A sensorless control method of BLDC(Brushless DC) motors using line-to-line back EMFs

선간 역기전력을 이용한 브러시리스 직류 전동기의 센서리스 제어

This paper proposes a sensorless control method of BLDC motors using line-to-line back-EMFs. Typical sensorless control methods have various problems such as the difficulty in operation at low speed and difficulties in application and so forth. However, the control method using line-to-line back-EMFs that this paper proposes solved not only such problems but also problems of noise and difficulty of commutation detection. The method is to divide line-to-line back EMF into the constant. With 550[W] BLDC motor driving system, simulations and experiments have been carried out for the verification of the proposed control method.