Sensorless PMSM Control via Adaptive Observer for Emergency Stability
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Solution Overview
Problem
Existing methods for controlling high performance permanent magnet synchronous motors during emergency operations lack effective sensorless detection methods, particularly for accurately estimating the magnetic pole position without position sensors, which affects dynamic performance and stability.
Innovation Solution
A position sensorless control method using an adaptive observer based on a voltage applied to the motor and measured current, reflecting position and speed error information, and configured from an approximated synchronous coordinate current differential equation model, estimates the magnetic pole position using a phase lock loop (PLL) controller to minimize errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If position sensors are used to detect magnetic pole position and rotational speed, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent extracts the position detection function from physical sensors and implements it through software-based adaptive observer algorithms that estimate magnetic pole position and rotational speed from electrical measurements (voltages and currents), eliminating the need for additional position sensors in emergency operation mode
Solution Approach 2:
The patent replaces the mechanical/electrical sensor system with a computational model-based system using adaptive observers and phase lock loop controllers that calculate position and speed from electrical signals, substituting physical measurement devices with mathematical estimation methods
2Device complexity
If conventional sensorless control methods are used during emergency operation, then device complexity is reduced, but measurement precision and reliability deteriorate
Solution Approach 1:
The patent implements dynamic adaptive observer algorithms that continuously adjust their estimation based on real-time voltage and current measurements, allowing the system to adapt to changing operating conditions during emergency operation and maintain accurate position and speed estimation without physical sensors
Solution Approach 2:
The patent employs feedback mechanisms through the adaptive observer structure where estimation errors are continuously minimized by adjusting the estimated position and speed values, and through phase lock loop controllers that use position error feedback to refine magnetic pole position estimation, ensuring reliable operation without sensors
3Reliability
If accurate magnetic pole position estimation is achieved during emergency operation, then reliability is improved, but device complexity increases due to adaptive observer configuration
Solution Approach 1:
The patent makes the existing inverter and control unit perform multiple functions: normal vector control during regular operation and sensorless emergency control during fault conditions, using the same hardware infrastructure for both modes to avoid additional complexity while maintaining reliability
Solution Approach 2:
The patent changes control parameters and switching strategies based on operational mode, using different control algorithms (conventional vector control vs. adaptive observer-based sensorless control) depending on whether the system is in normal or emergency operation, optimizing performance for each condition without requiring permanent additional hardware
Data Source
AI summary
The present invention provides a position sensorless control method of a high performance permanent magnet synchronous motor during emergency operation, which can accurately detect a magnetic pole position of the synchronous motor based on a position sensorless vector control using an adaptive observer configured based on a permanent magnet synchronous motor model.