Speed Control of Low-Speed PMSM Based on improved Proportional-Resonant and Kalman Filter Strategy

Permanent magnet synchronous machines (PMSMs) suffer from degraded speed control accuracy due to periodic disturbances and insufficient position sensor resolution under low-speed operation. First, the improved proportionalresonant (PR) controller is proposed to enhance the capability to suppress periodic disturbances with unknown frequencies by parallel connecting an adaptive quasi-resonant controller. Furthermore, a dynamic position estimation method based on Kalman filter is employed to mitigate position sampling errors caused by low-resolution position sensors. Experimental results demonstrate that the proposed strategy significantly enhances system operation stability and markedly improves speed control precision