The application of Oerui inverter in the winding equipment of plastics and printing machinery

I. Abstract

This article describes the application of speed sensor vector inverters for Eurore Drive as an alternative to torque motors for plastic machinery and printing machinery rewinding equipment. Due to its wide range of speed/torque settings and smoother running characteristics, it has become increasingly popular. The more it is used for plastic packaging and printing companies.

(1) Torque Motor Overview

Torque motor is a kind of special motor with soft mechanical characteristics and wide speed range. Torque motors include: DC torque motors, AC torque motors, and brushless DC torque motors.

(2) Construction principle of torque motor

When the load increases, the speed of the motor can be automatically reduced, and the output torque is increased to maintain balance with the load. The torque motor has a high locked-rotor torque and a small locked-rotor current, and can withstand stalled operation for a certain period of time. Due to the high electrical height and loss of the rotor, the heat generated is also large, especially at low speed operation and stalling. Therefore, the motor is equipped with an independent axial flow or centrifugal fan on the rear end cover (small output torque) Except for 100 frame size and below, for forced ventilation and cooling, the torque motor is equipped with thyristor control device, which can adjust pressure and speed, the speed range can reach 1:4, and the speed change rate is ≤10%. The characteristics of this series of motors make them suitable for winding, uncoiling, blocking and speed adjustment and other applications. They are widely used in the textile, wire and cable, metal processing, paper, rubber, plastics and printing machinery and other industrial fields.

(3) Main Features of Torque Motor

Torque motor is characterized by a soft mechanical characteristics, can be blocked. When the load torque increases, it can automatically reduce the speed, while increasing the output torque. When the load torque is a certain value to change the motor terminal voltage can be speed But the adjustment rate of speed is not good! So add a speed measuring device on the motor shaft, coupled with the controller. Use the output voltage of the speed measuring device and the voltage given by the controller to automatically adjust the motor terminal voltage. stable!

With features such as low speed, high torque, high overload capacity, fast response, excellent linearity of characteristics, and small torque ripple, it can directly drive the load to eliminate the transmission gear, thus improving the running accuracy of the system. In order to obtain different performance indicators, the motor has three different air gaps, medium air gaps, and three different air gaps. The small air gap structure can meet the general accuracy requirements. The advantages are lower cost; the air gap structure increases due to air gap. Eliminates cogging, reduces torque ripple, virtually eliminates non-linear changes in magnetoresistance, motor linearity is better, electromagnetic air gap is increased, armature inductance is small, electrical time constant is small, but manufacturing costs are high Medium air gap structure, its performance index is slightly lower than the air gap structure of the motor, but is much higher than the small air gap structure of the motor, and the volume is smaller than the air gap structure of the motor, the manufacturing cost is lower than the air gap structure of the motor.

(4) Torque motor application

In the industries of machinery manufacturing, textiles, papermaking, rubber, plastics, metal wire and wire and cable, it is necessary to wind the product on a reel (disc). The diameter of the winding is larger from the beginning to the end. In order to keep the tension of the rolled material uniform (that is, the linear speed is constant), the winding speed is required to be smaller and the winding force is increased. Application characteristics Winding, unwinding (brake constant power characteristics), stepless speed regulation, etc.

1, winding

In the processing of wire and cable, textile, metal processing, and papermaking, winding is a very important process. When the product is wound, the diameter of the roll gradually increases, and it is very important to maintain the tension of the rolled product throughout the entire process. Because the tension exceeds the assembly, the diameter of the wire rod is thinned or even broken, or the thickness of the product is uneven. If the tension is too small, the winding can be loosened. In order to maintain the tension during the winding process, the output torque of the motor driving the winding drum must be increased as the diameter of the product wound onto the reel increases, and at the same time, in order to maintain the linear speed of the winding product, The speed of the reel must be reduced accordingly, and the mechanical characteristics of the torque motor can exactly meet this requirement.

2. Unwinding (brake constant power characteristics)

Unwinding is also known as loosening, unwinding, unwinding, etc. In industrial production, it is sometimes necessary to transport the product wound on the drum to the next process. In the transportation process, it is required to apply a tension opposite to the driving direction to the product, and at the same time, it is required to keep the linear speed and the reverse tension of the product transmission constant along with the change of the cylinder diameter, which requires the motor to have a constant braking power characteristic.

3, stepless speed regulation

The mechanical characteristics of the torque motor can achieve higher stiffness under the control of a modern servo drive device and therefore can replace the original mechanical transmission device to achieve direct drive. At present, there are numerically-controlled rotary tables and numerically-controlled oscillating-angle milling heads that use a torque motor as a core power element. These products are not as good as the mechanical transmission in terms of volume-to-power ratio, but they have begun to promote their use in precision equipment due to their lack of transmission clearance, wear, transmission accuracy and high efficiency.

4, blocked

In some special occasions, the motor is sometimes required to maintain a static moment for a period of time, such as the cable winding must be kept at the initial stage of tension; forging clamping devices for large forging presses. Because the impedance of the torque motor is large, its stalling current is small, and forced air is used at the same time, it can meet the requirements for stalling within a certain period of time. The allowable stall time should be according to the calibration value on the nameplate. If a longer stall time is required, a larger torque motor can be selected to reduce the terminal voltage of the torque motor.

5, other

Torque motor can also be flexibly used according to its various characteristics, such as its own DC series motor characteristics, can be used in part to replace the DC motor; and if the rotor has a high resistance characteristics, starting (blocking) torque, it can be applied In the open and close gate (valve) door and dragging system with large resistance torque, it can also be used to start (locked) torque, start (blocking) current is small, the mechanical strength of the solid rotor is high, and use For frequent positive and negative reversal devices or other similar actions on various machines.

Second, the F3000 instead of the torque motor configuration

1 F3000 series inverter

2 variable frequency vector motor

3 rotary encoder

Third, the inverter parameter settings and wiring

In the actual working process, the most commonly used is only the use of analog adjustment to control the torque size, and the speed limit control using a fixed value, not less than the maximum operating frequency required by the equipment.

Fourth, F3000 inverter drive frequency vector motor work process

After replacing the torque motor with the F3000 frequency converter and variable frequency motor, it can completely achieve the function of the torque motor:

1 When no-load is switched on, the torque of the motor is adjusted by adjusting the torque control potentiometer. Usually the customer has an experience value. At this time, the motor speed will rise to the set speed limit.

2 When the tape starts to wind up, the speed of the winding motor will decrease due to loading. When the tension of the plastic film from the traction point to the take-up reel reaches the torque adjusted by the motor, the speed will remain unchanged and continue to wind. If the speed is faster, then the tension in this section of the membrane will be reduced, which is less than the current torque of the motor. Then the speed of the inverter will be accelerated until it is consistent. vice versa.

3 If the traction motor stops working, the winding motor will also stop due to the excessive tension in the membrane. The frequency of the inverter will drop to zero while maintaining the existing torque so that the membrane does not relax. Once the traction motor starts working, the winding motor will accelerate and decelerate.

V. Conclusion

The use of Oerlikon inverter instead of torque motor realizes the constant tension retracting and unwinding function, which has superior torque characteristics, and greatly improves the reliability of the equipment, overcomes the heating condition of the motor, saves the electric energy, and can also reduce the motor failure. . Therefore, more and more customers began to use the inverter to replace the torque motor to achieve horizontal tension control.

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