Buscar
Itens para a visualização no momento 1-10 of 81
Motor ultra-sônico linear com geometria tubular
(Universidade Federal de Santa Maria, 2008-05-07)
This work presents the study on a linear ultrasonic motor with tubular geometry for linear displacements. Similar topologies, reported elsewhere, are conceived for producing rotary motions. Due to some particular characteristics ...
Avaliação da segurança da operação de sistemas elétricos de potência considerando os limites de estabilidade angular e de tensão
(Universidade Federal de Santa Maria, 2008-02-22)
This work presents new analytical and computational methods for operation security assessment of electric power systems by considering Angle and Voltage Stability Limits. In the context of Angle Stability, it was developed ...
Inversores ZCZVT com acoplamento magnético: síntese e análise
(Universidade Federal de Santa Maria, 2008-03-10)
This Ph. D. Thesis presents a in deep study of the mechanism of resonant transition soft-switching techniques. By means of the principles that rules the PWM resonant transition converters, a novel tool for analysis and ...
Utilização avançada da capacidade excedente de sistemas de transmissão CCAT para produção de oxigênio e hidrogênio
(Universidade Federal de Santa Maria, 2008-04-02)
This PhD thesis discusses the use of the power plant capacity in HVDC transmission systems during inactive periods of the main converters to feed local loads, aiming at a better AC power quality and DC transmission. The ...
Projeto e implementação de lâmpadas para iluminação de interiores empregando diodos emissores de luz(LEDS)
(Universidade Federal de Santa Maria, 2008-10-31)
This work presents an efficient lighting system using high intensity light emitting
diodes (LEDs). The goal is to develop a compact and low cost electronic circuit to drive and
control the current of LEDs disposed in a ...
Análise e implementação de um circuito de auxílio à comutação integrado aplicado a uma fonte ininterrupta de energia
(Universidade Federal de Santa Maria, 2008-04-14)
This study proposes an auxiliary commutation circuit, applied to a double-conversion uninterruptible power supply, operating with a three-level PWM full-bridge inverter. In order
to construct this circuit, we use the concept ...
Avaliação do desempenho dos métodos de proteção contra a perda de excitação em geradores síncronos: uma contribuição utilizando a teoria dos conjuntos nebulosos
(Universidade Federal de Santa Maria, 2008-07-28)
This work aims to evaluate the performance of the loss of field protection methods in synchronous generators. The methods are introduced to make available in a single text the various ways to protect the synchronous generator ...
Análise comparativa: sistemas estruturais convencionais e estruturas de lajes nervuradas
(Universidade Federal de Santa Maria, 2008-04-25)
This study has as objective to analyze, comparativily, the costs between the conventional structural systems and the rib slabs structural systems in reinforced concrete. Part of the estimated one that had to the great ...
Análise da conexão de geradores eólicos duplamente alimentados com compensação série
(Universidade Federal de Santa Maria, 2008-08-29)
This dissertation addresses the main problems related to doubly-fed induction generators
(DFIG) connection to grids with unbalanced voltages. Series compensation is used
to achieve balanced voltage on the stator of the ...
Análise da resistência de prismas e pequenas paredes de alvenaria estrutural cerâmica para diferentes tipos de argamassas
(Universidade Federal de Santa Maria, 2008-10-18)
This work has as main objective to analyze the influence of the ceramic block
geometry in the mechanical performance of the structural masonry, under centered
compression, when mortars with resistance varied are used. ...