Servo parameter self-tuning method based on error measurement for numerical control system

A technology of parameter self-tuning and numerical control system, applied in general control system, control/adjustment system, program control, etc., can solve problems such as labor-consuming, time-consuming, and influenced by human factors, so as to improve efficiency, save time and human resources , The effect of eliminating the influence of human factors

Active Publication Date: 2016-11-09
上海柏楚电子科技股份有限公司
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  • Application Information

AI Technical Summary

Problems solved by technology

At present, the setting of servo parameters in the field of laser cutting mainly relies on experience for manual setting, which is time-consuming, labor-intensive and also affected by human factors.

Method used

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  • Servo parameter self-tuning method based on error measurement for numerical control system
  • Servo parameter self-tuning method based on error measurement for numerical control system
  • Servo parameter self-tuning method based on error measurement for numerical control system

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Embodiment

[0024] Taking the X, Y dual-axis servo transmission system as an example, first determine the parameters of the inner speed loop. The speed loop gain Kv affects the response speed of the servo. On the premise that the servo system is stable, the speed loop gain should be increased as much as possible to improve the speed loop response speed. Choose different speeds to process a straight line and analyze whether there is oscillation through the error measurement results. When oscillation occurs, it proves that the speed loop gain parameter setting is too large. At this time, reduce the speed loop gain by an appropriate amount until there is no oscillation, and complete the speed loop tuning process.

[0025] After the speed loop tuning is finished, start to tune the position loop gain Kp and the speed feed-forward compensation parameter Vff. By analyzing the Bode diagram of the servo control system and the theoretical derivation of the servo system transfer function, in order t...

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Abstract

The invention relates to the field of laser cutting numerical control and specially relates to a servo parameter self-tuning method based on error measurement for a numerical control system. The method comprises the following steps: 1) graph input; 2) position instruction sequence generation; 3) servo parameter adjustment; 4) servo driving; 5) feedback position acquisition; 6) feedback position graph fitting; 7) feedback position graph generation; 8) graph comparison; and 9) error analysis: the numerical control system analyzes contour error between a graph formed by fitted curves and an input graph, determines the position of the contour error and the value of the contour error, and if the value of the contour error accords with preset error parameters, terminates the operation, or otherwise, returns to the step 3) to reset the servo parameters until the contour error accords with the preset error parameters. Compared with the prior art, the method allows servo driving error to be seen clearly; and self-tuning can also eliminate influence of human factors, thereby improving accuracy and reliability of servo parameter setting.

Description

technical field [0001] The invention relates to the field of laser cutting numerical control, in particular to a servo parameter self-tuning method for a numerical control system based on error measurement. Background technique [0002] With the development of science and technology, laser cutting technology has gradually entered the stage of history. High speed and high precision have become the pursuit of laser cutting. However, speed and precision are mutually restricted. Under the premise of ensuring speed, the improvement of precision has become the key to the development of the industry. Laser cutting error consists of three parts: interpolation command error, multi-axis servo control error and machine tool transmission error. Among them, the instruction error is the motion trajectory planning error, and the trajectory interpolation algorithm error and the machine tool transmission error at the current stage have been controlled within the allowable range of error. Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B19/4099
CPCG05B19/4099G05B2219/36136
Inventor 万章石斌
Owner 上海柏楚电子科技股份有限公司
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