Torque Oscillations
Mostrando 1-8 de 8 artigos, teses e dissertações.
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1. Modelagem do motor de indução trifásico alimentado de forma não tradicional conversor eletromecânico de conjugado para baixas velocidades
O objetivo desta tese de doutorado é desenvolver um método para gerar uma variação temporal de conjugado desejado em um motor de indução, em baixas velocidades, por meio da manipulação da forma de onda das tensões de entrada. O modelo matemático para o motor de indução considera seu rotor bloqueado, uma vez que visa aplicações em baixas velocid
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 02/05/2011
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2. CONTRIBUTION TO THE CONNECTION OF DOUBLY-FED INDUCTION GENERATORS WITH A SERIES GRID SIDE CONVERTER / ANÁLISE DA CONEXÃO DE GERADORES EÓLICOS DUPLAMENTE ALIMENTADOS COM COMPENSAÇÃO SÉRIE
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 machine, avoiding torque oscillations and high currents due to the grid voltage unbalance. The DC-link voltage control proposed reduces the c
Publicado em: 2008
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3. Propriedades físicas de bicamadas magnéticas
The magnetic order of bylayers composed by a ferromagnetic film (F) coupled with an antiferromagnetic film (AF) is studied. Piles of coupled monolayers describe the films and the interfilm coupling is described by an exchange interaction between the magnetic moments at the interface. The F has a cubic anisotropy while the AF has a uniaxial anisotropy. We ana
Publicado em: 2007
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4. Stretch reflex oscillations and essential tremor.
Using a computer-controlled torque motor and manipulandum, 50 ms torque pulses and 70 second trains of binary pseudorandom torque disturbances were applied to the wrists of 10 adult controls and 22 patients with essential tremor in order to study the interaction between mechanically-induced stretch-reflex oscillations and essential tremor. These two oscillat
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5. Myotatic reflexes and the on-off effect in patients with Parkinson's disease.
Reflex activity in the biceps and triceps muscles evoked by applied torque perturbations was studied in patients with Parkinson's disease. The perturbations consisted of single pulses or of pseudo-random sequences of pulses of torque. The patients were treated with levodopa and some exhibited marked fluctuations in their clinical disabilities ("on-off" effec
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6. Drosophila Mushroom Bodies Are Dispensable for Visual, Tactile, and Motor Learning
A total of 18 associative learning/memory tests have been applied to Drosophila melanogaster flies lacking mushroom bodies. Only in paradigms involving chemosensory cues as conditioned stimuli have flies been found to be compromised by a block in the mushroom body pathway. Among the learning tasks not requiring these structures are a case of motor learning (
Cold Spring Harbor Laboratory Press.
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7. Instability in human forearm movements studied with feed-back-controlled electrical stimulation of muscles.
1. Amplitude-modulated electrical stimulation was applied to the elbow flexors and extensors to produce movements of the forearm in normal subjects. The parameters of the modulating (command) signal were set in isometric trials so as to produce equal and opposite background torques, and equal and supportive torque modulations. 2. Bode plots relating forearm
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8. Oscillatory electromyographic responses to limb displacement in Parkinsonism.
Forty Parkinsonian patients and 26 normal subjects were instructed not to resist movements of a handle which they maintained in a specified position (1) during tonic activation of muscles against the force produced by a torque motor and (2) while no force was produced by the motor. Electromyographic responses to handle displacements were recorded in biceps m