Online compensation for torque ripple reduction in SRM drives

Torque ripple is an inherent disadvantage that inhibits the usability of Switched Reluctance Motors (SRM) in industrial and automotive applications. Torque Sharing Function (TSF) is a promising strategy for the torque ripple reduction in SRM drives. The major bottle-neck of TSF based methods is that the actual phase current fails to track the reference current generated by the TSF controller during the demagnetization of each phase. This current tracking error will result in torque ripple. An online compensation technique is proposed in this paper to compensate this torque ripple. The effectiveness of the proposed compensation technique is established through simulation results. A study on the impact of TSF based methods on the stator radial force, which is the key source of structure-borne noise in SRM, is also presented in this paper.