265 resultados para Mecanismos de indução


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Pós-graduação em Agronomia (Entomologia Agrícola) - FCAV

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This paper proposes the conversion of a three-phase induction motor into single phase through rewinding its stator. It presents a methodology to calculate this rewinding process considering the constructive parameters of the, such as number of slots and number of poles, for instance. The operating principles of DC motors are highlighted to introduce the logic involved in the calculation of lap and wave windings. The construction of the stator three-phase induction motor generally uses the lap winding, which is also used in single phase to perform the conversion. The rewinding process is widely used for reconstruction of industrial and residential electric motors that have suffered damage or present flaws with use. Therefore, many three-phase electric motors that are discarded or disposed of could be recovered by the method described in this work for a purpose that contributes to energy efficiency or simply saving resources in single-phase uses

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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

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Pós-graduação em Agronomia (Produção Vegetal) - FCAV

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Our main concern was to investigate the forms and rationalities implicit in the social regulation/autonomy of the management processes of learning, historically established in the 1971 through 2002 educational reforms, via assessment guidelines of school performance in the state of São Paulo. We used a socio-historical approach, relying on speeches and official documents as our primary source and on studies and research work about teacher assessment and performance as secondary sources. As central categories we considered continuity and rupture in the patterns and mechanisms of social regulation/autonomy of educational work. The results help to clarify how educational policies, instituted in contexts of social reproduction/transformation, influence the management of educational processes within the school.

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Pós-graduação em Ciência e Tecnologia Animal - FEIS

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Written language is a form of communication between humans and, as is not acquired naturally, needs educational interventions systematized to be learned. However, the teaching of writing is still mechanically imposed on the student, and could make use of other features such as games and plays. As a result, this research we analyze the writing development of phases, the psychic functions present in its development and the construction of a paradigm games and games that can be used as auxiliary tools in the teaching of writing. We describe the operation of each and identify how they can be used in the classroom. The survey was conducted through a qualitative approach of empirical type. The data concluded that these instruments are not used in class and often writing has no social relevance for the child. We also conclude that some usage scenarios of play occurred among children, are not used for didactic purposes as an example of sign-symbol relationship by teachers to teach writing