• S.Sivaganesan
• S. Radha Krsihna Reddy
• C.Somasankarappa

Brushless dc motor still suffers from commutation torque ripple, which mainly depends on speed and transient line current in the commutation interval. This paper presents a novel circuit topology and a dc link voltage control strategy to keep incoming and outgoing phase currents changing at the same rate during commutation. A dc–dc single-ended primary inductor converter (SEPIC) and a switch selection circuit are employed in front of the inverter. The desired commutation voltage is accomplished by the SEPIC converter. The dc link voltage control strategy is carried out by the switch selection circuit to separate two procedures, adjusting the SEPIC converter and regulating speed. The cause of commutation ripple is analysed, and the way to obtain the desired dc link voltage is introduced in detail. Finally, simulation and experimental results show that, compared with the dc–dc converter, the proposed method can obtain the desired voltage much faster and minimize commutation torque ripple more efficiently at both high and low speeds and the closed loop control is achieved by Fuzzy logic control.

Brushless dc motor (BLDCM), commutation, dc link voltage control, single-ended primary inductor converter (SEPIC).

"Dropping Commutation Torque Ripple & Fuzzy logic control for Brushless DC Motor Based on SEPIC Converter", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.5, Issue 4, page no.71-76, April-2018, Available :http://www.jetir.org/papers/JETIR1804236.pdf

"Dropping Commutation Torque Ripple & Fuzzy logic control for Brushless DC Motor Based on SEPIC Converter", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.5, Issue 4, page no. pp71-76, April-2018, Available at : http://www.jetir.org/papers/JETIR1804236.pdf