60-70% of my country\'s electricity generation is used to drive motors to do work, of which 90% are AC motors, most of which are directly driven at a constant speed, resulting in a waste of electricity. For example, fans and water pumps account for more than 30% of industrial electricity consumption (about 47 million units nationwide, with a total power of about 130 million kilowatts). Calculated at an average power saving of 20%, for the whole country, it is equivalent to saving 50 billion kWh of electricity per year, which is equivalent to the annual power generation of a 15 million KW power station.
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