Application of Sunwoele Textile Special VFD (Variable-frequency Drive)

I. Introduction

With the advent of the new century, China has added nearly 10 million spindles of spinning production capacity each year, and now has more than 60 million spindles of short-fiber spinning capacity and more than 4 million spindles of long-fiber spinning capacity, and has more than 100,000 textile and garment industries. The production enterprise is the largest textile country in the world. In recent years, it produces about 20,000 spinning frames, 5,000 roving frames, 100,000 looms and various supporting equipment every year. It can be seen that China is also a big country producing textile machinery. In the new century, China will develop from a big textile country to a powerful textile country. Textile machinery, which is the basis of textile industry technology and equipment, will undergo qualitative changes. From a large textile country to a textile machinery power, we will vigorously develop textile machinery products with high efficiency, energy saving, environmental protection, and high-level automation technology. This is a relatively long-term project. It is a arduous task. In order to achieve this ambitious goal, improving the level of textile machinery automation technology is one of the most important key technologies. China's textile machinery production is facing more intense competition, prompting the development of textile machinery and textile machinery automation technology to present new features, such as frequency conversion speed regulation technology, motion control technology, programmable control technology, network technology, etc., which have been promoted on textile machinery application. Now mainly introduce the application characteristics of textile machinery to frequency conversion speed regulation technology. (The main features are expounded on the triangular wave speed regulation)

2. Triangular wave speed regulation

In order to meet the requirements of good yarn winding and forming without overlapping and sagging, the spinning winder is composed of friction rollers, grooved drum traversing devices and bobbin chucks, etc., and the motor speed of the grooved drum traversing device must be adjusted according to The triangular wave law shown in Figure 2 is adjusted. The figure is marked with the output frequency of VFD (Variable-frequency Drive). This kind of speed regulation law is usually adjusted by the VFD (Variable-frequency Drive) built-in swing frequency function to adjust the output frequency. to achieve.

When the VFD (Variable-frequency Drive) drives the traverse motor to reach the upper limit frequency f1 or the lower limit frequency f2, the frequency should change abruptly, falling to or rising. The amplitude of the sudden change frequency is generally about 1% of the basic frequency F1. The time of sudden change frequency, Theoretically the requirement is 0, but in practice, due to the inertia of the traverse device and the motor, it is impossible for the motor speed to change suddenly and there is a transition time, the transition time is usually above 0.1S

Three parameter settings

Function number, function name, setting value, function number, function name, setting value E-01 Running command given channel 1F-24 Wobble frequency rise time 10E-02 Frequency given main channel 11F-25 Wobble frequency fall time 10E-13 Acceleration time

10H-65 swing frequency jump (difference frequency) 3E-14 deceleration time

10E-09 Maximum frequency

>F-09