Comparison of 12/8 and 6/4 Switched Reluctance Motor: Noise and Vibration Aspects

This paper compares and investigates the vibration and noise characteristics through simulations and experiments of 12/8 and 6/4 switched reluctance motors (SRMs). The radial force which is the main source of vibration is computed from two-dimensional (2D) transient magnetic finite-element analysis (FEA) and compared in both time and frequency domains. At the same output power, the radial force of 6/4 SRM is found to be more than two times as that of 12/8 SRM. Three-dimensional structural finite-element analysis (3D FEA) is used to study the mechanical characteristics. It can be concluded from static structural analysis that the maximum total deformation could be reduced to 1/26 if the motor is designed with 12/8 structure instead of 6/4. The dominant vibration modes are verified by modal analysis and stationary test. It is also found that the vibration and noise are dramatically reduced for 12/8 SRM during experiments.