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Development of Back-emf Filter Circuit for Driving Sensorless BLDC Motors  

Song, Doo-Young (전남대 전기공학과)
Lee, Sung-Ho (한국생산기술연구원)
Jung, Tae-Uk (경남대 전기공학과)
Cho, Su-Eog (서일대 전기공학과)
Park, Sung-Jun (전남대 전기공학과)
Kim, Dong-Ok (전남대 전기공학과 BK연구)
Publication Information
The Transactions of the Korean Institute of Power Electronics / v.13, no.1, 2008 , pp. 63-69 More about this Journal
Abstract
The position of stator is essential when a trapezoidal BLDC motor is drived. In this paper we proposed a novel sensorless drive system for the trapezoidal BLDC motor without hall sensors or encoders. The resistor Y-connecting method is used to obtain Back-emf of a trapezoidal BLDC motor. Especially, by using the new Back-emf filter circuit proposed in this paper the sensorless characteristic in low speed is improved. The prototype proposed system applied for a 100[W] rating BLDC motor is made and the propriety of the Back-EMF filter circuit is also verified.
Keywords
Back-emf filter circuit; Sensorless bldc motor; Absolute value filter circuit; Clamping circuit;
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