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Fully Levitated Rotor Magnetically Suspended by Two Pole-Pair Separated Conical MotorsKascak, Peter Eugene 27 July 2010 (has links)
No description available.
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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 MechanicalVictor, Valci Ferreira 05 November 2012 (has links)
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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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