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Several main problems in the design of the control system in the cold roll forming machine


1. The control accuracy of the input signal: the number of pulses per revolution of the incremental encoder and the circumference of the measuring roller, such as: φ90 measuring roller with photoelectric encoder outputting 1000 pulses per revolution and photoelectric encoder outputting 2000 pulses per revolution The difference between the encoders, the difference in the control accuracy of the φ50 measuring roller and the φ90 measuring roller; what is finally reflected is the length value corresponding to each output pulse, that is, the ratio of the circumference to the number of output pulses per revolution, try to choose the ratio as small as possible The product.
2. The control accuracy of the output signal: Due to the measurement signal lag, the control transmission lag, and the position loop PID control algorithm, the Kp, Ki, Kd and sampling period T determined by the parameter tuning, etc., in the digital PID adjustment control system, At the beginning and end of the process or when the set value is greatly increased, integral accumulation will occur, causing a large overshoot and even oscillation of the system, which is unfavorable for the operation of the servo motor.
3. The mechanical accuracy of the system is controlled within a certain error range, and the electrical control accuracy (encoder pulse) can be improved. It has strong robustness and can meet the requirements of high-precision position control in many occasions. Permanent magnet synchronous motor AC servo The system has become fully mature in technology, has very good low-speed performance, and can achieve high-speed control of weak magnetic field, widens the speed range of the system, and adapts to the requirements of high-performance servo drives. And with the substantial improvement in the performance of permanent magnet materials and the reduction in prices, their applications in the field of industrial production automation will become more and more extensive, and they have become the mainstream of AC servo systems.
4. In order to protect servo controllers and motors and other equipment, considering that the system contains many components that are sensitive to static electricity (such as thyristors), their ability to withstand overvoltages and overcurrents is poor, and they must be designed in strict accordance with relevant standards. Installation, for example, fully consider the safety capacity of the servo controller and the motor, adopt internal and external protective grounding, external protective zeroing, shielding of weak current signal lines, power lines, speed feedback lines, and separation of shielded and unshielded lines.

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