Motor Control Device Misconnection Detection via D-Q Axis Analysis
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing motor control devices face challenges in accurately detecting misconnections of motor phase current detecting sensors during aging tests, particularly when using an LR load, as current misdetctions can occur due to sensor misconnection, leading to inaccurate current value measurements.
Innovation Solution
A motor control device that includes a power inverter, a phase converter to convert three-phase AC into d-q-axis current components, and a detector to compare measured and command values, using techniques such as code component separation, polarity determination, and threshold-based analysis to detect misconnections by analyzing the d-q-axis current components and their oscillations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If voltage feedforward control is used for aging test without current feedback control, then the aging test can be performed with LR load, but current value misdetection occurs due to sensor misconnection
Solution Approach 1:
The system performs preliminary misconnection detection by analyzing the relationship between inverter output voltages and detected phase currents before conducting the aging test. This preliminary action identifies sensor misconnections early, preventing inaccurate current measurements during the actual aging test.
Solution Approach 2:
The system establishes feedback control during the aging test by continuously monitoring phase currents and comparing detected values with expected values based on inverter output voltages. This feedback mechanism enables real-time detection of current measurement anomalies caused by sensor misconnections.
2Reliability
If motor phase current detecting sensors are misconnected, then current value misdetection occurs, but existing detection methods cannot accurately detect misconnection during LR load
Solution Approach 1:
The system dynamically adjusts detection strategies based on operating conditions. During LR load aging tests, the system uses voltage-based expected current calculation and feedback comparison, whereas other operating modes may use reverse rotation detection. This dynamic adaptation enables reliable misconnection detection across different test conditions.
Solution Approach 2:
The system changes detection parameters and methods based on the test mode. For LR load conditions, it uses feedback control with voltage-to-current relationship analysis, while for other conditions it employs reverse rotation current detection. This parameter adaptation overcomes the limitation of single-method detection systems.
Data Source
AI summary
A motor control device includes a power inverter, a phase converter, and a detector. The power inverter is configured to convert input power for a motor into a three-phase alternating current. The phase converter is configured to convert the three-phase alternating current into a two-phase alternating current having a d-axis current component and a q-axis current component. The detector is configured to detect a misconnection between current detectors which are each configured to detect the three-phase alternating current.