By Gilbert A. McCoy
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Extra resources for Energy efficient electric motor selection handbook
June 1983. 7. Bonnett, Austin H. S. Electrical Motors. Letter to Gilbert McCoy of WSEO. February 7, 1990. 8. National Electrical Manufacturers Association. Publication MG1, News Release. March 1989. 9. Keinz, John R. L. Hotulton. ” IEEE Conference Record CH1459-5, Paper No. PCI-80-8 1980. 10. Bonnett, Austin H. S. Electrical Motors, A Presentation to the Washington State Energy Office. April 1990. 11. Montgomery, David C. How to Specify and Evaluate Energy-Efficient Motors. General Electric Company.
Open Drip-Proof (ODP). An open motor in which ventilation openings prevent liquid or solids from entering the machine at any angle less than 15 degrees from the vertical. Guarded. An open motor in which all ventilating openings are limited to specified size and shape. This protects fingers or rods from accidental contact with rotating or electrical parts. Splash-Proof. An open motor in which ventilation openings prevent liquid or solids from entering the machine at any angle less than 100 degrees from the vertical.
2 is the European motor test standard. • JEC 37 is the Japanese motor test standard. 12. Do energy-efficient motors maintain the same percentage edge over standard motors when the load range drops from full load? Yes. Most manufacturers are designing their energy-efficient motors to provide peak efficiency at 75 percent to 100 percent load. As shown in Figures 11 and 17, efficiency stays fairly constant from full down to 50 percent load, but the power factor drops significantly. 13. How reliable are energy-efficient motors?