Method and apparatus for controlling operation velocity of linear servo system of high-precision numerical control machine tool

Abstract

The invention discloses a method and apparatus for controlling the operation velocity of a linear servo system of a high-precision numerical control machine tool. The method includes the following steps: adopting a fuzzy sliding mode controller, adopting the exponential approach law at an approach motion stage, and adopting fuzzy control to realize switch control of a sliding mode at a sliding mode motion stage. The method enables a system to have excellent robustness and anti-interference capability, reduces buffeting of the operating velocity of the system, and accelerates responding velocity of the system. According to the invention, the apparatus includes a DSP digital signal processor unit, an A / D module, a rectification filtering module, a linear motor, an IPM intelligent power module, an encoder, a sensor, a current detecting module, a photoelectric isolation module and a fault detection module, etc.

Description

technical field [0001] The invention belongs to the field of motor control, in particular to a method and device for controlling the running speed of a linear servo system applied to a high-precision numerical control machine tool. Background technique [0002] With the development of advanced manufacturing technologies such as ultra-high-speed cutting and ultra-precision machining, higher and higher requirements are placed on the performance of modern machine tools. Therefore, the traditional feed system, such as "rotary servo motor + ball screw" technology has become It is difficult to meet the requirements of high-precision CNC machine tools for maximum feed speed and positioning accuracy. Linear motors are widely used in various linear motion applications because of their advantages of generating linear mechanical motion without intermediate mechanical conversion devices, especially in the field of high-speed processing with high efficiency and high precision as the basi...

AI Technical Summary

Problems solved by technology

However, in the practical application of modern industry, whether it is the traditional control strategy represented by PID control, or the modern control strategy such as robust control, adaptive control, H∞, or the simple intelligent control strategy, there are some problems, such as : Thrust fluctuation is large, precision is not high enough, robustness is poor, etc., it is difficult to achieve the ideal control effect, and cannot meet the requirements of high-performance linear servo system

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