An optimized sliding‐mode observer control algorithm for vehicle sensor‐less PMSM

Abstract An optimized sliding‐mode observer control algorithm for permanent magnet synchronous motor (PMSM) is proposed to solve the problems in conventional algorithms (e.g., system chattering and phase delay). The adopts a new piecewise function as switching reduce chattering. low pass filter substituted with complex coefficient delay caused by filter. Moreover, counter emf back obtained using filtering of reintroduced into decrease gain system. simulation results suggest that outperforms reducing chattering, increasing convergence speed, torque pulsation, speed estimation accuracy coping load mutation.