Based on FX1N - 40 mt chip design of ac servo system for cut -

In drum line strip production enterprises, such as steel, aluminum foil, paper rolls, etc. , the cutting system, it is still exists in many enterprises basically closed loop control system of dc or ac frequency conversion, the cutting precision can meet the basic requirements, but usually not very high, with the development of the society, production enterprise excellence, also more and more important to improve their brand image. In view of this, this paper introduces a high precision design of ac servo system for cutting. Designed by this scheme has been implemented and verified the system, the stability and accuracy than in the past have greatly increased, at the same time of reducing the loss and meet the requirements of the customer to product more and more high.

1 system design principle

figure 1: Kang Er ac servo system for cutting of

suppose to S the length of the cutting, the circumference of the active roller is L, the main roller turn circle number N ( Or Angle) , S = LN, this is a linear equation, namely S and N is proportional to the, assuming that machine gear reduction ratio of K, can calculate S and motor turning circle number X, S * X/K = L. This 'S and X is still a linear equation, therefore to get S the length of the need, only need to control the motor turning laps. In the original system adopts frequency converter, PLC controller, encoder and high speed counting module to control system, PLC controller given value ( The length of the corresponding pulse quantity) Into frequency converter drive motor, motor and drive pulse produced by the rotation of the encoder, back to the counter to the PLC and the given value, until it is equal to stop the motor running. Although this system by adjusting the frequency converter in practical use, the introduction of the first and second deceleration time to reduce the inertia of the motor, make the motor in a very slow crawl crash when parking. But the precision of the system still can't be very high. The downside:

1) The encoder and motor coaxial, not a whole;

( 2) Electric parking brake is to be used for braking and brake speed and power of influence on the accuracy will be. And the use of ac servo system for both 2

s work station of the system hardware design By the Lord to make electric control scale system of automatic and manual, provided by 8421 coded dial the code switch cutting size you need.

■  PLC controller- The FX1N - 40 mt, the PLC has a lower cost, and with the need of high-speed pulse output, a unit of PLC can output 2 points 100 KHZ pulses at the same time, the PLC is equipped with seven special instructions, including zero return, absolute position sensing, absolute or relative drive and special pulse output control, and strong anti-jamming capability, and easy in programming, using area wide, convenient purchase.

s - servo motors and drives MDMA202A1G adopts panasonic servo motor servo motor, the motor with coaxial precision rotary encoder, the encoder is incremental 2500 p/r, resolution: 10000; Drive by panasonic MDDA203A1A and system has good control performance of servo motor, the system stability is good, don't need human intervention after setting up parameters, high reliability, almost no maintenance, so there is no maintenance costs.

figure 2: the control system hardware diagram

2 control system software for USES mitsubishi FX1N - 40 mt, with its accompanying FXGP/WIN software ladder diagram programming language, very intuitive and easy to understand, the whole program is concise, and easy in communications with drive, just a simple wiring can be completed.

figure 3: the programming block diagram

figure 4: a program test figure

3

s the advantages of using ac servo smooth operation, low speed also won't appear vibration;

s high control accuracy, ac servo control accuracy by the motor shaft after the rotary encoder guarantee;

s response speed, deceleration time can be finished in a very short time;

s constant torque output, not affected by rotation speed;

s strong overload capacity;

s ac servo driving system of closed loop itself, more reliable control. 4 conclusion

this scheme design of the system, the stability and accuracy than in the past have greatly increased, not only reduced the loss, but also meet the requirements of the customer higher, economic benefit is significant. Also for the future promotion of accumulated experience, and then the next few years we have changed the other lines, a low cost to obtain the very good effect. Later, in the peer recognition and promotion, all of the lines to later adopted the class system, without the original way of frequency conversion pinch.

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