Feeding system servo controller and control method and parameter setting method thereof

Abstract

The invention provides a feeding system servo controller and a control method and parameter setting method thereof. The controller includes a position ring controller body and a speed ring controllerbody which are connected with each other in sequence; the output of the speed ring controller body acts on a mechanical system through a current ring and a servo motor and is used for mode correctionand high bandwidth control of a controlled object in the mechanical system; a peak filter is used for correcting the mechanical mode limiting increasement of a servo control gain, and therefore the high bandwidth control is achieved. The feeding system servo controller has the advantages that open-loop gains are achieved at key frequency bands, great movement control performance and great vibration control performance can be obtained at the same time, the robustness in mechanical parameter changes is high, and defects existing in a method for adopting a notching filter to increase the controlgrain are solved. The servo control method achieves the high bandwidth control through the high open-loop gains of the peak filter at the key frequency bands, the movement control performance and vibration control performance of a feeding system can be improved simultaneously, and the high robustness in the mechanical parameter changes is achieved.

Description

technical field [0001] The invention relates to the servo control of the feed system of a numerically controlled machine tool, in particular to a feed system servo controller and its control method and parameter setting method. Background technique [0002] CNC machine tools are important mechanical manufacturing equipment. With the development of technology and the intensification of market competition, the requirements for high speed and high precision of CNC machine tools continue to increase. High motion and vibration control performance of the feed system is a prerequisite for fulfilling these requirements. Among these two properties, the former is the ability of the feed system to accurately and quickly realize motion commands under control, while the latter is the ability of the feed system to resist cutting force interference and not generate large vibrations. [0003] Generally, a large control bandwidth can be realized through a large control gain, and the control...

AI Technical Summary

Problems solved by technology

Its limitation is that the sensitivity curve of the system has a peak at the notch frequency, which shows that the effect of the notch filter drops sharply when the mechanical resonance frequency is slightly different from the filter frequency, and it also shows that the system's anti-interference at the notch filter frequency band performance drops dramatically

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