In a study published in Sensors, a research group led by Prof. LI Hongwen from the Changchun Institute of Optics, Fine Mechanics and Physics of the Chinese Academy of Sciences,studied develope a novel fixed-time convergent sliding mode control (FSMC) strategy for permanent magnet synchronous motors (PMSM), significantly improving speed regulation performance in electric drives. The work addresses the challenges of conventional sliding mode control (CSMC) methods, which often exhibit slow convergence and unacceptable chattering.
The proposed FSMC technique, along with a fixed-time convergent sliding mode observer (FSMO), utilizes fixed-time control theory to achieve faster convergence and superior robustness. This hybrid control strategy ensures that the PMSM speed loop converges to the desired speed within a predefined, fixed time frame, regardless of initial conditions.
During the research, the team first designed the FSMC algorithm to enhance the convergence speed and robustness of the speed loop. By integrating the FSMO, the system gains improved estimation of motor states, enabling more precise control.
The combined FSMC-FSMO approach effectively mitigates the issues of CSMC, such as slow convergence and chattering, resulting in faster response speeds, higher tracking accuracy, and enhanced robustness to model uncertainties and external disturbances.
The experimental results demonstrate the effectiveness of the proposed FSMC-FSMO strategy. Compared to conventional methods, the new control scheme exhibits significantly faster convergence, with the PMSM speed loop reaching the target speed within a shorter time frame. Moreover, the reduced chattering ensures smoother operation and improved performance.
The development of this FSMC-FSMO control strategy for PMSM speed regulation represents a significant advancement in the field of electric motor control.
The improved performance in terms of response speed, tracking accuracy, and robustness has the potential to enhance the efficiency and reliability of electric drives in various applications, including industrial machinery, automotive systems, and renewable energy technologies.
中文
