Full-closed-loop nonlinear prediction control method and system for servo press

Abstract

The invention relates to the technical field of application of servo press, and particularly discloses a full-closed-loop nonlinear prediction control method and system for a servo press. According tothe full-closed-loop nonlinear prediction control method and system, a sliding block of the servo press is used as a direct control object, and the full-closed-loop control covers the position control of a motor and the position control of the sliding block; due to the fact that the precision of a grating ruler position sensor, installed on the sliding block, is quite high, factors such as transmission system errors and motor control errors of the servo press can be fully considered, the workload in the calibration process is greatly reduced, and the direct full-closed-loop control method ofthe press can be realized. According to the full-closed-loop nonlinear prediction control method and system, the sliding block position of the servo press can be directly controlled, and the control is performed by applying a generalized predictive control algorithm strategy to the servo motor so that the position of the sliding block can be adjusted on line in real time.

Description

[0001] (1) Technical field [0002] The invention relates to the technical field of application of servo presses, in particular to a fully closed-loop nonlinear predictive control method and system for servo presses. [0003] (2) Background technology [0004] The control method of the servo press is divided into three modes: open loop, semi-closed loop and fully closed loop. The traditional press open-loop control system mainly uses the induction motor as the power source of the press, and the frequency converter as the control conversion unit and amplification unit. The output shaft of the motor drives the flywheel and the large gear to rotate, and an angle sensor is installed at the center of the output shaft of the motor, and the position of the slider can be calculated according to the current angle, so as to carry out production and processing. [0005] With the improvement of processing technology requirements, the position control accuracy of the slider is also improve...

AI Technical Summary

Problems solved by technology

[0007] When the above method is used for control, due to the neglect of the transmission system error between the motor and the slider in reality, the deformation of the machine tool during the operation of the slider, and the gear gap, etc., there will be a large error in the derivation process based on the motor angle or crank angle. System errors, these errors will directly affect the repeat positioning accuracy and position control accuracy during high-precision production and processing

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