With the advent of the new century, China has an annual increase of nearly 10 million spindles of spinning capacity. Now it has more than 60 million spindles of staple fiber spinning capacity and 4 million spindles of long fiber spinning capacity. It has more than 100000 textile and clothing production enterprises, and is the largest textile country in the world. In recent years, it has produced about 20000 spinning frames, 5000 roving frames, 100000 weaving machines and various supporting equipment. It can be seen that China is also a big textile machinery producer. In the new century, China will develop from a textile power to a textile power. Textile machinery, as the basis of the technology and equipment of textile industry, will present qualitative changes. Developing from a big textile country to a powerful textile machinery country, we will vigorously develop textile machinery products with energy-saving, environmental protection and high-level automation technology. This is a long-term and arduous task to achieve this grand goal.

It is one of the key technologies to improve the automation technology of textile machinery. China's textile machinery production is facing more fierce competition, which makes the development of textile machinery and its automation technology present new characteristics, such as frequency conversion speed regulation technology, motion control technology, programmable control technology, network technology, etc., which have been widely applied on textile machinery. This paper mainly introduces the application characteristics of variable frequency speed regulation technology in textile machinery. (it mainly describes the triangle wave speed regulation)

Triangle wave speed regulation
In order to meet the requirements of good yarn winding without overlapping and edge collapse, the spinning winding head is composed of friction roller, transverse motion device of groove drum and bobbin chuck, etc., and the triangle wave law of motor speed regulation of transverse motion device of groove drum is regulated by the output frequency of frequency converter, which is usually realized by adjusting the output frequency by built-in frequency swing function of frequency converter.

Communication function
The inverter is connected with the open bus and has RS485 communication port. When there are many frequency converters (for example, more than 10), long distance, more I / O interfaces between frequency converter and PLC, large wiring quantity, heavy installation and maintenance workload and high cost, it is reasonable to adopt fieldbus control system, such as large polyester spinning post-processing combined machine, etc. Therefore, the inverter must be connected to the open field bus to run, stop, adjust frequency and modify the number. The frequency, current, voltage and other state signals of the frequency converter and the fault signals such as over-current, over frequency and under voltage can be monitored centrally. The network control of the frequency converter is mainly to connect multiple inverters to the upper computer through serial port, and the man-machine interface is used to realize the frequency conversion The operation, operation, condition monitoring and fault alarm of the device have become a technical development trend in the future.

Application cases
With the development of textile machinery, the requirements for the speed regulation performance of electrical drive are higher and higher, and the application of frequency converter speed regulation is more and more common. While meeting the process requirements, it can save energy for enterprises and reduce energy consumption, so as to adapt to the current environment of saving society and improve the product competition of enterprises
A chemical fiber Co., Ltd. of Suzhou City, Jiangsu Province, applied our textile special inverter to transform the textile equipment of the factory. After the technical transformation, the process controllability and product qualification rate were significantly improved, the production efficiency and energy utilization were improved, and considerable economic benefits were obtained