Direct Instantaneous Torque Control of Switched Reluctance Machines for Low Torque Ripple Regenerative Braking

With the increasing interest for Switched Reluctance Machines (SRM) due to its low cost and fault tolerance, developing torque ripple minimization techniques for SRM has been one of the main objectives in these machine drives. Indeed many techniques have already been developed for motoring mode SRM. However, few research investigate torque ripple minimization in generating/braking mode. This paper proposes a Direct Instantaneous Torque Control for generating/braking mode SRM. The proposed method seeks maximum efficiency while maintaining the torque ripple to a practical minimum. The proposed system was validated in simulation and experimentally. In simulation, a torque ripple of 11.2% is achieved at 60rad/s and -3.1N.m load torque was achieved. In the experimental validation, the torque ripple was approximately 19% in generating mode at 41.86rad/s (400rpm). The result enables regenerative braking operation for low torque ripple applications, such as aerospace and electric vehicles.