Stator
Mostrando 13-24 de 68 artigos, teses e dissertações.
-
13. Genetic algorithm for preliminary design optimisation of high-performance axial-flow compressors
This work presents an approach to optimise the preliminary design of high-performance axial-flow compressors. The preliminary design within the Gas Turbine Group at ITA, is carried on with an in-house computational program based upon the streamline curvature method, using correlations from the literature to assess the losses. The choice of many parameters of
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 19/12/2011
-
14. Simulação, projeto e teste de um gerador a relutância chaveado trifásico 6 x 4 / Simulation, design and test of a three-phase switched reluctance generator 6 x 4
Switched reluctance machines have received considerable attention from the scientific community due to advances in power electronics, and now is considered a promising electric machine for some applications, especially where variable speed operations are needed for motor or generator. Therefore, this work presents the dynamics of a switched reluctance machin
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 13/06/2011
-
15. Estratégia para estimação do conjugado eletromagnético de motores de indução / STRATEGY FOR THE ESTIMATION OF TORQUE ELECTROMAGNETIC INDUCTION MOTORS
The purpose of this work is to develop a strategy for determining the electromagnetic torque of induction motors (MIT) from the stator flux estimation, which presents higher robustness against parametric variations. The stator flux is estimated by integrating the voltage model of the machine, applying Highpass Filters (HFP) for ideal integration of electromo
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 13/05/2011
-
16. Control strategies applied for reducing the vibration and torque ripple of a special Switched Reluctance Motor
Despite its robustness the Switched Reluctance Motors (SRMs) present some inconvenient drawbacks as a major torque ripple, vibration and acoustic noise when compared to other types of motors. These characteristics are usually related to factors such as the salient poles in the stator and in the rotor, the switched feeding and the control strategy imposed by
Journal of Microwaves, Optoelectronics and Electromagnetic Applications. Publicado em: 2011-06
-
17. Evaluation of the normal force of a planar actuator
This paper describes a method to compute the normal force that acts on the mover of an electromagnetic planar actuator. The method is based on the Maxwell Stress Tensor and depends on the resulting magnetic field. The actuator has a mover with two permanent magnets and a ferromagnetic stator covered by two orthogonal armature coils. The mover is hold by a su
Publicado em: 2011
-
18. Oxygen potencial effects on the oxidation sublayer and its influence on the magnetic properties of eletric steels after the final annealing heat treatment. / O efeito do potencial de oxigênio na oxidação subsuperficial e suas influências nas propriedades magnéticas de aços elétricos após o recozimento final.
Semi processed electrical steels, used for the manufacture of rotor and stator laminations are acquired from Steel Markers and after being punched in its final shape, must undergo an annealing heat treatment, which aims to improve the magnetic properties of the steel. If this heat treatment is carried out under inappropriate conditions, the dissolved element
Publicado em: 2010
-
19. Controle linear de maximo torque do motor sincrono de imãs permanentes interiores / A linear maximum torque control of the interior permanent magnet synchronous motor
In this work is presented the linear maximum torque control of an interior permanent magnet synchronous operating in the constant torque and field weakening ranges. The constant torque control is implemented by using the maximum torque per Ampére curve of the motor. The terminal stator voltage remains constant along the field weakening range due to the arma
Publicado em: 2009
-
20. CONTRIBUTION TO THE STUDY OF PERMANENT MAGNET SYNCHRONOUS ADVANCED DRIVE: APPROACH BASED ON HIGHER ORDER SLIDING MODES CONTROL / CONTRIBUIÇÃO AO ESTUDO DO ACIONAMENTO AVANÇADO DO MOTOR SÍNCRONO DE ÍMÃS PERMANENTES: ABORDAGEM BASEADA NOS MODOS DESLIZANTES DE ORDEM SUPERIOR
This work presents a study of first and second order sliding mode controllers applied to permanent magnet synchronous motor.The aim is a theoretical study and an experimental implementation, using the DSP TMS320F2812 platform, of two second order sliding mode controllers. In addiction a study about the first order sliding mode is presented. The inclusion of
Publicado em: 2009
-
21. Coarse particle suspension in mechanical flotation cells. / Suspensão de partículas grossas em células mecânicas de flotação.
Several attempts to correlate particle size and flotation response at the biggest Brazilian plants (iron ore and phosphate) have concluded that coarse particles (dp 100m) do not float efficiently. As solids suspension is a necessary precondition for particle collection, the study of coarse particle suspension in mechanical cells is fully justified and it is
Publicado em: 2009
-
22. LINEAR ULTRASONIC MOTOR WITH TUBULAR GEOMETRY / MOTOR ULTRA-SÔNICO LINEAR COM GEOMETRIA TUBULAR
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 of this geometry, not explored yet, a new study on interaction between resonance modes in a hollow cylinder for linear movement gen
Publicado em: 2008
-
23. 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
-
24. Controle vetorial de velocidade de um motor de indução trifásico com estimação neural de fluxo
This work describes the study and the implementation of the speed control for a three-phase induction motor of 1,1 kW and 4 poles using the neural rotor flux estimation. The vector speed control operates together with the winding currents controller of the stator phasis. The neural flux estimation applied to the vector speed controls has the objective of com
Publicado em: 2008