Abstract
In medium and high power applications, the BLDC motor is associated to multi-level inverters particularly the three levels NPC topology (B12). To improve the torque performance of the B12-inverter fed BLDC motor drives, this paper deals with the synthesis and performance analysis of three control strategies, namely: (i) DCC strategy with current controlled, (ii) DTC1 strategy, with torque controlled, inspired from the one developed by Takahashi in induction motor drives and (ii) DTC2 strategy that eliminates the torque dips penalizing DTC1. Simulation results, carried out considering low and high reference motor speeds, prove the high performance exhibited by the proposed DTC2 strategy which exhibits a remarkable reduction of the torque ripple and a low distortion in the line currents.
