Electric Motor Efficiency under Variable Frequencies and Loads
http://www.itrc.org/reports/vfd/r06004
ITRC Report No. R 06-004
Electric Motor Efficiency
under Variable Frequencies and Loads
October 2006
Prepared for
California State University Agricultural
Research Initiative
California Energy Commission Public
Interest Electric Research
United States Dept. of Interior
Bureau of Reclamation
by
Dr. Charles Burt, Dr. Xianshu Piao, Franklin Gaudi, Bryan Busch, and Dr. NFN Taufik
Irrigation Training and Research Center (ITRC)
California Polytechnic State University (Cal Poly)
San Luis Obispo, CA 93407-0253
805-756-2379
www.itrc.org
Electric Motor Efficiency under Variable Frequencies and Loads
http://www.itrc.org/reports/vfd/r06004
ITRC Report No. R 06-004
Irrigation Training and Research Center
- i -
Electric Motor Efficiency
under Variable Speeds and Loads
TABLE OF CONTENTS
Introduction....................................................................................................................... 1
Background..................................................................................................................... 1
Procedures and Methods.................................................................................................. 5
Motor Testing Configuration .......................................................................................... 5
Electrical supply.......................................................................................................... 5
Motor test stand........................................................................................................... 6
Motors ......................................................................................................................... 7
Measurements ............................................................................................................. 7
RPM..........................................................