BLDC 전동공구의 효율향상을 위한 연구

Abstract

This paper proposes a phase advance method of brushless dc motors for the efficiency improvement. Power tools operate at high-speed and high-load. However, the current delay occurs at this operating point. To complement the disadvantage, the phase advance method is applied to existing power tools. The fixed operating point of the power tools causes low efficiency. So the proposed method find optimum operating point in accordance with the current and speed. This thesis proposes phase advance method to improve efficiency compared to existing power tools at all load and speed range.