Phase-Lifting Extended State Observer-Based Switching Quasiresonant Control Design for PMSMs With Periodic and Aperiodic Disturbances

Achieving robust and precise speed regulation in permanent magnet synchronous motor (PMSM) drive systems remains a significant challenge, particularly under disturbances comprising both periodic and aperiodic components. For aperiodic disturbances, disturbance observers are commonly employed; however, conventional designs often exhibit slow convergence and phase lag, limiting their effectiveness. To address the issue of slow convergence, we first develop a modified supertwisting extended state o