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Abstract(s)
Os variados setores da indústria, tendo por objetivo otimizar os processos de produção e evitar custos substanciais devido a perdas de produção não programadas, têm exigido que os setores relacionados com a manutenção dos equipamentos adotem medidas que estão inseridas no âmbito da manutenção preventiva. O Motor de Indução Trifásico representa de momento a máquina elétrica rotativa mais utilizada nos setores industriais. Deste modo, existe a necessidade de adotar sistemas de detecção e diagnóstico de avarias para este tipo de máquinas. O trabalho que irá ser desenvolvido nesta dissertação apresenta, como objetivo principal, propor técnicas de diagnóstico de avarias que têm por base o uso do quadrado do sinal da corrente elétrica estatórica. Através das diversas técnicas apresentadas será efetuado um estudo pormenorizado para se concluir, por um lado, qual a técnica que apresenta um conteúdo espectral com maior informação e, por outro, estabelecer o conceito de índice de severidade e ainda concluir qual técnica que apresenta a melhor relação entre o valor percentual da carga e este índice. Para a implementação experimental deste trabalho, foi desenvolvido um sistema de aquisição de sinais, assim como, foram modificados fisicamente motores, de modo a realizar ensaios em vazio e em carga que se aproximassem das situações de avaria real.
Currently, the various sectors of industry to optimize production processes and avoid substantial costs to companies due to unscheduled production losses have required equipment maintenance sectors to adopt measures that fall within the scope of preventive maintenance. The Three-Phase Induction Motor currently represents the most widely used rotary electric machine in the industrial sectors. Thus, there is a need to adopt fault detection and diagnosis systems for this type of machines. The work that will be developed in this dissertation presents as main objective, to propose fault diagnosis techniques based on the use of the signal square. of the statistical electric current. Through the various techniques presented, a detailed study will be carried out to conclude, on the one hand, which technique has a spectral content with more information, on the other hand, to establish the concept of severity index and to conclude which technique has the best relation between the percentage value of the load and this index. For the implementation of this work, a signal acquisition system was developed, as well as motors that were physically modified to carry out electrical tests under load and nozzle that approached the actual fault situation.
Currently, the various sectors of industry to optimize production processes and avoid substantial costs to companies due to unscheduled production losses have required equipment maintenance sectors to adopt measures that fall within the scope of preventive maintenance. The Three-Phase Induction Motor currently represents the most widely used rotary electric machine in the industrial sectors. Thus, there is a need to adopt fault detection and diagnosis systems for this type of machines. The work that will be developed in this dissertation presents as main objective, to propose fault diagnosis techniques based on the use of the signal square. of the statistical electric current. Through the various techniques presented, a detailed study will be carried out to conclude, on the one hand, which technique has a spectral content with more information, on the other hand, to establish the concept of severity index and to conclude which technique has the best relation between the percentage value of the load and this index. For the implementation of this work, a signal acquisition system was developed, as well as motors that were physically modified to carry out electrical tests under load and nozzle that approached the actual fault situation.
Description
Dissertação submetida como requisito parcial para obtenção do grau de Mestre em Engenharia Eletrotécnica e Computadores
Keywords
Motores de indução trifásicos Deteção e diagnóstico de avarias Sinal da corrente elétrica estatórica ao quadrado Análise espectral em frequência Three-Phase induction motor Fault detectios and diagnosis Signal of electric current squared of stator Frequency spectral analysis
Citation
Publisher
Instituto Politécnico de Setúbal. Escola Superior de Tecnologia de Setúbal