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Improved switching method for sensorless BLDC motor drive  

Lee, Ho-Hyoung (광운대학교 제어계측공학과)
Cho, Whang (광운대학교 정보제어공학과)
Lee, Key-Seo (광운대학교 정보제어공학과)
Publication Information
The Journal of the Korea institute of electronic communication sciences / v.5, no.2, 2010 , pp. 164-170 More about this Journal
Abstract
In brushless DC motor, current flow should be controlled such that only properly selected 2 out of 3 phases carry current depending on the position of rotor. In order to detect position of rotor, hole sensor, encoder, optical position-detecting sensor, and magnetic position-detecting sensor are frequently employed. These sensors not only often cause malfunction in low and high temperature but they also have disadvantage of increasing cost and size of an motor system. To reduce the cost and size and to increase the robustness of the motor system, recently researches on sensorless motor dirve are very active. This paper proposes a novel unipolar PWM switching method that can improve the control problem caused by the difficulty of detecting zero crossing point at high revolution speed by minimizing the switching noise while increasing the lifespan of the drive system.
Keywords
Brushless Motor; Sensorless; Unipolar PWM; Bipolar PWM; Zero Crossing; Improved Unipolar PWM;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
연도 인용수 순위
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