PWM Switching Delay Correction Method for High-Speed Brushless DC Drives

For high-speed brushless DC (BLDC) drives, the switching-to-fundamental frequency ratio is usually insufficient. As a result, commutation errors caused by PWM switching delay are significant, which means power switches will take action at inaccurate instants. This cause low-frequency current oscillations and produce additional losses. In addition, conventional method accumulative in sensorless operation further lead to instability issues region. order suppress these influences, novel carrier-synchronized strategy proposed this paper. It shows that can eliminate error delay. phenomenon be avoided control performance greatly improved. Finally, verified simulation experiments on 78 000-r/min BLDC drive platform.