This paper exhibits a proportional-type robust current controller for permanent magnet synchronous motors (PMSMs), incorporating the variable bandwidth technique driven by the proposed online auto-tuner and the disturbance observer (DOB) as the subsystems. There are two contributions: (a) the proposed online auto-tuner implements the variable bandwidth for the closed-loop system to boost the transient current tracking performance and (b) the combination of proportional-type feedback controller and DOB eliminates the requirement of the integral action, ensuring the steady-state error rejection property. Moreover, it is proved that the resultant feedback system recovers the target current tracking performance without steady-state errors. The experimental study is conducted to verify the efficacy of the proposed controller using a 700-W prototype PMSM.
Keywords: Auto-tuner; Current control; Disturbance observer; Parameter uncertainty; Permanent magnet synchronous motors.
© 2024. The Author(s).