Position Sensorless Direct Torque Control of Brushless DC Motor Drive Using Four-Switch, Three Phase Inverter

Abstract

Today, cost reduction is important matter in all of the systems. In brushless dc (BLDC) motor drives, cost reduction can be achieved by elimination of three Hall Effect position sensors and reducing the number of power switches. On the other hand, in order to reduce the torque ripple, direct torque control (DTC) method can directly control the inverter states. To utilize simultaneous both advantages, reduction cost and minimization torque ripple, we proposed a novel reduced-part position sensorless DTC technique for a four-switch, three-phase BLDC motor drive in the constant torque region. The performance of the proposed scheme is verified via some simulations.