Servo systems generally have 2 development directions. One is to meet the requirements of general industrial applications. In applications that do not require high performance indicators, the pursuit of low-cost, low-maintenance, and easy-to-use drive products, such as variable frequency motors, frequency converters, etc.
The other is the leading product representing the development level of the servo system: servo motor and servo controller, pursuing high-performance, high-speed, digital, intelligent, and networked drive control to meet the higher application requirements of users.
The application of servo technology in cold forming equipment, such as Highway Guardrail Roll Forming Machine involves these two development directions. The selection of the host computer involves CNC system or programmable logic controller (PLC), and the standard serial communication interface (such as RS-232C) configured by the servo system, RS-422 interface, dedicated multi-core cable interface, etc.) and dedicated local area network interface for system control and data transmission and processing.
The system realizes the following functions: use the online servo device composed of servo motor and servo controller to realize the accurate positioning control block of online punching, and use the main drive system of the system composed of frequency conversion motor and frequency converter to realize the online length hydraulic cutting and positioning control of the product.
For example, the system operating parameters of the cold bending forming equipment for shelves are set through man-machine dialogue.
On-line debugging and setting of servo system parameters, its self-tuning function, system fault self-diagnosis and analysis functions, etc., need to be combined with the production process of the unit, the data collected on site and its processing results, and the selected upper control computer system and software configuration.
Control algorithm:
The cold forming equipment adopts the position and speed signals collected from the position rotary encoder at the shaft end of the main drive motor.
A certain plane of the cold-formed profile contacts the sampling signal of the rotary encoder to form the internal and external closed-loop speed and position adjustment system of the motion control of the main drive AC variable frequency motor of the system. The internal speed control closed loop adopts the speed real-time detection control algorithm.
This not only further improves the low-speed performance of the motor, and reduces the speed fluctuation and torque fluctuation to a very low level, but also ensures the stable operation and speed control of the cold forming process. The external position control closed loop adopts the PID motion control algorithm to ensure the cold forming process. Process positioning control accuracy and position positioning efficiency.