Motor Control Device Abnormality Repeatability Logic
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Solution Overview
Problem
Existing motor control systems fail to effectively prevent the recurrence of abnormalities due to incomplete investigation and lack of removal of underlying causes, leading to potential erroneous operations when abnormality reset processes are performed without addressing the root cause.
Innovation Solution
A motor control device with a control processing unit, abnormality determining unit, specific abnormality storage unit, and abnormality releasing unit that determines the repeatability of detected abnormalities, stores occurrence information of specific abnormalities, and only allows motor operation after the occurrence information is erased, ensuring that the motor is not driven until the underlying cause is addressed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If alarm state reset process is performed easily to release abnormality alarm, then ease of operation is improved, but reliability deteriorates due to potential recurrence of same abnormality
Solution Approach 1:
The system performs preliminary actions by automatically detecting abnormality patterns, storing occurrence information in non-volatile memory, and determining repeatability levels before allowing reset operations. This preliminary detection and classification prevents careless resetting of recurring abnormalities while maintaining easy reset capability for one-time abnormalities.
Solution Approach 2:
The system implements feedback by monitoring abnormality occurrences, storing history information, determining repeatability based on stored data, and providing differentiated reset control. The feedback loop ensures that reset operations are appropriately restricted based on learned abnormality patterns, preventing recurrence while maintaining operational ease when safe.
2Reliability
If operation is inhibited for important abnormality codes to prevent recurrence, then reliability is improved, but productivity deteriorates due to extended downtime
Solution Approach 1:
The system dynamically adjusts operation inhibition based on the determined repeatability level of each abnormality. Rather than static inhibition for all abnormality types, the control unit adaptively applies inhibition only when repeatability exceeds the threshold, optimizing the balance between preventing recurrence and maintaining productivity for non-critical recurring abnormalities.
Solution Approach 2:
The system changes the operational parameter (inhibition state) based on the repeatability parameter determined from stored abnormality history. By comparing the determined repeatability against a threshold parameter, the system selectively applies operation inhibition only when necessary, avoiding unnecessary productivity loss while maintaining reliability for significant recurring abnormalities.
Data Source
AI summary
A motor control device includes: a control processing unit that controls the driving of a motor based on a command signal input from a controller and a detection signal which is a detection result of the operation of the motor; an abnormality determining unit that detects an abnormality in the controller, the motor control device, and the motor according to the command signal, the detection signal, and a control signal generated in the motor control device and that determines a level of repeatability of the detected abnormality on the basis of a predetermined criterion; a specific abnormality storage unit that stores occurrence information of a specific abnormality which is determined to have high repeatability on the basis of the predetermined criterion; and an abnormality releasing unit that erases the occurrence information of the specific abnormality stored in the specific abnormality storage unit according to an erasure command signal.