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Article
Electric Motor Efficiency under Variable Frequencies and Loads
Journal of Irrigation and Drainage Engineering
  • Charles M. Burt, California Polytechnic State University - San Luis Obispo
  • Xianshu Piao, California Polytechnic State University - San Luis Obispo
  • Franklin Gaudi, California Polytechnic State University - San Luis Obispo
  • Bryan Busch, California Polytechnic State University - San Luis Obispo
  • N. F. N. Taufik, California Polytechnic State University - San Luis Obispo
Publication Date
3-1-2008
Abstract

This paper details a study performed by the Irrigation Training and Research Center to determine motor performances under varying speeds [induced by a variable frequency drives (VFD) controller] and loads. A further goal of the study was to provide sufficient information to designers so that they could estimate total pumping plant power usage with a VFD-controlled installation. Motors were tested with a VFD as well as across-the-line. On average, the relative efficiency of the electrical system with a VFD may be approximately 8% lower than the relative efficiency of a properly designed, full-load across-the-line system. If one considers actual field operating conditions this 8% is misleading because overall energy savings can be obtained with VFDs due to their ability to properly adjust speeds to meet actual field conditions.

Citation Information
Charles M. Burt, Xianshu Piao, Franklin Gaudi, Bryan Busch, et al.. "Electric Motor Efficiency under Variable Frequencies and Loads" Journal of Irrigation and Drainage Engineering Vol. 134 Iss. 2 (2008) p. 129 - 136
Available at: http://works.bepress.com/cburt/1/