Comprehensive Modeling of Induction Motor Imbalance Condition to ‎Precise Assessment of Steady State Performance Based on Complex ‎Current Unbalance Factor

After a comprehensive study of voltage unbalance issue, this ‎paper presents the defects of some unbalance factors and ‎concentrates on the importance of considering the angle of ‎complex voltage unbalance factor (CVUF) in order to ‎unbalanced condition assessment. Then, for the sake of precise ‎analyzing of the steady state performance of the induction ‎motor (IM) under unbalanced condition, the paper concentrates ‎on the complex current unbalance factor (CCUF) that consists of ‎complex voltage unbalance factor and impedance unbalance ‎factor (IUF). Therefore, the method considers the effects of ‎induction motor parameters as well. Because, the induction ‎machine parameters affect the performance of the induction ‎motor under unbalanced condition, complex current unbalance ‎factor gives a precise estimation of the electromagnetic torque ‎and the output power of the motor. In this paper, the ‎improvement of the steady state performance of an induction ‎motor under unbalanced condition by coupling small sized ‎induction motors instead of a large one is proved.‎