Abnormality Diagnosis for Multi-Drive Single Motor Systems
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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 devices and do not account for scenarios where a single motor is driven by multiple drivers.
Innovation Solution
An abnormality diagnosing device and method that acquires rotational speed and phase current values of a motor driven by multiple motor driving devices, determining abnormalities based on absolute rotational speed and phase current thresholds, with the determination unit identifying issues if the rotational speed exceeds a predetermined value and a phase current value is below a threshold for a continuous time period.
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 abnormality diagnosis becomes ineffective or erroneous
Solution Approach 1:
The patent segments the diagnosis function by separating the determination unit from the motor driving devices. The determination unit independently evaluates abnormality determination values from multiple driving devices, allowing each device to maintain simple structure while achieving reliable multi-device diagnosis through centralized logical processing
Solution Approach 2:
The determination unit serves multiple functions: it receives abnormality determination values from multiple different motor driving devices, processes them uniformly, and generates comprehensive diagnosis results. This universal processing capability enables the system to handle various driving device configurations without increasing individual device complexity
2Adaptability or versatility
If multiple motor driving devices drive a single motor, then the motor control capability is improved, but the existing diagnosis methods cannot detect abnormalities correctly
Solution Approach 1:
The system implements feedback by having each motor driving device output an abnormality determination value based on its motor phase current检测结果, which are then fed to the determination unit. This feedback mechanism enables continuous monitoring and accurate detection of abnormalities across multiple driving devices operating the single motor
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 motor driving devices drive the motor by supplying three-phase alternating currents to a plurality of three-phase windings possessed by the motor. The abnormality diagnosing device is equipped with a rotational speed acquisition unit for acquiring a rotational speed value of the motor, a current acquisition unit for acquiring phase current values of respective phases flowing through the three-phase windings, and a determination unit for determining the presence of an abnormality, if an absolute value of the rotational speed value exceeds a predetermined value, and an absolute value of the phase current value of any one phase of the three-phase windings is less than a threshold value continuously for a predetermined time period.