Um estudo comparativo dos harmônicos de torques gerados pelos inversores de tensão de freqüência variável

• Ano de defesa: 2007
• Autor(a) principal: Gonella, Giovanni
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Programa de Pós-graduação em Engenharia Mecânica; Engenharia Mecânica
• Palavras-chave em Português: Engenharia mecânica; Motores de indução; Dinâmica de rotores; Correntes de alta frequência; Inversores de frequência; Harmônicos de torque.; Inverters; Mechanichal engineering; Induction motors; Harmonic of torque; CNPQ::ENGENHARIAS::ENGENHARIA MECANICA
• Link de acesso: https://app.uff.br/riuff/handle/1/17481

The use of Variable Frequency Power Inverters, mainly those used with induction motors, is a practice that has progressively allowed the replacement of mechanical speed reducers. However, this practice has led to new challenges and uncertainties. From the electric point of view, research continues to propose new control techniques for conventional inverters and new configurations to reduce the negative effect of voltage and current harmonics over electrical systems and also on its load. For these reasons, some induction motors manufactures offer modified units aiming to reduce the high frequency currents through the bearings and also to reduce the high variation effect of voltage that overcome the isolation limits of conductors. This work intends to contribute to determining the mechanical effects of these equipments over the rotor. For this, for the same load conditions, numerical simulations were performed. The effects of a conventional inverter were compared with the effects of a three-level multilevel inverter, as it is a promissory device for high and medium voltage applications.