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ITRC Report No. R 06-004

Electric Motor Efficiency under Variable Frequencies and Loads

Sponsor: CSU/ARI, US Bureau of Reclamation, and California Energy Commission PIER
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The primary research objective of this study was to determine motor efficiencies under varying speeds (induced by a VFD controller) and loads.  A broader objective was to provide sufficient information to designers and economists so that they could estimate total pumping plant power usage with a VFD-controlled installation.  Motors were tested with VFDs as well as across-the-line.


Center.  2006.  Electric Motor Efficiency under Variable Frequencies and Loads.  ITRC, California Polytechnic State University, San Luis Obispo, California, USA. ITRC Report No. R 06-004. 65 pp.

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