PMSM Controller Fault Diagnosis via 3-Phase Voltage Comparison
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Solution Overview
Problem
Existing technologies fail to effectively diagnose failures in controllers of permanent magnet synchronous motors (PMSMs) used in steering devices, particularly in PI controllers, coordinate converters, current sensors, and motor position sensors, which are critical for ensuring system reliability and safety.
Innovation Solution
A controller failure diagnosing device and method that measures and inversely calculates d-axis and q-axis control voltages based on 3-phase voltage and input currents, comparing these values to diagnose controller failures by measuring 3-phase voltage at the inverter output terminal and using design parameters to identify discrepancies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a PI controller is adopted to reduce errors in permanent magnet synchronous motor control, then control precision is improved, but the ability to diagnose failures in control components deteriorates
Solution Approach 1:
The patent segments the controller into multiple functional modules (coordinate converter, PI controller, current controller) and implements independent failure diagnosis for each module by comparing actual output voltages with expected output voltages calculated from input currents and control parameters, enabling targeted identification of failure locations without compromising overall control precision
Solution Approach 2:
The patent introduces an intermediary diagnostic mechanism that uses the relationship between input currents and output voltages as a mediator to detect failures. By calculating expected output voltages based on measured input currents and control parameters, and comparing them with actual output voltages, the system can identify failures in control components without adding external sensors that would compromise control precision
2Device complexity
If traditional control methods are used without failure diagnosis, then device complexity is reduced, but system reliability deteriorates due to undetected failures
Solution Approach 1:
The controller performs self-diagnosis by using its own internal parameters (input currents, control gains, switching frequencies) to calculate expected output voltages and compare them with actual output voltages. This self-service approach enables failure detection without adding external diagnostic equipment, maintaining device complexity at acceptable levels while significantly improving system reliability
Solution Approach 2:
The patent implements a feedback mechanism where the controller continuously monitors the relationship between input currents and output voltages, compares actual performance with expected performance based on control parameters, and provides feedback on the health status of control components. This feedback loop enables real-time failure detection without requiring complex additional hardware
Data Source
AI summary
The controller failure diagnosing device and method may provide a controller failure diagnosing technique that may diagnose a failure in the controller using the characteristics of the controller when using a motor and an inverter. In particular, there may be provided a controller failure diagnosing device and method capable of diagnosing a failure in a controller by comparing the measured 3-phase voltage of the motor and the calculated controller output voltage or by determining entry into an unstable control area condition at an early stage.