Parameter Determination Support for Synchronous Motor

Solution Overview

Problem

Determining drive parameters for motors with unknown circuit constants is complex and time-consuming, requiring skilled technicians and extensive procedures.

Innovation Solution

A parameter determination support device that acquires motor specification and output information, determines initial parameters for test running, creates a test-run program, automatically measures operating information, estimates circuit constants, and calculates optimum parameters using a non-transitory computer-readable medium encoded with a program.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If manual determination of drive parameters is performed for motors with unknown circuit constants, then accurate parameter setting is achieved, but the process becomes complex and time-consuming

Engineering Contradiction:

Improveparameter determination accuracyVSAvoiddetermination time

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The system performs self-diagnosis by automatically measuring operating information during test running and estimating circuit constants without requiring external technician intervention. The parameter determination support device autonomously completes the entire parameter determination process, from initial parameter setting to final optimum parameter calculation, eliminating the need for skilled technicians to manually perform complex measurement and calculation procedures.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The patent replaces manual technician operations with an automated computer-based system. The parameter determination support device uses software programs to automatically measure operating information, estimate circuit constants through calculations, and determine optimum parameters, substituting the mechanical/manual process of technician measurement and calculation with an automated electronic system that processes data and performs computations electronically.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Measurement precision

If skilled technicians perform parameter determination manually, then accurate drive parameters are obtained, but the process requires specialized skill and extensive procedures

Engineering Contradiction:

Improveparameter determination accuracyVSAvoidoperation simplicity

Core Design Contradiction:

Measurement precisionVSEase of operation

Solution Approach 1:

The system performs self-diagnosis by automatically measuring operating information during test running and estimating circuit constants without requiring external technician intervention. The parameter determination support device autonomously completes the entire parameter determination process, from initial parameter setting to final optimum parameter calculation, eliminating the need for skilled technicians to manually perform complex measurement and calculation procedures.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The patent replaces manual technician operations with an automated computer-based system. The parameter determination support device uses software programs to automatically measure operating information, estimate circuit constants through calculations, and determine optimum parameters, substituting the mechanical/manual process of technician measurement and calculation with an automated electronic system that processes data and performs computations electronically.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Loss of time

If automatic measurement of operating information is implemented, then determination time is reduced, but measurement and estimation complexity increases

Engineering Contradiction:

Improvedetermination timeVSAvoidmeasurement system complexity

Core Design Contradiction:

Loss of timeVSDevice complexity

Solution Approach 1:

The parameter determination support device serves multiple functions within a single integrated system: it manages test running control, automatically measures operating information, estimates circuit constants through calculation processing, and determines optimum parameters. This multi-functional approach consolidates what would otherwise require separate measurement devices, calculation tools, and determination systems into one universal platform, reducing overall system complexity despite the sophisticated tasks performed.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS10928452B2Parameter determination support device, and non-transitory computer-readable medium encoded with program

Publication Date: 2021.02.23 FANUC LTD

AI summary

To simplify determination of drive parameters upon driving a motor for which circuit constants are unknown, and shorten the time required in determination. A parameter determination support device includes: an automatic measurement part which automatically measures acceleration (rpm/s) of the synchronous motor and D-phase current (A) of the motor drive device, as operating information upon driving while accelerating the synchronous motor under each condition of a first condition based on a base speed, and a second condition in which the D-phase current (A) of the motor drive device was changed from the first condition, according to the test-run program, by applying the initial parameter; an estimation part which estimates an inductance ratio (dimensionless) and a Q-phase inductance (mH), as circuit constants of the synchronous motor, based on the operating information; and a calculation part for performing calculation of an optimum parameter tailored to the output specification of the synchronous motor, based on the circuit constants.