercivity (Hci) of rare earth permanent magnets typically come at the expense of remanence, resulting in a reduction of maximum magnetic energy product [(BH)max]. Therefore, novel design and processing strategies are in urgent need to circumvent this trade-off in the advanced rare earth permane

APA, Harvard, Vancouver, ISO, and other styles

20

Dudáš, Juraj. "Návrh synchronního motoru s vnějším rotorem a s permanentními magnety." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2015. http://www.nusl.cz/ntk/nusl-221153.

Full text

Abstract:

The diplomatic thesis will describe the principle functions of synchronous motors with permanent magnets, for therein analysis of PMSM and BLDC motors. We will make calculation of the required parameters from the power unit for glider Discus 2. We will create a design of BLDC and PMSM motor from specified parameters. Features of the proposed engines will be verified with the help of the programs FEMM, RMxprt, Maxwell. At the end of the work will make conclusion about the diplamatic project and diffrences between PMSM and BLDC motor.

APA, Harvard, Vancouver, ISO, and other styles

21

Bollero, Real Alberto. "Isotropic nanocrystalline (Nd,Pr)(Fe,Co)B permanent magnets." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2003. http://nbn-resolving.de/urn:nbn:de:swb:14-1069758225796-19366.

Full text

Abstract:

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 Mikrostruktur und magnetischen Eigenschaften von isotropen nanokristallinen (Nd,Pr)(Fe,Co)B-Permanentmagneten. Hochkoerzitive Magnete vom Typ (Nd,Pr)FeB wurden durch hochenergetisches Mahlen in der Kugelmühle oder Rascherstarrung hergestellt. Der Einfluss geringer Mengen von Zusätzen wie Dy und Zr und di

APA, Harvard, Vancouver, ISO, and other styles

22

Jubb, Gary Anthony. "Production and properties of neodymium-iron-boron permanent magnets." Thesis, University of Bradford, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.236470.

Full text

APA, Harvard, Vancouver, ISO, and other styles

23

Kottenstette, Nicholas E. (Nicholas Eugene). "Designing mechanisms with shape memory alloys and permanent magnets." Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/43923.

Full text

APA, Harvard, Vancouver, ISO, and other styles

24

Anagnostopoulou, Evangelia. "A new route for rare-earth free permanent magnets : synthesis, structural and magnetic characterizations of dense assemblies of anisotropic nanoparticles." Thesis, Toulouse, INSA, 2016. http://www.theses.fr/2016ISAT0045/document.

Full text

Abstract:

Cette thèse a eu pour objectif la préparation d’aimants nanostructurés sains terres rares à base d’un assemblage dense de nanobâtonnets de cobalt (Co NBs). Nous avons démontré la faisabilité d’un changement d’échelle du procédé polyol, avec des conditions d’agitation contrôlées, pour obtenir 5 g de NBs monodisperse. La modification de l’agent nucléant nous a permis de contrôler la taille et la forme des NBs conduisant à des valeurs élevées de champ coercitif. La réalisation d’aimants macroscopiques denses et robustes a été possible via la dispersion des bâtonnets dans du chloroforme et son éva

APA, Harvard, Vancouver, ISO, and other styles

25

FARIA, JUNIOR RUBENS N. de. "The Structures and properties of Pr/Nd-Fe-B-(Cu) permanent magnets and alloys." reponame:Repositório Institucional do IPEN, 1993. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10359.

Full text

Abstract:

Made available in DSpace on 2014-10-09T12:37:45Z (GMT). No. of bitstreams: 0<br>Made available in DSpace on 2014-10-09T13:55:58Z (GMT). No. of bitstreams: 1 04760.pdf: 5699610 bytes, checksum: c39af246787ef81d5c48ece3cf888efc (MD5)<br>Thesis (Ph.D)<br>IPEN/T<br>University of Birmingham, Birmingham, England

APA, Harvard, Vancouver, ISO, and other styles

26

Stangel, Anders. "Magnetocrystalline Anisotropy in(FexNi1-x)2B Materials." Thesis, Uppsala universitet, Materialteori, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-301992.

Full text

Abstract:

The magnetic properties of the (FexNi1-x)2B family of materials are explored using DFT calculations utilizing the FPLO and SPR-KKR code packages. It is found that a uniaxial magnetocrystalline anisotropy exists at around x = 0.8 with a magnetocrystalline anisotropy energy at around 0.3 MJ/m^3. A calculation of the lattice constant for these materials were attempted but failed due to the emergence of local minima and the calculations of magnetic properties were instead done using lattice parameters interpolated between known experimental values.

APA, Harvard, Vancouver, ISO, and other styles

27

Lwin, Mark. "The dynamic compaction of the metastable hard magnet powder Sm!b2!sFe!b17!sNx to form bulk magnets." Thesis, Queensland University of Technology, 1994.

Find full text

APA, Harvard, Vancouver, ISO, and other styles

28

Edström, Alexander. "Theoretical Magnet Design : From the electronic structure of solid matter to new permanent magnets." Licentiate thesis, Uppsala universitet, Materialteori, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-231810.

Full text

Abstract:

A good permanent magnet should possess a large saturation magnetisation (Ms), large mag- netocrystalline anisotropy energy (MAE) and a high Curie temperature (TC). A difficult but important challenge to overcome for a sustainable permanent magnet industry is to find novel magnetic materials, exhibiting a large MAE, without the use of scarcely available elements such as rare-earth metals. The purpose of this thesis is to apply computational methods, including density functional theory and Monte Carlo simulations, to assess the three above mentioned permanent magnet properties and in particular

APA, Harvard, Vancouver, ISO, and other styles

29

Manakshya, Nikhil. "Permanent magnet synchronous machine using ferrite vs rare earth magnets : how do they compare?" Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-302658.

Full text

Abstract:

Permanent magnet synchronous machines (PMSM are considered as viable options for automotive and traction applications. Rare earth magnets such as Neodymium Iron Boron (NdFeB is the most common choice in the PMSM for electric vehicles to achieve high power density machines. However, rare earth magnets are problematic from ethical and sustainability perspectives. From these perspectives, there are better magnet alternatives, such as ferrites. Ferrite magnets are well known for lower environmental impact, abundance and low cost. Due to a lower residual flux density of a ferrite magnet than that o

APA, Harvard, Vancouver, ISO, and other styles

30

Judge, Andy. "Air Gap Elimination in Permanent Magnet Machines." Digital WPI, 2011. https://digitalcommons.wpi.edu/etd-dissertations/123.

Full text

Abstract:

In traditional Permanent Magnet Machines, such as electric motors and generators, power is transmitted by magnetic flux passing through an air gap, which has a very low magnetic permeability, limiting performance. However, reducing the air gap through traditional means carries risks in manufacturing, with tight tolerances and associated costs, and reliability, with thermal and dynamic effects requiring adequate clearance. Using a magnetically permeable, high dielectric strength material has the potential to improve magnetic performance, while at the same time offering performance advantages

APA, Harvard, Vancouver, ISO, and other styles

31

Conkey, Andrew P. "Vibration sensors utilizing fiber fabry-perot interferometers and permanent magnets." Thesis, [College Station, Tex. : Texas A&M University, 2007. http://hdl.handle.net/1969.1/ETD-TAMU-1541.

Full text

APA, Harvard, Vancouver, ISO, and other styles

32

Sjökvist, Stefan. "Demagnetization Studies on Permanent Magnets : Comparing FEM Simulations with Experiments." Licentiate thesis, Uppsala universitet, Elektricitetslära, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-236301.

Full text

Abstract:

In a world where money often is the main controlling factor, everything that can be tends to be more and more optimized. Regarding electrical machines, developers have always had the goal to make them better. The latest trend is to make machines as efficient as possible, which calls for accurate simulation models where different designs can be tested and evaluated. The finite element method is probably the most popular approach since it makes it possible to, in an easy and accurate way, get numerical solutions to a variety of physics problems with complex geometries and non-linear materials. T

APA, Harvard, Vancouver, ISO, and other styles

33

Lixandru, A. "Recycling of Nd-Fe-B permanent magnets by hydrogen processes." Phd thesis, Technische Universität Darmstadt, 2018. https://tuprints.ulb.tu-darmstadt.de/7392/1/10.%20Dissertation%20Lixandru%20-%20lite-3.pdf.

Full text

Abstract:

This thesis is based on the work carried out since January 2014 as a Ph.D. student in the Functional Materials department at Technische Universität Darmstadt. In the first part of my thesis, different waste streams of electrical and electronic equipment from an industrial recycling plant were analyzed in order to localize, identify and collect rare-earth permanent magnets of Nd-Fe-B type. This particular type of magnets were mainly found in hard disk drives from laptops and desktop computers, as well as in loudspeakers from compact products such as flat screen TVs, PC screens, and laptops. The

APA, Harvard, Vancouver, ISO, and other styles

34

Samin, Adib J. Jr. "An analysis of neutron radiation effects on NdFeB permanent magnets." The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1405899609.

Full text

APA, Harvard, Vancouver, ISO, and other styles

35

Neto, Teofilo Mendes. "Estudo microestrutural e propriedades magnéticas em ímãs permanentes sinterizados a base de PrFeCoBNb com adições de elementos de ligas." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/85/85134/tde-28092011-094845/.

Full text

Abstract:

Neste estudo, as propriedades magnéticas dos ímãs sinterizados, produzidos a partir de uma mistura de ligas Pr16Fe76B8 e Pr14FebalCo16B6Nb0,1Mx, onde M= Al, Cu, P, Si, Gd, Ga, Dy, Tb e x= 0,1, 0,3, 0,5 % at. em iguais proporções, foram correlacionadas com as características microestruturais através de microscopia eletrônica de varredura (MEV) e de transmissão (MET). Utilizou-se microscopia eletrônica de varredura (MEV) e processamento computacional das micrografias, na investigação das características associadas ao tamanho e formato dos grãos magnéticos (Φ). A correlação utilizada indicou

APA, Harvard, Vancouver, ISO, and other styles

36

Harrison, Simon Andrew. "Characterisation of the mechanisms of magnetisation change in permanent magnet materials through the interpretation of hysteresis measurements." University of Western Australia. School of Physics, 2004. http://theses.library.uwa.edu.au/adt-WU2004.0048.

Full text

Abstract:

The mechanisms by which magnetisation changes occur in magnetic materials may be investigated by a variety of hysteresis measurements. During this study both alternating and rotational hysteresis measurements were used to characterise the mechanisms of magnetisation change in a number of permanent magnet materials. Studies of the time dependence of magnetisation, remanent magnetisations and the dependence of the reversible magnetisation on the irreversible magnetisation were undertaken. These studies revealed that in sintered rare-earth iron magnets the magnetisation change is predominately co

APA, Harvard, Vancouver, ISO, and other styles

37

Riahi, Nayereh. "Design, Optimization, And Feedback Control Of A Planar Noncontact Magnetic Manipulator With Rotatable Permanent Magnets." OpenSIUC, 2021. https://opensiuc.lib.siu.edu/dissertations/1940.

Full text

Abstract:

This dissertation addresses different aspects of employing permanent magnets in the structure of noncontact magnetic manipulators. These systems employ controllable arrays of magnets to generate proper magnetic fields within their operation region and steer magnetic objects remotely without mechanical contact. This noncontact feature makes magnetic manipulators of particular interest in medical applications. They allow physicians to drive magnetic objects in closed and hard-to-reach environments including the human body for non- or minimally invasive diagnostic and therapeutic applications. As

APA, Harvard, Vancouver, ISO, and other styles

38

Emura, Marilia. "Propriedades Magnéticas de Ímãs Aglomerados e Nanocristalinos." Universidade de São Paulo, 1999. http://www.teses.usp.br/teses/disponiveis/43/43133/tde-09102012-145903/.

Full text

Abstract:

Imãs são corpos de materiais magnetizáveis utilizados para gerar um forte campo magnético em sua vizinhança. Essa característica faz com que sejam empregados em diversas aplicações na vida moderna, tais como motores para a indústria eletroeletrônica e automobilística, como elementos de fixação e em acoplamentos magnéticos na indústria mecânica. O mercado de ímãs permanentes movimenta atualmente cerca de US$ 5 bilhões por ano e está em plena expansão, sendo estimado um crescimento de 12% por ano até o final desta década de 90. Tal crescimento é atribuído aos \"novos materiais\" desenvolvidos a

APA, Harvard, Vancouver, ISO, and other styles

39

Fliegans, Jérôme. "Coercivity of NdFeB-based sintered permanent magnets : experimental and numerical approaches." Thesis, Université Grenoble Alpes (ComUE), 2019. http://www.theses.fr/2019GREAY071.

Full text

Abstract:

Les aimants permanents Nd-Fe-B sont actuellement les plus puissants du marché. Ils sont indispensables pour des applications telles que les moteurs des véhicules électriques ou les générateurs des éoliennes. Leurs propriétés exceptionnelles viennent des propriétés magnétiques intrinsèques de la phase Nd2Fe14B et de leur microstructure. Cependant, les machines électriques fonctionnent entre 120 et 180°C et les propriétés magnétiques extrinsèques telles que la coercitivité et la rémanence diminuent avec la température. Un moyen d’améliorer la coercitivité des aimants frittés Nd-Fe-B est la subst

APA, Harvard, Vancouver, ISO, and other styles

40

Chaaban, Farid B. "Computer aided analysis, modelling and experimental assessment of permanent magnet synchronous machines with rare earth magnets." Thesis, University of Liverpool, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.293710.

Full text

APA, Harvard, Vancouver, ISO, and other styles

41

Liu, Zhejie. "Investigation of coupled thermo-electromagnetic problems in relation to applications of permanent magnets to electromagnetic devices." Thesis, University of Liverpool, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.239956.

Full text

APA, Harvard, Vancouver, ISO, and other styles

42

Corfield, Martin Richard. "Production of sintered permanent magnets based on (Nd/Pr)Fe-B alloys." Thesis, University of Birmingham, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.410302.

Full text

APA, Harvard, Vancouver, ISO, and other styles

43

Zheng, Mei. "Novel stator wound field synchronous machines with permanent magnets on slot openings." Thesis, University of Sheffield, 2018. http://etheses.whiterose.ac.uk/19976/.

Full text

APA, Harvard, Vancouver, ISO, and other styles

44

Fazil, Sadia. "Simulation of stray radiation and demagnetization of permanent magnets in EXFEL undulators." Thesis, Stockholms universitet, Fysikum, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-193335.

Full text

APA, Harvard, Vancouver, ISO, and other styles

45

Patel, Anup. "Pulsed field magnetization of composite superconducting bulks for magnetic bearing applications." Thesis, University of Cambridge, 2013. https://www.repository.cam.ac.uk/handle/1810/256579.

Full text

Abstract:

Permanent magnets are essential components for many devices such as motors, which currently account for 45 % of global electricity consumption, generators and also superconducting magnetic bearings used for applications such as flywheel energy storage. But even the most powerful rare-earth magnets are limited to a remanent field of 1.4 T, whereas superconducting materials such as YBCO in their bulk form have the extraordinary ability to trap magnetic fields an order of magnitude higher, whilst being very compact. This gives them the potential to increase efficiency and allow significant volume

APA, Harvard, Vancouver, ISO, and other styles

46

Xu, Yan 1963 Jan 31. "Effect of quench rate on the coercivity of Nd-Fe-B permanent magnets." Thesis, McGill University, 1989. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=55669.

Full text

APA, Harvard, Vancouver, ISO, and other styles

47

Ortega, Dulanto Adrian. "Design of a Synchronous Reluctance Motor Assisted with Permanent Magnets for Pump Applications." Thesis, KTH, Elektrisk energiomvandling, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-163280.

Full text

Abstract:

This Master thesis focuses on the design of a high efficiency Permanent-Magnet-Assisted Synchronous Reluctance Motor (PMASynRM) intended for pump applications. The new motor is designed to replace an existing Induction Motor (IM) in a pump product. The basic principles of SynRM, and PMASynRM Motors and a good analytical model were introduced. Due to the complexity and high non-linearity of this specific electrical machine, Finite Element Method (FEM) and an analytical model were combined. First, a parameter sensitivity analysis was carried out with the software SPEED. However, SPEED does not g

APA, Harvard, Vancouver, ISO, and other styles

48

Attanasio, Steven A. 1967. "Corrosion and environmentally-assisted cracking of rapidly solidified neodymium-iron-boron permanent magnets." Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/39748.

Full text

Abstract:

Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1996.<br>Vita.<br>Includes bibliographical references (p. 383-388).<br>by Steven A. Attanasio.<br>Ph.D.

APA, Harvard, Vancouver, ISO, and other styles

49

Patel, Hardik D. "Use of Permanent Magnets to Improve the Seismic Behavior of Light-Framed Structures." Thesis, Virginia Tech, 2005. http://hdl.handle.net/10919/42707.

Full text

Abstract:

Light-framed wood structures generally have satisfied the life safety objective of the current seismic design approach. The main source of energy dissipation in such structures is the inelastic behavior of the connectors connecting framing and sheathing elements. Wood framed structures when subjected to strong ground excitations experience structural and non-structural damage which may incur large repair/replacement costs or may even render the structure out of service. Thus, it is very important to apply techniques to mitigate the seismic response of the light-framed structures and avoid larg

APA, Harvard, Vancouver, ISO, and other styles

50

Zhu, Li. "A distributed modular self-reconfiguring robotic platform based on simplified electro-permanent magnets." Thesis, Toulouse 3, 2018. http://www.theses.fr/2018TOU30060.

Full text

Abstract:

Un système robotique distribué et reconfigurable (MSRR) est composé de plusieurs modules ayant certaines fonctions de mouvement, de perception et d'action. Ils peuvent s'adapter à l'environnement et aux objectifs en se connectant et en se déconnectant pour obtenir la configuration et la forme désirées. Les MSRR contiennent souvent deux systèmes : l'un constitué d'actionneurs pour le mouvement, l'autre pour la connexion. A l'heure actuelle, de nombreuses institutions travaillent sur les MSRR ; la conception, la miniaturisation, l'économie d'énergie, les algorithmes de contrôle ont fait l'objet

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!