Abnormality Diagnosing Device for Multi-Drive Motors
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Solution Overview
Problem
Existing abnormality diagnosing systems fail to effectively diagnose driving abnormalities in motors driven by multiple motor driving devices, as they are designed for single motor driving device scenarios and do not account for complexities arising when a single motor is driven by multiple devices.
Innovation Solution
An abnormality diagnosing device and method that calculates differences in voltage command values generated by multiple motor driving devices and determines abnormalities based on these differences, with a determination unit checking if the absolute value of the difference exceeds a threshold continuously for a predetermined time, enabling the detection of driving abnormalities in motors driven by multiple devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing abnormality diagnosing systems are used for motors driven by multiple motor driving devices, then the system configuration remains simple, but the ability to diagnose driving abnormalities is insufficient
Solution Approach 1:
The abnormality diagnosing device is designed to handle multiple motor driving devices simultaneously by calculating voltage command values from multiple sources and comparing them. The determination unit universally applies threshold comparison logic regardless of the number of motor driving devices, making the system adaptable to various configurations while maintaining diagnostic capability.
Solution Approach 2:
The diagnosis function is segmented into distinct modules: a command value difference calculating unit that processes voltage commands from multiple motor driving devices separately, and a determination unit that evaluates the differences. This segmentation allows each unit to focus on specific tasks, improving diagnostic reliability without significantly increasing overall system complexity.
2Measurement precision
If voltage command differences are calculated continuously to detect abnormalities, then measurement precision improves, but loss of time increases due to continuous monitoring requirements
Solution Approach 1:
The system performs periodic abnormality checks by continuously calculating voltage command differences and comparing them against thresholds over a predetermined time period. This periodic monitoring ensures accurate detection of abnormalities while maintaining a structured time framework that prevents excessive monitoring delays.
Solution Approach 2:
The determination unit preliminarily establishes threshold values for voltage command differences before actual operation. These pre-set thresholds enable rapid comparison and decision-making during operation, reducing the time required for real-time abnormality detection while maintaining measurement precision.
Data Source
AI summary
An abnormality diagnosing device diagnoses a driving abnormality of a single motor driven by a plurality of motor driving devices. The plurality of motor driving devices calculate a plurality of voltage command values based on a speed command, and voltages are applied to a plurality of windings possessed by the motor based on the plurality of calculated voltage command values, thereby driving the motor. The abnormality diagnosing device is equipped with a command value difference calculating unit for calculating a difference between the plurality of voltage command values calculated by the plurality of motor driving devices, and a determination unit for determining the presence of an abnormality, when an absolute value of the difference calculated exceeds a first threshold value continuously for a predetermined time period.