Electromagnetic Force
Mostrando 1-12 de 22 artigos, teses e dissertações.
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1. Sobre o surgimento das equações de Maxwell
Resumo Em seu Sobre linhas de força físicas Maxwell apresentou a primeira versão de suas equações eletromagnéticas, quando a luz foi então encarada como distúrbio cisalhante em um éter fluido e elástico. No presente artigo procuro discutir os detalhes deste modelo mecânico que serviu de trampolim para Maxwell propor a teoria eletromagnética da lu
Rev. Bras. Ensino Fís.. Publicado em: 01/07/2019
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2. Electromagnetism as a world view: implications for the teaching of energy
There are considerable differences in the ways mechanics and electromagnetism conceptualize energy. In the former, energy is defined in terms of force and work in a process-like reasoning that remits us to the ”past” of a given body or system. Moreover, in the mechanical framework energy is ascribed to matter, i.e., one speaks of the energy of a system o
Rev. Bras. Ensino Fís.. Publicado em: 22/06/2017
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3. An analysis on electric and magnetic behaviour on an induction planar actuator
The induction planar actuator, i.e. IPA, proposed in this study presents an electromagnetic structure formed by a static ferromagnetic core with an aluminium plate that corresponds to the secondary, and a mover, also called primary. The latter comprehends two three-phase windings, mounted in an armature core, which are orthogonal to each other. When they are
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2013-06
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4. 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
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5. Simplified Mathematical Modeling for an Electromagnetic Forming System with Flat Spiral Coil as Actuator
This study presents mathematical modeling and calculation procedure for problems of electromagnetic forming of thin circular metal sheets using a flat spiral coil as actuator. The methodbased on the Biot-Savart Law focuses specifically on the calculation of the electromagnetic field generated by the flat coil and analysis of the circuit that models the elect
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2011-09
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6. Electromagnetic field simulation and crack analysis of electromagnetic forming of Magnesium alloy tube
The AZ31 magnesium alloy tube was used for electromagnetic forming experiment of three kinds of input voltages. The stress-strain state of tube forming was analyzed. It was shown that the cause of oblique crack of tube was σr of axial inhomogeneous distribution and σz, and the cause of longitudinal crack was σr and σè of inhomogeneous distribution in ci
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2011-03
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7. Numerical model of electromagnetic stirring for continuos casting billets
Thispaperintroducesanumericalmodelofanelectromagnetic rotary stirrer based on the finite-element model.Such stirrers are used to improve the quality of continuously cast steel, particularly billets and blooms. The method determines the magnetic flux density profile and compares it to experimental measurements. In addition, it calculates the Lorentz force fie
Publicado em: 2011
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8. 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
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9. Comparative study of two commercially pure titanium casting methods
The interest in using titanium to fabricate removable partial denture (RPD) frameworks has increased, but there are few studies evaluating the effects of casting methods on clasp behavior. OBJECTIVE: This study compared the occurrence of porosities and the retentive force of commercially pure titanium (CP Ti) and cobalt-chromium (Co-Cr) removable partial den
Journal of Applied Oral Science. Publicado em: 2010-10
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10. Occlusal force, masticatory cycles and mandibular flexure of subjects with different facial types / Força de mordida, ciclos mastigatorios e deflexão mandibular em individuos com diferentes tipos faciais
Bite force can influence the development of the masticatory function and consequently the rehabilitation therapeutics. The high variability of this muscular function indicator can be associated to intrinsic aspects of the stomatognathic system such as the vertical facial morphology. However, the influence of this morphology on the maximum bite force and func
Publicado em: 2008
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11. Electromechanical stresses in transformers caused by through-fault and inrush currents / Estresse eletromecânico em transformadores causado por curtos-circuitos passantes e correntes de energização
Transformadores de potência são dispositivos fundamentais para a operação de sistemas de potência e têm um peso significativo no custo total de uma instalação. Além dos custos de manutenção e substituição, as falhas nos transformadores devem ser levadas em consideração, no sentido de manter tanto a continuidade do fornecimento de energia como
Publicado em: 2007
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12. Motor de indução bifásico em rede de alimentação bifásica simétrica com condutor de retorno
The main task of this work is to provide a contribution to help a more deep understanding on the operation of the asymmetrical twophase induction motor with return for applications in places where a possibility of a two-phase network feeding exists. important contributions where obtained with the help of a time domain dynamic model for symmetrical and asymme
Publicado em: 2006