WHY MORE EFFICIENT MOTORS? (Electric Motor)

2.2
The escalation in the cost of electric power that began in 1972 made it increasingly expensive to use inefficient electric motors. From 1972 through 1979, electric power rates increased at an average annual rate of 11.5%/yr. From 1979 to the present, the electric power rates have continued to increase at an average annual rate of 6%/yr. The annual electric power cost to operate a 10-hp motor 4000 hr/yr increased from $850 in 1972 to $1950 in 1980 and to over $2500 by 1989. By 1974, electric motor manufacturers were looking for methods to improve three-phase induction motor efficiencies to values above those shown for standard NEMA design B motors in
Table 2.1.

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