Modified PWM-Based Deadbeat Direct Torque Control for Dual Three-Phase Permanent Magnet Synchronous Machine Drive

Dual three-phase electric machine has been attracting increasing interest during the past decades, for its advantages in power segmentation, lower torque pulsations and so on. The conventional switching-table-based direct torque control of dual three-phase permanent magnet synchronous machine drives suffers from large harmonic currents, torque ripple and variable switching frequency. Therefore, a modified deadbeat direct torque control strategy based on space-vector PWM technique is proposed to cope with the aforementioned issues. A simple proportional-integral controller and a dead-time compensator are employed for the further reduction of harmonic currents. The experimental results confirm the effectiveness of the proposed strategy.