Buscar
Itens para a visualização no momento 1-10 of 12
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 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 ...
Projeto automático de controlador de velocidade sem sensor mecânico para motores de indução trifásicos
(Universidade Federal de Santa Maria, 2008-08-27)
This works proposes parameters estimation algorithm to auto-tune the control
laws of a speed sensorless servo. The identification process of the electrical and
mechanical parameters is based on recursive least squares ...
Identificação automática dos parâmetros elétricos de motores de indução trifásicos
(Universidade Federal de Santa Maria, 2008-08-26)
This work presents an algorithm able to identify all electrical parameters of three
phase induction motor, with discrete realization, using a fixe-point digital signal
processor based platform. Some techniques presents ...
Extração e reconhecimento de caracteres ópticos a partir do co-projeto de hardware e software sobre plataforma reconfigurável
(Universidade Federal de Santa Maria, 2008-03-07)
This work presents the implementation and analysis of a system devoted to the extraction and recognition of optical characters which is based on the hardware and software co-design methodology and built over a reconfigurable ...
Gerador de indução isolado com tensão e freqüência reguladas por conversor matricial esparso
(Universidade Federal de Santa Maria, 2008-06-30)
The induction generator has characteristics making it interesting for alternative sources of energy, such as low cost, ruggedness, low maintenance, high availability and good dynamic behavior. So, it is very much applied ...
Servocontrole de velocidade aplicado a motores de indução monofásicos sem sensores mecânicos
(Universidade Federal de Santa Maria, 2008-10-31)
This work proposes a sensorless speed control applied to single-phase induction motors
(SPIM). The objective is to present an alternative for variable speed single-phase motor
drives for residencial applications, which ...
Controle de velocidade sensorless de motores de indução trifásicos sujeitos a distúrbios de torque
(Universidade Federal de Santa Maria, 2008-10-31)
This work presents a study of a sensorless speed servomechanism using threephase
induction motors. The aim is to investigate the performance of a specific control
technique when different load variations or torque ...