Abstract

In this paper the effects of voltage unbalance in both the Complex Current Unbalance Factor (CCUF) and the Torque Ripple Factor (TRF) of a three-phase induction motor have been discussed. The effects of 13060 points of voltage unbalance taken around the limit of standards (VUF = 2%) have been analyzed, since the largest number of international standards use this value as the limit. For the analysis, the single cage model of three-phase induction motor was used. The voltage unbalance has been characterized through four parameters: type, module of Complex Voltage Unbalance Factor (VUF), angle of Complex Voltage Unbalance Factor (θ CVUF) and positive sequence voltage (V 1). The influence of each parameter in both module and angle of CCUF (CUF and θ CCUF), and the Torque Ripple Factor (TRF) have been analyzed on those 13060 points. Results show that only VUF and V 1 parameters have a big influence in CUF and TRF.

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