Machine Tool Servo Tuning for Gain and Filter Adjustment

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Solution Overview

Problem

Existing machine tools face difficulties in efficiently adjusting the gain and filter settings of servo motors, particularly when new components are mounted or machining programs change, leading to suboptimal performance and increased user reluctance due to complex manual adjustment procedures and lack of timely guidance.

Innovation Solution

A machine tool control device that displays an adjustment screen for servo motor gain and filter adjustments on a display device when new components are mounted or machining programs are changed, allowing for automatic adjustment and inertia estimation, thereby simplifying the process and ensuring appropriate settings.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If manual adjustment of servo motor gain and filter settings is performed, then adjustment precision can be achieved, but adjustment time and operational complexity increase significantly

Engineering Contradiction:

Improveadjustment precisionVSAvoidadjustment time

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The control device automatically detects servo motor parameters and adjusts gain and filter settings without requiring manual operator intervention. The system performs self-diagnosis and self-adjustment based on detected motor characteristics, eliminating the time-consuming manual tuning process while maintaining optimal adjustment precision.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The control device performs preliminary detection of servo motor parameters (inertia, friction, resonance frequency) before actual machining operations begin. By pre-adjusting gain and filter settings based on detected parameters, the system prepares optimal configurations in advance, avoiding time-consuming adjustments during production.

Inventive Principle:

Principle #10Preliminary action

2Measurement precision

If manual adjustment procedures are required, then detailed control is possible, but user effort and operational complexity increase

Engineering Contradiction:

Improvecontrol precisionVSAvoiduser effort

Core Design Contradiction:

Measurement precisionVSEase of operation

Solution Approach 1:

The control device autonomously detects servo motor parameters and adjusts control parameters without requiring operator knowledge of complex adjustment procedures. The system performs self-tuning by detecting motor characteristics and automatically calculating optimal gain and filter settings, dramatically reducing user effort while maintaining precise control.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The patent replaces manual mechanical adjustment procedures with automated electronic detection and control. Sensors and control algorithms substitute for manual operations, detecting motor parameters electronically and adjusting settings through automated control systems, thereby eliminating the need for operators to perform complex manual adjustments.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Device complexity

If servo motor parameters are not adjusted timely, then system simplicity is maintained, but machining performance deteriorates

Engineering Contradiction:

Improvesystem simplicityVSAvoidmachining performance

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The control device continuously monitors servo motor operation parameters during machining and automatically adjusts gain and filter settings based on real-time feedback. When parameter deviations are detected that would affect machining performance, the system promptly recalibrates control parameters, maintaining optimal performance without requiring complex manual intervention procedures.

Inventive Principle:

Principle #23Feedback

4Loss of time

If automatic adjustment is implemented, then adjustment time is reduced, but adjustment accuracy may compromise

Engineering Contradiction:

Improveadjustment timeVSAvoidadjustment accuracy

Core Design Contradiction:

Loss of timeVSMeasurement precision

Solution Approach 1:

The patent employs advanced electronic detection systems and control algorithms to automatically measure servo motor parameters with high precision. Electronic sensors detect motor characteristics (inertia, friction, resonance) and control algorithms calculate optimal settings, achieving accuracy comparable to or exceeding manual methods while dramatically reducing adjustment time.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The control device performs automated detection and adjustment using built-in sensors and processing capabilities. The system self-calibrates by detecting actual motor parameters and automatically computing optimal gain and filter settings, achieving high adjustment accuracy through intelligent algorithms without requiring manual intervention, thereby maintaining precision while reducing time.

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS11787003B2Machine tool

Publication Date: 2023.10.17 FANUC LTD

AI summary

This machine tool includes a spindle, a workpiece support section that supports the workpiece, a servo motor that rotates or moves workpiece support section relative to the spindle, and a control device that controls the servo motor, where the control device displays an adjustment screen for adjustment of at least either of a gain and a filter of the servo motor on a display device when the control device recognizes that the servo motor is newly mounted, when a machining program of the workpiece is changed, or when an operation value of the servo motor or a value calculated based on the operation value deviates from a predetermined criterion.