IJERT-Performance Investigation of Three Phase Induction Motor's Rotor under Unbalanced Positive Sequence Voltage through Simulations (original) (raw)
2013, International Journal of Engineering Research and Technology (IJERT)
https://www.ijert.org/performance-investigation-of-three-phase-induction-motors-rotor-under-unbalanced-positive-sequence-voltage-through-simulations https://www.ijert.org/research/performance-investigation-of-three-phase-induction-motors-rotor-under-unbalanced-positive-sequence-voltage-through-simulations-IJERTV2IS90681.pdf The greatest potential for energy savings is in electric motor applications and induction motors constitute over 60% of such usage. A significant amount of investment on low losses motor materials and drives could be made in order to achieve energy efficiency, but many a times it has been found that performance variations of electric motors are mainly due to external factors, in particular, the quality of the incoming supply. Therefore, when it comes to identifying energy efficiency opportunities, it is essential to study the influence of voltage variations on electric motors. This work investigated the impact of positive sequence rated voltage, under voltage and over voltage unbalance on induction motor's rotor operational performance using the International Electrotechnical Commission's (IEC) definition of voltage unbalance. MATLAB ® Simulink was used to build a model for the performance analysis of a 2h.p induction motor and operated under balance and unbalance voltages at no load and various loaded condition using IEC's definition of voltage unbalance. The results obtained indicated gross rotor inefficiency when the motor operated under various unbalanced conditions of rated voltage, under voltage and over voltage. The worst adverse effect of unbalance was most severe at under voltage conditions; drastic load reduction did not produce good motor performance even with a low Voltage Unbalance Factor (VUF). At over voltage unbalance however, motor's rotor indicated fair performance at VUF of 2-4% with a load reduction of 50%. At rated voltage unbalance with VUF of 2-4%, good performance was observed on load reduction of 50%. Above VUF of 4% for all types of unbalance, motor's rotor operation became grossly inefficient and load reduction did not improve the operational performance of the induction motor's rotor.
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