Field Oriented Control
Mostrando 1-12 de 26 artigos, teses e dissertações.
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1. Construção de células solares sensibilizadas por corante a partir de nanoestruturas de ZnO obtidas por método hidrotermal / Construction of dye-sensitized solar cells from Nanostructures ZnO obtained by Method Hidroterma
The Photovoltaic (PV) sector has been facing an accelerated development rate within the last decade, which is comparable to the other renewable energy sources, according to the data released by the International Energy Agency (IEA). Therefore, a myriad of R&D activities and technological innovations are under way in order to cut down the manufacturing cost o
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 01/08/2011
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2. Robustness of global asymptotic stability in indirect field-oriented control of induction motors
The influence of the rotor time constant mismatch on the global stability of induction motors under indirect field oriented control (IFOC) is analyzed. A test for global stability is provided, based on necessary and sufficient conditions for the existence of quadratic Lyapunov functions for IFOC drives. This test yields robustness margins with respect to rot
Publicado em: 2011
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3. Robustness margins for indirect field-oriented control of induction motors
The influence of the rotor time constant mismatch on the stability of induction motors under indirect field-oriented control is analyzed. The results of [14] are generalized. A Lyapunov function which provides a global stability test and allows us to compute robustness margins is given. Different mechanisms for the loss of stability are detected by means of
Publicado em: 2011
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4. O inconsciente na prática pedagógica
This research aims to investigate the role of the unconscious on the pedagogical praxis, starting from the relationship between education and psychoanalysis. The delineated theoretical route begins on the analysis of the hegemonic psychopedagogical discourse which has been based on the belief that the teacher could ensure the control of his/her action and th
Publicado em: 2009
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5. Desenvolvimento moral e práticas pedagógicas na educação infantil : um estudo sociocultural construtivista
Moral development has increasingly become an important research field within Developmental Psychology. This concern has emerged to meet the needs of a scientific perspective towards understanding human beings development from a holistic perspective, taking into account the participation of the educational system in such process. Social changes and its conseq
Publicado em: 2009
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6. A luz alem da visão : iluminação e sua relação com a saude e bem-estar de funcionarias de lojas de rua e de shopping centers em Porto Alegre / The light beyond vision : lighting and its relationship with health and well-being of employees at street and shopping mall retail stores in Porto Alegre
This work addresses the issue of non-visual impacts of human exposure to light, in an attempt to relate the quality of lighting to health, comfort, and well-being of female retail store employees. The sample for the cross-sectional study was randomly established with female volunteers. Three groups were selected: street retail stores with outside contact and
Publicado em: 2009
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7. Vector control of a single-phase induction motor / Controle vetorial do motor de indução monofásico
The objective of this work is to study the rotor flux vector control applied to a single-phase induction motor drive. Initially, a mathematical model of the motor will be derived. The motor equations will be transformed to the stationary reference frame so that the angular dependency due to the asymmetry of the motor variables is eliminated. Then is discusse
Publicado em: 2008
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8. Controle do fluxo de potencia do gerador de indução duplamente alimentado funcionando na velocidade subsincrona / Power flux control of doubly fed induction generator operating at sub-synchronous speeds
Esta tese trata da implementação do controle do fluxo de potência de um gerador de indução duplamente alimentado conectado ao barramento infinito. A orientação de fluxo do estator é utilizada, pois permite o controle, de forma independente, das potências ativa e reativa do estator, por meio das componentes de eixo direto e em quadratura da corrente
Publicado em: 2008
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9. Coalições de advocacia na formulação da política nacional de biodiversidade e florestas
Within the scope of studying the national environmental policy, this dissertation of master studies analyses the dynamic of the subsystem of the biodiversity and forest policy in the period 1992-2006. The intention is to comprehend the logic of action of the main governmental and non-governmental actors that form this policy subsystem and also the gradual ch
Publicado em: 2008
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10. Implementação de controle vetorial em gerador assíncrono
Esta Dissertação aborda a implementação do Controle Vetorial de um Gerador de Indução Duplamente Alimentado (DFIG) com aplicação em Sistemas Eólicos de operação em Velocidade Variável. Cada etapa do processo de transferir a estratégia de controle, desenvolvida em simulação, para o microcontrolador é discutida, destacando-se sua importância c
Publicado em: 2007
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11. A Vida entre discursos: representações da sexualidade do/a adolescente por profissionais de saude em uma unidade de atenção básica.
In the present day, populational growth and the AIDS epidemic have restored health to a position of power for the prescribing of conducts to diverse groups, among them the adolescents. Adolescents represent a segment of the population that has recently been acknowledged as having rights, and that currently seeks for ways to go about the meanings and the cont
Publicado em: 2006
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12. Vaccinal situation and exposure to biological material: the role of higher educational institutions in the background of graduating students in the health area in the state of Goiás. / Situação vacinal e exposição a material biológico: o papel das instituições de ensino superior na formação de graduandos na área de saúde no estado de Goiás
This is a descriptive study carried out in Higher Education Institutions (HEI) at the State of Goiás Andergraduating students from the last term/grade of courses in the health field took part in this study We aimed at characterizing the exposure to biohazards among andergraduating students from courses in the health area within the State of Goiás; identify
Publicado em: 2005