Worldwide, pumping systems account for nearly 20 percent of the energy used by electric motors and 25 to 50 percent of the total electrical energy used by certain industrial facilities. Significant opportunities to reduce pumping-system energy consumption exist, the most popular being through the application of variable-frequency drives (VFDs).1 This article will explain why VFDs and their cousins—electronically commutated motors (ECMs)—are a valid and cost-effective means of ...

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