A Modified SRM Drive Structure Based on Conventional Inverter and DTC Strategy to Reduce Torque Ripple

This paper proposes a modified drive structure for switched reluctance motors considering a direct torque control strategy. In the proposed converter structure, standard inverter topologies are used with a few additional components to make the total SRM drive cost-effective. Like drives with conventional inverters, proposing a new general converter structure, appropriate regarding its total cost and controllability, has been one of the most critical challenges of the last two decades for switched reluctance motors. The use of such conventional three-phase inverters instead of SRM (Switched Reluctance Motor) exclusive converters, due to low cost and greater availability, has been analyzed and effectively implemented in this paper. The analysis showed that driving switched reluctance motors using conventional inverters could possibly lead to a high torque performance. In this paper, two new converter structures, based on conventional three and one phase inverters, are presented for a four-phase switched reluctance motor. In addition, the direct torque control strategy is used to reduce torque ripple sufficiently. The results showed the effectiveness of the proposed drive structure.