Investigation on the Vibration of a 3-Phase SRM Analysis

This paper presents the determination of natural frequency of vibration for a 1 kW, 48 V, 3000 RPM, 3-phase Switched Reluctance Motor set-up and experimental validation of the same. Vibration, audible noise and torque ripple being some of the disadvantages that hold back the SRM from gaining absolute popularity hence, this study is significant. The deformed shape and the natural modes of vibration are obtained from FEM-based static-structural and modal-analysis simulations, respectively. Dominant natural modes have been identified by comparing the deformed shape of the stator under normal operation and the mode shapes for the different frequencies. Analysis of the accelerometer signals in the frequency domain leads to the experimental identification of the dominant frequency causing vibration. Static excitation test has also been done for diagnosing peak noise in the same frequency range as obtained from other experiments. The dominant natural mode is thus identified and is found to be remarkably close to FEM-simulation prediction.