Design and Performance Evaluation of Direct Torque and  Indirect Flux Control of BLDC Motor

C. Dinakaran; K. Bhavani; Prof. K. Eswaramma

Volume : II, Issue : VIII, August - 2013

Design and Performance Evaluation of Direct Torque and Indirect Flux Control of BLDC Motor

C. Dinakaran, K. Bhavani, Prof. K. Eswaramma

Abstract :

In this paper, the position–sensor less direct torque and indirect flux control of ushless dc (BLDC) Motor with non sinusoidal back electromotive force (EMF) has been extensively investigated. In the literature, several methods have been proposed for BLDC Motor drives to obtain optimum current and torque control with minimum torque pulsations. Most methods are complicated and do not consider the stator flux linkage control, therefore, possible high–speed operations are not feasible. In this study, a novel and simple approach to achieve a low–frequency torque ripple–free direct torque control (DTC) with maximum efficiency based on dq reference frame is presented. The proposed sensor less method closely resembles the conventional DTC scheme used for sinusoidal ac Motors such that it controls the torque directly and stator flux amplitude indirectly using d–axis current. This method does not require pulse width modulation and proportional plus integral regulators and also permits the regulation of varying signals.