Sang-Hyuk Lee, Seok-Kyoon Kim, and Kyo-Beum Lee, "Critical Damping Double Integral Control for PMSM Speed Control Applications via Order Reduction Technique," International Journal of Control, Automation and Systems, in press. -SCIE > Paper

This study presents an advanced q-axis current-independent feedback system design technique for permanent magnet synchronous motors 

(PMSMs), which robustly regulate speed and d-axis current in the presence of model-plant mismatches. The contributions of this study are 

summarized as follows: (a) model-independent pole-zero cancellation (PZC) filters for position, speed, acceleration, and d-axis current, to improve 

closed-loop accuracy; (b) simple filter-based double integral control laws for speed and d-axis current, involving feed-forward terms by the filtered 

signals and disturbance observers; and (c) assignment of the critically damped transfer function to the closed-loop system through high-order PZC 

technique for the feedback system gains. An e xperimental study with a 700-W PMSM dynamo validates the practical effectiveness of the beneficial 

closed-loop analysis results.