2 - >用于电机和齿轮的国际效率（IE）标准是什么？

According to the U.S. Department of Energy (DOE), electric motors are responsible for half the energy use in the U.S. manufacturing sector, and the International Energy Agency (IEA) estimates that electric motor-driven system account for more than 40 percent of global electricity consumption. To promote energy savings, increase efficiency, and reduce operating costs for manufacturing operations, many countries and regions around the world have established minimum efficiency performance standards (MEPS) for motors used in industrial, commercial, and residential applications.