Sensorless Speed Control of PMSMs Based on an Improved Fast Power Reaching Law

Area of Science:

• Electrical Engineering
• Control Systems Theory
• Robotics

Background:

• Traditional permanent magnet synchronous motor (PMSM) control requires mechanical sensors, increasing cost and reducing reliability.
• Sensor-based systems are less adaptable to harsh environments, limiting PMSM applications.

Purpose of the Study:

• To develop a high-performance, sensorless speed control strategy for PMSMs.
• To overcome the limitations of traditional sensor-based control systems.

Main Methods:

• A novel non-singular terminal sliding mode observer (NTSMO) and controller (NTSMC) were designed.
• An improved fast power reaching law (IFPRL) was proposed to enhance convergence and mitigate chattering.
• The IFPRL dynamically adjusts gains and uses a scaling coefficient for improved performance.

Main Results:

• The proposed IFPRL-based NTSMC + NTSMO scheme reduced speed control RMSE by 2.7% compared to traditional methods.
• Numerical simulations and experimental tests validated the effectiveness of the proposed strategy.
• The method demonstrated superior dynamic response, higher control accuracy, and enhanced robustness.

Conclusions:

• The novel sensorless control strategy reliably controls PMSM speed without mechanical sensors.
• The proposed approach offers significant improvements in performance and robustness for PMSM applications.
• This sensorless method enhances adaptability and reduces complexity and cost in PMSM systems.