How Low-efficiency Motors Face Energy Saving

- Oct 26, 2018-

Since July 1, 2011, the sale of Class 3 energy efficient motors is prohibited. The implementation of the mandatory standard “Energy Efficiency Limit Value and Energy Conservation Evaluation for Small and Medium-Sized Three-Phase Asynchronous Motors” issued by the National Standardization Administration in 2006 indicates that the energy-saving motor will replace the traditional low-efficiency motor in the future. For low-efficiency motors, this It seems to mean a complete exit.

But in fact, China's current high-efficiency motor market accounts for only 10% to 15% of the total market, and 90% of these high-efficiency motors are used for export; although the energy efficiency standards for motors produced and sold after July 1, 2011 have been made. Mandatory standards, but inefficient motors that are already in use are still dominant in the future.

Since it will not exit quickly, there is no doubt that the energy-saving requirements for low-efficiency motors are resistant. How do low-efficiency motors cope with energy-saving challenges in the face of high-efficiency energy-saving requirements? The national remanufacturing demonstration project for the country's first remanufacturing demonstration project was launched in Shanghai on October 25, which is an effective way to solve this problem.

Energy saving potential should not be underestimated

According to statistics, there are about 100 million industrial electric motors, 25 million compressors and 30 million wind turbines and pumps in China. In 2010, the total installed capacity of various types of electric motors in China was about 1.2 billion kilowatts, and the annual power consumption was about 2.5 trillion kilowatts. At the time (calculated according to the average annual operation of 2000 hours), the electricity consumption of the motor accounts for a considerable proportion of the total electricity consumption in the country, and its electricity consumption accounts for about 66% of the industrial electricity consumption, accounting for the total electricity consumption in the country. About 50%.

Although there are many types of motor products in China, the overall efficiency is not high. According to Xiong Huawen, deputy director of the Energy Efficiency Center of the Energy Research Institute of the National Development and Reform Commission, the operating efficiency of China's motor systems is generally low and energy consumption is high, compared with the international advanced level. It should be 20%~30% lower.

At present, the electric motors used in China are mainly Y series motors and a considerable part of JQ2 series motors promoted in the 1980s, and their efficiency is 2~3 percentage points lower than that of Y2 series motors. In addition, the equipment such as blown fans and pumps are behind, resulting in an efficiency of 3 to 5 percentage points lower than that of developed countries.

At the same time, due to poor equipment reliability and poor design thinking, many users consider the safety factor to be large in the selection, generally taking 10%~15% margin, and the big horse-drawn car phenomenon is seriously low-load operation, causing great waste. Therefore, the industry generally believes that low-efficiency motors have a 50% energy saving potential, and industrial energy conservation must start with improving the efficiency of the motor.

Actively respond to energy saving challenges

The high-efficiency remanufacturing of electric motors involved in the national motor efficient remanufacturing demonstration project is to use the non-destructive, environmentally friendly and pollution-free dismantling methods to maximize the utilization and recovery of the original motor parts and replace the new windings, insulation, bearings and other components. Finally, transforming the inefficient old motor into a high-efficiency motor is an effective way to save resources and comprehensively use. It can prevent the old motor from flowing into the secondary market again from the source, and can reduce the cost of high-efficiency motor use.

According to Chen Weihua, secretary-general of the Small and Medium Motors Branch of China Electrical Equipment Industry Association, the reporter said that it is of great significance to reproduce the inefficient motor as a high-efficiency motor. If 10 million kilowatts is replaced with a general efficiency motor and remanufactured into a high-efficiency motor, it can save 3.7 billion kilowatt-hours per year (about 4.7% of total industrial electricity consumption), recycling 55,000 tons of cast iron parts, and silicon steel sheet 6.1. Ten thousand tons. Such a huge amount of reusable low-efficiency motors will not be replaced, and there will be a huge gap in the goal of completing energy conservation and emission reduction tasks by 2020.

Chen Weihua believes that in China, some motor system users lack understanding of the economic benefits brought by energy-saving of low-efficiency motor systems, or there are obstacles to the technical problems of energy-saving transformation of motor systems, and the lack of information platform sharing makes the motor system energy-saving. emphasized. In foreign countries, the implementation of low-efficiency motor improvements has already begun.

According to the reporter, from the 1990s, the United States began to start the motor improvement program. In recent years, Australia, Canada and other countries have generally tended to accelerate the replacement of various types of electric motors, innovating the traditional structure of electric motors, integrating devices with information processing and control functions with electric motors, and mechatronics products have become an inevitable trend in the development of electric motors. . Electric motors are increasingly moving toward high performance, high precision, large capacity, miniaturization, digitization and intelligence.

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