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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
11

Fully Levitated Rotor Magnetically Suspended by Two Pole-Pair Separated Conical Motors

Kascak, Peter Eugene 27 July 2010 (has links)
No description available.
12

Viabilidade da Utiliza??o de M?quinas de Indu??o Convencionais como Motores sem Mancais Mec?nicos / Viability of the Using Machines Induction Motors Without Bearings as Conventional Mechanical

Victor, Valci Ferreira 05 November 2012 (has links)
Made available in DSpace on 2014-12-17T14:56:08Z (GMT). No. of bitstreams: 1 ValciFV_TESE.pdf: 3670403 bytes, checksum: d8b060478983488207d8885853eac60d (MD5) Previous issue date: 2012-11-05 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / Electrical Motors transform electrical energy into mechanic energy in a relatively easy way. In some specific applications, there is a need for electrical motors to function with noncontaminated fluids, in high speed systems, under inhospitable conditions, or yet, in local of difficult access and considerable depth. In these cases, the motors with mechanical bearings are not adequate as their wear give rise to maintenance. A possible solution for these problems stems from two different alternatives: motors with magnetic bearings, that increase the length of the machine (not convenient), and the bearingless motors that aggregate compactness. Induction motors have been used more and more in research, as they confer more robustness to bearingless motors compared to other types of machines building with others motors. The research that has already been carried out with bearingless induction motors utilized prototypes that had their structures of stator/rotor modified, that differ most of the times from the conventional induction motors. The goal of this work is to study the viability of the use of conventional induction Motors for the beringless motors applications, pointing out the types of Motors of this category that can be more useful. The study uses the Finite Elements Method (FEM). As a means of validation, a conventional induction motor with squirrel-cage rotor was successfully used for the beringless motor application of the divided winding type, confirming the proposed thesis. The controlling system was implemented in a Digital Signal Processor (DSP) / Motores el?tricos transformam energia el?trica em energia mec?nica com relativa facilidade. Em algumas aplica??es particulares, necessita-se de motores el?tricos para trabalhar com flu?dos sem contamina??o, em regime de altas velocidades, em condi??es in?spitas, ou, ainda, em locais de dif?cil acesso e ? profundidade bastante consider?vel. Nestes casos, os motores com mancais mec?nicos, cujo desgaste ocasiona a necessidade de manuten??es, n?o s?o adequados. Uma solu??o poss?vel para este problema adv?m de duas alternativas: motores com mancais magn?ticos, que t?m o inconveniente de aumentar o comprimento da m?quina, e motores-mancais, que agregam compacidade. Motores de indu??o t?m sido cada vez mais utilizados em pesquisas, pois conferem maior robustez aos motores-mancais comparados a esses tipos de m?quinas constru?das com outros motores. As pesquisas j? realizadas com motores-mancais de indu??o utilizaram prot?tipos, cujas estruturas do estator e/ou rotor foram modificadas, diferindo em grande parte dos motores de indu??o convencionais. ? objetivo deste trabalho, estudar a viabilidade do uso dos motores de indu??o convencionais para a aplica??o de motores-mancais, apontando os tipos de motores dessa categoria que mais se ad?quam. O estudo utiliza o M?todo dos Elementos Finitos FEM. Como comprova??o, um motor de indu??o convencional com rotor gaiola de esquilo foi utilizado com sucesso para a aplica??o de motor-mancal do tipo enrolamento dividido, ratificando a tese proposta. O sistema de controle foi implementado em um Processador Digital de Sinais DSP

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