Desenvolvimento de ímãs para sensor de velocidade para motor de arranque de avião

Este trabalho teve por objetivo o desenvolvimento de ímãs de ferrita a serem utilizados em sensor de velocidade para motor de arranque de um avião, fabricado pela empresa Aeromot de Canoas – RS. Dois tipos de ímãs foram solicitados pela empresa: na forma de cilindro e na forma de anel. Para a confecção dos ímãs, foi utilizada uma matéria-prima com propriedades magnéticas já conhecidas, e as peças obtidas foram avaliadas a partir da curva de histerese. Finalmente, os ímãs foram montados nos sensores de velocidade protótipos e submetidos a testes de desempenho pela empresa Aeromot.The aim of this work is develop ferrite magnets used in speed sensor for outburst motor of an airplane, manufactured by the company Aeromot (Canoas – RS). Two magnets types were requested by the company, in the cylinder form and in the ring form. For the magnets manufacturing a raw material was used with known magnetic properties, however, the obtained pieces were appraised starting from the hysteresis curve. Finally the magnets was mounted in the speed sensor prototypes, and submitted the acting tests for the Aeromot company

Desenvolvimento de uma liga de aco inoxidavel martensitico pelo processo de metalurgia do po

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Análise de propriedades para verificar biocompatibilidade do titânio por metalurgia do pó

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Análise de propriedades para verificar biocompatibilidade do titânio por metalurgia do pó

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Influence of milling time during the mechanical alloying process on the properties of Fe-3Si-0.75P alloy

In this study the soft magnetic alloy Fe-3Si-0.75P (wt%) was obtained by mechanical alloying through powder metallurgy. The processing included the formulation of metallic powder, wet milling for 1 h, 3 h, 6h and 9 h, in an attritor mill using alcohol P.A. as a lubricant. Cold compaction was then performed in a floating die under 600 MPa pressure and, finally the ring-shaped test specimens were sintered at 1150 °C for 1h. The electrical, physical and magnetic properties were then analyzed using the following assays: Laser granulometry, density, metallography, hysteresis curve and AC permeability, resistivity and XRD. The results showed a strong influence of milling time on magnetic properties of the alloy. There was a decrease in grain size with the milling time, which is likely the cause of increased in magnetic properties

Study of sinterized soft magnetic materials for implementation in servomotors

Este trabalho tem por objetivo o estudo das propriedades de ligas ferromagnéticas obtidas por metalurgia do pó para a construção de núcleos de um servomotor, usualmente montados a partir de chapas de aço laminadas. A matéria prima utilizada foi o pó de ferro puro e ligas obtidas por mistura com diferentes percentuais de fósforo (1, 2 e 3%), silício (1, 3 e 5%) e níquel (50%). A caracterização dos materiais envolveu testes das principais propriedades magnéticas, elétrica e mecânicas. Os resultados encontrados para as propriedades magnéticas mostraram que as ligas sinterizadas possuem valores inferiores às dos núcleos de chapas. Entretanto, foi observado perdas menores por correntes de Foucault em decorrência do aumento da resistividade pela adição de fósforo, silício e níquel nas ligas de ferro. Nos ensaios de perdas magnéticas em núcleos, foi observado que em frequências baixas o material sinterizado apresenta perdas significativas e em frequências elevadas se comporta de forma similar aos núcleos de chapas laminadas.This paper aims to study the properties of ferromagnetic alloys obtained by powder metallurgy for the construction of cores of a servomotor, usually assembled from rolled steel sheets. The raw material used was pure iron powder and alloys obtained by mixing with different percentages of phosphorus (1, 2 and 3%), silicon (1, 3 and 5%) and nickel (50%). The material characterization involved tests of the main magnetic, electrical and mechanical properties of these alloys. The results obtained for the magnetic properties showed that the sintered alloys have lower values than the cores of plates. However, smaller losses were observed due to the increase in resistivity for the addition of phosphorus, silicon and nickel in the iron alloys. In the tests of magnetic losses in cores, it was observed that in low frequencies the sintered material presented significant losses, already in high frequencies behaved in a similar way to the cores of plates

北市居民觀賞錄影帶行為分析

The objective of this work was the development of a three-phase, six pole stepper motor with stator and rotor core built from Fe50%Ni alloy via powder metallurgy. The study involves analysis of the magnetic, electrical and mechanical properties, besides motor design and software simulation using finite elements. The Fe50%Ni alloy showed as result an electrical resistivity of 0.37 %%˙m, relative permeability of 946 and maximum induction of 0.93 T. In the computational simulation, with the application of 1 A current per phase, the required voltage was 2.88 V, which resulted in a power of 2.88 W. In this condition the stepper motor generates a torque of 6.81.10- 4 Nm with an air gap induction of 0.55 T