2005-3-11 14:54:56

The frequency converter is mainly used for adjusting the speed of the AC motor (asynchronous motor or synchronous motor) and is the most ideal and most promising speed adjustment scheme for AC motors. In addition to excellent speed control performance, the frequency converter has significant The energy-saving effect is an ideal speed-regulating device for technological transformation and product replacement. Since it was introduced into China in the 1980s, frequency converters have gained rapid development and wide application as an increasingly important automation device in energy-saving applications and speed process control. In the power, textile and chemical fiber, building materials, petroleum, chemical, metallurgy, municipal, paper, food and beverage, tobacco and other industries and public works (central air-conditioning, water supply, water treatment, elevators, etc.), the inverter is playing an important role .
(1) Inverter and energy-saving The initial purpose of the inverter is speed control, but at present, more energy-saving is used in China. China is a big energy-consuming country, with low energy efficiency and insufficient energy reserves. In 2003, China's electricity consumption, 60-70% of the power, and in the total capacity of 580 million kilowatts of motor capacity, only less than 20 million kilowatts of the motor is with variable frequency control. The market research report analyzes that in China, there are at least 180 million kilowatts of electric motors with variable load and energy-saving potential. Therefore, the state vigorously promotes energy-saving measures and focuses on frequency conversion technology.
The application of variable frequency speed regulation can greatly improve the control accuracy of the motor speed, so that the motor runs at the most energy-saving speed. Take a fan pump as an example. According to the principle of fluid mechanics, the shaft power is proportional to the third power of the speed. When the required air volume is reduced and the fan speed is reduced, its power is reduced by the third power of the speed. Therefore, the precise speed saving effect is very impressive. Similarly, many variable load motors generally produce the motor's capacity according to the maximum demand, so the design margin is large. In actual operation, the proportion of light-load operation time is very high. Such as using frequency control, can greatly improve the efficiency of light-load operation. Therefore, there is a huge potential for energy savings from varying loads.
For energy-saving purposes, inverters are widely used in power, metallurgy, petroleum, chemical, municipal, central air conditioning, water treatment and other industries. Take the power industry as an example, due to the large area of ​​electricity shortage in China, the power investment will continue to increase. At the same time, the national electricity reform program puts forward requirements for the cost control of the power plant. The reduction of internal power consumption becomes the focus of the power plant, so the frequency converter has a power industry Great potential for development, especially high-voltage inverters and high-power inverters. Market research report shows that in the power industry alone, the inverter market size in 2003 reached 250 million yuan. Therefore, the energy-saving application of the inverter has a very broad prospect.
(2) Inverter and process control (speed control)
At present, China's equipment control level is relatively low compared with developed countries, and its manufacturing process and efficiency are not high. However, with China's accession to the WTO, both product quality and production efficiency need to face international competition. Therefore, it is crucial to increase the level of equipment control. Because frequency conversion speed regulation has the advantages of wide speed range, high speed accuracy, and good dynamic response, in many applications requiring precise speed control, the inverter is playing a significant role in improving process quality and production efficiency.
Take the textile industry as an example, China has the world's largest production capacity of textile products, with a global market and a large industrial scale. The textile and chemical fiber industry is also the industry with the most frequency converters and the highest density of use. In the most common chemical fiber machinery and equipment, the equipment used in the drive has a screw extruder, a spinning machine and a post-processing machine. The most popular cotton spinning equipment used in frequency converters are spinning machines, roving machines, and combing machines. These devices require precise speed control, multi-unit synchronous transmission or proportional synchronous (draft) transmission, etc. The application of frequency converters can improve process requirements and improve product quality, while reducing labor intensity and improving production efficiency. It can be said that The frequency converter is an important equipment for the textile industry to enhance its international competitiveness. Market surveys show that in 2003, the market size of inverters in the textile and chemical fiber industries exceeded 1 billion yuan.
In addition, in the food, beverage, packaging, paper, machine tools, elevators and other industries, domestic companies need to expand production scale, improve production technology, inverter application prospects and development potential can not be underestimated.
(3) Variable-frequency appliances In addition to industrial-related industries, in the average family, saving electricity bills, improving the performance of home appliances, and protecting the environment have received more and more attention, and inverter household appliances have become another broad market and application trend of inverters. Refrigerators, washing machines, and home air conditioners with variable frequency control have great advantages in terms of power saving, reducing voltage shock, reducing noise, and improving control accuracy. At present, China is the world's leading supplier of home appliances, but the proportion of household appliances using the inverter is very low, while in Japan, more than 90% of household appliances are variable frequency control. According to the survey, in 2003, China's inverter household appliances increased by more than 200% year-on-year, but inverter household appliances embodied in the market are rare. Therefore, inverter household appliances have very good development potential. ?
(4) The China inverter market with broad prospects China has a huge industrial cluster and maintains a continuous and stable development. In line with international standards, many companies need to improve their international competitiveness; and people's quality of life is constantly improving. These are the drivers for the growth of the inverter market and the basis for wider application.
In 2004, China's inverter market research report showed that China's inverter market has maintained a rapid growth of 12% to 20% in the past few years. In 2003, due to the rapid development of the industrial and construction industries and large investments in various industries, The year-on-year increase reached nearly 40%, and the market size exceeded RMB 5.5 billion. In 2004, due to the sudden increase in the market base in 2003, coupled with the country’s macro control of the metallurgy, building materials and other industries, the market growth rate of the inverter will drop significantly. However, due to the overall rapid development of China's economy and China’s accession to the WTO, the market’s demand for products will gradually increase. It is imperative to increase the level of production equipment, and inverters used for production process control will be increasingly used. On the one hand, China's power supply and demand are seriously out of balance, and the phenomenon of power supply and discharge at the peak season is widespread, and energy-saving calls are unprecedented. Therefore, in the next three years, China's inverter market will still maintain a rapid growth of around 10%. The market research report believes that China's inverter market can be saturated and mature after at least 10 years. Therefore, China's inverter market has a broad space for development.

Contact: Huang Jiansong Mitsubishi Inverter