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Novel back-EMF detection technique of brushless DC motor drives for whole duty-ratio range control

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3 Author(s)
Yen-Shin Lai ; Dept. of Electr. Eng., Nat. Taipei Univ. of Technol., Taiwan ; Fu-Shan Shyu ; Wei-Hwa Rao,

The main theme of this paper is to present a novel back-EMF detection technique which provides whole duty-ratio range control for brushless DC motor (BLDCM) drives. The problems for previous back-EMF detection techniques are clearly explained first. It will be shown that these techniques can be used either for low duty-ratio control or for high duty-ratio control only. The proposed technique deals with the above-mentioned problem to give a whale duty-ratio control while nor invoking any position and current sensors. Experimental results derived from an FPGA-based BLDCM for air-conditioner applications demonstrate that the presented technique works well from standstill to closed-loop operation, extreme low duty ratio, e.g. 1%, and extreme high duty ratio control, e.g. 100%.

Published in:

Industrial Electronics Society, 2004. IECON 2004. 30th Annual Conference of IEEE  (Volume:3 )

Date of Conference:

2-6 Nov. 2004