Análise comportamental do motor de indução trifásico submetido a desequilíbrios de tensão sob o ponto de vista de conjugado e rendimento

Abstract

Three-Phase Induction Motors (TIM) are widely used in the industrial sector, representing about a quarter of the electricity consumed in the country. Due to this importance in the national scenario, some researchers have published studies involving unbalanced voltages applied to these motors. On the aforementioned subject, this dissertation reports that, based on computer simulations which use three theoretical modeling and laboratory experiments under different unbalanced voltages, changes in torque and efficiency of the TIM are quite high, except when specifying the positive sequence component of the voltage in addition to percentage unbalance. However, the process of identifying boundaries using two indexes simultaneously is more complex. The study presents an alternative method for assessing the performance of an engine subjected to unbalanced voltages based on employing the arithmetic mean of the voltage amplitudes. Using this proposal it is shown that the ranges can be reduced to acceptable levels.