Adaptive second-order terminal sliding-mode control system and method of permanent magnet linear synchronous motor

Abstract

The invention relates to an adaptive second-order terminal sliding-mode control system and method. On the basis of comparison of a given speed signal and a feedback speed signal of a servo system of a permanent magnet linear synchronous motor, an error amount is obtained; a terminal sliding mode surface is designed based on the error amount and a super-coiling algorithm controlled by the second-order sliding mode is used for realizing the input of a speed controller; and an adaptive control way is introduced to carry out dynamic adjustment on a control gain of the super-coiling algorithm. Therefore, the rapid response of the system is realized; and the system robustness is improved. With the control method, the system can have the high robustness and the system buffeting can be weakened effectively.

Description

technical field [0001] The invention belongs to the technical field of numerical control, and in particular relates to an adaptive second-order terminal sliding mode control system and method of a permanent magnet linear synchronous motor. Background technique [0002] Numerical control technology is a technology that uses digital signals to control the mechanical movement process of the control object. Numerical control equipment is a mechatronic product formed by the penetration of new technologies represented by numerical control technology into traditional manufacturing industries and emerging manufacturing industries. The most fundamental difference between modern CNC machine tools and early CNC machine tools is that their processing speed and processing accuracy have undergone tremendous changes, which have increased by nearly a thousand times respectively. Because high-speed and high-precision machining technology can greatly increase the processing rate, improve prod...

AI Technical Summary

Problems solved by technology

[0004] Scholars have proposed some control methods, such as using robust control theory to design a controller, which can make the system have good robustness, but has a certain degree of conservatism; using adaptive control theory to design a controller can effectively overcome parameter changes. impact on the system, but less so in the case of fast parameter changes and high frequency of external disturbances

Using the sliding mode variable structure control theory to design the controller has the advantages of strong robustness and simple implementation, but the discontinuity of its control effect will lead to chattering

The controller is designed using the terminal sliding mode control theory, which improves the convergence characteristics of the system, but there is a singularity problem

Images