Limited control set-based sensorless press machine full-closed-loop control system and method

Abstract

The invention belongs to the technical field of control technology and metal forming, and particularly relates to a limited control set-based sensorless press machine full-closed-loop control system and method. According to the system and method, the difference between a forming process curve and the actual position of a sliding block is used as a whole machine control system control instruction position input, a kinetic model is established, torque calculation is carried out, and the calculated result is taken as an input of a torque prediction control algorithm. The system and method have the advantages that a non-sensing control algorithm module and a torque prediction algorithm module of a limited control set are arranged in a servo motor driver, the rotating speed and the electromagnetic torque prediction value are calculated, the value function is finally obtained, the position information of the sliding block can be added into the value function to control the position of the sliding block to not be overly controlled, the dynamic performance is obviously improved, the anti-interference performance of the motor servo driver can be improved, the reliability is remarkably improved, and the cost of a servo motor is greatly reduced.

Description

technical field [0001] The invention belongs to the field of control technology and metal forming technology, and in particular relates to a sensorless full-closed-loop control system and method for a press based on a finite control set. Background technique [0002] The slider position control method of the servo press includes three methods, which are open-loop, semi-closed-loop and fully-closed-loop. Open loop is a position closed-loop control method that does not use any servo press; semi-closed loop is a position closed-loop control method other than sliders; full-closed loop is a position control method that uses slider feedback closed-loop. The servo motor of the servo press replaces the ordinary induction motor, and uses a direct drive or a one-stage or two-stage reduction mechanism to drive the crank or connecting rod mechanism, cancels the brake and clutch, and the final actuator is still a slider. The reference "Development of the Latest Servo Press and Future Tr...

AI Technical Summary

Problems solved by technology

The shortcomings of the above three aspects will make the slider unable to be controlled to a given position in the shortest time or within a reasonable time, the dynamic performance is poor, and overshooting may occur during the position control process (if the slider position exceeds Adjustment, indicating that the position set by the user is exceeded, there may be cracks and wrinkles of the formed workpiece), and because the signal of the motor position sensor is sometimes affected by interference or sensor failure, the reliability and stability of the system are greatly reduced

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