Bus-Clamping-Based Direct Torque Control Strategy Dedicated to B6-Inverter Fed Symmetrical Two-Phase IM Drive

The paper deals with a novel DTC strategy dedicated to B6-inverter fed two-phase induction motor (2PIM) drives. It considers a bus-clamping-based approach in the synthesis of the vector selection table, leading to the “bus-clamping DTC” (BC-DTC). The study is initiated by a presentation of the B6-inverter fed 2PIM drive and a recall of the DTC background. Then, a special attention is paid to the design of the BC-DTC vector selection tables. For the sake of comparison, a conventional DTC strategy, inspired from the Takahashi one, is also considered. A simulation-based comparison of selected steady-state features is carried out. Then, a validation of the simulation results allied to an extension of the investigation is experimentally treated. The comparison is achieved by an investigation of the drive dynamic behavior under step- and ramp-shaped reversals of the reference speed. It is shown that the BC-DTC enables reductions of the switching frequency and of the torque ripple.

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