Torque Ripple Minimization in Switched Reluctance Motors With Acoustic Noise Mitigation by Current Waveform Shaping

This article presents a novel method for torque ripple reduction in switched reluctance motors (SRMs). The proposed method relies on current waveform shaping. The shaped current profile is an adjusted version of a current waveform in the literature that reduces the acoustic noise of SRMs. The resulting proposed current flattens the torque waveform in addition to a significant reduction in acoustic noise. The proposed method is compared with several conventional square currents, as well as with the currents that are dedicated to acoustic noise reduction from the literature. The primary contributions of this article are the simultaneous minimization of torque ripple and acoustic noise through current waveform shaping, as well as the application of the current-waveform refinement method specifically for torque ripple reduction. Experiments and finite element analysis were implemented to achieve the comparisons in terms of current, torque, radial force, stator vibration, and sound pressure level.