Application of AC310 in extruder modification

In recent years, with the development of informatization of electronic equipment, there has been an increasing demand for processing various heat-sensitive polymers as physical transmission media. Such as PVC cable, PE silane, peroxide cross-linked cable, PE cross-linked shielded cable, etc. The key to the production of these polymers is the extruder. The extruder is constantly evolving with the increasingly high time-sensitive production requirements, from the previous DC motor to the inverter with the asynchronous motor, and then to the rare earth permanent magnet synchronization

The composition of screw extruder

Extrusion equipment is usually composed of the main machine, an auxiliary machine, and a control system. The extrusion system is mainly composed of screw and barrel, which is the key part of the extruder. The function of the transmission system is to drive the screw, which must ensure that the screw has the required torque and speed during the working process; the heating and cooling system mainly ensures the temperature control of the material and the extrusion system in the molding process. The composition of the auxiliary machinery of the extrusion equipment depends on the type of product. The main function of the control system is to control the speed of the main drive device, display its speed and current, and control the temperature.

The shortcomings of current motor and asynchronous motor drive screw

DC motor and asynchronous motor drive screw have the following shortcomings:

1. When the asynchronous machine and the DC motor drive the screw, the extrusion pressure is unstable due to the pulsation of the speed, and the plasticization effect is poor.
2. The carbon brushes of DC motors must be replaced every quarter, which increases maintenance costs. In a dusty or corrosive environment, the DC motor commutator will generate sparks, which is a safety hazard. It may cause abnormal operation.
3. After the asynchronous motor accelerates and reduces the box, the noise is large, the efficiency is low, and the maintenance cost is high.
4. Larger power asynchronous motors or DC motors are larger in size than synchronous motors, and installation on site is not convenient.

Principle and advantages of rare earth permanent magnet synchronous machine

The emergence and development of synchronous motors have made a considerable contribution to the abundance of power resources in our country. Compared with asynchronous motors, they have obvious technical and economic benefits and have the following advantages:

Advantages of using AC310 series

The AC310 series inverter is a product continuously developed on the latest high-performance vector technology platform of VEICHI. It not only adopts the international leading field-oriented vector control technology to be compatible with synchronous and asynchronous motor control but also has the advantages of under the premise, rationally arrange the parts and realize the book-style narrow body design.

1. The software adopts the international leading vector control algorithm, with precise electromagnetic decoupling, its starting is gentle, the starting torque is large, its 0.5HZ without PG vector control can reach 150% starting torque, and the PG vector control can reach 200% starting Torque. The reducer can be omitted for direct drive, avoiding the influence of the mechanical gap or mechanical elastic deformation of the mechanical transmission link, and improving the control accuracy of the system.
2. It has a wealth of extended functions. The AC310 series is equipped with 485 communication as standard, and you can choose to add a CAN card to realize CAN bus communication. Additional PG card can realize closed-loop control, additional IO card can expand input and output terminals, an additional DP card can realize PROFIBUS-DP communication, etc. Different choices can be made according to site requirements.
3. High operating efficiency and more energy saving. The efficiency and power factor of the asynchronous machine in the low power section are relatively low, and the synchronous machine can maintain high efficiency and power factor in the entire power section. Compared with the traditional system, efficiency is increased by 20%-60%, and the energy-saving is obvious.
4. The direct drive system without the reducer can better solve the vibration and noise at high speed. Compared with the previous main engine, the noise is reduced by 30 decibels.
5. The inverter is equipped with rich inverter and motor protection functions, which can ensure the safe and reliable operation of the entire equipment.

AC310 wiring and parameter debugging

Field wiring: 

Parameter settings

Set according to the parameters in the table, the motor parameter self-learning must be carried out, and it is recommended to disconnect the motor shaft for rotating self-learning.

Summary

Using AC310 series frequency converter to drive a synchronous motor used in the extruder not only saves electric energy, but more importantly, it improves the process, product quality, and product competitiveness. Based on the values of customer-centric and struggling-oriented, VEICHI keeps innovating and making progress, keeping up with the pace of the times, and constantly providing customers with the best electric drive solutions. In the future, VEICHI will work with you to move forward.