BLDC 전동기의 전압각 제어 기법과 제어기 이득 선정법

Abstract

This paper introduces a voltage angle controlled Space Vector Modulation (SVM) strategy for Brushless DC(BLDC) motor operation. The conventional 6-step control method for BLDC motors encounters limitations as it can only utilize half of the inverter DC link voltage(Vdc/2). SVM control is implemented to overcome inverter voltage utilization. The voltage angle controller is mainly used in flux-weaking control and has the advantage of having only one current controller. In this paper, voltage angle control is applied in the constant torque region, and the closed-loop transfer function of voltage-angle controller is analyzed according to the response of gain, speed, and load. Bode plots are used for this analysis, leading to the identification of the gain value that effectively suppresses resonance. Furthermore, the study addresses speed control by adjusting the voltage magnitude, and the proposed method is validated through simulation and experimental results.