Experimental investigation of vibro-acoustic noise analysis in the switched reluctance motor through transient model-based multiphysics analysis for electric vehicles applications

The SR motor is acquiring popularity due to its dynamic characteristics such as higher power, torque, and efficiency. Even though, Vibro-acoustic noise is a significant issue in SR motors, which are caused by radial electromagnetic forces. This research adopted a novel methodology to investigate the various vibro-acoustic noise sources to enhance the performance of real-time SR motors. This methodology integrates transient model-based multiphysics and experimental analysis to predict the vibro-acoustic noise sources in SR motors. A multiphysics model incorporates not only the EM and acoustic fields, but also the structural geometry and variably distributed EM forces, to predict and analyse the EM vibro-acoustic noise in SR motor. The experimental results reveal that the maximum vibro-acoustic noise amplitudes are observed at 150, 240, 570, 920, 1210, and 1650 Hz due to uneven EM forces. To verify the presence of experimental vibro-acoustic noise levels at different frequencies, a transient model-based multiphysics analysis is investigated. The vibro-acoustic noise distribution trends seen in the simulation are consistent with those seen in the experiments. Finally, based on the simulation and experimental results revealed that EM forces, load-current changes, flux density, torque ripples are the significant reasons for greatest vibro-acoustic noise levels in the SR motor.