By Paul Waide, Conrad U. Brunner
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Extra info for Energy-Efficiency Policy Opportunities for Electric Motor-Driven Systems
100,0 1000,0 Energy‐efficiency policy opportunities for electric motor‐driven systems © OECD/IEA 2011 Table 21: Typical losses in an AC induction motor Typical losses in 4-pole motors Page | 48 Factors affecting these losses Stator losses 30 - 50% Stator conductor size and material Rotor losses 20 - 25% Rotor conductor size and material Core losses 20 - 25% Type and quantity of magnetic material Additional load losses 5 - 15% Primarily manufacturing and design methods Friction and windage 5 - 10% Selection/design of fan and bearings Abbreviation: AC = alternating‐current.
It also makes use of newly collected evidence and data for 2009 gathered through direct contacts with market actors in several countries. Electric energy consumption of the global stock of electric motors can be estimated from the bottom‐up by multiplying the electric power of the installed motor stock by the number of full‐ load hours per year. The electric power is determined from the installed mechanical output power divided by the nominal efficiency of the motors. Full‐load hours are decomposed by operation time and load factor.
Average load factors are almost the same among countries. Energy‐efficiency policy opportunities for electric motor‐driven systems © OECD/IEA 2011 Table 18: Estimated motor electricity demand with particular factors from the bottom‐up model for 13 countries with highest electricity consumption Annual Full load El. cons. op. time Load hours bottom-up 2 2 (h/a) factor (h/a) (TWh/a) Base Sales year (tsd. sales pieces) Base Stock National year (Million Avg. Pm Avg. 60 1 670 268 2007 1 282 3 Russia 3 Canada ca.