An Analytical Prediction Method for Zero-Order Vibration and Noise of Permanent Magnet Synchronous Motor

Abstract

This paper accurately predicts the zero-order vibration and noise of interior permanent magnet synchronous motor (IPMSM). Initially, a specific order of radial electromagnetic (EM) force with significant vibration effects is identified, confirming the zero-order vibration as the source of vibration. To further predict this vibration, the assembly of the enclosure, stator core, windings and end covers is equivalent to a single cylindrical shell, the isotropic or orthotropic properties of each component are fully taken into account, and the composite material parameters of the shell are calculated. Subsequently, an analytical model of shell is developed to predict the zero-order vibration displacement and sound pressure level (SPL) of the motor. Furthermore, these results under no-load and rated-load conditions are validated by simulation and experiment. In addition, this analytical method is also pointed out to be suitable for the IPMSM with a spliced stator core featuring different material parameters, and a vibration reduction strategy is analyzed.