Motor Feedback Control Switching During Detector Abnormalities
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Solution Overview
Problem
Existing motor control systems lack the ability to seamlessly switch to feedback control based on a detector without abnormalities during full-closed control, particularly in cases of abnormality in the separate position detector or its feedback cable, or in the encoder or its feedback cable.
Innovation Solution
A motor control device equipped with first and second abnormality detectors to identify issues in the separate position detector and encoder, respectively, and a switching unit that transitions from full-closed control to semi-closed control or control by only the separate position detector when abnormalities are detected, utilizing the detector with no abnormalities for feedback control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If full-closed control is used with separate position detector, then positioning precision is improved, but system reliability deteriorates when detector abnormality occurs
Solution Approach 1:
The control system dynamically switches between full-closed control mode (using separate position detector) and semi-closed control mode (using encoder) based on the operational status of the detectors. When the separate position detector is normal, full-closed control provides high positioning precision. When abnormality is detected, the system automatically transitions to semi-closed control to maintain reliability, thus resolving the contradiction between precision and reliability.
Solution Approach 2:
The system changes the control mode parameter from full-closed to semi-closed based on detector status. This parameter change allows the system to adapt to abnormal conditions by switching to a control mode that relies on the encoder instead of the separate position detector, thereby maintaining system reliability when the position detector fails.
2Reliability
If semi-closed control is used with encoder, then system reliability is improved, but positioning precision deteriorates compared to full-closed control
Solution Approach 1:
The control mode is dynamically adjusted based on detector status. When the separate position detector is abnormal, the system switches to semi-closed control using the encoder, ensuring continued operation with acceptable reliability. When the detector is restored to normal operation, the system can switch back to full-closed control to regain high positioning precision, thus resolving the precision-reliability trade-off.
Solution Approach 2:
The system performs preliminary switching to semi-closed control when detector abnormality is detected, preventing complete system failure. This preliminary action maintains reliability during abnormal conditions, and the system is prepared to switch back to full-closed control when the detector is restored, thereby recovering positioning precision.
3Reliability
If switching mechanism is added to handle detector abnormalities, then system reliability is improved, but device complexity increases
Solution Approach 1:
The control system incorporates feedback from the separate position detector to monitor its operational status. Based on this feedback, the system automatically determines whether to operate in full-closed or semi-closed control mode. This feedback mechanism improves reliability by enabling automatic adaptation to detector abnormalities without requiring complex external switching devices.
Solution Approach 2:
The control device is designed with multi-functionality to handle both full-closed and semi-closed control modes within a single integrated system. This universal design allows the system to adapt to different operational conditions (normal and abnormal detector status) without requiring separate dedicated systems, thereby improving reliability while minimizing the increase in device complexity.
Data Source
AI summary
The present invention addresses the problem of, when an abnormality has occurred in one detector, switching to feedback control based on a detector in which an abnormality has not occurred. This motor control device 100 is provided with a first abnormality detection unit 115 that detects an abnormality in a separate detector 154 as the detector or a feedback cable 1541 thereof, a second abnormality detection unit 116 that detects an abnormality in an encoder 151 of a motor as the detector or a feedback cable 1511 thereof, and a switching unit 111 that switches from full-closed control to semi-closed control, or to control using only the separate detector. When either of the first abnormality detection unit 115 or the second abnormality detection unit 116 has detected an abnormality, the switching unit 111 switches to control using only any detector in which an abnormality has not occurred.