A study on the development of a new sensorlss drive system for the brushless DC motors

브러시리스 직류 전동기용 새로운 센서리스 드라이브 개발에 관한 연구

In this paper we proposed a new sensorless drive system for the trapezoidal type brushless DC motor which does not use any mechanical position or speed sensor and applicable to the systems requiring a constant speed and torque such as Fan. For this a novel indirect rotor position sensing technique based on a detailed analysis of the terminal voltage characteristics is proposed in this paper. And a sensorless drive system for the brushless DC motor is implemented using a 87c196mc fo the main microprocessor and a power FET for the inverter. The experimental results will show the validity of the proposed indirect sensing method and the practical use of the sensorless drive