Effects of sequence voltage components on torque and efficiency of a three-phase induction motor

For quantifying voltage unbalance, some standards adopt the index provided by the ratio between the negative and positive sequence component magnitudes. In these documents, the use of an indicator that includes the zero sequence component is not obligatory. This article presents the results from evaluations of the effects of the zero, negative and positive sequence voltage components on the torque and efficiency of a three-phase induction motor. These evaluations are performed through laboratory experiments and the application of incremental sensitivity analysis. The results of this investigation allow for, among other things, identifying the consequences of the absence of the zero sequence component in unbalance quantification.