The permanent magnet synchronous motor(PMSM) speed control system and its torque ripple can be affected by the dead-time effect of space vector pulse width modulation(SVPWM). To solve this problem, on the basis of the vector control method, a novel active-disturbance rejection controller(ADRC) with dead-time compensation is presented. By combining dead-time compensation with ADRC, the magnitude of torque ripple can be significantly reduced. Simulation
results show that the harmonic content can be reduced dramatically, the speed control system is more stable, and the torque ripple can be suppressed effectively in the improved ADRC system.