Observer-Based Order-Reduction Speed Control for Converter-Fed BLDC Motors With Current-Loop Adaptation

• Published in: IEEE transactions on circuits and systems. II, Express briefs Vol. 70; no. 8; pp. 2934 - 2938
• Main Authors: Kim, Seok-Kyoon, Lim, Sun, Ahn, Choon Ki
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.08.2023; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Active damping; Adaptation; BLDCM; Brushless DC motors; Brushless motors; Buck converters; Closed loops; Control theory; D C motors; Electric motors; Error analysis; Inductors; Loop transfer functions; Observers; Parameter uncertainty; positioning; second-order pole-zero cancellation; speed and acceleration observer; Speed control; Stators; Subsystems; Tuning; Velocity control
• ISSN: 1549-7747; 1558-3791
• DOI: 10.1109/TCSII.2023.3253059

This brief considers the speed control problem for brushless DC motors (BLDCMs) fed by a buck converter subject to the BLDCM parameter and load uncertainty. This brief makes three important contributions that distinguish it from previous results: (a) the plant model-free observer estimates the first- and second-order time derivatives for BLDCM speed by incorporating the disturbance-observing mechanism as the subsystem, (b) the proposed control law leads to the first-order closed-loop transfer function from the converter current reference to the DCM speed using observer-based active damping injection, and (c) the analytic variable feedback gain implements converter current-loop adaptation based on the size of the current error. Experimental analysis demonstrates the actual advantages of the proposed technique using a 420 W BLDCM fed by a DC/DC buck converter.