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DOS CABIDES DE EMPREGO AOS CABIDES DO CONHECIMENTO: UM CASO DE PARCERIA ENTRE O INSTITUTO GENERAL MOTORS E A ESCOLAMUNICIPAL DE ENSINO PROFª. ALCINA DANTAS FEIJÃO NO DESENVOLVIMENTO DA RESPONSABILIDADE SOCIAL EMPRESARIAL

O Brasil, até poucos anos atrás, não via em sua agenda de prioridades a educação como foco principal para o crescimento econômico, talvez por não acreditar que com a estabilidade da moeda, abertura da economia e outros fatores necessitassem de pessoal qualificado para poder manter a capacidade produtiva. Assim, o país tenta corrigir esta situação investindo em educação, incorporando novas tecnologias no processo produtivo, necessitando de uma força de trabalho hábil para aprender e desenvolver as novas técnicas. Atualmente o Brasil mantém um dos menores índices de desemprego, no entanto, muitas empresas sofrem com o apagão da qualificação, necessitando realizar treinamentos e por consequência aumento em seus custos. As empresas tentam driblar a falta de pessoal qualificado investindo nos programas de estágio e trainee, realizando contratações de profissionais estrangeiros, criando universidades corporativas, e em alguns casos, as empresas estreitam seus laços junto às redes de ensino, a fim de preparar jovens para o domínio de novas tecnologias, associado ao aprimoramento em sua área de atuação, evitando assim o desequilíbrio entre teoria e prática . As organizações empresariais conscientes de seu papel começam a compreender que a prosperidade tão almejada não se traduz por faturamentos vultosos ou simplesmente pela quantidade de produtos vendidos. Estas despertam para a criação e adaptação de empresas-cidadãs que por meio de suas ações sociais, buscam desenvolver atividades solidárias. Neste contexto, o presente trabalho tem como objetivo geral analisar a Responsabilidade Social Empresarial sob a ótica de parcerias com escolas (parceria entre a General Motors do Brasil, por meio de seu braço social - o Instituto General Motors e a Escola Municipal de Ensino Profª. Alcina Dantas Feijão da Cidade de São Caetano do Sul). A parceria se concretiza, por meio do Programa Jovens Empreendedores ou Fábrica de Cabides . O intuito do Programa é despertar o espírito empreendedor nos estudantes e incentivar a formação de futuros empresários. Com os objetivos específicos determinou-se: a) estudar parcerias entre empresas e escolas no desenvolvimento da RSE; b) entender os motivos que levaram a empresa e a escola a concretizar a parceria e suas expectativas; c) identificar possíveis alterações ocorridas na escola, atribuídas ao processo de parceria. A partir destes objetivos, o procedimento metodológico foi orientado pelo método de estudo de caso, objetivando uma pesquisa mais voltada para abordagem qualitativa, levantando-se referenciais teóricos, bem como, procedimentos de análise de dados por meio de questionário, observação direta e artefatos físicos. A análise compreensiva dos dados foi realizada a partir de dois núcleos temáticos: importância da parceria e mercado de trabalho. Os resultados evidenciam que iniciativas de parcerias podem se reverter em melhoria da qualidade de ensino que permita o desenvolvimento de habilidades e competências necessárias à inserção responsável no mercado de trabalho com uma dimensão cidadã.

The relationship between the level of domestic demand in Britain an dthe exports of the British motor car industry

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Integrated magnetic components for high-power high-current dc-dc converters

This thesis is focused on the design and development of an integrated magnetic (IM) structure for use in high-power high-current power converters employed in renewable energy applications. These applications require low-cost, high efficiency and high-power density magnetic components and the use of IM structures can help achieve this goal. A novel CCTT-core split-winding integrated magnetic (CCTT IM) is presented in this thesis. This IM is optimized for use in high-power dc-dc converters. The CCTT IM design is an evolution of the traditional EE-core integrated magnetic (EE IM). The CCTT IM structure uses a split-winding configuration allowing for the reduction of external leakage inductance, which is a problem for many traditional IM designs, such as the EE IM. Magnetic poles are incorporated to help shape and contain the leakage flux within the core window. These magnetic poles have the added benefit of minimizing the winding power loss due to the airgap fringing flux as they shape the fringing flux away from the split-windings. A CCTT IM reluctance model is developed which uses fringing equations to accurately predict the most probable regions of fringing flux around the pole and winding sections of the device. This helps in the development of a more accurate model as it predicts the dc and ac inductance of the component. A CCTT IM design algorithm is developed which relies heavily on the reluctance model of the CCTT IM. The design algorithm is implemented using the mathematical software tool Mathematica. This algorithm is modular in structure and allows for the quick and easy design and prototyping of the CCTT IM. The algorithm allows for the investigation of the CCTT IM boxed volume with the variation of input current ripple, for different power ranges, magnetic materials and frequencies. A high-power 72 kW CCTT IM prototype is designed and developed for use in an automotive fuelcell-based drivetrain. The CCTT IM design algorithm is initially used to design the component while 3D and 2D finite element analysis (FEA) software is used to optimize the design. Low-cost and low-power loss ferrite 3C92 is used for its construction, and when combined with a low number of turns results in a very efficient design. A paper analysis is undertaken which compares the performance of the high-power CCTT IM design with that of two discrete inductors used in a two-phase (2L) interleaved converter. The 2L option consists of two discrete inductors constructed from high dc-bias material. Both topologies are designed for the same worst-case phase current ripple conditions and this ensures a like-for-like comparison. The comparison indicates that the total magnetic component boxed volume of both converters is similar while the CCTT IM has significantly lower power loss. Experimental results for the 72 kW, (155 V dc, 465 A dc input, 420 V dc output) prototype validate the CCTT IM concept where the component is shown to be 99.7 % efficient. The high-power experimental testing was conducted at General Motors advanced technology center in Torrence, Los Angeles. Calorific testing was used to determine the power loss in the CCTT IM component. Experimental 3.8 kW results and a 3.8 kW prototype compare and contrast the ferrite CCTT IM and high dc-bias 2L concepts over the typical operating range of a fuelcell under like-for-like conditions. The CCTT IM is shown to perform better than the 2L option over the entire power range. An 8 kW ferrite CCTT IM prototype is developed for use in photovoltaic (PV) applications. The CCTT IM is used in a boost pre-regulator as part of the PV power stage. The CCTT IM is compared with an industry standard 2L converter consisting of two discrete ferrite toroidal inductors. The magnetic components are compared for the same worst-case phase current ripple and the experimental testing is conducted over the operation of a PV panel. The prototype CCTT IM allows for a 50 % reduction in total boxed volume and mass in comparison to the baseline 2L option, while showing increased efficiency.

Resonant power conversion topologies for inductive charging of electrical vehicle batteries

This thesis is concerned with inductive charging of electric vehicle batteries. Rectified power form the 50/60 Hz utility feeds a dc-ac converter which delivers high-frequency ac power to the electric vehicle inductive coupling inlet. The inlet configuration has been defined by the Society of Automotive Engineers in Recommended Practice J-1773. This thesis studies converter topologies related to the series resonant converter. When coupled to the vehicle inlet, the frequency-controlled series-resonant converter results in a capacitively-filtered series-parallel LCLC (SP-LCLC) resonant converter topology with zero voltage switching and many other desirable features. A novel time-domain transformation analysis, termed Modal Analysis, is developed, using a state variable transformation, to analyze and characterize this multi-resonant fourth-orderconverter. Next, Fundamental Mode Approximation (FMA) Analysis, based on a voltage-source model of the load, and its novel extension, Rectifier-Compensated FMA (RCFMA) Analysis, are developed and applied to the SP-LCLC converter. The RCFMA Analysis is a simpler and more intuitive analysis than the Modal Analysis, and provides a relatively accurate closed-form solution for the converter behavior. Phase control of the SP-LCLC converter is investigated as a control option. FMA and RCFMA Analyses are used for detailed characterization. The analyses identify areas of operation, which are also validated experimentally, where it is advantageous to phase control the converter. A novel hybrid control scheme is proposed which integrates frequency and phase control and achieves reduced operating frequency range and improved partial-load efficiency. The phase-controlled SP-LCLC converter can also be configured with a parallel load and is an excellent option for the application. The resulting topology implements soft-switching over the entire load range and has high full-load and partial-load efficiencies. RCFMA Analysis is used to analyze and characterize the new converter topology, and good correlation is shown with experimental results. Finally, a novel single-stage power-factor-corrected ac-dc converter is introduced, which uses the current-source characteristic of the SP-LCLC topology to provide power factor correction over a wide output power range from zero to full load. This converter exhibits all the advantageous characteristics of its dc-dc counterpart, with a reduced parts count and cost. Simulation and experimental results verify the operation of the new converter.

Magnetic materials and soft-switched topologies for high-current DC-DC converters

The thesis is focused on the magnetic materials comparison and selection for high-power non-isolated dc-dc converters for industrial applications or electric, hybrid and fuel cell vehicles. The application of high-frequency bi-directional soft-switched dc-dc converters is also investigated. The thesis initially outlines the motivation for an energy-efficient transportation system with minimum environmental impact and reduced dependence on exhaustible resources. This is followed by a general overview of the power system architectures for electric, hybrid and fuel cell vehicles. The vehicle power sources and general dc-dc converter topologies are discussed. The dc-dc converter components are discussed with emphasis on recent semiconductor advances. A novel bi-directional soft-switched dc-dc converter with an auxiliary cell is introduced in this thesis. The soft-switching cell allows for the MOSFET's intrinsic body diode to operate in a half-bridge without reduced efficiency. The converter's mode-by-mode operation is analysed and closed-form expressions are presented for the average current gain of the converter. The design issues are presented and circuit limitations are discussed. Magnetic materials for the main dc-dc converter inductor are compared and contrasted. Novel magnetic material comparisons are introduced, which include the material dc bias capability and thermal conductivity. An inductor design algorithm is developed and used to compare the various magnetic materials for the application. The area-product analysis is presented for the minimum inductor size and highlights the optimum magnetic materials. Finally, the high-flux magnetic materials are experimentally compared. The practical effects of frequency, dc-bias, and converters duty-cycle effect for arbitrary shapes of flux density, air gap effects on core and winding, the winding shielding effect, and thermal configuration are investigated. The thesis results have been documented at IEEE EPE conference in 2007 and 2008, IEEE APEC in 2009 and 2010, and IEEE VPPC in 2010. A 2011 journal has been approved by IEEE Transactions on Power Electronics.