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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.
1

Estudo e constru??o de um motor de indu??o de rotor externo de pequeno porte utilizado como motor-mancal / Study and construction of an external rotor induction motor small size used as bearingless motor

Barros Filho, Adjair Ferreira 09 October 2017 (has links)
Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2017-12-12T18:05:10Z No. of bitstreams: 1 AdjairFerreiraBarrosFilho_TESE.pdf: 9926886 bytes, checksum: 1d2dea348ca690f1fa1fc74730374929 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2017-12-13T19:41:36Z (GMT) No. of bitstreams: 1 AdjairFerreiraBarrosFilho_TESE.pdf: 9926886 bytes, checksum: 1d2dea348ca690f1fa1fc74730374929 (MD5) / Made available in DSpace on 2017-12-13T19:41:36Z (GMT). No. of bitstreams: 1 AdjairFerreiraBarrosFilho_TESE.pdf: 9926886 bytes, checksum: 1d2dea348ca690f1fa1fc74730374929 (MD5) Previous issue date: 2017-10-09 / Esta tese tem como objetivo o estudo e a constru??o de um prot?tipo de motor de indu??o trif?sico de pequenas dimens?es (28,6 mm de di?metro externo e 15 mm de altura), com o rotor externo do tipo gaiola de esquilo sendo utilizado como motor-mancal. Esse estudo iniciou utilizando um motor Brushless convencional e que foi adaptado para funcionar como motor de indu??o com rotor externo. O motor de indu??o sem mancais utiliza a configura??o de bobinado dividido para conseguir o posicionamento radial. Foram realizados estudos de simula??es utilizando o M?todo dos Elementos Finitos ? FEM mostrando efetivamente que ? poss?vel controlar a posi??o radial para manter o rotor girando. Foi constru?do e testado um primeiro prot?tipo com sucesso, para uma pot?ncia de 100 W mostrando um bom potencial para aplica??es nesta faixa de pot?ncia e tamanho, como os aplicados em sistemas de cora??o artificial. O sistema de controle foi implementado utilizando o Processador Digital de Sinais ? DSP TMS 320F28335. / This thesis aims the study and construction of a prototype of a small three-phase induction motor (28.6 mm outside diameter and 15 mm height), with the external squirrel cage-type rotor being used as a Bearingless motor. This study started using a conventional Brushless motor and was adapted to function as an external rotor induction motor. The bearingless induction motor uses the split winding configuration to achieve radial positioning. Simulation studies were performed by using the Finite Element Method (FEM), effectively showing that it is possible to control the radial position to keep the rotor spinning. A first prototype was successfully built and tested for a power of 100 W showing good potential for applications in this power range and size, such as those applied in artificial heart systems. The control system was implemented using the Digital Signal Processor - DSP TMS 320F28335.
2

Controle das potências do aerogerador de indução com rotor bobinado com emprego de lógica fuzzy durante afundamentos de tensão

Osório, Carlos Mario Rocha January 2015 (has links)
Orientador: Prof. Dr. Alfeu Joãozinho Sguarezi Filho / Dissertação (mestrado) - Universidade Federal do ABC, Programa de Pós-Graduação em Engenharia Elétrica, 2015. / This research project presents the active and reactive power control of the Doubly Fed Induction Generator (DFIG) employing fuzzy logic for a wind power generation system, the proposed controller is a Fuzzy Logic Controller Takagi Sugeno type (TS FLC) which determines the rotor voltage by the rules base dened by a linear combination of the membership sets of the rotor current error, that reduces the complexity of the structure and consequently a lower computational cost and its easy to implement on a experimental set compared to other controllers such as Fuzzy Mamdani type. System control is accomplished using Stator Flux Field Oriented Control with Space Vector Modulation and computer simulation using mathematical models implemented in Matlab/Simulink. The results indicates that the FLC TS could be an interesting alternative to conventional controllers in the power control of the DFIG during normal operation conditions and under balanced voltage sags conditions.
3

Controle direto de torque aplicado em aerogeradores que empregam o gerador de indução com rotor bobinado

Tabares, Harrison García January 2014 (has links)
Orientador: Dr. Alfeu J. Sguarezi Filho / Dissertação (mestrado) - Universidade Federal do ABC, Programa de Pós-Graduação em Engenharia Elétrica, 2014. / Devido as preocupações com a redu¸c¿ao do uso dos recursos f'osseis e das emiss¿oes de CO2 ocasionadas pelos mesmos, o interesse no uso de energias renov 'aveis aumentou, sendo uma destas fontes a energia e'olica. O Gerador de Indu¸c¿ao de Rotor Bobinado (GIRB) tem demonstrado ser uma ferramenta capaz de otimizar o uso da energia e'olica, dada a sua alta efici¿encia, rentabilidade e robustez mec¿anica, ainda assim 'e necess'ario superar os numerosos desafios que est¿ao presentes nesta tecnologia, tais como qualidade da pot¿encia, estabilidade da rede, entre outros. O objetivo desta pesquisa se concentra no estudo de t'ecnicas de controle de pot¿encia fornecida pelo GIRB aplicado a sistemas de gera¸c¿ao e'olica. No presente caso, o sistema de gera¸c¿ao 'e composto por um GIRB com seu estator conectado diretamente 'a rede e seu rotor 'e conectado 'a rede atrav'es de um conversor bidirecional. Prop¿oe-se estudar o m'etodo de controle direto de torque (CDT) com emprego de controladores PI e por modos deslizantes (SMC) mais PI. O controle direto de torque 'e uma t'ecnica de alto desempenho din¿amico e possibilita o controle independente do torque e fluxo do gerador o que possibilitar'a o controle das pot¿encias ativa e reativa do GIRB. Da mesma forma, 'e estudado o conversor para o processamento da energia gerada. As simula¸c¿oes baseadas em modelos matem'aticos destes m'etodos de controle foram revistos, analisados e comparados com as simula¸c¿oes de textos de refer¿encia. Resultados experimentais obtidos em uma bancada validaram o prot'otipo proposto. / Due to concerns about reducing the use of fossil resources and the CO2 emissions caused by them, interest in the use of renewable energy increased, one of these sources is wind energy. The Wound Rotor Induction Generator (WRIG) has been proved to be a tool to optimize the use of wind energy, given its high efficiency, profitability and mechanical robustness, it is still necessary to overcome the many challenges that are present in this technology, such as power quality, grid stability, among others. This research focuses on the study of control techniques for power supply by WRIG applied to wind generation systems. In this case, the generation system consists of a stator WRIG is connected directly to the electrical network and its rotor too, but via a bidirectional converter. It is proposed to study the method of direct torque control (DTC) with the use of PI and sliding mode controllers (SMC) more PI. The direct torque control is a technique of high dynamic performance and enables independent control of torque and flux generator, which will enable the control of active and reactive power ofWRIG. Likewise, it is studied the converter for processing the generated power. The simulations based on mathematical models of these control methods were reviewed , analyzed and compared with simulations of reference texts . Experimental results obtained on a bench validated the proposed prototype.

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