An Adaptive Direct Torque Control With Reconstructed Voltage Vectors for Six-Phase Switched Reluctance Motor

In the context of applying direct torque control (DTC) to switched reluctance motors (SRMs), negative torque is generated to track the demanded torque, which reduces the system efficiency. To reduce torque ripple and enhance system output efficiency, this article proposes an optimization strategy based on online adjustment of sector positions for DTC method of a six-phase SRM. First, using the magnetic characteristics and torque generation properties of DTC, a new voltage vector is designed, and phase commutation rules are reformulated to reduce the occurrence of negative torque and enhance the torque-ampere ratio. Then, an optimal torque ripple constraint algorithm is proposed, allowing for real-time adjustment of the DTC sector positions based on the prevailing operating conditions, thereby reducing the significant torque ripple during commutation and optimizing torque control. Finally, the effectiveness of the proposed approach is validated through a 12/10-pole six-phase SRM.