Frequency Vector Control In The Application Of Tension - Frequency, Vector Technology - Electrical

Abstract: This article from the application perspective of the current technical conditions

, the vector conversion technology in the take-up drive in the use and design of methods and ideas. Strong practical and theoretical guidance.

Key words: tension frequency vector torque coil diameter

Introduction: In industrial production in many industries will have to be precise tension control to maintain constant tension in order to improve the quality of products. Such as paper making, printing dyeing, packaging, Wire & Cable , Fiber-optic cable, textile, leather, metal foil processing, fiber, rubber, and metallurgical industries were widely applied. Inverter technology has not matured in the past, usually in DC control, to obtain good control performance. With inverter technology matures, there has been vector control Inverter , Tension control, frequency converter and some special high-performance converter. The control performance has been able to control the performance and dc comparable. Since the structure of AC motors, cost, use, maintain, and many other aspects than DC Motor , Vector inverter control is in these sectors are more and more widely used, there is a trend to replace DC controls.

Tension control wire or the purpose is to maintain constant tension on the strip, vector control frequency converter can achieve their goals in two ways: first, by controlling the motor speed achieved; the other is by controlling the motor output torque to achieve.

Tension speed closed-loop control mode Speed mode, closed loop tension control is by adjusting Saving Machine speed to achieve constant tension of. First of all, by the band (line) of the line speed and roll of paper trails to calculate real-time synchronization matching frequency command, and then through the tension of the tension detecting device feedback signals and constitutes a PID closed-loop tension settings, adjust the inverter frequency command.

Match the frequency of synchronous instruction following formula:

F = (Vpi) / ( D) Where: F matches the frequency of inverter synchronous speed instruction V materials, motor pole number p (inverter based motor parameters automatically) i mechanical transmission volume than the drum diameter D

Inverter brand different designers use different ways to get the above variables are also different, especially the material velocity (V) and the drum volume diameter (D), calculated many ways, in This is not enumerated.

This control mode requires the inverter performance is better than PID regulator, synchronous instruction to accurately match the frequency of such systems easier to stabilize, otherwise the system will shock and instability. This model is used in wire drawing machine with pull and continuous rolling mill drive control. The use of a torque control mode, when the mechanical properties of volatility, there will be difficulties in drawing, rolling mill, which do not normally fixed.

Torque tension control mode A torque mode, open loop tension control

In this mode, without tension feedback device detection, can get results more stable tension control, simple structure, is better. But the need to work in the closed-loop vector inverter control mode, you must install Speed Motor Or encoder in order to make accurate measurement of motor speed feedback.

Torque is calculated as follows: T = (FD) / (2i) One: T F converter output torque command instruction set tension mechanical transmission ratio i roll the volume diameter D

Motor torque was calculated after the current loop to control the inverter, so that you can control the motor output torque. So torque calculation is very important. This control is used in tension of less precision on the occasion, in my company have Xinke wide range of applications. With companies such as degreasing precision machine, air furnace winding control are used to control this mode.

2, torque mode torque mode, open loop tension control

Tension in the tension of closed-loop control based on the open-loop control feedback loop to increase the tension adjustment. Tension by tension feedback signal detection device settings constitute a PID closed loop tension regulation, adjust the inverter output torque command, so that the tension can get a higher control precision. The tension calculation and the same open-loop control. In either open-loop mode or closed loop tension mode, the system increases, slowing the process, the need to provide additional torque to overcome the inertia of the system. If not compensated, there will be rolling when the tension is low the process of acceleration, deceleration when the tension is too large, the process of unwinding when the tension is too large acceleration, deceleration phenomenon of tension is low.

This control mode is used in paper making, textile winding tension control of occasions. I still do not need this kind of control the company.

Coil diameter calculation In all the models need to use rolls of paper trail, we all know, in the production process begins with the paper machine is constantly smaller diameter, diameter of coiler volume becomes larger and larger, that is torque to volume with the diameter change, to get a stable tension control. Volume reel diameter calculation shows how important. Volume diameter in the calculation of two ways: one is good through the external coil diameter will be calculated directly transmitted to the inverter is normally PLC Obtained in the operation. The other is their computation were Inverter, Vector Inverters have coil diameter calculation function, the majority of applications are received by transducer own operations. This reduces the complexity of PLC programs and debug more difficult and reduce costs.

Converter own paper trail calculated in three ways:

1, speed calculation method: Current line speed through the system and the output frequency to calculate volume diameter.

The formula is as follows: D = (iV) / ( n) D Drive I asked for paper machine drive motor speed than the n velocity V

When speed is low, the material speed and output frequency is lower, the smaller the detection error will cause the coil diameter calculation produces a large error, so to set a minimum speed, when material velocity below this value, coil diameter calculation stops, coil diameter the current value remains unchanged. This value should be set to normal speed the following. Most applications use this converter under the coil diameter calculation method.

2, the integral method: Drum rotation by the material thickness of the paper turns to accumulate or decreasing diameter, wire needed for the set number of laps on each floor.

This method for the importation of material thickness, if the thickness is fixed, can be set in the inverter. This method is the production of a single occasion are widely used.

If the thickness is constantly changing needs, the need to

by:gaga

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