Application of the hottest AC servo system in coil

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Application of AC servo system in coil cross cutting line

abstract: anewresolution of the lengthcontrolisputforwardbyconsideringthetechnicalcharactericsandrequirementsofthelengthcontrolsystemduringthetransversecutinglineofrollandtheprogrammablecharacterofttwinline63serieservodrive, whichisimple, As a new generation of fertilizer synergist ywords:acservo-systemlengthcontrolpositioncontrol 1 Introduction

at present, digital AC servo systems are widely used in some motion control systems that require high positioning accuracy or dynamic response. The driver of this servo system samples the position of the photoelectric encoder at the rear end of the motor shaft, and forms a closed-loop control system of position and speed between the driver and the motor. Its position control has high resolution and good reliability, which has become the development trend of servo system

fixed length control is widely used in steel rolling production, and its control performance directly affects the quality of products. At present, most of the old production lines still use the traditional DC servo control, but the new production lines widely use the digital AC servo system, and its superior performance has been fully reflected in production. 2 working principle of coil cross shear unit

2.1 system composition

high speed coil cross shear unit is a common sheet metal equipment. Usually, it cuts 0.2mm ~ 4 mm metal coils with a driving effect of logistics transportation of 1:4 into plates according to the requirements of users. The coil transverse shear unit is mainly composed of discharging part, looper part, feeding part, shearing part and stacking part. The movement of the feeding part is intermittent. During the stop of the feeding movement, the scissors part moves and cuts off the material sent by the feeding part horizontally. The discharging part moves continuously, while the looper part coordinates the speed of the feeding part and the discharging part. The structural diagram of the high-speed coil crosscutting unit is shown in Figure 1. Fig. 1 structural diagram of coil cross cutting unit 2.2 working principle

in the coil cross cutting unit, the cross cutting of coil is carried out at the time of material pause, that is, when the cutting edge is separated, the fixed length control system is started, and the length is controlled by the servo driver containing pulse generator. After triggering, the system directly takes the preset addition and subtraction rate, maximum speed, S-curve and target length as basic parameters, Calculate the running speed curve, and directly drive the servo motor to automatically run to the positioning. When the conveying length reaches the specified length, the coil stops moving, the cutting edge of the cutter is closed, and the coil is cut off. Cycle in turn, and automatically cut the coil into plates of specified length. Its speed curve is shown in Figure 2. Figure 2 speed control curve 3 system composition and implementation

3.1 control mode

according to the different position control modes, it can be divided into two types:

(1) position semi closed loop control

in this control mode, the feedback element on the servo motor is both speed feedback element and position feedback element. According to the set acceleration, running speed, deceleration and length, in the servo controller, the positioning function module automatically completes the control of speed and position. The disadvantage of this control method is that it can not eliminate the length error caused by the slippage of the traction roller and the mechanical transmission gap

(2) position full closed-loop control

in the position full closed-loop control mode, a measuring wheel is added. An incremental photoelectric encoder is installed on the measuring wheel. The encoder on the servo motor is a speed feedback element, and the encoder on the measuring wheel is a position feedback element. In this way, the servo controller can eliminate the length error caused by the slippage of the traction roller and the mechanical transmission gap. However, the position system is prone to oscillation

after comprehensive consideration, the author adopts the semi closed-loop control mode. Therefore, the mechanical transmission gap is considered in the design of the program, and the hardware composition and performance of the

3.2 system are eliminated through software

the hardware material testing machine of this system is dominated by the past manual hydraulic testing machine 1. The part mainly consists of a programmable Twinline servo drive, which passes the exposed print head through the paper outlet of the cover plate and a 5.7 "touch screen, The models are tlc6382f332141 and xbtg2110 respectively

tlc6382f332141 can simultaneously control the movement of the motor and process input and output signals. The input and output signals are carried out in a circular manner in parallel with the motion of the shaft. The form of motion can be freely determined and can be synchronized with external events. It can be programmed in six programming languages. It has the following motion control functions:

(1) relative and absolute "point-to-point" positioning

(2) it has a variety of feedback modules, It can easily form a position semi closed loop/position full closed loop control system

(3) electronic reducer

(4) built-in logic operation function and arithmetic operation function

(5) reading and recording of all parameters

(6) adjustment of acceleration and deceleration

(7) change speed during movement

(8) debugging

(9) through can

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