A reliable initial rotor position estimation method for sensorless control of interior permanent magnet synchronous...

Area of Science:

• Electrical Engineering
• Power Electronics
• Control Systems

Background:

• Reliable start-up of Interior Permanent Magnet Synchronous Motors (IPMSM) is crucial for their operation.
• Accurate initial rotor position estimation is essential for efficient IPMSM control.
• Conventional methods often require complex filtering or have limitations in certain operating conditions.

Purpose of the Study:

• To propose a novel and reliable initial rotor position estimation method for IPMSMs.
• To enhance the accuracy and robustness of magnet polarity detection.
• To develop a method suitable for both standstill and free-running rotor applications.

Main Methods:

• Combines improved high-frequency pulse signal injection with d-axis current bias injection.
• Separates signal injection and field-oriented control periods, eliminating the need for filters.
• Estimates magnet polarity by exciting positive and negative d-axis currents and accumulating peak current values.

Main Results:

• Successfully estimates magnet polarity and initial rotor position.
• Improves the reliability of magnet polarity detection.
• Demonstrates effectiveness on a 1.5 kW IPMSM drive platform.

Conclusions:

• The proposed method offers a reliable approach for IPMSM start-up.
• It is effective for both standstill and free-running rotor scenarios.
• Simplifies the estimation process by removing filtering requirements.