This paper deals with the reduction of electric energy consumption in induction motor drives by setting appropriately the supply voltage. The results of the research show dependencies of the induction motor input power and reactive load on voltage magnitude. For induction motors loaded from 50% to 70%, both reactive loads and power losses can be reduced by setting voltage within the range Un ± 5% on supply transformer. Calculation results and analysis indicate the possibility for significant electical energy savings in drives with partially loaded induction motors. Results and analysis are given separately for small, medium and large motor powers. These results have been confirmed in two implemented projects.
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