Efficiency electric motors

Variable-speed fan drives permit conditioned air distribution to be matched more closely to a building s needs. High-efficiency electric motors are used to drive the fans, saving as much as half the energy once used. Both variable-speed and high- efficiency motors are being applied even in residential air conditioning systems. 

Energy Efficiency Electrical Motors, Arthur D. Little, Inc., Federal Energy Administration, Washington, DC. DOE/CS-0163, May 1980. 

Sum of heat capacities of cold streams Sum of heat capacities of hot streams Efficiency, electric motors Polytropic efficiency, compressors and turbines Force... 

In addition to the above, NEMA designates a special class of Premium Efficiency Electric Motors (2003) for three-phase induction motors applied to municipal or industrial applications for operation on voltages of 600 V or less, rated 500 HP or less, operating more than 2000 hr/yr at more than 75% of full load. For details, please refer to NEMA MG 1-1998 Table 12-12. For each HP rating, that table defines nominal and minimum efficiencies for 2-, 4-, and 6-pole open motors. 

One or more full TIVM compressor/expander prototypes will be fabricated by Mechanology and tested across the full operating range. Modifications will be made as necessary to optimize performance. Subsequently, a high efficiency electric motor will be integrated with the TIVM to form a complete compressor/expander/motor (CEM) component. 

It could be noted that the best solution both from an environmental and economic perspective is the installation of high-efficiency electric motors for spinning machines, also related to the most critical process. The second best solution, economically and environmentally, is the substitution of the neon lighting system with the LED technology (Figure 8.6). With the implementafion of these two options it is possible to save 35,403 kg of CO2 equivalent (3% of the emission deriving from the consumption of electric energy). 

Table 8.13 Technical parameters and costs of high-efficiency electric motors for spinning machines...

Andreas, J. C. Energy Efficient Electric Motors, 2d ed., Marcel Dekker, New York, 1992. 

Ceramic electromagnets are used in medical magnetic resonance imaging (MRI) machines and in high-efficiency electric motors and generators. 

Energy-Efficient Electric Motors Selection and Application, John C. Andreas... 

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