Efficient motors take measures from design, materials， and processes, such as reasonable positioning, rotor slot number, fan parameters， and sinusoidal windings to reduce losses, and efficiency can be increased by 2% - 8%, an average increase of 4%. In 2002, China's total motor capacity was about 400 GW, of which nearly 80% were small and medium-sized, with annual electricity consumption of 660 TW·h. The average efficiency of small and medium-sized motors is 87%, and the international advanced level is 92%. Thus, the power-saving potential of China's small and medium-sized motors is about 12TW·h.
From energy conservation and environmental protection, high-efficiency motors are the current international development trend, and the United States, Canada, and Europe have successively promulgated relevant regulations. In Europe, according to the running time of the motor, the CEMEP standard is divided into three levels: eff1 (highest), eff2, and eff3 (lowest), which are implemented step by step from 2003 to 2006. The newly introduced IEC 60034-30 standard classifies motor efficiency into four levels: IE1 (corresponding to eff2), IE2 (corresponding to eff1), IE3, and IE4 (highest). China is committed to implementing IE2 and above standards from July 1, 2011.
With China's accession to the WTO, the international society's enormous competitive pressures and challenges facing China's motor industry are increasing. From the perspective of international and domestic development trends, it is necessary to promote China's high-efficiency electric motors. This is also a requirement for product development, which will enable China's electric motor products to keep up with international development trends, and at the same time, help promote technological advancement and product export needs in the industry. According to statistics, in 2002, China's motor power consumption accounted for more than 60% of the national electricity consumption, of which small three-phase asynchronous motor consumes about 35% of electricity, which is a major consumer of electricity, so the development of high-efficiency electric motors in China is an important measure to improve energy efficiency. Therefore, one is in line with the needs of China's development and is very necessary.
At present, China's industrial energy consumption accounts for about 70% of the total energy consumption, of which motor energy consumption accounts for 60% to 70% of industrial energy consumption. In addition to non-industrial motor energy consumption, the actual energy consumption of the motor accounts for about 50% of the total energy consumption—the above. Today, the proportion of high-efficiency energy-saving motors is low. According to the national small and medium-sized motor quality supervision and inspection center, a sample survey of 198 sets of domestic key enterprises, the proportion of high-efficiency energy-saving motors reaching level 2 or above is only 8%. This has caused a great waste of the entire social resources.
Some organizations have calculated that if all the motor efficiency is increased by 5%, the annual energy savings will reach 76.5 billion kWh, which is close to the annual power generation of the Three Gorges in 2008. Therefore, the energy-saving motor industry has a large development space and strong demand. In terms of policies, the National Standardization Administration issued the mandatory standard “GB 18613-2012 Energy Efficiency Limit Value and Energy Efficiency Rating for Small and Medium-Sized Three-Phase Asynchronous Motors” in 2012.
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