PMSM Fault Detection Using D-Q Current Imbalance Signatures
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing fault detection systems for field-oriented controlled permanent magnet synchronous machines (PMSMs) are inadequate in promptly identifying and localizing faults such as winding failures, which can lead to overheating and damage, due to their inability to effectively monitor rotor reference frame current signatures for imbalances.
Innovation Solution
A fault detection circuit comprising a threshold detector, signal detector, and comparator that compares the magnitude of D-axis and Q-axis current values to determine the existence and type of faults, utilizing a rotor reference frame current signature analysis to identify imbalances and derive phase current signatures for fault localization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing fault detection systems are used, then the system structure is simple, but the fault detection precision and timeliness are insufficient
Solution Approach 1:
The fault detection system is segmented into distinct functional modules: a D-axis current value acquisition module, a Q-axis current value acquisition module, a magnitude calculation module, and a comparator module. Each module performs a specific function in the fault detection process, allowing for precise fault detection while maintaining clear system organization and manageable complexity.
2Speed
If existing fault detection methods are used, then the device complexity is low, but the response speed to faults is delayed
Solution Approach 1:
The system continuously acquires and processes D-axis and Q-axis current values in real-time during normal operation, calculating their magnitudes and preparing comparison data before faults occur. This preliminary processing ensures that when a fault occurs, the system can immediately detect it by comparing current magnitudes without delay, achieving fast fault response while using standard control circuitry.
Data Source
AI summary
A method includes receiving first and second output signals from a proportional-integral-derivative (PID) regulator circuit, wherein the first and second output signals represent three-phase currents provided into a machine. The method further includes determining a fault detection signal based on the first and second output signals. The method also includes comparing the fault detection signal to a threshold; and detecting a fault in the machine based on the fault detection signal exceeding the threshold.