Motors
Mostrando 13-24 de 454 artigos, teses e dissertações.
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13. Impact Analysis of PM magnetization level on motor performance: simulations and experimental results
Abstract This paper addresses the impact of magnetization level tolerances in ferrite-based permanent magnets (PM) on the performance of brushless DC motors. A case study is prepared using three motor prototypes assembled with controlled samples of ferrite arc segments, in terms of magnetization. The investigation is performed both experimentally and through
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2017-03
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14. Estimation of Three-Phase Induction Motor Equivalent Circuit Parameters from Manufacturer Catalog Data
Abstract The single phase equivalent circuit is largely used to model the three-phase induction motors in steady-state operation and under sinusoidal balanced voltages. Depending on the desired application, the circuit may or may not represent core losses, a double cage or even the variation of parameters due to skin effect and saturation. However, the deter
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2017-03
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15. Development of an Analytical Method to Predict the Behaviour of the Magnetic Field in PM Linear Motors with Halbach Array
Abstract This paper describes the application of the method of separation of variables and the use of Fourier series for solving the Laplace's and Poisson's equations on the study and analysis of the magnetic field produced in a linear motor with Halbach array. Equations for predicting the 2D magnetic flux density distribution produced in the air gap were de
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2017-03
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16. Anomalous Behavior of a Solid Rocket Motor Nozzle Insert During Static Firing Test
ABSTRACT This paper presents the study and development of a firing test used to evaluate the behavior of a solid rocket motor. The motivation for the development of a subscale solid rocket motor with end burning propellant grain geometry arose from the need to evaluate the nozzle inserts of graphite for the possible replacement with the carbon fiber-reinforc
J. Aerosp. Technol. Manag.. Publicado em: 2016-12
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17. Qualification of Magnesium/Teflon/Viton Pyrotechnic Composition Used in Rocket Motors Ignition System
ABSTRACT The application of fluoropolymers in highenergy-release pyrotechnic compositions is common in the space and defense areas. Pyrotechnic compositions of magnesium/Teflon/Viton are widely used in military flares and pyrogen igniters for igniting the solid propellant of a rocket motor. Pyrotechnic components are considered highrisk products as they may
J. Aerosp. Technol. Manag.. Publicado em: 2016-06
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18. Swirl Injection Effects on Hybrid Rocket Motors
ABSTRACT: In the last decades, hybrid rocket engines have been increasingly studied and used in space vehicles. However, the low regression rates and specific impulses still represent major drawbacks to this technology. The objective of this study was to quantify the relative improvement of regression rate values with the use of a swirling flow injector in c
J. Aerosp. Technol. Manag.. Publicado em: 2015-12
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19. Hearing Profile of Brazilian Forestry Workers' Noise Exposure
Introduction Researchers studying the hearing health of forestry workers have revealed the presence of a noise-induced hearing loss (NIHL) in this population and have concluded that the vibration of the equipment, the carbon monoxide released by motors, and pesticides might also contribute to NIHL.
Objective Int. Arch. Otorhinolaryngol.. Publicado em: 2015-03
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20. Small Solid Propellant Launch Vehicle Mixed Design Optimization Approach
ABSTRACT: For a small country with limited research budget and lack of advanced space technology, it is imperative to find new approaches for the development of low-cost launch vehicles (LV), which is, among all possibilities, an interesting option for rapid access to space, focused on integration of acquired components complemented with indigenously develop
J. Aerosp. Technol. Manag.. Publicado em: 2014-09
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21. Effect of Varying Design Options on the Transient Behavior of a Hybrid Rocket Motor
ABSTRACT: Hybrid rockets provide compelling features for use in atmospheric and space rocket propulsion. One of the prominent applications of hybrid rockets which foster on its characteristics is the propulsion of micro air launch vehicles. In this paper, a set of design options of a hybrid rocket motor is evaluated for propulsion of micro air launch vehicle
J. Aerosp. Technol. Manag.. Publicado em: 2014-03
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22. Experimental Study of Polyurethane-Based Fuels with Addition of Paraffin and Aluminum for Hybrid Rocket Motors
ABSTRACT: Experimental investigation was conducted to determine the relative propulsive and combustion behavior of several polyurethane-based solid-fuel formulations containing 30% w/w of paraffin or 10% of aluminum powder. In total, seven solid-fuel formulations were investigated, four containing 30% of paraffin and three with 10% of aluminum. The polyureth
J. Aerosp. Technol. Manag.. Publicado em: 2013-09
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23. A Reestruturação produtiva e o processo de trabalho em Catalão (Goiás): uma abordagem sobre o modo de vida da classe trabalhadora / The restructuring of production and work processes in Catalao (Goiás): an approach to the way of life of the working class
Este estudo busca compreender como o processo de industrialização em Catalão (Goiás), representado pela instalação de montadoras automobilísticas, repercute no modo de vida dos trabalhadores da Mitsubishi Motors Company, em seu cotidiano. A escolha do objeto de estudo fundamenta-se na percepção das profundas transformações que o processo de trabal
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 30/08/2012
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24. Uma contribuição ao estudo e desenvolvimento de técnicas de controle de potências ativa e reativa do gerador de relutância varável para aplicação em sistemas de geração eólica de pequena potência / A constribution to the study and development of techniques for control of active and reactive power of the switched reluctance generator for application in wind power generation systems of small power
O objetivo deste trabalho é o de propor técnicas de controle de potências ativa e reativa de geradores de relutância variável (GRV) aplicados `a geração eólica de energia eólica. Desenvolveu-se uma técnica de controle direto de potência ativa utilizando um controlador proporcional-integral e outra técnica utilizando um controlador de modos desliz
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 24/08/2012