Improved non-singular fast terminal sliding mode PMSM control strategy

Area of Science:

• Electrical Engineering
• Control Systems
• Robotics

Background:

• Permanent magnet synchronous motor (PMSM) systems often suffer from large overshoot, jitter, and poor robustness with traditional PI and sliding mode control (SMC).
• Existing control strategies struggle to simultaneously address these limitations, impacting overall system performance and reliability.

Purpose of the Study:

• To propose an improved non-singular fast terminal sliding-mode control (INFTSMC) strategy for PMSM systems.
• To enhance the control capability, robustness, and dynamic response of PMSM systems.
• To overcome the shortcomings of traditional PI and SMC methods.

Main Methods:

• Constructed a novel non-singular fast terminal sliding-mode surface to avoid system singularity.
• Designed an improved power-reaching law to accelerate error convergence and suppress chattering.
• Incorporated an adaptive law for real-time regulation of the reaching law coefficient.
• Developed a beat-free predictive current controller and integrated an extended state observer (ESO) for disturbance observation.

Main Results:

• The proposed INFTSMC strategy effectively suppresses chattering and improves control precision through adaptive law integration.
• The beat-free predictive current controller and ESO enhance the system's dynamic response and disturbance rejection.
• Simulations and experimental results verified the reliability and effectiveness of the INFTSMC strategy.

Conclusions:

• The INFTSMC strategy significantly overcomes the limitations of traditional PI and SMC for PMSM systems.
• The enhanced control method demonstrably increases system response speed and anti-interference ability.
• This advanced control approach offers a more robust and efficient solution for PMSM applications.