Thermal Behavior of a Three-Phase Motor with Speed Reducer Under Different Load Levels
DOI:
https://doi.org/10.61236/p02p1f28Keywords:
Three-phase induction motor, thermal behavior, casing temperature, mechanical load, speed reducerAbstract
This study analyzed the thermal behavior of a three-phase induction motor under two operating configurations, one without a speed reducer and the other with a speed reducer, considering a no-load condition and four successive loaded operation stages defined according to reference current levels. Housing temperature was used as the main variable, while line current and rotational speed were used as support variables to interpret the operating condition of the system. The tests lasted 120 min, with measurements recorded every 10 min. The results showed that, in both configurations, temperature increased progressively with operating demand and service time. However, under the adopted experimental criterion, the configuration with the speed reducer exhibited greater thermal severity under all evaluated conditions, including no-load operation. Likewise, the comparison between final current and final temperature indicated that current alone did not explain the thermal difference observed between the two configurations. Overall, the findings show that the thermal assessment of three-phase motors in service should consider not only electrical variables but also the mechanical configuration under which the system operates
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