Servo Gain Estimation for Cross-System Motor Control Tuning

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Solution Overview

Problem

Existing servo motor systems face challenges in adjusting control parameters across separately managed motion control systems and low-order systems, leading to inefficiencies and difficulties in coordinating different unit systems, especially when only the low-order system is operable.

Innovation Solution

A motor control apparatus with a control gain estimator that estimates control parameters based on motion control deviations and commands, enabling seamless adjustment across both motion control and low-order systems, even when they are separately managed.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If control parameters are adjusted only within the low-order system (servo amplifier), then the low-order system can operate independently, but control parameters of the motion control system cannot be adjusted and mismatches in unit systems cannot be eliminated

Engineering Contradiction:

Improveindependent operation of low-order systemVSAvoidadjustability of control parameters across both systems

Core Design Contradiction:

Ease of operationVSAdaptability or versatility

Solution Approach 1:

A conversion table is introduced as an intermediary data structure that stores correspondence relationships between control parameters of different unit systems. The parameter conversion unit uses this conversion table to automatically translate control parameters between the motion control system's unit system and the low-order system's unit system, enabling cross-system parameter adjustment without manual intervention.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent replaces manual parameter adjustment (mechanical/operator-based process) with an automated parameter conversion mechanism. The parameter conversion unit automatically retrieves control parameters from the motion control system, converts them using the conversion table, and transmits them to the low-order system, eliminating the need for manual intervention and resolving unit system mismatches.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Manufacturing precision

If manual adjustment of control parameters is performed to eliminate mismatches between unit systems, then parameter compatibility can be achieved, but the process is time-consuming and less efficient

Engineering Contradiction:

Improveparameter compatibilityVSAvoidtime for parameter adjustment

Core Design Contradiction:

Manufacturing precisionVSLoss of time

Solution Approach 1:

The conversion table is prepared in advance with all necessary correspondence relationships between control parameters of different unit systems. This preliminary preparation allows the parameter conversion unit to perform rapid automatic conversion during operation, eliminating the need for time-consuming manual adjustment while maintaining parameter compatibility.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The parameter conversion unit automatically performs the parameter conversion task without requiring manual intervention. The system serves itself by autonomously retrieving control parameters, converting them using the pre-prepared conversion table, and transmitting the converted parameters to the low-order system, thereby reducing adjustment time while ensuring compatibility.

Inventive Principle:

Principle #25Self-service

3Productivity

If expertise and experience are required for fitting control parameters, then higher efficiency and response can be achieved, but the process becomes complex and time-consuming even for experts

Engineering Contradiction:

Improvesystem efficiency and responseVSAvoidcomplexity of parameter fitting process

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The system automatically retrieves control parameters from the motion control system and uses the conversion table to determine appropriate converted parameters based on the unit system mismatch. This feedback mechanism eliminates the need for expert judgment while maintaining optimal parameter fitting, thereby preserving system efficiency and response without requiring complex manual intervention.

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS20250350222A1Motor control apparatus and method

Publication Date: 2025.11.13 HITACHI IND EQUIP SYST CO LTD

AI summary

A technique adjusts a control parameter between a motion control system and a low-order system for motor control. A controller inputs a motion control deviation based on computation of a motion control command and a motion control response into a first control device, and outputs a servo control command based on a first control gain. A servo amplifier as a motor control apparatus includes a second control device, a power converter, and a control gain estimator. The motor control apparatus inputs a signal based on the servo control command and the motion control response into the second control device, inputs a signal output from the second control device into the power converter, and supplies a motor with a signal from the power converter. The control gain estimator inputs the servo control command and the motion control deviation or the motion control command therein and estimates the first control gain.