Evaluation of acoustic noise and mode frequencies with design variations of switched reluctance machines

The stator mode frequency, as well as the intensity of acoustic noise generated by magnetic radial force, is related to the geometry, configuration, and material properties of the switched reluctance machine (SRM). Two different four-phase 8/6 SRMs with similar specifications, torque-speed requirements, and envelope dimensions have been designed and built for experiments related to noise intensity and stator mode frequencies. One of these two SRMs, labeled as low-noise SRM is designed following the low-noise design guidelines. The other one, labeled as conventional SRM is designed following the conventional design methodology. The mode frequencies and noise pressure levels for both the SRMs have been calculated using the analytical models. Acoustic-noise data collected from a test bench are analyzed to correlate the experimental and theoretical results.