Sensorless control of dual three-phase permanent magnet synchronous motor based on speed feedback and...

Area of Science:

• Electrical Engineering
• Control Systems
• Robotics

Background:

• Dual three-phase Permanent Magnet Synchronous Motors (PMSMs) offer high reliability and low harmonic content, ideal for demanding applications.
• Existing sensorless control methods for PMSMs face limitations in accuracy and stability across the full speed range.

Purpose of the Study:

• To propose a novel, full speed domain sensorless control technology for dual three-phase PMSMs.
• To enhance system accuracy, stability, and practicality, particularly for new energy vehicles.

Main Methods:

• Established a mathematical model of the dual three-phase PMSM in a static coordinate system.
• Utilized a flux linkage observer to obtain sine/cosine signals and velocity/angle information.
• Introduced an estimated angle error parameter and speed feedback to improve observer accuracy.
• Employed a stator current Frequency-Variable Tracker (FVT) to minimize current error.
• Incorporated rotor disturbance into a fourth-order Extended State Observer (ESO) for precise rotor position and speed calculation.

Main Results:

• The proposed sensorless control technology significantly improves estimation accuracy and stability.
• The integration of speed feedback and FVT effectively reduces errors and enhances observer performance.
• The fourth-order ESO accurately calculates rotor position and speed, even under disturbance.

Conclusions:

• The developed sensorless control technology demonstrates high reliability and precision for dual three-phase PMSMs under dynamic and static conditions.
• This advancement holds significant practical value for applications in new energy vehicles and other high-power systems.