Browsing by Author "Kan, Kai-Sheng"

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Adaptive Soft Starting Method with Current Limit Strategy for Sensorless BLDC Motors
(2012)
Kan, Kai-Sheng
;
Tzou, Ying-Yu
;
電控工程研究所
;
Institute of Electrical and Control Engineering
This paper proposes an adaptive soft start-up strategy for sensorless control of three-phase BLDC motors in applications to consumer electronics and high efficiency cooling fans. The proposed start-up control scheme combines a closed-loop I/ Hz control with adaptive ramping current profile in accordance to different load torque-speed characteristic. The proposed start-up scheme can reduce the start-up current while at the same time provides a robust and smooth start-up for different applications. A synchronous current sampling control scheme based on the dc-link current is developed for the regulation of motor phase current. A start-up current limit profile is calculated based on assumed load torque-speed characteristics. The controller will switch to sensorless control mode once a verified sensorless commutation signal is detected. Simulation and experimental results have been given to show the robustness of the proposed sensorless start-up control scheme.