Sistemas de isolação para máquinas elétricas de baixa tensão utilizando manufatura aditiva

Abstract

Electric motors are a key asset in modern industry; they are the most used driving form. After time, failures may occur, thus making it necessary to repair these electrical machines, one of the steps being the replacement of the insulation system. Currently, most repair shops use a manual process, which results in low productivity and little repeatability. Among the technologies that have the potential to contribute to the automation of manufacturing processes is additive manufacturing. Therefore, the objective of this work was to verify the application of additive manufacturing (3D printing) in the construction of insulation systems, especially slot insulation. For this, prototyping of insulators was conducted using the Fused Filament Fabrication (FFF) technique, and subsequently, the assembly of the insulators together with the coils was evaluated. The selected materials were ABS, polyamide 6 (PA6), PETG, and TRITAN®. These materials had their thermal stability studied by examining changes in the modulus of elasticity, yield strength, and tensile strength when exposed for 500, 1000, and 2000 hours at 105 ºC. It was found that PA6 was the only material approved for prototyping and that TRITAN® has excellent thermal stability.