Energy efficiency improvements in electric drives with centrifugal load
Mihail Digalovski, Goran Rafajlovski, Krste Najdenkoski
Electric drives with centrifugal torque characteristic are a typical low efficiency drives. These include fans, pumps, blowers etc. In these electric drives, there is great technical and economic potential for significant energy savings. Pumps are the most numerous working machines, therefore the electric drives with pump will be considered in this paper. First, as opportunity to increase energy efficiency will be presented the replacement of existing electric motors in these drives with highly efficient motors – HEM. Will be made an analysis how much is savings due to reduced losses in highly efficient electric motors. The next, will be given a brief introduction to pump systems and then will be presented the ways in which the operating point of the pump can be regulated. In addition, is presented a calculation for energy savings was made a comparison between conventional ways of regulating the operating point of the pump and regulation of the operating point through variable electric drive speed. It analyzes the electricity consumption of low, medium and high-power pumps driven by induction motors that have the ability to regulate the rotation speed through an inverter with U/f regulation.
Cite this article as:
Digalovski M., Rafajlovski G., Najdenkoski K. Energy efficiency improvements in electric drives with centrifugal load. Electrotechnica & Electronica (Е+Е), Vol. 57 (9-12), 2022, pp.79-86, ISSN: 0861-4717 (Print), 2603-5421 (Online)