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http://dx.doi.org/10.5370/JEET.2013.8.2.295

Digital Implementation of PWM Techniques for Two-phase Eight-switch Inverter fed Brushless DC Motor Drives  

Lin, Hai (Department of Automation, School of Electronic and Control Engineering, Chang'an University)
You, Yong-Min (Department of Electronics, Electrical, Control and Instrumentation Engineering, Hanyang University)
Cheon, Sung-Rock (SNTech Co., Ltd.)
Kwon, Byung-Il (Department of Electronic Systems Engineering, Hanyang University)
Publication Information
Journal of Electrical Engineering and Technology / v.8, no.2, 2013 , pp. 295-303 More about this Journal
Abstract
This paper reports an investigation of pulse width modulation (PWM) techniques for two-phase brushless DC (BLDC) motors fed by a two-phase eight-switch inverter in a fan application. The three-phase BLDC motor is widely applied in industry; however, a lower-cost two-phase BLDC motor and drive circuit has been greatly in demand in recent years. In this paper, we introduce a mathematical model of the two-phase BLDC motor with sinusoidal back electromotive forces (EMFs) based on traditional three-phase BLDC motors. To simplify the drive algorithm and speed up its application, we analyze the principle of block commutation for a two-phase BLDC motor drive in the 180-electrical-degree conduction mode, and we further propose five PWM schemes to improve the commutation performance of the two-phase BLDC drive. The effectiveness of the proposed PWM methods is verified through experiments.
Keywords
Two-phase brushless DC motor; PWM technique; Inverter;
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