In China's textile industry, there are many varieties of equipment and complex structures, and many textile machines need speed regulation from the process. In the textile machinery, the constant line speed regulation of the fabric has experienced several forms of speed regulation, such as pure mechanical differential mechanism speed regulation, hydraulic motor speed regulation, wound rotor asynchronous motor and DC motor.

In recent years, with the continuous improvement of the level of mechatronics of textile machinery, in order to improve production efficiency, improve product quality and reduce energy consumption, inverter as a way to improve the process and energy-saving transmission since the early 1990s batch into the textile industry, has been rapid growth. Especially since joining the WTO, the market for textiles has expanded, but competition has become more intense, for which manufacturers are committed to new equipment research and development to improve product competitiveness. The demand for inverters in the textile industry is growing and the requirements are increasing. It is the duty and mission of inverter suppliers to actively understand the textile industry, thoroughly study the demand of textile machinery for inverter, and provide the textile industry with applicable inverter products and solutions for inverter speed control transmission.

Textile machinery classification

Chemical fiber machinery, cotton textile machinery, knitting machinery, nonwoven machinery, printing, dyeing and finishing machinery

1. Requirements of textile machinery for inverter
   
2. Spinning machinery is responsible for removing, loosening and drawing cotton, wool, hemp, silk and chemical fiber materials into uniform and flexible yarn.
   
3. The starting process requires a smooth, inverter start frequency setting as low as possible.
   
4. The braking process is required to be fast and smooth.
   
5. Programmable multi-segment speed output.
   
6. The multi-motor cascade operation requires speed synchronization.
   
7. In order to wind the yarn evenly on the spindle, the frequency swing is required, i.e. the triangle wave frequency output for textile.
   
8. with self-adjusting leveling control system, for high speed or high performance parallel machine requires vector closed loop control frequency converter or servo drive system. 
   

Weaving machines are responsible for processing fiber yarns into cloth, threads or knitted products. Winding, warping and sizing are the preparatory processes before weaving.

1. Single spindle winders, knitting machines and warping machines require automatic stopping for faults and fixed length (or when the shaft is full).
   
2. winding, drawing-in and twisting machines require frequency converters with oscillating frequency function.
   
3. smooth start and fast braking.
   
4. Sizing machine requires large speed range, constant tension and multi-motor synchronous speed control.
   

Dyeing and finishing machinery is cloth and yarn after processing equipment. According to the process requirements can be divided into refining and bleaching, dyeing, printing, finishing and other processes, in each process, according to the different requirements of the processing fabric, and a number of unit operations. Among them, refining and bleaching include blank preparation - burning - desizing - cooking and refining - bleaching - mercerizing - heat setting and other processes. 

1. Intermittent dyeing machine requires wide range of speed regulation, tension winding control, fast forward and reverse rotation.
   
2. Printing machine requires wide range of speed regulation, smooth and fast starting and braking, and high accuracy of flower positioning (positioning drive mostly adopts servo system).
   
3. Washing machine load inertia, requiring frequency converter fast braking.
   
4. Finishing line of multi-motor drive requires high speed synchronization accuracy, tension control.
   
5. Some occasions require the inverter to take a common DC bus scheme to save the braking resistor as well as energy loss.
   

Chemical fiber machinery includes spinning machine, post-treatment line, elastic yarn machine, nonwoven production line, etc.

1. Power range: 0.75-280kW, with public rectifiers up to 800kW.
   
2. Requirement for a common DC busbar solution.
   
3. spinning machines are driven by permanent magnet synchronous machines to ensure high precision synchronization of speed at each drive point.
   
4. the draft motor is required to keep the tension of the chemical fiber yarn constant both when running and stopping, and the frequency converter should have zero servo function and tension winding control function.
   
5. the upper and lower double-roller separately driven hot rolling mill requires load balancing control function.
   

Zhufeng inverter solution

Everest Electric high-performance, multi-functional, ZF3000 series high-performance vector inverter, in the textile industry has a wide range of applications, the following discussion of the Zhufeng inverter solutions according to the speed control transmission characteristics of textile machinery respectively.

1. Require reliable operation in the dusty and humid working environment of textile and dyeing workshop

All Everest inverters have been improved in structural design, the air duct of module radiator is isolated from the control board, and the control board and devices are implemented with special dustproof and moisture-proof measures, so the reliability is greatly improved.

2. Require reliable operation under the condition of poor quality of grid side 

For China's power grid voltage fluctuation, Everest inverter has the feature of wide voltage working range, which can work normally in the voltage range of 304V-456V; when there is instantaneous power failure in the power grid, Everest inverter has the function of "instantaneous stop and no stop", which can use the load inertia energy to keep the inverter running for a period of time.

3. The equipment of steel cleaning and dyeing line is multi-motor cascade operation, which requires speed synchronization. 

ZF3000 has various ways of speed cascade synchronization, analog input and output, (ZF3000) pulse input and output and field bus communication. The frequency setting has rich arithmetic and auxiliary quantity compensation function, which can meet the choice of different users and different usage requirements.

4. Most of the textile equipments such as carding, roving and spinning require smooth starting and fast braking. 

Everest inverter has S-shaped acceleration and deceleration curve function, ZF3000 series can run at low frequency to below 0.5Hz and still provide rated torque, which can ensure smooth start of machinery; energy braking and DC braking through braking resistor can easily realize fast and smooth braking.

5. Spinning machinery requires multi-speed operation 

Everest inverter has built-in 16 preset frequencies to be given, which can be switched through external terminal control.

6. Roving, spinning, rotor spinning and winding machines require swing frequency output in order to wind the yarn evenly on the spindle 

The center frequency and the shape of the triangle wave can be set individually, and it can also be used with the internal PLC function or the closed loop control function. 

Zhufeng inverter solution features

China's textile industry is booming and the speed of technological progress and renewal of spinning machine equipment will become faster and faster. As a supporting part of spinning machine equipment, frequency converter will play an increasingly important role in improving the performance of spinning machine, improving textile technology and saving energy. Facing the huge, fast-growing and rapidly changing market of inverter demand, Everest Electric will continue to work closely with spinning machine factories and textile mills to explore the latest demand for inverters in the textile industry and develop new products in time to provide better and more applicable inverters for the textile industry.

1、It can make the ordinary asynchronous motor realize stepless speed regulation.

2、Low starting current, reduce the capacity of power supply equipment.

3、Starting smoothly, eliminating the impact of machinery, protecting mechanical equipment.

4、The motor has a protective function, reducing the maintenance cost of the motor.

5、Have a significant power saving effect.